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Study on Nitrogen Migration and Accumulation Properties in the Riverbed Sediment
Pages: 60-63
Year: Issue:  11
Journal: Yellow River

Keyword:  total nitrogen contentnitrogen adsorptionriverbed sedimentsoil column experimentFenhe River;
Abstract: Based on the penetration and migration tests of nitrogenous pollution in riverbed sediment soil columns of Fenhe River typical sections, this paper analyzed the change process of riverbed sediment total nitrogen content with time and the influence of sediment texture on nitrogen content and distribution. The result shows that the nitrogen content of riverbed sediment increases with time in the stages of river sewage to the riverbed sed-iment both unsaturated and saturated infiltration. For riverbed sediment with good permeability,infiltration moisture flux is large and the adsorption ability is low,and the adsorption and mechanical dispersion processes of solute complete basically in the unsaturated infiltration process;while for sediment with poor permeability,infiltration moisture flux is very small,and the adsorption and mechanical dispersion processes of solute can’t completely finish in the unsaturated infiltration procedure;the limitation of negative charge on sediment particles surface decides the limitation of ni-trogen adsorption and the structure of the sediment decides the limitation of mechanical dispersion. No matter the permeability of sediment is good or not,when infiltration reaches to a certain time,as nitrogen removing in the sediment,convection mechanism will play a dominant role,i. e. ,ni-trogen carried by infiltration water transports or discharges to the deep layer along with the water through the pores of sediment.
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