• 한국환경보건학회지
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• 제35권6호
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• pp.517-525
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• 2009

The water quality of Lake Shihwa had been rapidly deteriorating since 1994 due to wastewater input from the watersheds, limited water circulation and the lack of a wastewater treatment policy. In 2000, the government decided to open the tidal embankment and make a comprehensive management plan to improve the water quality, especially inflowing stream water around Shihwa and Banwol industrial complex. However, the water quality and microbial community have not as yet been fully evaluated. The purpose of this study is to investigate the influent water quality around the industrial area based on chemical and biological analysis, and collected surface water sample from the Siheung Stream, up-stream to down-stream through the industrial complex, Samples were collected in July 2009. The results show that the downstream site near the industrial complex had higher concentrations of heavy metals (Cu, Mn, Fe, Mg, and Zn) and organic matter than upstream sites. A combination of DGGE (Denaturing Gradient Gel Electrophoresis) gels, lists of K-WQI (Korean Water Quality Index), cluster analysis, MDS (Multi-Dimensional Scaling) and PCA (Principal Component Analysis) has demonstrated clear clustering between Siheung stream 3 and 4 and with a high similarity and detected metal reducing bacteria (Shewanella spp.) and biodegrading bacteria (Acinetobacter spp.). These results suggest that use of both chemical and microbiological marker would be useful to fully evaluate the water quality.

• 산업공학
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• 제17권1호
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• pp.104-112
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• 2004

The purposes of the study were twofold: to investigate the stereotype of position and direction that the users expect when operating the handles of a water faucet in different directions, and to collect information about user’s preferred directions. Six hundred subjects, aged from teens to over sixties, participated in the experiment with the procedure of showing them actual water faucets of a lever-type handle and two round-shaped handles mounted on the sink(horizontal plane) and wall(vertical plane). The water faucets presented to the subjects were most widely used devices in our living environment. The results showed that when the handle of the lever-type water faucet was in the 'up' position, 63% of the subjects expected the device was 'open'. When the cold hot separated water faucets were mounted on the horizontal or vertical plane, over 50% of those who answered the 'open' direction of round type handles responded as 'counter clockwise' for a 'hot' water faucet and 'clockwise' for a 'cold' water faucet. In conclusion, this study suggests that water faucet devices be designed and installed in the way that the users expect them to operate.

• 상하수도학회지
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• 제28권3호
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• pp.339-344
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• 2014

The predictive capacity of wastewater treatment facility in the industrial park was estimated by the traditional method and on-the-spot survey such as certification of wastewater report and the invoices of water supply and ground water supply. The ratios of a converted wastewater to supplied industrial water between traditional method and on-the-spot survey in the estimation methods were different. By using traditional method, the business type of clothes, accessary and fur production had 77.18 % of waste ratio of wastewater and $10.72m^3/day{\cdot}1000m^2$ unit mass of wastewater as the highest among 9 business types. With the respect to the on-the-spot survey, food manufacturing business type had 75 % of waste ratio of wastewater and $8.35m^3/day{\cdot}1000m^2$ unit mass of wastewater as the highest values. The amount of wastewater from on-the-spot survey method was 541 $m^3/day$ less than one from traditional method.

• 한국막학회:학술대회논문집
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• 한국막학회 1998년도 춘계 총회 및 학술발표회
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• pp.89-92
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• 1998

1. Introduction : Among many azeotropic compounds, pyridine which forms an azeotropic mixture with three moles of water boiling at 92-93$\circ$C is very useful synthetic intermediate in laboratory and industry. With conventional separation method, the dehydration of pyridine aqueous solution is difficult and requires strong drying chemicals. To overcome these difficulties, several researchers have investigated on the separation of pyridine from aqueous solution through polymer membranes. Kujawski reported several ion-exchang membranes containing carboxylic and sulfonic fuctional group for dehydration of aqueous pyridine solution [1]. We have applied the idea of activation of water tranport through ion-dipole interactions between polymer membrane and aclueous feed. Our previous studies reported on the in-situ complex membrane to separate water from aqueous pyridine solution based on simple acid'-base theory [2, 3]. Water transport was enhanced through in-situ complex formation between the , acid moiety in the membrane and the incoming pyridine moiety in the feed.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2008년도 학술발표회 논문집
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• pp.1570-1576
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• 2008

