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Wang D.,Chongqing University | Guo X.,Chongqing University | Gu L.,Chongqing University | He Q.,Chongqing University | And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014

Based on the characteristics of high organic matter content and C/N ratio of restaurant garbage leachate in the Chongqing area and low heat value and C/N ratio of sewage sludge, co-digestion of sewage sludge and garbage leachate was investigated to overcome the disadvantages of the treatment of sewage sludge and garbage leachate. The results showed that the addition of restaurant garbage leachate enhanced both the biogas production and the removal rate of VS.After the addition of vegetable biomass waste and decomposed kitchen waste, the cumulative methane production for addition of leachate of vegetable biomass waste and decomposed kitchen waste were 542 and 2102 mL, respectively, and the corresponding yields were 675.8 and 971.0 L·kg-1 VS, 1.2 and 4.6 times the digestion of sludge without leachate (reference sample), respectively.The addition of leachate also enhanced the removal of VS/TS, 15.3% for vegetable waste addition while 26.3% for restaurant garbage leachate addition.The SCOD concentration after digestion varied from 367 mg·L-1 to 408 mg·L-1, and additions of leachates hardly affected the quality of effluent. These results revealed that kitchen waste leachate would be a potential additive in anaerobic digestion to improve the biodegradability of sludge and promote biogas production.

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