人工湿地对有机农药烟嘧磺隆去除的试验

为了解人工湿地对有机农药的去除效果,选取有机农药烟嘧磺隆为研究对象,考查了水平潜流人工湿地和垂直潜流人工湿地在不同水力负荷条件下对烟嘧磺隆的去除能力,并考察了人工湿地中植物和填料对烟嘧磺隆的去除作用.研究结果表明,随着水力负荷的增大,人工湿地对烟嘧磺隆的去除率逐渐降低;在相同条件下,水平流人工湿地对烟嘧磺隆的去除效果优于垂直流人工湿地;人工湿地植物对烟嘧磺隆有一定的吸收作用,且植物根系起主要作用,菖蒲对烟嘧磺隆的耐受性高于水葱;湿地填料对烟嘧磺隆具有吸附作用,其中沸石和砾石对烟嘧磺隆的吸附程度高于钢渣.

Experimental Study on Removal of Organic Pesticide Nicosulfuron by Constructed Wetland

To investigate the removal of pesticides by wetland, organic pesticide nicosulfuron was selected as the test substance. Removal of nicosulfuron was investigated using horizontal subsurface constructed wetland and vertical subsurface constructed wetland under different hydraulic load conditions. The roles of plants and media in the constructed wetlands in the removal of nicosulfuron were also studied. The experimental results indicate that with the increase of hydraulic load, the removal rate of nicosulfuron in both constructed wetlands decreases. Under the same conditions, the removal of nicosulfuron by horizontal subsurface constructed wetland is better than that by vertical subsurface constructed wetland. Plants in both wetlands can uptake nicosulfuron, and roots act important role. Calamus can tolerate nicosulfuron better than softstem bulrush. The media in the wetlands can adsorb nicosulfuron, and the adsorption capacity of zeolite and gravel are greater than that of steel slag.