Effects of pre-fermentation and pulsed-electric-field treatment of primary sludge in microbial electrochemical cells

Dongwon Ki; Prathap Parameswaran; Sudeep C. Popat; Bruce Rittmann; Cesar Torres

doi:10.1016/j.biortech.2015.06.128

Effects of pre-fermentation and pulsed-electric-field treatment of primary sludge in microbial electrochemical cells

Dongwon Ki, Prathap Parameswaran, Sudeep C. Popat, Bruce Rittmann, Cesar Torres

Research output: Contribution to journal › Article

27 Scopus citations

Abstract

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 ∼3.1 A/m², 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%).

Original language	English (US)
Pages (from-to)	83-88
Number of pages	6
Journal	Bioresource Technology
Volume	195
DOIs	https://doi.org/10.1016/j.biortech.2015.06.128
State	Published - May 1 2015

Keywords

Microbial electrolysis cell
Pre-fermentation
Pre-treatment
Two-stage anaerobic treatment

ASJC Scopus subject areas

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

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Ki, D., Parameswaran, P., Popat, S. C., Rittmann, B., & Torres, C. (2015). Effects of pre-fermentation and pulsed-electric-field treatment of primary sludge in microbial electrochemical cells. Bioresource Technology, 195, 83-88. https://doi.org/10.1016/j.biortech.2015.06.128

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AU - Torres, Cesar

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