Ozone is an allotrope of oxygen, chemical formula is O3, molecular weight is 48.00, light blue gas, dark blue liquid and purple-black solid. The smell is similar to that of fish, and it is similar to that of chlorine when the concentration is too high. Ozone has strong oxidizability, such as oxidizing silver into silver peroxide, oxidizing lead sulfide into lead sulfate, and reacting with potassium iodide to generate iodine. Turpentine and gas can spontaneously ignite in ozone. ?
In the presence of water, ozone is a powerful bleaching agent, which can oxidize unsaturated organic compounds at low temperature and generate ozone oxides. Ozone can be used as bleaching agent, fur deodorizer, air purifier and disinfectant. In chemical production, ozone can replace many catalytic oxidants or high-temperature oxidants, which simplifies the production process and improves the productivity. Liquid ozone can also be used as an oxidant for rocket fuel.
Ozone exists in the atmosphere, which can absorb the short-wave rays (below 30 nanometers) harmful to human body in the sun, prevent such short-wave rays from irradiating the ground, and protect organisms from ultraviolet rays. Ozone can make most pigments fade, slowly corrode rubber and cork, and is often used for disinfection and sterilization of beverages, air purification, bleaching, water treatment and disinfection of drinking water, as well as killing molds and eggs in granaries.
It can react with unsaturated organic compounds to generate ozonides, which can be decomposed in the presence of water, and the original unsaturated bonds are opened to generate aldehydes, ketones and carboxylic acids. It can also be used to determine the structure of unsaturated organic matter.
technology application
1. wastewater treatment: ozone is used as pretreatment or combined with other methods as post-treatment, such as flocculation+ozone, ozone+biological filter (biological activated carbon method, etc.). ) and ozone+membrane treatment;
2. Coagulation-ozone oxidation technology: In coagulation-ozone oxidation technology, ozone can change the properties of suspended solids in water, thus changing the removal effect of coagulation operation unit. This method can make the suspended particles in water bigger and the dissolved organic matter into miscible gel particles, thus reducing the dosage of coagulant and the consumption of chemical agents. ?
3. Ozone-biochemical method: In recent years, there have been many reports on patents for treating wastewater by this method. Ozone is used to pretreat wastewater, which destroys refractory organic matter in water and improves biodegradability, and then activated carbon biofilter is used for further treatment. This technology makes full use of the strong oxidation of ozone and the cost advantage of biofilter, and the combined treatment effect is good.