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The beginning of a new national standard for drinking water
Water pollution affects millions of people. Premier wen jiabao once proposed in the government report of the "two sessions" that "let the people drink water."In order to ensure the safety of drinking water, the new "drinking water hygiene standard" (gb5749-2006) (hereinafter referred to as the new national standard) will be formally implemented on July 1 this year.Compared with the old national standard, in terms of drinking water security, what are the new national standard strengthened and enhanced?What are the specific improvement requirements?What kind of promotion to industry development?To this end, China water network invited professor liu wenjun, director of the institute of drinking water safety and director of the disinfection research center of tsinghua university, to the studio to interpret the new national standards of drinking water.
The new national standards are basically in line with international standards
Liu wenjun said that compared with the 1985 version, the new national standard has three characteristics: first, it strengthens the requirements on organic matter, microorganisms and water disinfection;Second, we unified the standards for drinking water sanitation in urban and rural areas.Third, drinking water standards have basically been brought into line with international standards.
One of the big advances in the new national standards is the proposal that domestic water use should meet the standards so as not to endanger human health, which has been seriously ignored by people for a long time.The new national standards for the first time clearly put forward the definition of drinking water: drinking water and domestic water for People's Daily life.Domestic water (mainly is to take a bath, wash, wash water) through breathing and skin contact to affect human body health, there are data show that the human body through the skin contact material absorption of the water content of about 60% of the total amount of material in water, and the amount of absorbed by drinking is 20% or 30%, if the long-term exposure to unsafe water, there is a certain influence to the health of human body.
"New gb to formulate not only consider the long-term drinking and life people use may be the effects on the human body, also considers the due to the water quality of ShuPeiShui pipeline corrosion and impact factors to human body," wen-jun liu, in line with the new national standard of drinking water in drinking, through breathing and skin contact impact is safe to human body health.The overall goal is safety requirements, lifelong drinking will not cause significant harm to health.
Like "new" dislike "old" guarantee water quality safety
Comparing the old and new standards, liu wenjun introduced that compared with GB 5749-85, the water quality indexes were mainly changed from 35 items in GB 5749-85 to 106, an increase of 71 items.Eight items were revised, among which:
The number of microbial indicators increased from 2 to 6, adding two indicators (giardia giardia and cryptosporidium) for the first time.
Total coliform disinfectant for drinking water was revised from 1 item to 4 items, with the addition of chloramine, ozone and chlorine dioxide.
The number of inorganic compounds and organic compounds increased from 10 to 21 and 5 to 53.
Sensory properties and general physical and chemical indexes increased from 15 to 20.
In the new national standard, disinfectant has been increased from one item to four items. Regulations on disinfection with chloramine, chlorine dioxide and ozone have been added. Meanwhile, the upper limit of disinfectant residue has been set for the first time.
New national standard promotes water purification process improvement in water supply industry
'many people's good wish for quality drinking water is to turn on the tap and drink it,' Mr. Liu said.However, the fact that China's pipe network is generally obsolete is difficult to change in a short time, which is also a major constraint on water quality.Improving water quality is not only a social responsibility that enterprises must undertake, but also requires the country to increase investment in pipe network.In the release of a new national standard will promote the improvement of water quality, and further promote the water industry in our country the improvement of water purification process, but at the same time, it also to our network system and the water quality management put forward higher request, for the water supply industry in our country implement process, improve the water quality of water supply, is of great significance to ensure the safety of residents drinking water health
The new national standards are basically in line with international standards
Liu wenjun said that compared with the 1985 version, the new national standard has three characteristics: first, it strengthens the requirements on organic matter, microorganisms and water disinfection;Second, we unified the standards for drinking water sanitation in urban and rural areas.Third, drinking water standards have basically been brought into line with international standards.
One of the big advances in the new national standards is the proposal that domestic water use should meet the standards so as not to endanger human health, which has been seriously ignored by people for a long time.The new national standards for the first time clearly put forward the definition of drinking water: drinking water and domestic water for People's Daily life.Domestic water (mainly is to take a bath, wash, wash water) through breathing and skin contact to affect human body health, there are data show that the human body through the skin contact material absorption of the water content of about 60% of the total amount of material in water, and the amount of absorbed by drinking is 20% or 30%, if the long-term exposure to unsafe water, there is a certain influence to the health of human body.
"New gb to formulate not only consider the long-term drinking and life people use may be the effects on the human body, also considers the due to the water quality of ShuPeiShui pipeline corrosion and impact factors to human body," wen-jun liu, in line with the new national standard of drinking water in drinking, through breathing and skin contact impact is safe to human body health.The overall goal is safety requirements, lifelong drinking will not cause significant harm to health.
Like "new" dislike "old" guarantee water quality safety
Comparing the old and new standards, liu wenjun introduced that compared with GB 5749-85, the water quality indexes were mainly changed from 35 items in GB 5749-85 to 106, an increase of 71 items.Eight items were revised, among which:
The number of microbial indicators increased from 2 to 6, adding two indicators (giardia giardia and cryptosporidium) for the first time.
Total coliform disinfectant for drinking water was revised from 1 item to 4 items, with the addition of chloramine, ozone and chlorine dioxide.
The number of inorganic compounds and organic compounds increased from 10 to 21 and 5 to 53.
Sensory properties and general physical and chemical indexes increased from 15 to 20.
In the new national standard, disinfectant has been increased from one item to four items. Regulations on disinfection with chloramine, chlorine dioxide and ozone have been added. Meanwhile, the upper limit of disinfectant residue has been set for the first time.
New national standard promotes water purification process improvement in water supply industry
'many people's good wish for quality drinking water is to turn on the tap and drink it,' Mr. Liu said.However, the fact that China's pipe network is generally obsolete is difficult to change in a short time, which is also a major constraint on water quality.Improving water quality is not only a social responsibility that enterprises must undertake, but also requires the country to increase investment in pipe network.In the release of a new national standard will promote the improvement of water quality, and further promote the water industry in our country the improvement of water purification process, but at the same time, it also to our network system and the water quality management put forward higher request, for the water supply industry in our country implement process, improve the water quality of water supply, is of great significance to ensure the safety of residents drinking water health
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