• Water for future
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• v.29 no.1
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• pp.191-202
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• 1996

Advanced water treatment for water supply is being introduced for the treatment of various organic materials which cannot be removed by conventional water treatment methods. While the development of advanced water treatment system appropriate to the domestic enviropment of advanced water treatment system appropriate to the domestic environment is essential, the study on the economic costs and the social impact is also of importance. In this paper, it is shown how to estimate the costs (capital and maintenance) for advanced water treatment facilities, especially those using ozone treatment combined with activated carbon process and membrance separation. Estimated costs were compared with the government budget. Also, a general relation between the system capacity and investment was derived. Four alternatives were considered form the aspect of the amount of water to be produced and the delivery system to the user. These alternatives were applied to the city of Pusan. It turned out that bottled water, produced only for drinking, has best economic advantages in having minimum system capacity without detriment to water quality.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.37 no.1
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• pp.19-24
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• 2008

• Proceedings of the Membrane Society of Korea Conference
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• 1996.10a
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• pp.64-66
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• 1996

원수 중의 오염물의 양과 종류가 급격히 증가함에 따라 기존의 정수방법은 점차 그 한계를 노출하고 있다. 이러한 문제점의 대안으로 최근 막분리기술을 도입한 고도정수처리공정이 주목되고 있다. 역삼투(reverse osmosis)와 나노여과(nanofiltration)등의 분리막을 이용한 정수처리 공정에 대한 연구가 활발히 진행되어 왔으나, 경제성이 보다 큰 한외여과(ultrafiltration, UF)와 부날활성탄(powdered activated carbon, PAC)의 결합 시스템의 도입이 연구되고 있다. 따라서 본 연구에서는 PAC-UF 시스템의 유입수에 배경물질(background organic matters, BOM)을 포함한 이성분계에서 미량유기물의 경쟁적 흡착 거동을 고찰하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.673-677
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• 2009

현재 상수시설의 경우 갈수록 악화되는 수질과 정수장의 유지관리 인원 상주의 어려움, 기존의 응집, 침전, 여과 정수처리 시스템의 처리성능 증대에 따른 한계성에 직면한 상황이다. 안정적으로 수질의 개선을 통한 장치의 컴팩트화, 유지관리가 편리한 고도정수 수질기준에 만족하는 정수처리 시스템이 필요하다. 본 연구에서는 기존의 정수처리 시설인 혼화지에 응집제와 함께 다양한 비중을 가지고 있는 모래입자를 투입하여 응집제와 모래의 결합에 따른 탁도 제거효율과 슬러지의 양을 비교하였으며, 침전지내에 정류벽을 설치하여 침전지 초반에 가라앉을 수 있도록 유도하여 탁도 및 슬러지양을 비교하였다. 응집제만 투입한 경우보다 시료를 투입한 경우가 탁도제거율과 슬러지양이 상승하는 것을 볼 수 있으며 그중에서도 규사의 경우가 가장 많은 탁도제거율의 상승을 나타냈다. 또한 이중 정류벽을 설치하여 탁도 및 슬러지양을 측정한 결과 이중정류벽을 설치하지 않은 경우보다 탁도제거율 및 슬러지양 또한 높게 측정되었으며 슬러지의 양 또한 침전지 앞부분에 집중되는 것으로 나타났다. 이러한 경우 상기 플럭의 질량이 증가하기 때문에 처리속도를 높이고, 체류시간을 줄이고, 처리를 효율적으로 안정되게 수행하는 것이 가능하다. 본 연구결과를 바탕으로 정수시설의 설치에 있어 시료와 이중정류벽을 함께 사용할 경우 응집제의 절감 또는 침전지의 컴팩트화를 가져올 것으로 예상된다.

• Environmental engineer
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• v.24 s.247
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• pp.14-19
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• 2007

• 수도
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• s.51
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• pp.73-78
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• 1990

• Journal of the Korean GEO-environmental Society
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• v.14 no.4
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• pp.15-27
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• 2013

In order to plan out the Daegu G membrane filtration water treatment plant, water quantity, water quality and process stability were evaluated using the field pilot-scale tests, during the six months of continuous operation, including low water temperature period. The field model experiments, which were carried out according to the Installation Criteria of Ministry of Environment, consisted of two series : series 1 - water quality verification, and series 2 - membrane process evaluation. The process water quality met all drinking water standards with less than 0.03 NTU. Moreover, process operation showed a stable membrane pressure with 99% of recovery ratio. This shows that the tests were properly designed in terms of the influence of water loading and temperature. In conclusion, the purpose of this study is to establish core technology for advanced drinking water treatment, through on-going accumulation of engineering and construction know-how.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.7
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• pp.743-750
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• 2008

In water treatment plant the Dissolved Ozone Flotation(DOF) System may be employed because this system has various abilities, such that it can remove SS using microbubbles, and it can exert strong oxidation power in removing taste and odor, color, and microbial agents. In order to investigate effectiveness of the DOF system in water treatment, removal characteristics of various water quality parameters were observed depending on the different levels of ozone concentrations. Removal efficiencies of water quality parameters in DOF system were compared with those in DAF(Dissolved Air Flotation) system and in CGS(Conventional Gravity Settling) system. Optimum ozone dose obtained in the pilot experiments was 2.7 mg/L. With increasing ozone dose higher than 2.7 mg/L, removal rates of turbidity, KMnO$_4$ consumption, UV$_{254}$ absorbance, and TOC were reversely lowered. High concentration of ozone dissociate organic matter in water, so that increasing dissolved organic level in effluent. Removal rates of water quality parameters at optimum ozone dose were obtained, such that removal rates of turbidity, KMnO$_4$ consumption, TOC, and UV$_{254}$ asorbance were 88.9%, 62.9%, 47%, and 77.3% respectively. Removal rate of THMFP was 51.6%. For all the parameters listed above, the DOF system was more effective than the DAF system or the CGS system. It is found that the DOF system may be used in advanced water treatment not only because the DOF system is more efficient in removing water quality parameters than the existing systems, but because the DOF system is also required smaller area than the CGS system for the treatment plant.

• 수도
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• s.62
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• pp.69-79
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• 1993

• Membrane Journal
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• v.19 no.3
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• pp.194-202
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• 2009

In this study periodic water-back-flushing using permeate water was performed to minimize membrane fouling and to enhance permeate flux in advanced water treatment by tubular ceramic ultrafiltration membrane for Gongji stream in Chuncheon city. The back-flushing period (FT, filtration time) 2 min with periodic water-back-flushing of 15 sec showed the highest value of dimensionless permeate flux (permeate flux vs. initial permeate flux), and the lowest value of resistance of membrane fouling. Also in the results of BT effect at fixed FT 10 min, BT (back-flushing time) 20 sec showed the lowest value of resistance of membrane fouling and the highest value of dimensionless permeate flux, and we could be obtained the highest total permeate volume of 107.3 L. Consequently FT 10 min and BT 20 sec could be the optimal condition in Gongji stream water treatment, which was the exactly same results of our previous tubular alumina microfiltration. Then the average rejection rates of pollutants by our tubular ceramic UF system were 97.0% for turbidity, 32.1 % for chemical oxygen demand by manganese method, 28.8% for ammoniac nitrogen and 54.4% for T-P.