不同基质在人工湿地脱氮中的应用及其研究进展

在比较了不同基质脱氮效率的基础上,认为基质作为人工湿地的重要组成部分,在为植物和微生物提供生长介质的同时,也能通过沉淀、过滤和吸附等作用直接去除污染物质,其中基质的类型、级配等因素会影响基质作用的发挥;不同基质对脱氮性能存在较大差异,沸石和蛭石是目前研究中脱氮效率较高的两种基质。在归纳了脱氮机制和影响因素的基础上,认为不同基质由于脱氮机制不同,脱氮性能和脱氮效率也存在较大差异;人工湿地基质所有理化性状都可能影响到它对污水的脱氮效率。最后,对今后的相关研究方向进行了展望。

Application and research progress of different substrates in the nitrogen removal of constructed wetlands

The application of different substrates in the nitrogen removal of constructed wetlands was reviewed.Substrates played an important roles in constructed wetland,not only on provide nutrient for growth of plants and microbes,but also wipes out the pollutants through its strong adsorption and filter ability.The type of substrates and filling nodes were the main factors that influencing the nitrogen removal.Nitrogen sorption capacity of different substrates was significantly different;zeolite and vermiculite were considered as preferable substrates on nitrogen removal in progress.Base on the comparison of nitrogen removal performance of different substrates,the nitrogen removal mechanisms and characteristics of several common substrates were concluded.Different nitrogen removal mechanisms led to different nitrogen removal property and efficiency.All the physicochemical properties of substrates in constructed wetland would affect the nitrogen removal.The selection and configuration of substrates in constructed wetland were discussed.In addition,a prospect on future studies and relevant suggestions were given in this paper.