Summary of Application of ozone in water treatment

Ozone water treatment

   In the Netherlands for the first time since 1893 the ozone for water treatment, has been 100 years of history, in the meantime, Europe and the United States earlier understanding of ozone, according to the report, as of 1940, the foreign systems for handling water There are more than 100 sets, to 1977, has reached more than 1000 sets. In recent years, with the development of the domestic economy and the domestic industry's progress ozone for ozone in a variety of water treatment applications, but also have a more consistent understanding of, and in the water, process water, purified water and sewage treatment and other is beginning to promote the application.
   Ozone as a strong oxidant, disinfectant, with sterilization, disinfection, bleaching, deodorization, inactivated virus, reducing COD and so on, can be widely used in various water treatment; while ozone is a green disinfectant, does not produce secondary pollution, which is the other disinfectants unparalleled advantage.
    Application of ozone for water treatment technology mainly by the air handling system, ozone generation system, power control system, automatic monitoring and protection system and gas water mixtures composed of several parts. The concentration of ozone for water treatment units is generally measured by "mg / L" calculation, which is commonly used in air type "mg / m 3" a thousand times worse, can be seen, water with a high concentration, a large amount of occurrence ozone generator is suitable, so the stability of equipment, product life is to ensure the normal operation of the main indicators.

   Ozone gas-water mixing device is essential equipment for water treatment, although ozone soluble in water, ten times higher than oxygen solubility, but must adopt certain technical means to make full contact with ozone and water, wherein the contact area, time, the ozone concentration, pressure, etc. are the determinants of the efficiency of mixing. Currently, ozone and water mixture are several, see: Product Navigation - gas-water mixing device
         Ozone in water treatment applications are mainly the following aspects:

  A drinking water treatment

  International standards for drinking water for the total number of bacteria, coliforms are zero, Western Europe and other countries are implementing this standard, so the water supply company's ozone water treatment product application is widespread. Result from the development of the economy is relatively backward, the national drinking water health standards for bacteria total number of <100, coliform <3, and they use bleach, chlorine and chlorine dioxide in recent years to promote and sodium hypochlorite generating equipment disinfection. Because chlorine disinfection will produce secondary pollution caused by chlorine derivatives, including trihalomethanes is a direct carcinogen, drinking water treatment in Europe has been phased out. Ozone generator on the current domestic prices, and chlorine dioxide, sodium hypochlorite price is almost even lower.

   Ozonation most widely applied technology, the most successful areas of drinking water treatment. Ozone for drinking water treatment, sterilization effect, no secondary pollution, but also both bleaching, deodorization, removal of iron, manganese, oxidative decomposition of organic matter and coagulant effects, and some reported that ozone water disinfection can be large some harmful substances. In particular, the recent launch of the "ozone + BAC" drinking water treatment technology, but also so that we are confident of ozone treatment of drinking water.

  With the current increase in high-rise, high-rise secondary water supply is also very common. 1996 Ministry of Health issued a document requiring secondary water disinfection facilities must be installed, some units Wells water quality standards must also be allowed to use the case. Secondary water disinfection and treatment products, currently only in the chlorine dioxide, sodium hypochlorite and ozone generating equipment selection, ozone in water treatment has a strong competitive advantage, should be a mature market, including mineral water, purified water, bottled Water is a must to use ozone technology products market, it is difficult to leave the ozone standard equipment.

  Drinking water treatment equipment in the use of ozone, ozone dosage should be based on the water quality of the different options, the contact time is 10-15 minutes.
  Second, swimming pool water treatment

   Ozone technology for swimming pool water treatment technology has been very mature, very widespread use in Europe and America and other countries, international competition pool most of the use of ozone treatment technology, our swimming pool water standards require the total number of bacteria <1000, Coliforms <100 , turbidity <5. Currently the main use chlorine, bleaching powder, copper sulfate disinfection means, in the water quality standards, they also cause secondary pollution, causing water garish, skin irritation and other adverse consequences, especially chlorine use in potentially big threat, if disclosure would poisoning caused extensive pollution, the use of people live in fear. Ozone for the case of the water quality standards, there is no more defects can ozonized water disinfection donor strain for cosmetic, more economical to reduce or eliminate the use of the drug consumption, cost reduction, quality shelf life is extended, the national establish saving society.

