ProMinent chlorine dioxide, Powerpoint presentation
in drinking water treatment "typically 70% of the initial dose of chlorine dioxide is converted to chlorite" "initial dosage of chlorine dioxide should not exceed 1.4 ppm to prevent exceeding DBP formation"{ "Iron Removal -1.2 mg / mg iron -immediate Manganese Removal -2.5 mg / mg manganese -immediate Sulfide Removal -5.8 mg / mg H2S Taste and Odour -1 -2.5 mg/L 10 minutes contact time Bacteria Inactivation -1 to 5 mg/L 5 minutes contact time Giardia -1.5 to 2.0 ppm 60 minutes contact time Cryptosporidium -Approx 8-16 times giardia" "Acid / Chlorite Method. Sodium chlorite can be supplied in two concentrations. 25% and 7.5%, depending on the generation rate required. Acid solution is also supplied at two concentrations, 32% and 9%to correspond to the sodium chlorite solution. No secondary storage is required -thus no intermediate decomposition of chlorine dioxide to chlorite" "DBP Formation Potential -Chlorine Dioxide does not form halogenated byproducts, THM and HAA5 constituents when it interacts with NOM, as long as no excess chlorine is present from generation. Chlorine Dioxide does form Chlorite and Chlorate, both have limits, however chlorate is not as problematic as chlorite." "if initial demand and dosage is kept below 1.4 ppm, then no DBP formation over the set guidelines" "Extended storage of chlorine dioxide solution can contribute to byproduct formation."
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