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Title: Improved biogas production from rice straw by co-digestion with kitchen waste and pig manure

Highlights: • Biogas production was enhanced by co-digestion of rice straw with other materials. • The optimal ratio of kitchen waste, pig manure and rice straw is 0.4:1.6:1. • The maximum biogas yield of 674.4 L/kg VS was obtained. • VFA inhibition occurred when kitchen waste content was more than 26%. • The dominant VFA were propionate and acetate in successful reactors. - Abstract: In order to investigate the effect of feedstock ratios in biogas production, anaerobic co-digestions of rice straw with kitchen waste and pig manure were carried out. A series of single-stage batch mesophilic (37 ± 1 °C) anaerobic digestions were performed at a substrate concentration of 54 g/L based on volatile solids (VS). The results showed that the optimal ratio of kitchen waste, pig manure, and rice straw was 0.4:1.6:1, for which the C/N ratio was 21.7. The methane content was 45.9–70.0% and rate of VS reduction was 55.8%. The biogas yield of 674.4 L/kg VS was higher than that of the digestion of rice straw or pig manure alone by 71.67% and 10.41%, respectively. Inhibition of biogas production by volatile fatty acids (VFA) occurred when the addition of kitchen waste was greater than 26%. The VFAmore » analysis showed that, in the reactors that successfully produced biogas, the dominant intermediate metabolites were propionate and acetate, while they were lactic acid, acetate, and propionate in the others.« less
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ;  [1] ; ;  [1]
  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640 (China)
  2. (China)
  3. School of Environmental Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275 (China)
Publication Date:
OSTI Identifier:
22300338
Resource Type:
Journal Article
Resource Relation:
Journal Name: Waste Management; Journal Volume: 33; Journal Issue: 12; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; 09 BIOMASS FUELS; ACETATES; ANAEROBIC DIGESTION; CONCENTRATION RATIO; INHIBITION; LACTIC ACID; MANURES; METABOLITES; METHANE; RICE; SOLIDS; STRAW; SUBSTRATES; SWINE; VOLATILITY