Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (1): 98-105.doi: 10.19741/j.issn.1673-4831.2018.0253

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Study on Performance Anaerobic Mono-digestion/Co-digestion of Different Agro-industrial Wastes Using Chicken Feces as Main Substrate

CHEN Xu, YAN Yong-qing   

  1. College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin 150030, China
  • Received:2018-05-07 Online:2019-01-25 Published:2019-01-22
  • Contact: 35 E-mail:363101858@qq.com

Abstract:

The methane production potential and kinetic features of anaerobic digestion/co-digestion of five different agro-industrial wastes including chicken feces, food waste, cheese whey, corn stover and hay grass were studied in batch mode. With various VS contents of 2%, 3%, 4% and 5%, the maximum methane production potentials obtained during batch tests from high to low were cheese whey, food waste, corn stover, hay grass and chicken feces. The corresponding maximum cumulative methane production could be achieved to be 1 270.9 (5%), 1 113.6 (5%), 646.7 (2%), 645.0 (2%) and 364.7 mL·g-1 (4%) VS, respectively. The experimental results obtained from anaerobic digestion of different agro-industrial wastes could be well fitted to modified Gompertz model (R2=0.961-0.990), indicating that modified Gompertz model is suitable for evaluating the characteristics of anaerobic digestion of single substrate in this study. The predictive values were able to be used to evaluate the feasibility of anaerobic co-digestion of chicken feces with other substrates. Based on the predictive values from modified Gompertz model, the anaerobic co-digestion tests were designed and undertaken by blending chicken feces as main substrate with one, two or three other kinds of substrates among cheese whey, corn stover and hay grass. The optimized C/N ratio could effectively decrease lag phase and improve methane production potential of anaerobic digestion of chicken feces. Methane production was improved by 52.2%-112.9%, compared with that of anaerobic mono-digestion of chicken feces. The highest methane production potential was observed at a C/N ratio of 28.02 with 50% chicken feces and 50% cheese whey.

Key words: agro-industrial waste, anaerobic digestion, methane

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