Performances of a submerged anaerobic membrane bioreactor (AnMBR) for latex serum treatment

摘要

This paper focused on anaerobic membrane bioreactor (AnMBR) performances when treating latex serum at two organic-loading rates (OLR), 8.1 and 12.7kgCODm(-3)d(-1) and imposed solids retention time (SRT) and hydraulic retention time (HRT), 30 and 2d, respectively. Results pointed out the determining role of the membrane barrier in AnMBR to improve chemical oxygen demand (COD) removal efficiency reaching 86 and 73.5% for OLR of 8.1 and 12.7kgCODm(-3)d(-1), respectively. The degradation of COD in the anaerobic metabolism induced some biogas production, notably methane with a methane yield coefficient close to 0.22 and 0.24NLgCOD(removed)(-1). In the experiment carried out in AnMBR, membrane fouling was mainly due to the structuring of cake deposit on the membrane surface, and this deposit appeared reversible by water rinsing. The analyses of rinsing solutions corresponding to cake detachment pointed out carbohydrates as the major component of fouling material whatever the OLR studied. Scanning electron microscopy analyses revealed a higher thickness of deposit when working at higher OLR, and atomic force microscopy (AFM) analyses showed a lower roughness relating to a more compact structure in the same conditions of higher OLR.