every day there is a large amount of garbage discharged into the environment without treatment besides increasing population led to the amount of garbage also increases. In developed countries, the rate of population increase of about 5%, while the rate of population increase in the developing countries is more than 2%. in Vietnam with rapid population growth has put our country on the twelfth in the most populous country in the world. In less than 50 years (1960-2013), the population of our country increased almost 4 times from 30.172 million to 90 million. The population increased the demand for water for living use and increased economic development, waste sources increases, the water pollution also increases. domestic wastewater (Domestic wastewater): is the wastewater generated from households, hospitals, hotels, schools, containing the waste in the process of living, human hygiene. The basic components of the waste water is the organic biodegradable prone (carbohydrate, protein, fat, oil), nutrients (nitrogen, phosphorus), solid. Depending on the standard of living and lifestyles that waste water as well as download the amount of substances contained in waste water of each person in one day is different. In General, the higher the standard of living waste water volume and load the higher emissions. in many parts, and waste water disposal which are not returned to the water cycle. So the disease condition to spread and contaminate the environment. * Due to the use of chemical pesticides in agriculture, overuse cattle breeding activities: cattle urine, stool, untreated leftovers take on the environment and the agricultural production activity: pesticides and fertilizers from the rice, melons, orchards, vegetables contain toxic chemicals that can pollute groundwater and surface water. during agricultural production, the majority of farmers are using plant protection drugs three times recommended doses. Not the world, farmers still use both kinds of pesticides were banned as Aldrin, Thiodol, Monitor ... In the process of fertilizing, spraying anti-mosquito drugs, farmers do not clown fitted Workwear. currently the use of chemical fertilizers, plant protection chemicals spills in agriculture make the water sources are also affected. The amount of existing chemical residual will infuse down to the groundwater influence water quality. the majority of farmers don't have the store warehouse storage, smoking when buying parked are stored all over the place, including near the canteen, a well of living ... the majority of the shell the bottle after using finishing getting thrown right off the shore of paddy fields, the rest were middlemen to sell scrap ... * the wastes, waste water from industrial activities the speed of urbanization, industrialization and development increasingly pull in the industrial zone was established. Therefore the amount of waste due to the increasing industrial activity and not yet processed thoroughly exhaust directly into the environment or the river influence the water quality.
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