Abstract
The high cost of membrane modules and the inevitable membrane fouling are the two key factors restricting the industrial application of MBR technology. By introducing dynamic membranes to replace traditional membrane modules, the novel dynamic membrane bioreactor (DMBR) can effectively save operating cost. However, how to avoid membrane fouling under long-term operation remains to be studied. The main purpose of this research is to study the effect of intermittent electric field on membrane fouling and pollutant removal in a DMBR. The results showed that the membrane fouling rate was significantly reduced by 33% under intermittent electric field condition. The average removal efficiency of COD, NH<sub>4</sub><sup>+</sup>-N in the reactor with intermittent electric field was increased by 4.0%, 8.7%, respectively. In addition, the content of cyclic di-GMP (c-di-GMP, a typical second messenger molecule) was reduced under electric field condition, thus reducing the amount of the extracellular polymeric substances. This study would provide the design and operational information of DMBR under the intermittent electric field.
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