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Li H, Di J, Dong Y, Bao S, Fu S. Enhanced reduction of sulfate by iron-carbon microelectrolysis: interaction mechanism between microelectrolysis and microorganisms. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024:10.1007/s11356-024-32993-9. [PMID: 38635092 DOI: 10.1007/s11356-024-32993-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 03/15/2024] [Indexed: 04/19/2024]
Abstract
Sulfate wastewater has a wide range of sources and greatly harms water, soil, and plants. Iron-carbon microelectrolysis (IC-ME) is a potentially sustainable strategy to improve the treatment of sulfate (SO42-) wastewater by sulfate-reducing bacteria (SRB). In this study, an iron-carbon mixed micro-electrolysis bioreactor (R1), iron-carbon layered bioreactor (R2), activated carbon bioreactor (R3), and scrap iron filing bioreactor (R4) were constructed by up-flow column experimental device. The performance and mechanism of removing high-concentration sulfate wastewater under different sulfate concentrations, hydraulic retention times (HRT), and chemical oxygen demand (COD)/SO42- were discussed. The results show that the iron-carbon microelectrolysis-enhanced SRB technology can remove high-concentration sulfate wastewater, and the system can still operate normally at low pH. In the high hydraulic loading stage (HRT = 12 h, COD/SO42- = 1.4), the SO42- removal rate of the R1 reactor reached 98.08%, and the ORP value was stable between - 350 and - 450 mV, providing a good ORP environment for SRB. When HRT = 12 h and influent COD/SO42- = 1.4, the R1 reactor sulfate removal rate reached 96.7%. When the influent COD/SO42- = 0.7, the sulfate removal rate was 52.9%, higher than the control group. Biological community analysis showed that the abundance of SRB in the R1 reactor was higher than that in the other three groups, indicating that the IC-ME bioreactor could promote the enrichment of SRB and improve its population competitive advantage. It can be seen that the synergistic effect between IC-ME and biology plays a vital role in the treatment of high-concentration sulfate wastewater and improves the biodegradability of sulfate. It is a promising process for treating high-concentration sulfate wastewater.
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Affiliation(s)
- Hanzhe Li
- College of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China
| | - Junzhen Di
- College of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China.
| | - Yanrong Dong
- College of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China
| | - Sihang Bao
- College of Mining, Liaoning Technical University, Fuxin, 123000, China
| | - Saiou Fu
- College of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China
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Zhao J, Liu H, Chen W, Jian Y, Zeng G, Wang Z. Hydrogel of HEMA, NVP, and Morpholine-Derivative Copolymer for Sulfate Ion Adsorption: Behaviors and Mechanisms. Molecules 2023; 28:molecules28030984. [PMID: 36770649 PMCID: PMC9923838 DOI: 10.3390/molecules28030984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 12/24/2022] [Accepted: 01/09/2023] [Indexed: 01/21/2023] Open
Abstract
SO42--containing compounds are widely present in wastewater generated from various industries and mining industries, such as slag leachate, pulp and paper wastewater, modified starch wastewater, etc. When the concentration of SO42- is too high, it will not only be corrosive to metal equipment but also accumulate in the environmental media. Based on this, a novel cationic hydrogel HNM was synthesized in this study by introducing morpholine groups into the conventional hydrogel HEMA-NVP system for the adsorption of SO42- in aqueous solutions. Characterizations by Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) indicated that morpholine groups had been introduced into the as-synthesizedhydrogels. The scanning electron microscope (SEM) characterization results show that the introduction of morpholine groups changed the surface of the hydrogel from micron-scale wrinkles to nanoscale gaps, increasing the contact area with the solution. The results of static water contact angle (WCA), equilibrium water content (EWC), and SO42- adsorption capacity show that the introduction of morpholine groups not only further improved the equilibrium water content and hydrophilicity of the hydrogel but also greatly improved the SO42- adsorption capacity of the hydrogel, with the maximum SO42- adsorption amount of 21.59 mg/g, which was much higher than that of the hydrogel without morpholine groups of 5.15 mg/g. Further studies found that the adsorption of SO42- on the hydrogel HNM was pH-dependent, and acidic conditions were favorable for the adsorption. Therefore, the introduction of morpholine groups greatly enhanced the ability of conventional HEMA-NVP hydrogels to remove SO42- from aqueous solutions.
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Affiliation(s)
- Jing Zhao
- Laboratory of Organic Solid Waste Treatment and Recycling, College of Materials Science and Engineering, Henan Institute of Technology, Xinxiang 453003, China
| | - Haitao Liu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
- Correspondence: (H.L.); (Y.J.); (Z.W.)
| | - Wenwen Chen
- Department of Chemistry, Lishui University, Lishui 323000, China
| | - Yu Jian
- Department of Chemistry, Lishui University, Lishui 323000, China
- Correspondence: (H.L.); (Y.J.); (Z.W.)
| | - Guoyong Zeng
- Department of Chemistry, Lishui University, Lishui 323000, China
| | - Zhenyu Wang
- Department of Environmental Engineering, College of Ecology, Lishui University, Lishui 323000, China
- Correspondence: (H.L.); (Y.J.); (Z.W.)
