Experiment on Migration and Transformation of Nitrate under Interaction of Groundwater and Surface Water
Yan Ya'ni
Ma Teng
Zhang Junwen
Liao Man
Wang Zhizhen
Abstract：At present,the situation of water nitrogen pollution in the world is grim,and nitrate (NO3--N) pollution is the main form.To study the effects of groundwater and surface water (G-S) interaction on the migration and transformation of NO3--N in the hyporheic zone (HZ) is the key for comprehensive prevention and control of water nitrogen pollution.Three modes of NO3--N migration and transformation experiments,including surface water (S) supply for groundwater (G) (downwelling),groundwater (G) supply for surface water (S) (up-welling) and the alternative mode,were carried out in the study.It is found that NO3--N concentration of three modes effluent can be reduced more than 95％;the strength of denitrification in up-welling was greater than in down-welling;the contribution of the dissimilation reduction (DNRA) to the ammonia nitrogen (NH4 +-N) concentration in the outflow of down-welling and up-welling was about 71％ and 11％,respectively.After upwelling experiment,the organic nitrogen content of water-soil interface was 2.3 times as much as the down-welling experiment.It was shown that the NO3--N attenuation pathways under the G-S interaction mainly include denitrification,DNRA and the synthesis of organic nitrogen;G-S interaction modes had effects on the strength of each NO3-N attenuation pathway;HZ media could intercept nitrogen through the adsorption of NH4 +-N and microbial synthesis of organic nitrogen.
Keywords：groundwatersurface waterinteractionnitratedenitrificationdissimilatory nitrate reduction to ammoniumsynthesis of organic nitrogenhydrogeology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 783-792 )