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분자량 크기별 토양 휴믹산(HA)의 구조적 특성 및 페난트렌 흡착 반응특성 비교
이두희,김소희,신현상,Lee, Doo-Hee,Kim, So-Hui,Shin, Hyun-Sang 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.7
A sample of soil humic acid (HA) was divided by ultrafiltration (UF) into five fractions of different molecular size (UF<sub>1</sub>: > 300, UF<sub>2</sub>: 100~300, UF<sub>3</sub>: 30~100, UF<sub>4</sub>: 10~30, UF<sub>5</sub>: 1~10 kilodaltons). Apparent average molecular weight (M<sub>w</sub>) of the HA fractions were measured using high performance size exclusion chromatography (HPSEC), and the chemical and structural properties of the five HA fractions were characterized by elemental compositions (H/C, O/C and w ((2O + 3NH)/ C)) and ultraviolet-visible absorption ratios (SUVA, A<sub>4/6</sub>). The organic carbon normalized-sorption coefficients (Koc) for the binding of phenanthrene to the HA fractions were determined by fluorescence quenching and relationship between the sorption coefficients and structural characteristics of the HA fractions were investigated. The elemental analysis and UV-vis spectral data indicated that the HA fractions with higher molecular weights have grater aliphatic character and lower contents of oxygen, while the HA fractions with lower molecular size have greater aromatic character and molecular polarity that correspond to greater SUVA and internal oxidation values (w). The log Koc values (L/kg C) were gradual increased from 4.45 for UF<sub>5</sub> to 4.87 for UF1. The correlation study between the structural descriptors of the HA fractions and log Koc values of phenanthrene show that the magnitude of Koc values positively correlated with $M_w$ and H/C, while negatively correlated with the independent descriptors of the O/C, w, SUVA and A<sub>4/6</sub>.
토양세척 공정에서 발생하는 토양세척수 처리를 위한 가압부상법(DAF)의 적용에 관한 연구
이신미(Shin Mi Lee),김정배(Jeung Bea Kim),박상원(Sang Won Park),최상식(Sang Sik Choi),이두희(Doo Hui Lee),허민주(Min Ju Heo) 계명대학교 낙동강환경원 2010 環境科學論集 Vol.14 No.1
The purpose of this study was to develop the soil washing recycling system by Dissolved Air Flotation(DAF) process. DAF Process was applied to contribute to environmental protection from soil restoration work that is friendly remediation of a soil washing process. The contamination removal efficiency was established from the pilot plant of waste soil washing recycling system on S company's oil storage property site in P city. It Measured treatment efficiency of whole soil washing recycling system with CODMn, SS, T-N, n-H(mineral oil), pH. The optimal operating condition of the soil washing recycling system using the Dissolved Air Flotation(DAF) process are hydraculic retention time(HRT) 10min, return ratio(RR) 50%, skimming ratio(SR) 5%.
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.
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.