生态与农村环境学报 ›› 2019, Vol. 35 ›› Issue (1): 98-105.doi: 10.19741/j.issn.1673-4831.2018.0253

• 污染控制与修复 • 上一篇    下一篇

鸡粪等几种农业废弃物厌氧消化性能研究

陈旭, 闫永庆   

  1. 东北农业大学园艺园林学院, 黑龙江 哈尔滨 150030
  • 收稿日期:2018-05-07 出版日期:2019-01-25 发布日期:2019-01-22
  • 通讯作者: 闫永庆 E-mail:363101858@qq.com
  • 作者简介:陈旭(1981-),男,黑龙江肇东人,实验师,硕士,主要从事污染生物修复研究。E-mail:amswwangbing@163.com
  • 基金资助:

    国家自然科学基金(31770437)

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

摘要:

以鸡粪、农村餐厨垃圾、奶酪乳清、玉米秸秆和牧草5种农业废弃物为底物,采用批式方式研究其厌氧消化产气潜力和动力学特性。结果表明,不同VS含量(w分别为2%、3%、4%和5%)条件下,各底物(以VS计)最大产甲烷潜力由高到低依次为奶酪乳清、农村餐厨垃圾、玉米秸秆、牧草和鸡粪,最大累积甲烷产量分别为1 270.9(5%)、1 113.6(5%)、646.7(2%)、645.0(2%)和364.7 mL·g-1(4%)。修正的Gompertz模型与各底物单独厌氧消化结果拟合度高(R2=0.961~0.990),其预测结果可用于评价鸡粪与其他底物厌氧共消化的可行性。基于修正的Gompertz模型预测结果,以鸡粪为主要发酵底物,通过与奶酪乳清、玉米秸秆和牧草进行多底物混合优化C/N,可有效降低鸡粪厌氧消化产甲烷延滞期并提高产甲烷潜力,甲烷产量可提高52.2%~112.9%。鸡粪与奶酪乳清混合比例为50:50(C/N为28.02)时,系统产甲烷潜力最高。

关键词: 农业废弃物, 厌氧消化, 甲烷

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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