Basic application of titanium electrode in water sterilization treatment
With the development of industry, the pollution of water sources by various organic substances has increased, and the traditional chlorination method of water supply system has been found to form substances harmful to human body. Therefore, research on new alternative sterilization methods has increasingly become a hot spot and an important development direction at home and abroad. Most of the existing disinfection water processors are electrolyzed to produce chlorine dioxide and sodium hypochlorite after adding electrolytes such as sodium chloride. fungicide. Jiangsu Yianteng Special Electrode New Material Technology Co., Ltd. has developed a new type of electrolytic sterilizer using its own insoluble titanium anode, titanium electrode, and platinum-plated titanium electrode materials, which can achieve the effect of sterilization and algae killing without affecting the water quality. .
For water treatment and sterilization, the oxidative disinfection method of adding chlorine or chloride to water is commonly used. However, it was found that chlorination will lead to the production of "three causes" (carcinogenic, teratogenic, and mutagenic) substances in drinking water. Treatment methods such as ultraviolet, ozone, ultrasonic, magnetization, and static electricity developed in recent years have not been widely used due to complex equipment, small flow of treated water, or high treatment costs. Electrolysis is popular as a sterilizing water treatment technology with good sterilization effect, strong usability and no secondary pollution.
Electrolytic sterilization can be divided into indirect sterilization and direct sterilization:
1. Indirect sterilization: use electrolysis to produce ClO-, HclO3, H2O2, O2-, OH- and other substances to kill microorganisms. Most of the existing commercial disinfection processors are added with electrolytes such as sodium chloride to produce bactericides such as chlorine dioxide and sodium hypochlorite.
2. Direct sterilization: Direct sterilization is the use of electrolytic electrodes to directly act on microorganisms to kill them.
Electrolytic sterilization and disinfection mechanism:
(1) Electrolysis of chlorine-containing water to produce ClO- and a small amount of higher chlorate. The reaction on the electrode is as follows, the anode: 2Cl-2e→Cl2, Cl2+H2O→HClO+H++Cl-, OH- ions diffuse into the liquid layer around the anode and react with hypochlorous acid to generate ClO-, and further react to generate Chloric acid: 12ClO-+6H2O- 12e→4HClO3+8HCl+3O2, the HClO and HClO3 produced are both strong oxidants and have a strong killing effect on microorganisms.
(2) When electrolyzing water without chloride ions, when the raw water does not contain Cl-, it also has a good sterilization effect, indicating that other oxidizing substances other than HOCl? are produced during electrolysis. After analysis, the following reactions exist on the anode side: ① , H2O→H++OH- ②, 20H--2e→[O]+H2O→H2O2③, 4OH--4e→2H2O+O2④, [O]+O2→O3
Therefore, strong oxidizing disinfectants such as H2O2, O3, [O] are produced, so that the treated water has a strong bactericidal effect after electrolysis. (3) Electrolysis directly acts on the bacterial cell body, destroys a bacterial organ, and causes the bacteria to die.
The modern view of chlorine sterilization is mainly through HClO. When the HClO molecule reaches the interior of the bacteria, it can oxidize and destroy the enzyme system of the bacteria and cause the bacteria to die. The final products of oxidation are CO2 and H2O. Therefore, even in the case of continuous use of chlorine, the bacteria will not develop resistance.
