• Membrane Journal
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• v.18 no.2
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• pp.157-167
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• 2008

Removal of organic substances and taste/odor control are ones of the main issues in water supply, resulting in introduction of advanced processes such as ozon/GAC, or PAC. However, raw water quality deteriorates, new pollutants advent, so water quality is not acceptable enough even with those existing advanced processes. In this paper, a new advanced water treatment process using PAC slurry blanket, where PAC particles stay in the basin as slurry blanket, coupled with submerged membranes is introduced. A pilot plant $(80m^3/day)$ was installed to assess the performance of this new process using actual raw water, and DOC was removed higher than 90% in the beginning and $70{\sim}80%$ afterwards, while 2-MIB and geosmin were removed completely. This new process still requires future study on process optimization and long-term assessment, however it seems highly possible to countermeasure as a new advanced process with high removal efficiency.

• Journal of Korean Society of Environmental Engineers
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• v.27 no.6
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• pp.567-572
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• 2005

In this study, a lab-scale test was performed to apply the ozone process in drinking water treatment plant using dissolved ai, flotation(DAF). The kinetic study on the ozone decay and hydroxyl(OH) radical formation was investigated by several parameters, such as I.D(Instantaneous ozone demand), $k_c$(ozone decomposition rate), ozone-Ct and OH radical-Ct. Ozonation of several target waters, such as raw water, DAF treated water and filtrate, was conducted to select the optimum position and dosage of ozone process. The highest value of Ozone-Ct and OH radical-Ct was observed at DAF treated water at initial run time($0{\sim}30\;min$). From the results of ozonation, the intermediate ozonation was proposed as the optimum position and the effective dose of ozone was determined to be $1{\sim}2\;mg/L$.

• Applied Chemistry for Engineering
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• v.28 no.4
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• pp.410-419
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• 2017

Since the beginning of the water shortage by disasters such as global warming, environmental pollution, and drought, development of original technology and studies have been undergone to increase availability of water resources. Among them the water treatment separation membrane technology is an environmentally friendly process that does not use chemicals and shows better water quality improvement effect than conventional physicochemical and biological processes. The water treatment membrane can be applied to various fields such as waste water treatment, water purification treatment, seawater desalination, ion exchange process, ultrapure water production, organic solvent separation and water treatment technology, and it tends to expand the range of application. In the core technology of water treatment membrane, researches are being actively carried out to develop a separation membrane of better performance by controlling the pore size to adjust the separation performance. In this review, we summarized the frequency of announcement by country and organization through the technological competitiveness evaluation of patents and papers of the water separation membrane. Also, we evaluated the results from membrane research for waste water treatment, water purification treatment, seawater desalination, ion exchange process and present the future direction of research.

• 한국상하수도협회지
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• s.5
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• pp.62-65
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• 2004

• 한국상하수도협회지
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• s.5
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• pp.66-75
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• 2004

• Proceedings of the Membrane Society of Korea Conference
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• 1998.04a
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• pp.76-78
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• 1998

1. 서론 : 수처리공정에서의 막오염은 효과적인 공정운용을 위해 주요 문제로 인식되고 있으며 막오염은 막표면이나 세공에서 물질의 흡착, 부착 그리고 축적 등과 같은 일련의 메카니즘에 의해 투과율을 저하시키는 결과를 초래한다. 본 연구는 주기적인 역세척(frequency backpulsing)에 의한 중공사막에서의 오염 현상을 규명하여 정수 처리 공정에서 막오염을 최소화시키는 운전 조건을 확립하는 것을 목적으로 하고 있다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1747-1748
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• 2008

정수처리시스템에서의 염소소독공정은 염소투입설비의 지연요소와 염소반응시간에 의한 지연요소 등으로 매우 큰 시지연특성을 갖는 대표적인 공정이다. 본 논문에서는 염소소독공정 중 후염소공정을 조사 분석하여 공정에 영향이 큰 파라메타를 선정하고 이를 통하여 각 파라메타간 상관관계를 분석함으로써, 시지연공정의 모델을 개발하였다.

