The pollution of domestic water in Beijing is mainly reflected in the use of tap water pipes and high-level water tanks in residential areas (usually high-rise buildings living in cities do not drink tap water directly, but extract tap water stored in the water tanks of buildings).
Main causes of tap water pollution:
1。 The pipes used for building houses are of poor quality and easy to rust, which affects the water quality;
2。 There is a leak in the water supply network, which will produce negative pressure when the water is stopped, and pollutants will enter the pipeline;
3。 Open pollution caused by uncivilized operation during pipeline contact construction or maintenance in the pipe network area;
4。 Some users use water storage equipment for their own use (including spare water tanks, water heaters, toilet water tanks, etc.). ) there is no strict switching to prevent backwater, which makes the standby water and tap water cross-polluted;
5。 Individual users, especially large commercial water users, illegally modify pipelines, connecting water supply pipelines with other pipe networks, causing system pollution.
Relevant data show that more than 80% of the drinking water in the secondary water supply tank of high-rise buildings in China does not meet the drinking water standard, and Escherichia coli, ammonia nitrogen and nitrite obviously exceed the standard. China Health Information once reported: "The most worrying thing is that the water storage tanks of high-rise buildings have not been properly managed and cleaned in time, which is a headache for almost every city, especially the high temperature in summer. It has become a breeding ground for bacteria, mosquitoes and flies, and some water can actually release live red worms! Some mice in the water tank are bigger than cats. "
Maybe everyone will think: why can't residents continue to drink tap water (or groundwater) after drinking it for decades? this is because
With the progress of science and technology and the rapid development of industry and agriculture, the pollution of the earth is becoming more and more serious, and the naturally purified groundwater no longer exists, which is not suitable for direct drinking. At present, the common pollution sources of groundwater are:
1. Industrial wastewater and other industrial wastes
2. Agricultural pesticides and fertilizers seep into the ground with irrigation water;
3. Domestic sewage, septic tanks and drainage facilities;
4. Other pollutants seep into rivers and lakes;
5. Landfill and leakage of other pollutants;
6. Seawater intrusion.
Due to water pollution, sewage has become a hidden killer of human health. A survey by the World Health Organization (WHO) shows that:
80% of diseases in the world are caused by drinking polluted water;
50% of children in the world die because of drinking polluted water;
There are 654.38+0.2 billion people in the world who suffer from various diseases because of drinking polluted water.
Every year, 25 million children in the world die of diseases caused by drinking polluted water;
The number of infectious diseases such as cholera, dysentery and malaria caused by water pollution in the world exceeds 5 million.
The main diseases caused by water pollution are:
1. Cancer: Cancer scientific research has found that cancer is a long-term accumulation of harmful substances in body fluids inside and outside human cells, which causes damage to cells and tissues, thus causing acute deterioration; The spread of cancer cells is also carried out through cell body fluids, and other diseases and inflammations are also caused by harmful substances in intracellular water;
2. Stones: The function of the human liver is to decompose various nutrients into nutrients necessary for the human body, which are transported from the blood to the heart, and then from the heart to the internal organs and 60 trillion cells through blood vessels. The kidney is a filter net, and the blood flowing back from various parts of the body is mixed with a lot of waste and impurities, which are filtered by the kidney and discharged from the urethra. At this time, some impurities tend to accumulate in the body, which will cause various lithiasis over time.
3. Cardiovascular and cerebrovascular sclerosis: Drinking unclean water for a long time will precipitate some pollutants on the blood vessel wall and accelerate cardiovascular and cerebrovascular sclerosis. Hypertension, heart disease, cerebral thrombosis and other diseases are directly related to drinking unclean water for a long time.
4. Fluorosis: Drinking high-fluorine water for a long time can lead to poisoning. Excessive intake of "fluorine" in bones will replace calcium in bones, leading to loosening and softening of human bones, making people hunched over and even losing their ability to work. Before the age of 7-8, children's teeth lose their luster, turn black and fall off, and once they are formed, they will never retreat.
5, digestive system diseases, such as:
Escherichia coli-gastroenteritis, diarrhea, urinary tract infection, cholecystitis, etc.
Salmonella-typhoid, paratyphoid, etc. ;
Shigella-bacillary dysentery and other diseases;
Hemolytic streptococcus-hemolytic jaundice;
6. Diseases caused by excessive heavy metals, such as:
Lead nephropathy, neuralgia, leprosy, etc.
Arsenic-neuritis, acute poisoning and even death
Cadmium-bone deformation, low back pain, poisoning, polycythemia, etc. ;
Phosphorus-organophosphorus poisoning, dyspnea, etc. ;
Calcium calculus, gout, etc. ;
Mercury-neurotoxicity, mental disorder, madness, spasm and even death;
Chromium-chronic renal poisoning, causing renal dysfunction, cancer, etc.
7. Other diseases,
Such as: halogenated substances such as chloroform and fluorescent substances-carcinogenic;
Radioactive foreign bodies-change human genes and cause corresponding diseases;
Insecticide, chemical fertilizer, herbicide, nitrite toxin accumulation, toxic hepatitis, hepatitis, nephritis, urinary system diseases, etc.
The water in human body is updated every 5 ~ 13 days. If 70% of the water in the human body is clean, then the cells in the human body will have a healthy and fresh environment. Healthy and clean water can enhance human immunity and promote cell metabolism, so cells in the body will lose the conditions for malignant transformation and toxin diffusion. The chances of people getting sick will naturally decrease. Experts warned us that while paying attention to medical treatment, we should also pay attention to the continuous supply of good water to replenish cells and strive to create a fresh and healthy living environment for cells.