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Original title: Tap water precipitation overnight drink more assured?
morning tap water color white, is added bleach powder? Tap water with chlorine, more precipitation for a period of time to use better? Home water purifier has been used for 3 years, there is a purification effect? . . . these questions have been encountered by many members of the public in their lives, but the truth may not be what you think. Yesterday, "World Water Day" came, the reporter came to Chongqing Water Company Shaping Dam water plant to interview water workers, to everyone to answer questions.
Shaping Dam water plant is older than many citizens, it is founded in 1945 Hanyu Road water plant and was founded in 1958 Gaojia Garden Water Plant two independent water supply system, is a comprehensive design of the daily water supply capacity of 250,000 cubic meters of medium-sized water production enterprises, factory water quality comprehensive pass rate of 100%, water supply indicators better than the national "living drinking water hygiene standards."
The water pick-up port of shaping dam water plant, located at the bottom of the river heart 200 meters upstream of Gaojia Garden Bridge, the water plant installed two 1.2-meter diameter water pipes at the bottom of the river, using gravity self-retention method to collect water, and then pump pressure to the water plant treatment.
it is well known that raw water extracted from rivers cannot be consumed directly. It is not only cloudy, but also with sediment, floating objects, etc. , the waterworks do the work, is to turn these river water into clean, clear and drinkable tap water.
After the raw water enters the water plant, it needs to go through the water distribution, pre-chlorine, pre-sinking, drug delivery, V-type filter filter and other related processes, and then enter the water plant water tank, chlorine disinfection, in order to become qualified tap water.
in order to better monitor water quality, there are also ecological fish observation points in waterworks. This is not the leisure of the tap water staff, but after the first precipitation of the water, rely on these fish to assist in testing whether the water quality is qualified. If fish have health problems, then the waterworks will have to go back to the roots and look for water quality problems.
the national urban water quality monitoring network Chongqing monitoring station staff, chlorine disinfection is currently the world's use of more, the longest use of time, the most experienced way of disinfection of tap water, high efficiency, good results. In order to ensure that the tap water in the water supply network still has the effect of killing and suppressing pathogenic microorganisms, there must be a certain amount of free residual chlorine in the water. Therefore, the national "living drinking water hygiene standards" (GB5749-2006) stipulates: water plant residual chlorine standard is 0.3 to 4 mg / liter. At present, Shaping Dam water plant factory residual chlorine control at 0.7 mg / liter, higher than the national minimum standards. At the same time, in order to ensure factory water quality, Shaping Dam water plant on raw water, factory water are set up turbidity meter, residual chlorine instrument, PH instrument and other online monitoring instruments, 24 hours on the water quality real-time monitoring. At the same time, the indicators of tap water will be analyzed regularly to ensure the safety of water for the public.
these water "common sense" are wrong
water is the source of life, but also the common people often involved in the topic. In view of the public's concern about the water-related issues, Shaping Dam water plant plumber Manlong to everyone to carry out science.
1: Is the color of the tap water white in the morning, with bleach?
: Chongqing Water Company as early as many years ago did not add bleach to the tap water, the naked eye can be seen white, in fact, the tap water mixed with air caused.
2: Because tap water is chlorine-added, more precipitation for a period of time to use better?
: By the end of the water supply, the amount of chlorine in the tap water accessed by the public is already very low. Some citizens like to precipitate tap water overnight and use it the next day. However, this may lead to secondary pollution, it is recommended that the public use tap water without precipitation, can be used directly.
3: My family bought a few thousand yuan water purifier, used for 3 years, purified tap water to drink more at ease.
: Chongqing Water Company's factory water is higher than the national standard, do not use water purifiers, but also can be used safely. For example, the vast majority of waterworks employees do not use water purifiers in their homes. It should be reminded that the water purifier filter element needs to be replaced regularly, usually manufacturers will prompt a replacement time, recommended that the public replace before that time. Using a three-year filter can deposit large amounts of bacteria, and this "purification" is instead a form of contamination.
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