Ozone generator for domestic sewage treatment
1.1 The oxidative reaction of ozone and water mixing
Usually, ozone is introduced into the water with an ejector installed on the bypass pipe. In order to ensure the water inlet pressure of the ejector, a pipeline pump is installed on the bypass pipe to increase pressure. The mixed liquid of water and ozone after the jet enters the reverberation tank from the upper side and is fully touched, and the water is discharged from the lower side to connect with the main pipe of the circulating water of the swimming pool. The water in the bypass pipe is disinfected under high ozone concentration and then mixed with the water in the main pipe to produce an oxidation reaction. The water circulation period of the commercial swimming pool is 6h, and the water flow of the bypass pipe is 15% to 25% of the flow of the circulating water main pipe, which can ensure that the ozone has a satisfactory mass transfer efficiency and a satisfactory touch time before entering the main line.
1.2 Determine the size of the ozone generator as follows
The output value of the ozone generator for domestic sewage treatment (g/h)=circulating water flow (m3/h) × ozone concentration (g/m3).
The reaction tank is used to oxidize the inorganic and organic pollutants in the water by dissolved ozone and perform disinfection and sterilization. The exhaust valve on the upper part of the reaction tank should be connected with the ozone damage device to remove undissolved ozone before entering the atmosphere.
The volume of the reverberation tank is determined by the following formula: Reverberation tank volume (m3)=circulating water flow (m3/h) × bypass water percentage (%) × response time (h).
Within the temperature range of swimming pool water, the full concentration of dissolved ozone in the pool follows Henry's law. The higher the concentration of ozone in the gas produced by the ozone generator, the higher the full concentration in the water, the higher the mass transfer equilibrium concentration of dissolved ozone, and the better the disinfection performance. it is good. This should be taken into consideration when choosing an ozone generator.
1. Application introduction:
◆Ozone is an internationally recognized environmentally friendly green sterilant, which will not cause any secondary pollution to the environment, and chlorine preparations will react with organic matter in the water to generate a variety of chlorinated organic compounds, such as chloroform, chloroform, etc. All are recognized as carcinogenic mutagen. When a person swims, these toxic substances will be absorbed by the body (the body can absorb 500 ml of water per hour in the water). Chlorinated organic compounds in water can also affect people's eyes and skin, and then cause red eyes and skin rashes.
◆The chlorinated organic compounds and toxic gases such as chlorine that evaporate from the water damage the human respiratory organs, and the use of ozone will not cause such problems.
◆The acidic substances generated by chlorination severely corrode the water treatment system and the equipment and structures in the hall such as grids and heating.
◆Ozone is a strong oxidant, which can effectively decompose the humus in the water, oxidize the iron and manganese ions in the water, decompose the tiny organisms that scatter light in the water, and then greatly improve the clarity of the water, making the water appear beautiful blue. Chlorine preparations have no such effect. In order to make the water blue, swimming pools that use chlorine preparations often require copper salts, which are extremely harmful to people.
◆After participating in chlorine preparations, it will inevitably lead to changes in the pH of the water and make people feel uncomfortable. Therefore, it is necessary to participate in alkaline or acidic substances to neutralize. However, ozone is a neutral substance and this problem does not occur.
◆Ozone can ensure the stability of water quality in high passenger flow and high temperature seasons. When high temperature and high passenger flow, the water quality is often unsafe. At this moment, if chlorine preparations are used, a lot of dosing is required, which will bring a series of side effects, such as pH The change of the value, the impact on the respiratory tract and the human body, etc.; and many ozone doses have no such side effects.
◆Using an ozone generator can greatly reduce the difficulty of management and operation of the water treatment process. At the same time, the ozone generator has high safety, and the chlorine preparation has certain dangers during transportation, storage and use.
◆Ozone can decompose organic matter in water and has a micro-flocculation effect, so under normal passenger flow, flocculants can be eliminated.
◆Under certain use conditions, such as countercurrent circulation and no activated carbon filter tank, ozone can be used as a water treatment agent without adding chlorine agents, flocculants, and pH regulators.