Energy recovery from agro-industrial wastewaters through biohydrogen production: Kinetic evaluation and technological feasibility

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DOIResolve DOI: http://doi.org/10.1016/j.renene.2014.10.025
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TypeArticle
Journal titleRenewable Energy
ISSN0960-1481
Volume75
Pages496504; # of pages: 9
SubjectBatch reactors; Biogeochemistry; Biological materials; Chemical oxygen demand; Degradation; Enzyme kinetics; Industrial economics; Industrial wastes; Kinetics; Organic compounds; Agro-industrial wastes; Bio-hydrogen production; Citrus processing; Industrial wastewaters; Kinetic evaluations; Technological feasibility; Hydrogen production; agroindustry; bioenergy; biofuel; biotechnology; cassava; dairy farming; economic analysis; feasibility study; hydrogen; reaction kinetics; renewable resource; wastewater
AbstractBiohydrogen production from cassava, dairy and citrus processing wastewaters (WWs) without nutritional supplementation was evaluated in anaerobic single-batch reactors at 37°C for 70h. Hydrogen production from cassava, dairy and citrus WW was 31.41, 37.25 and 28.95mLg-1 of chemical oxygen demand (COD). The kinetic parameters indicated that H2 production rates for cassava processing WW (0.32mLh-1) and dairy WW (0.31mLh-1) were similar, whereas citrus processing WW exhibited the highest value (0.59mLh-1). The carbohydrate degradation rate (k1App) was highest for dairy WW (0.045h-1), but the most efficient overall conversion of organic matter to H2(k2App) was observed with cassava WW (0.014h-1). The rate of conversion of the organic matter of the cassava WW together with its ready availability resulted in a recovery of 0.59 109MJyear-1, the highest in this study. Cassava WW showed the highest hydrogen production potential (97.9mL), when compared with dairy (76.1mL) and citrus WW (66.6mL). The economic estimation based on the gasoline energetic equivalent indicated that a single process of H2 production allowed the maximum economic yield of US$ 0.009 cents L-1 WW. Alternatively, a sequential hydrogen and methane process could increase energy recoveries and economic yields to values near 10.48kJg-1 COD and US$ 0.61 cents L-1 WW (US$ 6.10m-3 WW).
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Energy, Mining and Environment
Peer reviewedYes
NPARC number21275814
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Record identifierba58890b-83e0-4604-a5f8-4a51e1a12d9e
Record created2015-07-14
Record modified2016-05-09
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