Enzymatic pretreatment to enhance anaerobic bioconversion of high strength wastewater to biogas: A review

Liew, Y.X. and Chan, Y.J. and Manickam, S. and Chong, M.F. and Chong, S. and Tiong, T.J. and Lim, J.W. and Pan, G.-T. (2020) Enzymatic pretreatment to enhance anaerobic bioconversion of high strength wastewater to biogas: A review. Science of the Total Environment, 713. ISSN 00489697

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Abstract

Oil and grease, carbohydrate, protein, and lignin are the main constituents of high strength wastewaters such as dairy wastewater, cheese whey wastewater, distillery wastewater, pulp and paper mill wastewater, and slaughterhouse wastewaters. These constituents have contributed to various operational problems faced by the high-rate anaerobic bioreactor (HRAB). During the hydrolysis stage of anaerobic digestion (AD), these constituents can be hydrolyzed. Since hydrolysis is known to be the rate-limiting step of AD, the overall AD can be enhanced by improving the hydrolysis stage. This can be done by introducing pretreatment that targets the degradation of these constituents. This review mainly focuses on the biological pretreatment on various high-strength wastewaters by using different types of enzymes namely lipase, amylase, protease, and ligninolytic enzymes which are responsible for catalyzing the degradation of oil and grease, carbohydrate, protein, and lignin respectively. This review provides a summary of enzymatic systems involved in enhancing the hydrolysis stage and consequently improve biogas production. The results show that the use of enzymes improves the biogas production in the range of 7 to 76. Though these improvements are highly dependent on the operating conditions of pretreatment and the types of substrates. Therefore, the critical parameters that would affect the effectiveness of pretreatment are also discussed. This review paper will serve as a useful piece of information to those industries that face difficulties in treating their high-strength wastewaters for the appropriate process, equipment selection, and design of an anaerobic enzymatic system. However, more intensive studies on the optimum operating conditions of pretreatment in a larger-scale and synergistic effects between enzymes are necessary to make the enzymatic pretreatment economically feasible. © 2019 Elsevier B.V.

Item Type: Article
Additional Information: cited By 59
Uncontrolled Keywords: Biogas; Carbohydrates; Enzymes; Hydrolysis; Lignin; Wastewater treatment, Biological; Biological pre-treatment; Enzymatic pretreatment; High strength wastewater; Optimum operating conditions; Pre-Treatment; Pulp and paper mill wastewaters; Slaughterhouse wastewater, Anaerobic digestion, amylase; biogas; carbohydrate; enzyme; laccase; lignin; lignin peroxidase; ligninolytic enzyme; manganese peroxidase; oil; protein; proteinase; triacylglycerol lipase; unclassified drug; biofuel; methane, anaerobic digestion; anoxic conditions; biogas; enzyme; hydrolysis; wastewater treatment, anaerobic bioconversion; anaerobic digestion; biofuel production; biotransformation; catalysis; degradation; dose; enzyme activity; enzyme synthesis; hydrolysis; nonhuman; pH; priority journal; Review; temperature; waste water; waste water management; anaerobic growth; bioreactor; waste water, Biogas; Carbohydrates; Components; Enzymes; Hydrolysis; Pretreatment; Review, Anaerobiosis; Biofuels; Bioreactors; Hydrolysis; Methane; Waste Water
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 10 Nov 2023 03:27
Last Modified: 10 Nov 2023 03:27
URI: https://khub.utp.edu.my/scholars/id/eprint/13242

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