Tap water quality monitoring program
※ Summary
The urban water supply network is a pipeline network system with complex structure and huge scale, which is the lifeblood of the city. As an important part of urban infrastructure, the underground water supply network management, which guarantees the water use of residents, enterprises, public services and other aspects, is also one of the basic information for urban management departments to plan, build and manage. It is also an advance for water supply enterprises to achieve "high-quality water supply, serving the society". Since July 1, 2012, China has enforced the new version of the Sanitary Standard for Drinking Water, with up to 106 new national standard test indicators. Previously, tap water only tested factory indicators, while the new national standard requires that the peripheral water and secondary water supply meet the same standards.
※ Basic parameters of pipe network water quality monitoring
According to the development in the field of water quality monitoring and the requirements of relevant national standards, water network management needs to detect the following water quality parameters:
1. Residual chlorine
Residual chlorine refers to that after chlorine is put into water, in addition to the amount of chlorine consumed by bacteria, microorganisms, organics and inorganic substances in the water, there is still a portion of chlorine left, which is called residual chlorine.
If there is no chlorine in the factory water or the amount of chlorine added is insufficient, bacteria, Escherichia coli and other microorganisms may multiply in the pipe network, affecting the water quality of the pipe network. Therefore, a certain amount of residual chlorine must be guaranteed in the water supply pipe network. Therefore, a certain amount of residual chlorine must be kept in municipal tap water to ensure the safety of microbial indicators of drinking water. According to the Sanitary Standard for Drinking Water in China, the chlorine shall not be less than 0.3mg/L after 30 minutes of contact with water. Except that the factory water of centralized water supply shall meet the above requirements, the water at the end of the pipe network shall not be less than 0.05mg/L.
In addition, if the residual chlorine concentration in tap water is too high, the following hazards will exist:
① It is very irritating and harmful to the respiratory system.
② It is easy to react with organic substances in water to generate carcinogens such as chloroform.
The index of residual chlorine requires that the water body should always be kept effectively disinfected without odor.
2. Turbidity
Turbidity refers to the turbidity of water, which is a measure of the reduction of water transparency caused by insoluble substances in water. Insoluble substances include solid particles (sediment, corrosives, planktonic algae, etc.) and colloidal particles suspended in water. It is not only related to the content of suspended solids, but also related to the composition, particle size, shape of impurities in water, as well as the reflective property and content of their surfaces. It is a crucial indicator for water arrival. The turbidity is reduced and the bacteria, coliform, virus, cryptosporidium, iron, manganese, etc. in the water are also reduced. The research shows that when the turbidity of the water is 2.5 NTU, the organic matter in the water is removed by 27.3%; when the turbidity is reduced to 0.5 NTU, the organic matter is removed by 79.6%; when the turbidity is 0.1 NTU, most of the organic matters are removed, and the content of pathogenic microorganisms is also greatly reduced. Especially for the water industry, the turbidity index is very critical.
3.PH
PH is one of the most important and frequent detection items in chemistry and an important parameter for uating water quality. Although it has no direct health effect, it will affect other water quality indicators and water treatment effect. Too low PH value will corrode the water pipe, and too high PH value will cause dissolved salt to precipitate, reducing the chlorination disinfection effect. At the same time, long-term drinking of water with low or high PH will also have a certain impact on human physiological health.
4. Conductivity
Conductivity is an indicator of the conductivity of solution. Generally, the more impurities in the water, the stronger the conductivity of the water. Therefore, the conductivity value can reflect the amount of impurities in the water body from the side; The purer the water, the smaller the conductivity.
※ System advantages
With the promulgation and implementation of the National Sanitary Standards for Drinking Water, local governments pay more and more attention to the water quality of tap water, and the importance of water quality parameter monitoring is increasingly apparent. The online monitoring system of domestic water quality is an automatic water quality monitoring system set up on site. It is used to continuously and automatically monitor the water quality change of the measured water body, objectively record the water quality status, timely discover abnormal changes in water quality, and then report the water quality of the water supply point. It aims to master the continuous monitoring of residual chlorine, turbidity, PH, conductivity and other parameters of drinking water pipe network, prevent water pollution accidents, and provide technical services and monitoring data for customers, water companies and relevant regulatory authorities.
1. Realize automatic and real-time remote pipe network monitoring. It replaces the traditional, tedious and manual inspection and analysis of water supply pipe network, overcomes the adverse impact of slow feedback and lack of effectiveness of pipe network monitoring and reporting, and greatly reduces the labor consumption. With the continuous increase of water supply network, the water supply area is becoming larger and larger. It is an effective way to establish a real-time, remote, accurate and automatic network monitoring system.
2. Realize real-time water quality monitoring of the pipe network. Carry out real-time online monitoring on the most important core key parameters of pipe network water quality, such as turbidity, residual chlorine, PH, conductivity, etc., and establish an effective monitoring management mechanism and networked monitoring equipment. Necessary water quality monitoring instruments and means can detect unexpected water pollution accidents as early as possible and reduce the occurrence of health and safety accidents endangering the water supply network and drinking water.
3. It provides reliable basis for efficient and long-term stable operation of the pipeline network. The historical data of the pipeline network is provided to reflect the staged health status of the water quality of the pipeline network, provide a reasonable basis for system decision-making for the operation of the pipeline network, and improve the timeliness and scientificity of decision-making.
※ System characteristics
According to the basic parameters to be detected in the water quality monitoring of the water supply network, it is necessary to establish a multi parameter online water quality analysis system with remote communication function when monitoring the water quality of the water supply network in multiple areas.
In order to better serve the water quality safety of the tap water network, Shanghai Noble Environmental Protection Technology Co., Ltd. launched a multi parameter online water quality analysis system for the market.
The system has the following characteristics:
1. Parameters of water quality can be monitored in real time: water temperature, PH, residual chlorine, turbidity, conductivity, etc. Different acquisition schemes are provided according to different environments to ensure the accuracy and long-term stability of data. It can be integrated into multi parameter cabinet instrument.
2. With RS485 communication interface, it is convenient for on-site users to manage and view data in real time on the upper computer.
3. The system consists of sensor/electrode, transmitter (instrument), wireless module, etc
4. Data remote monitoring can monitor data in a short distance by wire, or alarm notification and data transmission can be conducted via the Internet through wireless modules such as wifi and gprs. Computers or mobile devices can remotely conduct real-time online monitoring of the corresponding monitoring points of the water pipe network through relevant software (such as the upper computer software system, mobile phone APP), and can remotely connect with the corresponding regulatory authorities. It is convenient for users to receive alarms and store relevant data at the remote end.
