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Air-pulsing과 Air-lifting을 이용한 하수처리수 여과방식에 관한 연구
김무식(Moo-Sik Kim),김학석(Hak-Seok Kim),이두희(Doo-Hui Lee) 한국환경관리학회 2006 環境管理學會誌 Vol.12 No.3
본 연구는 MBR 프로세스의 여과공정을 갱신하기위해 폐수처리에 적용된 air-lifting과 air-pulsing system을 평가하기 위한 연구이다. 시스템 작동 요소들은 air-injection 비율과 처리된 물의 직배출 시간이다. - air-injection 비는 역세주기를 줄이고 작동시간 증가를 위한 생물 반응조에서의 MBR공정의 여과능을 향상시켰다. 8hrt에서 분당 6회가 최적의 injecting 비였고 효과적인 SS농도는 일관적으로 1.0㎎/L이하였다. - air-pulsing system을 사용함으로써 여과막의 오염은 빠르게 줄여졌고 여과막의 교체시기는 늦춰졌다. - 그러므로 air-plusing system 사용에 의한 직배출 공정은 여과막의 fouling 형성을 방지할 수 있고 효율적인 SS농도는 작동 기간동안 안정화 된다. This study was performed to evaluate the ability of air-lifting and air-pulsing system which was applied to wastewater treatment facilities to retrofit the filtration process of MBR processes. The factors of operating the system are air-injection rate and direct rejection time of treated water respectively. The results are as follows ; It was the air-injection rate that enhanced the filtration ability of MBR processes in bioreactor to reduce the backwashing period and increase the operating time. It was shown that the optimum injecting rate was 6 times per minutes in HRT(Hydraulic Retention Time) of 8 hours and the effluent SS concentration was under 1.0㎎/L constantly. It means that the membrane contamination was reduced quickly and the period of replacement of membrane was lengthened by using the air-injection system. Therefore the direct rejection process by usage of the air-pulsing system was effective to protect the fouling in membrane and the concentration of effluent SS was stabilized during the operating period.
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생물학적 질소·인 제거를 위한 SMMIAR(Submerged Moving Media Intermittent Aeration Reactor) 공정의 운전 특성
김홍태,김학석,김규창 한국환경과학회 2003 한국환경과학회지 Vol.12 No.1
This study was carried out to obtain the operating characteristics of SMMIAR process for biological nitrogen phosphours removal. SMMIAR was operated at HLR(Hydraulic loading rate) of 39.6, 52.8, 63.4 and 79.2 ℓ/㎥/d respectively and the operating parameters such as intermittent aeration tine ratio of aerobic/anoxic, DO and microorganism concentration were change to confirm the optimum operating condition. The concentration wastewater BOD, TN(Total nitrogen) and TP(Total phosphours) were 150, 30 and 7.5㎎/ℓ respectively. Achieving better removal effciencies of BOD, TN and TP up to 90,85.4 and 95.4% respectively, we must keep in operation condition of SMMIAR by 0.75 of time ratio of aerobic/anoxie and by minimum 45 minutes of oxic period simltaneously.
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Air-Pulsing에 의한 SS여과와 인제거 특성에 관한 연구
김무식,김학석,이두희 대구보건대학 2005 대구보건대학 論文集 Vol.25 No.-
This study was performed to evaluate the ability of air-lifting and air-pulsing system which was applied a wastewater treatment facilities to retrofit the system. The factors of operating the system are hydraulic retention time, MLSS concentration and direct rejection time respectively. The experiments and results are as follows ; 1) It was the rejection time which enhanced the phosphorus removal efficiency in this system to reduce the secondary P-release to deteriorate the treated water. It was shown that the T-P removal was over 90% in HRT of 8 hours but the variation of air-lifting time from 30 minutes to 60 minutes were not fluctuated the removal efficiency of T-P. It means that the efficiency is no subject to air-lifting time. 2) The direct rejection process using the air-pulsing system was effective to protect the fouling in membrane and the concentration of effluent SS was stabilized during the operating period.
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회전매체를 가진 완전혼합활성슬러지 공법을 이용한 온천지구 하수의 재이용
김홍태,김학석 한국환경과학회 2002 한국환경과학회지 Vol.11 No.1
본 연구는 SMMCMAS공법을 이용하여 수리학적 부하율을 211.3∼126.8ℓ/㎡/d로 운전하여, 도시 온천지구에서 배출되는 하수를 처리하여 재이용을 검토하였다. 평균 BOD 제거효율은 90% 이상으로 높게 조사되었으며, 최대 BOD 제거효율은 수리학적 체류시간 2.0hrs 및 수리학적 부하율 158.5ℓ/㎡/d에서 94%로 나타났고, 그때의 유출수 BOD 농도는 1.1㎎/ℓ로 나타났다. 또한 최적의 유출수 처리효율은 특정한 수리학적 부하율에서 나타났으며, 수리학적 부하율이 적정치를 벗어나 증가하거나 감소할 경우, BOD 제거효율의 감소가 발생하였다. 전체 저리공정에서 BOD 농도는 평균 2.1㎎/ℓ(최대 1.1㎎/ℓ)로 상수원수 수질기준 2등급으로 처리가 가능하며, 이는 중수도 수질 기준인 10㎎/ℓ 이하로 사용기준에 적합하고, 최적의 운전 조건으로 운전할 경우, 상수원수 1급수 수질에 상응한 유출수질을 얻을 수 있다. 최적의 운전 조건으로 수리학적 부하율은 158.8ℓ/㎡/d, 수리학적 체류시간 2시간, MLSS 1161㎎/ℓ 및 슬러지 생산량은 0.01gVSS/gBODrem/d로 나타났다. 유입수의 TKN 및 TP의 농도는 각각 3㎎/ℓ와 1㎎/ℓ로 낮고, 유출수, 또한, 0.45 및 0.43㎎/ℓ로 낮아 본 연구에서 고려하지 않아도 가능한 것으로 나타났다. This study was performed to evaluate an applicability of the SMMCMAS system for reuse of the sewage from spa area and was operated to HLR(Hydraulic loading rate) of 211.3 to 126.8ℓ/㎡/d. The operating HRT(Hydraulic retention time) ranges were 2.5 to 1.5 hours. Conclusions are as follows; At the optimum HLR of 158.5ℓ/㎡/d(HRT of 2.0 hours), the maximum BOD removal efficiency was 94% and the effluent BOD concentration was 1.1㎎/ℓ in result. As the HLR was increased to 211.3ℓ/㎡/d, BOD removal efficiency was decreased to 75% and BOD removal efficiency was also reduced to 74% at lower HLR of 126.8ℓ/㎡/d. It shows that the maximum BOD removal efficiency occurs at an optimum HLR value and that the removal efficiency decreases when the HLR is either higher or lower than the optimum value. Sludge production rates were ranged 0.01 to 0.24gVSS/gBODrem/d and accomplished to 0.01gVSS/gBODrem/d at the optimum HLR of 158.5ℓ/㎡/d.
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