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김우항 해양환경안전학회 2014 해양환경안전학회 학술발표대회 논문집 Vol.2014 No.06
목포해역에서 염분의 농도는 우기인 여름철을 제외한 나머지 계절에서는 30.3%에서 31.1%의 범위를 나타내고 있으나 여름철에는 27.6% 로 낮아져 담수의 유입이 많았다는 것을 알 수 있다. 8월 영산호 하구언 직 하류에서 염분의 농도는 23.6% , 목포항에서는 23.4%이였으며 장좌도와 달리도에서는 28.9%, 30.7%로 나타나 담수의 유입이 영산호에 유입되었으며 목포항에서도 혼합되지 않고 있으며 오히려 염도가 약간 낮아진 것으로 보아 목포항의..
염색폐수에서 색도와 COD제거를 위한 오존과 활성탄처리에 관한 연구
김우항 木浦海洋大學校 1999 論文集 Vol.7 No.2
The objective of this study was to determine optimum condition of ozone oxidation and adsorption capacity of activated carbon in advanced dyeing wastewater treatment. The test was performed by the demand semi-batch experiments to determine optimum reaction time and dose rate for the color and COD removal in ozone oxidation. The adsorption capacity of color and COD was compared activated carbon and ozone-activated carbon processes. The effluent of biological dyeing wastewater treatment was used in this study. It was optimized at 10 minutes of ozone contact time and 30mg/l of ozone dosage for COD removal, 20 minutes of ozone contact time and 30mg/l of ozone dosage for color removal in the dyeing wastewater treatment. The color removal was not significantly different but COD removal was higher activated carbon than ozone-activated carbon processes.
김우항,Annaliza P. Cainglet 한국환경기술학회 2019 한국환경기술학회지 Vol.20 No.6
This study assessed the effects of differing pre-treated oyster shell powder (OSP) concentration (OSP g/L) along with varying pH in the formation of calcium phosphate [Ca3(PO4)2] for the removal of phosphate in the water. The effect of acid on the regeneration of pre-treated OSP was evaluated as well. Each method includes a mixture of the PO43- solution and the pre-treated OSP which were; (1) raw OSP (ROSP) prepared using sun dried oysters hell, (2) heated OSP (HOSP) prepared by heating the shells to 750 ℃ and lastly, (3) NaOH-treated OSP (TOSP) by soaking the oyster shells to 2.5M NaOH solution. Batch and continuous mode tests were done for HOSP and the PO43-removal efficiency after regeneration by 1.2N HCl was investigated. HOSP showed higher removal compared to ROSP of up to 99 % as the pH of the solution increases to pH 10 which signifies that precipitation of Ca3(PO4)2in the form of hydroxyapatite (HAP) took place. Additionally, TOSP showed a high removal efficiency (97.5 % of PO43-removal) as the concentration increases regardless of the increase in pH. The gradual addition of NaOH in the filter column for the continuous test maintained PO43-removal. Regeneration was achieved using 1.2N of HCl solution regardless of the method of addition. Removal efficiency of PO43- was observed to reach 98 % of removal after regeneration.
김우항 목포해양대학교 서해해양환경연구소 1998 서해 해양환경연구소 학술세미나 Vol.1 No.1
The removal of intermittently applied micropollutants in biological activated carbon(BAC) and sand filter saturated by natural organic matter (NOM) removal was examined. bromophenol and phenol were used as target compounds for the removal of micropollutants such as pesticides. 200μg/1 of bromophenol and phenol were independently applied to the BAC columns which have previously been used for 6-months and 20-months and sand filter being used for 6-months. The 20-month-used BAC has reached breakthrough levels already. The used BAC columns could removal almost all of the added bromophenol by adsorption. Sand filter could remove micropollutants by biodegradation, but could not remove bromophenol applied. Phenol with lower adsorbability than bromophenol was also removed completely by BAC used for 20-months. These results suggest that intermittently applied pesticides with similar absorbabilities as phenol Bromophenol may removed by used BAC which has reached breakthrough levels.
정수처리에서 제올라이트 여과를 이용한 암모니아성질소의 제거와 재생
김우항,이승희 한국환경과학회 2004 한국환경과학회지 Vol.13 No.7
As the concentration of ammonium nitrogen could be reached 2~3 ㎎/L in the winter in the river. It was clear that the excessive concentration of chlorinated organics could be produced with the increase of chlorine addition to remove ammonium nitrogen. In the innovative ammonium nitrogen removal process, zeolite adsorption is very efficient as substitute for rapid sand filtration without other adverse quality change in the water. This study is conducted to evaluate the feasibility of ammonium nitrogen removal and regeneration by zeolite adsorption in drinking water treatment. Also, the reuse possibility of zeolite is evaluated to change the removal efficiency of ammonium nitrogen through several times of regeneration. The ammonium nitrogen was not removed in sand filter, but it was almost removed in zeolite filter during 7 days. The sand and zeolite filters have a similar result of turbidity removal. Therefore, zeolite filtration was con-firmed the removal of turbidity and ammonium nitrogen as a media. When compared KCI with NaCl as a chemical for zeolite regeneration, it is demonstrated that KCl was more efficient than NaCl in the ability of zeolite regeneration. The adsorption rate of ammonium nitrogen was almost not decreased in the results of several times of re-generation. It is indicated that both zeolite and regeneration solution were possible to reuse without variation of regeneration rate through this study.
염색폐수처리에서 유동성 메디아를 사용한 산소활성슬러지법의 평가
김우항,박영규 木浦海洋大學校 2000 論文集 Vol.8 No.1
The dyeing wastewater containing biologically recalcitrant and color producing compounds such as dyes and surfactants, is generally considered to be one the most complex wastewater with regard to treatability. At present, the activated sludge process following the chemical coagulation process is being usually used for the treatment of dyeing wastewater. Thus, it is necessary to develop the more simple treatment process to treat refractory organic pollutants color form the effluent. Oxygen activated sludge process with fluidized midia (OASFM) was tested to evaluate design parameters. In this study, the complex dyeing wastewater containing average COD_(Mn) 660 mg/l and BOD 1730 mg/l were treated by the OASFM process which operated at nearly constant MLSS 5000 mg/l. Hydraulic retention time of this process was changed from 12 to 24 hours. The effluent COD of OASFM process was 124-175 mg/l less than 161-225 mg/l of OAS process. In the OASFM process, the optimum conditions were 20 % of media packing rate and 30℃ of temperature. At that condition, the BOD removal efficiency was 99% and COD removal efficiency was 77%.
Rotational Distribution of $CO_2$($00^00)after Collisions with Hot Atoms
김우항,Kim, U Hang Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.5
By use of the rotational distribution expression previously derived based on the collisional time correlation function formalism, the rotational distributions of $CO_2$ vibrational ground state (00°0) after collisions with hot H, D, or Cl atom have been constructed. Energy and rotational quantum number parameters which can characterize the rotational distributions are also calculated and compared with those deduced from the experimental distribution. The results from this work would be very useful in predicting the rotational distributions in the lower J region for which experimental data are not available due to the interference from the ambient $CO_2$.