Effects of draw solutions and membrane conditions on electricity generation and water flux in osmotic microbial fuel cells

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• 作者：Zheng Ge ; Zhen He ; ^{zhenhe@uwm.edu}
• 关键词：Forward osmosis ; Osmotic microbial fuel cell ; Wastewater treatment ; Water flux ; Draw solution
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：April, 2012
• 卷：109
• 期：Complete
• 页码：70-76
• 文件大小：693 K

摘要

This study provided an early effort to investigate the draw solutions as catholytes, FO membrane conditions, and backwash for membrane cleaning in an osmotic microbial fuel cell (OsMFC). The results demonstrated that sodium chloride was a suitable candidate as a catholyte solute with good performance in both electricity generation and water flux, although its pH required buffering via acid addition. Adding a small amount of hydrochloric acid decreased the catholyte pH from 9.0 to 2.5 and increased the current generation by 50%, but did not affect water flux. It was also found that the fouled FO membrane improved electricity generation but lost the function of water flux. The damaged FO membrane resulted in a water flux of 0.39 LMH, much lower than 2-3 LMH with a new FO membrane. Backwash with adding NaCl (0.2-0.5 M) into the anolyte was examined but did not obviously alleviate membrane fouling.