• 생명과학회지
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• 제19권3호
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• pp.373-377
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• 2009

환경시료에서 많이 분리되는 장내바이러스 중 폴리오바이러스, 콕사키바이러스, 에코바이러스를 이용하여 정수처리 공정별 제거율을 조사하였다. 양성 시료로 사용된 바이러스들의 회수율은 72-108%의 범위로 나타났다. 이들 3종 바이러스들을 대상으로 정수처리공정별 제거효율을 조사한 결과 약 99%의 바이러스가 침전단계에서 제거되어졌고, 후오존과 BAC 여과과정을 거치면서 100% 제거되어짐을 확인할 수 있었다. 6개의 세포주를 사용하여 바이러스별 감수성을 조사한 결과 폴리오바이러스는 BGMK 세포주, 콕사키바이러스는 Vero 및 BGMK 세포주가 다른 세포주에 비해 높은 감수성을 나타내었고, 반면 에코바이러스는 RD 세포주에서 가장 분리가 용이하였다.

• 한국물환경학회지
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• 제27권6호
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• pp.830-840
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• 2011

Climate change has been settled as pending issues to consider water resources and environment all over the world, however, scientific and quantitative assessment methods of climate change have never been standardized. When South Korea headed toward water deficiency nation, the study is not only required analysis of atmospheric or hydrologic factors, but also demanded analysis of correlation with water quality environment factors to gain management policies about climate change. Therefore, this study explored appropriate monthly rainfall elasticity in chosen 41 unit watersheds in Nak-dong river which is the biggest river in Korea and applied monitored discharge data in 2004 to 2009 with monthly rainfall using Thiessen method. Each unit watershed drew elasticity between water temperature and water quality factors such as BOD, COD, SS, T-N, and T-P. Moreover, this study performed non-linear correlation analysis with monitored discharge data. Based on results of analysis, this is first steps of climate change analysis using long-term monitoring to develop basic data by Nak-dong river Environmental Research Center (Ministry of Environment) and to draw quantitative results for reliable forecasting. Secondary, the results considered characteristic of air temperature and rainfall in each unit watershed so that the study has significance its various statistical applications. Finally, this study stands for developing comparable data through "The 4 major river restoration" project by Korea government before and after which cause water quality and water environment changes.

• 한국농공학회논문집
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• 제48권3호
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• pp.35-45
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• 2006

Fallow paddy areas have been increased due to the import of cheap agricultural product, and the unbalance between farming cost and rice price since 1990. In domestic, rice production control that decrease paddy field area has been introduced for the control of rice demand and supply and stabilization of rice price since 2003. Because of the desire of paddy field's owner to create benefit by using paddy for other object, fallow paddy would be continuously increased. In the other aspect, many people in the world is suffering from hunger because of the shortage of food. In case of Korea, continuous drought and flood damages will be potential concern of stable food supply. From this viewpoint, the increasing fallow paddy area needs to be protected from the devastation by weed breeding for the re-cultivation. In this study, fallow paddy managed with the shallow pools and shallows was selected fur monitoring and analyzing of water quality and plant body change. As the results, the managed fallow paddy found to be effective in the purification of water quality and the control of plant growth.

• Membrane and Water Treatment
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• 제13권6호
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• pp.303-312
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• 2022

The natural hydrology and geological conditions of Xintian County was investigated, the development law of regional karst fissures was studied, the groundwater was collected and tested through a large-scale collection of groundwater to obtain the change law of chemical characteristics and water quality characteristics of groundwater, and the water quality evaluation was carried out for the regional karst groundwater in this paper. The results show that, the whole area is dominated by carbonate rock distribution areas, and the distribution of water systems is relatively developed. The strata are distributed from the Lower Paleozoic Cambrian to the Cenozoic Quaternary, and contain multiple first-order folds. The regional karst dynamic action is strong, and many tunnels or caves of different scales were shown, which are conducive to the enrichment of groundwater. Karst groundwater is neutral and alkaline water, the water is clear and transparent with good taste, and meets the national drinking water hygiene standards. The content of toxic trace elements and fluoride in the water source is generally lower than the limit value specified by the national standard and the accumulated toxic heavy metals is never found. The overall water quality is of good quality and suitable for the development and utilization of various purposes.

