Affiliation of Author(s):Central South University
Journal:Chemosphere
Key Words:Membrane bioreactor Biofouling Spectroscopic analysis Saline wastewater treatment Sudden salinity shock
Abstract:A MBBR-MBR system has been developed with marine microorganisms enriched for saline wastewater treatment in this work, showing high COD and NH 3 eN removals. The behaviour of fouling-related components (EPS and SMP) has been studied as functions of operating time (40e90 days), salinity (0 e30 g/L NaCl) and backflow ratio (0e300%, from MBR to MBBR). High biodegradability of the MBBR-MBR at optimal conditions can induce more biodegradation of humic acid-like ( l ex / l em : 350nm/430 nm) and fulvic acid-like (260nm/445 nm) molecules to soluble microbial by-product-like molecules (275nm/ 325 nm), reducing the membrane biofouling rate. The biodegradation process is suggested by the excitation-emission matrix (EEM) images. In the study of sudden salinity shock, results show that real- time monitoring the concentration of biofoulants is more effective (operative time extended by 60%) than monitoring the transmembrane pressure (operative time extended by 33%) to prevent membrane fouling. Due to an early warning from the real-time monitoring, the coming membrane-fouling is pre- dictable and the operating conditions, such as backflow ratio, can be changed to minimize the biofouling rate.
Volume:235
Issue:2019
Page Number:1154-1161
Translation or Not:no
Links to published journals:https://doi.org/10.1016/j.chemosphere.2019.07.005