engleski

Treatment of food industry wastewaters in membrane bioreactor

Application of membrane bioreactor (MBR) was investigated as a treatment process for two different types of food industry wastewaters: an oil plant wastewater and wastewater from beverage production. In beverage production membrane bioreactor achieved effective and stable organic compounds removal from the wastewater (COD=94 %, TOC=94 %, BOD5= 98 %) during all period of experiment. Facility had conventional activated sludge wastewater treatment which could not treat wastewater satisfactorily due to the frequent changes in the wastewater composition and flow rate. Therefore, membrane bioreactor with immersed membrane was tested for wastewater treatment to compare the two technologies. Average percent of COD removal with membrane bioreactor for treatment of wastewater from vegetable oil production was 75%, while fats and oils were removed with an average of 86%. Best treatment efficiency was achieved by treatment of mixed wastewaters from all of the sources where COD was removed with 91% and oil and grease with 95% efficiency. Activated sludge was successfully kept in the bioreactor by immersed membrane so that stable concentration of activated sludge biomass could be maintained in spite of large fluctuations in the composition of the wastewater. Stable and uninterrupted filtration was obtained by using backwash cleaning and by maintaining constant flow and aeration rate. This type of wastewater treatment ensures large return of processed water for reuse, which enables more efficient water management and considerable reduction in wastewater discharge cost.

activated sludge; food industry wastewater; beverage production; oil plant; membrane bioreactor

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