Graduate Thesis Or Dissertation
 

Preliminary study on the effect of pH on the treatment of lead contaminated wastewaters with ozone

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  • Ozone was found to quickly reduce the concentration of lead in a prepared solution when the solution pH of said solution was greater than 7.0. When a solution having a pH of greater than 7.0 was filtered the concentration of lead was less than approximately 1.0 ppm. 1.0 ppm is the detection limit of the analytical instrumentation used in this study. The lead-II ions were observed to oxidize to lead-IV oxide until a minimum concentration was reached; the oxidation appears to follow first order, reversible reaction kinetics. Mass transfer and pH seem to be the controlling factors of the reaction. No measurable amount of ozone was absorbed into the bulk solution indicating very low mass transfer rates. The oxidation of lead-II ions occurred only at pH values above 7.0. No oxidation was detected in an acidic medium ( i.e., when pH was less than 7.0).
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