Disinfection is an important step in ensuring that water is safe to drink. Water systems add disinfectants to destroy microorganisms that can cause disease in humans. Water treatment requires public water systems to disinfect water obtained from surface water supplies, or groundwater sources under the influence of surface water.

Primary methods of disinfection include use of chlorine, chloramines, ozone, or ultraviolet light. Other disinfection methods include chlorine dioxide, potassium permanganate, and Nano filtration. Since certain forms of chlorine react with organic material naturally present in many water sources to form harmful chemical by-products, the U.S. Environmental Protection Agency has proposed maximum levels for these contaminants- the principal ones being tri-halomethanes (THM’s).
Our natural environment contains numerous microorganisms. Most of those present no concerns. However, some—such as Giardia lamblia and various viruses, which can be present in water supplies—are extremely harmful and can cause disease in humans. These disease-causing organisms are known as pathogens. Because pathogens can be present in drinking water supplies, disinfection is very important— the EPA requires it for surface water and groundwater under the influence of surface water. When combined with conventional treatment, such as coagulation, flocculation, sedimentation, and filtration, good results have been obtained. Direct filtration, slow sand filtration, and diatomaceous earth filtration, along with disinfection, have been just as successful. Groundwater systems may have to add filtration if the water contains excessive amounts of iron and manganese, because insoluble oxides form when chlorine, chlorine dioxide, or ozone are added to these systems. Both ozonation and chlorination may cause flocculation of dissolved organic matter, thus increasing turbidity and necessitating filtration. The effectiveness of disinfection is judged by testing for an indicator (total coliform bacteria). This organism is considered harmless, but its presence indicates that pathogens may also have survived.

Water Tank Sterilization

Protec is specialized in cleaning and sterilization of drinking water storage facilities. Water storage tanks and delivery pipes must be sterilized prior to use in holding disinfected water for household use. This requires the addition of considerably more chlorine compound than mere disinfection .The tank and all delivery pipes are then flushed after a period of hours, followed by refilling with the water to be used for household use.

We use code AWWA C562 for tank sterilization and similar control methods. This standard for disinfection of water facilities covers; safety concern, facility preparation, disinfection to interior surfaces of the facility, and sampling and testing for coliform bacteria after sterilization.
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PROTEC is a privately owned company established in Doha, Qatar engaged in the fields of Engineering, Supply, Construction, Installation, Commissioning, Operation and Maintenance of various types of equipment for the Water, Waste Water, Energy, and Industrial markets.


Head Quarters: Middle East,
Africa & CIS

: (+974) 44 16 93 25
: (+974) 44 32 39 77
: (+974) 44 16 94 36

: info@protecind.com