정수수질 개선을 위한 입상활성탄과 생물활성탄의 처리특성

최정우(Jeung Woo Choi),현길수(Kil Soo Hyun),강용태(Yong Tae Kang) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.2

Nonbiodegradable organic carbon in the Nakdong river has been gradually increased due to the inflow of inappropriately treated domstic and industrial wastewaters. Most of the existing water treatment plants in the Nakdong river basin depend on rapid sand filtration process, which consists of prechlorination, coagulation-flocculation and sedimentation, rapid sand filtration processes. It has been inappropriate to produce good quality drinking water. Thus the objectives of this research are to optimize the operating conditions of the GAC and the BAC processes based on the results of total organic carbon (TOC), UV-254㎚ absorbance (UV_(254)), and trihalomethanes (THMs) removals. Based on the results of this research, the optimum empty bed contact time (EBCT) and packed depths of all the GAC and the BAC beds were 12 minutes and more than 320㎝, respectively. Conversion rates of dissolved organic carbon (DOC) to biodegradable DOC (BDOC) by ozonation ranged from 22 to 30%. Effect of the BAC bed on BDOC and non-biodegradable DOC (NBDOC) removals averaged 44% and 19%, respectively. The removal percentage of the GAC and the BAC processes averaged 22% and 34% for TOC and 10% and 14% for THMs, respectively. For TOC removal, the BAC bed was about 10% higher than the GAC.

분포모형을 이용한 최적설계 갈수우량 분석

최정우 ( Jeung Woo Choi ),최윤영 ( Yun Yeong Choi ),이영민 ( Yeong Min Lee ) 한국수처리학회 2007 한국수처리학회지 Vol.15 No.2

세라믹 담체 Biotower 에 의한 혼합하수의 고도처리

최정우(Jeung Woo Choi),현길수(Kil Soo Hyun),김홍구(Hong Gu Kim),염국환(Gug Hwan Yum) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.2

N/A In order to remove nitrogen and phosphorus from mixtured wastewater of domestic wastewater, night-soil, and leachate from the waste landfill site, this researches were performed to evaluate a characteristics of the treatment of Biotower using ceramic media of new biological process. The Biotower process consists of anaerobic, aerobic and anoxic zones. The experiment was carried out at S Wastewater Treatment Plant, located at Kyungbuk province. Based on the results of this research, at volumetric loadings of 0.08∼0.62㎏BOD/㎥.d, 0.06∼0.36㎏COD/㎥.d and 0.07∼0.64㎏SS/㎥.d, the percentages of BOD, COD, and SS removal averaged 90%, 80%, and 90%, respectively with all effluent of less than 10㎎/L. total nitrogen(TN) and total phosphorus(TP) removal were 50% with effluent of 7㎎/L and 70% with effluent of 0.6㎎/L, respectively. Influent BOD/TN ratio ranged from 2.82 to 7.38 and BOD/TP ratio from 15.57 to 61.80. TP removal averaged 60% at TN/TP ratio of 7. At linear velocity(LV) 50m/day of Biotower, the removal rates averaged more than 85% for BOD and SS, and 70% for COD. TN and TP removals at more than LV 40m/day averaged 50% and 65%, respectively.

혼합폐수의 전처리특성에 관한 연구

최정우(Jeung Woo Choi),현길수(Kil Soo Hyun),염국환(Gug Hwan Yum) 한국수처리학회 2002 한국수처리학회지 Vol.10 No.3

N/A The influent of mixed wastewater of night-soil and leachate from waste landfill to existing wastewater treatment plant have increased, which have resulted in the increase of the levels of nitrogen, phosphorus and heavy metals in the effluent from activated sludge process. The pretreatment of the mixed wastewater needs to improve the effluent from activated sludge process. As physiochemical and biological pretreatment processes of the mixed wastewater, coagulation-sedimentation process using alum as coagulant and anaerobic-oxic biofilm process(AOBP) packed with fibrous media and honey-comb media have compared to reduce the contaminants. As a results, AOBP was more effective in reducing nitrogen, phosphorus and heavy metals than the physicochemical process:COD 20∼30% NH_4-N 30∼40%. P0_4-P 20%, heavy metals(Fe, Cr^6+) 10∼20%.

