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A fouling suppression system in submerged membrane bioreactors using dielectrophoretic forces |
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| Authors: | Alaa H Hawari Fei Du Michael Baune and Jorg Th&#;ming |
| Institution: | Department of Civil and Architectural Engineering, College of Engineering, Qatar University, 2713 Doha, Qatar,Center of Environmental Research and Sustainable Technology, University of Bremen, Leobener Str., D 28359 Bremen, Germany,Center of Environmental Research and Sustainable Technology, University of Bremen, Leobener Str., D 28359 Bremen, Germany and Center of Environmental Research and Sustainable Technology, University of Bremen, Leobener Str., D 28359 Bremen, Germany |
| Abstract: | A novel method was developed to suppress membrane fouling in submerged membrane bioreactors. The method is based on the dielectrophoretic (DEP) motion of particles in an inhomogeneous electrical field. Using a real sample of biomass as feed, the fouling-suppression performance using DEP with different electrical field intensities (60-160 V) and different frequencies (50-1000 Hz) was investigated. The fouling-suppression performance was found to relate closely with the intensity and frequency of the electrical field. A stronger electrical field was found to better recover the filtrate flux. This is because of a stronger DEP force acting on the biomass particles close to themembrane's surface. Above an intensity and frequency value of 130 V and 1 kHz, respectively the permeate flux was reduced due to an electrothermal effect. |
| Keywords: | Submerged membrane bioreactor Dielectrophoresis Inhomogeneous electric field Fouling |
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