• Journal of the Korea institute for structural maintenance and inspection
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• v.22 no.4
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• pp.68-75
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• 2018

The introduction of advanced water treatment facilities has increased as the conventional purification method cannot remove the substance clearly. However, the internal waterproofing and Anticorrosion materials of the advanced water treatment facility using ozone deteriorate due to the oxidation power of ozone and affects the concrete, which causes a decrease in durability. This study is to evaluate the ozone resistance according to the type of spray metal and the surface treatment method of the coating, and the bond strength after ozone treatment in order to develope a finishing method to prevent deterioration of concrete structure of water treatment facility using metal spraying method as a way to construct metal panel with excellent ozone resistance and chemical resistance by an easier way than the previous. The Experimental results show that spray metal Ti has superior ozone resistance even after spraying. It is considered to be the most suitable method for ozone resistance and bond performance by finishing using Teflon sealing as surface treatment method.

• 수도
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• s.10
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• pp.66-77
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• 1977

• 한국상하수도협회지
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• s.5
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• pp.66-75
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• 2004

• 수도
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• v.24 no.2 s.83
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• pp.39-48
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• 1997

• 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.

• 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.

• 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.

• 한국상하수도협회지
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• s.5
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• pp.100-107
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• 2004

• 수도
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• v.22 no.3 s.73
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• pp.120-131
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• 1995

• Journal of the Korea institute for structural maintenance and inspection
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• v.18 no.3
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• pp.167-177
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• 2014

New technologies for water purification are continuously emerging to address global water quality problems, and one such technology involves advanced hermetic water purification facilities made by concrete that utilize ozone treatment processes. Better knowledge about surface deterioration of epoxy coating exposed to ozone treatment is needed as a foundation for development of improved methods and materials in the future. This study utilized atomic force microscopy (AFM), nanoindentation methods, and existing indirect methods such as visual observation, changes in mass, surface observation and chrominance analysis, to evaluate epoxy water-resistance and anti-corrosiveness. This study considered six different epoxy formulations to assess typical degradation characteristics of epoxy surfaces with regard to water-resistance/anti-corrosiveness. AFM and nanoindentation techniques emerged as promising direct methods with potential to provide quantitative measures of surface quality that are improvements upon existing indirect methods. The experiments also confirmed that some of the epoxy-coatings were severely iMPacted by ozone exposure, and thus the results demonstrate that concern about such deterioration is justified.