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Performance of a bioreactor with submerged membranes for aerobic treatment of municipal waste water.
Citation key Rosenberger2002
Author S. Rosenberger and U. Krüger and R. Witzig and W. Manz and U. Szewzyk and M. Kraume
Pages 413–420
Year 2002
DOI 10.1016/S0043-1354(01)00223-8
Journal Water Research
Volume 36
Number 2
Month Jan
Institution Department of Chemical Engineering, Technical University of Berlin, Germany.
Abstract Aerobic treatment of municipal waste water in a membrane bioreactor was studied for 535 d. Apart from sampling, sludge was retained completely by a submerged hollow fibre membrane with a pore-size of 0.2 microm. The pilot plant comprised an anoxic zone to enable denitrification. The maximum liquid hold-up of the plant was 3.9 m3. In this study the reactor performance and the stability of the process and the membrane capacity were investigated. A stable flux of 181 m(-2)h(-1) could be realised with a mean transmembrane pressure difference of 0.3bar with air-bubbling and backflushing the membrane and cleaning it in place every two months for one or two hours. For about 140d, a flux of 271 m(-2)h(-1) was achieved, but cleaning became necessary more often. The hydraulic retention time (HRT) varied between 10.4 and 15.6h. Accordingly the volumetric loading rate was between 1.1 and 1.7kg CODm(-3)d(-1). No inoculum was used. The mixed liquor suspended solids (MLSS) concentration gradually increased to 18-20g MLSSl(-1). The feed to microorganism (F/M) ratio varied according to the operation conditions but decreased against a value of 0.07 kg COD kg(-1) MLSSd(-1). Treatment performance was very stable and on a high level. The COD was reduced by 95\%. Nitrification was complete and up to 82\% of the total nitrogen could be denitrified.
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