生态介质对农业面源污染中氮磷的截留效果  

Retention effect of eco-medium on nitrogen and phosphorus of agricultural non-point source pollution

作　　者：解清杰[1] 杜甫义 苏航 樊迪 

机构地区：[1]江苏大学环境与安全工程学院,江苏镇江212013 [2]镇江水业总公司,江苏镇江212000

出　　处：《江苏大学学报（自然科学版）》2016年第5期591-596,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省环保厅项目(2013037);江苏大学研究生科研创新计划项目(SJLX15_0508)

摘　　要：以模拟降雨径流造成的农业面源污染水体为对象,研究了快速大通量生态介质装置系统对其中氮磷污染物的去除效果.试验结果表明：在模拟不同降水强度下形成的降雨径流时,系统相继运行0.5,1.0和3.0h的情况下,对总氮的去除率分别稳定在44.63%～62.36%,38.59%～54.74%和29.69%～51.94%,对总磷的去除率分别稳定在67.20%～88.36%,56.08%～81.48%和38.62%～70.37%,较大幅度地去除了氮和磷;在生态介质装置的垂直方向,溶解氧质量浓度为0.23～5.61mg·L-1,为系统微生物的硝化反硝化反应提供较理想的环境;另外,NH4＋-N的去除主要由系统的沸石、陶粒层吸附和附着微生物硝化反应完成,TN的去除在装置的中下层由反硝化反应完成,TP的去除则是在石灰石层与金属化合物的吸附、沉淀反应完成.Eco-medium device with layered medium was used to remove nitrogen （N） and phosphorus （P） of agricultural non-point source pollution （NPS） caused by rainfall runoff. The experiment results indicate that the system has significant removal efficiency of N and P. In the simulation of rainfall runoff formation under different rainfall intensity running for 0.5 h, 1 h and 3 h, the removal rates of TN are 44.63% to 62.36%, 38.59% to 54.74% and 29.69% to 51.94% , and the removal rates of TP are 67.20% to 88. 36%, 56. 08% to 81. 48% and 38. 62% to 70. 37%, respectively. The mass concentration of dissolved oxygen （DO） at the vertical direction is 0.23 to 5.61 mg~ L-1 to provide ideal environment for microbial nitrification-denitrification. NH4 ＋ -N removal is mainly completed by adsorption and microbiological nitrification in the layer of zeolite and ceramic. TN removal is pushed by denitrification in the middle and lower unit. TP removal is achieved by precipitation reaction of phosphate and metal elements in the limestone layer.

关 键 词：生态介质 农业面源污染 氮磷 降雨径流 截留效果 

分 类 号：X52[环境科学与工程—环境工程]