Further information on the reduction of micropollutants in wastewater

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Ozonation of wastewater: removal and transformation products of drugs of abuse

Posted: May 10, 2016
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Summarized by: Gerly Hey

Rodayan et al. (2014) carried out a bench-scale ozonation test to remove 7 psychoactive drugs (also referred as “drug of abuse”) from secondary wastewater effluent, employing different ozone to drug molar ratios. The total initial concentration of the drugs in the wastewater was adjusted to be around 100 µg/l. Ozone treatment with pure water was carried out for identification and structure elucidation of the transformation products and for comparison with the wastewater matrix.

At 1:1 molar ratio, highest removal (30%) was obtained for cocaine and oxycodone, while increasing the molar ozone to drug ratio to 8:1 resulted in 50% and 45% removal of methylenedioxymethamphetamine and oxycodone, respectively. On the other hand, methamphetamine and benzoylecgonine were only removed by <10%. From the results, it can be seen that the difference in the removal of the drugs with almost the same structure is attributed to the nature and reactivity of its functional group.

Results also confirmed the presence of transformation products after ozone treatment of wastewater.

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Tags: ozone, Canada

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