title: Competitive migration behaviors of multiple ions and their impacts on ion-exchange resin packed microbial desalination cell.
abstract: Mixed ion-exchange resins packed microbial desalination cell (R-MDC) could stabilize the internal resistance, however, the impacts of multiple ions on R-MDC performance was unclear. This study investigated the desalination performance, multiple ions migration behaviors and their impacts on R-MDCs fed with salt solution containing multiple anions and cations. Results showed that R-MDC removed multiple anions better than multiple cations with desalination efficiency of 99% (effluent conductivity <0.05 ms/cm) at hydraulic retention time of 50 h. Competitive migration order was SO4(2-)>NO3(-)>Cl(-) for anions and Ca(2+)≈Mg(2+)>NH4(+)>Na(+) for cations, jointly affected by both their molar conductivity and exchange selectivity on resins. After long-term operation, the existence of higher concentration Ca(2+) and Mg(2+) caused the electric conductivity of mixed resins decrease and scaling on the surface of cation-exchange membrane adjoined with cathode chamber, suggesting that R-MDC would be more suitable for desalination of water with lower hardness.
authors: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors: Kuichang
authors: K
authors: Zuo
authors: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors: Lulu
authors: L
authors: Yuan
authors: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors: Jincheng
authors: J
authors: Wei
authors: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China. Electronic address: liangpeng@tsinghua.edu.cn.
authors: Peng
authors: P
authors: Liang
authors: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China. Electronic address: xhuang@tsinghua.edu.cn.
authors: Xia
authors: X
authors: Huang
mesh_terms: D001673:Biodegradation, Environmental; D001674:Bioelectric Energy Sources; D019149:Bioreactors; D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D007475:Ion Exchange Resins; D007477:Ions; D015233:Models, Statistical; D054712:Salinity; D012492:Salts / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions; D013997:Time Factors; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
chemical_list: D007475:Ion Exchange Resins; D007477:Ions; D012492:Salts; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D012965:Sodium Chloride
keywords: Ion-exchange resin; Microbial desalination cell; Migration behavior; Multiple ions; Scaling