• 한국환경과학회지
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• 제5권3호
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• pp.347-359
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• 1996

A study was carried out on the distribution of chlorophyll a and water quality in the dry season in Yosuhae bay and adjoining sea, Southern Korea, in July of 1994. Concentration of salinity and phosphate were lower in the outer bay than in the inner bay. While nitrate and silicate were higher in the former than in the latter. We were identified with coastal waters of origin from China with the lower salinity in outer bay. The China coastal water was characteristic of high nutrients and phytoplankton biomass, such as chlorophyll a. The principal component analysis-(PCA) on the analytical data proved that high density of phytoplankton biomass , occurred under the condition of low salinity and high concentration of nissoived Inorganic nutrients. It is thought that the thermoharine structure and biological produtions of Yosuhae bay were controlled by the China coastal water in the outer bay.

• 대한환경공학회지
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• 제39권10호
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• pp.581-590
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• 2017

석문호 수질을 가장 효율적으로 개선하기 위한 최적의 방안을 마련하기 위해 본 연구에서는 지류하천의 수질 및 유량조사, 퇴적물 조사, 오염원 조사, 하천그룹화를 통한 중점관리 대상유역 선정을 포함한 다양한 분석을 수행하였다. 석문호 유역의 주요 지류하천은 대부분 BOD농도는 낮은 반면 COD농도는 높은 경향을 보였으며, 역천, 당진천, 시곡천, 백석천, 진관소하천, 장항소하천 등은 수질항목에 관계없이 수질농도가 높은 경향을 보였다. 석문호 유역 내 오염원은 생활계, 축산계 및 산업계가 대부분으로 지역에 따라 다양하게 분포하는 것으로 조사되었다. 석문호 수질개선을 위해 중점관리 대상하천으로 선정된 당진천, 역천, 백석천, 장항소하천 유역 내 위치하고 있는 오염원의 우선적인 저감이 필요한 것으로 판단된다. 석문호 수질개선을 위한 다양한 시나리오별 수질개선효과를 수질모델을 이용하여 정량적으로 평가한 결과, 유역 내 오염물질 배출량 관리를 위해 공공하수처리시설을 신설 및 증설만 하여도 호소 수질 V등급을 만족하는 것으로 나타났다.

• 한국수자원학회논문집
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• 제55권5호
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• pp.371-381
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• 2022

지류 하천은 본류에 비해 수질 변동성이 심하므로, 지류하천에 대한 효과적인 수질관리를 위해서 단일 수질 항목에 의한 평가보다 다항목의 영향을 고려한 종합적인 평가 방법이 도입되고 있으나 유역 특성이 고려되지 못하는 한계가 발생한다. 본 연구에서는 한탄강 중권역을 도시화율 및 가축분뇨 발생량, 산업폐수 배출량으로 도시 유역과 비도시 유역을 분류하고 수질 특성 분석 및 CCME WQI, RTWQI, NSFWQI 산정을 통해 유역 특성별 수질지수의 적합성을 평가하고자 한다. 수질지수 산정시 사용되는 수질항목이 수질지수 결과에 미치는 영향을 파악하고자 요인분석을 활용하였다. 요인분석 결과, CCME WQI와 TC, FC의 관계가 도출되었으며, 도시 유역에서 RTWQI와 DO, SS, 비도시 유역에서 NSFWQI와 FC의 관계가 나타났다. 하천생활환경기준 항목인 BOD, T-P 등급과 수질지수 비교를 통해 적합성을 평가하였을 때 도시 유역에서는 수질지수의 적합성이 낮은 것으로 나타났으며, 비도시 유역에서 RTWQI를 활용한 종합적인 수질 평가가 가능한 것으로 해석되었다.

