Regarding water treatment, first of all, let&#;s talk about water pollution: The total amount of water on the earth is about 1.4*102.8 billion m3, but 97.3% (volume fraction) is ocean salt water that people cannot yet use. The surface fresh water that can be used by human production and life is only Accounting for 0.01% of the earth's total water, more than 2/3 of other fresh water is fixed in the ice caps of the polar regions and mountain glaciers, and nearly 1/3 is retained in underground aquifers. Not only are humans facing a global water crisis, but with the rapid development of industry, agriculture and population growth, the amount of sewage discharged has increased dramatically, causing many rivers, lakes, reservoirs and even groundwater to be polluted to varying degrees. It can be said that wherever there is human habitation and production, there is a problem of domestic sewage and factory wastewater treatment.
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At present, in terms of types of water disinfection, there are chlorine, sodium hypochlorite, bleaching powder, chlorine dioxide, trichloroisocyanuric acid, hydrogen peroxide, ozone and other agents and methods. In addition, there are iodine water, high-priced oxidized water, ultraviolet disinfection and other means. . Among all disinfectants, although chlorine is the most economical, due to the unsafe transportation and storage of chlorine; and the low solubility of the gas in water when added, the pressure of the chlorine bottle is constantly changing, and there is insufficient dosage. Accurate question; in addition, the extremely strong diffusivity of chlorine and other gases has a toxic effect on the environment. The high activity of free chlorine and many organic substances can easily form carcinogenic chlorine compounds such as chloroform, carbon tetrachloride, dioxins, etc. Organic compounds cause secondary pollution to the environment. Therefore, there are more and more proposals to cancel liquid chlorine, and it has attracted increasing attention. Abroad, developed countries such as the United States, Germany, and Japan have quite restricted the use of chlorine. In particular, public places and water plants mainly use sodium hypochlorite liquid for disinfection. Chlorine is mainly used for the final tailwater discharge disinfection in large-scale sewage treatment.
Electrocatalytic oxidation method for wastewater treatment: In recent years, the use of advanced oxidation technology to treat refractory organic matter in water has become a hot research topic. Advanced oxidation technology, also known as deep oxidation technology, is characterized by the generation of hydroxyl radical HO· with strong oxidizing ability. It oxidizes and degrades macromolecules that are difficult to degrade organic matter under reaction conditions such as high temperature and high pressure, electricity, sound, light irradiation, and catalysts. into low-toxic or non-toxic small molecular substances. Electrochemical treatment of wastewater includes direct electrolysis and indirect electrolysis, which effectively improves the probability of removing organic matter. The electrolytic oxidation method, or electrochemistry, treats water, including domestic sewage, industrial water, and factory wastewater. Since it does not cause pollution, it is called green water treatment.
The role of electrode materials in electrolytic treatment of wastewater: Selection of electrode materials: In the process of electrolytic treatment of organic wastewater, electrodes not only play the role of transmitting current, but also catalyze the oxidative degradation of organic matter. Therefore, the selection of electrode materials , directly affects the efficiency of organic matter degradation. Different electrode materials have different degradation reaction mechanisms.
The new technology of electrolytic water treatment has attracted much attention because it has the advantages of no need to add chemicals, small equipment size, small footprint, and no secondary pollution. It has been used to treat hydrocarbons, alcohols, aldehydes, ethers, and phenols. and dyes and other organic matter wastewater, its bactericidal effect is stronger than chlorine, and it is a truly efficient, broad-spectrum, and safe powerful sterilizing and virucidal agent. It has been widely used in the disinfection and epidemic prevention of tap water, reclaimed water, industrial circulating water, swimming pool water, hospital sewage and other water bodies. Compared with other disinfectants, sodium hypochlorite solution has great advantages. It is clear and transparent and mutually soluble in water, completely solving the technical difficulties of gas disinfectants such as chlorine, chlorine dioxide, and ozone that are difficult to dissolve in water and difficult to accurately dose. It also eliminates the need for liquid chlorine, chlorine dioxide, etc. Agents often have safety hazards such as leakage, leakage, poisoning, etc. During disinfection, no side reactants harmful to health and the environment are produced, and there are no many sediments caused by the use of bleaching powder.
