Bioelectrochemically assisted anaerobic digestion system for biogas upgrading and enhanced methane production

The Science of the Total Environment
Zeou DouSpyros G Pavlostathis

Abstract

The objective of this study was to evaluate the effect of biofilm and external voltage on the performance and microbial community composition of batch-fed, combined anaerobic digestion-bioelectrochemical cell (AD-BEC) systems under different operational conditions. A dextrin/peptone mixture was fed at a range of organic loading rates (0.34 to 1.37g COD/L-d). The hybrid system with both suspended biomass and biofilm without any external potential application achieved a substantially higher initial soluble COD consumption (53.7±2.3% vs. 39.7±3.7) and methane (CH4) production (331 vs. 225mL) within one day of feeding than the conventional AD system (suspended biomass only). Compared to the conventional AD system, the hybrid systems had higher resilience to shock organic loadings. A range of external potential (0.5 to 2.0V vs. Ag/AgCl) was applied to AD-BEC reactors, developed with two different start-up procedures. A potential of 2.0V resulted in water electrolysis leading to a higher CH4 production rate (105 vs. 84mL/L-d) and biogas CH4 content (88.5±1.4 vs. 64.5±1.9%) in the AD-BEC reactor (closed vs. open circuit condition, respectively). Application of external potential enriched putative exoelectrogens at the anode biofilm an...Continue Reading

Citations

Aug 8, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Val S FrenkelWalter Z Tang
Apr 13, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·V CorbelliniF Malpei
Feb 9, 2021·Bioresource Technology·J Shanthi SravanS Venkata Mohan
Aug 21, 2021·The Science of the Total Environment·Xin KongXiuping Yue
Jun 17, 2020·Environmental Science & Technology·Christy M DykstraSpyros G Pavlostathis
Nov 27, 2021·The Science of the Total Environment·Tianyu GaoJiaheng Teng

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