An integrated microbial electrolysis-anaerobic digestion process combined with pretreatment of wastewater solids to improve hydrogen production

Beegle, Jeff R.; Borole, Abhijeet P.

doi:10.1039/C7EW00189D

Title: An integrated microbial electrolysis-anaerobic digestion process combined with pretreatment of wastewater solids to improve hydrogen production

Journal Article · 17 August 2017 · Environmental Science: Water Research & Technology

DOI: https://doi.org/10.1039/C7EW00189D · OSTI ID:1376484

Beegle, Jeff R. ^[1]; Borole, Abhijeet P. ^[2]

Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research and Graduate Education. Dept. of Microbiology; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research and Graduate Education. Chemical and Biomolecular Engineering Dept.; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

A combined anaerobic digestion (AD) and microbial electrolysis cell (MEC) system, named here as ADMEC, was investigated in this paper to evaluate the energy recovery from pretreated wastewater solids. Alkaline and thermal hydrolysis pretreatment methods increased the solubility of organic compounds present in the raw solids by 25% and 20%, respectively. The soluble phase from pretreatment was separated and used for microbial electrolysis, whereas the insoluble fraction was fed into semi-continuous digesters. The digester effluent was later utilized as a second MEC substrate. The pretreatment had variable effects on AD and MEC performance. The methane content in AD biogas was higher in pretreated groups, 78.29 ± 2.89% and 73.2 ± 1.79%, for alkaline and thermal, than the control, 50.26 ± 0.53%, but the overall biogas production rates were lower than the control, 20 and 30 mL CH₄ gCOD^-1 d^-1 for alkaline and thermal compared to 80 mL CH₄ gCOD^-1 d^-1. The effluent streams from thermally pretreated digesters were the best substrate for microbial electrolysis, in terms of hydrogen production and efficiency. The MECs produced 1.7 ± 0.2 L-H₂ per L per day, 0.3 ± 0.1 L-H₂ per L per day, and 0.29 ± 0.1 L-H₂ per L per day, for thermal, alkaline, and control reactors. The productivity was lower compared to acetate and propionate controls, which yielded 5.79 ± 0.03 L-H₂ per L per day and 3.49 ± 0.10 L-H₂ per L per day, respectively. The pretreatment solubilized fractions were not ideal substrates for microbial electrolysis. Finally, a chemical oxygen demand (COD) mass balance showed that pretreatment shifts the electron flux away from methane and biomass sinks towards hydrogen production.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1376484

Journal Information:: Environmental Science: Water Research & Technology, Journal Name: Environmental Science: Water Research & Technology Vol. 3; ISSN 2053-1400

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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