Research on the Vertical Migration Regularity of Nitrate and Organic Matter in Sand Column

摘要

The study of organic material and nitrate pollution in ground water,more and more attracted people's attention.Leaching of nitrate and organic matter in the soil not only affects the fertility of soil,but also becomes the main source of groundwater pollution.This thesis mainly discussed the vertical migration regularity of organic matter and nitrates in certain flow velocity.The results showed that the particle size of the medium can greatly affected the migration regularity of TOC and nitrates.The curve of nitrate migration was more complex than that of organic matter migration.The order of retention capacity with organic matter and nitrate was clay,coarse sand and fine sand.