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Díaz V, Antiñolo L, Poyatos JM, Muñío MDM, Martín-Pascual J. Effect of hydraulic retention time and treated urban wastewater ratio on progressive adaptation of an inoculated microalgae in membrane photobioreactors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 371:123005. [PMID: 39476682 DOI: 10.1016/j.jenvman.2024.123005] [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: 04/26/2024] [Revised: 09/23/2024] [Accepted: 10/20/2024] [Indexed: 11/28/2024]
Abstract
Currently, there is a growing concern about water scarcity. The rising demand for wastewater treatment systems that facilitate the reuse of wastewater has resulted in a focus on the use of microalgae in sustainable treatments. These methods not only eliminate nutrients from the wastewater but also produce biomass that can be used to obtain high-value products. This study aimed to observe the effect of different hydraulic retention times (HRTs) and treated urban wastewater (TUWW) percentages on the growth of microalgae biomass and nutrient consumption in membrane photobioreactors. Microalgae biomass growth increases with HRT regardless of the percentage of TUWW. Biomass concentration stabilises at between 40% and 60% TUWW but significantly increases when 100% TUWW is used, resulting in the highest biomass concentrations. As HRT increases, ammonium and total nitrogen consumption also rise. A positive trend in ammonium consumption was observed with increasing TUWW, reaching its peak with 100% TUWW. The optimal conditions for biomass growth and nutrient removal are achieved with a 7-day HRT and 100% TUWW as influent, which was confirmed as optimal with the response surface methodology.
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Affiliation(s)
- Verónica Díaz
- Department of Civil Engineering, University of Granada 18071, Granada, Spain; Institute of Water Research, University of Granada 18071, Granada, Spain.
| | - Laura Antiñolo
- Department of Civil Engineering, University of Granada 18071, Granada, Spain; Institute of Water Research, University of Granada 18071, Granada, Spain.
| | - José Manuel Poyatos
- Department of Civil Engineering, University of Granada 18071, Granada, Spain; Institute of Water Research, University of Granada 18071, Granada, Spain.
| | - María Del Mar Muñío
- Institute of Water Research, University of Granada 18071, Granada, Spain; Department of Chemical Engineering, University of Granada 18071, Granada, Spain.
| | - Jaime Martín-Pascual
- Department of Civil Engineering, University of Granada 18071, Granada, Spain; Institute of Water Research, University of Granada 18071, Granada, Spain.
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Wang L, Lu W, Song Y, Liu S, Fu YV. Using machine learning to identify environmental factors that collectively determine microbial community structure of activated sludge. ENVIRONMENTAL RESEARCH 2024; 260:119635. [PMID: 39025351 DOI: 10.1016/j.envres.2024.119635] [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: 05/14/2024] [Revised: 07/12/2024] [Accepted: 07/15/2024] [Indexed: 07/20/2024]
Abstract
Activated sludge (AS) microbial communities are influenced by various environmental variables. However, a comprehensive analysis of how these variables jointly and nonlinearly shape the AS microbial community remains challenging. In this study, we employed advanced machine learning techniques to elucidate the collective effects of environmental variables on the structure and function of AS microbial communities. Applying Dirichlet multinomial mixtures analysis to 311 global AS samples, we identified four distinct microbial community types (AS-types), each characterized by unique microbial compositions and metabolic profiles. We used 14 classical linear and nonlinear machine learning methods to select a baseline model. The extremely randomized trees demonstrated optimal performance in learning the relationship between environmental factors and AS types (with an accuracy of 71.43%). Feature selection identified critical environmental factors and their importance rankings, including latitude (Lat), longitude (Long), precipitation during sampling (Precip), solids retention time (SRT), effluent total nitrogen (Effluent TN), average temperature during sampling month (Avg Temp), mixed liquor temperature (Mixed Temp), influent biochemical oxygen demand (Influent BOD), and annual precipitation (Annual Precip). Significantly, Lat, Long, Precip, Avg Temp, and Annual Precip, influenced metabolic variations among AS types. These findings emphasize the pivotal role of environmental variables in shaping microbial community structures and enhancing metabolic pathways within activated sludge. Our study encourages the application of machine learning techniques to design artificial activated sludge microbial communities for specific environmental purposes.
