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Gao B, Zhang J, Liu J, Ayati A, Sillanpää M. Excess sludge-based biochar loaded with manganese enhances catalytic ozonation efficiency for landfill leachate treatment. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 346:123591. [PMID: 38367696 DOI: 10.1016/j.envpol.2024.123591] [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: 12/01/2023] [Revised: 02/08/2024] [Accepted: 02/14/2024] [Indexed: 02/19/2024]
Abstract
This study developed an efficient and stable landfill leachate treatment process, which was based on the combination of biochar catalytic ozonation and activated sludge technology for intensive treatment of landfill leachate, aiming to achieve the standard discharge of leachate. The focus is to investigate the effect of manganese loading on the physicochemical properties of biochar and the mechanism of its catalytic ozonation. It was found that more surface functional groups (CO, Mn-O, etc.) and defects (ID/IG = 1.27) were exposed via the change of original carbon structure by loading Mn, which is conducive to the generation of lattice oxygen. Meanwhile, generating different valence states of Mn metal can improve the redox properties and electron migration rate, and encourage the production of reactive oxygen species (ROS) during the reaction process and enhance the catalytic efficiency. The synergistic action of microorganisms, especially denitrifying bacteria, was found to play a key role in the degradation of nitrogenous pollutants during the activated sludge process. The concentration of NH+4-N was reduced from the initial 1087.03 ± 9.56 mg/L to 9.05 ± 1.91 mg/L, while COD was reduced from 2290 ± 14.14 mg/L to 86.5 ± 2.12 mg/L, with corresponding removal rates of 99.17% and 99.20%, respectively. This method offers high efficiency and stability, achieving discharge standards for leachate (GB16889-2008). The synergy between Mn-loaded biochar and microorganisms in the activated sludge is key to effective treatment. This study offers a new approach to solving the challenge of waste leachate treatment.
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Affiliation(s)
- Bo Gao
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
| | - Jingyao Zhang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Jiadong Liu
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Ali Ayati
- EnergyLab, ITMO University, 9 Lomonosova Street, Saint Petersburg, 191002, Russia
| | - Mika Sillanpää
- Department of Biological and Chemical Engineering, Aarhus University, Nørrebrogade 44, 8000, Aarhus C, Denmark; Functional Materials Group, Gulf University for Science and Technology, Mubarak Al-Abdullah, 32093, Kuwait; School of Technology, Woxsen University, Hyderabad, Telangana, India
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Peng Y, Xue C, Luo J, Zheng B, Fang Z. Lanthanum-doped magnetic biochar activating persulfate in the degradation of florfenicol. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 916:170312. [PMID: 38278274 DOI: 10.1016/j.scitotenv.2024.170312] [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: 10/18/2023] [Revised: 01/18/2024] [Accepted: 01/18/2024] [Indexed: 01/28/2024]
Abstract
In this study, lanthanum-doped magnetic biochar (LaMBC) was synthesized from bagasse by co-doping iron salt and lanthanum salt, and it was characterized for its application in the activation of persulfate (PS) in the degradation of Florfenicol (FLO). The results indicated that the LaMBC/PS system consistently achieved a degradation efficiency of over 99.5 %, with a reaction rate constant 4.71 times as that of MBC. The mechanism of FLO degradation suggested that O2•- and •OH played dominant roles, contributing 40.92 % and 36.96 %, respectively, during FLO degradation. Through physicochemical characterization and quenching experiments, it can be concluded that the key reasons for the enhancement of MBC activation performance are as follows: (1) Lanthanum doping in magnetized biochar increased the Fe(II) content in MBC. (2) Lanthanum doping significantly improved the adsorption capacity of LaMBC, increased the concentration of pollutants on the catalyst surface and effectively enhancing the reaction rate. (3) Lanthanum doping effectively increased the surface Fe(II) content during the reaction process in LaMBC, promoted the generation of active oxygen species in PS. This study delves into synthesizing and applying LaMBC for PS activation and FLO removal. The emphasis is on comprehensively characterizing and experimenting to elucidate the mechanism, proposing an innovative approach for efficiently degrading antibiotic wastewater.
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Affiliation(s)
- Yifu Peng
- School of Environment, South China Normal University, Guangzhou 510006, China; Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd, Qingyuan 511500, China; SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, China
| | - Chengjie Xue
- School of Environment, South China Normal University, Guangzhou 510006, China
| | - Jiayi Luo
- Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd, Qingyuan 511500, China; SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, China
| | - Bin Zheng
- School of Environment, South China Normal University, Guangzhou 510006, China; Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd, Qingyuan 511500, China
| | - Zhanqiang Fang
- School of Environment, South China Normal University, Guangzhou 510006, China; Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd, Qingyuan 511500, China.
