Abstract
Compared with the conventional MBR, granular sludge MBR due to the reactor compact design, outstanding settleability, and the ability of granules to withstand high organic loading rate has emerged with strong potential to overcome membrane fouling. The objective of this study is to configure an high-rate system using granular sludge sequencing batch reactor (GSSBR) and granular media filter (GMF) using sand and granular activated carbon (GAC)) coupled with membrane for enhancing membrane filtration performance and reducing membrane fouling in treating wastewater. As a result, GSSBR/GMF/MF configured system achieved higher efficiency than GSSBR-MBR and GSSBR/MF systems in reducing total organic carbon (TOC), total nitrogen (T-N) and total phosphorus (T-P), respectively. For transmembrane pressure (TMP), the GSSBR/GMP/MF developed much lower than that of GSSBR-MBR. In particular, the GSSBR/sand filter/MF system achieved lower TMP build-up than that of the GSSBR/GAC filter/MF system The above results indicate the GSSBR-MF coupled with GMF is more effective than conventional MBR using activated sludge in mitigating membrane fouling. The food/microorganism (F/M) ratio in the GSSBR and the biofilm growth in the GMF play an important role to reduce contaminants and TMP build-up.
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