The ozone-bio-activated carbon process is a process that combines four technologies of physical and chemical adsorption of activated carbon, ozone chemical oxidation, biological oxidation degradation and ozone sterilization.
The following is a brief introduction to two advanced treatment technologies for activated carbon.
I. Ozone-biological activated carbon technology
The ozone-bio-activated carbon process is a process that combines four technologies of physical and chemical adsorption of activated carbon, ozone chemical oxidation, biological oxidation degradation and ozone sterilization. Firstly, the ozone pre-oxidation is used to initially oxidize and decompose organic matter and other reducing substances in the water to reduce the organic load of the biological activated carbon filter. At the same time, ozone oxidation can break the chain and open the ring, which is difficult to biodegrade in water, and convert into simple fat. Hydrocarbons, changing their biochemical properties. In addition to its own ability to oxidize certain harmful organic substances into harmless substances, ozone can also objectively increase the organic matter of small molecules, so that the adsorption function of activated carbon can be better played. Activated carbon can rapidly adsorb dissolved organic matter in water, and at the same time, it can enrich microorganisms and grow a good biofilm on its surface. By its own oxygenation, microorganisms in the carbon bed can grow and multiply with organic matter as nutrient. Good gas bacteria, resulting in the biodegradation of small molecule organic matter adsorbed by activated carbon. The ozone-bio-activated carbon process can effectively remove organic matter and ammonia nitrogen from water, and has good removal effect on inorganic reducing substances, color and turbidity in water, and can effectively reduce the water-induced mutagenic activity and ensure the drinking water. Safety. However, the method has certain requirements on the indicators of the source water (such as ammonia nitrogen content) and the original treatment process (such as pre-chlorination).
The ozone-bio-activated carbon process is one of the most effective advanced treatment methods in the world to remove organic pollutants from drinking water. The process is developed on the basis of adsorption of activated carbon, and combines the advantages of both ozone and activated carbon. If ozone is used alone, the cost is high, and the bio-assimilated organic carbon (AOC) in the water increases, resulting in poor bio-stability of the water; the activated carbon alone has a synergistic effect of adsorption and microbial degradation, and the saturation cycle of the adsorption is shortened. Maintaining water quality goals must be regenerated frequently. The ozone-activated carbon combined process effectively overcomes the limitations of the above two separate applications, and fully exerts the advantages of both, so that the water treatment effect is greatly improved. In addition, the ozone-activated carbon combined process can effectively reduce the AOC (Bioassisizable Organic Carbon) value, and greatly improve the biological stability of the effluent. The microorganisms attached to the activated carbon can maintain the activity for a long time and effectively prolong the activated carbon. Regeneration cycle.
Second, oxygen-activated carbon combined with advanced treatment technology
Activated carbon is a porous material composed of macropores, mesopores and micropores. The removal of organic matter mainly depends on the adsorption of mesopores and micropores. Ozone activated carbon combined with advanced treatment technology adopts the method of adsorption of activated carbon after ozone oxidation, and continues oxidation in the adsorption of activated carbon. The basic principle is to add ozone to the carbon layer, transform the macromolecules in the water into small molecules, change the molecular structure and shape, and provide the possibility that the organic matter enters the smaller pores, so that the organic matter on the surface of the activated carbon in the macropores is oxidatively decomposed. Therefore, the activated carbon can fully adsorb the oxidized organic matter to achieve the purpose of deep purification of water. Of course, the ozone activated carbon combination technology also has its limitations. For example, ozone may also produce some toxic and harmful intermediates while destroying some organic structures. The results show that the water source is treated with ozone 2 activated carbon for advanced treatment, and the effluent water quality after chlorination may still be mutagenic.
At present, most of China's urban water sources are polluted to different degrees. When conventional treatment processes cannot work effectively, activated carbon can be used as an effective means for deep treatment and pretreatment of drinking water treatment. Therefore, it is meaningful to study the removal of organic substances in drinking water by activated carbon. . In terms of pretreatment, adsorption pretreatment has a good application prospect due to the development of new adsorbent materials; in the advanced treatment, ozone-bio-activated carbon technology has become the mainstream process for micro-polluted water treatment. In the future, water treatment technology will increasingly emphasize the organic combination of physical, chemical, biological and other methods, and give full play to their respective technical characteristics and advantages for comprehensive management to achieve the best removal effect at the lowest cost. Of course, in order to truly solve the problem of drinking water quality, in addition to strengthening the development of water treatment technology, it is also necessary to strengthen source control, strengthen environmental protection publicity, and improve the environmental awareness of the whole people.
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