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Barral N, Maleki M, Madani N, Cánovas M, Husillos R, Castillo E. Spatio-temporal geostatistical modelling of sulphate concentration in the area of the Reocín Mine (Spain) as an indicator of water quality. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:86077-86091. [PMID: 34523103 DOI: 10.1007/s11356-021-16475-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 09/06/2021] [Indexed: 06/13/2023]
Abstract
Water stored in open-pit lakes can be a water resource when the mine is closed. This study aimed to develop a reliable model to evaluate the water quality, based on the sulphate concentration, in the Reocín Mine area (Spain) by using geostatistical algorithms. To this end, water samples were taken from the beginning of the flooding period in November 2004 until August 2020. The model showed that the sulphate concentration was highest between February 2009 and February 2012 and decreased as the flooding process progressed. The area with the highest concentration (2000 mg L-1) was the central part of the study area, where the mine is located, while in the northeast and southwest, the values from the beginning of the flooding period were lower, below 500 mg L-1. In the last obtained model, the values decreased considerably to 1300 mg L-1 in the central area and below 250 mg L-1 in the northeast and southwest areas. The modelling conducted to assess the water quality in the area of influence of the mine determined that the flooding process has little influence on the water in the rivers and streams in the area, since the sulphate concentration measured in the adjacent rivers and streams was less than 250 mg L-1, indicating that anomalous concentrations were only found in the open-pit area. It was shown that geostatistical algorithms are useful tools that can be used to model the intensity and extension of water pollutants in space over time.
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Affiliation(s)
- Noemí Barral
- Transport and Project and Process Technology Department, Universidad de Cantabria, Santander, Spain
| | - Mohammad Maleki
- Department of Metallurgical and Mining Engineering, Universidad Católica del Norte, Antofagasta, Chile.
| | - Nasser Madani
- School of Mining and Geosciences, Nazarbayev University, Nur-Sultan, Kazakhstan
| | - Manuel Cánovas
- Department of Metallurgical and Mining Engineering, Universidad Católica del Norte, Antofagasta, Chile
| | - Raúl Husillos
- Transport and Project and Process Technology Department, Universidad de Cantabria, Santander, Spain
| | - Elena Castillo
- Geographic Engineering and Graphic Expression Techniques Department, Universidad de Cantabria, Santander, Spain
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Chibani A, Ncib S, Barhoumi A, Bouguerra W, Elaloui E. Box-Behnken design optimization of sulfate reduction from natural water by electrocoagulation process. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2022.2134372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Amel Chibani
- Department of Chemistry, Faculty of Sciences of Gafsa, Sidi Ahmed Zarroug, Gafsa, Tunisia
| | - Sana Ncib
- Laboratory of Materials Application to Water, Environment and Energy (LAM3E), (LR21ES15), Faculty of Sciences of Gafsa, University of Gafsa, Gafsa, Tunisia
| | - Afef Barhoumi
- Laboratory of Materials Application to Water, Environment and Energy (LAM3E), (LR21ES15), Faculty of Sciences of Gafsa, University of Gafsa, Gafsa, Tunisia
| | - Wided Bouguerra
- Department of Chemistry, Faculty of Sciences of Gafsa, Sidi Ahmed Zarroug, Gafsa, Tunisia
- Laboratory of Materials Application to Water, Environment and Energy (LAM3E), (LR21ES15), Faculty of Sciences of Gafsa, University of Gafsa, Gafsa, Tunisia
| | - Elimame Elaloui
- Department of Chemistry, Faculty of Sciences of Gafsa, Sidi Ahmed Zarroug, Gafsa, Tunisia
- Laboratory of Materials Application to Water, Environment and Energy (LAM3E), (LR21ES15), Faculty of Sciences of Gafsa, University of Gafsa, Gafsa, Tunisia
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5
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Studies towards the adsorption of Sulphate Ions from Acid Mine Drainage by modified Attapulgite clays. SOUTH AFRICAN JOURNAL OF CHEMICAL ENGINEERING 2022. [DOI: 10.1016/j.sajce.2022.08.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Xie B, Zhou C, Chen J, Huang X, Zhang J. Preparation of microbubbles with the generation of Dean vortices in a porous membrane. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2021.117105] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kang JS, Seong J, Yoo J, Kim P, Park K, Lee J, Cheon J, Kim H, Lee S. Applicability of a Combined DAF-MF Process to Respond to Changes in Reservoir Water Quality through a Two-Year Pilot Plant Operation. MEMBRANES 2021; 11:membranes11120964. [PMID: 34940465 PMCID: PMC8707207 DOI: 10.3390/membranes11120964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/30/2021] [Accepted: 12/03/2021] [Indexed: 11/16/2022]
Abstract
The optimal operating conditions of a combined dissolved air flotation (DAF)-microfiltration (MF) process to respond to changes in raw water quality were investigated by operating a pilot plant for two years. Without DAF pre-treatment (i.e., MF alone), MF operated stably with a transmembrane pressure (TMP) increase of 0.24 kPa/d when the turbidity of raw water was low and stable (max. 13.4 NTU). However, as the raw water quality deteriorated (max. 76.9 NTU), the rate of TMP increase reached 43.5 kPa/d. When DAF pre-treatment was applied (i.e., the combined DAF-MF process), the MF process operated somewhat stably; however, the rate of TMP increase was relatively high (i.e., 0.64 kPa/d). Residual coagulants and small flocs were not efficiently separated by the DAF process, exacerbating membrane fouling. Based on the particle count analysis of the DAF effluent, the DAF process was optimised based on the coagulant dose and hydraulic loading rate. After optimisation, the rate of TMP increase for the MF process stabilised at 0.17 kPa/d. This study demonstrates that the combined DAF-MF process responded well to substantial changes in raw water quality. In addition, it was suggested that the DAF process must be optimised to avoid excessive membrane fouling.