산업단지나 아파트 단지 내에 수로나 연못을 이용한 친수공간의 시설이 일반화 되어가고 있다. 단지내 친수공간의 계획에서는 시설의 종류, 배치, 수원, 수질 물 순환계획 등을 검토하여야 한다. 본 연구에서는 지방산업단지 내에 친수공간을 계획하는데 몇 가지 대안을 설정하고 이러한 검토항목에 대하여 비교 검토하여 가장 합리적인 대안을 선정하였다. 본 단지 내의 친수시설은 단지의 중앙부를 가로지르는 수로를 기본으로 하여 공원과 분수연못을 배치하는 것으로 하였다. 수원은 단지 옆을 흐르는 강, 단지 상류의 저수지, 단지 내 지하수 및 상수도를 고려할 수 있으며, 각각에 대하여 수량, 수질, 물 순환 방식, 인허가, 유지관리 등을 비교하였다. 친수시설은 돌과 자갈 등의 자연재료를 이용하여야 한다. 사람이 유량감을 느끼기 위하여 수로내의 평균수심은 10 cm, 평균유속은 0.15 m/s 정도로 한다. 여러 대안의 비교 검토한 결과, 강과 저수지는 사용허가와 수질관리가 어렵고 상수도는 물값이 비싸기 때문에 지하수를 사용하고, 상하류부에 저수조를 설치하고 펌프로 순환시키는 시스템이 가장 적합한 것으로 조사되었다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2003년도 학술발표논문집
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• pp.495-498
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• 2003

In order to analyze water supply capacity in estuary barrage dam, a system was developed in which base model was consisted of daily water balance model and daily inflow model. Agricultural water demand to paddy fields and domestic and industrial water demand were considered in this daily water balance model. Also outflow volume through sluice gate and inside water level at time to start outflow was conditioned initially to simulate reservoir storage. The DAWAST model was selected to simulate daily reservoir inflow in which return flows from agricultural, domestic and industrial water were included to simulate runoff. Using this developed system, water supply capacity in the Keum river estuary reservoir was analyzed.

• 산업기술연구
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• 제27권B호
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• pp.3-7
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• 2007

Ultraviolet light(UV-C, wavelength: 200~280nm) is employed profitably for sterilizing drinking water. For most water serving apparatus such as a water purifier, a water cooler and heater, a coffee vending machine and etc., pre-sterilized water may be contaminated secondarily with bacillary inhabitation in a container before serving. In consideration of this problem, a household water tap which is equipped with a sterilization/Purification device in combination with non-contact UV-lamp, was designed to sterilize and purify water at the last outlet just before serving. Hopefully this simple but creative item may be commercialized for household and public use.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.537-541
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• 2001

For the development of reformation material of soft ground using the LD slag, the relation to the particle condition of LD slag and the pH behavior of slag dissolution water, extraction properties of slag, and origination of white water were investigated. When the LD slag is mixed with sea water, the pH of solution ranged between 9.47 and 10.0. On the other hand, when mixed with distilled water, the pH was about 10.4 to 12.1. For the as-received slag and the aged slag in sea water, a pH of 11.5 to 12.0 was observed when the particle size was less than 0.5mm. For the reoxidized slag in seawater, the pH of the solution was lower than 9.5 when the particle size was bigger than 0.075mm. For the aged slag and reoxidized slag, the pH of the solution remained constant when the addition ratio of sea water to the slag was higher than 500 times. The main elements dissolved from the slag were Ca and Mg ions. When the pH went over 9.0, the white water started to font which was caused by the CaCO$_3$and Mg(OH)$_2$.

• 공업화학
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• 제4권1호
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• pp.125-131
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• 1993

두 종류의 변성 셀룰로오즈 막내의 물의 상태를 시차열분석계를 이용하여 분석하였다. 셀룰로오즈막들은 카르복시메틸 셀룰로오즈(CMC)-젤라틴 고분자전해질 복합체막과 아크릴산 가교 메틸셀룰로오즈(MC)전해질막이다. 동결수(자유수)와 비동결수(결합수) 양을 측정하여서 막을 통한 용질들의 투과도와의 관계를 조사하였다. 막내의 물의 상태는 막의 조성, 모폴로지, 그리고 수화도의 영향을 받는 것을 알았다. 수화된 막들을 통한 확산 투과도의 차이를 자유수와 결합수의 차이로 설명하였다.

• 멤브레인
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• 제12권3호
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• pp.151-157
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• 2002

본 연구는 하수를 공업용수로 재이용하기 위한 분리막 시스템 적용에 관한 연구이다. 정밀여과와 역삼투시스템으로 구성된 bench scale 실험장치를 이용하여 하수처리장 현장에서 실험을 수행한 결과, 정밀여과 시스템은 이온성분은 제거할 수 없었으나 SS를 70% 이상 처리할 수 있어 처리수는 직접냉각수로 재이용이 가능하였다. 그리고 역삼투 시스템은 SS는 물론 이온성분도 95% 이상 제거할 수 있어 처리수는 간접냉각수 및 제품세척수로 사용이 가능하였다. $100 m^3$/일 용량의 pilot Plant를 제작하기 위해서는 정밀여과 모듈은 20개, 역삼투 모듈은 12개가 필요하였다.