Industrial wastewater is the main cause of water pollution caused by industrial pollution. It accounts for most of the pollutants discharged by industry. Due to different types of factories, the pollutants contained in industrial wastewater vary widely. Even in similar factories, the quality and quantity of pollutants are different due to different production processes. In addition to the direct injection of industrial wastewater into the water body, solid waste and waste gas will also pollute the water body. . . . . .
Agricultural pollution is firstly caused by loose surface caused by farming or land reclamation. When the soil and terrain are unstable, a large amount of sediment flows into the water, which increases the suspended solids in the water.
Another important reason is that the use of pesticides and fertilizers is increasing in recent years. Only a small amount of pesticides and fertilizers used are attached or absorbed, and most of the rest remain in the soil and float in the atmosphere. Through rainfall, they enter the surface water and infiltrate into the surface water to form pollution.
Urban pollution sources are water pollution caused by urban population concentration and urban domestic sewage, garbage and waste gas. The pollution of urban pollution sources to water bodies is mainly domestic sewage, which is a mixture of various kinds of sewage produced in people's daily life, including sewage discharged from kitchens, bathrooms and toilets.
In the world, the industrial and domestic wastewater discharged from urban areas alone is as much as 500 cubic kilometers every year, and each drop of sewage will cause several times or even dozens of times of pollution to the water body.
Measures taken for sewage mainly include:
1: financial, administrative and legal guarantee
(1) Financial support is indispensable.
Obviously, financial support is one of the important conditions for pollution control. Without funds, all control measures cannot be implemented.
(2) Government support is the backing.
Pollution control of urban water system involves a wide range, involving not only residents, but also the interests of outsiders, military systems, ethnic minorities and rights holders. Therefore, the water conservancy department alone can't solve the problem, and even if the environmental protection department is added, the strength is still weak. It needs the strong support of the municipal government, which also needs the support of the central government. Without strong government support, many compulsory measures will be difficult to be effective.
(3) Pollution control needs legal system.
Laws and regulations are the yardstick that people abide by. Local laws and regulations should be formulated to protect the urban water environment, so that the water system management department can follow the law and administer according to law, so that some things will be easier.