Operation of a submerged aerobic membrane bioreactor for decentralised municipal wastewater treatment in North Africa

George Skouteris, Tom C Arnot, Firas Feki, Mouna Jraou, Sami Sayadi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A pilot-scale aerobic membrane bioreactor (MBR) was operated for 6.5 months, alongside a full-sized conventional activated sludge (AS) plant, treating high-strength domestic wastewater originating from Sfax in Tunisia. The main target was to investigate whether or not the MBR could produce effluent suitable for unrestricted crop irrigation in Tunisia, a target that the AS plant fails to achieve. Membrane performance analysis and energy benchmarking were also carried out. The MBR did produce irrigation quality water regardless of the mixed-liquor suspended solids (MLSS) or feed concentrations. The average chemical oxygen demand (COD) removal efficiency was 88% at an average MLSS concentration of 4.59 g L−1, and 89.7% at an average MLSS concentration of 9.52 g L−1. During membrane performance evaluation, a maximum sustainable membrane permeate flux of 12.81 L m−2 h−1, at an average mixed-liquor temperature of 24 °C and an average MLSS concentration of 9.21 g L−1 was maintained. Finally, energy benchmarking was carried out; the average energy consumption rate was 8.95 kWh d−1, corresponding to an average specific energy demand (SED) of 3.82 kWh m−3. This is a relatively high value compared to the AS plant, whose SED value is always lower than 3 kWh m−3, but further energy reduction is possible for the MBR as well as the AS plant effluent requires further treatment in order to be acceptable for unrestricted human crop irrigation; hence, additional energy input. The work demonstrates the potential impact of MBRs in decentralised domestic wastewater treatment in North Africa.
Original languageEnglish
JournalWater Practice & Technology
Volume7
Issue number3
DOIs
Publication statusPublished - Sep 2012

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bioreactor
membrane
activated sludge
benchmarking
irrigation
energy
effluent
crop
North Africa
wastewater treatment
chemical oxygen demand
water quality
wastewater
temperature

Keywords

  • decentralised municipal wastewater treatment
  • membrane bioreactors
  • unrestricted irrigation
  • North Africa
  • sustainable membrane permeate flux

Cite this

Operation of a submerged aerobic membrane bioreactor for decentralised municipal wastewater treatment in North Africa. / Skouteris, George; Arnot, Tom C; Feki, Firas; Jraou, Mouna; Sayadi, Sami.

In: Water Practice & Technology, Vol. 7, No. 3, 09.2012.

Research output: Contribution to journalArticle

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