Drinking water treatment - Efficient water disinfection with chlorine dioxide generators

Drinking water treatment - Efficient water disinfection with chlorine dioxide generators



Unwanted micro organisms are often found in drinking or process water. These could be germs or disruptive factors for industrial processes. Especially in the food and beverage industry complete production charges could be affected. A further problem is the Biofilm, a slimy layer which is growing on the inside of water pipes or on heat exchangers. Many pathogens build up and reproduce in the protection of the Biofilm. Most disinfectants are not effective against it. The cleanliness of water is to use chlorine dioxide as a disinfectant.The big advantage of chlorine dioxide over other disinfectants is its effectiveness against biofilms. It actually destroys the existing biofilm, thus removing the breeding ground for the pathogens, and prevents it from building up again.

Chlorine dioxide has excellent bactericidal, virucidal, sporicidal, and algicidal properties and because of this, it is used to disinfect water and to inhibit the growth of algae. Chlorine dioxide is a very powerful biocide and a strong oxidizing agent. Chlorine dioxide is being increasingly used in various water treatment applications . Chlorine dioxide does not react with organic matter in water to form Trihalomethanes and Chloramines like chlorine. These substances are toxic and many of them are carcinogenic. Chlorine dioxide does not leave behind any undesirable substances in the water.

Chlorine Dioxide generators provide an alternative method of disinfection to storage of bulk chlorine or pressurized chlorine gas. Chlorine dioxide is produced under vacuum conditions.first molecular chlorine gas is generated by reaction of sodium hypochlorite solution with hydrochloric acid. second chlorine gas is reacted with a sodium chlorite solution to produce the final chlorine dioxide. A chlorine dioxide generator utilizing an automated vacuum feed system minimizes the safety concerns ordinarily associated with storing and using bulk sodium hypochlorite, or chlorine gas.



Generation Process:



CHLORIDIOX CP SERIES - Onsite Chlorine Dioxide Generators

The IEC chlorine dioxide generator offers a simple and effective way of generating a low strength chlorine dioxide solution.clo2

* Safe, on-demand production of chlorine dioxide

* Simple, reliable operation. Safety interlock as mandatory

* Fully automatic or manual operation

* Low maintenance

* metering pumps for precise metering

* Calibration columns provide a simple, economical method for settling pump flow rates

* As basic chemicals for the generation of chlorine dioxide unit uses hydrochloric acid (32% Hcl) and sodium chlorite (25% NaClO2). Both reagents are metered directly from commercial carboys or intermediate storage tanks into the reaction tower where a chlorine dioxide solution is produced.



The CHLORIDIOX Advantage



* Operates simply, reliably and safely

* Retrofits easily into existing chlorination facilities

* Minimizes materials handling and maintenance

* Eliminates chlorine gas & concentrated hypochlorite solutions

* Produces stable, low concentration chlorine dioxide

* Modular construction for adding generators adjacent



The Process



Acid-chlorine is the simplest and easiest to operate generation chemistry. This is a consequence of the use of only two feeds and its simple reaction chemistry. Instead of having to balance the amounts of sodium chlorite and hydrochloric acid, one merely has to provide sufficient hydrochloric acid. The theoretical conversion of sodium chlorite to chlorine dioxide is only 80%.

Calibration column



System Features



* Equally suitable for continuous and intermittent operation

* High stability of the generated chlorine dioxide solution lasting over several days

* Safe automatic restart after mains failure

* Integrated dosing pump for chlorine dioxide

CHLORINE DIOXIDE



Chlorine dioxide is a reactive oxidizing gas that is readily soluble in water. Even dilute solutions (10 ppm) of chlorine dioxide have a characteristic yellow color. The maximum chlorine dioxide concentration typically 4000 ppm. This is to minimize the concentration of chlorine dioxide gas in equilibrium with the solution.



GENERATOR AUTOMATION



Chlorine dioxide generators are automated to provide modulation of chlorine dioxide feed rates based upon changes in flow (flow paced control) and chlorine dioxide demand of the water being treated ( residual control). Theoretically, the chlorine dioxide feed rate may be varied by either modulating the precursor chemical feed rates to the generator or by turning the generator on and off.

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