The Regulation Evolution Of District Landscape Water Quality And The Research Of Cycle Processing Technology

Landscape water has become a necessity at modern residential area nowadays. People's water affinity and their organ's sense demand can be satisfied by landscape water. What's more, landscape water can regulate regional microclimate, get more poetic sentiment and energy. However, most landscape water bodies are static or poor flowing named slow-flow water bodies. Because they have small area, shallow water depth, weak self-purification capacity, polluted by resident, rain water and trash easily which accumulate pollutants, even cause eutrophication. Thus, most of them lose landscape water bodies function. Nevertheless, the property department usually keeps fresh water quality by emptying lake water periodically, which does not meet the national energy saving policy.The topic takes a landscape lake water body located at a residential area which developed by Greenland Group at high-tech zone Xi'an as an object. The water quality can basically reach the landscape water quality standard except that chromaticity and CODcr are much higher than the standard during monitoring time by monitoring the water quality and analysis its changing pattern. However, NH3-N,TN,TP,CODcr and so on are act as accumulation tendency in the lake water.By comparison, it is found that the Dispersed-Ozone Floation(DOF) has excellent efficiency to cope with artificial landscape water bodies, under the condition that the reflux ratio of 0.5 and the running parameters: the dosage of PAC is 40mg/L, Dissolved gas pressure is 0.3 Mpa, Ozone dosage is 5mg/L, the average removal rate of NH3-N is 9.35%, the average removal rate of TN is 24.9%, the average removal rate of TP is 17.5%, the average removal rate of COD is 31.5%, the average removal rate of colourity is 42.3%. These indexes mentioned above are satisfactory according to landscape water standard。By calculated, the daily maximum quantity of pollutant collected in the lake is: 7.505g for NH3-N, 23.9g for TN, 0.774g for TP, 997.09g for COD.the average removal amounts of pollutants by Dispersed-Ozone Floation process in the lake are: 11.1g for NH3-N, 83.8g for TN, 3.9g for TP, 6.268kg for COD. It explained that the processing system is suitable to the Greenland residential area landscape lake water quality as a circulation technology and it can maintain the landscape water quality the stable.