Long solid retention time (SRT) has minor role in promoting methane production in a 65 °C single-stage anaerobic sludge digester

Yun Chen, Keke Xiao, Xie Jiang, Nan Shen, Raymond J. Zeng, Yan Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

In this study, a thermophilic (65 °C) single-stage wasted activated sludge (WAS) digester was established and the effects of solid retention time (SRT) on the reactor performance were investigated. The result showed that the optimum SRT was 6 days with methane yield of 186.16 mL/g VS. It was found that SRT had little effect on the hydrolysis and volatile solids (VS) destruction, and the high temperature employed seemed sufficient to achieve maximum hydrolysis and VS destruction performance. Longer SRT, however, promoted the release of recalcitrant compounds and impaired acidification, leading to the low methane yield. The microbial community analysis revealed that the dominant pathway for methane production was through syntrophic activity of acetate oxidizing bacteria and hydrogenotrophic methanogens while acetoclastic methanogens were absent in the system.

Original languageEnglish
Pages (from-to)724-729
Number of pages6
JournalBioresource Technology
Volume247
DOIs
StatePublished - 2018
Externally publishedYes

Keywords

  • Methane production
  • Single-stage digestion
  • Solid retention time
  • Thermophilic temperature (65 °C)

Fingerprint

Dive into the research topics of 'Long solid retention time (SRT) has minor role in promoting methane production in a 65 °C single-stage anaerobic sludge digester'. Together they form a unique fingerprint.

Cite this