Stacked Microbial Desalination Cells to Enhance Water Desalination Efficiency

被引：175
作者：
Chen, Xi [1 ]
Xia, Xue [1 ]
Liang, Peng [1 ]
Cao, Xiaoxin [1 ]
Sun, Haotian [1 ]
Huang, Xia [1 ]
机构：
[1] Tsinghua Univ, State Key Joint Lab Environm Simulat & Pollut Con, Dept Environm Sci & Engn, Beijing 100084, Peoples R China
来源：
ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2011年 / 45卷 / 06期
关键词：
ELECTRICITY-GENERATION; FUEL-CELLS; ENERGY; RESISTANCE;
D O I：
10.1021/es103406m
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Microbial desalination cell (MDC) is a new method to obtain clean water from brackish water using electricity generated from organic matters by exoelectrogenic bacteria. Anions and cations, derived from salt solution filled in the desalination chamber between the anode and cathode, move to the anode and cathode chambers under the force of electrical field, respectively. On the basis of the primitive single-desalination-chambered MDC, stacked microbial desalination cells (SMDCs) were developed in order to promote the desalination rate in the present study. The effects of desalination chamber number and external resistance were investigated. Results showed that a remarkable increase in the total desalination rate (TDR) could be obtained by means of increasing the desalination cell number and reducing the external resistance, which caused the charge transfer efficiency increased since the SMDCs enabled more pairs of ions separated while one electron passed through the external circuit. The maximum TDR of 0.0252 g/h was obtained using a two-desalination-chambered SMDC with an external resistance of 10 Omega, which was 1.4 times that of single-desalination-chambered MDC. SMDCs proved to be an effective approach to increase the total water desalination rate if provided a proper desalination chamber number and external resistance.
引用
收藏
页码：2465 / 2470
页数：6
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