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Wang Y, Qian L, Yang D, Gong Y, Yuan C, Hu Y, Gu H, Sun P, Wang S. Integration of hydrothermal liquefaction of Cyanophyta and supercritical water oxidation of its aqueous phase products: Biocrude production and nutrient removal. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 914:169835. [PMID: 38190896 DOI: 10.1016/j.scitotenv.2023.169835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 12/23/2023] [Accepted: 12/30/2023] [Indexed: 01/10/2024]
Abstract
Cyanophyta has the potential to produce biocrude via hydrothermal liquefaction (HTL). However, aqueous phase products (APs), as by-products of HTL, pose a risk of eutrophication for the high levels of carbon, nitrogen, and phosphorus. Supercritical water oxidation (SCWO) can efficiently convert organics into small molecules, offering a technique for the harmless treatment of APs. Effects of holding time, pressure, and moisture content on the biocrude yields from isothermal HTL (300 °C) and fast HTL (salt bath temperature of 500 °C) were comprehensively investigated. Biocrude properties were characterized by elemental analysis, FT-IR and GC-MS. Subsequently, the APs obtained under the conditions producing the highest biocrude yield were subjected to SCWO at 550 °C with different oxidation coefficients (n) from 0 to 2. Removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH3-N), and total phosphorus (TP) were further explored. The results show that the highest biocrude yields from isothermal HTL and fast HTL were 24.2 wt% (300 °C, 1800 s, 25 MPa, and 80 wt% moisture content) and 21.9 wt% (500 °C, 40 s, 25 MPa, and 80 wt% moisture content), respectively. The biocrude primarily consisted of N-containing heterocyclic compounds, amides, and acids. SCWO effectively degraded the COD and TP in APs, while the NH3-N required further degradation. At n = 2, the highest removal rates of COD, NH3-N and TP were 98.5 %, 22.6 % and 89.1 %, respectively.
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Affiliation(s)
- Yanxin Wang
- School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Lili Qian
- School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
| | - Derui Yang
- School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Yanmeng Gong
- Jiangsu Provincial Academy of Environmental Science, Jiangsu Province Key Laboratory of Environmental Engineering, Nanjing, Jiangsu 210036, China
| | - Chuan Yuan
- School of Agricultural Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Yamin Hu
- School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Heng Gu
- School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Panpan Sun
- College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
| | - Shuang Wang
- School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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Hu M, Li Z, Huang X, Chen M, Hu ZT, Tang S, Chou IM, Pan Z, Wang Q, Wang J. Catalytic supercritical water oxidation of o-chloroaniline over Ru/rGO: Reaction variables, conversion pathways and nitrogen distribution. CHEMOSPHERE 2023; 333:138907. [PMID: 37169091 DOI: 10.1016/j.chemosphere.2023.138907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 04/22/2023] [Accepted: 05/08/2023] [Indexed: 05/13/2023]
Abstract
To ascertain the reaction variables on o-chloroaniline (o-ClA) mineralization, total nitrogen (TN) removal rate, and N-species distribution, o-ClA was subjected to catalytic supercritical water oxidation (CSCWO) in a fused quartz tube reactor (FQTR). The findings demonstrated that when the temperature, reaction time, and excess oxidant were 400 °C, 90 min, and 150%, respectively, the mineralization rate of o-ClA could reach more than 95%. Moreover, potential degradation pathways of o-ClA in supercritical water oxidation (SCWO) was proposed according to the GC-MS results. TN removal rate is significantly impacted by Ru/rGO, despite the fact that its catalytic effect on the mineralization of o-ClA was not particularly noteworthy. Compared with no catalyst, the TN removal rate of o-ClA obviously increased from 44.1% to 90.3% at 400 °C, 10 wt% Ru loading, 90 min and 200% excess oxidant. In addition, N-species distribution in SCWO and CSCWO were also investigated. Results indicated that the Ru/rGO catalyst could accelerate the oxidation of ammonia-N and convert it to nitrate-N, promoting N2 generation. Finally, the possible N transformation pathway in CSCWO of o-ClA was proposed. As a result, this work offers fundamental information about o-ClA catalytic oxidation removal in the SCWO process.
