title: Bioelectricity generation and dewatered sludge degradation in microbial capacitive desalination cell.
abstract: Microbial desalination cell (MDC) is a new approach for the synergy in bioelectricity generation, desalination and organic waste treatment without additional power input. However, current MDC systems cause salt accumulation in anodic wastewater and sludge. A microbial capacitive desalination cell (MCDC) with dewatered sludge as anodic substrate was developed to address the salt migration problem and improve the sludge recycling value by special designed-membrane assemblies, which consisted of cation exchange membranes (CEMs), layers of activated carbon cloth (ACC), and nickel foam. Experimental results indicated that the maximum power output of 2.06 W/m3with open circuit voltage (OCV) of 0.942 V was produced in 42 days. When initial NaCl concentration was 2 g/L, the desalinization rate was about 15.5 mg/(L·h) in the first 24 h, indicating that the MCDC reactor was suitable to desalinize the low concentration salt solution rapidly. The conductivity of the anodic substrate decreased during the 42-day operation; the CEM/ACC/Ni assemblies could effectively restrict the salt accumulation in MCDC anode and promote dewatered sludge effective use by optimizing the dewatered sludge properties, such as organic matter, C/N, pH value, and electric conductivity (EC).
authors.affiliation: Department of Environmental Hygiene, School of Public Health, Harbin Medical University, Harbin, 150081, China.
authors.forename: Fanyu
authors.initials: F
authors.lastname: Meng
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China. qlzhao@hit.edu.cn.|State Key Laboratory of Urban Water Resources and Environments (SKLUWRE), Harbin Institute of Technology, Harbin, 150090, China. qlzhao@hit.edu.cn.
authors.forename: Qingliang
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Department of Environmental Hygiene, School of Public Health, Harbin Medical University, Harbin, 150081, China. naxiaolin1495@hotmail.com.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Na
authors.affiliation: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zheng
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China.
authors.forename: Junqiu
authors.initials: J
authors.lastname: Jiang
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China.
authors.forename: Liangliang
authors.initials: L
authors.lastname: Wei
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
mesh_terms: D001419:Bacteria; D001674:Bioelectric Energy Sources; D002606:Charcoal; D004553:Electric Conductivity; D004566:Electrodes; D012722:Sewage; D012965:Sodium Chloride; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D002606:Charcoal; D012722:Sewage; D012965:Sodium Chloride; D062065:Wastewater
keywords: Desalination; Dewatered sludge degradation; Electricity generation; Electrode performance; Microbial capacitive desalination cell (MCDC); Soluble organic matter