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Affiliation(s)
- Lu Wang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Weilai Lu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yang Song
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Shuangjiang Liu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yu Vincent Fu
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China; Savaid Medical School, University of Chinese Academy of Sciences, Beijing, 100049, China.
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Lian C, Xiang J, Cai H, Ke J, Ni H, Zhu J, Zheng Z, Lu K, Yang W. Microalgae Inoculation Significantly Shapes the Structure, Alters the Assembly Process, and Enhances the Stability of Bacterial Communities in Shrimp-Rearing Water. BIOLOGY 2024; 13:54. [PMID: 38275730 PMCID: PMC10813777 DOI: 10.3390/biology13010054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 01/10/2024] [Accepted: 01/18/2024] [Indexed: 01/27/2024]
Abstract
Intensive shrimp farming may lead to adverse environmental consequences due to discharged water effluent. Inoculation of microalgae can moderate the adverse effect of shrimp-farming water. However, how bacterial communities with different lifestyles (free-living (FL) and particle-attached (PA)) respond to microalgal inoculation is unclear. In the present study, we investigated the effects of two microalgae (Nannochloropsis oculata and Thalassiosira weissflogii) alone or in combination in regulating microbial communities in shrimp-farmed water and their potential applications. PERMANOVA revealed significant differences among treatments in terms of time and lifestyle. Community diversity analysis showed that PA bacteria responded more sensitively to different microalgal treatments than FL bacteria. Redundancy analysis (RDA) indicated that the bacterial community was majorly influenced by environmental factors, compared to microalgal direct influence. Moreover, the neutral model analysis and the average variation degree (AVD) index indicated that the addition of microalgae affected the bacterial community structure and stability during the stochastic process, and the PA bacterial community was the most stable with the addition of T. weissflogii. Therefore, the present study revealed the effects of microalgae and nutrient salts on bacterial communities in shrimp aquaculture water by adding microalgae to control the process of community change. This study is important for understanding the microbial community assembly and interpreting complex interactions among zoo-, phyto-, and bacterioplankton in shrimp aquaculture ecosystems. Additionally, these findings may contribute to the sustainable development of shrimp aquaculture and ecosystem conservation.
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Affiliation(s)
- Chen Lian
- School of Marine Sciences, Ningbo University, No. 169 Qixingnan Road, Beilun District, Ningbo 315832, China; (C.L.); (J.X.); (J.K.); (H.N.); (J.Z.); (Z.Z.); (K.L.)
| | - Jie Xiang
- School of Marine Sciences, Ningbo University, No. 169 Qixingnan Road, Beilun District, Ningbo 315832, China; (C.L.); (J.X.); (J.K.); (H.N.); (J.Z.); (Z.Z.); (K.L.)
| | - Huifeng Cai
- Fishery Technical Management Service Station of Yinzhou District, Ningbo 315100, China;
| | - Jiangdong Ke
- School of Marine Sciences, Ningbo University, No. 169 Qixingnan Road, Beilun District, Ningbo 315832, China; (C.L.); (J.X.); (J.K.); (H.N.); (J.Z.); (Z.Z.); (K.L.)
| | - Heng Ni
- School of Marine Sciences, Ningbo University, No. 169 Qixingnan Road, Beilun District, Ningbo 315832, China; (C.L.); (J.X.); (J.K.); (H.N.); (J.Z.); (Z.Z.); (K.L.)
| | - Jinyong Zhu
- School of Marine Sciences, Ningbo University, No. 169 Qixingnan Road, Beilun District, Ningbo 315832, China; (C.L.); (J.X.); (J.K.); (H.N.); (J.Z.); (Z.Z.); (K.L.)
| | - Zhongming Zheng
- School of Marine Sciences, Ningbo University, No. 169 Qixingnan Road, Beilun District, Ningbo 315832, China; (C.L.); (J.X.); (J.K.); (H.N.); (J.Z.); (Z.Z.); (K.L.)
| | - Kaihong Lu
- School of Marine Sciences, Ningbo University, No. 169 Qixingnan Road, Beilun District, Ningbo 315832, China; (C.L.); (J.X.); (J.K.); (H.N.); (J.Z.); (Z.Z.); (K.L.)
| | - Wen Yang
- School of Marine Sciences, Ningbo University, No. 169 Qixingnan Road, Beilun District, Ningbo 315832, China; (C.L.); (J.X.); (J.K.); (H.N.); (J.Z.); (Z.Z.); (K.L.)