• 한국환경과학회지
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• 제9권5호
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• pp.429-436
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• 2000

In order to study on the variational characteristics of water quality and chlorolphyll a concentration the water samples were collected daily or three times a week during the period from April 1990 to November 1991 at Kukdong port located in the northern Kamak bay of Southern Korea I made an analysis on biological factor as chlorophyll a concentration as well as physico-chemical factors such as water temperature salinity sigma-t dissolved oxygen, nutrients (ammonia, nitrite, nitrate, phosphate, and silicate) N/P ratio and chemical oxygen demand. In Northern Kamak bay seasonal variations in physical factors such as water temperature salinity and sigma-t were very marked. On the other hand chemical factors such as nutrients concentration and COD were not so. Chemical factors, in particular silicate were influenced by input of freshwater. And the roles of silicate on the seasonal succession of phytoplankton species composition was very low. Phytoplankton biomass as measured by chlorophyll a concentration was very high all the year round and it was controlled by the combination of several factors especially of N/P ratio determined by dissolved inorganic nitrogen.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2016년도 학술발표회
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• pp.204-204
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• 2016

Thailand had set the National Water Management Strategy which covered main six areas in the next 12 years, i.e., by priority: (1) water for household, (2) water for agricultural and industrial production, (3) water for flood and drought management, (4) water for quality issue, (5) water from forest conservation and soil erosion protection, (6) water resources management. However due to the climate change impact, there is a question for all strategies is whether to complete this mission under future climate change. If the impact affects our target, we have to clarify how to mitigate or to adapt with it. Vulnerability assessment was conducted under the framework of ADB's (with the parameters of exposure, sensitivity and adaptive capacity) and the assessments were classified into groups due to their different characteristic and the framework of the National Water Management Strategy, i.e., water supply (rural and urban), water for development (agriculture and others), water disasters (floods (flash, overflow), drought, water quality). The assessments identified the parameters concerned and weight factors used for each groups via expert group discussions and by using GIS mapping technology, the vulnerability maps were produced. The maps were verified with present water situation data (floods, drought, water quality). From the analysis result of this water resources management strategy, we found that 30% of all projects face the big impacts, 40% with low impact, and 30% for no impact. It is clear that water-related agencies have to carefully take care approximately 70% of future projects to meet water resources management strategy. It is recommended that additional issues should be addressed to mitigate the impact from climate risk on water resource management of the country, i.e., water resources management under new risk based on development scenarios, relationship with area-based problems, priority definition by viewpoints of risk, vulnerability (impact and occurrence probability in past and future), water management system in emergency case and water reserve system, use of information, knowledge and technology in management, network cooperation and exchange of experiences, knowledge, technique for sustainable development with mitigation and adaptation, education and communication systems in risk, new impact, and emergency-reserve system. These issues will be described and discussed.

• 한국물환경학회지
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• 제24권6호
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• pp.784-792
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• 2008

Greater focus must be placed on ensuring that the water quality model (WQM) reflects the objective of its application and the characteristics of the water environment properly before it is selected. In the development or application of WQM, various factors influencing the model predictions should be reviewed so that it can perform more properly and reasonably based on scientific theory. This study reviewed the characteristic of existing WQM and the domestic river environment to find the requirements of the model application for TMDLs management in Korea. In this study, a water quality model, QUAL-NIER, was developed based on the USEPA's QUAL2E. The core structure and reaction scheme of the model was established followed by the formulation of equations according to the scheme with some supplements on the reaction mechanisms which are necessary for domestic rivers. Algorithms on the equations were set up and programmed to form a computer-based model. The developed model, QUAL-NIER was applied to the main stem of the Nakdong river. The model was calibrated and verified to data measured in 2004. The model results displayed good agrement with the field measurements for both calibration and verification. From this study, it was concluded that the developed QUAL-NIER model was very powerful with regard to the water quality simulation in domestic rivers.