Food and Fermentation Industries >

2020 , Vol. 46 >Issue 19: 92 - 98

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.024411

Continuous anaerobic co-digestion of food waste and excess sludge

  • ZHAO Mingxing ,
  • HUANG Yue ,
  • MIAO Hengfeng ,
  • HUANG Zhenxing ,
  • DAI Xiaohu ,
  • RUAN Wenquan
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  • 1(School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China);
    2(Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi 214122, China);
    3(College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China)

Received date: 2020-05-09

  Revised date: 2020-05-18

  Online published: 2020-11-02

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Abstract

The anaerobic co-digestion technology was used to deal with the food waste and excess sludge. The continuous operation of CSTR reactor was carried out by gradually increasing the organic loading rate, and lasted for 128 days. The results showed that the biogas yield, methane yield and system stability were various under different organic loading rates. The value of pH, VFA and the content of ammonia nitrogen decreased with the increase of reaction loading rate, while the activities of proteases, amylases and dehydrogenases were fluctuated during the reaction process. When the organic loading rate of the reactor was 2.5, 5.0, 7.5 and 10 g VS/(L·d), the biogas yield was 71 670, 311 180, 361 840 and 362 610 mL, respectively. The results indicated that the optimal operation loading rate of CSTR was 7.5 g VS/(L·d), and the reaction system will collapse when the loading rate was too high.

Key words： food waste; excess sludge; anaerobic digestion; biogas; organic loading rate

Cite this article

ZHAO Mingxing , HUANG Yue , MIAO Hengfeng , HUANG Zhenxing , DAI Xiaohu , RUAN Wenquan . Continuous anaerobic co-digestion of food waste and excess sludge[J]. Food and Fermentation Industries, 2020 , 46(19) : 92 -98 . DOI: 10.13995/j.cnki.11-1802/ts.024411

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