At present, water pollution mainly includes what are the main sources of water pollution

1.Pathogen pollution: domestic sewage, hospital sewage, livestock and poultry farm sewage, etc., often contain pathogens, such as viruses, germs and parasites.

If this type of sewage is not properly purified, it will pass through various channels and cause dysentery, typhoid, infectious hepatitis and schistosomiasis.

2.Aerobic pollutants: domestic water, paper and food industry effluents contain organic matter such as proteins, oils, carbohydrates, lignin, etc.

After such substances enter the water body with the sewage, in the process of microbial decomposition of them, the dissolved oxygen in the water body needs to be consumed, so that the oxygen content of the water body is reduced, thereby affecting the growth and reproduction of fish and other organisms. When the dissolved oxygen in the water is exhausted, the organic matter in the water will produce anaerobic digestion to produce methane, hydrogen sulfide, etc., which will make the water body smell and endanger the survival of aquatic organisms.

3.Plant nutrient pollutants: industrial sewage and domestic sewage such as papermaking, leather, food, oil refining, synthetic detergents, and farmland water with phosphate fertilizer and nitrogen fertilizer contain nutrients such as nitrogen, phosphorus, and potassium.

This type of substance is mostly red in color and is called "red tide organisms". The proliferation of red tide organisms can cover the surface of the water and attach to the ribs of squids, making it difficult for them to breathe. Dead red tide organisms are broken down by microorganisms, consuming dissolved oxygen from the water.

Some red tide organisms and their substitutes contain biotoxins, which often cause fish and shellfish poisoning and death, and can pass through the food chain and endanger human health.

4.Petroleum pollutants: Mostly occur in the ocean, mainly from accident spills from oil tankers, subsea oil production, ballast water from oil tankers, and wastewater from onshore refineries and biochemical plants.

5.Highly toxic pollutants: mainly heavy metals, cyanide, fluoride and difficult to decompose organic pollutants, most of them come from mines, smelting wastewater, they are enriched in living organisms, through the food chain, endangering human health.

In addition, there is also radioactive contamination of water bodies, which is caused by radioactive materials entering water bodies. Salt pollution, various acid, alkali and salt inorganic compounds enter the water body, which increases the salt content of fresh water and affects the water quality. Thermal pollution, cooling water from power stations, etc. is the main source of thermal pollution, and a large amount of hot water is discharged into the water body, which increases the water temperature and reduces the dissolved oxygen in the water body, affecting the survival and reproduction of fish.

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Industrial wastewater, domestic sewage, agricultural sewage, industrial and mine waste residue, atmospheric pollutants, natural pollutants, etc.

1. Wastewater: The direct discharge of untreated industrial wastewater is an important source of pollution in the water body, which has the characteristics of large quantity, wide area, complex composition, high toxicity, difficult to purify, and difficult to treat. Industrial wastewater is most commonly found in the chemical industry, paper industry, food processing industry, metal products industry, iron and steel industry, leather printing and dyeing industry.

Every year, about 1 3 of China's industrial wastewater is directly discharged into the water area without treatment, and the illegal illegal discharge is very serious.

2. Domestic sewage: mainly all kinds of detergents and sewage, garbage, feces, etc. used in urban life, domestic sewage contains more nitrogen, phosphorus, sulfur, organic fiber, starch, sugar, fat, protein, urea, pathogenic bacteria, etc. Every year, more than 90% of China's domestic sewage is directly discharged into the water without treatment.

3. Agricultural sewage: including livestock manure, pesticides, fertilizers, etc. In agricultural sewage, first, the content of organic matter, plant nutrients and pathogenic microorganisms is high; Second, the content of pesticides and fertilizers is high.

According to relevant data, 110.49 million tons of pesticides are used every year on 100 million hectares of arable land and 2.2 million hectares of grassland.

4. Mine waste slag: The waste slag mined by the mine is washed by rainwater and pollutes the river, soil and groundwater. In particular, the slag of rare metal and heavy metal mining plants is washed by rainwater to make the heavy metal content in the water exceed the standard.

5. Air pollutants: Air pollutants can fall into rivers, lakes and seas to pollute water bodies through the sedimentation of rainwater.

pollution of human and animal excrement, decaying plants, sewage and garbage; (2) Industrial pollution: pollution of wastewater discharged from factories, mines, automobiles and ships; (3) Food contamination: pollution of pesticides, fertilizers, hormones, etc. in agriculture, forestry, animal husbandry, by-products, and fisheries; (4) Technological pollution:

pollution from household appliances, communication equipment, nuclear industry and other high-tech industries; (5) Secondary pollution: After chlorination in the water treatment process, the carcinogen chloroform in the water seriously exceeds the standard; After a long cast iron and galvanized pipe, the heavy metals are seriously exceeded; The water tank entering the high-rise building has been unmaintained for a long time, and the amount of dirt has increased, resulting in serious exceedance of various pollutants. Water pollution is becoming more and more serious, and human health is seriously threatened.