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Affiliation(s)
- Joon-seok Kang
- Graduate School of Water Resources, Sungkyunkwan University, Suwon 16149, Korea; (J.-s.K.); (J.S.); (J.Y.); (P.K.); (K.P.)
| | - Jayeong Seong
- Graduate School of Water Resources, Sungkyunkwan University, Suwon 16149, Korea; (J.-s.K.); (J.S.); (J.Y.); (P.K.); (K.P.)
| | - Jewan Yoo
- Graduate School of Water Resources, Sungkyunkwan University, Suwon 16149, Korea; (J.-s.K.); (J.S.); (J.Y.); (P.K.); (K.P.)
| | - Pooreum Kim
- Graduate School of Water Resources, Sungkyunkwan University, Suwon 16149, Korea; (J.-s.K.); (J.S.); (J.Y.); (P.K.); (K.P.)
| | - Kitae Park
- Graduate School of Water Resources, Sungkyunkwan University, Suwon 16149, Korea; (J.-s.K.); (J.S.); (J.Y.); (P.K.); (K.P.)
| | - Jaekyu Lee
- Toray Advanced Materials Korea Inc., Seoul 07790, Korea; (J.L.); (J.C.)
| | - Jihoon Cheon
- Toray Advanced Materials Korea Inc., Seoul 07790, Korea; (J.L.); (J.C.)
| | - Hyungsoo Kim
- Graduate School of Water Resources, Sungkyunkwan University, Suwon 16149, Korea; (J.-s.K.); (J.S.); (J.Y.); (P.K.); (K.P.)
- Correspondence: (H.K.); (S.L.); Tel.: +82-31-290-7520 (H.K.); +82-31-290-7542 (S.L.)
| | - Sangyoup Lee
- Graduate School of Water Resources, Sungkyunkwan University, Suwon 16149, Korea; (J.-s.K.); (J.S.); (J.Y.); (P.K.); (K.P.)
- Correspondence: (H.K.); (S.L.); Tel.: +82-31-290-7520 (H.K.); +82-31-290-7542 (S.L.)
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Kumar PS, Gayathri R, Rathi BS. A review on adsorptive separation of toxic metals from aquatic system using biochar produced from agro-waste. CHEMOSPHERE 2021; 285:131438. [PMID: 34252804 DOI: 10.1016/j.chemosphere.2021.131438] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/29/2021] [Accepted: 07/02/2021] [Indexed: 06/13/2023]
Abstract
Water is a basic and significant asset for living beings. Water assets are progressively diminishing due to huge populace development, industrial activities, urbanization and rural exercises. Few heavy metals include zinc, copper, lead, nickel, cadmium and so forth can easily transfer into the water system either direct or indirect activities of electroplating, mining, tannery, painting, fertilizer industries and so forth. The different treatment techniques have been utilized to eliminate the heavy metals from aquatic system, which includes coagulation/flocculation, precipitation, membrane filtration, oxidation, flotation, ion exchange, photo catalysis and adsorption. The adsorption technique is a better option than other techniques because it can eliminate heavy metals even at lower metal ions concentration, simplicity and better regeneration behavior. Agricultural wastes are low-cost biosorbent and typically containing cellulose have the ability to absorb a variety of contaminants. It is important to note that almost all agro wastes are no longer used in their original form but are instead processed in a variety of techniques to improve the adsorption capacity of the substance. The wide range of adsorption capacities for agro waste materials were observed and almost more than 99% removal of toxic pollutants from aquatic systems were achieved using modified agro-waste materials. The present review aims at the water pollution due to heavy metals, as well as various heavy metal removal treatment procedures. The primary objectives of this research is to include an overview of adsorption and various agriculture based adsorbents and its comparison in heavy metal removal.
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Affiliation(s)
- P Senthil Kumar
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, India.
| | - R Gayathri
- Tamilnadu Pollution Control Board, Guindy, Chennai, 600032, India
| | - B Senthil Rathi
- Department of Chemical Engineering, St. Joseph's College of Engineering, Chennai, 600119, India
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Tian K, Hu L, Li L, Zheng Q, Xin Y, Zhang G. Recent advances in persulfate-based advanced oxidation processes for organic wastewater treatment. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.12.042] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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10
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Treatment of real industrial wastewater with high sulfate concentrations using modified Jordanian kaolin sorbent: batch and modelling studies. Heliyon 2021; 7:e08351. [PMID: 34825080 PMCID: PMC8605197 DOI: 10.1016/j.heliyon.2021.e08351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 10/25/2021] [Accepted: 11/05/2021] [Indexed: 11/28/2022] Open
Abstract
In the present study, BaCl2 modified Jordanian kaolin sorbent (obtained from Mahis, Jordan) was used to remove sulfate-contaminated industrial wastewater. The kaolin sample was pretreated to enhance its adsorption capacity and then characterized using X-Ray fluorescence (XRF) and Fourier Transform Infrared Spectroscopy (FTIR). Equilibrium isotherms for the adsorption parameters were carried out experimentally, and the adsorption data correlated very well with Freundlich and Temkin and Dubinin-Radushkevich models. Furthermore, the adsorption kinetics followed the pseudo-first-order and intraparticle diffusion models perfectly. The estimated value of the maximum adsorption capacity qm = 85.08 mg/g indicates that kaolin has a very high capacity to adsorb sulfate ions at studied parameters. The estimated value of the mean free energy (4.87 kJ/mol) is very low, confirming physical type adsorption. The study results established that modified Jordanian kaolin could serve as a safe and effective natural adsorbent for sulfate-contaminated industrial wastewater.
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11
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Removal of Fe(III), Cd(II), and Zn(II) as Hydroxides by Precipitation–Flotation System. SUSTAINABILITY 2021. [DOI: 10.3390/su132111913] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this paper, a combined precipitation–flotation system is proposed for the removal of Fe(III), Zn(II), and Cd(II) as hydroxides. The efficiency of precipitation, as a function of pH, metal ion concentration, and dosage of the precipitating agent as the main variables, was evaluated. The results showed that 99% efficiency was attained from a mixture solution containing the three metal ions in sulfate media at pH 10.3 after 15 min of treatment. The sedimentation behavior showed that a larger precipitate facilitated solid/liquid separation at 30 min. The characterization of precipitates was performed by X-ray diffraction (XRD) identifying iron, zinc, and cadmium oxides; hydroxides; and sodium sulfate. For the flotation, a 20 mg/L solution of dodecylamine (DDA) was used as a collector. Such a solution allowed for the removal of 76% of precipitates in concentrate. An increase in the collector concentration diminished the float percentage due to the micelle formation and low adsorption of the collector on the surface of the precipitate. The results provide evidence of the effectivity of the removal of metal ions by the combined precipitation–flotation system as an alternative for the treatment of acid mine drainage (AMD) in less time in comparison with a sedimentation stage.