고율협기성입상슬러지 반응조의 동역학적 해석에 관한 연구

최정우(Jeung Woo Choi),현길수(Kil Soo Hyun) 한국수처리학회 2000 한국수처리학회지 Vol.8 No.4

N/A The objectives of this study using synthetic wastewater were to investigate the characteristics of high-rate anaerobic granular sludge(HAGS) process on organics removal and to analysis a reaction theory of the HAGS. As a results, COD_(Mn) removal rates at hydraulic retention time (HRT) of 0.25∼2days were 77∼95% and substrate removal was sensitive at less than the HRT of 6 hours, but stable at more than the HRT of 12hours. At COD loading rates of 0.12∼2㎏/㎥/d and influent TCOD_(Mn) of 250∼500㎎/L, MLSS and MLVSS in the reactor ranged from 28,900 to 30,130㎎/L. and from 21,010 to 22,040㎎/L, respectively. Yield coefficient (Y) and endogenous decay constant (k_d) were 0.0047∼0.095gVSS/gCOD and 0.0003∼0.0004day^(-1), respectively. The following equation for the HAGS reactor was given from the relationship between the specific substrate concentration and substrate removal rate coefficient of the second reaction rate coefficient obtained from the proposed equation of the HAGS reactor. S_e=S_0·(ψ·η/(320.8·ψ-1.755)·t_d)^½

생활하,폐수의 합병처리를 위한 혼합폐수처리시스템의 구성 및 혼합 수질예측

최정우 ( Jeung Woo Choi ),현길수 ( Kil Soo Hyun ),송인수 ( In Soo Song ) 한국수처리학회 2003 한국수처리학회지 Vol.11 No.1

N/A Using anaerobic-oxidation biofilm process(AOBP), rotating biological contactor(RBC), biological aerobic filtration (BAF), activated sludge(AS), and coagulation-sedimentation (C-S) processes as a pretreatment processes of the mixtured wastewater, this research were performed to investigate on the characteristics of the pretreatment processes and to predict the wastewater qualities mixed domestic wastewater with the mixtured wastewater of night soil and leachate, considered the reduction of organic loadings. Hydraulic retention time (HRT) of the pretreatment processes were in the range of 9 -10 hours for the AOBP, 10-12 hours for the RBC, 7-8 hours for the BAF, and 7-8 hours for the AS. The C-S experiment was carried out by Jar tester. As a results, the biofilm treatment processes(BTP) such as AOBP. RBC and BAF showed more effective 71-76% for COD, 42-64% for T-N, and 58-70% for T-P than AS and C-S, respectively. For the removal of heavy metal of Cr^(+6), the BTP as well as the C-S was extremely more effective about 50% than the AS. It indicated that the BTP was more stable and effective process as a pretreatment processes of the mixtured wastewater, compared to the AS and the C-S processes. Applied organic reduction rates of 30% and 60% by the RTP for the prediction of mixtured wastewater, the reduction efficiencies of it were 32% and 39% for COD, 10% and 15% for T-N, and 16% and 20% for T-P, respectively. Despite of the increase of two times in reducing organic loadings, the reduction efficiencies of 4∼7% resulted in an ineffective operation of the BTP.

국내 지형, 환경특성 고려 유해화학물질 거동해석 시스템 개발

정우열(Woo-Youl Jung),임동연(Dong-Yun Lim),최정우(Jeung-Woo Choi),서재민(Jae-Min Seo) 한국위험물학회 2019 한국위험물학회지 Vol.7 No.1

As the nature of recent disasters is diversified, enlarged, and complex, disasters caused by chemical accidents are more difficult to deal with than natural or man-made disasters in terms of scale and damage. In addition, the damage does not remain as a simple primary damage but leads to secondary and tertiary damage, which leads to long-term damage. Therefore, importance of initial response and restoration support is increasingly emphasized. In this study, we define the methodology of the detailed diffusion model based on a wind field model considering topography, environmental characteristics, and a leakage rate calculation model considering the container leakage and the pool evaporation. In other words, in this study developed a system that can provide more accurate response information in the event of hazardous chemical leakage accident.

