Impact of Hydraulic Retention Time(HRT) on Extracellular Polymeric Substances(EPS) Production and Membrane Fouling in High-loaded Membrane Sequencing Batch Reactor
Volume Title: 1
Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
In the present study, a high loaded membrane sequencing batch reactor (HL-MSBR) operated at an SRT of 2 days, and two different HRTs(9 and 12 hr), was used for the treatment of synthetic wastewater. The COD removal efficiency of the system was acceptable at both HRTs and HRT variation, in the range studies, did not have any effect on COD removal. The TMP variation indicated that the membrane fouling was more severe at HRT of 9hr compared to that of 12hr. The overall filtration resistance analysis showed that cake layer formation was the dominant fouling mechanism during both operating conditions, contributing to 58.6% and 81% of the total resistance for HRTs of 12hr and 9hr, repectively. The concentrations of total extracellular polymeric substance (EPS), soluble microbial products (SMP), protein content of EPS (EPSp) and loosely bound EPS content (LB-EPS) increased with increasing HRT. Variation in HRT did not have a significant effect on carbohydrate content. Therefore, EPS and SMP, EPSp and LB-EPS are important parameters in membrane fouling of HL-MSBR.