【摘要】 以桂林桃花江介质筛护岸工程为依托,对介质筛护岸的水质净化功能进行了试验研究.结果表明,介质筛护岸两侧水位波动促进了生物地球化学反应的发生.介质筛护岸对COD、NH4+-N和TN的平均去除率分别为76.5%、95%和81%.介质层内的COD浓度逐层降低,在距离岸边2.5m左右的沸石强化层中,其浓度接近5mg·L-1;在介质筛的第5、6层内NH4+-N的浓度基本稳定在0.3mg·L-1.沸石层对NH4+-N吸附的有效厚度为10cm,能够满足水质净化的目的.更多还原

【Abstract】 Water purification experiments were conducted in a media-sieve embankment(MSE)with zeolite barrier,in the Taohuajiang river,in the city of Guilin.Fluctuation of the water table on both sides of the MSE promoted water purification by way of a biogeochemical process.Average removal rates of COD,NH+4-N and TN in the MSE were 76.5%,95% and 81%,respectively.The concentration of COD gradually decreased from outside to inside in the MSE.In the tested zeolite barrier,about 2.5 m away from the bank the concentration of COD was close to 5 mg·L-1.Concentrations of NH+4-N in the fifth and sixth layers were stabilized at 0.3 mg·L-1.An effective thickness(10 cm)of the zeolite barrier could adsorb NH+4-N completely and meet the requirement of river-water purification.更多还原