• 상하수도학회지
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• 제29권2호
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• pp.155-163
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• 2015

Many advanced treatment processes have been introduced to WTPs, however, the consumer confidence on tap water is still low and the percentage of drinking water directly from the tap is less than 2 %. One of the methods to improve the credibility of tap water is to introduce a drinking water certification system. By introducing the system, water treatment processes can be optimized, which in turn, can significantly improve drinking water quality. In this paper, 6 water quality parameters(i.e., turbidity, CT, residual chlorine, geosmin, 2-MIB, Mn) which have significant influences on tap water quality and consumer confidence were identified, and their recommended guidelines were proposed. 3-Star or 5-Star certification can be awarded to the WTPs which have met the certification criteria. The drinking water certification system can be carried out as a voluntary program among drinking water suppliers.

• 한국물환경학회지
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• 제33권3호
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• pp.359-369
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• 2017

Water distribution systems supply drinking water to consumers' taps. Internal corrosion of metallic pipe used in drinking water distribution systems has reduced water quality and led to increased levels of toxic heavy metals such as lead, copper and nickel. These problems have been experienced to varying degrees by water utilities in many countries. North America has successfully managed and controlled pipe corrosion and corrosive water in water distribution system based on various policies, regulations and rules. Practical and engineering guidelines for evaluation of pipe corrosion and determination of treatment options are also provided to assist drinking water supplies. In addition, the corrosion mechanism in water distribution systems, such as the complex effects of physical and chemical parameters on the corrosion pipes has been improved to accurately predict corrosion rates of metallic pipes in actual water distribution systems. This paper reviews various regulations, policy statement, and treatment produces on controlling corrosion in drinking water distribution systems in US and Canada and then offers suggestion for management of corrosive water and pipe corrosion in drinking water distribution system in Korea.

• 한국지하수토양환경학회지:지하수토양환경
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• 제15권6호
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• pp.99-106
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• 2010

We investigated springs in Seoul in 2009 to know the change of water quality according to storage method of spring water, the concentration of chemical compounds and their correlation. Even spring water that originally satisfied national standard for drinking water could be exceeded national standard for drinking water by storage method such as storage bottle, temperature and period; especially used PET bottles could affect the increase of total colony counts. Therefore, spring water is desirable to be consumed on the spot, or to be stored in sterilized bottles in refrigerator rather than room temperature at home, and also to be consumed shortly not exceeding 24 hours. Total colony counts, coliform, yersinia, $F^-$, $Cl^-$, $NO_3^--N$, hardness, total Solids, pH, color and Al were exceeded national standard for drinking water at some springs. The result of correlation analysis shows that hardness and total solids, which are caused by several ionic compounds, had relatively high correlations with other chemical compounds.

• Toxicological Research
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• 제18권2호
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• pp.107-116
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• 2002

Arsenic (As) is a ubiquitous element found in several forms in foods and water. Although certain foods, such as marine fish, contain substantial levels of organic arsenic forms, they are relatively low in toxicity compared to inorganic forms. in contrast, arsenic in drinking water is predominantly inorganic and highly toxic. Chronic ingestion of arsenic-contaminated drinking water is therefore the major pathway posing potential risk to human hearth. since the early 1990s in Bangladesh ozone, arsenic exposure has caused more than 7,000 deaths and uncounted thousands shout symptoms of long-term arsenic poisoning. Significant portion of world populations are exposed to low to moderate levels of arsenic of parts per billion (ppb) to hundreds of ppb. As a consequence, the World Health Organization (WHO) and U.S. environmental health agencies, such as the Environmental Protection Agency (EPA) made arsenic their highest priority. Recently, the WHO, European Union (EU), and US. EPA lowered an acceptable level of 10 ppb for arsenic in drinking water In this article, various health effects of arsenic in drinking water were reviewed and the current status for risk assessment to regulate arsenic in drinking water was discussed.

• 한국가금학회지
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• 제21권2호
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• pp.119-131
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• 1994

The physiological functions of drinking water in chicken were reviewed. The effects of ambient temperature, humidity, wind velocity, egg productivity, feed form, nutrients density, and breed types on the water consumption of chicken were summarized and discussed. Some guidelines for management of drinking water in commercial poultry farms were also suggested.

• 한국식품위생안전성학회지
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• 제22권3호
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• pp.159-164
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• 2007

대구근교 외식업체 25곳의 고객에게 제공되고 있는 음용수의 위생실태를 조사한 결과 약 60%가 총균수의 허용한도는 100 CFU/mL를 초과하였으며, 외식업체를 경영하는 CEO 50명을 대상으로 음용수에 관한 설문조사를 한 결과 음용수에 대한 위생의식은 매우 부족하였다. 보리차, 결명차, 옥수수, 메밀, 둥굴레, 캐모마일, 현미녹차, 페파민트를 사용하여 제조한 음용수의 색, 맛, 향, 종합적기호도는 생수에 비해 전반적으로 기호성이 증가하였으며, 종합적 기호도는 둥굴레차가 가장 좋았으며, 옥수수차, 결명자 차, 보리차 순으로 양호하였다. 시판 현미녹차, 둥굴레차, 보리차, 결명차, 옥수수차를 이용하여 음용수를 제조하여 플라스틱 물병에 분주하여 $10^{\circ}C$와 $25^{\circ}C$에 저장하면서 총균수의 변화를 검토한 결과 $10^{\circ}C$에서 대조구는 저장 4일 이후 $10^2 CFU/mL$이상을 나타내어 음용수로서 부적절하였으며, 현미녹차, 둥굴레차, 결명차, 옥수수차는 저장기간 동안 미생물의 증가 현상이 거의 나타나지 않았다. $25^{\circ}C$에 저장한 경우 대조구는 저장 2일 이후 $10^2 CFU/mL$이상을 나타내었으며. 옥수수차, 둥굴레차, 보리차, 결명차에서 오히려 미생물의 성장이 촉진되는 현상을 나타내었으나, 현미녹차의 경우 전 저장기간 동안 생균수의 증가현상은 나타나지 않았다.

