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- Title
Comparing two enhancing methods for improving kitchen waste anaerobic digestion: Bentonite addition and autoclaved de-oiling pretreatment.
- Authors
Zhang, Duojiao; Duan, Na; Tian, Hailin; Lin, Cong; Zhang, Yilin; Liu, Zhidan
- Abstract
• Two enhancing methods for KW mono-digestion were comparative studied. • Enhanced 17.7% methane production with adding bentonite at OLR of 1.39 gVSL−1 d−1. • Two methods showed positive effect on CH 4 production and stability at low OLR. • Showed application potential for a KW biogas plant adding bentonite. The effects of different enhancement methods, including adding bentonite (1.25%, w/w, wet substrate) and autoclaved de-oiling pretreatment (121 °C, 30 min), on the anaerobic digestion of kitchen waste (KW) were comparably studied. Mesophilic continuous stirred tank reactors were used under different organic loading rates (OLRs) of 1.11–1.84 gVS (volatile solid)L−1 d−1 and two different hydraulic retention times (HRTs) (20 d and 25 d). In this study, two enhancement methods and extending HRT could prevent volatile fatty acids (VFA) accumulation and obtain a high methane production at low OLR. Owing to the effect of providing nutrients and buffering capacity, the maximum methane yield was obtained with adding bentonite at OLR of 1.39 gVSL−1 d−1. However, for high OLR (1.84 gVSL−1 d−1), a decrease of the methane yield and system breakdown occurred due to the accumulation of VFAs. Engineering design and process evaluation of a CSTR biogas plant treating with KW based on the laboratory experiment was stated.
- Subjects
ANAEROBIC digestion; PLANT capacity; BENTONITE; TANKS; KITCHENS; ENGINEERING design; RF values (Chromatography)
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2018, Vol 115, p116
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2017.09.011