Biomethanation and microbial community changes in a digester treating sludge from a brackish aquaculture recirculation system

Xuedong Zhang, Yu Tao, Jianmei Hu, Gang Liu, Henri Spanjers, Jules van Lier

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

Using a high-salinity-adapted inoculum and a moderate stepwise-increased organic loading rate (OLR), a stable digester performance was achieved in treating sludge from a brackish aquaculture recirculation system. The specific methane yield was distinctly enhanced, reaching 0.203 L CH4/g CODadded, compared to literature values (0.140–0.154 L CH4/g CODadded) from the salty sludges. OLR adjustment and the fecal substrate substantially influenced population changes in the digester. Within the bacterial subpopulations, the relative abundance of Bacillus and Bacteroides declined, accompanied by the increase of Clostridium and Trigonala over time. The results show Trigonala was derived from the substrate and accumulated inside the digester. The most abundant methanogen was Methanosarcina in the inoculum and the digestates. The Methanosarcina proliferation can be ascribed to its metabolic versatility, probably a feature of crucial importance for high-salinity environments. Other frequently observed methanogens were outcompeted. The population similarity at the genus level between inoculum and digestates declined during the initial stage and afterwards increased.
Original languageEnglish
Pages (from-to)338-347
JournalBioresource Technology
Volume214
DOIs
Publication statusPublished - 2016

Keywords

  • Anaerobic digestion
  • Brackish aquaculture recirculation systems
  • Stepwise increased OLR
  • Sludge retention time (SRT)
  • Inoculum
  • Bacterial and archaeal population

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