Journal
BIORESOURCE TECHNOLOGY
Volume 195, Issue -, Pages 83-88Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.06.128
Keywords
Two-stage anaerobic treatment; Pre-treatment; Pre-fermentation; Microbial electrolysis cell
Funding
- SERDP [ER-2239]
- NSF-CBET [1335884]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1335884] Funding Source: National Science Foundation
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The aim of this study was to investigate the combination of two technologies - pulsed electric field (PEF) pre-treatment and semi-continuous pre-fermentation of primary sludge (PS) - to produce volatile fatty acids (VFAs) as the electron donor for microbial electrolysis cells (MECs). Pre-fermentation with a 3-day solids retention time (SRT) led to the maximum generation of VFAs, with or without pretreatment of the PS through pulsed-electric-fields (PEF). PEF treatment before fermentation enhanced the accumulation of the preferred VFA, acetate, by 2.6-fold. Correspondingly, MEC anodes fed with centrate from 3-day pre-fermentation of PEF-treated PS had a maximum current density similar to 3.1 A/m(2), which was 2.4-fold greater than the control pre-fermented centrate. Over the full duration of batch MEC experiments, using pre-fermented centrate led to successful performance in terms of Coulombic efficiency (95%), Coulombic recovery (80%), and COD-removal efficiency (85%). (C) 2015 Elsevier Ltd. All rights reserved.
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