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Rulyov N, Sadovskiy D, Rulyova N, Filippov L. Column flotation of fine glass beads enhanced by their prior heteroaggregation with microbubbles. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126398] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Lin MZ, Li WX, Hu T, Bu H, Li ZL, Wu T, Wu XX, Sun C, Li Y, Jiang GB. One-step removal of harmful algal blooms by dual-functional flocculant based on self-branched chitosan integrated with flotation function. Carbohydr Polym 2021; 259:117710. [PMID: 33673989 DOI: 10.1016/j.carbpol.2021.117710] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 01/06/2021] [Accepted: 01/23/2021] [Indexed: 01/21/2023]
Abstract
Harmful algal blooms induce severe environmental problems. It is challenging to remove algae by the current available treatments involving complicate process and costly instruments. Here, we developed a CaO2@PEG-loaded water-soluble self-branched chitosan (CP-SBC) system, which can remove algae from water in one-step without additional instrumentation. This approach utilizes a novel flocculant (self-branched chitosan) integrated with flotation function (induced by CaO2@PEG). CP-SBC exhibited better flocculation performance than commercial flocculants, which is attributed to the enhanced bridging and sweeping effect of branched chitosan. CP-SBC demonstrated outstanding biocompatibility, which was verified by zebrafish test and algae activity test. CaO2@PEG-loaded self-branched chitosan can serve as an "Air flotation system" to spontaneous float the flocs after flocculation by sustainably released O2. Furthermore, CP-SBC can improve water quality through minimizing dissolved oxygen depletion and reducing total phosphorus concentrations.
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Affiliation(s)
- Min-Zhao Lin
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
| | - Wei-Xiong Li
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
| | - Tian Hu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
| | - Huaitian Bu
- Department of Materials and Nanotechnology, SINTEF Industry, Forskningsveien 1, Oslo, 0373, Norway
| | - Zeng-Lin Li
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
| | - Tianfu Wu
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Xia-Xiao Wu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
| | - Chao Sun
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China
| | - Yongtao Li
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China.
| | - Gang-Biao Jiang
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China.
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Oyewo OA, Boshielo A, Adeniyi A, Onyango MS. Evaluation of the efficiency of nanoadsorbent derived from orange peels in the removal of cerium from aqueous solution. PARTICULATE SCIENCE AND TECHNOLOGY 2021. [DOI: 10.1080/02726351.2019.1658666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Opeyemi A. Oyewo
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa
| | - Amanda Boshielo
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa
| | - Amos Adeniyi
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa
| | - Maurice S. Onyango
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa
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15
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Liang YQ, Li H, Mao XM, Li Y, Wang CX, Jin LY, Zhao LJ. Competitive Adsorption of Methylene Blue and Cu(II) onto Magnetic Graphene Oxide/Alginate Beads. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2020. [DOI: 10.1134/s0036024420120158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Metal oxide-cellulose nanocomposites for the removal of toxic metals and dyes from wastewater. Int J Biol Macromol 2020; 164:2477-2496. [DOI: 10.1016/j.ijbiomac.2020.08.074] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 08/07/2020] [Accepted: 08/07/2020] [Indexed: 02/07/2023]
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17
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Şekerci K, Tuna MC. High Pressure Conduit: A Good Alternative to the Air Compressors Used in the Flotation Process. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2020. [DOI: 10.1007/s13369-020-05120-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sulphate Removal from Flotation Process Water Using Ion-Exchange Resin Column System. MINERALS 2020. [DOI: 10.3390/min10080655] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Water chemistry is one of the most important parameters affecting flotation performance. Various types of ions can dissolve and accumulate in process water depending on ore mineralogy, reagent scheme, grinding medium and chemistry of mine site water. Sulfur-based ions (sulfate, thiosulfate, polythionate) are generally observed in flotation of sulfide ores. High concentrations of these ions may reduce efficiency of the flotation process, causing scale problems. Removal of these ions from process water often requires complex water treatment plants with high capital and operating costs. In this study, partial cleaning of water was investigated as an alternative approach for decreasing high sulphate concentrations of 3000–3800 mg/L down to 1000–1500 mg/L, an acceptable concentration for most sulfide ore flotation plants, by using an ion-exchange resin. For this purpose, detailed adsorption tests were performed using a laboratory-scale column system to determine the most suitable type of resin for adsorption of sulfate and thiosalts, kinetics of adsorption and regeneration of the resins. A strong base anion ion exchange resin (Selion SBA2000) was used in the experiments. The findings from the laboratory scale studies were validated in a Cu-Pb-Zn Flotation Plant in an Iberian mine using a larger scale of column set-up. The results showed that 60–70% of sulphates could be successfully removed from process water. Adsorption capacity of the resin was determined as 80.3 mg SO4/g resin. Concentrations of thiosalts and polythionates were also reduced to nearly zero value from 500 mg/L and 1000 mg/L, respectively. Flowrate of water had a significant effect on adsorption performance. The resin could be regenerated successfully using 2% (w/v) NaOH solution and used multiple times for water treatment.
