An Experimental Study of Nitrogen Behavior Effect in the Course of Groundwater Recharging with Surface Water
石家庄地面水回渗地下过程的氮行为影响试验研究

Shijiazhuang is one of the cities in North China whose groundwater levels have declined terribly. The Hutuo River is near Shijiazhuang, and recharging groundwater through its wide riverside characterized by favorable hydrogeological conditions for groundwater recharging is very practical. However, the change of the groundwater quality after recharging is a problem which deserves detailed studies. In the course of recharging, it is very difficult to remove nitrogen, which restricts the removal of other wastes. The authors therefore experimented on the removal of nitrogen. In this experiment, silver sand on the Hutuo Riverside and silver sand mixed with a certain proportion of clay could remove a certain amount of ammonia-nitrogen, but the capability of sand for removing nitrogen decreased as the experiments went on. Adding alkalinity to the sand could solve the problem. At the same time, the effect of removing nitration-nitrogen was not remarkable. When a certain volume of ethanol and some bacteria of denitrification were added, the removal efficiency sharply rose.