  Three, aquaculture water treatment

  Ozonation aquaculture water, fish, shrimp, crab grows extremely favorable economic benefits are very obvious. Organic farming because of its rich water, water quality is very vulnerable, bacteria and viruses spread of bacteria on fish and shrimp are also very rampant in recent years, many coastal shrimp ponds was never produced, and thus the formation of a large number of abandoned.
   Ozone water treatment in aquaculture, in addition to sterilization and bacteria on fish inhibit viral infection, transmission, but also can degrade organic matter, reduce chemical oxygen demand (COD) and biochemical oxygen demand (BOD), but also because of coagulation effect on the improvement of water quality is a good measure. In recent years, serious water pollution, water pollution caused illness and deaths of large numbers of fish are common, while ozone can degrade NH3, SO2 and red tide toxins and other harmful substances, indicating that ozone technology in the aquaculture industry promotion is necessary.
   There are reports, aquaculture water is treated with ozone for fish ponds can increase more than 30% of the shrimp ponds can increase more than 60% of the fish, shrimp, crabs comparison test, were increased more than 90% survival rate, breeding water using ozone, generally a virus has caused damage sterile water, the ozone concentration into 0.5-1.2mg / L can kill all bacteria in the water, if used as a preventive ,0.5-0 .7 mg / L is sufficient.
   Fourth, the circulating cooling water treatment

   Cooling water is very common in the industry, such as paper mills, power plants, fertilizer plants, chemical plants and so on. In recent years, the rise of the central air-conditioning equipment is also inseparable from the circulating water. In recent years, due to the circulating cooling water found a great harm to human Gram-negative pathogens, so that people are increasingly concerned about the circulating cooling water treatment process. In the late 1970s, the United States conducted a large number of circulating cooling water ozone treatment studies to prove ozone has corrosion, scale, sterilization, algae, water, pollution and many other advantages, and treatment costs less than traditional processing methods, Therefore, ozone treatment of circulating cooling water has a broad prospect.

  Five, industrial wastewater treatment

  Ozone application in industrial wastewater treatment is widespread, common are: printing and dyeing wastewater, wine and alcohol wastewater, wastewater, papermaking wastewater. Ozone as a strong oxidizing agent, for the above terminal sewage treatment, first ensure that sewage discharge, two water reuse as an important means to achieve the recycling of water resources, plays a dual role. Countries have clear requirements, reuse of water recycling rate of 20% or more, for the serious water shortage to reach 25%. For protein-containing, chroma and heavier wine spilled alcohol wastewater, premenstrual treatment, ozone can be deep processing, the use of ozone and wastewater aeration full contact,

  If COD is 500-600mg / L of ozone in the bleaching rate of 30 minutes 80-90%, COD reduction of nearly 20-30%. Due to industrial waste composition varies, calculate the ozone dosage, generally based on water quality data obtained by experiments.
  Six, composite ozone water treatment technology
   Although ozone has strong oxidation resistance, but there are some limitations, ozone is not a panacea. In sewage treatment, for some organic or intermediate, ozone (in particular low density) and become difficult to remove completely oxidized. So for some composite water treatment, ozone as an important aspect of effective sewage equipped with sophisticated biochemical, or medication-assisted photocatalysis method is necessary.
   Ozone treatment of water use is widespread, but also grasp the different water quality using a number of different ways, if necessary, take some flocculation filtration technology to match. The only way to make ozone water treatment method is widely applied, craft and more mature, more and more broad prospects for development.

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