河流渗滤系统对硝态氮污水的净化作用研究

Purification of nitrate-nitrogen in river filtration systems

河流渗滤系统对入渗的地表水有一定的净化作用,过去人们很少从理论上研究河流渗滤系统对污染河水的净化作用。本文采用室内土柱实验装置来模拟渭河渗滤系统,研究了硝态氮污染的河水在该系统中的环境行为及净化机制,其环境行为主要为反硝化作用。其净化程度与该渗滤系统的渗滤介质有关,如果渗滤介质为粘土,其净化率达到100%。若介质为粗砂粒物质,其净化程度较低。

River filtration systems purify surface water flowing through this system to some extent, but degree of purification is not known. In this paper, infiltration experiment instruments of a laboratory soil column was designed, and environmental behavior and purification mechanisms of nitrate-nitrogen penetrating into a river filtration system were examined. Denitrification is a dominant reaction for the nitrate-nitrogen in the soil column infiltration system. The purification degree is related to the sediment medium. Evidence of the experiment indicated that denitrification is significant in the soil column filtration system. The removal rate of nitrate-nitrogen is high as 100 percent, but the removal efficiency is bad in a sand column with aquifer materials, in which denitrification is very weak.