Research Progress on Constructed Wetland for Advanced Treatment of Municipal Tailwater
Large discharge of tail water from municipal wastewater treatment plants at home,low reuse rate and high concentration of nitrogen and phosphorus are the main causes of water eutrophication.High concentration of nitrogen and phosphorus in tail water can easily lead to the proliferation of plankton such as algae in water,which can destroy the balance of oxygen consumption and reoxygenation and worsen the water quality.Nitrate nitrogen is the main nitrogen in tail water,and its removal needs organic matter as electron donor,while the C/N of tail water is low,which makes it difficult to purify effectively by conventional process and needs further advanced treatment.Therefore,based on the characteristics of municipal wastewater treatment plant tail water,this paper summarizes the ways to strengthen the efficiency of advanced treatment of municipal tail water by constructed wetland through literature induction,and mainly analyzes its strengthening mechanism from three aspects:substrate optimization,adding slow-release carbon source and process optimization,and puts forward the key and difficult problems in the research of advanced purification of municipal tail water by constructed wetland,which provides some ways to improve the quality of municipal tail water and protect the water ecological environment.
constructed wetlandmunicipal tailwaternitrogen and phosphoruslow ratio of C/Nadvanced treatmentenhancement approach
国家科技期刊平台
NSTL
万方数据