• Journal of Wetlands Research
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• v.17 no.2
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• pp.155-162
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• 2015

This study was conducted to assess the removal characteristics of taste and odor causing compounds(2-MIB and geosmin) and micro organic matters. GAC and BAC process consisting of Ozone/AOP and activated carbon was applied. As a result, the influent concentration of 2-MIB 159 ng/L and geosmin 371 ng/L were removed 42% and 86% by ozone 1.0 mg/L, and 58%, 90% by AOP(ozone 1.0 mg/L + $H_2O_2$ 0.5 mg/L). Also it showed less than 2 ng/L effluent in GAC process and 99.8% removal efficiency in BAC process. Therefore, BAC process combining ozone/AOP and GAC is effective for persistent removal of micro organic matters, taste and odor. It is needed for optimization of Ozone/AOP process according to influent concentrations.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.1-1
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• 2017

녹조현상은 부영양화된 호수나 유속이 느린 하천에서 부유성의 조류(식물 플랑크톤)가 대량 증식하여 수면에 집적하게 되고 물의 색을 현저하게 녹색으로 변화시킴으로써 발생된다. 최근에는 이러한 녹조 현상이 광역화, 독성화, 장기화의 특성을 띠며 빈번히 발생되고 있다. 녹조현상은 독소를 발생시키는 남조류에 의해 수생식물에 악영향을 주는 것으로 알려져 있다. 예를 들면 독소에 의한 가축에의 영향, 생태계 파괴로 인한 생태학적인 문제, 산소결핍으로 인한 물고기 및 각종 수중생물 폐사 등의 심각한 문제를 야기한다. 또한 조류는 식수에서 맛과 냄새를 유발할 뿐 아니라 Microcystin-LR과 같은 유해한 독소를 배출하여 공중 보건을 위협한다. 이에 식수원으로 사용되는 하천의 조류 번식에 따른 대응방안 마련이 절실히 요구된다. 유입되는 조류로 부터의 정수처리 설비의 처리 부하를 줄이기 위해서는 취수시스템과 연계한 고속 전처리 조류 제거 시스템을 개발이 필요하다. 기존의 전기응집부상공정(Electro-Coagulation and Flotation, ECF)은 화학 약품(응집제) 투여량이 적은 이점이 있지만 비교적 긴 전기 분해 시간이 필요하여 기존 정수처리 시스템과 연계성에 있어 한계가 있다. 이에 본 연구는 전기 분해 시간을 줄여 유입된 조류를 수 초 내에 응집하여 1분 이내에 조류를 분리하는 초고속 조류 전처리 기술을 개발하였다. 개발된 기술의 현장적용 및 실험 결과, 응집과정이 없이도 Chlo-a는 약 45 %의 제거 효율을 나타났다. 또한 응집제의 투입 및 전극에 의한 부상시스템에 의해 Chlo-a가 약 80 %로 제거되는 것으로 나타나 빈번하게 발생되는 조류로부터 안정적인 물 공급을 위한 전처리 공정으로 활용이 가능할 것으로 판단된다.

• Journal of Korean Society of Environmental Engineers
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• v.27 no.1
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• pp.11-16
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• 2005

Humic substances(HS) from raw and process waters at a conventional water treatment plant were isolated and extracted by physicochemical fractionation methods to investigate their characteristics. They are characterized for their functionality, chemical composition, and spectroscopic characteristics using FT-IR(Fourier transform infrared) and $^1H-NMR$(proton nuclear magnetic resonance) spectroscopy. Humic fraction gradually decreased from 47.2% to 26.4%(from 0.97 to 0.54 mgC/L) through conventional water treatment processes. Concentration of phenolic groups in the HS fraction gradually decreased from 60.5% to 21.8%(from 12.2 to $6.0\;{\mu}M/L$ as phenolic-OH) through water treatment. In the case of carboxylic groups, the concentration increased from 39.5% to 46.9%(from 7.9 to $10.6\;{\mu}M/L$ as COOH) by pre-chlorination, but gradually decreased to 34.2%($9.4\;{\mu}M/L$ as COOH) through sedimentation and sand filtration. From the results of the FT-IR and $^1H-NMR$ spectra of HS, the content of carboxylic groups increased and ratio of aliphatic protons to aromatic protons($P_{Al}/P_{Ar}$) also increased through water treatment, which indicated the increase of aliphatic compounds.