人工湿地在污水处理厂尾水水质净化中的应用

Application of constructed wetland system in purification of tail water quality of sewage treatment plant

人工湿地既能净化水质,又能带来良好的生态效益与景观效益,促进水体维持良好状态,经常作为辅助手段,解决黑臭水体问题。以河南某污水处理厂为例,研究人工湿地系统在污水处理厂尾水生态净化中的应用。结果表明:1)人工湿地系统适用于污水处理厂尾水的生态净化和水质提升,水体修复效果良好,COD、BOD_(5)、氨氮和总磷各类污染物的平均去除效率分别为45.88%、44.82%、72.71%和52.06%;2)人工湿地系统对各类污染物的去除效果呈现季节性变化,冬季去除效率相比夏季较弱,加强人工湿地系统在冬季运行过程中的保温措施,有利于保障湿地的污染物去除效率和运行效果;3)水质生态净化过程中需采取相应的人工湿地运行维护措施,减缓湿地系统渗透速率下降和堵塞问题的发生,实现人工湿地系统良好的污染物去除效率和运行效果。实践证明,人工湿地系统作为污水处理厂尾水处理的主要工艺,可有效净化水体中的污染物,还可与周边的生态景观相结合,具有较大的实用价值、较高的环境效益和生态效益,应用前景广阔。

Constructed wetlands can not only purify water quality, but also bring good ecological and landscape benefits, promote the maintenance of water bodies in good condition, and are often used as auxiliary means to solve the problem of black and odorous water bodies.This paper takes a sewage treatment plant in Henan as an example to study the application of constructed wetland system in the ecological purification of sewage treatment plant tail water.The results show that: 1)The constructed wetland system is suitable for ecological purification and water quality improvement of sewage treatment plant tail water.The water body restoration effect is good.The average removal efficiencies of COD,BOD;,ammonia nitrogen and total phosphorus were 45.88%,44.82%,72.71% and 52.06%,respectively;2)The removal effect of various pollutants by the constructed wetland system shows seasonal changes, and the removal efficiency in winter is weaker than that in summer.Strengthening the thermal insulation measures of the constructed wetland system in the winter operation process will help ensure the pollutant removal efficiency and operation effect of the wetland.3)In the process of ecological purification of water quality, it is necessary to adopt corresponding constructed wetland operation and maintenance measures to slow down the drop in penetration rate and blockage of the wetland system, and achieve good pollutant removal efficiency and operation effect of the constructed wetland system.Practice has proved that the constructed wetland system, as the main process for the tail water treatment of the sewage treatment plant, can effectively purify the pollutants in the water body, and can also be combined with the surrounding ecological landscape.It has greater practical value, higher environmental benefits and Ecological benefits and broad application prospects.