期刊
BIORESOURCE TECHNOLOGY
卷 237, 期 -, 页码 240-248出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.03.038
关键词
Photo-microbial fuel cells; Wastewater; Nutrients recovery; Microalgae; Spirulina
资金
- Italian Ministry of University and Research (MIUR), within the SIR Grant [RBSI14JKU3]
Spirulina was cultivated in cathodic compartments of photo-microbial fuel cells (P-MFC). Anodic compartments were fed with swine-farming wastewater, enriched with sodium acetate (2.34 g(COD) L-1). Photosynthetic oxygen generation rates were sufficient to sustain cathodic oxygen reduction, significantly improving P-MFC electrochemical performances, as compared to water-cathode control experiments. Power densities (0.8-1Wm(2)) approached those of air-cathode MFCs, run as control. COD was efficiently removed and only negligible fractions leaked to the cathodic chamber. Spirulina growth rates were comparable to those of control (MFC-free) cultures, while pH was significantly (0.5-1 unit) higher in P-MFCs, due to cathodic reactions. Alkaliphilic photosynthetic microorganisms like Spirulina might take advantage of these selective conditions. Electro-migration along with diffusion to the cathodic compartment concurred for the recovery of most nutrients. Only P and Mg were retained in the anodic chamber. A deeper look into electro-osmotic mechanisms should be addressed in future studies. (C) 2017 Elsevier Ltd. All rights reserved.
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