Inert COD production in a membrane anaerobic reactor treating brewery wastewater

B. Kasapgil Ince*, O. Ince, P. J. Sallis, G. K. Anderson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

In this study, inert COD production in a crossflow ultrafiltration membrane anaerobic reactor (CUMAR) system treating brewery wastewater, was investigated. The system was operated at a wide range of influent chemical oxygen demand (COD) concentrations and solid retention times (SRT) in order to determine residual non-biodegradable COD produced by biomass in the anaerobic reactor. Previous studies showed that the wastewater had practically no inert soluble COD. The inert soluble COD in the effluent would, therefore, have been produced in the anaerobic reactor by the biomass. Significant increases in the effluent COD concentration were observed during the operation of the CUMAR system at SRT lower than 100 days. It was also calculated from the results that the soluble microbial products measured in terms of COD were found to be an average of 2.2% of the influent COD. These microbial products were not removed from the effluent even with extended operation times. Throughout the operation, a maximum of 28.5 kg COD/m3 day was applied, at which point COD removal efficiencies of no lower than 97% in the anaerobic reactor and 99% in the membrane permeate were achieved during the steady-state operation of the CUMAR system.

Original languageEnglish
Pages (from-to)3943-3948
Number of pages6
JournalWater Research
Volume34
Issue number16
DOIs
Publication statusPublished - 1 Nov 2000

Keywords

  • Anaerobic contact reactor
  • Brewery wastewater
  • Crossflow ultrafiltration
  • Inert COD
  • Microbial product formation

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