Chlorine doxide is a powerful biocide that has many uses in water treatment.  It is highly effective against all micro-organisms and has a incredibly fast kill time.  Chlorine dioxide is unaffected by pH and travels within the water to all areas of the system.

It does nonetheless have some drawbacks, the major one being that it must be generated on site and being a extremely reactive gas it can be very dangerous if generated incorrectly.  As such the selection of chlorine dioxide generating equipment is essential.

The general method of chlorine dioxide generation is the sodium chlorite and hydrochloric acid system.  This method mixes a mild acid and sodium chlorite within a reaction vessel and injects the resulting chlorine dioxide into the water.  When picking equipment that utilises this method it is essential to make certain that the reaction vessel is adequate for the concentrations utilised and is rhobust enough to withstand the pressure generated.

It is also crucial to ensure that the dosing pumps dosing the chlorine dioxide reaction vessel are isolated with non-return valves.  These non-return valves need to be balanced to ensure they prevent chemicals mixing outside the reaction vessel.  Preferably spring activated diaphragm loading valves should be used.  It is also vital to use very good quality dosing pumps to ensure accuracy and prolonged life. 

The dosing of the chemicals can be performed in 2 ways.  Chemical can be dosed proportionally to the water used.  This is usually performed using a pulse head water meter that measures water throughput and transmits signals to the chemical dosing pumps.  These in turn dose a proper amount of chlorine dioxide chemical into the reaction vessel.

Alternatively the chlorine dioxide can be measured utilising specific chlorine dioxide measuring equipment and chemical added to maintain a specific chlorine dioxide concentration .  This method needs specialist measuring equipment with numerous safety features as otherwise overdosing can quickly occur resulting in a potentially harmful situation.

For additional information on chlorine dioxide water treatment or chlorine dioxide dosing equipment talk to your local water treatment company.