Chlorine disinfection technology

Chlorine disinfection mainly kills bacteria through the oxidation of hypochlorous acid. Hypochlorous acid is a small neutral molecule that can diffuse to the surface of negatively charged bacteria, and penetrate into the inside of bacteria through the cell wall of the bacteria. Oxidation destroys the enzyme system of the bacteria and causes the bacteria to die, but the killing effect on the virus and parasite eggs in the water is poor, and a higher value is needed to achieve the ideal sterilization effect. Commonly used chlorine disinfectants are trichloroisocyanuric acid chlorination, SDIC, CHC, etc.

Ozone disinfection

The disinfection mechanism of ozone includes direct oxidation and indirect oxidation that produces free radicals. Like chlorine and chlorine dioxide, it destroys the structure of microorganisms through oxidation to achieve the purpose of disinfection. Its advantages are good bactericidal effect, low dosage, fast action, and can control iron, manganese, color, taste and smell in water at the same time. It can oxidize toxic and harmful substances such as cyanide and phenol into harmless substances; it can oxidize odor and color-causing substances, thereby reducing odor and chroma; it can oxidize soluble iron and manganese to form insoluble precipitates, which are removed by filtration; It can oxidize and decompose large-molecule organics that are difficult to decompose into small-molecule organics that are easily biodegradable.

Chloramine disinfection

Chloramine disinfection is one of the disinfection methods of chlorine derivatives. Due to its slow disinfection effect, chloramine cannot be used as a basic disinfectant and was once stopped. However, because chloramine can avoid or slow down certain chemical reactions between chlorine and organic pollutants in the water, thereby significantly reducing the generation of chlorinated by-products in the water after disinfection, chloramine disinfection is widely regarded as an effective means to control the formation of disinfection by-products. .

UV disinfection

Ultraviolet technology uses a specially designed high-efficiency, high-intensity and long-life wavelength ultraviolet light generating device to generate ultraviolet radiation to kill various bacteria, viruses, parasites, algae, etc. in the water. The mechanism is that a certain dose of ultraviolet radiation can destroy the structure of biological cells, and kill aquatic organisms by destroying biological genetic material, so as to achieve the purpose of purifying water quality.

Carbon dioxide

The disinfection mechanism of chlorine dioxide is mainly oxidation, which can better kill bacteria and viruses, and does not cause damage to animals and plants. The sterilization effect lasts for a long time and is less affected. It can deodorize and decolor. Chlorine dioxide is a strong oxidant. It has good adsorption and penetration performance on the cell wall of bacteria. It can effectively oxidize the cell enzyme system and quickly control the synthesis of cell enzyme proteins. Therefore, under the same conditions, it is effective for most bacteria. It shows higher removal efficiency than chlorine, and is an ideal disinfectant. It has many advantages of chlorine and ozone disinfection. The disadvantage is that it produces chlorite ions. Chlorine dioxide itself is also harmful and cannot be stored and needs to be prepared on site. The oxidizing power of chlorine dioxide is stronger than chlorine and hydrogen peroxide, but weaker than ozone.

With the continuous improvement of people's requirements for drinking water quality, more and more attention is paid to the side effects of chlorine and chlorine derivatives disinfection and the degree of harm. How to control the disinfection by-products in drinking water has become one of the challenges facing the water supply industry. As a reliable supplier of water treatment chemicals, Fengbai can provide customers with high performance chemicals for drinking water treatment.