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DOI : 10.17640/KSWST.2020.28.4.51 ,    Vol.28, No.4, 51 ~ 61, 2020
Analysis of Factors for Improvement of Nitrogen and Phosphorus Reduction in Membrane Bioreactors
정훈섭 Hoon-sup Jung , 현길수 Kil-soo Hyun
This study aims to investigate the effects of carbon/nitrogen/phosphorus (C/N/P) ratio and recirculation on nutrient removal in a membrane bioreactor (MBR) and anaerobic/aerobic(AN/O) processes coupled with MBR by using real facilities. Treatment capacities of a MBR and an AN/O-MBR are 5,000 m3/d and 15,000 m3/d, respectively. Influent characteristics of real wastewater used for this study are BOD <200 mg/L, COD <220 mg/L, T-N <65 mg/L, T-P <8 mg/L, and E-coli.< 100,000 No/mL. In reducing organics and nutrients, AN/O-MBR performance achieved higher efficiencies (5-40% higher) than those of MBR. In particular, the removal efficiencies of N and P by AN/O-MBR were about 0.2-0.4 times higher than those by MBR while both MBR and AN/O-MBR achieved high efficiencies ( >95%) in reducing chemical oxygen demand (COD). For AN/O-MBR in reducing total nitrogen (T-N), internal recirculation (IR) of 1.5-2.0Q achieved higher efficiencies (10-30% higher) than those of IR. In particular, the addition of methanol as carbon source into MBR process achieved higher efficiencies (20-25% higher) than that without methanol. For total phosphorus (T-P) removal, the addition of polyaluminum chloride (PAC) as coagulant into the MBR process achieved higher efficiencies (30-80%) than that without PAC. For transmembrane pressure (TMP) build-up, the results reveal that the additions of methanol and PAC have effects in mitigating TMP build-up compared to MBR process without them.
Key Words
AN, O-MBR, C, N, P ratio, External carbon source, Membrane bioreactor, Nutrient removal, PAC, Recirculation, 혐기-호기 MBR, C, N, P 비, 외부탄소원, 분리막생물반응조, 질소인제거, 응집제, 내부순환
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