• 수도
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• v.24 no.1 s.82
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• pp.57-60
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• 1997

• Proceedings of the Korean Institute of Building Construction Conference
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• 2005.11a
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• pp.33-38
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• 2005

It is applied in the high quality equipment construction by introduction of this high duality treating technology (ozone treating, activated carbon treating, high quality oxidation treating, UV treating etc.)waterproofing or corrosion proof method caused secondary economy damage of operation discontinuance and high quality treating equipment for applying existent waterproofing method that corrosion proof ability (ozone resistance performance, chemical resistance etc.) and abrasion resistance performance by comprehension insufficiency of user and designer. Therefor, In this study, we will analyze problem of waterproofing and corrosion material of existing construction application by high quality treating, and measure physical performance change by various condition. It is required to waterproofing and corrosion system and application of the field valuation.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.05a
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• pp.177-178
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• 2015

Recently, Advanced water treatment facilities with Ozone are being introduced owing to domestic water pollution. However, waterproofing/corrosion prevention construction method of concrete structure for existing advanced water treatment makes waterproofing/corrosion prevention materials and concrete deteriorated because of strong oxidation of ozone. it causes increase of maintenance cost and water quality degradation. Therefore, in this study, it will figure out problems of waterproofing/corrosion prevention construction method being applied to through existing studies.

• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.4
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• pp.61-68
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• 2019

As the pollution of water resources deteriorates due to industrialization and urbanization, it is difficult to supply clean water through a water treatment method using chlorine. Therefore, the introduction of advanced water treatment facilities using ozone is on the increase. However, epoxy which is used as waterproofing and anticorrosives and stainless steel used in conventional waterproofing and anti-corrosive methods have deteriorated because of the strong oxidizing power of ozone, causing problems such as leaking. Moreover, it even causes the durability degradation of a concrete. Therefore, in this study, metal spraying system was used as the means of constructing a metal panel with excellent ozone resistance and chemical resistance which is an easier method than an existing construction method. Ozone resistance was evaluated in accordance with the type of metal sprayed coatings to develop a finishing method which can prevent the concrete structure of water treatment facilities from deterioration. Furthermore, electrochemical stability in actual sewage treatment plant environment was evaluated. Experimental results showed that Ti has superior ozone resistance after spraying and the electrochemical stability in the sewage treatment plant environment showed that Ti has the highest polarization resistance of $403.83k{\cdot}{\Omega}{\cdot}cm^2$, which ensures high levels of durability.

• Environmental engineer
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• s.181
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• pp.70-75
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• 2001

본 연구는 '99년 7월에 벤처형 중소기업 기술개발 지원사업으로 신규 계약된 과제로서 상수원수의 전처리 및 하수 2차 침전수의 재처리 공정에 활용될 생물 산화 여과지를 개발하는 것이다. 생물 산화 여과 system은 상수 원수의 전처리, 상수도의 고도정수 처리, 하수 및 폐수처리에 이용될 수 있는 것으로, 특히 물리적 여과기능과 포기 과정을 통한 산화 기능을 포함하는 생물학적 분해 및 자연정화처리환경을 유지하여 수질이 악화된 상수도의 전·후처리나 하.폐수의 3차 처리에 적용하기 위한 것이다. 생물 산화 여과 시스템은 여과지의 하부 장치에 균등한 공기(산소)공급시설을 하여 여과층에 연속적으로 공기를 공급하면서 여과를 함으로서 생물막 여과 및 산화 기능으로 유기물질, 철, 망간 등을 제거하고 공기의 부상력에 의하여 조류, 부유물질, 냄새 등을 동시에 제거하는 System이다. 현재 상수처리 공정으로서의 생물 산화 여과지 개발을 위해 Bench-scale과 semi-pilot plant를 거쳐 Y시 M취수장애 pilot plant를 설치하여 연구를 진행중에 있으며, 또한, G시 G하수처리장에 하수처리 공정에 관한 연구를 위해 pilot plant를 설치하고 하수 3차 처리와 저농도 하·폐수 처리를 중심으로 연구중에 있다. 아래의 연구 결과는 정수처리 공정 연구를 위한 Bench-scale plant실험을 통해 얻은 결과치이며 현재까지 진행된 연구는 주로 정수처리 공정 중심으로 이루어 졌으나 pilot plant에서는 정수 및 하수처리에서의 생물산화여과공정의 연구가 진행중이다. 현재 연구가 진행중이므로 각 인자별 최적운전조건 등은 계속적인 실험과 연구를 통해 찾아지겠으나 현재까지 수행된 연구자료를 기반으로 볼 때 생물산화 여과장치는 탁도, SS, VSS 등의 제거에 탁월한 효능을 보이고 있다. 수처리용 장치로서의 이러한 기본적인 기능 이외에 NPOC, DOC 제거에도 뛰어난 효능을 보이고 있으며 특히 정수처리 공정에서 문제시 되고 있는 동절기 암모니아성 질소제거 또한 큰 가능성을 보여주고 있다. 그 동안 외국기술에 전면 의존해 오던 생물 산화 여과방식의 국내개발은 비용 절감뿐만 아니라 국내 실정에 맞는 기술개발이라는 점에서 향후 그 적용 범위를 넓혀 갈 수 있을 것이다.

