Chlorination of carbamazepine was dramatically enhanced by sunlight photolysis.
These enhancements can be attributed to the in situ HO and O3 production.
Oxidation products were formed from HO and O3 attack at the double bond of carbamazepine.
Oxidation products did not cause any increase or decrease in toxicity to MARA microbial species.
Initial chlorine dosage and pH had a major influence on the removal processes.