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Development of a Groundwater Quality Sampling Method for Livestock Excreta Survey

가축분뇨실태조사를 위한 지하수 오염현황조사 지점 선정 방법 개발

  • Kim, Deok-Woo (Watershed and Total Load Management Research Division, Water Environment Research Department, National Institute of Environmental Research) ;
  • Ryu, Hong-Duck (Watershed and Total Load Management Research Division, Water Environment Research Department, National Institute of Environmental Research) ;
  • Baek, Unil (Watershed and Total Load Management Research Division, Water Environment Research Department, National Institute of Environmental Research) ;
  • Kim, Sunjung (Watershed and Total Load Management Research Division, Water Environment Research Department, National Institute of Environmental Research) ;
  • Shin, Dong Seok (Watershed and Total Load Management Research Division, Water Environment Research Department, National Institute of Environmental Research) ;
  • Lee, Jae Gwan (Watershed and Total Load Management Research Division, Water Environment Research Department, National Institute of Environmental Research) ;
  • Chung, Eu Gene (Watershed and Total Load Management Research Division, Water Environment Research Department, National Institute of Environmental Research)
  • 김덕우 (국립환경과학원 물환경연구부 유역총량연구과) ;
  • 류홍덕 (국립환경과학원 물환경연구부 유역총량연구과) ;
  • 백운일 (국립환경과학원 물환경연구부 유역총량연구과) ;
  • 김선정 (국립환경과학원 물환경연구부 유역총량연구과) ;
  • 신동석 (국립환경과학원 물환경연구부 유역총량연구과) ;
  • 이재관 (국립환경과학원 물환경연구부 유역총량연구과) ;
  • 정유진 (국립환경과학원 물환경연구부 유역총량연구과)
  • Received : 2018.09.05
  • Accepted : 2018.11.05
  • Published : 2019.01.31

Abstract

The groundwater quality through livestock excreta survey based on "Act of the management and use of livestock excreta" was investigated by selecting sampling sites within 1 km of the farmland without considering hydrogeological units. However, these sites can be affected by various pollution sources such as chemical fertilizers and livestock excretions. Additionally, the effects of pollution sources on groundwater quality in the sites cannot be clearly distinguished from naturally occurring backgrounds. In this study, a method was developed to select the sampling sites for groundwater quality through livestock excreta survey in order to understand the effects of pollution sources especially livestock excreta. First, the concentrations of nitrate within the radius of 200 m, 300 m, 500 m and 750 m, respectively, from the farms regarded as pollution sources in hydrogeological units were compared in 2016-2017. All the nitrate concentrations at 200 - 500 m from the farms exceeded a background concentration, 13.3 mg/L. Those at 750 m and the background concentrations measured by the Ministry of Environment were comparable. Therefore, the appropriate radius was suggested as 500 m for livestock excretions survey. In this study, the areas within 500 m from the farms could be considered under the influence of livestock excretions, while those beyond 500 from the pollution sources as background in hydrogeological units. The developed method was validated by applying it to the sites selected based on both administrative divisions and watersheds for livestock excretion survey. The average densities for the developed method were 0.82 and 0.39 points/km2, respectively, which were considered as appropriate levels according to those of the European Environmental Agency.

Acknowledgement

Grant : 공공수역 녹조발생 대응

Supported by : 환경부

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