1. Method of ozone oxidation of sewage
The development of ozone treatment technology can be seen from two aspects: first, ozone is used as a pre-treatment or post-treatment combined with other treatment methods, such as flocculation, air flotation, biochemistry, etc.; The second is the development of ozone treatment units themselves, such as photocatalysis, metal catalytic oxidation and so on.
Second, ozone combined with other processes
Ozone combinations such as:
1.O3+ Biochemistry (activated sludge, biological activated carbon method)
2. O3+ flocculation + membrane treatment
3. 3.O3+ membrane processing
4. 4.O3+ Air float (blow off)
5. 5O3+ activated carbon adsorption
6.O3+ flocculation +O3
Third, ozone treatment unit form
Ozone + solid catalysts (solid catalysts such as activated carbon, metals and their oxides). 2. Ozone + activated carbon technology Activated carbon in the reaction, just like the OH- action in alkaline solution, accelerates the decomposition of ozone to generate free radicals such as ·OH. As a catalyst, the reaction of activated carbon and ozone to degrade trace organic pollutants is the same as other reactions involving ozone generation ·OH (such as increasing PH value, adding H2O2, UV radiation), which belongs to advanced oxidation technology. 3, the effect of ozone biological activated carbon and the application of ozone biological activated carbon to the removal of organic matter includes three processes: ozone oxidation, activated carbon adsorption and biodegradation. For the removal of organic matter, the strong oxidation capacity of ozone is first exerted to oxidize organic matter into small molecular organic matter that can be biodegraded, and then the good adsorption performance of activated carbon is used to adsorb it, and then the adsorbed organic matter is biodegraded by organisms adsorbed on activated carbon, and the oxygen generated after ozone decomposition improves the dissolved oxygen in water. The dissolved oxygen in water is often saturated or close to saturated state, and provides conditions for biodegradation in activated carbon treatment. The ozone biological activated carbon water treatment process (BAC method) combined with ozone and granular activated carbon filter is generally placed in the routine removal of organic matter in water, and due to the application of biotechnology, the operation period of activated carbon is greatly extended.
Fourth, industrial wastewater ozone oxidation treatment
1, industrial wastewater Whether drinking water or wastewater, ozone reacts with simple or complex organic matter to obtain some of the same products: acetaldehyde, carboxylic acid, aliphatic, aromatic and other oxides are formed. These products are easily biodegradable and have no obvious toxicity. Ozone can not only oxidize inorganic substances in water, such as CN-, NH3, etc., but also oxidize organic compounds that are difficult to biodegrade, such as aromatic compounds. There are two ways of ozonation reaction: First, ozone directly participates in the reaction through nucleophilic or electrophilic action; The second is that ozone reacts with pollutants through active free radicals, mainly ·OH, under the action of alkali and other factors. Ozone can react with many organic compounds or functional groups: C==C, C≡C, aromatic compounds, heterocyclic compounds, carbon cyclic compounds, ==N -- N, ==S, C≡N, C-n, C-Si, -OH, -sh, -NH2, -cho, -n ==N -, etc. Ozone destruction and removal of pollutants in wastewater have been widely used, and the ozonation products of organic matter are mainly small organic molecules such as monaldehydes, binary aldehydes, aldehyde acids, monocarboxylic acids and binary carboxylic acids.
Five, the advantages of ozone treatment of hospital sewage
Qingdao Aikang ozone equipment kill bacterial reproductive bodies, buds, fungi, bacterial viruses, protozoa such as pseudomonas aeruginosa, Escherichia coli, aureus, Vibrio cholerae, tuberculosis bacillus and vermicular eggs have a strong killing ability, Qingdao Aikang ozone disinfection equipment in the hospital application has many successful cases. The situation of hospital sewage is complex, and it must be pre-treated before disinfection. Generally, the ozone dosage of primary effluent is 30-50mg/l, and that of secondary effluent is 15-20mg/L, and then ozone disinfection is used after secondary treatment.
Main advantages of ozone disinfection:
1. High efficiency: uniform diffusion, good inclusiveness, to overcome the UV sterilization there are many dead Angle weaknesses, can be a full range of fast and efficient disinfection and sterilization; The bactericidal ability is strong, the action is fast, the bactericidal speed is 600 to 3000 times faster than chlorine, and it can kill the viruses and buds with strong antioxidant properties.
2. Less affected by the PH value of sewage and water temperature, it can remove the color, smell, taste and phenol cyanogen and other dirt in the water, increase the dissolved oxygen in the water, and improve the water quality of the disease.
3. It can decompose organic matter and three substances that are difficult to degrade, improve the biodegradability and high cleanliness of water. Ozone has the characteristics of natural decomposition, there is no residue after disinfection, no secondary pollution.
4. The preparation of ozone requires only air to adsorb and transform oxygen through oxygen molecules, without any auxiliary materials and additives, which greatly saves the material cost in the later period.
