期刊
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
卷 15, 期 4, 页码 -出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s11783-020-1348-4
关键词
Waste activated sludge (WAS); Short chain fatty acids (SCFAs); Hydrogen; Pretreatment; Microbial electrolysis cells (MECs)
资金
- National Natural Science Foundation of China [51778607]
- Natural Science Fundation of Heilongjiang Province, China [LH2019E071]
This study investigated biohydrogen production from pretreated sludge fermentation liquid in microbial electrolysis cells without buffer addition. The highest hydrogen yield was achieved in TA pretreated SFL separated by centrifugation. Pretreated sludge stimulated the accumulation of SCFAs, which were the main substrates for MEC hydrogen production.
The aim of this study was to investigate the biohydrogen production from thermal (T), alkaline (A) or thermal-alkaline (TA) pretreated sludge fermentation liquid (SFL) in a microbial electrolysis cells (MECs) without buffer addition. Highest hydrogen yield of 36.87 +/- 4.36 mg H-2/gVSS (0.026 m(3)/kg COD) was achieved in TA pretreated SFL separated by centrifugation, which was 5.12, 2.35 and 43.25 times higher than that of individual alkaline, thermal pretreatment and raw sludge, respectively. Separating SFL from sludge by centrifugation eliminated the negative effects of particulate matters, was more conducive for hydrogen production than filtration. The accumulated short chain fatty acid (SCFAs) after pretreatments were the main substrates for MEC hydrogen production. The maximum utilization ratio of acetic acid, propionic acid and n-butyric acid was 93.69%, 90.72% and 91.85%, respectively. These results revealed that pretreated WAS was highly efficient to stimulate the accumulation of SCFAs. And the characteristics and cascade bioconversion of complex substrates were the main factor that determined the energy efficiency and hydrogen conversion rate of MECs. (c) Higher Education Press 2020
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