TOCs and THMs reduced after UV treatment
February 1st 2008 Tests carried out by WRK Design
and Services at the Lightwaves
Leisure Centre in Wakefield
showed a reduction in TOC (total
organic carbon),THMs
(trihalomethanes), combined
chlorine, and TDS (total dissolved
solids) in pool water following
installation of a Hanovia medium
pressure UV system.
Transmission values were higher
post-UV, indicating a reduction in
suspended organic material (with
correspondingly lower
absorbance) as a result of UV.The
lower combined chlorine levels
also indicated lower levels of
organic material, matching the
higher transmission values.
Chlorine reacts with organic
material to form combined
chlorine, so lower organics would
result in less combined chlorine,
lower absorbance, and therefore
higher transmission.
The results of the analysis
indicated that the medium
pressure UV system at Lightwaves
Leisure Centre was beneficial in
reducing TOCs and THMs to very
low levels (~ 25 µg/L) up to 14
days after installation. More articles from Hanovia Limited: | 
