Study Of Optimization On Purifying Landscape Water With Consructed Greenland

Landscape water is an important component of our dwelling environment,and it shows significant impact during the construction of urban ecology.It is necessary to purify the polluted landscape water because of various pollution and severe present status.Costructed greenland system is one of the focus due to its ecological,scenical and economical performance.The reason of landscape water pollution is the breakdown of the ecological equilibrium according to ecology view. It leads to eutrophication of the water by the reason of more inlet of organic matter and nutritive salt than outlet. Costructed greenland was constructed to treat the water of East Lake of Wuhan in my study.The conclusions are as following:(1) The purifying efficiency of COD, TN and TP by costructed greenland was good, and the water quality was improved a little. The COD, TN and TP of East Lake of Wuhan were improved 1-2 grades after we assayed and compared the quality of raw water and effluent water. The plants in costructed greenland also had beautification performance aside from purification performance.(2) Hydraulic loading rate is a significant parameter of the treatment efficiency. The capability of costructed greenland intercapting, removing and trandferring pollution was proposed by analyzing the removal quantity on per square meter on five different hydraulic loadings condition. It was concluded that the optimal parameter of hydraulic loading rate was 0.95m~3/m~2·d considering the treatment efficiency of COD,TN and TP.(3) The removal efficiency of TP is weaker than that of COD and TN.The filler with higher absorption efficiency of phosphorus must be found.We studied the absorption isothermal of six kinds of fillers, and langmuir absorption isothermal was used to describe processes of absorption., finally we discovered that the flyash ideally had higher absorptive capability and the spontaneous of the absorptive reaction is stronger than other fillers. The flyash is suitable for the filler of costructed greenland by reason that we easily get it and it is the byproduct of industrial process.(4) The filtration of the choths-filter-jar depend on filter mediums in them compared with costructed greenland. They have higher filtration capability and little floor area, but the removal efficiency and ecological performance and scenical performance are weaker than costructed greenland. When we put some chemical substance to advance the reaction, we found the removal efficiency of the filters were limitedly improved.