Comparative Studies On Antisepsis Effects In Landscape Water By Different Technologies

With the development of social economy and the improvement of people's living level, landscape water has entered people's life. As the leisure and entertainment place, landscape water can improve city environment and purify city air.Landscape water is closed and flows slowly, so its purification ability is weak. If nutrients accumulated are too much, landscape water will become stink and darkening. So it is easy to corrupt to damage the city environment. It is a serious problem to city constructors.In the study of antisepsis of landscape water for practical applications, the landscape water had been treated with biological filter, UV irradiation and sodium hypochlorite, respectively. In order to explore the best way of antisepsis and provide scientific evidence for preventing eutrophication, the nutrition indices were evaluated by detecting the content of TN, TP, COD and chla in landscape water.Simulating the landscape water eutrophication in different seasonal of spring, summer, autumn and winter. In the process of landscape water eutrophication, the TN and TP contents of landscape water were continuous increase. The growth rate of TN and TP contents in winter was the most slowly. In the fifth weeks, the growth rates of TN and TP contents in spring, summer, autumn were similar. But after five weeks, contents in summer were lower than spring and autumn. The content of chla of landscape water in winter was sustainably low. In the fifth weeks, the growth rates of TN and TP contents in spring, summer, autumn were low. After five weeks, contents were increase rapidly. The eutrophication degrees were increase in four seasonal. They were 60,61,63 and 21 in the tenth week.In the study of antisepsis of landscape water for practical applications, the landscape water had been treated with biological filter, UV irradiation and sodium hypochlorite, respectively. The result showed that the TN and TP contents treated by biological filter decreased to 0.3 mg/L and 0.01 mg/L, with the removal rates 78.8% and 61.3%, significantly lower than that of the other two treatments. It was the same case for the content of chla and COD, with less fluctuation. The eutrophication degree had decreased to below 50 since the eighth week, maintaining at a moderate level. From it we can see that the treatment of biofilter could effectively prevent the spoilage of landscape water. The landscape water corrupted had been treated with biological filter, UV irradiation and sodium hypochlorite. The removal rates of TN and TP were decreased in earlier weeks, and increased in later weeks. Removal rate of biological filter was the highest. The chla removal rate of biological filter was about 65%, COD was 40%. They were higher and stabilities than other treatments. From it we can see that the treatment of biofilter could effectively prevent the spoilage of landscape water.