On June 23rd, the fourteenth session of the Shanghai Municipal People's Congress of the thirtieth session "(Revised Draft) Shanghai Environmental Protection Ordinance" for the water pollution problem, the Committee believed that, at presently the phenomenon of secretly pouring and discharging of the production waste-water in the shipping out is quite serious, and seriously affecting the safety of drinking water. People can not live without water, the production waste-water directly discharge may not only cause groundwater pollution, but also cause serious soil pollution. In view of the current Shanghai sewage pipe network construction is quite completely, the forbidden on the production waste water treatment by shipping out has practice feasible.

 

Recently, with the soil pollution around schools and other news was broken, soil pollution has already caused public concern. Soil pollution can be divided into two categories of inorganic and organic pollutants. Inorganic pollutants include acids, alkalis, heavy metals, and radioactive elements; organic pollution is mainly organic pesticides, petroleum and urban sewage, sludge and so on. Compared to the atmosphere, water pollution, the soil problem has the properties of hidden, hysteresis, accumulation, regional and irreversibility, therefore, its governance is difficult, and requires a long term. However, I think the key in the soil pollution is the prevention, what is to say the source control. Production and domestic waste water, sludge and other emissions are the major cause of soil pollution.

 

Tungsten trioxide has a narrow band gap, can effectively respond to visible light; as a photocatalyst, it can be used to treat the polluted water which contains organic and inorganic pollutants. Studies have shown that the photocatalytic of tungsten trioxide photocatalyst can solve the problem of pollution chromium, mercury, lead and other heavy metals; moreover, it also plays an extremely high utility in COD removal and organic matter degradation of the polluted water.