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Affiliation(s)
- Mian Hu
- College of Environment, Zhejiang University of Technology, Hangzhou, 310032, Zhejiang, China
| | - Zhibing Li
- College of Environment, Zhejiang University of Technology, Hangzhou, 310032, Zhejiang, China
| | - Xiaotong Huang
- College of Environment, Zhejiang University of Technology, Hangzhou, 310032, Zhejiang, China
| | - Meiqi Chen
- College of Environment, Zhejiang University of Technology, Hangzhou, 310032, Zhejiang, China
| | - Zhong-Ting Hu
- College of Environment, Zhejiang University of Technology, Hangzhou, 310032, Zhejiang, China
| | - Suqin Tang
- Hangzhou Environmental Group Co., Ltd, Zhejiang, China
| | - I-Ming Chou
- CAS Key Laboratory of Experimental Study Under Deep-sea Extreme Conditions, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, Hainan, China
| | - Zhiyan Pan
- College of Environment, Zhejiang University of Technology, Hangzhou, 310032, Zhejiang, China
| | - Qi Wang
- Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China.
| | - Junliang Wang
- College of Environment, Zhejiang University of Technology, Hangzhou, 310032, Zhejiang, China.
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Hamdane H, Oumam M, Mhamdi HS, Bouih A, El Ghailassi T, Boulif R, Alami J, Manoun B, Hannache H. Elaboration of geopolymer package derived from uncalcined phosphate sludge and its solidification performance on nuclear grade resins loaded with 134Cs. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159313. [PMID: 36228800 DOI: 10.1016/j.scitotenv.2022.159313] [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: 08/02/2022] [Revised: 09/20/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
Nuclear-grade Spent Organic Resin (SOR) contains high concentrations of radioactive nuclides and metal contaminants, while phosphate sludge contains high amount of fine clayey particles and CO32-, both posing a major threat to the biosphere. In this study, a novel geopolymer package (GP) was proposed to directly solidify SOR loaded with 134Cs by incorporating uncalcined phosphate sludge (UPS) as feedstocks, activated by NaOH/KOH. The results showed that alkali-mixed reagents-activated GP is more advantageous in terms of chemical stability and mechanical properties than NaOH-activated GP, recording compressive strength values greater than the waste acceptance criteria and OPC. The 28-day compressive strength of solidified packages can exceed 31 MPa at the highest amount of 42 wt% UPS. The addition of NaF powder into the solidified packages generates more hybrid type gels, which are more conducive to partial dissolution and bonding UPS particles, thereby producing stable and stronger GP. Leaching results of solidified GP in presence of up to 13 wt% SORs showed that only 0.15 % of total 134Cs was leached, even under aggressive solutions. Solidification mechanism revealed that activation of UPS-MK blend forms N,K-A-S-H, (N,K,C)-A-S-H/C-S-H gels coexisting with unreacted particles, thereby solidify/stabilize metal contaminants and Cs+ by a synergetic immobilization action of hydration products via substitution and encapsulation. This study provides a promising paradigm for effective solidification of nuclear-grade resins and synergetic harmless treatment of industrial/phosphate mine solid wastes.
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Affiliation(s)
- Hasna Hamdane
- Laboratory of Engineering and Materials, Faculty of Science Ben M'Sick, Hassan II University of Casablanca, B.P.7955 Casablanca, Morocco; National Center of Sciences, Technology and Nuclear Energy, B.P.1382 Rabat, Morocco.
| | - Mina Oumam
- Laboratory of Engineering and Materials, Faculty of Science Ben M'Sick, Hassan II University of Casablanca, B.P.7955 Casablanca, Morocco
| | - Hicham Si Mhamdi
- Laboratory of Applied Geology, Department of Geosciences, Faculty of Sciences and Techniques Errachidia, Moulay Ismail University of Meknes, Morocco
| | - Abderrahim Bouih
- National Center of Sciences, Technology and Nuclear Energy, B.P.1382 Rabat, Morocco
| | - Touria El Ghailassi
- National Center of Sciences, Technology and Nuclear Energy, B.P.1382 Rabat, Morocco
| | - Rachid Boulif
- Chemical and Biochemical Sciences Department, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, 43150 Benguerir, Morocco
| | - Jones Alami
- Materials Science and Nano-Engineering Department, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, 43150 Benguerir, Morocco
| | - Bouchaib Manoun
- Materials Science and Nano-Engineering Department, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, 43150 Benguerir, Morocco; Univ Hassan(1er), Rayonnement-Matière et Instrumentation, S3M, Faculty of science and Technology, 26000, FST, Settat, Morocco
| | - Hassan Hannache
- Laboratory of Engineering and Materials, Faculty of Science Ben M'Sick, Hassan II University of Casablanca, B.P.7955 Casablanca, Morocco; Materials Science and Nano-Engineering Department, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, 43150 Benguerir, Morocco
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Hafeez MA, Singh BK, Yang SH, Kim J, Kim B, Shin Y, Um W. Recent advances in Fenton-like treatment of radioactive ion exchange resins. CHEMICAL ENGINEERING JOURNAL ADVANCES 2023. [DOI: 10.1016/j.ceja.2023.100461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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Alhindawy IG, Mira HI, Youssef AO, Abdelwahab SM, Zaher AA, El-Said WA, Elshehy EA, Abdelkader AM. Cobalt doped titania-carbon nanosheets with induced oxygen vacancies for photocatalytic degradation of uranium complexes in radioactive wastes. NANOSCALE ADVANCES 2022; 4:5330-5342. [PMID: 36540120 PMCID: PMC9724698 DOI: 10.1039/d2na00467d] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 10/05/2022] [Indexed: 06/03/2023]