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Babu Ponnusami A, Sinha S, Ashokan H, V Paul M, Hariharan SP, Arun J, Gopinath KP, Hoang Le Q, Pugazhendhi A. Advanced oxidation process (AOP) combined biological process for wastewater treatment: A review on advancements, feasibility and practicability of combined techniques. ENVIRONMENTAL RESEARCH 2023; 237:116944. [PMID: 37611785 DOI: 10.1016/j.envres.2023.116944] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 08/15/2023] [Accepted: 08/19/2023] [Indexed: 08/25/2023]
Abstract
Complexity of wastewater is the most challenging phenomenon on successful degradation of pollutant via any wastewater treatment regime. Upon availability of numerous techniques, Advanced Oxidation Processes (AOP) is the most promising technique for treating industrial wastewater. Higher operating cost is the most promising factor that possess challenge for the industrial scale usage of the AOP process. Combination of biological process with AOP helps in achieving sustainable degradation of toxic pollutant in the wastewater. AOP result in complete or partial degradation of toxic emerging pollutants with the help of free radicals like hydroxyl, superoxide, hydroperoxyl and sulphate radicals. In addition to this the presence of bio-enzymes and microorganisms helps in sustainable degradation of pollutant in an economical and environmentally friendly strategy. In this review, a detailed discussion was conducted on various AOP, focusing on catalytic ozonation, electrochemical oxidation, Sono chemical and photocatalytic processes. With the need for sustainable solutions for wastewater treatment, the use of AOP in conjunction with biological process has innumerous opportunities for not only wastewater treatment but also the production of high value by-products. Further, the effect of AOP combined biological processes needs to be analyzed in real time for the different concentration of industrial wastewater and their benefits needs to be explored in future towards achieving SDGs.
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Affiliation(s)
- A Babu Ponnusami
- School of Chemical Engineering, Vellore Institute of Technology (VIT), Vellore - 632 014, Tamilnadu , India
| | - Sanyukta Sinha
- School of Chemical Engineering, Vellore Institute of Technology (VIT), Vellore - 632 014, Tamilnadu , India
| | - Hridya Ashokan
- School of Chemical Engineering, Vellore Institute of Technology (VIT), Vellore - 632 014, Tamilnadu , India
| | - Mathew V Paul
- School of Chemical Engineering, Vellore Institute of Technology (VIT), Vellore - 632 014, Tamilnadu , India
| | - Sai Prashant Hariharan
- School of Chemical Engineering, Vellore Institute of Technology (VIT), Vellore - 632 014, Tamilnadu , India
| | - J Arun
- Centre for Waste Management, Sathyabama Institute of Science and Technology, Rajiv Gandhi Salai (OMR), Jeppiaar Nagar, Chennai, 600119, Tamil Nadu, India
| | - K P Gopinath
- Department of Chemical Engineering, Mohamed Sathak Engineering College, Sathak Nagar, SH 49, Keelakarai, Tamil Nadu 623806
| | - Quynh Hoang Le
- School of Medicine and Pharmacy, Duy Tan University, Da Nang, Vietnam; Institute of Research and Development, Duy Tan University, Da Nang, Vietnam
| | - Arivalagan Pugazhendhi
- School of Medicine and Pharmacy, Duy Tan University, Da Nang, Vietnam; Institute of Research and Development, Duy Tan University, Da Nang, Vietnam.
