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RISS 인기검색어
- 검색키워드
- 저자 : 정훈섭 ( Hoon-sup Jung ) (검색결과 3 건)
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정훈섭 ( Hoon-sup Jung ),현길수 ( Kil-soo Hyun ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.3
Microplastics (MPs) with diameters less than 5 mm in wastewaters are being increasingly discharged into aquatic environment from plastic industries, personal care products, and synthetic textiles. Futher, MPs have a negative impact on the environment due to their extremely low biodegradability. This study aims at investigating the behaviour of MPs in treated waters using real biological nutrient removal (BNR) systems. In terms of shape, the majority of MPs in real wastewaters are fibers and fragments. Most BNR systems achieved high efficiency (>95%) in reducing the MPs from wastewaters. In the BNR systems, the profiles sizes of MPs removal are in the following order: aeration tank (AT) > primary settling tank > total phosphorus removal tank > return sludge > final settling tank (FST). Higher efficiency of MPs removal during aeration in the AT as compared to the other processes resulted in the absorption and fixation of MPs in the activated sludge and biofilm. In contrast, lower efficiency of FST resulted in the MPs not being absorbed, which were floating in treated water without particulate; thus, the floating MPs were discharged without settling due to their lower specific gravity. Therefore, a filtration process should be introduced to effectively reduce the MPs in the effluent before it enters the FTS.
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MBR공정의 질소.인저감 효과 개선을 위한 영향인자분석
정훈섭 ( Hoon-sup Jung ),현길수 ( Kil-soo Hyun ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.4
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.
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정훈섭 ( Hoon-sup Jung ),송인수 ( In-soo Song ),현길수 ( Kil-soo Hyun ) 한국수처리학회(구 한국수처리기술연구회) 2021 한국수처리학회지 Vol.29 No.3
Membrane bioreactor (MBR) combining an activated sludge process and membrane filtration could achieve high nutrient removal efficiency and complete biomass retention without a secondary clarifier. Membrane fouling remains the most challenging issue in MBR operation and attracts considerable attention in MBR studies. The objective of this study is to investigate the influence of permeate flux, aeration mode and strength, and mixed liquor suspended solid (MLSS) on membrane filtration of small-scale MBR (the capacity 100㎥/d), which consisted of anaerobic, anoxic, and aeration tank coupled with membrane. Experiments were conducted with real MBR using real wastewater (BOD <250 mg/L, COD <220 mg/L, T-N <65 mg/L, T-P <8 mg/L, E-coli <100,000 no/mL). As a result, the increase of both permeate flux and MLSS increased TMP of MBR while the increase of aeration strength decreased the TMP. Compared to the existing operation conditions of MBR, the operation conditions of shorter filtration time (8 min on/ 2 min off) for a cycle and lower MLSS (<3000 mg/L) in MBR resulted in longer filtration duration time (about two times) as well as the reduction of cleaning chemical.
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