Quality of tap water in Hanoi capital

- Tin tức
Quality of tap water in Hanoi capital
Hanoi water supply system is managed by Hanoi Water Supply Trading Company. The Hanoi water supply system was built in 1894 under French colonial rule. Since then, after more than a century of operation, the system has been expanded and upgraded many times. CTKDN Hanoi, responsible for supplying water to 8 urban districts: Hoan Kiem, Dong Da, Hai Ba Trung, Ba Dinh, Cau Giay, Tay Ho, Thanh Xuan, Hoang Mai and 2 suburban districts are: Tu Liem, Thanh Tri.

Tap water in Hanoi

Hanoi water supply system is managed by Hanoi Water Supply Trading Company. The Hanoi water supply system was built in 1894 under French colonial rule. Since then, after more than a century of operation, the system has been expanded and upgraded many times. CTKDN Hanoi, responsible for supplying water to 8 urban districts: Hoan Kiem, Dong Da, Hai Ba Trung, Ba Dinh, Cau Giay, Tay Ho, Thanh Xuan, Hoang Mai and 2 suburban districts are: Tu Liem, Thanh Tri.

 

CTKDN Hanoi No. 2, responsible for water supply for Long Bien district and two suburban districts are: Gia Lam, Dong Anh. Hanoi Business Administration is responsible for producing and trading clean water in accordance with the regulations of Hanoi People's Committee. Although significantly improved, the water supply system in the South of Red River area is managed by CTKSNS Hanoi with a total exploitation capacity of more than 400,000 m3 / day. On the other hand, because the groundwater source in the south of Hanoi city has been polluted by domestic and industrial wastewater, the quality of treated water of water plants in the southern area of ​​Hanoi is as follows: Ha Dinh, Phap Van and Tuong Mai have not yet reached the standard of drinking water of the Ministry of Health, QCVN 01: 2009 / BYT.

 

Pollution of groundwater in Hanoi is now at a serious alarm level. Hanoi's smart water purifier has a low topography to the south and southeast, all surface water draws dirt here, infiltrating all the aquifers deep underground. In the southern and southeastern area of ​​Hanoi city, groundwater is heavily polluted. Ammonium content is higher than the permissible limit, typically wells of Phap Van water plant containing NH + 4 to 30mg / l. Currently there are not many assessments on heavy metal pollution in drinking water in Hanoi according to QCVN of drinking water. Heavy metals include Hg, Cd, Pb, As, Sb, Cr, Cu, Zn, Mn, etc.

 

Often not involved in or involved in the biochemical processes of living organisms and often accumulate in their bodies. Therefore, they are toxic elements with organisms in general and humans in particular. The main cause of heavy metal pollution is the process of pouring the environment of water, industrial waste water and toxic waste water without treatment or unsatisfactory treatment. The phenomenon of heavy metal pollution is common in water basins near industrial parks, large cities and mining areas. Heavy metal pollution manifests itself in high concentrations of heavy metals in water. Water pollution by heavy metals has a negative impact on the living environment of organisms and humans. Heavy metals accumulate according to the penetrating food chain and the human body. Contaminated surface water will spread pollutants groundwater, soil and other related environmental components. Assessments of heavy metal indicators in drinking water are important and direct to community life.

 

 Situation of heavy metals in drinking water in Hanoi Heavy metals in water samples in districts and towns in Hanoi City are analyzed and produced according to the following table: Water arsenic concentration ranges 0, 8 to 20.7 ppb. The value of Cadimi in water is mostly very small 0.2-0.8 ppb. Total chromium ranges between 13-21 ppb. For Dong, this value is 4 to 24 ppb. The concentration of iron is higher than that of other metals several tens to several hundred ppb. Mangan concentration is also quite high in Hoang Mai district with a value of 234ppb. Molybdenum is often undetectable in water samples. Nickel ​​fluctuate above 10ppb for all analysis areas. For Lead, most locations are below 10 ppb, but only Hoang Mai district is worth more than 30ppb. Selenium is mostly non-analytical or very small. Zinc concentration is also quite high in the country, some places are up to 2623ppb.

 

 

Results of heavy metal analysis in tap water in districts and districts in Hanoi

 

2.2. Evaluation of tap water quality in accordance with drinking water quality standards Based on the results of dissemination and comparison with QCVN 01: 2009 / BYT on drinking water, the majority of domestic metals are at the level of elimination of arsenic and Lead at some point is not up to standard. Arsenic exceeds the standard at 3 points: Hoan Kiem, Dong Da 2 and Hoang Mai, notably in Hoang Mai district, arsenic content is more than double the permitted standard. Lead content exceeds the limit of 3 times allowed in drinking water at the sampling point in Hoang Mai district. Heavy metal concentrations (ppb)

 

 

2.3. The ability to filter heavy metals in drinking water by reverse osmosis water core. Water samples contaminated with heavy metals such as arsenic and lead in Hoang Mai district are filtered through RO reverse osmosis filter core. The analytical results show that most arsenic in this water sample is separated. For lead-contaminated water at concentration 31ppb after filtering the concentration of lead in the country, only 1.5ppb remains. With the results obtained, drinking water standards have met the drinking water standards set by the Ministry of Health.

 

Results of separation by RO reverse osmosis filter for water contaminated with heavy metals in Hoang Mai-Hanoi district. Unit of calculation ppb

 

In general, the preliminary assessment results show that the quality of tap water samples in Hanoi area is satisfactory according to QCVN about domestic water, but there are some water samples in some districts that are not satisfactory. demand for Arsenic and Lead, Amoni. this result, it is recommended that water supply companies should strictly check the quality of feed water to ensure safety and hygiene. People need to have plans to protect the absolute safety of drinking water, especially the water source for eating needs, in which the solution with RO is really safe - effective - economical.


0.08418 sec| 1850.5 kb