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Gong J, Jiang H, Li X, Cheng H, Wang Z, Cai J, Li M, Wang P, Wang H, Hu X, Hu X. Highly efficient activation of periodate by a manganese-modified biochar to rapidly degrade methylene blue. ENVIRONMENTAL RESEARCH 2024; 241:117657. [PMID: 37980988 DOI: 10.1016/j.envres.2023.117657] [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: 06/12/2023] [Revised: 10/25/2023] [Accepted: 11/11/2023] [Indexed: 11/21/2023]
Abstract
In this study, the manganese oxide/biochar composites (Mn@BC) were synthesized from Phytolacca acinosa Roxb. The Mn@BC was analyzed via techniques of Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction analysis (XRD). The results show that MnOx is successfully loaded on the surface of BC, and the load of MnOx can increase the number of surface functional groups of BC. X-ray photoelectron spectroscopy (XPS) shows that MnOx loaded on BC mainly exists in three valence forms: Mn(Ⅱ), Mn(Ⅲ), and Mn(Ⅳ). The ability of Mn@BC to activate periodate (PI) was studied by simulating the degradation of methylene blue (MB) dye. The degradation experiment results showed that the MB removal rate by the Mn@BC/PI system reached 97.4% within 30 min. The quenching experiment and electron paramagnetic resonance (EPR) analysis confirmed that Mn@BC can activate PI to produce iodate (IO3•), singlet oxygen (1O2), and hydroxyl radical (•OH), which can degrade MB during the reaction. Response surface methodology (RSM) based on Box-Behnken Design (BBD) was used to determine the interaction between pH, Mn@BC and PI concentration in the Mn@BC/PI system, and the optimum technological parameters were determined. When pH = 5.4, Mn@BC concentration 0.56 mg/L, PI concentration 1.1 mmol/L, MB removal rate can reach 98.05%. The cyclic experiments show that Mn@BC can be reused. After four consecutive runs, the removal rate of MB by the Mn@BC/PI system is still 82%, and the Mn@BC/PI system also shows high performance in treating MB in actual water bodies and degrading other pollutants. This study provides a practical method for degrading dyes in natural sewage.
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Affiliation(s)
- Jiamin Gong
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
| | - Honghui Jiang
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
| | - Xiang Li
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
| | - Hao Cheng
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
| | - Ziqi Wang
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
| | - Jingju Cai
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
| | - Meifang Li
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
| | - Ping Wang
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
| | - Hui Wang
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China.
| | - Xi Hu
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China.
| | - Xinjiang Hu
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
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Kang K, Hu Y, Khan I, He S, Fetahi P. Recent advances in the synthesis and application of magnetic biochar for wastewater treatment. BIORESOURCE TECHNOLOGY 2023; 390:129786. [PMID: 37758029 DOI: 10.1016/j.biortech.2023.129786] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/23/2023] [Accepted: 09/12/2023] [Indexed: 10/03/2023]
Abstract
Magnetic biochar (MBC) is a novel bio-carbon material with both desired properties as adsorbent and magnetic characteristics. This review provides an up-to-date summary and discussion on the latest development of MBC, which covers the progress on its synthesis, application, and techno-economic analysis. The review indicates that the direct hydrothermal synthesis has been catching more research attention to produce MBC due to its mild reaction conditions. Instead of the Fe-loaded MBC, there is a trend of using Mn for the magnetization. For the MBC application, how to improve its adsorption performance for water decontamination, ideally to match that of the biochar (BC) or activated carbon, is important. In addition, more studies on the environmental impacts of MBC and life-cycle assessment decoding the process optimization options are necessary. This review will provide valuable references for the development of MBC and MBC-based materials for wastewater treatment.
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Affiliation(s)
- Kang Kang
- Biorefining Research Institute (BRI) and Chemical Engineering Department, Lakehead University, Thunder Bay, Ontario, P7B 5E1, 955 Oliver Road, Canada
| | - Yulin Hu
- Faculty of Sustainable Design Engineering, University of Prince Edward Island, Charlottetown PE C1A 4P3, Prince Edward Island, Canada
| | - Iltaf Khan
- Biorefining Research Institute (BRI) and Chemical Engineering Department, Lakehead University, Thunder Bay, Ontario, P7B 5E1, 955 Oliver Road, Canada
| | - Sophie He
- Department of Engineering, Dalhousie University, Truro, NS B2N 5E3, Canada
| | - Pedram Fetahi
- Biorefining Research Institute (BRI) and Chemical Engineering Department, Lakehead University, Thunder Bay, Ontario, P7B 5E1, 955 Oliver Road, Canada.
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