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중공사분리막 모듈이 침지된 고액분리조를 이용한 활성슬러지의 고액분리
박헌휘 湖西大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.21 No.-
In this study, solid-liquid separation of permeates from the final aerobic basin was performed using solid-liquid separation basin containing hollow fiber membrane modules(SLSBM). The MLSS value of the final aerobic basin and the SLSBM was about 5,500㎎/L in both cases. When the air flow was increased from 30 Nm^2/hr to 45Nm^2/hr, the water flux(ℓ/m^2·hr) was increased 20% and the fouling of the membrane was reduced. The water flux was also measured at various operating conditions such as suction time, idle time and backwashing time. When the backwashing time was increased twice without an idle time, the flux was increased 20%. When the backwashing time was increased twice with 10 or 20 sec. idle time, the flux was increased 30%. The experimental results indicated that suspended solids(SS) and turbidity were removed about 99%. In addition, the organic(COD_Mn) removal efficiency of SLSBM was 2 times higher than that of the conventional activated sludge process.
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침지형분리막 활성슬러지공정을 이용한 염색폐수처리 및 재활용 기술개발
朴憲輝 호서대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.19 No.-
Dyeing wastewater is high in toxicity, as it accounts for 24 percent or total pollution load, while the dyeing industry occupies only 6 percent of the total wastewater generating industries and 4.5 percent of total wastewater discharge. Immerged membrane active sludge process makes it possible to use the wastewater to recycle for industrial water. The process has its base on the active sludge process, which is effective in eliminating BOD. The efficiency of ENE-Immerged Membrane was verified by the raw wastewater from B dyeing factory. The innovative process showed 99.7% CODMn rejection rate and 99.9% BOD rejection rate from the raw wastewater with CODMn 4800 mg/ℓ, BOD 2300 mg/ℓ, and SS 7800 mg/ℓ.
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박헌휘,함성원,목영선 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
저온 플라즈마 기술의 하나인 펄스 코로나 방전을 이용한 질소산화물 제거기술에 대하여 살펴보았다. 운전전력 저감방법으로서 에틸렌이나 프로필렌과 같은 올레핀계 탄화수소 첨가제를 사용하였고, NO의 산화반응기구에 있어서 이들 탄화수소 첨가제의 역할을 고찰하였다. 프로필렌은 현재까지의 가장 우수한 첨가제로 알려져 있는 에틸렌보다도 운전전력 저감에 있어서 훨씬 우수한 성능을 나타내었다. 고전압 방전에 의해 발생되는 다양한 종류의 성분 중에서 어떤 성분이 NO의 산화반응에 핵심적인 역할을 하는지 알아보기 위한 이론적 분석 및 실험을 통하여 오존이 NO의 산화에 있어 가장 중요한 성분임을 확인하였다. 이러한 결과는 펄스 코로나 방전에 의해서 뿐만 아니라 배가스에 오존을 주입하여도 질소산화물의 제거가 가능하다는 증거이며, 그 가능성은 실험을 통하여 입증되었다. 펄스발생회로의 구성요소 중 펄스형성축전기의 정전용량을 코로나 반응기 초기 정전용량의 5배로 하였을 때 최대의 에너지 이용효율이 얻어졌다. The removal of nitric oxide by a pulsed corona discharge process was investigated. As an energy saving technique, the addition of hydrocarbons such as ethylene and propylene to flue gas was examined, and the scheme for the oxidation of NO facilitated by hydrocarbon was discussed. Compared to ethylene known as the most powerful additive, propylene gave much better performance in the conversion of NO. From the theoretical and experimental analyses performed to find out active component dominantly affecting the oxidation of NO, ozone was found to play a major role in the oxidation of NO. It indicates that the removal of NO is also possible by injecting ozone to flue gas as well as by inducing corona discharge. The possibility for the removal of NO using ozone was experimentally proved. Maximum energy utilization efficiency for the removal of nitric oxide was obtained when the pulse-forming capacitance in the pulse voltage generator was five times larger than the geometric capacitance of the corona reactor.