In the face of serious pollution of drinking water, we should cherish water resources and pay attention to the health of drinking water!

Legal basis: "Law of the People's Republic of China on the Prevention and Control of Water Pollution" Article 3: The prevention and control of water pollution shall adhere to the principles of prevention first, prevention and treatment combined, and comprehensive treatment, giving priority to the protection of drinking water sources, strictly controlling industrial pollution and urban life pollution, preventing and controlling agricultural non-point source pollution, actively promoting the construction of ecological treatment projects, and preventing, controlling, and reducing water environmental pollution and ecological damage.

The main causes of water pollution are twofold:

1: Natural pollution. It is due to the change of natural laws and the pollution of water sources by minerals in the soil.

2: Anthropogenic pollution. It is the pollution caused by human life and production activities, and the water pollution generally refers to man-made pollution. It includes industrial wastewater pollution, agricultural pollution, domestic sewage pollution, and water pollution caused by municipal solid waste.

Increasing water pollution has posed a major threat to human survival and security, and has become a major obstacle to human health, economic and social development. According to the world's authoritative survey, in developing countries, 80% of all kinds of diseases are transmitted by drinking unhygienic water, and drinking unsanitary water causes at least 20 million deaths worldwide every year, so water pollution is called"The number one killer in the world"。

Water pollution affects industrial production, increases equipment corrosion, affects product quality, and even makes production impossible. Water pollution also affects people's lives, destroys the ecology, and directly endangers people's health, causing great damage.

Water pollution is water that pollutes the environment by reducing or losing the use value of water caused by harmful chemicals. Acids, alkalis, oxidants, as well as compounds such as copper, cadmium, mercury, arsenic, benzene, dichloroethane, ethylene glycol and other organic poisons in sewage will poison aquatic organisms and affect drinking water sources and scenic landscapes. When the organic matter in the sewage is decomposed by microorganisms, the oxygen in the water is consumed, affecting the life of aquatic organisms, and after the dissolved oxygen in the water is exhausted, the organic matter is anaerobic decomposed, producing unpleasant gases such as hydrogen sulfide and mercaptan, which further deteriorates the water quality.

Environmental pollution is divided into: industrial environmental pollution, urban environmental pollution, agricultural environmental pollution, and marine pollution. Among them, the environment refers to the totality of various natural and artificially modified natural factors that affect the survival and development of human beings.

Article 67 of the Water Pollution Prevention and Control Law.

It is forbidden to build or expand construction projects that seriously pollute water bodies in quasi-protection zones for drinking water sources; Reconstruction and construction of several projects shall not increase the amount of pollutant discharge. These include:

1. It is forbidden to build, reconstruct or expand projects for the production of potatoes such as printing and dyeing, papermaking, tanning, electroplating, chemical industry, smelting, oil refining, brewing, chemical fertilizer, dye, and pesticides, or to discharge projects and facilities containing a class of pollutants stipulated by the state.

2. It is forbidden to set up warehouses or stacks of highly toxic substances.

3. It is forbidden to set up industrial wastes and other wastes and processing plants that pollute drinking water sources.

4. It is forbidden to stack, landfill and dump hazardous waste.

5. It is forbidden to raise pigs, cattle, sheep and other domestic animals.

6. It is forbidden to destroy forests for land reclamation and to plant fruits by destroying forests.

7. It is forbidden to build, reconstruct or expand quarries, clay and brick factories in the protected area.

Arbitrary discharge of wastewater in industrial production, domestic sewage, and farmland sewage caused by the large use of chemical fertilizers, pesticides, and herbicides in agricultural production.

Wastewater is classified differently from different perspectives. According to different **, it is divided into two categories: domestic wastewater and industrial wastewater; According to the chemical category of pollutants, it can be divided into inorganic wastewater and organic wastewater; There are also classified according to the industrial sector or the production process that produces wastewater, such as coking wastewater, metallurgical wastewater, pharmaceutical wastewater, food wastewater, etc.

The main pollutants are: untreated industrial wastewater; untreated domestic sewage; farmland sewage caused by the massive use of chemical fertilizers, pesticides, and herbicides; industrial waste and household waste piled up near the river; deforestation, soil erosion; Mine effluent is produced due to over-exploitation.

