Enhanced degradation and biogas production of waste activated sludge by a high-solid anaerobic membrane bioreactor together with in pipe thermal pretreatment process

Guangze Guo, Yemei Li, Shitong Zhou, Yujie Chen, Yu Qin, Yu You Li

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

An integrated system combining in pipe thermal pretreatment with a high-solid anaerobic membrane bioreactor (AnMBR) was developed to promote the anaerobic digestion of waste activated sludge (WAS). Two different pretreatment methods investigated were the venturi nozzle treatment (VNT) and steam injector treatment (SIT), both at a low temperature of 70 °C. The biogas production after pretreatment was 23.5–30.5% higher than that of untreated WAS, and the VS based biogas yield was 0.46–0.47 L/g-VS when HRT was 15 days. The membrane operated smoothly when the average flux was 9.6 and 4.5 L/m2/h under an MLTS of 25 and 30 g/L, respectively. The calculations of the mass balance indicated that 44–45% COD was converted to methane with pretreatment and only 1% remained in the permeate. That is, high energy recovery and organic matter removal efficiency were achieved for the treatment of WAS using the high-solid AnMBR with in pipe thermal pretreatment.

Original languageEnglish
Article number126583
JournalBioresource Technology
Volume346
DOIs
Publication statusPublished - 2022 Feb

Keywords

  • High-solid AnMBR
  • In pipe thermal pretreatment
  • Mass balance
  • Membrane filtration
  • Waste activated sludge

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