Enhanced hydrogen production in microbial electrolysis through strategies of carbon recovery from alkaline/thermal treat
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RESEARCH ARTICLE
Enhanced hydrogen production in microbial electrolysis through strategies of carbon recovery from alkaline/thermal treated sludge Ling Wang
1*
, Chunxue Yang 2*, Sangeetha Thangavel3, Zechong Guo4, Chuan Chen1, Aijie Wang1,5, Wenzong Liu (✉)5
1 State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China 2 Heilongjiang Cold Region Wetland Ecology and Environment Research Key Laboratory, School of Geography and Tourism, Harbin University, Harbin 150086, China 3 Department of Energy and Refrigerating Air-Conditioning Engineering, Taipei University of Technology, Taipei 10608, China 4 School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212013, China 5 School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, China
HIGHLIGHTS
GRAPHIC ABSTRACT
• High hydrogen yield is recovered from thermalalkaline pretreated sludge. • Separating SFL by centrifugation is better than filtration for hydrogen recovery. • The cascaded bioconversion of complex substrates in MECs are studied. • Energy and electron efficiency related to substrate conversion are evaluated.
ARTICLE INFO Article history:
Received 10 April 2020 Revised 5 July 2020 Accepted 10 August 2020 Available online 10 October 2020 Keywords: Waste activated sludge (WAS) Short chain fatty acids (SCFAs) Hydrogen Pretreatment Microbial electrolysis cells (MECs)
1
ABSTRACT 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 3 (MECs) without buffer addition. Highest hydrogen yield of 36.874.36 mgH2/gVSS (0.026 m /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.
Introduction
Biohydrogen production from waste biomass has become
✉ Corresponding author E-mail: [email protected] *
These authors contributed equally to this work.
© Higher Education Press 2020
an alternative choice for sustainable green-energy development (Duan et al., 2019). Currently, hydrogen energy is regarded as a cost-effective clean energy, compared to the fossil fuels du
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