• 한국농공학회지
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• 제44권5호
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• pp.96-105
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• 2002

As an useful water purification system for non-point source pollution in rural watersheds, interests in constructed wetlands are growing at home and abroad. It is well known that constructed wetlands are easily installed, no special managemental needs, and more flexible at fluctuating influent loads. They have a capacity for purification against nutrient materials such as phosphorus and nitrogen causing eutrophication of lentic water bodies. The Constructed Wetland Design Model (CWDM), developed through this study is consisted mainly of Database System, Runoff-discharge Prediction Submodel, Water Quality Prediction Submodel, and Area Assessment Submodel. The Database System includes data of watershed, discharge, water quality, pollution source, and design factors for the constructed wetland. It supplies data when predicting water quality and calculating the required areas of constructed wetlands. For the assessment of design flow, the GWLF (Generalized Watershed Loading Function) is used, and for water quality prediction in streams estimating influent pollutant load, Water Quality Prediction Submodel, that is a submodel of DSS-WQMRA model developed by previous works is amended. The calculation of the required areas of constructed wetlands is achieved using effluent target concentrations and area calculation equations that developed from the monitoring results in the United States. The CWDM is applied to Bokha watershed to appraise its application by assessing design flow and predicting water quality. Its application is performed through two calculations: one is to achieve each target effluent concentrations of BOD, SS, T-N and T-P, the other is to achieve overall target effluent concentrations. To prove the validity of the model, a comparison of unit removal rates between the calculated one from this study and the monitoring result from existing wetlands in Korea, Japan and United States was made. As a result, the CWDM could be very useful design tool for the constructed wetland in rural watersheds and for the non-point source pollution management.

• 상하수도학회지
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• 제31권5호
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• pp.421-430
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• 2017

In this study, a model was developed to predict for Disinfection By-Products (DBPs) generated in water supply networks and consumer premises, before and after the introduction of advanced water purification facilities. Based on two-way ANOVA, which was carried out to statistically verify the water quality difference in the water supply network according to introduce the advanced water treatment process. The water quality before and after advanced water purification was shown to have a statistically significant difference. A multiple regression model was developed to predict the concentration of DBPs in consumer premises before and after the introduction of advanced water purification facilities. The prediction model developed for the concentration of DBPs accurately simulated the actual measurements, as its coefficients of correlation with the actual measurements were all 0.88 or higher. In addition, the prediction for the period not used in the model development to verify the developed model also showed coefficients of correlation with the actual measurements of 0.96 or higher. As the prediction model developed in this study has an advantage in that the variables that compose the model are relatively simple when compared with those of models developed in previous studies, it is considered highly usable for further study and field application. The methodology proposed in this study and the study findings can be used to meet the level of consumer requirement related to DBPs and to analyze and set the service level when establishing a master plan for development of water supply, and a water supply facility asset management plan.

• 상하수도학회지
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• 제33권4호
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• pp.311-319
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• 2019

The purpose of this study was to analyze water treatment characteristics, including the efficiency of removing algae from water purification plants, by installing a demonstration facility for decontamination of algae, including natural algae remover injection equipment, in the water purification plant. Jar-test showed that the optimum injection of natural decontaminant was 20 mg/L. Of the water contaminant treatment efficiency of the intake and water purification plants, Chl-a averaged 74.0% elimination efficiency from $5.0mg/m^3$ to $1.3mg/m^3$ and the maximum treatment efficiency was 91.5% removal efficiency when the inflow concentration of Chl-a was $11.8mg/m^3$. In addition, 51.2% and 47.1% of the taste and odor indicator items, geosmin and 2-MIB, resulted from the overgrowth and decaying of algae, respectively, to identify toxic substances and odor reduction effects. In addition, elimination efficiencies of SS and Turbidity materials were higher than 70.0%. In the injection of natural algae remover, no effects such as sudden changes in water quality due to secondary reactions were found, and appropriate levels were maintained under water treatment conditions.