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Shi Y, Wang X, Cai H, Ke J, Zhu J, Lu K, Zheng Z, Yang W. The Assembly Process of Free-Living and Particle-Attached Bacterial Communities in Shrimp-Rearing Waters: The Overwhelming Influence of Nutrient Factors Relative to Microalgal Inoculation. Animals (Basel) 2023; 13:3484. [PMID: 38003102 PMCID: PMC10668652 DOI: 10.3390/ani13223484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/03/2023] [Accepted: 11/08/2023] [Indexed: 11/26/2023] Open
Abstract
The ecological functions of bacterial communities vary between particle-attached (PA) lifestyles and free-living (FL) lifestyles, and separately exploring their community assembly helps to elucidate the microecological mechanisms of shrimp rearing. Microalgal inoculation and nutrient enrichment during shrimp rearing are two important driving factors that affect rearing-water bacterial communities, but their relative contributions to the bacterial community assembly have not been evaluated. Here, we inoculated two microalgae, Nannochloropsis oculata and Thalassiosira weissflogii, into shrimp-rearing waters to investigate the distinct effects of various environmental factors on PA and FL bacterial communities. Our study showed that the composition and representative bacteria of different microalgal treatments were significantly different between the PA and FL bacterial communities. Regression analyses and Mantel tests revealed that nutrients were vital factors that constrained the diversity, structure, and co-occurrence patterns of both the PA and FL bacterial communities. Partial least squares path modeling (PLS-PM) analysis indicated that microalgae could directly or indirectly affect the PA bacterial community through nutrient interactions. Moreover, a significant interaction was detected between PA and FL bacterial communities. Our study reveals the unequal effects of microalgae and nutrients on bacterial community assembly and helps explore microbial community assembly in shrimp-rearing ecosystems.
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Affiliation(s)
- Yikai Shi
- School of Marine Sciences, Ningbo University, No.169 Qixingnan Road, Beilun District, Ningbo 315832, China; (Y.S.); (X.W.); (J.K.); (J.Z.); (K.L.); (Z.Z.)
| | - Xuruo Wang
- School of Marine Sciences, Ningbo University, No.169 Qixingnan Road, Beilun District, Ningbo 315832, China; (Y.S.); (X.W.); (J.K.); (J.Z.); (K.L.); (Z.Z.)
| | - Huifeng Cai
- Fishery Technical Management Service Station of Yinzhou District, Ningbo 315100, China;
| | - Jiangdong Ke
- School of Marine Sciences, Ningbo University, No.169 Qixingnan Road, Beilun District, Ningbo 315832, China; (Y.S.); (X.W.); (J.K.); (J.Z.); (K.L.); (Z.Z.)
| | - Jinyong Zhu
- School of Marine Sciences, Ningbo University, No.169 Qixingnan Road, Beilun District, Ningbo 315832, China; (Y.S.); (X.W.); (J.K.); (J.Z.); (K.L.); (Z.Z.)
| | - Kaihong Lu
- School of Marine Sciences, Ningbo University, No.169 Qixingnan Road, Beilun District, Ningbo 315832, China; (Y.S.); (X.W.); (J.K.); (J.Z.); (K.L.); (Z.Z.)
| | - Zhongming Zheng
- School of Marine Sciences, Ningbo University, No.169 Qixingnan Road, Beilun District, Ningbo 315832, China; (Y.S.); (X.W.); (J.K.); (J.Z.); (K.L.); (Z.Z.)
| | - Wen Yang
- School of Marine Sciences, Ningbo University, No.169 Qixingnan Road, Beilun District, Ningbo 315832, China; (Y.S.); (X.W.); (J.K.); (J.Z.); (K.L.); (Z.Z.)
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6
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Collao J, García-Encina PA, Blanco S, Bolado-Rodríguez S, Fernandez-Gonzalez N. Current Concentrations of Zn, Cu, and As in Piggery Wastewater Compromise Nutrient Removals in Microalgae–Bacteria Photobioreactors Due to Altered Microbial Communities. BIOLOGY 2022; 11:biology11081176. [PMID: 36009803 PMCID: PMC9405037 DOI: 10.3390/biology11081176] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 07/31/2022] [Accepted: 08/02/2022] [Indexed: 01/04/2023]
Abstract
Simple Summary Photobioreactor systems based on consortia of microalgae and bacteria are a promising, efficient and sustainable alternative for treatment of wastewaters with high nitrogen content, such as piggery wastewater. In these biological systems, microorganisms play a key role in wastewater treatment by degradation of organic matter and accumulation of nutrients into the generated biomass. However, these wastewaters often contain high concentrations of zinc, copper and arsenic, which can severely affect the activity and growth of microorganisms, and so, the wastewater treatment performance. This article studies the effect of high concentrations of zinc, copper and arsenic on microbial communities, specifically microalgae and bacteria, in photobioreactors treating piggery wastewater, with the aim of elucidating their impact on wastewater treatment performance. For this purpose, the growth of microalgae and the composition and structure of bacterial communities exposed to these pollutants were studied. The performance of the reactors was also evaluated by determining the removal of nutrients, zinc, copper and arsenic. The results showed that high concentrations of zinc, copper and arsenic in piggery wastewater significantly affect the microbiome of the reactors without recovery after exposure to these contaminants, resulting in poorer performance of the reactors and compromising the environmental and health impact of treated effluents. Abstract The treatment of pig manure is a major environmental issue, and photobioreactors containing consortia of microalgae and bacteria have proven to be a promising and sustainable treatment alternative. This work studies the effect of Cu, Zn and As, three toxic elements frequently present in piggery wastewater, on the performance and microbiome of photobioreactors. After dopage with Zn (100 mg/L), Cu (100 mg/L), and As (500 µg/L), the high biomass uptake of Zn (69–81%) and Cu (81–83%) decreased the carbon removal in the photobioreactors, inhibited the growth of Chlorella sp., and affected heterotrophic bacterial populations. The biomass As uptake result was low (19%) and actually promoted microalgae growth. The presence of Cu and As decreased nitrogen removal, reducing the abundance of denitrifying bacterial populations. The results showed that metal(loid)s significantly affected 24 bacterial genera and that they did not recover after exposure. Therefore, this study makes an important contribution on the impact of the presence of metal(loid)s in piggery wastewater that compromises the overall performance of PBRs, and so, the environmental and health impact of treated effluents.
