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Anaerobic co-digestion of low Chemical oxygen demand concentration sludge mixture by different pretreatment methods

  • Authors (legacy)
    Corresponding: Wenhai Lin
    Co-authors: Li Q.
    Yin Y.
    Chen Q.
    Xiang DD.
    Shi L.
    Lin WH.
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  • gnest_05241_published.pdf
  • Paper ID
    gnest_05241
  • Paper status
    Published
  • Date paper submitted
  • Date paper accepted
  • Date paper online
DOI
https://doi.org/10.30955/gnj.005241
Graphical abstract
Abstract

Three laboratory scale systems were operated to study the anaerobic co-digestion of sewage sludge with the excess activated sludge and cattle manure which contained low COD concentration. The experiments were performed to evaluate the effects of different methods of pretreatment. Since the poor organic substrate, the organic loading rate(OLR) was designed about 1.6kg total solids(TS)(l *d)-1 and the hydraulic retention time was controlled from 78days to 53days throughout the experiment to investigate the effects of the input on overall stability. When the digesters got stabilized, the COD removal efficiencies were 61%, 89% and 54%, respectively, and the pH value fluctuated little in the three digesters. The results indicated that the treatment of 1g volatile solids(VS) of SSEASCM on semi-continuous co-digestion generated more than 200ml of biogas on average. Thus, anaerobic co-digestion of the mixed sludge provided a means for low COD waste treatment and produced renewable energy.

Keywords
Anaerobic digestion Manure sewage sludge Excess activated sludge Biogas Low COD concentration.
Cite this article
Li, Q. et al. (2024) “Anaerobic co-digestion of low Chemical oxygen demand concentration sludge mixture by different pretreatment methods”, Global NEST Journal, 26(2). Available at: https://doi.org/10.30955/gnj.005241.
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  • gnest_05241_published.pdf