• Journal of Korean Society on Water Environment
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• v.24 no.6
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• pp.758-766
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• 2008

To evaluate homologue patterns and removal efficiency before and after water treatment, the concentrations of dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and coplanar polychlorinated biphenyls (Co-PCBs) were determined in 122 samples from 42 drinking water treatment plants throughout Japan over a two year period. The mean concentrations and toxic equivalent (TEQ) values of dioxins in raw and treated waters were 60.24 pg/L (0.14 pg-WHO-TEQ/L) and 4.15 pg/L (0.016 pg-WHO-TEQ/L), respectively. The dioxins contribution ratio of drinking water in relation to dioxins tolerable daily intake (TDI, 4 pg-TEQ/kg/day) was 0.016%. The mean TEQ removal rate of dioxins by drinking water treatment was over 88%. However, the mean removal rate of 2, 3, 7, 8-TeCDF (tetrachlorodibenzofuran) by water treatment in the 122 samples was minus 17%. Therefore, to identify which process affected the level of 2, 3, 7, 8-TeCDF, the removal efficiencies at both the advanced and conventional water treatment plants were investigated. For the TEQ removal rate across the processes, the dioxin congeners, TeCDF and non-ortho-PCBs remarkably indicated minus values after chlorination in both the advanced and conventional water treatments plant. From this study, the level of 2, 3, 7, 8-TeCDF was found to be increased as a result of chlorination.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.10
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• pp.909-918
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• 2009

As a part of dissolved organic matter, dissolved organic carbon (DOC) or biodegradable DOC (BDOC) fraction in particular is one of important issues in water treatment. Due to role as a nutrient source for bacteria, BDOC, therefore, may cause regrowth problems in water distribution system. The main objectives of this study were to investigate the possibility to minimize the concentration of BDOC in advance water treatment process. DOC in water is fractionized into four fractions such as AnBDOC (adsorbable and non-biodegradable DOC) which possesses adsorption properties but no biodegradation ability; nABDOC (biodegradable and non-adsorbable DOC) which has biodegradation properties but no adsorption ability; ABDOC (adsorbable and biodegradable DOC) which has adsorption properties and biodegradable characteristic; and non-removal DOC (nAnBDOC) which do not have either adsorbability or biodegradability. BAC process was effective for adsorbable DOC (AnBDOC+ABDOC) removal. However, in some cases, the removal ratio of adsorbable DOC was not sufficient. BDOC removal rate is very low or irremovable. Thus, for the control of residual DOC, it is necessary to change the operation condition by BAC process. From the analysis results of DOC fractions, water treatment processes appeared to be effective because it could grasp a remarkable amount of biodegradable, adsorbable and non-removal DOC. The concentration of AOX in non-prechlorination process was reduced from 7.1 ${\mu}g$/L to 0.51 ${\mu}g$/L in BAC process followed by ozonation.

• Journal of the Korea Institute of Building Construction
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• v.16 no.2
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• pp.107-115
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• 2016

In this study, the bond strength of metal spraying system by surface treatment of concrete (waterproof/corrosion method) in water treatment facilities was evaluated. The results showed that the system with Sa-P-R-(S) (sanding-perviousness surface hardener-surface roughness agent-metal spraying-sealing) led to the desirable performance. The bond strength, the coefficient of water permeability and air permeability were 3.7MPa, $0.68{\ast}10^{-8}cm/sec$, and $0.45{\ast}10^{-16}m^2$, respectively. In scanning electron microscope analysis, the microstructure of specimen coated with perviousness surface hardener was much denser than that without it. Therefore, the specimen coated with sanding-perviousness surface hardener-surface roughness agent-metal spraying-sealing had the best bond performance and was the most suitable system to concrete surface in water treatment facilities.

• Journal of Korean Society of Water and Wastewater
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• v.34 no.5
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• pp.323-334
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• 2020

Adsorption by granule activated carbon(GAC) is recognized as an efficient method for the removal of perfluorinated compounds(PFCs) in water, while the poor regeneration and exchange cycles of granule active carbon make it difficult to sustain adsorption capacity for PFCs. In this study, the behavior of PFCs in the effluent of wastewater treatment plant (S), the raw water and the effluents of drinking water treatment plants (M1 and M2) located in Nakdong river waegwan watershed was monitored. Optimal regeneration and exchange cycles was also investigated in drinking water treatment plants and lab-scale adsorption tower for stable PFCs removal. The mean effluent concentration of PFCs was 0.044 0.04 PFHxS g/L, 0.000 0.00 PFOS g/L, 0.037 0.011 PFOA g/L, for S wastewater treatment plant, 0.023 0.073 PFHxS g/L, 0.000 0.00 PFOS g/L, 0.013 0.008 PFOA g/L for M1 drinking water treatment plant and 0.023 0.073 PFHxS g/L, 0.000 0.01 PFOS g/L, 0.011 0.009 PFOA g/L for M2 drinking water treatment plant. The adsorption breakthrough behaviors of PFCs in GAC of drinking water treatment plant and lab-scale adsorption tower indicated that reactivating carbon 3 times per year suggested to achieve and maintain good removal of PFASs. Considering the results of mass balance, the adsorption amount of PFCs was improved by using GAC with high-specific surface area (2,500㎡/g), so that the regeneration cycle might be increased from 4 months to 10 months even if powdered activated carbon(PAC) could be alternatives. This study provides useful insights into the removal of PFCs in drinking water treatment plant.