Chlorine Decay, Water Age, and THMs - OH MY - Ohiowater.org
Chlorine Decay, Water Age, and THMs - OH MY - Ohiowater.org Chlorine Decay, Water Age, and THMs - OH MY - Ohiowater.org
TOC Concentration, mg/LChlorine Decay, Water Age, and THMs – OH MYTHM Treatment Control Methods• Enhanced softening• Mg(OH) 2 acts as coagulant adsorbing TOC• Additional 10% to 30% TOC removal possible• Avoid saponification with high pH5.505.255.004.754.504.254.003.75High pHleads to poorremovals3.503.253.002.752.509.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00Water pH, s.u.36
Chlorine Decay, Water Age, and THMs – OH MYTHM Treatment Control Methods• Biological Filtration• Sufficient oxidation to increase BDOC and AOC• Ozone most common, but other strong oxidants can beused• Conventional treatment can result in biological TOCreduction in filters• 6% to 14% observed in full-scale operations• GAC substrate used to grow TOC reducing bacteria37
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TOC Concentration, mg/L<strong>Chlorine</strong> <strong>Decay</strong>, <strong>Water</strong> <strong>Age</strong>, <strong>and</strong> <strong>THMs</strong> – <strong>OH</strong> <strong>MY</strong>THM Treatment Control Methods• Enhanced softening• Mg(<strong>OH</strong>) 2 acts as coagulant adsorbing TOC• Additional 10% to 30% TOC removal possible• Avoid saponification with high pH5.505.255.004.754.504.254.003.75High pHleads to poorremovals3.503.253.002.752.509.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00<strong>Water</strong> pH, s.u.36
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