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Silva RDR, Rodrigues RT, Azevedo AC, Rubio J. Calcium and magnesium ion removal from water feeding a steam generator by chemical precipitation and flotation with micro and nanobubbles. ENVIRONMENTAL TECHNOLOGY 2020; 41:2210-2218. [PMID: 30556791 DOI: 10.1080/09593330.2018.1558288] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 12/05/2018] [Indexed: 06/09/2023]
Abstract
This work summarises the results of calcium and magnesium ion removal from raw water feeding an industrial steam generation system. The cations were precipitated with sodium phosphate before separation of the solids by dissolved air flotation, with micro and nanobubbles. Studies were done at bench scale and validated at pilot scale (raw water feed = 1 m3 h-1; air-to-solids ratio = 0.046 mg of air mg-1 of solids; residence time = 11 min). Results indicated that chemical precipitation followed by flotation significantly improved the quality of the boiler water. Best results were obtained after precipitating the cations with 50 mg L-1 of sodium phosphate at pH 11.5 and flotation with a saturation pressure (P sat) of 4 bar, a recycling ratio of 30% and a sodium oleate concentration of 20 mg L-1 as an hydrophobizing reagent. The latter assisted the adhesion of the nanobubbles (100-500 nm) generated at 4 bar with a numeric concentration of about 2.5 × 108 NBs mL-1. At pilot scale, the total hardness in the solution decreased by 80%; the residual calcium and phosphate ion concentrations were 12 and 2 mg L-1 respectively. This cell was designed including lamellae and perforate plate to improve the superficial loading capacity (up to 9 m h-1). The results were explained by chemical and interfacial phenomena and it is believed that this technique has great potential in water softening processes.
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Affiliation(s)
- R D R Silva
- Laboratório de Tecnologia Mineral e Ambiental (LTM), PPGE3M, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS - Brazil
| | - R T Rodrigues
- Departamento de Engenharia de Minas, PPGE3M, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS - Brazil
| | - A C Azevedo
- Laboratório de Tecnologia Mineral e Ambiental (LTM), PPGE3M, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS - Brazil
| | - J Rubio
- Laboratório de Tecnologia Mineral e Ambiental (LTM), PPGE3M, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS - Brazil
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Ao H, Cao W, Hong Y, Wu J, Wei L. Adsorption of sulfate ion from water by zirconium oxide-modified biochar derived from pomelo peel. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 708:135092. [PMID: 31806309 DOI: 10.1016/j.scitotenv.2019.135092] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 10/15/2019] [Accepted: 10/19/2019] [Indexed: 06/10/2023]
Abstract
Zirconium oxide-modified pomelo peel biochar (ZrBC) was synthesized for the adsorption of sulfate ion from aqueous solution. Zirconyl chloride octahydrate (ZCO) was used to modify pomelo peel biochar into ZrBC. The optimal dose of ZCO for modification is 0.5 mol/L, at which ZrBC shows the highest adsorption of sulfate ion. The adsorbents were characterized by the field emission scanning electron microscopy, X-ray photoelectron spectroscopy and surface area measurement. The results confirm that the presence of zirconium oxides and hydroxide groups on the ZrBC surface, and ZrBC has a porous structure and a higher specific surface area in comparison with pomelo peel biochar. ZrBC shows good affinity for sulfate ion with a maximum sulfate adsorption capacity of 35.21 mg/g, which is much higher than that of pomelo peel biochar (1.02 mg/g). The adsorption of sulfate on ZrBC is pH dependent, and acidic conditions favor the adsorption. The adsorption can reach near-equilibrium in approximately 120 min. The adsorption kinetics and isotherm follow the pseudo second-order equation and Langmuir adsorption model, respectively. Furthermore, nitrate and fluoride anions exhibit little influence on the adsorption of sulfate by ZrBC, whereas phosphate inhibits the adsorption under the same concentration conditions. ZrBC has the potential to be used for removal of sulfate from aqueous solution.
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Affiliation(s)
- Hanting Ao
- College of Civil Engineering, Huaqiao University, Xiamen 361021, China
| | - Wei Cao
- College of Civil Engineering, Huaqiao University, Xiamen 361021, China.
| | - Yixia Hong
- College of Civil Engineering, Huaqiao University, Xiamen 361021, China
| | - Jun Wu
- College of Civil Engineering, Huaqiao University, Xiamen 361021, China
| | - Lin Wei
- College of Civil Engineering, Huaqiao University, Xiamen 361021, China
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Xiao W, Zhao Y, Yang J, Ren Y, Yang W, Huang X, Zhang L. Effect of Sodium Oleate on the Adsorption Morphology and Mechanism of Nanobubbles on the Mica Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9239-9245. [PMID: 31268336 DOI: 10.1021/acs.langmuir.9b01384] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nanobubbles promote the flotation of fine-grained minerals. In the associated mechanism, the aggregation of fine particles is first promoted, which increases the probability of collision between particles and bubbles. However, the interaction between nanobubbles and mineral particles is often neglected, especially when the surface properties of the nanobubbles are modified by flotation collectors. In this study, the interaction mechanism between nanobubbles and the mica surface is investigated by nanoparticle tracking analysis, zeta potential measurement, and atomic force microscopy. The results reveal that the hydrophobic group of sodium oleate points toward the inside of the nanobubble and the hydrophilic group faces outward after the interaction of sodium oleate molecules and nanobubbles. A surfactant micelle with nanobubbles as the core is formed, thus considerably reducing the concentration of sodium oleate to form micelles. The adsorption of the modified nanobubbles on the mineral surface is carried out by the specific adsorption of the exposed hydrophilic group and the mineral surface. This adsorption method is superior to the hydrophobic interaction between the nanobubbles and the hydrophobic mineral surface. Further, the nanobubbles are highly selective for the activation sites on the mineral surface in the adsorption mode. This study will help understand the interaction between nanobubbles and collectors to further apply nanobubbles to treat fine-grained mineral particles.