The titanium electrode is a new product that uses the cathodic protection anode installed on the sodium hypochlorite generator to catalyze oxidation and degrade water quality through electrode reaction. It is a device that generates sodium hypochlorite solution by electrochemical reaction of low-concentration salt water through the energized electrode. The overall reaction is expressed as follows:
NaCl + H2O &#; NaClO + H2&#; Electrode reaction: Anode: 2Cl- - 2e &#; Cl2 Cathode: 2H+ + 2e &#; H2 Solution reaction: 2NaOH + Cl2 &#; NaCl + NaClO + H2O
The titanium anode for water treatment produced by our company is coated with special materials. The titanium electrode is an indispensable core device of the disinfectant generator. The production process is simple, the investment is low, and the results are quick. Water and salt are used as raw materials for production, and AC 220V power supply is used. It is convenient to obtain materials and simple to produce. The output of disinfectant is stable and high, and the product has a long service life.
The sodium hypochlorite generated after treatment with titanium electrodes can also decompose trace amounts of pesticides remaining on vegetables, fruits and other agricultural and sideline products. It has a major role in promoting the development of modern agriculture and fruit and vegetable packaging industry. It is also worthy of recognition that because the disinfectant produced by the sodium hypochlorite generator does not produce free chlorine in the water like chlorine gas, chlorine dioxide and other disinfectants, it is generally difficult to form carcinogens that are harmful to human health due to the presence of free chlorine. ; Unlike ozone, which can cause damage and poison to life as long as a very weak amount (0.001mg/m3) exists in the air; moreover, it will not cause serious damage to metal pipes like chlorine reacts with water to form hydrochloric acid. corrosion.
For water treatment, our company's main products include ruthenium metal oxide coated titanium anodes and iridium platinum oxide coated titanium anodes, titanium anodes for tap water and domestic water treatment, titanium anodes for food utensil disinfection and swimming pool water disinfection, etc.
In recent years, the production of micro sodium hypochlorite disinfectant generators has continued to increase. The smallest generator electrolytic cell has a volume of only 0.5L, an effective chlorine content of 1.2g/L, and a coated titanium electrode size of 3cm in diameter. The generator is very popular because it is light and easy to carry.
Hypochlorous acid is a small neutral molecule that can diffuse to the surface of negatively charged bacteria and penetrate into the interior of the bacteria through its cell wall to oxidize, thereby killing bacteria. The original water of the natural pond contained E. coli 1.1×105/L, and the total number of bacteria was 2×104/mL. After adding sodium hypochlorite for disinfection for 5 minutes, the E. coli was 100/L, and the total number of bacteria was only 100/mL. The disinfected pond water has been tested by the health department and meets drinking water standards. Small sodium hypochlorite generator is suitable for sterilizing and disinfecting unclean drinking water, such as river water, well water, and sugar water. It is especially useful for field operations, field troops, and areas with water supply systems.
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Sodium hypochlorite can quickly kill various pathogenic bacteria and viruses, such as Escherichia coli, Staphylococcus aureus, hepatitis B virus, Bacillus subtilis black variant spores, etc. Using disinfectant to disinfect daily household items and the home environment can effectively prevent communicable diseases such as hepatitis, typhoid, cholera, and dysentery.
Sodium hypochlorite can be used to disinfect tableware and tea sets, and the effect is better than high-temperature disinfection;
Can be used for disinfection, cleaning, and deodorization of kitchenware, bathtubs, and sanitary ware;
Can be used to disinfect items and clothes used by patients;
Can be used to sterilize baby bottles and toys for infants and young children;
Can be used for surface disinfection of fruits, fish, and vegetables;
Can be used for disinfection and sterilization of swimming pool water.
The titanium anode consists of an inert titanium substrate and a noble metal oxide active coating covering it. Over the past few years, our company has been committed to providing the most ideal anode products for each application field, while also accumulating rich experience. I hope I can help your company develop in the future! Create a better future!
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