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Biodegradation of particulate organics and its enhancement during anaerobic co-digestion of municipal biowaste and waste activated sludge

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  • Gao, Xingbao
  • Liu, Xiao
  • Wang, Wei

Abstract

Biodegradation of particulate organics is considered to be as an essential factor in the anaerobic co-digestion performance and biogas recovery of biowaste. To determine the rate-limiting step of particulate organics hydrolysis during co-digestion of municipal biowaste and waste activated sludge (WAS), the particle size distribution of organic compounds before and after digestion was examined for a mesophilic co-digestion system. As organic load rate increased and hydraulic retention time decreased, the removal rate of big-size particulate organics did not change significantly, indicating that the disintegration of big particles is not the rate-limiting step, while soluble organics accumulated in the digestate. This implies that the enzymatic hydrolysis of soluble organics is the rate-limiting step in the hydrolysis process. Addition of WAS to substrate did not significantly change the removal rate of particulate organics >420 μm, while the residual content of particulate organics 0.45–74 μm in size increased because the non-biodegradable organics in WAS were in this size range. After biodegradability enhancement of WAS by hydrothermal pretreatment, the removal rate of particulate organics increased significantly. Thus, biodegradability enhancement is more effective than particle size reduction in optimizing the co-digestion process with WAS in practice.

Suggested Citation

  • Gao, Xingbao & Liu, Xiao & Wang, Wei, 2016. "Biodegradation of particulate organics and its enhancement during anaerobic co-digestion of municipal biowaste and waste activated sludge," Renewable Energy, Elsevier, vol. 96(PB), pages 1086-1092.
    • Handle: RePEc:eee:renene:v:96:y:2016:i:pb:p:1086-1092
    DOI: 10.1016/j.renene.2016.01.019
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    References listed on IDEAS

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    1. Gómez, X. & Cuetos, M.J. & Cara, J. & Morán, A. & García, A.I., 2006. "Anaerobic co-digestion of primary sludge and the fruit and vegetable fraction of the municipal solid wastes," Renewable Energy, Elsevier, vol. 31(12), pages 2017-2024.
    2. Qiao, Wei & Yan, Xiuyi & Ye, Junhui & Sun, Yifei & Wang, Wei & Zhang, Zhongzhi, 2011. "Evaluation of biogas production from different biomass wastes with/without hydrothermal pretreatment," Renewable Energy, Elsevier, vol. 36(12), pages 3313-3318.
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    1. Smith, Kate & Liu, Shuming & Liu, Ying & Guo, Shengjie, 2018. "Can China reduce energy for water? A review of energy for urban water supply and wastewater treatment and suggestions for change," Renewable and Sustainable Energy Reviews, Elsevier, vol. 91(C), pages 41-58.

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