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Affiliation(s)
- Wei Xiao
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Yulong Zhao
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Juan Yang
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Yaxin Ren
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Wei Yang
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Xiaotao Huang
- The Institute for Advanced Studies , Wuhan University , Wuhan 430072 , China
| | - Lijuan Zhang
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute , Chinese Academy of Sciences , Shanghai 201204 , China
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Ke S, Xiao W, Quan N, Dong Y, Zhang L, Hu J. Formation and Stability of Bulk Nanobubbles in Different Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5250-5256. [PMID: 30909695 DOI: 10.1021/acs.langmuir.9b00144] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The existence of bulk nanobubbles is still controversial in spite of their significance in a large range of applications. Here, we developed a new method of compression-decompression to produce controllably bulk nanobubbles. Then, we further investigated the generation of bulk nanobubbles in pure water, acid, alkaline, and salt solutions using nanoparticle tracking analysis. The results indicated that the concentration of bulk nanobubbles depends on the decompression time and would reach a maximum value when the decompression time is about 30 min for the pure water system. More importantly, we gave a relatively direct evidence of the existence of bulk nanobubbles by measuring the X-ray fluorescence intensity of Kr in acid, alkaline, and salt solutions. It is shown that the decrease tendency in intensity of Kr in alkaline solution is similar to that in the concentration of bulk nanobubbles with the deposited time, indicating that the bulk nanobubbles produced indeed have gas inside. Furthermore, the concentration and stability of bulk nanobubbles in an alkaline solution are greatest compared with other two solutions regardless of gas types. The concentration of bulk nanobubbles will decrease in the order alkaline > acid/pure water > salt solutions. We believe that our results should be very helpful in understanding the formation and stability of bulk nanobubbles in different solutions.
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Affiliation(s)
- Shuo Ke
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- Life and Environment Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Wei Xiao
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Nannan Quan
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- Life and Environment Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Yaming Dong
- Life and Environment Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Lijuan Zhang
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
| | - Jun Hu
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
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Malvis A, Hodaifa G, Halioui M, Seyedsalehi M, Sánchez S. Integrated process for olive oil mill wastewater treatment and its revalorization through the generation of high added value algal biomass. WATER RESEARCH 2019; 151:332-342. [PMID: 30616045 DOI: 10.1016/j.watres.2018.12.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 12/03/2018] [Accepted: 12/17/2018] [Indexed: 06/09/2023]
Abstract
The two-phase continuous centrifugation process for olive oil extraction generates high amounts of olive oil mill wastewater (OMW), characterized by containing large concentrations of numerous contaminant compounds for the environment. An integral process based on physico-chemical (flocculation, photolysis and microfiltration) and microalgal growth stages was proposed for its treatment. Chemical oxygen demand (COD) removal percentages were 57.5%, 88.8% and 20.5% for flocculation, photolysis and microfiltration, respectively. The global removal percentages of organic load in the primary treatment were 96.2% for COD, 80.3% for total organic carbon (TOC) and 96.6% for total phenolic compounds (TPCs). In secondary treatment, different experiments using the microalgae Chlorella pyrenoidosa were performed on a laboratory scale in stirred batch tank reactors. The OMW concentrations in each culture medium were: 5%, 10%, 25%, 50%, 75% and 100% (v/v). The common experimental conditions were: pH = 7, temperature = 25 °C, agitation speed = 200 rpm, aeration rate = 0.5 (v/v) and illumination intensity = 359 μE m-2 s-1. The highest maximum specific growth rate (0.07 h-1) and volumetric biomass production (1.25 mg/(L h)) values were achieved in the culture with 50% of OMW (v/v). The final biomass obtained had a high percentage of carbohydrates, whose content ranged from 30.3% to 89.2% and the highest lipid content (34.2%) was determined in the culture with 25% of OMW (v/v). The final treated water is suitable for its use in irrigation, discharge to receiving waters or for being reused in the same process.
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Affiliation(s)
- Ana Malvis
- Molecular Biology and Biochemical Engineering Department, Chemical Engineering Area, University of Pablo de Olavide, ES-41013, Seville, Spain
| | - Gassan Hodaifa
- Molecular Biology and Biochemical Engineering Department, Chemical Engineering Area, University of Pablo de Olavide, ES-41013, Seville, Spain; Chemical, Environmental and Materials Department, University of Jaén, Centre of Advanced Studies in Olives and Olive-Oil, ES-23071, Jaén, Spain.
| | - Mansour Halioui
- Chemical, Environmental and Materials Department, University of Jaén, Centre of Advanced Studies in Olives and Olive-Oil, ES-23071, Jaén, Spain
| | | | - Sebastián Sánchez
- Chemical, Environmental and Materials Department, University of Jaén, Centre of Advanced Studies in Olives and Olive-Oil, ES-23071, Jaén, Spain
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24
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da Silva G, Waters K. The effects of microwave irradiation on the floatability of chalcopyrite, pentlandite and pyrrhotite. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.07.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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25
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Basso A, Hamad FA, Ganesan P. Effects of the geometrical configuration of air–water mixer on the size and distribution of microbubbles in aeration systems. ASIA-PAC J CHEM ENG 2018. [DOI: 10.1002/apj.2259] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Alessio Basso
- School of Science Engineering and DesignTeesside University Middlesbrough UK
| | - F. A. Hamad
- School of Science Engineering and DesignTeesside University Middlesbrough UK
| | - P. Ganesan
- Department of Mechanical EngineeringUniversity of Malaya Kuala Lumpur Malaysia
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26
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Dlangamandla C, Ntwampe SKO, Basitere M. A bioflocculant-supported dissolved air flotation system for the removal of suspended solids, lipids and protein matter from poultry slaughterhouse wastewater. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 78:452-458. [PMID: 30101780 DOI: 10.2166/wst.2018.324] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this study, two previously identified isolates, i.e. Comamonas aquatica (BF-3) and Bacillus sp. BF-2, were determined to be suitable candidates to utilise in a bioflocculant-supported dissolved air flotation (Bio-DAF) system as a pretreatment system for poultry slaughterhouse wastewater (PSW). A 2% (v/v) (bioflocculant:PSW) strategy was used for the DAF to reduce total suspended solids (TSS), lipids and proteins in the PSW, by supplementing the bioflocculants produced and the co-culture (C. aquatica BF-3 and Bacillus sp. BF-2) directly into the DAF. The Bio-DAF was able to reduce 91% TSS, 79% proteins and 93% lipids when the DAF system was operating at steady state, in comparison with a chemical DAF operated using 2% (v/v) alum that was able to only reduce 84% TSS, 71% proteins and 92% lipids. It was concluded that the Bio-DAF system worked efficiently for the removal of suspended solids, lipids and proteins, achieving better results than when alum was used.
