通过结构改良提高透水铺装的脱氮性能研究

Improving the denitriding performance of permeable pavement through structural improvement

本研究通过合成雨水模拟试验,设计了4个不同结构的透水铺装,测试了它们在不同污染物浓度及不同降雨强度下的雨水径流脱氮能力。结果表明:在低强度降雨条件下,各试验组的脱氮效果均较好,但在中等和高强度降雨条件下,与代表普通透水铺装的试验1相比,基层中添加了木屑层和饱和层的试验2具有良好的氨氮和硝酸盐去除性能;添加了沸石层的试验3和试验4,虽然能够提高NH4-N的去除率,但对NO3-N的去除效果有负面影响;不同入水污染物浓度条件下,试验2都表现出最好的脱氮效果。建议在普通透水铺装中添加有机碳源和饱和层,以提高系统的脱氮能力。

In this study,through synthetic rainwater simulation experiments,four permeable pavements with different structures were designed,and their denitrification capabilities of rainwater runoff under different pollutant concentrations and different rainfall intensities were tested.The results showed that under low-intensity rainfall conditions,the denitrification effects of all tests group were better,but under medium and high-intensity rainfall conditions,compared with Test 1 which represents ordinary permeable pavement,Test 2,with a wood chip layer and a saturated layer were added to the base layer,had good performances of removing ammonia nitrogen and nitrate.Tests 3 and 4 with the addition of the zeolite layer increased the removal rate of NH4-N,but had a negative impact on the removal of NO3-N.Test 2 showed the best denitrification effect under different pollutant concentration conditions.It is recommended to add organic carbon source and saturated layer to ordinary permeable pavement to improve the denitrification capacity of the system.