• 한국물환경학회지
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• 제40권2호
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• pp.89-100
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• 2024

Climate change has a broad impact on the entire water environment, and this impact is growing. Climate adaptation in water supply systems often involves quantity and quality control, but there has been a lack of research examining the impacts of climatic factors on water supply productivity and operation conditions. Therefore, the present study focused on, first, building a database of climatic factors and water purification operating conditions, and then identifying the correlations between factors to reveal their impacts. News big data was analyzed with keywords of climatic factors and water supply systems in either nationwide or region-wide analyses. Metropolitan area exhibited more issues with cold waves whereas there were more issues with drought in the Southern Chungcheong area. A survey was conducted to seek experts' opinions on the climatic impacts leading to these effects. Pre-chlorination due to drought, high-turbidity of intake water due to rainfall, an increase of toxins in intake water due to heat waves, and low water temperature due to cold waves were expected. Pearson correlation analysis was conducted based on meteorological data and the operating data of a water purification plant. Heavy rain resulted in 13 days of high turbidity, and the subsequent low turbidity conditions required 3 days of high coagulant dosage. This insight is expected to help inform the design of operation manuals for waterworks in response to climate change.

• 한국농공학회논문집
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• 제51권5호
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• pp.95-100
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• 2009

The water purification systems have been hardly used for agricultural purpose due to their complicated compositions and high costs for farmers, while only simple filtrations have been applied to irrigation systems in order to prevent the system from clogging problems. This study therefore developed a clean water supplying system, the Filter-Disinfection-Adsorption (FDA) system, especially for greenhouse cultivation of where low quality of water is available. This system has also been produced for providing convenience water to farmers in the areas of no water supply service systems for the purpose of washing their bodies or agricultural machineries after farm work. The FDA system consists of three stages of purification processes with an integral module, including disk and teflon filtrations and Ultraviolet (UV) sterilization processes. Indoor experiments were undertaken with a trial product of the FDA system to test its performance. The operation test of the process was performed as well as the condition check of each item including UV module, filters, control panel, pump, valves, etc. The results shows good performance of each test with no critical problems. The initial and maintenance costs were also analysed with other purification systems. From the comparisons, the FDA system found to be very economical and easy to use.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 추계학술대회
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• pp.43-46
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• 2022

수용가에서 사용되는 수돗물의 패턴과 양을 정확하게 예측하여 필요한 만큼의 수돗물을 펌프를 이용하여 배수지로 전달하여 저장하고, 필요한 유량이 최소의 전기에너지를 이용하여 적기에 공급되어야 정수장의 최적화 운영을 할 수 있다. 본 논문에서는 수돗물 생산·공급의 안정성을 확보하기 위하여 AI 기반 복합센서를 실증지인 정수장에 적용하기 전에 사전검증할 수 있는 시스템을 구축하여 복합센서별 사전검증 모델을 통해 보완 사항을 도출하고, 제작 과정에 피드백하여 복합 센서 데이터의 품질 및 동작 안정성을 향상시키고자 하였다.

• 환경영향평가
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• 제28권5호
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• pp.471-482
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• 2019

본 연구에서는 유기성 오염도가 높은 국내 하천 및 호소의 수질정화를 위해 바이오스톤 볼 담체를 이용한 수처리 기술을 개발하였다. 바이오스톤 볼 수처리기술의 오염물질 제거효율 및 저수지 수질개선효과 등을 평가하기 위하여 경기도 시흥시에 위치한 매화저수지에 실증플랜트를 설치하였다. 바이오스톤 볼 수처리시스템의 오염물질 제거효율은 BOD 70.3%(47.2~97.4%), COD 45.3%(26.1~64.7%), TOC 19.2%(8.5~50.0%), SS 82.8%(73.1~92.7%), Chl-a 80.4%(57.2~91.8%), TN 23.2%(6.4~39.5%), TP 51.8%(-1.1~80.1%)로 나타나 BOD, SS, Chl-a에서 평균 70~80% 이상의 매우 높은 정화효율을 나타내었다. 바이오스톤 볼 수처리시스템을 저수지 평시 유입량 설계기준으로 설치하였을 경우의 유입 오염물질 저감량 및 저수지 수질개선효과를 산정하였다. 저감되는 COD 부하량은 13,658 kg으로 연간 39.2%가 저감되고, TP 부하량은 297 kg으로 연간 16.8%가 저감되는 것으로 나타났다. 저수지의 연간 수질개선효과는 TOC $5.3{\rightarrow}4.5mg/L$(14.5%), COD $7.9{\rightarrow}6.8mg/L$(14.5%), Chl-a $42.3{\rightarrow}37.0mg/m^3$(12.5%), T-P $0.201{\rightarrow}0.150mg/L$(25.1%)가 평균적으로 개선되는 것으로 나타났다. 바이오스톤 볼 수처리시스템은 유기성 오염도가 높은 국내 하천 및 호소의 유입수 오염물질 제거 및 수질정화를 위한 수처리 시설로서 현장적용성이 높을 것으로 판단된다.

