科研之友
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摘要
Surface and groundwater quality on inorganic nitrogen (N) was monitored ill the fanning villages of Laivu commune Kimthanh district, Haiduong province of northern Vietnam In these villages, pig raising in the farm households has been enhanced since 2001, and the households feeding 10 to 150 pigs in a year amounted to 28 6% of total households of the commune Monitoring was done at five times of a two-month interval during August 2007 and April 2008 The ammonium concentration was always higher than the nitrate-N concentration and showed temporal and spatial variations in both surface and groundwater The temporal variation was rather wavy and the steady increase with time was not recognized The spatial variation was ascubed to the difference in the the intensification of pig raising among die villages Both surface and groundwater were found to be seriously contaminated with ammonium-N in Lauvu commune The ammonuim-N concentration was remarkably higher than the Vietnamese water standards for drinking purpose Waste water and solid discharged directly from piggeries without any prevention treatment was identified as a source of N contammating surface and groundwater. Attention should be paid to the alaimingly high level of ammonium-N in the surface and groundwater in the intensively livestock-raising as well as fanning villages of the Red River Delta
- 出版日期2010-2
