Journal
BIORESOURCE TECHNOLOGY
Volume 185, Issue -, Pages 225-233Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.03.002
Keywords
Anaerobic membrane bioreactor; Biomass retention; Psychrophilic temperature; Municipal wastewater; Specific methane yield
Funding
- CADAGUA [IPT-2011-1078-310000]
- Spanish Ministry of the Environment
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The performance of a pilot scale anaerobic membrane bioreactor (AnMBR), comprising an upflow anaerobic sludge blanket (UASB) reactor coupled to an external ultrafiltration membrane treating municipal wastewater at 18 +/- 2 degrees C, was evaluated over three years of stable operation. The reactor was inoculated with a mesophilic inoculum without acclimation. The AnMBR supported a tCOD removal efficiency of 87 +/- 1% at hydraulic retention time (HRT) of 7 h, operating at a volumetric loading rate (VLR) of between 2 and 2.5 kg tCOD/m(3) d, reaching effluent tCOD concentrations of 100-120 mg/L and BOD5 concentrations of 35-50 mg O-2/L. Specific methane yield varied from 0.18 to 0.23 Nm(3) CH4/kg CODremoved depending on the recirculation between the membrane module and the UASB reactor. The permeate flow rate, using cycles of 15 s backwash, 7.5 min filtration, and continuous biogas sparging (40-60 m/h), ranged from 10 to 14 Lm(2)/h with trans-membrane pressure (TMP) values of 400-550 mbar. (C) 2015 Elsevier Ltd. All rights reserved.
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