Journal
BIORESOURCE TECHNOLOGY
Volume 157, Issue -, Pages 120-126Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.01.056
Keywords
Microbial desalination cell (MDC); Dewatered sludge; Desalination; Electricity generation; Biocathodes
Funding
- Funds for Creative Research Groups [51378144, 51206036, 51121062]
- National Nature Science Foundation of China
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2013DX04]
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Microbial desalination cells (MDCs) with common liquid anodic substrate exhibit a slow startup and destructive pH drop, and abiotic cathodes have high cost and low sustainability. A biocathode MDC with dewatered sludge as fuel was developed for synergistic desalination, electricity generation and sludge stabilization. Experimental results indicated that the startup period was reduced to 3 d, anodic pH was maintained between 6.6 and 7.6, and high stability was shown under long-term operation (300 d). When initial NaCl concentrations were 5 and 10 g/L, the desalinization rates during stable operation were 46.37 +/- 1.14% and 40.74 +/- 0.89%, respectively. The maximum power output of 3.178 W/m(3) with open circuit voltage (OCV) of 1.118 V was produced on 130 d. After 300 d, 25.71 +/- 0.15% of organic matter was removed. These results demonstrated that dewatered sludge was an appropriate anodic substrate to enhance MDC stability for desalination and electricity generation. (C) 2014 Elsevier Ltd. All rights reserved.
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