Journal
JOURNAL OF CLEANER PRODUCTION
Volume 168, Issue -, Pages 1143-1149Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.09.107
Keywords
Osmotic microbial fuel cells; Polyelectrolyte; Draw solute reproduction; pH responsive; Water treatment
Categories
Funding
- faculty startup fund of Virginia Tech
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions [1105007002]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1647]
- Innovation Program for Academic Degree of Graduate Student of Jiangsu Province [KYLX16 0249]
- Fundamental Research Funds for the Central Universities [3205007451]
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Osmotic microbial fuel cells (OsMFCs) take advantages of synergy between forward osmosis (FO) and microbial fuel cells (MFCs) for simultaneous wastewater treatment, bioenergy production, and water recovery. A unique feature for healthy operation of OsMFCs is an appropriate draw solute (DS) that can also act as a catholyte. Herein, polyelectrolytes (polyacrylic acid sodium salts, PAA-Na) was investigated as a DS/catholyte and reproduced with the aid of the high catholyte pH. Such a reproduction method is innovative, because it turns a drawback (high catholyte pH) into a useful resource, thereby reducing the demand for external input and leading to a clean production process. The results have showed that the OsMFC achieved a current density of 159 +/- 6 A m(-3), water flux of 12.7 +/- 0.2 LMH, and low reverse salt flux of 0.05 +/- 0.00 gMH with 32 wt% PAA-Na (2000 Da) as the DS. The DS recovery efficiency could be as high as 99.86 +/- 0.04%, and the reproduced DS was successfully applied in the subsequent operation. With this reproduction method, the highest total operation cost was estimated at 0.104 $ m(-3). Those results have demonstrated a new approach based on pH-dependent PAA DS reproduction towards further development of OsMFC technology for sustainable water/wastewater treatment and resource recovery. (C) 2017 Elsevier Ltd. All rights reserved.
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