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.

슬러지의 특성을 고려한 폭기 생물막 여과지의 여과저항해석

현길수 ( Kil Soo Hyun ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.5

The objective of this study was to establish a kinetic of biofiltration headloss development in biofilm aerated filter (BAF) bed considered a sludge characteristics based on the theory of headloss build-up in the sand filter bed. A kinetic analysis of biofiltration headloss development was based on the theory of sand filtration headloss proposed by Kozeny-Carman. As a result, the substrate removal of the BAF bed at steady state showed an exponential decrease trends with increasing filtration time. A modified biofiltration headloss equation introduced a specific deposit including air bubble and solids such as particle and biomass including suspended solids and soluble microbial products (SMPs) and a corrected coefficient of headloss into the sand filtration equation proved to be applied for the kinetic analysis of biofiltration headloss development in the BAF bed.

기존 하수처리시스템과 전기투석공정을 이용한 침출수처리시스템의 구성에 관한 연구

현길수(Kil Soo Hyun) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.4

N/A The purpose of this research was to evaluate the optimal configuration of wastewater treatment processes for an advanced treatment of leachate in order for the reuse of leachate and river revival. The leachate from the landfill of incinerated ashes was used as raw water. Leachate treatment system used for this research consists of existing advanced wastewater treatment system (AWTS) of full-scale plant and electrodialysis(ED) process of pilot-scale plant. The AWTS consists of activated sludge process(AOAO), trickling filter(TF), flocculation-sedimentation basins(F-S), sand filters(SF), and GAC beds. Based on the results of this researches, AOAO process was considerably effective in removing nitrogen. The removal efficiencies of the AWTS were more than 90% for COD and T-N except for total dissolved solids (TDS) and ions, which was less than removal efficiency of 5%. TDS and ions removals by ED alone averaged 95%, which indicates that it was considerably effective in separating TDS from the leachate. For the optimal configuration of leachate treatment system, organic matter in influent wastewater was considered to be adequate as an alternative external carbon source of methanol for denitrification of the AOAO process. Biological-film filtration process as an alternative process of TF, F-S, and SF was evaluated to be effective in removing residual organics, nitrogen, and SS of effluent from AOAO.

도시하수의 생물학적 영양염류제거를 위한 혐기호기생물막공정의 처리특성

현길수 ( Kil Soo Hyun ) 한국수처리학회 2006 한국수처리학회지 Vol.14 No.3

기질농도와 여과속도변화에 따른 생물막 처리특성

현길수 ( Soo Hyun Kil ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.3

This study was performed to investigate the influence of influent organic loading rate (OLR) and filtration velocity CR`) on biofilter and bioreactor performance as well as biofilm growth and granule formation of sludge. Influent concentration were in the range of <700 mg COD/L, <35 mg T-N/L. and <3.7mgT-P/L. Biofilter was packed with ceramic ball (CB) and polyethylene cube (PC) as filter media. Applied filtration velocity and HRT for biofilter and bioreactor was <400 m/d and < 3h. The substrate residual ratio of the biofilter and the bioreactor increased linearly and exponentionally with increasing R/ and HRT. The substrate reduction of the biof liter decreased considerably at FV >l00m/d. At the OLR of 0.038 kg COD/m3.d, 2.90gTN/m3.d, and 0.536 QTP/m3.d, the substrate residual ratio of the biofilter and the bioreactor increased logarithmically and linearly with increasing OLR. The substrate residual ratio of <0.4 in the biofilter and the bioreactor were achieved at about <0.03 and <0.015 kg/m3.d for COD, <2.5 and <1.0 g/m3.d for T-N, and <0.3 and <0.1 g/m3.d for T-P, respectively. The bioreactor using granular sludge is more appropriate for the treatment of the wastewater with high organic concentration compared to the biofilter.

혐기, 호기생물막법에 의한 혼합하수의 고도처리

현길수 ( Kil Soo Hyun ) 한국수처리학회 2002 한국수처리학회지 Vol.10 No.4

N/A In order to remove nonbiodegradible materials as well as 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 anaerobic-oxidation biofilm process (AOBP) using ceramic media of new biological process. The AOBP 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, a mixed domestic wastewater with nightsoil and leachate resulted in increase of nitrogen and phosphorus levels with heavy metals. At volumetric loadings of 0.08∼0.62 ㎏ BOD/㎥.d, 0.06∼0.36 ㎏COD/㎥.d and 0.07∼0.64 ㎏SS/m3.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 mg/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 the AOBP system, 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.

슬러지의 고율입상화에 따른 반응조의 구성조건

현길수 ( Kil Soo Hyun ),이형옥 ( Hyeong Ok Lee ) 한국수처리학회(구 한국수처리기술연구회) 2011 한국수처리학회지 Vol.19 No.1

This study was performed to investigate an optimum configuration of bioreactor for high-rate sludge granulation using synthetic wastewater. Seed sludge for forming granules was taken from the aeration tank in existing treatment plant. As a result, the reductions of COD were >70% at DO <2mg/L and >80% at DO >3mg/L, respectively. This indicates that DO concentration of >3mg/L is appropriate for efficient organic reduction. Sludge volume index (SVI) decreased from 100 mL/g to 40 mL/g, while settling time of the reactor increased 10m/h to 30m/h. This is due to that granules size increased 0.4mm to >1.2mm. The fraction of granules decreased non-linearly for settling time and linearly for discharge time, while it increased with the increase of exchange ratio. Therefore, the results indicate that a greater height/diameter (H/D) ratio of the bioreactor is needed to form a good granules and enhance substrate reduction.

