title: A combined microbial desalination cell and electrodialysis system for copper-containing wastewater treatment and high-salinity-water desalination.
abstract: A new concept for heavy metal removal by forming hydroxide precipitation using alkalinity produced by microbial desalination cell (MDC) was proposed. Four five-chamber MDCs were hydraulically connected to concurrently produce alkalinity to treat synthetic copper-containing wastewater and salt removal. There was nearly complete removal of copper, with a maximum removal rate of 5.07kg/(m3d) under the initial copper concentration of 5000mg/L (final pH of 7). The final copper concentration met the emission standard for electroplating of China (0.5mg/L, GB 21900-2008). XRD analysis indicated copper was precipitated as Cu2Cl(OH)3. The best performance of MDCs in terms of average power density, salt removal and COD removal rate achieved in stage 3 were 737.3±201.1mW/m2, 53.6±0.8kg/(m3d), and 1.84±0.05 kgCOD/(m3d) respectively. For purposes of water recovery, an electrodialysis (ED) system was presented based on in-situ utilization of generated electricity by MDCs as post-desalination treatment for salt effluent after sedimentation. The maximum discharging voltage of 12.75±1.26V at switching time (Ts) of 15min using a capacitor-based circuit produced a maximum desalination efficiency of 30.4±2.6%. These results indicated that this combined system holds great promise for real-world treatment of copper-containing wastewater and deep desalination of high-salinity-water.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Dong
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: Mingrui
authors.initials: M
authors.lastname: Sui
authors.affiliation: School of Life Science and Technology, Harbin Institute of Technology, No. 2 Yikuang Street, Nangang District, Harbin 150080, China.
authors.forename: Youpeng
authors.initials: Y
authors.lastname: Qu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: John J
authors.initials: JJ
authors.lastname: Ambuchi
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China.
authors.forename: Haiman
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China. Electronic address: yujief@hit.edu.cn.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Feng
mesh_terms: D001673:Biodegradation, Environmental; D001674:Bioelectric Energy Sources; D003300:Copper / Q000032:analysis*; D055664:Electrochemical Techniques / Q000379:methods*; D054712:Salinity; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D003300:Copper; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Alkalinity production; Copper-containing wastewater treatment; High-salinity-water desalination; Microbial desalination cell