• 과학교육연구지
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• 제32권1호
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• pp.73-84
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• 2008

이 연구의 목적은 구미 지역 주부들의 먹는 물과 물 환경에 대한 인식을 조사하여, 주부들의 먹는 물로서의 수돗물과 수돗물 오염에 대한 생각들을 알아보고자 하였다. 연구 대상은 구미 지역 주부 20명을 대상으로 먹는 물과 물 환경에 대한 질문지를 작성하게 하여 그 결과를 분석하였다. 연구 결과로 첫째, 대상자들은 구미 지역에 영향을 미치는 자연 자원으로서의 먹는 물과 물 환경에 대한 관심이 높았다. 또한 대상자의 35%는 정수기로 정수된 물을 마시고, 30%는 수돗물을 끓여서 마시고 있는 것으로 조사되었다. 수돗물의 안전성에 대해서는 75%였으나, 먹는 물의 안전성은 상대적으로 낮게 인식하고 있었다. 둘째, 주부들은 먹는 물 보전 캠페인과 능동적인 참여가 지역 사회와 연계할 때 더욱 효과적이라고 주장하였다. 더욱이 먹는 물과 물 환경에 대한 지속적인 교육을 통해 먹는 물로서의 수돗물에 대한 인식이 촉진될 수 있다고 하였다.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2003년도 International Symposium on Clean Environment
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• pp.151-154
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• 2003

With estmating drinking water demands of Ulsan city, the amount would be increased from 523,000ton/day in 2006 to 635,000 ton/day in 2016. Also, the dependence of Nakdong River on the Ulsan city as a source of drinking water will be very high up to 54.4％ of total drinking water demands. Small-scale drinking water dam is no economical because of excessive construction cost and long construction period. However, development of riverbed and ground water of existing rivers is more economical than that of small-scale drinking water dam. In this study, to utilized Dongchun River as a drinking water resource, Modflow model was used to predict the amount of riverbed and ground water of Dongchun River basin. As a result, available amount of riverbed water was assumed in 6,000 ton/day by worst case (when perfect dry stream) and in case of ground water, it was assumed in 17,800 ton/day.

• Asian-Australasian Journal of Animal Sciences
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• 제1권3호
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• pp.157-161
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• 1988

To study the effect of moisture content of the diet on drinking behaviour and the amount of water drunk, observations were made on 8 Holstein steers fed either fresh cut forage or first cut hay. The observations were made in a barn with a mean temperature of about $13^{\circ}C$. Drinking occurred mainly within 3 hours after feeding for the steers fed hay, while those fed soilage drank casually. Frequency of drinking (F) was related to the dry-matter concentration (DMC, %) of herbage: F = 0.47 (${\pm}0.09$) DMC - 6.5, $SE={\pm}0.4$, r = 0.86, P<0.01. Intake of drinking water for each 100 kg of live weight (IDW/100kg) for steers fed soilage was related to the dry-matter concentration: IDW/100kg = 0.55 (${\pm}0.06$) DMC - 8.7, $SE={\pm}0.3$, r = 0.94, P<0.01. The intake of water in each drinking period for animals fed fresh forage was curvilinearly related to the drinking frequency; for the hay-fed steers there was a negative linear relationship. When the drinking frequency for steers fed the fresh forage increased to the same as that observed for the hay, water intake in each drinking period was the same as found for the hay-fed steers.

• 환경위생공학
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• 제6권1호
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• pp.7-25
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• 1991

Until now, pure drinking water grnerally menas the water without taste, odor, general bacteria, coliform, and other exotic substance. Such a definition has been changing recently due to the finding of numerous other inorganic and organic substances unknown to us. 10 years ago, major causes of death were infectious agents and parasites contained in water, but recently, it has become apparent that some substances contained in drinking water cause cancer and heart diseases. We must drink about 2L of water everyday in order to maintain healthy condition. Waters used for drinking include tap water, well water, spring water, filtered water, etc., but the quality of drinking water has more polluted due to the industrial development and population increase. For example, industrial waste waters from industrial plants pollute the water supply sources ; toxic substances contained in the waste waters pollute the ground water sources by penetrating the geological strata, and municipal, livestock, public building waste waters also pollute the water supply sources. Sometimes, the polluted surface waters were announced to be polluted by various kinds of orgainc substance, and it is reported that the pollution of ground water by orga nic substances has few in number but high in its concectration comparing with those of surface water. As the water quality pollution level increases, so the amount of disinfectant also increase. For example, chlorine solution, one of widely used disinfectants, creates trihalomethane(THM), a carcinogen, and halogen compounds. According to Oliver, through chlorine disinfection process, humine substance and chlorine create bolatile organic halide and nonvolatile organic halide by chemical reaction. There are tens or hundreds filtering devices, but filtering principles and maintenance metjhods are different, so their efficiency tests are needed. According to Smith, the effeciency tests aginst over 30 Ameican filtering devices show that 10 devices can remove 85% of volatile organics and further studies on filtered waters are underway. In consideration of important impacts of polluted drinking water on national health, authors studied the state of water quality pollution against tap water used as drinking water, filtration device passed water, ground water, and conserved drinking water ; tested the efficiency of filtration devices for tap water ; tried to sep up the detection method by using ion chromatography based on negative ion and positive ion by using single column, and attemped the simple filtration method for general households.