DOMESTIC DIRECT MEMBRANE FILTRATION AND IMPLICATIONS FOR COUPLING WITH ANAEROBIC MEMBRANE BIOREACTOR (DF-ANMBR) FOR WASTEWATER

Bollaboina Laxmi
Assistant Professor of Civil Engineering, Jayamukhi Institute of Technological Sciences, Chennaraopet Mandal, Narsampet, Nekkonda Rd, Makdumpuram, Telangana 506332. , IN

Pingili Vydehi
Assistant Professor of Civil Engineering, Jayamukhi Institute of Technological Sciences, Chennaraopet Mandal, Narsampet, Nekkonda Rd, Makdumpuram, Telangana 506332. , IN

Munigala srikavya
Assistant Professor of Civil Engineering, Jayamukhi Institute of Technological Sciences, Chennaraopet Mandal, Narsampet, Nekkonda Rd, Makdumpuram, Telangana 506332. , IN

Abstract

With the growing use of membranes in the water industry, different methods for using membranes to treat water is still occurring. Enhancing membrane performance is generally performed with extensive pretreatment methods before the feed water is filtered by the membrane. With the utilization of direct membrane filtration (DF), no pretreatment is performed and the membrane is exposed to raw wastewater. While this may suggest that membrane performance and permeate quality would suffer in the process, DF testing with a 0.03μm ultra filtration PVDF membrane showed that relatively high membrane flux was sustained while producing a high quality effluent. Due to the rejection of the membrane, a highly concentrated fraction of the wastewater, which is significantly reduced in volume but high in solids and organic strength, is obtained and can be treated in other ways.

A process is proposed to treat municipal wastewater by coupling a DF system with an anaerobic membrane bioreactor (AnMBR). AnMBRs generally treat industrial strength wastewater, which is high in chemical oxygen demand (COD), and may struggle with domestic wastewater, which is generally considered low strength in terms of COD.

The MFI method was adapted and used to test the fouling propensity of various treatment streams in the DFAnMBR system, including raw domestic Wastewater, concentrated domestic wastewater (20X by DF), and liquor from an active AnMBR.The effect of powdered activated carbon (PAC) on fouling propensity was also investigated. Raw wastewater had a fouling potential of about 25% of the AnMBR MFI, and with the utilization of PAC the fouling potential was further decreased to nearly 50% of the original fouling potential. The DF concentrated stream had a higher MFI value than liquor from the AnMBR, but presumably some of organics contributing to fouling would be degraded in the AnMBR. This study demonstrated that DF of raw wastewater is feasible, and the combined use of DF and AnMBR is highly promising.

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