The main sources of water pollution include industry, agriculture, urban bridges, old sewage, etc., excluding natural factors and non-point source pollution.

The main sources of water pollution include industry, agriculture, and urban sewage. Industrial discharge is an important cause of water pollution, and wastewater containing harmful substances such as heavy metals and organic compounds will be produced in the industrial production process. Agricultural activities can also cause water pollution, pesticides, fertilizers, livestock and poultry manure will become the main factors of water pollution.

Municipal sewage is one of the main polluted water bodies, and untreated urban sewage contains high concentrations of nutrients and microorganisms. The causes of water pollution do not include natural factors, such as pollutants, sediments, algae, etc., as well as non-point source pollution, such as harmful substances lost from rainwater washing roads, farmland, mountains and other surfaces.

How to prevent the impact of industrial pollution on water bodies? The main measures to prevent the impact of industrial pollution on water bodies include: strengthening pollution prevention and control in the process of industrial production, improving sewage discharge standards and relevant laws and regulations, and strengthening supervision and law enforcement.

In addition, advanced technologies such as ecological industry and cleaner production should be actively promoted to reduce the generation of industrial wastewater.

Water is the source of life, and the harm caused by water pollution to human health and the ecological environment cannot be ignored. Therefore, it is necessary for enterprises, enterprises and the public to work together to take effective measures to ensure the safety of water quality and protect the sustainable use of water resources.

Legal basis]:

Article 6 of the Water Pollution Prevention and Control Law of the People's Republic of China prohibits the discharge of seriously harmful pollutants into specific areas such as underground water sources, drinking water sources, and nature reserves.

Industrial wastewater, agricultural wastewater, domestic sewage, commercial sewage, surface runoff, etc

Category I: Industrial wastewater.

Industrial wastewater is effluent from the manufacture of mining and industrial production activities, including runoff live leachate from industrial or commercial storage and processing, and other wastewater that is not domestic sewage. It is the most important cause of water pollution caused by industrial pollution. It accounts for the majority of pollutants emitted by industry.

The pollutants contained in industrial wastewater vary greatly depending on the type of plant, and even the quality and quantity of pollutants contained in similar factories with different production processes are different. In addition to the direct injection of wastewater into water bodies to cause pollution, solid waste and exhaust gases can also pollute water bodies.

Category 2: Agricultural sewage.

Agricultural pollution is first caused by the loosening of the land surface by farming or land reclamation, and when the soil and topography are not stable, a large amount of sediment flows into the water, increasing the suspended solids in the water.

Another important reason is the increasing use of pesticides and fertilizers, and 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.

The third category: domestic sewage.

Sewage from residential buildings, office buildings, institutions or similar sources; sanitary sewage; Sewer effluent, including industrial effluent mixed with domestic effluent in sewer systems. The source of urban pollution is caused by the concentration of urban population, and the pollution of water bodies caused by urban domestic sewage, garbage and exhaust gas. The pollution of water bodies by urban pollution sources is mainly domestic sewage, which is a mixture of various types of sewage produced in people's daily life, including the sewage discharged from kitchens, washing rooms, bathrooms and toilets.

In the world, as many as 500 cubic kilometers of industrial and domestic wastewater are discharged from urban areas alone in a year, and each drop of sewage will pollute water bodies several times or even dozens of times.

Category 4: Commercial sewage.

Non-toxic, non-hazardous effluent from commercial facilities with some components exceeding domestic sewage. Such as catering sewage. Laundry sewage, animal feeding sewage, hair salon sewage, etc.

The first side talks about the five categories of beams: surface runoff.

Surface runoff from rain, snow, highway launches, water from urban and industrial areas, etc., does not seep into the soil and enters groundwater along streets and land.

Among the water pollution caused by human production activities, the water pollution caused by industry is the most serious. For example, industrial wastewater contains many pollutants and complex compositions, which is not only difficult to purify in water, but also difficult to treat. Therefore, it is particularly important to discharge water after the water quality test meets the standard.

Article 1 of the Law of the People's Republic of China on the Prevention and Control of Water Pollution is formulated for the purpose of preventing and controlling water pollution, protecting and improving the environment, ensuring the safety of drinking water, and promoting comprehensive, coordinated and sustainable economic and social development. Article 3: The prevention and control of water pollution shall adhere to the principles of giving priority to prevention, combining prevention and treatment, and comprehensive treatment, giving priority to the protection of drinking water sources, strictly controlling industrial pollution and urban life pollution, preventing and controlling agricultural non-point source pollution, actively promoting the construction of ecological control projects, and preventing, controlling, and reducing water environmental pollution and ecological damage.