Synergistic effect and biodegradation kinetics of sewage sludge and food waste mesophilic anaerobic co-digestion and the underlying stimulation mechanisms

Yang Pan, Zhongxiang Zhi, Guangyin Zhen, Xueqin Lu, Péter Bakonyi, Yu You Li, Youcai Zhao, J. Rajesh Banu

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Anaerobic co-digestion has attracted much attention due to its unique advantages compared with the anaerobic mono-digestion. In this work, the synergistic effect and biodegradation kinetics of sewage sludge (SS)and food waste (FW)were studied during anaerobic co-digestion. Biochemical methane potential (BMP)assay and three kinetic models were used to detect and analyze methane production potential during co-digestion under different ratios of SS and FW. The SS:FW ratios of 0.5:0.5 showed very high methane recovery, with the methane productivity increasing by 4.59 times (50.30 ± 10.37 mL/g-VS/day), the lag-phase shortening by 11.53 times (0.182 day)and the hydrolysis rate increasing by 3.88 times (0.334/day)compared with the SS mono-digestion. Moreover, correlation model parameter analysis indicated the Cone model has the best fitness to the experimental data. These results confirmed the superiority of co-digestion and the existence of synergy, which can greatly accelerate the biodegradation process and more effectively recover bioenergy.

Original languageEnglish
Pages (from-to)40-49
Number of pages10
JournalFuel
Volume253
DOIs
Publication statusPublished - 2019 Oct 1

Keywords

  • Co-digestion
  • Food waste
  • Kinetics modeling
  • Sewage sludge
  • Synergistic impact

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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