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김상구,류동춘 ( Sang Goo Kim,Dong Choon Ryou ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2
This study was conducted through jar-test and pilot-plant test to research coagulation effect of pre-ozonation on the contaminated water by organic matter (TOC), inorganic matter (kaolin) and algae specially diatom (chlorophyll-a). Pre-ozonation had not coagulation effect on the kaolin water further more acted as coagulation deteriorator on the organic matter water which imvolved humic acid more than 2㎎/ℓ as total organic carbon (TOC). But it had good coagulation effect on the nutriented water more than 40μ/ℓ as chlorophyll-a. Therefore pre-ozonation utility is desired for treating nutriented source water. We had added ozone to the netriented raw water increasingly 1㎎/ℓ from 1 to 5㎎/ℓ, About l∼3㎎/ℓ ozone treated water was appeared lower residual turbidity than of 5㎎/ℓ ozone contacted water and untreated water after jar-test. Compared residual turbidity of l㎎/ℓ ozone treated water to 3㎎/ℓ, we did not find significant difference of residual turbidity between two jar-test data. So we proposed 1㎎/ℓ as optimum pre-ozone dose for nutriented water. And pre-ozonation process had better coagulation effect to the higher chlorophyll-a concentration water. Authors also found out that pre-ozonation could save coagulant about 25%.
김상구 ( Sang-goo Kim ),박현석 ( Hyun-seog Park ),손희종 ( Hee-jong Son ),이정규 ( Jeong-gyu Lee ),류동춘 ( Dong-choon Ryu ),유평종 ( Pyung-jong Yoo ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.7
The H water treatment plant has been operating since 1982 and has had no renovation. It is assumed that the filters have been operated for more than 30 years and therefore are deteriorated. Many of the filters show an unequal state of air scouring during backwashing. For this study one filter, which was presumed most deteriorated among eighteen filters, was selected as a model filter for renovation. Some of the effects seen after renovation of the underdrain system were a lower average filtrated turbidity by approximately 0.02 NTU and an equal backwash state throughout the filter bed. Sand wash efficiencies by backwash before renovation of the underdrain system were 28%, 8%, and 5% at the surface, 50 cm depth, and 100 cm depth, respectively, and after renovation of the underdrain system were 94%, 26%, and 15% , respectively. The standard deviation of the effective sand size was 0.025-0.033 mm before renovation of the underdrain system and 0.002-0.011 mm after renovation of the underdrain system, meanings there was equal backwash pressure throughout the filter. Filtration time after renovation was approximately 2 times longer than before renovation.
김상구 ( Sang Goo Kim ),손희종 ( Hee Jong Son ),정종문 ( Jong Moon Jung ),류동춘 ( Dong Choon Ryu ),유평종 ( Pyung Jong Yoo ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.9
This study carried out continuous column test for estimating the regeneration efficiency with regeneration times and temperatures. More times regenerated granular activated carbon (GAC) has more ash in the GAC and has less apparent density. Two times regenerated GAC (2nd re-GAC) could removed the Trihalomethanes (THMs) in the water for the first two week after starting continuous column test, on the other hand five times regenerated GAC (5th re-GAC) did not have adsorption capacity. The THMs concentration in the effluent was almost equal or higher than that of influent at the first time of continuous column test. 2nd re-GAC showed much more DOC adsorption capacity than 5th re-GAC and the GAC which was regenerated with 700 ℃ had highest DOC removal efficiency among the GACs with 600, 700, 800, 900 ℃ regeneration temperatures. It is anticipated the cost of GAC regeneration could be saved more 100 million won by reducing the furnace temperature of 3rd~4th and 5th~6th about 150 ℃ compared to the current regeneration condition.
정수처리용 활성탄 공정의 적정 역세척 시점 선정을 위한 영향인자들 평가
김상구 ( Sang Goo Kim ),박홍기 ( Hong Gi Park ),손희종 ( Hee Jong Son ),염훈식 ( Hoon Sik Yoom ),류동춘 ( Dong Choon Ryu ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.12
In Korea, many drinking water treatment plants (DWTPs) have introduced and are going to introduce biological activated carbon (BAC) process to treated dissolved organic matter (DOM) in water which are difficult to control by conventional water treatment processes. Even though more decade have passed since introduced BAC in Korea, most of BAC operating method was followed to the modified sand filter operating manuals. In case of BAC backwashing, many DWTPs set the periods of backwashing about 3∼5 days. In this study, we have collected data to set the proper BAC backwashing periods from both pilot-plant and real DWTPs. We had measured heterotrophic plate count (HPC), turbidity, water temperature, dissolved organic carbon (DOC) and headloss from just after backwashing to the next backwashing time for two years. Considering water quality factors, the BAC run time from backwashing to the next backwashing could extend more 30 days without water quality deterioration if the head loss do not reach the limited level which depends on each BAC facilities’ condition. It means the BAC treated water could be saved in the proportion of extended the backwashing period to the existing backwashing period.