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Affiliation(s)
- Javiera Collao
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
- Institute of Sustainable Processes (ISP), University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
| | - Pedro Antonio García-Encina
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
- Institute of Sustainable Processes (ISP), University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
| | - Saúl Blanco
- Department of Biodiversity and Environmental Management, University of León, 24071 León, Spain
| | - Silvia Bolado-Rodríguez
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
- Institute of Sustainable Processes (ISP), University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
- Correspondence: ; Tel.: +34-983423958
| | - Nuria Fernandez-Gonzalez
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
- Institute of Sustainable Processes (ISP), University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
- Department of Systems Biology, Spanish Center for Biotechnology, CSIC, C/Darwin n°3, 28049 Madrid, Spain
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Tripathi S, Purchase D, Chandra R, Nadda AK, Bhargava PC. Mitigation of hazards and risks of emerging pollutants through innovative treatment techniques of post methanated distillery effluent - A review. CHEMOSPHERE 2022; 300:134586. [PMID: 35427655 DOI: 10.1016/j.chemosphere.2022.134586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/28/2022] [Accepted: 04/08/2022] [Indexed: 06/14/2023]
Abstract
Distillery wastewater has high biological and chemical oxygen demand and requires additional treatment before it can be safely discharged into receiving water. It is usually processed through a biomethanation digester and the end product is the post-methanated distillery effluent (PMDE). Research have shown that PMDE released by molasses-based distilleries is a hazardous effluent that can cause harm to the biota and the environment; it contains elevated amount of total dissolved solids (TDS), total suspended solids (TSS) and excess levels of persistent organic compounds (POPs), heavy metals, phenolic compounds, and salts. The practice of wastewater reuse for irrigation in many water scarce countries necessitates the proper treatment of PMDE before it is discharged into receiving water. Convention methods have been in practice for decades, but innovative technologies are needed to enhance the efficiency of PMDE treatment. Advance physical treatment such as membrane separation technology using graphene, ion-exchange and ultrafiltration membranes; chemical treatment such as advanced oxidation methods, electrocoagulation and photocatalytic technologies; biological treatment such as microbial and enzymatic treatment; and hybrid treatment such as microbial-fuel cell (MFC), genetically modified organisms (GMO) and constructed wetland technologies, are promising new methods to improve the quality of PMDE. This review provides insight into current accomplishments evaluates their suitability and discusses future developments in the detoxification of PMDE. The consolidated knowledge will help to develop a better management for the safe disposal and the reuse of PMDE wastewater.
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Affiliation(s)
- Sonam Tripathi
- Aquatic Toxicology Laboratory, Environmental Toxicology Group, Council of Scientific and Industrial Research-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, M.G. Marg, Lucknow, 226001, Uttar Pradesh, India
| | - Diane Purchase
- Department of Natural Sciences, Faculty of Science and Technology, Middlesex University, The Burroughs, London, NW4 4BT, UK
| | - Ram Chandra
- Department of Environmental Microbiology, Babasaheb Bhimrao Ambedkar Central University, Vidya Vihar, Raebareli Road, Lucknow, 226025, U.P, India
| | - Ashok Kumar Nadda
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology, Waknaghat, Solan, 173 234, India
| | - Preeti Chaturvedi Bhargava
- Aquatic Toxicology Laboratory, Environmental Toxicology Group, Council of Scientific and Industrial Research-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, M.G. Marg, Lucknow, 226001, Uttar Pradesh, India.
