Treatment Of Dairy Industry Wastewater Research Articles

Membrane sequencing batch reactor system for the treatment of dairy industry wastewater

Abstract A membrane separation process was coupled to a sequencing batch reactor (SBR) for biological nutrient removal (BNR) processes and a combined system was named a membrane sequencing batch reactor (MSBR). MSBR was used for the treatment of dairy industry wastewater and optimized to increase the treatment efficiency. Since a diffuser-attached module design, subcritical flux operation, and intermittent suction method were adapted to the system, long-term operation was possible, i.e. the system could be operated for more than 110 days with only one membrane washing. BOD removal was high (97–98%) and stable. SS (suspended solid)-free effluent was obtained by membrane separation. Since nitrogen was mainly consumed as nutrient for synthesis of new cells due to the low influent concentration, the removal rate reached 96%. Phosphorus removal was relatively low because of the limit of the biological process, i.e. removal efficiency ultimately depends on the amount of excess sludge wasting. A removal rate of 80% was reached after system optimization.

Improved performance of a hybrid design over an anaerobic filter for the treatment of dairy industry wastewater at laboratory scale

A combined system designed by converting the flow mixing chamber of an anaerobic filter into an UASB resulted in an increased efficiency of removal of organic matter of 92% and in a gas production of 4.64 l·l −1·d −1, at the highest organic loading rate tested compared with that of the unmodified anaerobic filter. Both reactors were tested using dairy industry wastewater at identical operating conditions at 30°C and organic loading rate between 1 to 8 g COD· l −1·d −1.

Treatment of dairy industry wastewater with an anaerobic filter

Concentrations of up to 10.2 g COD/L were applied to an horizontal anaerobic filter at 40°C, obtaining efficiencies in COD removal of 85%. The contents of the reactor are kept mixed by recycling and at a pH value of 6.9.