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Affiliation(s)
- C Dlangamandla
- Bioresource Engineering Research Group (BioERG), Department of Biotechnology, Cape Peninsula University of Technology, P.O. Box 652, Cape Town 8000, South Africa E-mail:
| | - S K O Ntwampe
- Bioresource Engineering Research Group (BioERG), Department of Biotechnology, Cape Peninsula University of Technology, P.O. Box 652, Cape Town 8000, South Africa E-mail:
| | - M Basitere
- Bioresource Engineering Research Group (BioERG), Department of Biotechnology, Cape Peninsula University of Technology, P.O. Box 652, Cape Town 8000, South Africa E-mail:
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Xiao W, Ke S, Quan N, Zhou L, Wang J, Zhang L, Dong Y, Qin W, Qiu G, Hu J. The Role of Nanobubbles in the Precipitation and Recovery of Organic-Phosphine-Containing Beneficiation Wastewater. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6217-6224. [PMID: 29739191 DOI: 10.1021/acs.langmuir.8b01123] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Dissolved air flotation (DAF) is broadly applied in wastewater treatment, especially for the recovery of organic pollution with low concentration. However, the mechanism of interaction between nanoscale gas bubbles and nanoparticles in the process of DAF remains unclear. Here, we investigated the role of nanobubbles in the precipitation of styryl phosphoric acid (SPA)-Pb particles and recovering organic phosphine containined in beneficiation wastewater by UV-vis (ultraviolet-visible) spectra, microflotation tests, nanoparticle tracking analysis, dynamic light scattering, and atomic force microscopy measurements. As suggested from the results, nanobubbles can inhibit the crystallization of SPA-Pb precipitation, which makes the sediment flotation recovery below 20%. After the precipitation crystallization is completed, nanobubbles can flocculate precipitated particles, which can promote the flotation recovery of precipitated particles to 90%. On the basis of the results, we proposed a model to explain the different roles of nanobubbles in the process of precipitation and flotation of SPA-Pb particles. This study will be helpful to understand the interaction between nanobubbles and nanoparticles in the application of flotation.
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Affiliation(s)
- Wei Xiao
- School of Minerals Processing & Bioengineering , Central South University , Changsha 410083 , China
- Key Lab of Biohydrometallurgy of Ministry of Education , Changsha 410083 , China
- Key Laboratory of Interfacial Physics and Technology, Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201800 , China
| | - Shuo Ke
- Key Laboratory of Interfacial Physics and Technology, Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201800 , China
- Life and Environmental Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Nannan Quan
- Key Laboratory of Interfacial Physics and Technology, Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201800 , China
- Life and Environmental Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Limin Zhou
- Key Laboratory of Interfacial Physics and Technology, Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201800 , China
- University of Chinese Academy of Science , Beijing , 100049 , China
| | - Jun Wang
- School of Minerals Processing & Bioengineering , Central South University , Changsha 410083 , China
- Key Lab of Biohydrometallurgy of Ministry of Education , Changsha 410083 , China
| | - Lijuan Zhang
- Key Laboratory of Interfacial Physics and Technology, Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201800 , China
| | - Yaming Dong
- Life and Environmental Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Wenqing Qin
- School of Minerals Processing & Bioengineering , Central South University , Changsha 410083 , China
- Key Lab of Biohydrometallurgy of Ministry of Education , Changsha 410083 , China
| | - Guanzhou Qiu
- School of Minerals Processing & Bioengineering , Central South University , Changsha 410083 , China
- Key Lab of Biohydrometallurgy of Ministry of Education , Changsha 410083 , China
| | - Jun Hu
- Key Laboratory of Interfacial Physics and Technology, Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201800 , China
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Senthil Kumar P, Nair AS, Ramaswamy A, Saravanan A. Nano‐zero valent iron impregnated cashew nut shell: a solution to heavy metal contaminated water/wastewater. IET Nanobiotechnol 2018; 12:591-599. [DOI: 10.1049/iet-nbt.2017.0264] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Affiliation(s)
| | - Akshaya S. Nair
- Department of Chemical EngineeringSSN College of EngineeringChennai 603110India
| | - Ananya Ramaswamy
- Department of Chemical EngineeringSSN College of EngineeringChennai 603110India
| | - Anbalagan Saravanan
- Department of BiotechnologyVel Tech High Tech Dr Rangarajan Dr Sakunthala Engineering CollegeAvadi, Chennai 600062India
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Oliveira HA, Azevedo AC, Etchepare R, Rubio J. Separation of emulsified crude oil in saline water by flotation with micro- and nanobubbles generated by a multiphase pump. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 76:2710-2718. [PMID: 29168711 DOI: 10.2166/wst.2017.441] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The flocculation-column flotation with hydraulic loading (HL, >10 m h-1) was studied for the treatment of oil-in-water emulsions containing 70-400 mg L-1 (turbidity = 70-226 NTU) of oil and salinity (30 and 100 g L-1). A polyacrylamide (Dismulgan, 20 mg L-1) flocculated the oil droplets, using two floc generator reactors, with rapid and slow mixing stages (head loss = 0.9 to 3.5 bar). Flotation was conducted in two cells (1.5 and 2.5 m) with microbubbles (MBs, 5-80 μm) and nanobubbles (NBs, 50-300 nm diameter, concentration of 108 NBs mL-1). Bubbles were formed using a centrifugal multiphase pump, with optimized parameters and a needle valve. The results showed higher efficiency with the taller column reducing the residual oil content to 4 mg L-1 and turbidity to 7 NTU. At high HL (27.5 m h-1), the residual oil concentrations were below the standard emission (29 mg L-1), reaching 18 mg L-1. The best results were obtained with high concentration of NBs (apart from the bigger bubbles). Mechanisms involved appear to be attachment and entrapment of the NBs onto and inside the flocs. Thus, the aggregates were readily captured, by bigger bubbles (mostly MBs) aiding shear withstanding. Advantages are the small footprint of the cells, low residence time and high processing rate.
