| With the acceleration of urbanization,the improvement of living standards,People pay more attention to the development and utilization of water.Artificial lake,artificial river,landscape pond and other urban landscape water body gradually came into being and more and more close to people's real life.However,due to the lack of connectivity with natural water bodies,it has fewer ways of getting in and out.The overall mobility is poor,the exchange cycle is long,and the self-purification capacity is weak,and other factors such as inflow of sewage and surface run off,It is difficult to maintain water quality and protect good water environment.Although there are a lot of techniques applied to urban landscape water treatment,but because of the limitation of landscape water body,the management of landscape lake is very difficult in practice and the technical measures to maintain the urban landscape water environment are still in the exploratory stage.This paper took Siming Lake where at Guantang Town in Zhenjiang as the research object.In order to guarantee the quality and quantity of Siming lake.it has studied the technology of magnetic flocculation separation-purification of landscape lake water source and the technology of solar energy solar bionic aquatic plantslandscape water quality preservation.It provided technical support and engineering reference for water environment construction of urban landscape water body.The main contents and conclusions of this paper were as follows:(1)In the experiment of magnetic flocculation and purification of urban landscape lake,orthogonal experiment method and multi index comprehensive evaluation method were used to obtain the best process for purifying municipal landscape lake water by magnetic flocculation: Magnetic powder dosage of 100mg/L,PAC dosage of 150mg/L,PAM dosage of 2mg/L.(2)According to the process flow of the magnetic flocculation separation system,the parameters of the magnetic flocculation separation device were determined by the process parameters of magnetic flocculation treatment of the urban landscape lake,including the type of medicament,dosage,dosage method,hydraulic condition,residence time,etc.It designed a magnetic flocculation separation device by using the above results combined with the design of the water treatment.(3)By using the magnetic flocculation separation device to treat the class V polluted water source of lake,the water purification could be realized quickly and efficiently.The sludge floc could be separated from the water by the separation device,the turbidity of water was greatly reduced and the water was clear.Through the analysis of the experimental results,the best dosage of each agent was: PAC dosage 200mg/L,PAM dosage of 8mg/L,magnetic powder dosage of 100mg/L.The main pollutants in water index COD removal rate reached 45.57%,could reach the surface water class III water standard,there removal rate of TP reached 92.61%,could reach the surface water environmental quality standard II,they all fully met the landscape water replenishment requirements.(4)The treatment of the landscape lake water by the solar energy bionic aquatic plant device,through a month of treatment cycle,so that the turbidity of the experimental water was greatly reduced.It would also make COD index maintained in the surface water environment quality standard(GB3838-2002)class III level,ammonia nitrogen and TP in the maintenance of environmental quality standards for surface water(GB3838-2002)class II level,the water quality enhanced a grade.(5)This paper took Siming lake water where at Gutang town in Zhenjiang city as the research object,put forward the concrete scheme of magnetic flocculation and biological composite treatment process of Siming Lake Environment.To safeguard the Siming lake city landscape lake water environment,we used pollution control project,water treatment project,water purification project and artificial flow engineering And through the operation and management of long-term follow-up stability. |
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