In the urban water environment is getting worse and worse, because the large hundreds of industrial production facilities cause pollution is not working, to achieve the quality of sewage treatment equipment. In addition, a large number of sewage from the colonies were not directly expelled from the water after a period of treatment is reduced. It is estimated that the medical and Defense Department of resource and environment, an average of 30 people a year in Vietnam 9 deaths, because water and sanitation is poor. Among them, there is one of the main reasons about 2 million new cases of cancer found that the use of water pollution each year. Water pollution problem has been the concern of the whole society to the opportunity, especially Heavy metal pollution is the water of the toxin, affect the progress of mankind and the ecological security system at least 20 kinds of metal is defined as a poison and a half is caused by scattered in a large environment of image quality is critical to affect human health
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