Sodium hypochlorite sterilization

Sodium hypochlorite solution is a broad-spectrum bactericidal algaecide with a wide range of uses. It not only has a strong bactericidal and algae killing effect, but also has the advantages of better safety and easy storage. The sodium hypochlorite disinfection method is used as a replacement technology for liquid chlorine by the existing urban water plants. For example, the water plants in the central urban areas of Beijing and Shanghai have switched to sodium hypochlorite for disinfection. This method is currently the safest and easiest to operate. Disinfection method.

 

Sodium hypochlorite solution is hydrolyzed into hypochlorous acid and hypochlorite radical in water. Hypochlorous acid has strong oxidizing properties, its molecules are adsorbed on the surface of pathogenic microorganisms, and enter into cells to destroy the enzymes and genetic systems of pathogenic microorganisms, so as to achieve the effect of disinfection . In industry, it is generally prepared by introducing chlorine gas into sodium hydroxide solution. Yellow-green transparent liquid with a specific gravity of 1.16-1.18 and a pungent odor. The pH value is 12-14, which is corrosive. Personnel should wear goggles and rubber gloves when contacting. Chemical pumps or special barrel pumps should be used for pipetting. The sodium hypochlorite solution for water treatment and disinfection should be a grade Aa product, the mass fraction is generally between 8% and 12%, and the solution is a colorless or light yellow-green aqueous solution.

 

Sodium hypochlorite is unstable, easy to decompose when exposed to light, and needs to be stored away from light. Its decomposition speed is related to the concentration, temperature, and pH of use. High concentration, fast decomposition, high temperature, and acid decomposition are fast. Therefore, sodium hypochlorite needs to be stored in the dark and avoid contact with acidic gases in the air. The waste water discharged during automobile production mainly comes from stamping workshop, welding workshop, injection molding workshop, injection molding painting workshop, body painting workshop, engine assembly workshop, final assembly workshop, die casting workshop, machining workshop, etc. Among them, the wastewater generated by the painting workshop includes degreasing, pre-degreasing, phosphating, electrophoresis and paint mist purification wastewater; the waste water generated by the injection molding painting workshop mainly includes cleaning wastewater and paint mist purification wastewater. The wastewater generated in the frame workshop includes electrophoresis wastewater, degreasing wastewater, topcoat wastewater and phosphating wastewater. The waste water produced by other workshops mainly includes emulsion, cleaning waste water, and oily waste water from machining. The waste water discharged from each production workshop has a wide variety of types, complex components, irregular discharge, poor biodegradability, and large fluctuations in water quality and quantity.