배은영(Eun Young Bae),류동춘(Dong Choon Ryu),김상구(Sang Goo Kim),손희종(Hee Jong Son),나영신(Young Shin Na),송미정(Mi Jeong Song),최동훈(Dong Hoon Choi) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.4
We have researched removal of organic matters as DOC, THMFP and UV254 with pre-ozonation. filtration, post-ozonation and 3 kinds of granular activated carbon(GAC) by using the Nakdong river`s water for evaluating removal characteristics of organic matters on each treatment process. UV-254/DOC(SUVA) and THMFP/DOC(STHMFP) can be valuable parameters for evaluating each processes and finding more effective process by comparing the removal of specific organic and DOC before and after treatment. The removal of DOC. THMFP and UV-254 by pre-ozonation are 0%, 25%, 30% and by filtration are 33%, 52%, 46% and by post-ozonation are 7%, 7%, 36% and residual rate of SUVA and STHMFP by pre-ozonation are 0.68. 0.75 and by filtration 0.8, 0.79 and by post-ozonation 0.69, 1.0 respectively. The reason of higher removal of THMFP and UV-254 than DOC is hydrophobic organic matters are more easily removed by ozonation and coagulation than hydrophilic organic matters. The removal of DOC are 21%, 26%, 21% and THMFP are 27%, 40%. 30% and UV-254 are 22%, 26%, 14% and residual of SUVA are 1.0, 0.91, 1.1 and STHMFP are 0.97, 0.83, 0.93 by coconut, coal, wood base GAC. Residual of SUVA are over than 1.0 by coconut, wood base GAC treatment because UV-254 could not be easily removed by biomass on the surface of GAC but residual of SUVA is lower than 1.0 treated by coal base GAC treatment because UV-254 can be easily adsorbed into the residual pore.
최근주(Keun Joo Choi),김상구(Sang Goo Kim),손희종(Hee Jong Son),류동춘(Dong Choon Ryu),류재익(Jae Ick Ryoo),손인식(In Sik Son) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.1
Japan Environmental Agency announced 14 kinds of endocrine disruptors was detected on 130 watersheds of Japan in 1998 and the Ministry of Environment of Korea announced 13 kinds of endocrine disruptors involving Bisphenol-A was detected in domestic watersheds in 2000. According to the report, bisphenol-A, nonyiphenol and 4-n-heptylphenol were detected in all domestic watersheds. This study was carried out for finding removal method of 13 species of endocrine disruptors on water treatment processes. The concentrations of prepared endocrine disruptors standard water were about 10 ㎎/L and we analyzed the concentration of endocrine disruptors by W Absorbance. All 13 pieces of endocrine disruptors could be absorbed into the powder activated carbon(PAC) and the phthalates(DBP, DEP, DEHP) could be coagulated but other endocrine disruptors could not be coagulated by coagulant. Ozonation showed that it could not remove endocrine disruptors by measuring W Absorbance, but other researchers reported ozonation could transfered endocrine disruptors to isomer.
입상활성탄 주기적 누적충진에 따른 용존유기탄소와 THMs 처리능 평가
손희종(Hee-Jong Son),김상구(Sang-Goo Kim),서창동(Chang-Dong Seo),염훈식(Hoon-Sik Yoom),류동춘(Dong-Choon Ryu) 대한환경공학회 2017 대한환경공학회지 Vol.39 No.9
본 연구는 입상활성탄을 일시에 100% 충진하는 방법과 일회 충진양을 50%, 33%, 20% 및 10%로 나눠서 주기적으로 누적 충진하였을 경우에 대해 THMs과 DOC 처리효율 변화를 비교 평가하기 위해 수행하였다. 일시에 100% 충진하는 방법은 운전 초기에는 THMs와 DOC의 유출농도가 낮았으나 운전기간이 증가할수록 높은 유출수 농도를 나타내었다. 반면 주기적 누적충진 방법을 적용한 경우에는 유출수의 THMs와 DOC 농도가 운전기간 동안 상대적으로 균등하게 유지하였다. THMs 흡착제거에는 주기적 누적 충진법이 전체 충진용량을 일시에 충진하는 방법에 비해 효과적이었으나, 활성탄 공정 유입수 THMs 구성종들 중에서 클로로디브로모메탄이나 브로모포름의 함량이 클로로포름이나 브로모디클로로메탄에 비해 월등히 높은 경우에는 주기적 누적충진법에 비해 전체 충진용량을 일시에 충진하는 방법이 더욱 효과적인 것으로 나타났다. DOC의 제거에서는 충진용량을 일시에 충진하여 운전하는 방법이 주기적 누적충진법에 비해 DOC의 총 흡착량과 유출수의 평균농도 측면에서는 유리하였다. 활성탄 공정 운전기간 동안 THMs와 DOC 제거율의 균등화에는 주기적 누적충진 방법을 적용한 경우가 효과적이었고, 적은 양의 활성탄을 주기적으로 자주 충진하는 방식이 더욱 유리하였다. In this paper, the removal efficiency of THMs (Trihalomethanes) and DOC (Disolved organic carbon) was compared under different GAC (Granual activated carbon) filling methods. One method is “full filling method” in which column is fully filled with GAC at once and the other is “periodic cumulative method“ in which column is partially filled with GAC (10, 20, 33 and 50% of total column volume) and added each ratio during 300 days. The effluent concentration of both THMs and DOC under full filling method was low during the initial period, however, steadily increased with operating time. In the contrast, with periodic cumulative method, it maintained (relatively) evenly during the operating period. Periodic cumulative method was more efficient for removing THMs than full filling method. However, when the ratio of chlorodibromomethane or bromoform among THMs was significantly higher than chloroform and bromodichloromethane, full filling method was more efficient than periodic cumulative method. Full filling method had benefit to total DOC removal and control of average DOC concentration in effluent. Overall, periodic cumulative method is more efficient to equalize the removal efficiency of THMs and DOC, so the more frequent refilling of column with small amount of GAC is more advantageous.