Methods of Chlorination
There are two terms you should become familiar with: simple chlorination, sometimes
known as breakpoint chlorination and the ammonia chlorine process.
In a fairly clean water, simple chlorination involving the addition of 0.2 - 0.5 mg l-1 of C12 is
normally sufficient to disinfect the water and to provide a persistent chlorine residual in the
distribution system. However, if ammonia is present, this concentration of chlorine will be
insufficient because the chloramine compounds formed are less effective as disinfectants.
In order to get over this problem, breakpoint chlorination is practised.
The essence of breakpoint chlorination is that sufficient chlorine is added to react with all of
the ammonia present, to form monochloramine. Free chlorine will also be present. More
chlorine is added until it reaches a concentration 5 times higher than the original ammonia
concentration.
Methods of ChlorinationThere are two terms you should become familiar with: simple chlorination, sometimesknown as breakpoint chlorination and the ammonia chlorine process.In a fairly clean water, simple chlorination involving the addition of 0.2 - 0.5 mg l-1 of C12 isnormally sufficient to disinfect the water and to provide a persistent chlorine residual in thedistribution system. However, if ammonia is present, this concentration of chlorine will beinsufficient because the chloramine compounds formed are less effective as disinfectants.In order to get over this problem, breakpoint chlorination is practised.The essence of breakpoint chlorination is that sufficient chlorine is added to react with all ofthe ammonia present, to form monochloramine. Free chlorine will also be present. Morechlorine is added until it reaches a concentration 5 times higher than the original ammoniaconcentration.
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