The current situation of water pollution in China, and what will be the impact of the worrying statu

Human beings are facing the severe challenge of water pollution, among which domestic sewage is a major water pollution, this paper makes a brief analysis of the prevention and control of urban domestic sewage in China, and on this basis, puts forward the principles and methods that can be followed in the prevention and control of urban domestic sewage.

1. Overview of urban domestic sewage.

Among all the natural elements that sustain human existence, economic construction and social development, the importance of water cannot be overstated. However, with the acceleration of industrialization and urbanization, the world is facing the challenges of water shortage and serious pollution.

China is particularly serious, is one of the world's 13 water shortage countries, more than 600 cities in the country is currently about half of the city water shortage, the deterioration of water pollution has made the water shortage worse: China's rivers and lakes are generally polluted, 75% of the country's lakes have varying degrees of eutrophication; 90% of urban waters are seriously polluted, and 60%-70% of the total water shortage in southern cities is caused by water pollution; According to the groundwater survey of 118 large and medium-sized cities in China, 115 cities have been polluted, of which about 40% are severely polluted. Water pollution reduces the use function of water bodies, aggravates the shortage of water resources, and has a negative impact on the implementation of China's sustainable development strategy.

China's water pollution mainly comes from two aspects, one is the excessive discharge of industrial wastewater in industrial development, and the other is the serious lack of urban sewage discharge and centralized treatment facilities in urbanization, and a large amount of domestic sewage directly enters the water body without treatment, causing environmental pollution. Although industrial wastewater has been reduced in recent years, urban domestic sewage has increased unabated, accounting for more than 51% of water pollution. According to the monitoring of the environmental department, in 1999, nearly 80 percent of the country's domestic sewage went directly into rivers, lakes and seas without treatment, and the annual sewage discharge reached 40 billion cubic meters, causing more than one-third of the country's water areas to be polluted.

It is very serious, mainly because the sewage treatment technology is not developed enough.

With the development of industry and the continuous expansion of the population, China is facing a very severe water pollution situation, and the water quality in some areas has even continued to deteriorate.

1. The eutrophication level of lakes in China has been reached, and the area of lake reservoirs in eutrophication and mesotrophic states accounts for the total area of lake reservoirs. Environmental monitoring showed that the eutrophication degree of large freshwater lakes was further aggravated.

The main pollutants are total phosphorus and total nitrogen. The western half of Chaohu Lake and Dianchi Lake are heavily polluted. The permanganate index of Taihu Lake is high, and the pollution of the river channel into the lake is heavy.

Sudden accidents occur from time to time in Hongze Lake.

2. According to the statistics of the seven major water widths and 110 key river sections of inland rivers in the country, 32% of them meet the "Quality Standards for Surface Water Environment", 29% of them meet the "Quality Standards for Surface Water Environment", and 39% of them belong to the category. The main pollution indicators were ammonia nitrogen, permanganate index, volatile phenols and biochemical oxygen demand. The downstream sections of large and medium-sized cities are generally polluted by coliform bacteria.

3. In recent years, the inorganic ammonia and inorganic phosphorus in the coastal sea areas have generally exceeded the standard, the pollution degree has increased, the nutrient content of local sea areas has exceeded the national water quality standard of Class 3, and the oil pollution has been reduced, but the pollution in the Pearl River Estuary, Dalian Bay, Jiaozhou and other sea areas is still serious. The frequency and area of red tides in China's coastal waters have increased.

Water pollution, also known as water pollution, is water that pollutes the environment by reducing or losing the 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.

After the dissolved oxygen in the water is exhausted, the organic matter is decomposed by the oxidation, producing hydrogen sulfide, mercaptan and other unpleasant gases, which further deteriorates the water quality, and various pollutants enter the water body, and its quantity exceeds the self-purification capacity of the water body.

Water pollution refers to the phenomenon that the chemical, physical, biological or radioactive characteristics of the water body are changed due to the intervention of a certain substance, thereby affecting the effective use of water, endangering human health or destroying the ecological environment, and causing the deterioration of water quality.

In short, the phenomenon of water quality change and deterioration of water quality under the influence of human activities is collectively referred to as water pollution. Regardless of whether it affects the degree of use, as long as Mu Danmin occurs, it is pollution.

Industrial wastewater is an important source of pollution in waters, which has the characteristics of large quantity, wide area, complex composition, difficult to purify, and difficult to treat. Agricultural sources of pollution include livestock manure, pesticides, fertilizers, etc. In pesticide sewage, one is high in organic matter, plant nutrients and pathogenic microorganisms, and the other is high in pesticides and fertilizers.

The main sources of domestic pollution are all kinds of detergents and sewage, garbage, feces, etc. used in urban life, most of which are non-toxic inorganic salts, and domestic sewage contains more nitrogen, phosphorus, sulfur, and more pathogenic bacteria. Water pollution is mainly caused by the pollutants caused by human activities, which includes three major parts: industrial pollution sources, agricultural pollution sources and domestic pollution sources.