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박헌휘,최호상 한국막학회 2002 멤브레인 Vol.12 No.2
침지형생물막 반응조와 역삼투막을 이용하여 염색폐수를 공업용수로 재이용하기 위한 실험을 수행하였다. 실험실과 현장의 pilot plant 실험 결과 20-25 cmHg의 흡인압력으로 10 LMH($1/m^2$.hr)의 투과유속을 얻었다. 침지형생물막 반응조에서 CODcr, $COD_{Mn}$ 및 T-N의 제거율은 각각 93%, 90%, 60%로 나타났다. 난분해성 물질과 총질소의 제거효율을 높여서 염색폐수를 공업용수로 재이용하기 위한 침지형생물막 반응조와 역삼투막(SMBR+R/0)을 조합한 공정을 수행한 결과, 질소제거율이 80% 이상으로 총질소 농도를 15 mg/L를 얻었다. 조합공정은 염색폐수를 공업용수로 재이용하기에 적합하였다. Submerged membrane bioreactor(SMBR) and reverse osmosis(R/O) systems treated dye wastewater for reusing of industrial water. The permeate fluxes of SMBR at 20-25 cmHg of lab. test and field test were 10 LMH($1/m^2$.hr) all test. Removal efficiencies of CODcr, $COD_{Mn}$ and T-N were 93%, 90% and 60% in the SMBR, respectively The advanced treatment of combined process(SMBR+R/0) was accomplished for increasing the removal efficiency of non-biodegradable materials and T-N. Therefore, the removal efficiency of T-N obtained in 80% above, then nitrogen concentration was under 15 mg/L. The combined process(SMBR+R/0) was suitable to reuse of the dye wastewater.
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박헌휘 한국에너지학회 1998 에너지공학 Vol.7 No.2
본 연구에서는 벤토나이트 혼합액의 유동특성 등을 파악하기 위형 전단속도에 따른 점도의 변화를 측정하였으며, 박막형성에 관한 특성을 파악하기 위하여 혼합비 및 점도에 따른 박막두께를 측정하였다. 또한 건조 후 박막이 박막의 두께에 따른 오염표면에서 분리되는 특성을 조사하였으며 벤토나이트의 흡착성능에 영향을 미치는 비표면적을 측정하기 위하여 BET 방법을 이용하였다. 점도는 혼합비의 증가에 따라 감소하였으며 건조박막의 두께는 혼합비가 증가할수록 두꺼워진다. 건조박막의 분리특성은 혼합비가 5에서 10% 이내로 박막이 40에서 150$\mu\textrm{m}$가 적당하다. In this study, the effect of shear rate on the viscosity variation is examined to understand the flow characteristics of the mixture of bentonite and water. The variation of film thickness according to mixing ratio and viscosity is measured to characterize the film formation. And, the separation of dried film is studied according to film thickness. Specific surface area affecting on adsorption capability is measured using BET method. The viscosity decreases and the film thickness increases as the mixing ratio increases. The separation characteristic of dried film is suitable within a range of 40 to 150 ${\mu}{\textrm}{m}$ in film thickness and 5 to 10% in mixing ratio.
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박헌휘,이춘수,최승우,함승주 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-
저압 기상 영역에서 Anhydrous HF 가스와 Methanol vapor를 사용하는 산화막 식각공정을 수행하기 위하여 (1) 반응기 부피의 최소화, (2) 공정압력의 최소화, (3) 고순도 알루미나 Reactor 적용, (4) Cluster화의 개념을 적용한 VPC 장치를 제작하였다.Wafer의 온도, HF의 분압 및 Working Pressure 등의 공정변수에 따른 Oxide Wafer의 식각특성의 변화를 확인하였다 또한 Etch Uniformity를 향상시키기 위하여 Shower Head의 구조를 변경시켜서 실험하였으며, CFD Simulation을 이용하여 Reactor 내에서의 HF gas 및 Methanol vapor의 분율을 예측하였다.
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朴憲輝 연세대학교 대학원 1973 원우론집 Vol.1 No.1
This investigation was carried out to produce hemihydrate calcium sulfite which can be used for building materials, medical plasters, and other goods from the home made gypsum. In order to proceed this experiment, the primary factors were assumed to be reaction temperature, pressure, operation time and the ratio of water-gypsum. Optimum conditions in this experiment were measured in an autoclave. On the other hand, theoretical representation of spray drying was derived under the sufficient assumptions and from a mathematical model, and compared with the experimental results. The maximum efficiency was obtained in 69% at 210℃ of reaction temperature, 4kg/cm2 pressure, 1.5 of water-gypsum ratio and 5 hours of operation time.
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