How far is it to “unscrew the tap”?

2024-06-13 15:06:22
Background: The mandatory national standard (hereinafter referred to as the new standard) of the Sanitary Standard for Drinking Water (GB5749-2006) jointly issued by the National Standards Committee and the Ministry of Health was officially implemented on July 1, 2007. This is the first time in 21 years to amend the "Sanitary Standard for Drinking Water" issued in 1985, which has significantly increased the number of indicators from the original national standard of 35 to 106. If all tap water that meets the standards is tested according to the new standard, it will be directly drinkable.
Drinking water is a basic need for life for the people, and its importance is self-evident. What is the current status of drinking water in Deyang?
It is difficult to set the "buffer period" for all the standards.
Tang Xiaoping, director of the Water Supply Company Laboratory, said that due to equipment restrictions, the company can only conduct more than 40 tests, including 42 general indicators and several unconventional indicators in the new standard.
In order to cope with the new standards, the city water supply company is currently commissioning a series of equipment, including gas chromatography, liquid chromatography, ion chromatography, atomic fluorescence spectrophotometer, atomic absorption spectrophotometer, alpha, beta radioactivity analyzer, oil detector And other large instruments. After the commissioning is completed, its testing equipment has been in a leading position in Sichuan. The company will immediately begin to conduct operational skills training for its employees.
Tang Xiaoping said frankly that the water supply enterprises that can complete the 106 indicators tested by the new standards are counted in the country. Some equipments that complete an indicator test cost millions, and if they complete the equipment, there are tens of millions of funding gaps. At the end of June, the provincial construction department, the health department and other departments held a meeting in Chengdu, requiring all localities to increase testing items as much as possible. The meeting made it clear that 42 routine indicators will be implemented from July 1 and 64 non-conventional indicators. The situation will be determined by the provincial people's government according to the local conditions, but at the latest, depending on the local conditions. Must be implemented in 2012.
Compared with the old standard, the new standard has added and revised the hygiene requirements for some water quality indicators. For example, the total coliform group has been revised from the previous “3 or less” to “not detectable”; in the old standard, the turbidity index was “3-5”, and the new standard increased it to “1-3”.
“Although the new standard has just begun to be implemented, in recent years, various industry authorities have issued corresponding standards.” Tang Xiaoping said that the turbidity of drinking water in Deyang has already met the requirements of “1” or less. Within the scope of inspection, the drinking water in our city has all met the new standard requirements.
Do not solve the secondary pollution, drinking directly is still "Wang Mei quenches thirst"
The new standard has basically been in line with international standards. If it is fully up to standard, it can be drunk directly by unscrewing the tap. Some media reported that the tap water quality of some cities has reached the standard of direct drinking. However, due to the aging of the pipeline or the poor quality of the materials, the secondary water pollution caused by the factory tap water is still only “wangmei quenching thirst”.
According to statistics in 2004, the total length of the water supply pipeline in Deyang City reached 237 kilometers, including 30 kilometers of water intake pipes and 207 kilometers of water supply pipes. In addition, there are more than 30 units with their own water sources, especially large urban enterprises, such as Erzhong, Dongdian, Dongqi, etc. Their living and production water use self-contained water sources, and the internal pipe network system is in the last century. It was built in the early years and has been used for more than 40 years. The pipes are mostly gray cast iron pipes.
The pipes used in the water supply network of the old city include: gray cast iron pipe, flexible cast iron pipe, steel pipe, UPVC pipe, glass steel pipe, etc., which were built between 1985 and 2002. The pipelines such as Changjiang East Road and Minjiang Road are in poor condition and are missing. The rate is high and the squib is frequent. According to statistics, the leakage rate of the water supply pipeline has reached 20%. In the existing water supply pipelines, such as DN400 pipe of Changjiang West Road, DN200 pipe of Zhongshan Street, DN150 pipe of Yanhuashan Road, DN200 of Liangshan Road, and DN200 of Liangshan Road, due to the long construction period, the water leakage of the pipe network is serious, and there are yellow water in some sections. interference.
In order to solve this problem, the municipal water company has planned the transformation of the water supply pipe network, and some of the pipe network transformations have been successfully completed in combination with the road reconstruction.
Small information
There are more than 30,000 water users in the urban area of ​​our city. Deyang City Water Supply Company has four water plants in the northern suburbs, the eastern suburbs, the southern suburbs and the western suburbs. The total public water supply capacity has reached 140,000 cubic meters per day, which greatly exceeds the current daily sales volume of 44,000 cubic meters.
The Beijiao Water Plant, the Dongjiao Water Plant, and the Nanjiao Water Plant all use groundwater as a water source and use manual adjustment to control water supply. The Xijiao Water Plant is a water plant that uses groundwater and surface water as its water source. The groundwater source was partially built in 1998, and the surface water source was partially built in 2003. The water supply was controlled automatically. The Beijiao Water Plant was built in 1987. It is the oldest water plant in the middle of the country. The process is simple and the equipment is aging. The water company has invested in renovation.

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