Microbial electrolysis enhanced bioconversion of waste sludge lysate for hydrogen production compared with anaerobic digestion

Zhe Yu, Wenzong Liu*, Yingjun Shi, Bo Wang, Cong Huang, Chunshuang Liu, Aijie Wang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Waste sludge lysate was produced by dehydration after pyrolysis of waste activated sludge. In addition to dominant components such as protein, polysaccharide, and volatile fatty acids (VFAs), it also contained melanoidins, which produced from Maillard reaction. The inclusion of melanoidins will lead to poor biological degradation in conventional anaerobic digestion (AD). While microbial electrolysis cell (MEC) was proved an enhanced degradation of complex organic matter for hydrogen production. The results showed that under high concentration conditions, conventional AD caused the accumulation of propionic acid and slowed down the use of acetic acid, but MEC overcame the defects and increased the chemical oxygen demand (COD) removal efficiency by 40.33%, and achieved average hydrogen production rate (0.15 ± 0.05 L L-1 day-1), which was 79 times that of AD system (0.0019 ± 0.0009 L L-1 day-1). Therefore, MEC can enhanced biodegradation of the waste sludge lysate for high hydrogen production.

Original languageEnglish
Article number144344
JournalThe Science of the Total Environment
Volume767
Number of pages7
ISSN0048-9697
DOIs
Publication statusPublished - 2021

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