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Advanced HRT-Controller Aimed at Optimising Nitrogen Recovery by Microalgae: Application in an Outdoor Flat-Panel Membrane Photobioreactor. CHEMENGINEERING 2022. [DOI: 10.3390/chemengineering6020024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A fuzzy knowledge-based controller of hydraulic retention time (HRT) was designed and tested in an outdoor membrane photobioreactor (MPBR) to improve nitrogen recovery from a microalgae cultivation system, maintaining the algae as photosynthetically active as possible and limiting their competition with other microorganisms. The hourly flow of the MPBR system was optimised by adjusting the influent flow rate to the outdoor environmental conditions which microalgae were exposed to at any moment and to the nitrogen uptake capacity of the culture. A semi-empirical photosynthetically active radiation (PAR) prediction model was calibrated using total cloud cover (TCC) forecast. Dissolved oxygen, standardised to 25 °C (DO25), was used as an on-line indicator of microalgae photosynthetic activity. Different indexes, based on suspended solids (SS), DO25, and predicted and real PAR, were used as input variables, while the initial HRT of each operating day (HRT0) and the variation of HRT (ΔHRT) served as output variables. The nitrogen recovery efficiency, measured as nitrogen recovery rate (NRR) per nitrogen loading rate (NLR) in pseudo-steady state conditions, was improved by 45% when the HRT-controller was set in comparison to fixed 1.25-d HRT. Consequently, the average effluent total soluble nitrogen (TSN) concentration in the MPBR was reduced by 47%, accomplishing the discharge requirements of the EU Directive 91/271/EEC.
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9
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Zhu F, Chen X, Cui Y, Hu X, Qian J, Wang F, Kubar AA, Xu L, Huo S. Weak magnetic field intervention on outdoor production of oil-rich filamentous microalgae: Influence of seasonal changes. BIORESOURCE TECHNOLOGY 2022; 348:126707. [PMID: 35033643 DOI: 10.1016/j.biortech.2022.126707] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/07/2022] [Accepted: 01/08/2022] [Indexed: 06/14/2023]
Abstract
The weak magnetic field (MF) intervention on the semi-continuous system of filamentous algae Tribonema sp. during outdoor cultivation was investigated using starch wastewater. Results show that except for winter, MF in other seasons can effectively improve the algal biomass yield and oil productivity. In summer, the biomass concentration and oil productivity of Tribonema sp. could reach up to 14.7 g/L and 0.216 g/(L d) (130 mT), which increased by 9.8% and 35.8% respectively compared with the control group without MF intervention. By continuously shortening HRT to increase the nutrient load, the removal rate of COD, total nitrogen and total phosphorus all reached more than 87.9%. MF intervention not only weakened the bacterial diversity in open-photobioreactors system but also proved to be beneficial to the establishment of bacteria-algae symbiotic system. As a non-transgenic method, MF effectively up-regulated the growth of filamentous microalgae and promoted the biosynthesis productivity of high value-added compounds.
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Affiliation(s)
- Feifei Zhu
- School of Life Sciences, Jiangsu University, Zhenjiang 212013, China|
| | - Xiu Chen
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Yi Cui
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Xinjuan Hu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Jingya Qian
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Feng Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Ameer Ali Kubar
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Ling Xu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Shuhao Huo
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
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Morillas-España A, Lafarga T, Sánchez-Zurano A, Acién-Fernández FG, González-López C. Microalgae based wastewater treatment coupled to the production of high value agricultural products: Current needs and challenges. CHEMOSPHERE 2022; 291:132968. [PMID: 34800510 DOI: 10.1016/j.chemosphere.2021.132968] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 11/12/2021] [Accepted: 11/16/2021] [Indexed: 06/13/2023]
Abstract
One of the main social and economic challenges of the 21st century will be to overcome the worlds' water deficit expected by the end of this decade. Microalgae based wastewater treatment has been suggested as a strategy to recover nutrients from wastewater while simultaneously producing clean water. Consortia of microalgae and bacteria are responsible for recovering nutrients from wastewater. A better understanding of how environmental and operational conditions affect the composition of the microalgae-bacteria consortia would allow to maximise nutrient recoveries and biomass productivities. Most of the studies reported to date showed promising results, although up-scaling of these processes to reactors larger than 100 m2 is needed to better predict their industrial relevance. The main advantage of microalgae based wastewater treatment is that valuable biomass with unlimited applications is produced as a co-product. The aim of the current paper was to review microalgae based wastewater treatment processes focusing on strategies that allow increasing both biomass productivities and nutrient recoveries. Moreover, the benefits of microalgae based agricultural products were also discussed.
