|
The water quality of Paldang reservoir has been deteriorating with years due to urbanization, livestock farming, and other activities along the river. Many people pointed out the livestock wastewater would be a major water pollution source of the Nam-Han river eventually introduced to Paldang reservoir which is the tapwater resource for residents in the metropolian area and its more than 10 satellite cities. The water pollution caused by livestock production was investigated to quantify its contribution to overall water pollution in the Nam-Han river in this study. Water samples were taken at sixteen sites representing livestock production sites, residential area, crop farming area, and others, six times each in dry season(December 1998∼June 1999) and rainy season(July 2000∼September 2000) to explore the seasonal and industry operational variation of water pollution in Yangpyung area. The calculation showed livestock wastewater is responsible for 3.7%, 8.9% of total BOD_5 loading in the dry and rainy season respectively, while municipal wastewater contributed 89.8% and 83.1% each of overall water pollution in the Nam-Han river. Additional municipal wastewater treatment plants may need to reduce the input of sewage introduced to the Nam-Han river. Further reduction of pollution loading can be made by subsidy of bedding material to livestock growers and by encouraging to cover livestock waste piles collected from the floor of the house to prevent leaching from raining.
|