What is used to disinfect urban tap water now?
Countries have stipulated health inspection standards for disinfected tap water. my country's health standards stipulate that after adding chlorine, after 30 minutes of contact, the residual chlorine contained in each liter of water shall not be less than 0.3 mg; in centralized water supply, in addition to the factory water should meet the above requirements, the residual chlorine in each liter of water at the end of the pipe network should be Not less than 0.05 mg. After disinfection, the total number of bacteria per milliliter of water should not exceed 100, and the number of coliform bacteria should be less than 3 per liter. When using water, you sometimes smell chlorine, which is the smell of residual chlorine contained in the water. What is the best way to disinfect tap water now?
Nowadays, Showba chlorine dioxide disinfectant can be used for tap water. It is not a hazardous chemical and can directly replace hydrochloric acid and sodium chlorate. The chlorine dioxide generator does not need to be replaced. What disinfectants are used in water plants now?
Use chlorine for disinfection. What are flocculants and disinfectants used in water plants now?
There are many types of disinfectants in water plants. Let’s briefly introduce some of them:
Chlorine: affordable, but it also retains harmful substances, especially heavy metals in the water. and nitrites and other ingredients. At the same time, the transportation process and water storage in water towers will cause a certain degree of secondary pollution. Although water is boiled, heavy metals and other harmful substances in the water cannot be removed
Ozone: It quickly removes color and odor. It causes five secondary pollutions. It is more expensive, has no protective margin, and has no continuous sterilization ability; it is safe. High requirements
Bleaching powder: sterilization efficiency is not high
Flocculant is used for sewage treatment in water plants. Types of flocculants: polyaluminum chloride, basic polyaluminum chloride, polymer Aluminum ferric chloride, etc.
There is a new product PAC, which has the following advantages compared with other coagulants: l. It has a wide range of applications and is adaptable to a wide range of water-based properties. 2. It is easy to quickly form large alum flowers and has good precipitation efficiency. 3. The suitable PH value range is wide (5-9), and the PH value and alkalinity of the treated water will decrease little. 4. When the water temperature is low, the stable precipitation effect can still be maintained. 5. The degree of alkalization is higher than that of other aluminum salts and iron salts, and it has little erosion effect on the device. It is a flocculant, a flocculant for water plants, and a flocculant for sewage treatment. The type of flocculant is a physical and chemical index. This product is an inorganic polymer coagulant. It mainly destabilizes fine suspended particles and colloidal ions in edema, aggregates, flocculates, coagulates, and precipitates through mechanisms such as compression of the double layer, adsorption and electrical neutralization, adsorption bridging, and sediment trapping to achieve purification treatment effects. What is used to disinfect tap water?
Tap water is disinfected with Xiuba chlorine dioxide disinfectant.
Chlorine dioxide is a broad-spectrum and efficient bactericide. Experiments and applications have confirmed that it It has good bactericidal effect on bacteria, spores, viruses and algae. Its disinfection effect comes from the strong oxidizing property of chlorine dioxide. Its oxidizing ability is 2.6 times that of chlorine and 2.0 times that of sodium hypochlorite. It is an efficient bactericide. It can kill all bacterial propagules, hepatitis viruses, phages and bacterial spores at 0.1ppm.
1. Chlorine dioxide is not affected by water temperature: The inactivation ability of chlorine dioxide increases as the water temperature increases, thus making up for the decrease in the dissolution rate of chlorine dioxide due to the increase in water temperature.
2. Chlorine dioxide disinfection has a wide range of PH, and can maintain a high sterilization efficiency in the PH range of 2 to 10. Chlorine dioxide can maintain trace amounts in water, and the remaining chlorine dioxide has a long-lasting stabilizing effect. , to prevent re-contamination.
3. It is selective for organic matter in water and does not undergo chlorination reaction with organic matter. The dosage is small and it does not produce carcinogens and other harmful substances such as trihalomethanes. 4. While sterilizing, chlorine dioxide also deodorizes, decolorizes, and removes iron and manganese from the water body, thereby improving water quality.
What is used to disinfect tap water in foreign countries?
Tap water in foreign countries is disinfected with ultraviolet light.
Relevant knowledge extension
Tap water refers to water that is produced through purification and disinfection in tap water treatment plants and meets corresponding standards for people's living and production use. Domestic water is mainly drawn from rivers, lakes, groundwater, and surface water through the water intake pumping station of the waterworks. The waterworks are processed by the waterworks in accordance with the "National Hygiene Standards for Drinking Water" and processed through processes such as sedimentation, disinfection, and filtration, and finally pass through the water distribution pumping station. delivered to each user. What chemicals are most used to disinfect tap water now?
At most it is liquid chlorine. Next is chlorine dioxide.
Is chlorine still used to disinfect tap water now? Previously used
used.
In addition to chlorine, disinfectants also include chlorine dioxide and ozone. Currently, the safest tap water disinfection method in the world is ozone disinfection. However, this method is too expensive, and water treated with ozone is , its retention time is limited. As for how long it can be retained, there is currently no exact concept. Therefore, only a few developed countries currently use this treatment method. What is used to disinfect water plants?
The quality of water sources varies from place to place, so the processes used are also different. Residents generally use chlorine or sodium hypochlorite for water use. What is the best disinfectant for tap water disinfection in Tongren City?
Nowadays, chlorine dioxide is better for tap water disinfection. It is highly efficient, broad-spectrum, has no side effects and no residue. Xiuba can be used