• 대한안전경영과학회지
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• 제4권3호
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• pp.177-187
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• 2002

The contamination problem is getting worse now a day because of the industrial activities. Recently it has been announced that there's environmental hormone in river and lake which produces clean water, also there's too many of algae reproduces under the water and some virus in the drinking water. The quality of water is very important. pure and clean water is not only a precondition for human being to live but a basic factor to improve the quality of life. so a water purification system must be developed. This study is about the surface washing treatment technique. We tried to use a rotary nozzle to get a tush degree of efficiency, for it was not enough with present way of washing. The nozzle is run by water pressure. The results of the experiment are as follows. We got a clean and equal surface after washing. After washing, the water's maximum consistency was 330NTU and it shows that this way is better than before one with 215NTU. Clean level of the filter was 6$^{\circ}$and it's 2.8 times higher than 17$^{\circ}$with the old way. We can see the results that the new way of washing is more effective than old way based on this study.

• 상하수도학회지
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• 제32권6호
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• pp.487-497
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• 2018

Water quality improvement processes for stagnant area consist mainly of technologies applying vegetation and artificial water circulation, and these existing technologies have some limits to handle pollution loads effectively. To improve the purification efficiency, eco-friendly technologies should be developed that can reinforce self-purification functions. In this study, a multi-functional floating island combined with physical chemical biological functions ((1) flotation and oxidization using microbubbles, (2) vegetation purification and (3) bio-filtration with improved adsorption capacity) has been developed and basic experiments were performed to determine the optimal combination conditions for each unit process. It has been shown that it is desirable to operate the microbubble unit process under conditions greater than $3.5kgf/cm^2$. In vegetation purification unit process, Yellow Iris (Iris pseudacorus) was suggested to be suitable considering water quality, landscape improvement and maintenance. When granular red-mud was applied to the bio-filtration unit process, it was found that T-P removal efficiency was good and its value was also stable for various linear velocity conditions. The appropriate thickness of filter media was suggested between 30 and 45 cm. In this study, the optimal design and operating parameters of the multi-functional floating island have been presented based on the results of the basic experiments of each unit process.

• 한국산학기술학회논문지
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• 제21권12호
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• pp.510-523
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• 2020

본 연구에서는 시설원예 농가 중 지하수 수질에 문제가 있는 농가와 지하수를 원활히 사용하는 농가의 수질 성분을 분석하고 비교하였다. 이를 통해, 국내 수경재배 시설을 대상으로 지하수 수질에 따라 양액 재배용 원수로 사용 가능성을 평가하였다. 지하수 수질에 문제가 없는 농가의 지하수는 평균적으로 pH 6.61, EC 0.27 dS/m, NO3-N 7.64 mg/L, NH4+-N 0.80 mg/L, PO4-P 0.09 mg/L, K+ 6.26 mg/L, Ca2+ 18.57 mg/L, Mg2+ 4.38 mg/L, Na+ 20.85 mg/L, Cl- 18.10 mg/L, S2- 7.97 mg/L, HCO3- 55.06 mg/L, Fe 0.09 mg/L, Mn 0.01 mg/L, Zn 0.04 mg/L, Cu 0.01 mg/L, B 0.04 mg/L, Si4+ 8.93 mg/L, Mo 0.01 mg/L로 나타났으며, 모두 양액 재배용 원수의 수질기준을 만족하였다. 반면, 지하수 수질에 문제가 있는 농가의 경우 대다수의 항목이 양액재배용 원수의 수질기준을 초과하였다. 이러한 성분분석 결과로 보아 작물재배에 적합하지 않은 수질의 지하수를 정수하여 원수로 사용하는 것은 지하수의 재충전, 토양정화 측면에서 효과가 있다고 판단된다. 본 연구결과를 바탕으로 농업용 정수시스템을 구성한다면 우선처리 대상 항목 및 연계 항목을 추측할 수 있어 설계가 용이할 것으로 판단된다. 또한 이러한 농업용 정수시스템을 정착시킨다면 시설원예 단지에서 직접 지하수를 사용하면서 재충전 및 재이용할 수 있고, 결과적으로 지속가능한 농업과 국토 정화에 이바지 할 수 있는 기본 정보를 제공한다.