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Determination of operation factors in treating piggery wastewater by membrane bioreactor

An investigation into the treatment efficiency of real piggery wastewater of a benchscale aerobic membrane bioreactor was performed. The experiments were aimed to evaluate the effects of hydraulic retention time and activated sludge concentration. The piggery wastewater having high chemical oxygen demand, ammonium and total phosphorus concentrations (about 4200 mg/l, 320 mg/L and 48 mg/L, respectively) was employed. It was found that the removal efficiency of COD reached up to 94% even at operation conditions of HRT = 24 hours and MLSS = 6000 mg/L, but the HRT need to be increased twice in order to obtain the removal of 99% NH4 + - N and 85% T-P. The similar efficiency was also achieved by reduced HRT to 8 hours but increased MLSS to 12000 mg/L. | Determination of operation factors in treating piggery wastewater by membrane bioreactor VNU Journal of Science: Earth and Environmental Sciences, Vol. 31, No. 2 (2015) 47-53 Determination of Operation Factors in Treating Piggery Wastewater by Membrane Bioreactor Nguyễn Sáng1,*, Chu Xuân Quang1, Trần Văn Quy2, Trần Hùng Thuận1 1 Center for Advanced Material Technology – National Center for Technological Progress, C6 Thanh Xuân Bắc, Hanoi, Vietnam 2 VNU University of Science, 334 Nguyễn Trãi, Hanoi, Vietnam Received 17 April 2015 Revised 4 May 2015; Accepted 22 July 2015 Abstract: An investigation into the treatment efficiency of real piggery wastewater of a bench- scale aerobic membrane bioreactor was performed. The experiments were aimed to evaluate the effects of hydraulic retention time and activated sludge concentration. The piggery wastewater having high chemical oxygen demand, ammonium and total phosphorus concentrations (about 4200 mg/l, 320 mg/L and 48 mg/L, respectively) was employed. It was found that the removal efficiency of COD reached up to 94% even at operation conditions of HRT = 24 hours and MLSS = 6000 mg/L, but the HRT need to be increased twice in order to obtain the removal of 99% NH4+- N and 85% T-P. The similar efficiency was also achieved by reduced HRT to 8 hours but increased MLSS to 12000 mg/L. Keywords: Membrane bioreactor (MBR), piggery wastewater, microfiltration, activated sludge, eutrophication. 1. Introduction∗ contribute to eutrophication [1]. However, it is difficult to treat nitrogen by the conventional Due to containing high amount of organic activated sludge process. The organic matter matter, nitrogen, phosphorus and suspended oxidation microorganism has a high yield value solids, piggery wastewater created an important than the nitrification microorganism. Therefore, environmental impact. The free ammonia is if sludge retention time (SRT) gets shorter, .