Assessing the stability of co-digesting sewage sludge with pig manure under different mixing ratios

Suyun Xu*, Chongyang Wang, Yangyang Sun, Liwen Luo, Jonathan W C WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study assessed the digester stability and overall methane production of co-digestion of sewage sludge (SS) and pig manure (PM). Four different ratios of PM were mixed with SS to reach different final concentrations of total solids (TS), i.e. 4%, 6%, 8% and 10%. Volatile solids (VS) reduction rate decreased along with an increase in TS%, and the maximum cumulative methane yield of 342 mL/g VSrem was obtained in treatment with TS of 6%. When TS was ≥ 8%, accumulation of volatile fatty acids (VFAs), free ammonium nitrogen (FAN) and total ammonium nitrogen (TAN) were observed. At a TS content of 10%, VFAs accumulated to > 20000 mg/L and the highest FAN was 481 mg/L. The suppression of methanogenesis was negatively correlated with FAN and VFA/TIC (P < 0.05). Co-digestion demonstrated to be an effective way to improve the methane yield from SS due to the enriched biodegradable organic substance and more balanced C/N ratio by incorporating PM.

Original languageEnglish
Pages (from-to)299-306
Number of pages8
JournalWaste Management
Volume114
DOIs
Publication statusPublished - 1 Aug 2020

Scopus Subject Areas

  • Waste Management and Disposal

User-Defined Keywords

  • Co-digestion
  • Free ammonium nitrogen
  • Methane production
  • Pig manure
  • Propionic acid
  • Sewage sludge

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