A wide variety of organic pollutants, heavy metals and other toxic and hazardous substances are widely found in water bodies. To ensure the safety of drinking water, the water and wastewater company must be upgraded through an advanced treatment process. In the drinking water industry, ozone is mainly used in the pretreatment and advanced treatment. Ozone-bio-activated carbon (O3-BAC) is commonly used to achieve new drinking water mandatory standards.
In order to improve the quality of drinking water, especially for organic pollutants, it is often necessary to add a pretreatment process before a limited conventional process. At present, most water supplier use chlorine as an oxidant for pre-oxidation to reduce the organic content of micro-polluted water sources. As water pollution is becoming more and more serious, increasing the amount of chlorine to achieve the effect, but also increasing the carcinogenic problems of disinfection by-products. At present, most water suppliers use chlorine as an oxidant for pre-oxidation to reduce the content of organic matter in micro-polluted source water. Our design has been successfully run to confirm the following points. The front end of the water treatment process uses pre-ozone oxidation to control the formation of disinfection by-products, partially degrading natural organic matter and inactive pathogenic microorganisms. Pre-ozone oxidation improves the efficiency of turbidity, color, odor, iron, manganese and organic matter in subsequent processes such as flocculation and sedimentation, and significantly increases the removal rate of permanganate index. This also allows for the removal of halogenated hydrocarbon products in water. After the pre-ozone oxidation treatment, the conventional treatment is carried out to optimize the treatment effect.
The main technical function of the O3-BAC tap water treatment process is to remove a variety of dissolved organic pollutants in water through advanced oxidation, adsorption and microbial degradation. Ozone oxidation can effectively remove phenol, cyanide, sulfur, iron and manganese in water, and can decolorize, deodorize and taste, kill algae and eliminate viruses. Biological activated carbon is mainly divided into two stages: pre-physical adsorption and post-microbial degradation. Biological activated carbon has a strong adsorption capacity. It has high degree of microporous structures and a large specific surface area, that can effectively remove active substances such as organic substances, inorganic substances, synthetic detergents and anionic surfactants in the water purification process. After the adsorption period is completed, the organic pollutants and ammonia nitrogen are removed by microorganisms grown on the activated carbon. We use these two processes together. The catalytic action of biological activated carbon catalyzes the oxidation of ozone into hydroxyl radicals to generate oxygen, increasing the concentration of dissolved oxygen (DO) in water.
