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TREATMENT OF HIGH STRENGTH PET FOOD WASTEWATER USING TWO STAGE MEMBRANE BIOREACTORS

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This study explored two stages MBR to treat DAF-pretreated high strength pet food wastewater characterized by oil & grease concentrations of up to 50,000 to 82,000 mg/L and total COD and BOD5 concentration of 100,000 and 80,000 mg/L respectively to meet stringent surface discharge criteria i.e. BOD5, TSS and NH4-N of < 10 mg / L. As anticipated, organic contaminants were removed primarily in the 1st stage, followed by almost complete removal of ammonia in the 2nd stage. More then 96% of COD was removed in the 1st stage even at hydraulic retention time of 2.8 days which was attributed to ability of the membrane to retain biomass with total suspended solids (TSS) concentration of up to 35 g/L. Overall removal of TSS, total COD, total BOD5 and ammonia was 100%, 95.2%, 99.9% and 99.7% respectively, which rendered concentration of these parameters <10 mg/L in the final effluent. Rise in poorly biodegradable COD across the 2nd stage reduced overall COD removal efficiency of the system. Occurrence of consistent nitrite accumulation observed over a period of more than 100 days (or >17 overall HRTs) even at dissolved oxygen (DO) concentration of more than 2.5 mg/L was remarkable. Residual alkalinity requirement for nitrification was quantified. Membrane performance in contaminant removal and its operational aspects were extensively studied in this work.
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Document Type: Research Article

Publication date: 01 January 2004

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