Energy recovery potential of thermophilic high-solids co-digestion of coffee processing wastewater and waste activated sludge by anaerobic membrane bioreactor

Rong Chen, Wen Wen, Hongyu Jiang, Zhen Lei, Mingzhe Li, Yu You Li

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

A large amount of wastewater is generated in the processing of coffee from fruit to cup. Thermophilic high-solids co-digestion of coffee processing wastewater (CPW) and waste activated sludge (WAS) has been succeeded by anaerobic membrane bioreactor (AnMBR). Chemical oxygen demand (COD) removal efficiencies of 92 ± 3% with an average methane yield of 0.28 LCH4/gCODremoved were achieved at a high solids content of 50 g/L in the AnMBR. The optimal digestion performance of 82.4% removal COD conversion to CH4 was achieved at hydraulic retention time (HRT) 10 d. Energy balance analysis revealed AnMBR has succeeded in energy positive at all the HRTs. The net energy potential (NEP) was determined to average 2.12–2.82 kJ/gCOD, amongst which the maximum NEP was achieved at HRT 15 d. These results indicated the high-solids co-digestion by AnMBR is a promising approach to maximize the bioenergy conversion from the co-substrate of CPW and WAS.

Original languageEnglish
Pages (from-to)127-133
Number of pages7
JournalBioresource Technology
Volume274
DOIs
Publication statusPublished - 2019 Feb

Keywords

  • Anaerobic membrane bioreactor
  • Bioenergy recovery
  • Co-substrate fermentation
  • Coffee processing wastewater
  • Waste activated sludge

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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