Water pollution refers to the phenomenon that there are harmful substances or excessively high concentrations of substances in the water body, which have a negative impact on the water environment and ecosystem. Here are some important observations and questions about the current state of water pollution:

1.Water resources are under threat: Many parts of the globe are experiencing water scarcity and deteriorating water quality. The development of industry, agriculture and urbanization has led to the discharge of large amounts of wastewater and the pollution of water bodies, resulting in clean water available for human use or a reduction in resources.

These sources release harmful substances such as heavy metals, chemicals, organic pollutants and nutrients that seriously disrupt the balance of the aquatic ecosystem.

3.Ecosystem damage: Water pollution has a serious impact on the biodiversity and stability of aquatic ecosystems.

The discharge of pollutants disrupts the oxygen balance in the water, leading to the death of aquatic life and the loss of habitat. Some water pollution has also led to the occurrence of phenomena such as cyanobacterial blooms and dead zones in the ocean, further exacerbating the collapse of ecosystems.

4.Increased health risks: Bisiwood water pollution poses a serious threat to human health.

Contaminated water sources can contain bacteria, viruses, toxic chemicals, and heavy metals, which can lead to waterborne diseases and chronic health problems such as diarrhea, liver damage, cancer, etc., if ingested directly or indirectly by humans.

5.The importance of international cooperation: Water pollution is a global problem that needs international cooperation to solve.

States**, international organizations and social groups should strengthen cooperation in formulating and implementing water resources management policies, strengthening monitoring and governance capabilities, and promoting technological innovation and information sharing to reduce the occurrence of water pollution and its impact on the environment.

In the face of the current situation of water pollution, measures such as reducing pollution sources, strengthening water resource management, and improving treatment technology and awareness are all crucial. Healthy <> to protect and restore the water environment

Water pollution stems from many human activities. Industrial contaminants can flow out of the plant's drain pipes, or they can flow out of pipes and underground storage cabinets. Contaminated water may also flow from mines, flow through mines through mineral-bearing rocks, or have been contaminated with processing ore chemicals that contain trace amounts of household chemicals.

Most water pollution in cities and other residential areas comes from trace amounts of household chemicals mixed in sewers. Sometimes, factories discharge pollutants into the city's sewage system, increasing the number of pollutants in the city. Pollutants from agricultural sources such as farmland, pastures, livestock farms, and large farms include animal manure, agricultural chemicals, and sediments from corrosion processes.

Pollutants flow into the sea. Pollutants flow into the sea from nearby coastlines, ships, and offshore oil platforms. Sewage and waste discharged by ships sailing on the high seas do not pose a hazard to birds or marine animals, but plastic discarded on deck can entangle animals and kill them.

If swallowed, it can also cause these animals to suffocate, block their digestive tracts, and even die. Oil spills tend to occur within 25 years due to accidents, such as the 1992 wreck of the USS Exxonwaldez off the coast of Alaska. Daily and deliberate pours can also spill into the ocean.

Oil spills can also occur in the ocean. The world's largest oil spill has its roots in war. During the 1991 Gulf War, Iraqi forces destroyed eight ships and land terminals in Kuwait, leaking a record amount of 100 million litres (100 million gallons)**.

The first spike** deprives the feathers and fur of birds and marine mammals of their natural ability to repel water, causing animals to drown or freeze to death. In addition, these animals can become sick or poisoned when swallowed**. Water pollution can also be caused by other types of pollution.

For example, sulphur dioxide from power stations pollutes the air first, and the polluted air mixes with moisture to produce sulphuric acid suspensions, which fall to the surface and become acid rain. Acid rain can then flow into streams or lakes, becoming water pollution that threatens or even destroys wildlife. Similarly, landfills can also cause water pollution if rainwater that has been filtered through the garbage absorbs toxins before soaking into the soil, contaminating groundwater sources.

Contaminants can encounter natural water sources where we can find them. The site is known as a designated source of pollution, such as a sewage drain. It is difficult to find the pollution source of Yinhao at random points.

Most of the agricultural pollution is classified as non-fixed-point pollution.

Summary. Dear, I'm glad to answer your <>

The causes of water pollution in China are mainly caused by pollutants produced by human activities, which include three major parts: industrial pollution sources, agricultural pollution sources and domestic pollution sources. Among the water pollution caused by human production activities, the water pollution caused by industry is the most serious. Such as:

Industrial wastewater, which contains many pollutants and complex compositions, is not only difficult to purify in water, but also difficult to treat<>

Causes of water pollution in our country.

Dear, I'm glad to answer your <>

The causes of water pollution in China are mainly caused by pollutants produced by human activities, which include three major parts: industrial pollution sources, agricultural pollution sources and domestic pollution sources. Among the water pollution caused by human production activities, the water pollution caused by industry is the most serious. Such as:

Industrial wastewater, which contains many pollutants and complex compositions, is not only difficult to purify in water, but also difficult to treat<>

Kinqin expansion: Water pollution refers to the change of chemical, physical, biological or radioactive characteristics of the water body due to the intervention of a certain substance, which affects the effective use of water, endangers human health or destroys the production environment, and causes the deterioration of water quality, which must be prevented. Water pollution refers to the amount of pollutants discharged into the water body that exceeds the background content and self-purification <>capacity of the substance in the water body