The HOD MP UV system effectively removes Free Available Chlorine (FAC) by targeting both forms present in water—hypochlorous acid (HOCl) and hypochlorite ion (OCl⁻), each with unique absorption characteristics. At pH levels below 7, HOCl is predominant and highly reactive to UV exposure, breaking down more easily into chloride ions (Cl⁻) and oxygen (O₂). As pH rises above 7.5, OCl⁻ becomes dominant; it is less reactive and requires more UV energy for breakdown.
The broad spectrum of wavelengths emitted by HOD medium-pressure UV lamps enables efficient removal of FAC by breaking chemical bonds in both HOCl and OCl⁻, regardless of the water’s pH level.
The end result is identical to the GAC and SBS which is Cl-, achieved in a more reliable, efficient and environmentally friendly method.
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