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Affiliation(s)
- Ainoa Morillas-España
- Department of Chemical Engineering, University of Almeria, 04120, Almeria, Spain; CIESOL Solar Energy Research Centre, Joint Centre University of Almería-CIEMAT, 04120, Almería, Spain
| | - Tomas Lafarga
- Department of Chemical Engineering, University of Almeria, 04120, Almeria, Spain; CIESOL Solar Energy Research Centre, Joint Centre University of Almería-CIEMAT, 04120, Almería, Spain.
| | - Ana Sánchez-Zurano
- Department of Chemical Engineering, University of Almeria, 04120, Almeria, Spain; CIESOL Solar Energy Research Centre, Joint Centre University of Almería-CIEMAT, 04120, Almería, Spain
| | - Francisco Gabriel Acién-Fernández
- Department of Chemical Engineering, University of Almeria, 04120, Almeria, Spain; CIESOL Solar Energy Research Centre, Joint Centre University of Almería-CIEMAT, 04120, Almería, Spain
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Ciardi M, Gómez-Serrano C, Morales-Amaral MDM, Acién G, Lafarga T, Fernández-Sevilla JM. Optimisation of Scenedesmus almeriensis production using pig slurry as the sole nutrient source. ALGAL RES 2022. [DOI: 10.1016/j.algal.2021.102580] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Morillas-España A, Lafarga T, Sánchez-Zurano A, Acién-Fernández FG, Rodríguez-Miranda E, Gómez-Serrano C, González-López CV. Year-long evaluation of microalgae production in wastewater using pilot-scale raceway photobioreactors: Assessment of biomass productivity and nutrient recovery capacity. ALGAL RES 2021. [DOI: 10.1016/j.algal.2021.102500] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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13
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Morillas-España A, Sánchez-Zurano A, Gómez-Serrano C, Ciardi M, Acién G, Clagnan E, Adani F, Lafarga T. Potential of the cyanobacteria Anabaena sp. and Dolichospermum sp. for being produced using wastewater or pig slurry: Validation using pilot-scale raceway reactors. ALGAL RES 2021. [DOI: 10.1016/j.algal.2021.102517] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Annual assessment of the wastewater treatment capacity of the microalga Scenedesmus almeriensis and optimisation of operational conditions. Sci Rep 2021; 11:21651. [PMID: 34737353 PMCID: PMC8569198 DOI: 10.1038/s41598-021-01163-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/19/2021] [Indexed: 11/08/2022] Open
Abstract
The depth of the culture and the dilution rate have a striking effect on the biomass productivity and the nutrient recovery capacity of microalgal cultures. The combination of culture depth and dilution rate that allows to maximise the performance of the system depends on environmental conditions. In the current study, a response surface methodology was used to explore the relationship between the two most relevant operational conditions and the biomass productivity achieved in 8.3 m2 pilot-scale raceways operated using urban wastewater. Four polynomial models were developed, one for each season of the year. The software predicted biomass productivities of 12.3, 25.6, 32.7, and 18.9 g·m-2·day-1 in winter, spring, summer, and autumn, respectively. The models were further validated at pilot-scale with R2 values ranging within 0.81 and 0.91, depending on the season. Lower culture depths had the advantage of minimising nitrification and stripping but allow to process a lower volume of wastewater per surface area. Biomass productivity was higher at culture depths of 0.05 m, when compared to 0.12 and 0.20 m, while the optimal dilution rate was season-dependent. Results reported herein are useful for optimising the biomass productivity of raceway reactors located outdoors throughout the year.
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