고농도 염분함유 침출수의 고도처리

현길수,최정우 ( Kil Soo Hyun,Jeung Woo Choi ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.4

The objective of this research was to evaluate the configuration of wastewater treatment processes for an advanced treatment of leachate with high chlorine concentration. The raw wastewater used was leachate from the landfill of incinerated ashes of municipal wastes and contained heavy metals, ions materials, and toxic substances as well as high concentration of salts and nitrogen. The advanced wastewater treatment system used in this research consists of activated sludge process, sedimentation basin, trickling filter, coagulation-flocculation-sedimentation basins, rapid sand filters, granular activated carbon (GAC) beds, and membrane filters. As a results of this researches, using anaerobic and aerobic conditions for denitrification and nitrification, the activated sludge process removed approximate more than 90% of total nitrogen (T-N) and ammonia nitrogen (NH₄-N), which indicated that it was considerably effective in removing nitrogen. Conventional contaminants such as BOD, COD, and SS were removed more than 80% through the flocculation-sedimentation processes. Through the filtration and the adsorption, the residual contaminants except for total dissolved solids (TDS) and ions almost never removed by them were reduced less than 1㎎/ℓ, TDS and ions of chlorine and calcium removals by membrane filter (reverse osmosis, RO) alone averaged 98%, which describes it was considerably effective in sperating saline solution from the wastewater containing high salts concentration. Based on these results, it describes that the proper configuration of wastewater treatment processes is important to produce the water adequated to effluent standards, which can be expected the application of the wastewater reuse as well as the protection of water environment.

하,폐수 처리수의 수질개선을 위한 고율 생물막 공정연구

현길수 ( Kil Soo Hyun ),최정우 ( Jeung Woo Choi ),심창석 ( Chang Suk Sim ) 한국수처리학회 2004 한국수처리학회지 Vol.12 No.4

N/A The water bodys of river and reservoir have been contaminated from the effluent of the existing wastewater treatment plants mostly adopted activated sludge processes, which have treated a mixtured wastewater of domestic wastewater, night-soil, and leachate from the waste landfill site. This researches with biofilters were conducted to improve the effluents of water and wastewater treatment plants. The biofilters consist of the aerated filter with single-media layer for water treatment and anaerobic-aerobic filters for wastewater treatment. The experiments of pilot-scale plants were conducted at the field of water and wastewater treatment plants. Based on the results of this researches, COD removal of anaerobic granule biofilter was more than 90%, but COD removal decreased to less than 60% due to inhibition of ammonia when influent NH^(+)₄-N concentration was high level of 400mg/L above, which indicate the ratio of COD/NH^(+)₄-N of less than 5 was desirable to improve the quality of effluent. For the anaerobic-aerobic biofilter, on the other hand, at the influent loadings of 0.07-0.64 kgBOO/m3.d, 0.07-0.38 kgCOD/m³.d, 0.025-0.141 kgTN/m³.d, 0.004-0.026 kgTP/m³.d, the percentages of BOD, COD, T-N and T-P removals averaged from 70 to 90% with all effluent of less than 10 mgT-N/L and 1mgT-P/L. These results show the effluent of anaerobic-aerobic Biofilter will be reused as various purpose as if it will be introduced to the existing wastewater treatment system adopted activated sludge processes.

BAF와 연계한 응집.침전공정에 의한 정수처리 특성

고수현(Su-Hyun Ko),최정우(Jeung-Woo Choi),현길수(Kil-Soo Hyun) 한국산업융합학회 2000 한국산업융합학회 논문집 Vol.3 No.3

최근에 경제성장과 생활향상에 따른 물수요량이 급증함과 동 시에 소비자의 질적요구가 강화되고 있는 실정이다. 기존 상수원인 하천의 수질오염으로 인하여 소비자의 요구사항을 충족시키기 위해서는 기존 정수처리법의 개선이 요구된다. 따라서 본 연구에서는 기존 급속여과법의 전염소 처리공정 및 응집. 침전 공정의 개선을 통하여 음용수 수질을 개선하고자 하였다. 전염소 대신에 적용한 생물막여과 공정(BAF)의 처리효과 및 응집.침전 공정의 경우는 교반강도에 따른 침전효과에 따른 수질특성을 조사하였다. BAF공정은 탁월한 NH₄-N의 제거를 통하여 후 속공정에 대한 오염부하량을 저감시킬수 있었고, 응집.침전의 경우 본 연구에서 제안한 응집제 주입량에 따른 교반강도의 실험식인에 의하여 구한 최적교반강도용 용집공정에 적용시 응집.침전의 효과를 향상시킨 수 있어 음용수 수질 향상을 기대 할 수 있었다.<br/>