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Affiliation(s)
- H A Oliveira
- Laboratório de Tecnologia Mineral e Ambiental (LTM), Departamento de Engenharia de Minas, PPGE3M, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, Porto Alegre CEP: 91501-970, RS, Brazil E-mail:
| | - A C Azevedo
- Laboratório de Tecnologia Mineral e Ambiental (LTM), Departamento de Engenharia de Minas, PPGE3M, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, Porto Alegre CEP: 91501-970, RS, Brazil E-mail:
| | - R Etchepare
- Laboratório de Tecnologia Mineral e Ambiental (LTM), Departamento de Engenharia de Minas, PPGE3M, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, Porto Alegre CEP: 91501-970, RS, Brazil E-mail: ; Present address: Departamento de Hidráulica e Saneamento, Universidade Federal do Paraná, Curitiba, PR 81531-980, Brazil
| | - J Rubio
- Laboratório de Tecnologia Mineral e Ambiental (LTM), Departamento de Engenharia de Minas, PPGE3M, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, Porto Alegre CEP: 91501-970, RS, Brazil E-mail:
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30
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Separation of emulsified crude oil in saline water by dissolved air flotation with micro and nanobubbles. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.06.007] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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31
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Etchepare R, Azevedo A, Calgaroto S, Rubio J. Removal of ferric hydroxide by flotation with micro and nanobubbles. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.05.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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32
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Mamelkina MA, Cotillas S, Lacasa E, Sáez C, Tuunila R, Sillanpää M, Häkkinen A, Rodrigo MA. Removal of sulfate from mining waters by electrocoagulation. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.03.044] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Azevedo A, Etchepare R, Rubio J. Raw water clarification by flotation with microbubbles and nanobubbles generated with a multiphase pump. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 75:2342-2349. [PMID: 28541942 DOI: 10.2166/wst.2017.113] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Raw water clarification by flotation was studied by injecting air into a centrifugal multiphase pump to generate microbubbles (MBs) and nanobubbles (NBs). Measurements of gas dispersion parameters were performed and optimal conditions were obtained using a pump pressure of 4 bar. Values showed a bubble Sauter diameter of 75 μm, an air holdup of 1.2%, a bubble surface area flux of 34 s-1 and an NB concentration of 1 × 108 NBs mL-1 (measuring 220 nm). Then, a study compared flotation with bubbles formed with the multiphase pump (F-MP) to lamellar settling at the clarification stage of a water treatment plant (WTP), in Brazil. The F-MP showed a higher separation efficiency at high hydraulic loads (9-15 m h-1), even without the use of a polymer, reaching 2 NTU (10-25 NTU raw water feed), which was much lower than the technical goal of the WTP (5 NTU). The results and the technical aspects are discussed, and it is concluded that the employment of MBs and NBs with pumps widens new research lines and applications in modern flotation.
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Affiliation(s)
- A Azevedo
- Minerals Engineering Department-PPGE3M, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Campus do Vale, Prédio 43819 - Setor 6, Porto Alegre-RS 91501-970, Brazil E-mail:
| | - R Etchepare
- Minerals Engineering Department-PPGE3M, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Campus do Vale, Prédio 43819 - Setor 6, Porto Alegre-RS 91501-970, Brazil E-mail:
| | - J Rubio
- Minerals Engineering Department-PPGE3M, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Campus do Vale, Prédio 43819 - Setor 6, Porto Alegre-RS 91501-970, Brazil E-mail:
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35
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Hao TW, Luo JH, Su KZ, Wei L, Mackey HR, Chi K, Chen GH. Example study for granular bioreactor stratification: Three-dimensional evaluation of a sulfate-reducing granular bioreactor. Sci Rep 2016; 6:31718. [PMID: 27539264 PMCID: PMC4990961 DOI: 10.1038/srep31718] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Accepted: 07/26/2016] [Indexed: 11/23/2022] Open
Abstract
Recently, sulfate-reducing granular sludge has been developed for application in sulfate-laden water and wastewater treatment. However, little is known about biomass stratification and its effects on the bioprocesses inside the granular bioreactor. A comprehensive investigation followed by a verification trial was therefore conducted in the present work. The investigation focused on the performance of each sludge layer, the internal hydrodynamics and microbial community structures along the height of the reactor. The reactor substratum (the section below baffle 1) was identified as the main acidification zone based on microbial analysis and reactor performance. Two baffle installations increased mixing intensity but at the same time introduced dead zones. Computational fluid dynamics simulation was employed to visualize the internal hydrodynamics. The 16S rRNA gene of the organisms further revealed that more diverse communities of sulfate-reducing bacteria (SRB) and acidogens were detected in the reactor substratum than in the superstratum (the section above baffle 1). The findings of this study shed light on biomass stratification in an SRB granular bioreactor to aid in the design and optimization of such reactors.
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Affiliation(s)
- Tian-Wei Hao
- Department of Civil &Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Jing-Hai Luo
- Department of Civil &Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Kui-Zu Su
- School of Civil Engineering and Water Conservancy, Hefei University of Technology, Hefei, China
| | - Li Wei
- Department of Civil &Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Hamish R Mackey
- College of Science and Engineering, Hamad bin Khalifa University, Education City, Doha, Qatar
| | - Kun Chi
- Department of Civil &Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Guang-Hao Chen
- Department of Civil &Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.,Water Technology Lab, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.,Hong Kong Branch of Chinese National Engineering Research Center for Control &Treatment of Heavy Metal Pollution, HKUST, Clear Water Bay, China
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