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Management of various organic fractions of municipal solid waste via recourse to VFA and biogas generation

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Title Management of various organic fractions of municipal
solid waste via recourse to VFA and biogas generation
 
Creator Khardenavis, Anshuman
Wang, Jing Yuan
Ng, Wun Jern
PurohiT, H J
 
Subject Solid Waste Treatment & Disposal
Waste Utilization
Environmental Biotechnology
Microbiology
 
Description A hybrid anaerobic solid–liquid system was used for anaerobic digestion of organic fraction of municipal solid waste
(OFMSW) consisting of mixed food+fruit waste and vegetable waste. Hydrolysis and acidogenesis potential of the above
wastes were evaluated with the aim of producing value-added products in the form of volatile fatty acids (VFAs) and biogas
recovery. Efficient hydrolysis and acidogenesis of mixed food+fruit waste was observed at a hydraulic retention time (HRT)
of 1–3 d with a five-fold increase in soluble chemical oxygen demand (SCOD) followed by VFA production consisting
of 50–75% acetic acid. Longer time was required for hydrolysis of vegetable waste with optimum hydrolysis and SCOD
generation at 9 d HRT followed by VFA synthesis consisting of 45% acetic acid. Higher inoculum:substrate ratios resulted
in improved hydrolysis and acidogenesis rates for vegetable waste in shorter time of 6 d with higher VFA production and
increase in acetic acid content to 70%. When acidogenic leachate was fed into methanogenic reactors, detectable biogas
production was observed after 25 d with 37–53% SCOD removal from leachate from mixed food+fruit waste and methane
production of 0.066–0.1 L g−1 SCOD removed and methane content of 38%. Though biogas yield from acidogenic leachate
from vegetable waste was lower, nearly 94% volatile solids (VS) removal was observed in the reactors thereby providing
methane yield of 0.13–0.21 L g−1 VS consumed. Thus, the study provided a method for generation of value-added products
from an otherwise misplaced resource in the form of OFMSW.
 
Publisher Taylor and Francis
 
Date 2013
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/786/1/MSW%20Biogas_Enviro%20Tech.pdf
Khardenavis, Anshuman and Wang, Jing Yuan and Ng, Wun Jern and PurohiT, H J (2013) Management of various organic fractions of municipal solid waste via recourse to VFA and biogas generation. Environmental Technology, 34 (13-14). pp. 2085-2097. ISSN 0959-3330 Online ISSN: 1479-487X
 
Relation http://www.tandfonline.com/toc/tent20/current
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