PH is one of the most important and frequent testing items in chemistry. It is an important parameter for evaluating water quality. Although it has no direct health effects, it will affect other water quality indicators and water treatment effects.
Monitoring scheme for online analysis of water quality in water supply network
Urban water supply network is a complex and large-scale pipeline network system, which is the lifeblood of cities. As an important part of urban infrastructure, underground water supply network management, which guarantees water for residents, production, public services, and other aspects, is one of the basic information for planning, construction, and management of urban management departments. "Water supply, serve the society" in advance. From July 1, 2012, China has compulsorily implemented the new edition of the "Sanitary Standards for Drinking Water". As many as 106 new national standards have been tested. Before, tap water only tested the factory indicators. The new national standard required that the peripheral water and secondary water supply also meet the standards.
※ Current situation of water network management
In recent years, water pollution incidents on the water pipe network have occurred frequently throughout the country. For example, the water pollution incident in Huilongguan, Beijing, the water pollution incident in Ruichangyu, Jiangxi Province, the water pollution incident in Xinhang Community, Huanggu District, Shenyang City, and other accidents, residents in the relevant areas suffered from physical discomfort and even severe hospitalization. In addition, the water pipe network is rusted, scaled, leaked and leaked after aging. Poorly sealed water storage facilities in residential quarters, high-rise buildings and other buildings have no sealing measures, resulting in the occurrence of animal and plant corpses and garbage deposition in the water storage facilities. Water storage facilities are not maintained, cleaned, and disinfected in a timely manner throughout the year, resulting in serious deterioration and pollution of water bodies. This makes people increasingly worried about the potential safety hazards of tap water resources and requires continuous improvement.
With the continuous improvement of residents' requirements for drinking water, the stability and safety of water quality in urban water supply networks have gradually received great attention. Monitoring water quality changes, predicting and controlling water quality through water quality monitoring technology has become a new requirement for the development of urban water supply industries.
※ Basic parameters of pipe network water quality monitoring
According to the development of the water quality monitoring field and the requirements of relevant national standards, the water network management system needs to test the latest water quality parameters as follows:
Residual chlorine refers to the amount of chlorine remaining in the water after it is consumed by bacteria, microorganisms, organics, and inorganic substances in the water. This amount of chlorine is called residual chlorine.
If there is no chlorine in the factory water or the amount of added chlorine is insufficient, bacteria, Escherichia coli and other microorganisms may multiply in the pipe network and affect 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 maintained in municipal tap water to ensure the safety of microbial indicators of drinking water. China's "Sanitary Standards for Drinking Water" stipulates that after contact with water for 30 minutes, chlorine should not be lower than 0.3mg / L. In addition to the factory water, the central water supply should meet the above requirements, and the water at the end of the pipe network should not be lower than 0.05mg / L.
In addition, if the residual chlorine concentration in tap water is too high, the following hazards will exist:
1. Very irritating and harmful to the respiratory system.
2. It is easy to react with organic matters in the water to generate carcinogens such as chloroform.
The residual chlorine index is required to maintain effective disinfection of the water body without odor.
Turbidity is the degree of turbidity of water. It is a measure of the decrease in water transparency caused by insoluble substances in water. Insoluble matter includes solid particulate matter (sand, corrosive matter, planktonic algae, etc.) and colloidal particulate matter suspended in water. It is not only related to the content of suspended matter, but also to the composition, particle size, shape of the impurities in the water, and the reflection performance and content of the surface. It is a vital indicator for water to. Decreasing turbidity also reduces bacteria, coliforms, viruses, cryptosporidium, iron, and manganese in the water. Studies have shown that when the turbidity in water is 2.5NTU, 27.3% of the organic matter in the water is removed, when the turbidity is reduced to 0.5NTU, the organic matter is removed by 79.6%, and when the turbidity is 0.1NTU, most of the organic matter is removed to cause disease The content of microorganisms is also greatly reduced. Especially for the water industry, the turbidity index is very critical.
PH is one of the most important and frequent testing items in chemistry. It is an important parameter for evaluating water quality. Although it has no direct health effects, it will affect other water quality indicators and water treatment effects. Too low pH will corrode the water pipe, too high will cause the dissolved salts to precipitate, reducing the chlorination disinfection effect. At the same time, long-term drinking of water with too low or too high pH will also have a certain impact on human physical health.
Conductivity is an indicator of the conductivity of a solution. Generally, the more impurities in the water, the stronger the conductivity of the water body. Therefore, the conductivity value can reflect the amount of impurities in the water from the side; the more pure the water, the smaller the conductivity.
※ System advantages
With the promulgation and implementation of the National "Sanitary Standards for Drinking Water", local governments have paid more and more attention to the quality of tap water, and the importance of monitoring water quality parameters has become increasingly apparent. The online water quality monitoring system for domestic water is an automatic water quality monitoring system established on the site. It is used to continuously and automatically monitor the water quality change of the measured water body, objectively record the water quality status, and timely detect abnormal changes in water quality, so as to implement water quality reporting for the water supply point. To achieve the purpose of mastering the continuous monitoring of residual water chlorine, turbidity, PH, conductivity and other parameters of drinking water network, prevent water pollution accidents, and provide technical services and monitoring data for customers, water companies and relevant regulatory departments.
1. Realize automatic, real-time remote pipe network monitoring. Instead of the traditional, tedious, and manual inspection of the artificial water supply pipeline network, it overcomes the negative feedback of the slow monitoring and reporting of the pipeline network and the lack of practical effects, and it can greatly reduce and reduce labor consumption. With the continuous increase of the water supply network, the area of water supply is getting larger and larger, and the establishment of a real-time, remote, accurate and automatic monitoring system of the network is an effective method.
2. Real-time water quality monitoring of the pipeline network. Real-time online monitoring of turbidity, residual chlorine, pH, and conductivity of the most important core parameters of water quality in the pipeline network, and establish an effective monitoring management mechanism and networked monitoring equipment. Necessary water quality monitoring instruments and means can detect unexpected water pollution accidents early and reduce the occurrence of health and safety accidents that endanger the water supply network and drinking water.
4. Provide a reliable basis for efficient and long-term stable operation of the pipe network. Provide historical data of the pipe network to reflect the staged health status of the water quality of the pipe network, provide a reasonable basis for systematic decision-making for the operation of the pipe network, and improve the timeliness and scientificity of the decision.
According to the basic parameters required for water quality monitoring in water network management, a multi-parameter water quality online analysis system with remote communication function needs to be established when monitoring the water quality of the water network management in multiple regions.
In order to better serve the water quality safety of the water pipe network, Shanghai Nuobo Environmental Protection Technology Co., Ltd. launched a multi-parameter water quality online analysis system for the market.