침출수 고도처리수의 재이용을 위한 막분리 공정의 적용

현길수 ( Kil Soo Hyun ) 한국수처리학회 2010 한국수처리학회지 Vol.18 No.6

This study was conducted to investigate the reuse of the effluent from advanced landfill leachate treatment system, which consisted of anaerobic/aerobic activated sludge process, biofilm process, and sand/GAC filtration processes. Pilot-scale plant for this experiment consists of coagulation-sedimentation process and membrane process (reverse osmosis(RO) and electrodialysis (ED) membrane). As a result, the removal efficiencies of the coagulation-sedimentation were more than 95% for Ca2+ and 75% for SiO2. This indicates the pretreatment is necessary for maximizing the efficiency of membrane process. For membrane process, the removal efficiencies of RO and ED on total dissolved solid (TDS) and ions of chlorine and calcium were more than 95%, which describes it was considerably effective in separating saline solution from the leachate contaning high salts concentration. The water quality of main stream was kept as 1st grade due to the inflow of a filtrated leachate by the membranes. This results show that a treated leachate by RO or ED process was adequate for reuse as recharge water to river.

정수중의 THM과 HAA의 거동

현길수 ( Kil Soo Hyun ),김영진 ( Young Jin Kim ),최윤영 ( Yun Young Choi ) 한국수처리학회 2005 한국수처리학회지 Vol.13 No.1

N/A In the chlorination process, aquatic organic matter serves as a precursor to the formation of potentially harmful disinfection by-products(DBP) such as trihalomethanes (THMs), haloacetic acids (HAAs), and total organic halides(TOX). Formed THMs are chloroform, bromodichloromethane, dibromochloromethane, and bromoform. the formed HAAs are monochloroacetic acid (MCAA), dichloroacetic acids (DOM), trichloroacetic acids (TOM), monobromoacetic acids (MBAR), and dibromoacetic acids (DBAA).The formation of disinfection by-products(DBPs) is one of the major issue for drinking water quality control. Whenever raw water or organic compounds extracted from natural water are chlorinated, significant concentrations of THMs and HAAs are produced. With recent advances in the analysis of chlorination by-products and their health effects, numerous organic halides HAAs, THMs, haloacetonitriles, etc have been identified at low level. In this study, the distribution profiles of disinfection by-product(DBP) formation by the chemical reactivity with chlorine was investigated among the water treatment plants(WTP)-HMWTP, DSWTP, and MJWTP-located at lower basin of the Nakdong river. The raw waters used were river water for HMWTP and DSWTP and lake water for MJWTP. As a results, the distribution of THMs and HAAS speciation in the finished water of the water treatment plants showed in the order: for the formed THMs, CHCl₃ of 49~62%, CHCl₂Br of 26~27%, CHCIBr₂ of 10~20%, CHBr3 of 1~5%, and for the formed HAAs, DCAA of 41 -51%, TCAA of 23~38%, DBAA of 18~30%, MBAR of 2~5%, MCAA of 0%, which showed the dominant compounds were CHCl₃ and CHCl₂Br for THMs and DCAA and TCAA for HAAs, respectively. Configuration of DBPs with the raw water used evealed the CHCI₃ concentration of THMs were higher in both HMWTP and DSWTP than in MJWTP, and TCAA of HMs were higher in both HM and DSWTPs than in MJWTP. Based on the results of the batch experiment to evaluate the function of sand filter on DBPs removal, HAAs could be seen to be removed by the biodegradation by the microorganism grown in the sand filter. The concentrations of THMs and HAAs in distribution system were 1.3~1.6 and 1.4~2.1 times higher than in final water of the WTPs, respectively, so it indicates that the concentrations of them increases with the increase of pipeline distance from the WTPs.

혐기성 처리공정에 의한 기름성분 함유 유기성 고농도폐수의 전처리 특성

현길수(Kil Soo Hyun),최정우(Jeung Woo Choi),강용태(Yong Tae Kang) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.1

최근 들어 기름성분(oil과 grease)의 사용량이 증가하므로서 하·폐수의 성상이 난분해성 물질의 증가와 동시에 고농도화 되고 있는 시점에서 본 연구에서는 기름성분을 다량 사용하는 업소(산업시설, 레스토랑, 주거시설)에서 배출되는 하·폐수들의 특성조사와 이들 폐수에 대한 전처리 시설로서 혐기성 처리공정을 도입하여 그 처리특성을 조사하였다. 실험결과 하.폐수특성의 경우, 레스토랑의 배출수가 다른 배출수보다 영양염류(TKN과 T-P)농도는 높은 반면에 알칼리도는 낮았다. 혐기성 처리공정에 의한 생화학적 메탄생성(BMP) 실험결과 레스토랑의 배출수가 다른 배출수에 비해 생분해성 물질의 농도가 높았고, COD제거의 경우 모든 하·폐수에 대해 유입수농도 16,000∼47,000㎎COD/L정도에서 약 70%이상의 양호한 제거율을 보였고, 58,000㎎COD/L이상에서는 5%이상의 아주 낮은 제거율을 보였다. N/A