Abstract
The photocatalytic degradation of uranium complexes is considered among the most efficient techniques for the efficient removal of uranium ions/complexes from radioactive wastewater. Described here is a nanostructured photocatalyst based on a cobalt-doped TiO2 composite with induced oxygen vacancies (Co@TiO2-C) for the photocatalytic removal of uranium complexes from contaminated water. The synergy between oxygen vacancies and Co-doping produced a material with a 1.7 eV bandgap, while the carbon network facilitates electron movement and hinders the e-h recombination. As a result, the new photocatalyst enables the decomposition of uranium-arsenazo iii complexes (U-ARZ3), followed by photocatalytic reduction of hexavalent uranium to insoluble tetravalent uranium. Combined with the nanosheet structure's high surface area, the photocatalytic decomposition, reduction efficiency, and kinetics were significantly enhanced, achieving almost complete U(vi) removal in less than 20 minutes from solution with a concentration as high as 1000 mL g-1. Moreover, the designed photocatalyst exhibits excellent stability and reusability without decreasing the photocatalytic performance after 5 cycles.
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Affiliation(s)
| | - Hamed I Mira
- Nuclear Materials Authority El Maadi Cairo Egypt
| | - Ahmed O Youssef
- Department of Chemistry, Faculty of Science, Ain Shams University Cairo Egypt
| | - Saad M Abdelwahab
- Department of Chemistry, Faculty of Science, Ain Shams University Cairo Egypt
| | - Ahmed A Zaher
- Department of Chemistry, Faculty of Science, Mansoura University Elmansoura Egypt
| | - Waleed A El-Said
- Department of Chemistry, Faculty of Science, Assiut University Assiut 71516 Egypt
- University of Jeddah, College of Science, Department of Chemistry PO Box 80327 Jeddah 21589 Saudi Arabia
| | | | - Amr M Abdelkader
- Department of Engineering, Bournemouth University Talbot Campus, Fern Barrow Poole BH12 5BB UK
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Immobilization of iodine waste via moderate temperature sintering of (Ag)iodosodalite. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Feng P, Yang W, Xu D, Ma M, Guo Y, Jing Z. Characteristics, mechanisms and measurement methods of dissolution and deposition of inorganic salts in sub-/supercritical water. WATER RESEARCH 2022; 225:119167. [PMID: 36183545 DOI: 10.1016/j.watres.2022.119167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/20/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
The efficient and harmless treatment of hypersaline organic wastes has become an urgent environmental problem. Compared to traditional thermochemical methods, supercritical water oxidation has been proven to be an efficient organic waste treatment technology due to the advantages of low cost, high degradation rate, no secondary pollutants, etc. However, the solubilities of inorganic salts drop rapidly near the critical point of water, and some sticky salts form easily agglomerates and then adhere to internal surfaces of reactor and pipeline, causing plugging and inhibition of heat transfer. Hence, the characteristics, mechanisms and measurement methods of the dissolution and deposition of inorganic salts in sub-/supercritical water are summarized and analyzed systematically and comprehensively in this work, intending to provide a valuable guide for salt deposition prevention and subsequent research directions. Firstly, a new classification form of inorganic salt is put forward based on melting point. The phase equilibriums of brine systems are then analyzed in detail. Six theories concerning dissolution mechanisms are discussed deeply and various measurement methods of salt solubility are also supplemented. Furthermore, salt deposition characteristics and related measurement technologies are summarized. Notably, a new idea "hydrothermal molten salt" system is reviewed which may provide a solution for salt deposition in sub/supercritical water. Finally, an outlook for the follow-up researches is prospected and some suggestions are proposed.
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Affiliation(s)
- Peng Feng
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Wanpeng Yang
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Donghai Xu
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
| | - Mingyan Ma
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Yang Guo
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
| | - Zefeng Jing
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
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Ren Y, Wu Z, Meng X, Ou G, Kou J, Jin H, Guo L. Large eddy simulation of water jets under transcritical and supercritical conditions. J Supercrit Fluids 2022. [DOI: 10.1016/j.supflu.2022.105648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Yang B, Ma Q, Ren X, Peng X, Wang H, Li L, Hao J. Supercritical Water Oxidation of Aniline, Nitrobenzene, and Indole: Effect of Catalysts on Nitrogen Conversion Mechanism. J Supercrit Fluids 2022. [DOI: 10.1016/j.supflu.2022.105680] [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]
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