Enzyme supplemented membrane bioreactor (EnMBR) for degradation of recalcitrant compounds in industrial wastewater

Enzyme supplemented membrane bioreactor (EnMBR) for degradation of recalcitrant compounds in industrial wastewater

Industrial wastewaters typically contain complex, recalcitrant compounds that are not biochemically degraded in conventional treatment systems and have to be broken down by chemical/enzymatic means. The enzymatic approach is versatile and environment-friendly[1] but its effectiveness is determined by factors like enzyme stability and appropriate reactor design. Membrane bioreactors(MBRs), combining biological treatment and membrane filtration, is a promising treatment technology; the high treated water quality enables on-site reuse. This proposal aims to incorporate nzymatic degradation in conventional MBR operation addressing aspects of enzyme efficacy and membrane fouling. To enable recovery and reuse, the enzyme would be immobilized on suitable porous carriers; such carriers are being used in attached growth wastewater treatment systems[2] and for controlling fouling in MBRs[3]. Other options include immobilization on superparamagnetic ironoxide nanoparticles[4]. Enzyme immobilization on polymeric (polysulphone, polyvinylidene fluoride) membranes with well-defined pore sizes and porosity and ceramic membranes (prepared from waste flyash[5]) would also be studied. The membranes and carriers will be screened in a high throughput MBR[6] using known wastewaters under aerobic/anaerobic conditions. On this basis, select combinations will be investigated in novel reactors viz. vibrating membranes in MBR for fouling reduction.

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