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BioMed Research International
Volume 2017 (2017), Article ID 3808521, 7 pages
Research Article

Application of the Initial Rate Method in Anaerobic Digestion of Kitchen Waste

1Liaoning Province Clean Energy Key Laboratory, Shenyang Aerospace University, Shenyang Daoyi Street 37, Shenyang 110136, China
2Liaoning Institute of Energy Resources, 65# Yingquan St., Yingkou, Liaoning, China
3Liaoning Academy of Environmental Sciences, 30# Shuangyuan St., Shenyang, Liaoning 115003, China

Correspondence should be addressed to Wei Kou; moc.621@6iewuok

Received 16 June 2016; Revised 28 November 2016; Accepted 15 December 2016; Published 4 May 2017

Academic Editor: Liandong Zhu

Copyright © 2017 Lei Feng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This article proposes a methane production approach through sequenced anaerobic digestion of kitchen waste, determines the hydrolysis constants and reaction orders at both low total solid (TS) concentrations and high TS concentrations using the initial rate method, and examines the population growth model and first-order hydrolysis model. The findings indicate that the first-order hydrolysis model better reflects the kinetic process of gas production. During the experiment, all the influential factors of anaerobic fermentation retained their optimal values. The hydrolysis constants and reaction orders at low TS concentrations are then employed to demonstrate that the first-order gas production model can describe the kinetics of the gas production process. At low TS concentrations, the hydrolysis constants and reaction orders demonstrated opposite trends, with both stabilizing after 24 days at 0.99 and 1.1252, respectively. At high TS concentrations, the hydrolysis constants and the reaction orders stabilized at 0.98 (after 18 days) and 0.3507 (after 14 days), respectively. Given sufficient reaction time, the hydrolysis involved in anaerobic fermentation of kitchen waste can be regarded as a first-order reaction in terms of reaction kinetics. This study serves as a good reference for future studies regarding the kinetics of anaerobic digestion of kitchen waste.