Urban Non-point Source Pollution And Its Control

Currently, the water resources shortage is one of the essential problem in the world.Not only facing a missing problem of the fresh water resources, but also existing a problemof limited fresh water resources polluted seriously. Being the urbanization speedly, the urbanneeds amount of water to supply the industry and agriculture produce process. The a seriesof problem was producing, such as ecosystem balance and environmental pollution, Whenthe urbanization turns to bring an economic benefit and social performance for mankind.Among them, the environmental pollution problem of the surface water is particularlyoutstanding. In the urban and its downstream region, the surface water pollution isespecially severity. Because the point source pollution have already been included in theenvironment programming item among them, the source of pollution is controlled basically.But still have 30%-50% earth's surface waters have been polluted by the non-point sourcepollution. The pollutant source is extensive, origin and category complications, trasport andtransformation not easily certain, the downstream is influence to the water body greatly, sothe research is importance about the urban's non-point source pollution. It can improveurban ecosystem environment, and promote the urban keep on development.Thesis has adopted the experiment research about the urban non-point source pollutionexample jilin siping. Listed below the land types have been makes use of, such as residentialarea (apartment house -half deeply water ground, the small unit house-deeply the waterground), park and afforest ground (plant rate to reach to 70% above-deeply the waterground), building land(half deeply water ground),the land of industry uses(the foodindustry-half deeply water ground), Street(prosperous district-waterproof ground), theriver(south river and north river).Make use of one rain-storm(rainfall is 17.1 mm) to sample,and determine the pollutant consistency. The pollutant category that chooses an examinationhas: TN, NH3-N, BOD5, CODCr.Thesis used mathematics model and the 3S technique computed to the non-point sourcepollution load. The result enunciation, the urban land types contribute to dissimilarity for thenon-point source pollution. In the pollution load of land types, the first is the building land,the second is industry land, apartment house residence and the small unit house residence,the street and square, the least of is a park and afforest ground. Assurance pollute loadprovide a basis to control the urban non-point source pollution to. This thesis put forwardtwo kinds of methods in the urban non-point source pollution control. One is adopt thelandscape pattern optimization measure. According to the ecosystem programming principle,improving the urban landscape pattern and promoting the material circulation and energyflow of the urban ecosystem system, supporting the stability of the urban ecosystem systemand the sustaining development. Two is the rain water recycling measure. The basic powerthat produces the urban non-point source pollution is the rain-storm runoff. This thesisargument the rain water recycling measure contributes to control the urban non-point sourcepollution and the urban water resources persisting utilization.