Treatment of high strength wastewater in sequencing batch bioreactors (SBBRS) using suspended and attached growth configuration
2016
Saba, B. (PMAS Arid Agriculture Univ., Rawalpindi (Pakistan). Dept. of Environmental Sciences) | Mahmood, T. (PMAS Arid Agriculture Univ., Rawalpindi (Pakistan). Dept. of Environmental Sciences) | Zaman, B. (PMAS Arid Agriculture Univ., Rawalpindi (Pakistan). Dept. of Environmental Sciences) | Khalid, A. (PMAS Arid Agriculture Univ., Rawalpindi (Pakistan). Dept. of Environmental Sciences) | Khan, S.J. (National Univ. of Sciences and Technology, Islamabad (Pakistan). Inst. of Environmental Science and Engineering)
Wastewater reclamation using cost effective technologies is a promising solution to meet stringent discharge standards. Present study illustrated wastewater treatment performance comparison of laboratory scale attach growth sequencing batch bioreactors (AGSBBRs) with two different bio-carriers taking suspended growth sequencing batch bioreactor (SGSBBR) as control. The removal of chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) of polyurethane sponge and polystyrene suspended bio-carriers occupying 10% reactor volumes in AGSBBRs were determined. It was found that SGSBBR achieved the 97% plus minus 2 removal efficiency in 4 h hydraulic retention time (HRT). In case of AGSBBRs, the results showed 97% plus minus 2 and 98% plus minus 1 COD removal efficiencies with polyurethane while 97% plus minus 2 and 97.5% plus minus 1.2 for polystyrene at 4 h and 6 h HRT, respectively. The TN and TP removal efficiency was 69.7 plus minus 4% and 52 plus minus 4.8% in SGSBBR, 71 plus minus 0.17% and 51 plus minus 2.7% in polystyrene AGSBBR while 71.55 plus minus 0.67% and 58 plus minus 3.2% in polyurethane AGSBBR. It was concluded that enhanced performance with AGSBBR might be due to enforced anoxic/aerobic conditions in the inner layers of biofilm formed on bio-carriers which facilitated the required metabolic conditions for treating high strength wastewater.
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