The reason why sodium hypochlorite generator is indispensable for tap water disinfection
Nowadays, most tap water disinfection uses chlorination method. The main purpose of chlorination of public water supply is to prevent water-borne diseases. Chlorine gas dissolves in water and reacts with water to form hypochlorous acid and hydrochloric acid. Hypochlorine plays a major role in the entire disinfection process. acid. For inorganic substances that produce odor, it can completely oxidize and disinfect them. For living natural substances such as algae and bacteria, it can penetrate fine walls and oxidize their enzyme systems (enzymes are biological catalysts). It loses its activity, causing the life activities of bacteria to be hindered and killed. Hypochlorous acid itself is close to neutral, and it is easy to get close to bacterial cells and shows good sterilization effect. Hypochlorite ions also have a certain disinfection effect, but it has negative effects. It is difficult to get close to the bacteria due to the electric charge (bacteria are negatively charged), so its sterilization effect is much worse than that of hypochlorous acid, so the disinfection effect of chlorine is better than that of bleaching powder.
The tap water treatment process is complex, including chemical and physical clarification processes, pumping stations, transporting raw water to the tap water plant, and the flocculation tank using mixing agents to generate floc in the water. During the precipitation process, the flocs in the water are removed due to physical principles such as electrical adsorption. suspended solids. During the separation process, the sedimentation tank intercepts impurities with larger particles in the water that are prone to sedimentation in the sedimentation tank or clarification tank.
After going through the above multiple processes, there are still bacteria, viruses, parasite eggs, algae and other microorganisms in the water. These microorganisms can pose a huge threat to human health, so there is a key step of disinfection before distribution to thousands of households.
From simple chemical disinfection: such as chlorine dioxide generators, dosing devices, sewage treatment equipment to now sodium hypochlorite generators.
More than a hundred years ago, the tap water industry began to use chlorine disinfection. Chlorine disinfection has the advantages of low price, simple operation and good disinfection sustainability, and it once became a widely used disinfection method. However, chlorine itself is highly toxic, and chlorine has hidden dangers during transportation, storage, and operation. Subsequently, chlorine dioxide was used for its strong oxidizing ability. However, chlorine dioxide is unstable and difficult to ensure transportation. In the preparation of chlorine dioxide, During the process, a large amount of toxic raw materials (chlorates, etc.) that did not participate in the reaction will also cause secondary pollution to the water quality. In addition, chlorine dioxide has high operating costs, approximately five times more than sodium hypochlorite.
Nowadays, from the perspective of house preservation and operating costs, sodium hypochlorite disinfection has become one of the widely recognized choices. However, since commercial sodium hypochlorite solution is not easy to store for a long time, it is mostly prepared on site by electrolyzing low-concentration brine. This equipment is called a sodium hypochlorite generator. It has low operating costs and good disinfection effects, and has become a popular new disinfection method. The on-site preparation of sodium hypochlorite through electrolysis only requires three raw materials: water, salt, and electricity. The disinfection principle of sodium hypochlorite is the same as that of chlorine, but ready-made sodium hypochlorite can be prepared at any time as needed. The raw materials are convenient to obtain, avoiding the inconvenience of raw material procurement, and the operating cost is relatively low.
Sodium hypochlorite solution is a widely used strong oxidant for sterilizing and algae killing. Its sterilizing effect is equivalent to that of chlorine. Compared with other disinfectants, sodium hypochlorite solution can be miscible with water in any ratio, solving the problem of gas disinfection such as chlorine, chlorine dioxide, ozone and so on. The technical difficulty of the agent being difficult to dissolve in water and making it difficult to accurately add it eliminates the hidden dangers of leakage, leakage, poisoning, etc. that chlorine, chlorine dioxide, ozone and other agents often have. At the same time, it is easy to store, easy to decompose, and It has no residue, is non-toxic and harmless to the human body, and is an ideal disinfection method. Today’s water plants are indispensable!
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Nicole
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