利用北调江水回渗地下的除氮实验研究

Experimental Study on Denitrogenation of Surface Water Used to Recharge Groundwater

利用地表水回渗补充地下水是当前解决淡水资源缺乏的重要措施之一,但是回渗后的水质及对地下水的影响如何仍是一个需要探索的问题。在回渗过程中,氮素的去除对其它污染因子的去除具有限制性影响。本文以石家庄滹沱河河床细砂为滤料做了土地快速渗滤系统(RI)去除回灌水中氮素的模拟实验。结果显示,利用2m厚的滹沱河细砂土及其与黏土按一定比例的混合砂土层,可对回渗水中的NH_4^+形成一定容量去除,且单位重量砂土对NH_4^+的截留量随回渗次数的增加而急剧下降,采用人工添加碱度的办法可消除这种下降趋势。同时,结果显示对回渗水中NO_3^-的去除率不高,但是若采用人工添加乙醇碳源和接种优势脱氮微生物菌种方法,NO_3^-的去除率会得到较大提高。

It is one of the important measures of resolving freshwater lacking to recharge groundwater with surface water, but its effect to groundwater is still a problem worthy continued studying. In the course of filtering, the management of N is the restrictive factor to the management of other pollutant factors, The simulative experiment of using fine sand of Shijiazhang Hutuo River as filtering material in land rapid infiltration system （RI） to manage in surface water has been done. The result shows that Hutuo River＇s fine sand and its mixture with different proportional clay of 2 m can effectively manage the NH4^＋ in the water, but its capacity to manage the NH4^＋ decreases as times increase, alkalinity can be added to eliminate this trend. On the same time, the sand and mixture cannot effectively manage the NO3^-, if some organic nutrient is added, the efficiency of denitrification will be greatly improved.