| Urban lakes not only play an important role in environmental improvementã€climatic regulation and flood storage,but also provide much ecological service for residents such as recreationã€leisure entertainment and traveling. Based on the collection of water quality monitoring data in 2010-2014,this paper makes a water quality present evaluation,explores the water quality influencing factors for the natural Cihu Lake in Huangshi City,proposes ecological protection measures and management suggestion.First, give a further investigation of quality pollution 〠pollution sources ã€eutrophication and sediment. Make a water quality present evaluation by combining the single factor pollution index with the Nemerow Pollution Index,as a result,Cihu Lake is the moderate pollution in 214. By using comprehensive nutrition state index and geo-accumulation index method,the eutrophication and sediment heavy metals in this lake is assessed, the research shows that cu and pb are the main heavy metal pollutants.Second,obtain the 3 principal component by analyzing the 13 pollutants with the application of Principal Component Analysis. By making the load value analysis for the 3 principal component with each pollutants,find that nitrogen source and organic carbon source are the main pollutants for Cihu Lake at present.Finally,put forwards ecological restoration method to reduce the ecological system of water environment in Cihu Lake,according to the result of present evaluation. Using aquatic plant community recovery,shorten transition process of lake from algae type to grass type eco-system on the premise of sewage interception of the whole line. Then this paper emphasizes the computation of verification on water purification by constructed wetland system, the outlet water meets the III standard of GB3838-2002《Surface Water Environment Quality Standard》,after processing by the constructed wetland system, lifting by the lift pump. |
PDF Full Text Request