Sustainable membrane operation design for the treatment of the synthetic coke wastewater in SMBR

摘要

Membrane fouling in the membrane bioreactor (MBR) is typically caused by the interactionnof microbial characteristics, hydrodynamic behavior, operation environment, wastewaterncharacteristics and membrane properties, which result in the deterioration of performancenand increasing energy consumption and cost of membrane replacement. The effect of thencrucial MBR parameters (the microbial loading and characteristics, dissolved oxygen (DO),nhydraulic retention time (HRT), backwashing conditions and membrane characteristics) onnmembrane fouling was investigated in a submerged membrane bioreactor (SMBR) during the longnterm treatment of synthetic coke wastewater. Also the optimum operation strategies werenfurther utilized in order to satisfy the minimal membrane fouling operation through a long-termnevaluation of the MBR performance. It has been demonstrated that with application of thesenoptimal designed conditions, significant membrane fouling improvements were achieved over anlong operating time, so it was possible to perform in sustainable operation for MBR. In this study,nthe upper limit of the sustainable flux is found to be as much as 18.6 L/m2 h and the optimumnsustainable flux value should be 50 , 75% of critical flux to satisfy the desired sustainablenoperation period.