Water Sterilization Station

Water Sterilization Station

Supplying the new ozone generators in the second sterilization station in Aleppo. As well supervising the installation and testing.

For General Co. For Hydro-projects

When adding only chlorine for sterilizing drinking water it combines with organic and inorganic elements exist in water, such as leaves, a family of chemicals called trihalomethanes, or THMs, is formed, which is a carcinogenic material.

Studies on this material show that it cause rectal cancer and colon cancer. For this, Universal laboratories in charge of human health care has searched for another additional sterilizing method to get rid of this carcinogen materials. As a result they found that using ozone for sterilization at the first stage then adding chlorine at the end is the best way for sterilization, because Ozone has the following properties:

Destroying toxic residuals, resulted from the chlorine combination with the materials existed in water.
Oxygen Saturation
Disinfection (bacteria and germs)
Inactivation of viruses.
Reduction of fetor
Reduction of taste
Elimination of fecal bacteria
Elimination of Sulphur
Oxidation and flocculation of Mn and Fe
Oxidation of detergents

The station consists of three lines to generate ozone gas, each of 10kg/h for the sterilization of water, more than 250000 m3/h, after being treated in the open sand filters. Each line consists of:
Air compressor – initial refrigerant – dryer – ozone gas generator with all its accessories of sensors, valves, filters and electrical panels – Automation panels for monitoring, control and operating according to the current standards in this field – residual ozone gas destructor which takes the floating ozone on the water surface in the contact tanks and change it into oxygen, and drive it out.

- The air compressor is to draw air from the outside atmosphere to extract oxygen from it. This air is pushed at 13 bar pressure, and then received by an air collecting tank supported by filters, required for the purification of air inside the tank, then to get it out. There is an electromagnetic valve to get rid of the condensation which takes place in the tank.
- Then the air goes to the initial refrigerant, which makes a preliminary cooling of air by a Freon compressor, to get rid of the air humidity and to decrease the temperature. At this stage the air is extracted from the impurities through the filters exist on the inlet and the outlet of the initial refrigerant.

- The air goes out of the initial refrigerant with some humidity, which could not be got rid of. This problem is treated inside the initial dryer that works on freeing air completely from humidity. The dryer consists of two bottles with aluminum silicates inside, used in extracting the air humidity. the purpose of existing two bottles is that when one of them operates, the other will be in the renewing and standby phase, so they exchange working every 10 minutes or more, and that is according to design of the dryer.
Then the air passes to the ozone generator, completely free from humidity. The generator consists of stainless steel body, and stainless steel pipes inside, where the ozone generating elements are installed. The elements are dielectrics of glass tubes, made of mixtures of 400 materials, to get high quality tubes, which are painted from inside with a conductive material. Each generator could contain 380 glass tubes from the both sides, and the tubes of each side are connected to the medium voltage net (4-8 KV), and that is to generate an electrical arc, which makes an ionization of the oxygen spread in the empty space formed between the stainless steel pipes and the glass tubes, and so O2 is changed to become O3 which is named as ozone gas.
The working method of the station:
All of it is automated with the most up-to-date international techniques:

The compressor is controlled by the microprocessor with a screen, made by the manufacturing company of the compressor- inside it there are all the required protections for the drawn air and for the compressor equipment of motor, compressor and electromagnetic valves.
The initial refrigerant is controlled by a microprocessor with a screen, made by the manufacturing company of the refrigerator.
The dryer also is controlled by a microprocessor
All those microprocessors are connected by the central monitoring
panel, which monitors the operation of the equipment continuously.
Each generator is controlled by PLC for commanding monitoring and measuring with reading screens of the recent situation. The PLC is connected with the central monitoring panel, where we see through its screens all the information about the station.
The automation process is supported by the required sensors; the ozone leakage in the station hall is the most important, so that orders will be given according to the seriousness of the spread amount of the leaked ozone, whether to decrease the generator capacity or to stop it completely. Above that all, there are destructors for the residual ozone which floats on the water surface of the contact tanks, where inside it the ozone is mixed with water. The destructors take the residual ozone, destruct it and change it to oxygen then throw it to the outside air. those destructors are also connected to the central monitoring panel and this means that:
The whole station is controlled and monitored by the most up-to-date techniques and programming; and all that is to generate the ozone, with the required amount and time and with the less economic cost for investment, that is what we mean by the electrical bills

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