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Experimental Study on Treatment of Pharmaceutical Wastewater with UV-Fenton Oxidation

The pharmaceutical wastewater, a class of industrial wastewater, is characterized by high concentration and low bio-degradability. The treatment efficiency had been compared between Fenton and UV-Fenton of dosage, initial p H, reaction time, and so on. The results showed that the treatment efficiency of UV-Fen-ton oxidation process was better than Fenton. The optimal reaction conditions of Fenton were as follows: thedosage of Fe SO4·7H2O and H2O2 were 0.036 mol/L and 0.128 mol/L respectively, the initial pH was 4.3, the reaction time was 2h, and the removal efficiency of CODCr was 43.9%. However, the optimal conditions of UV-Fenton were as follows: the dosage of FeSO4·7H2O and H2O2 were 0.029 mol/L and 0.102 mol/L respectively, the initial pH was 4.3, the reaction time of UV and Fenton were 7 min and 75 min respectively and the removal efficiency of CODCr was 63.5%. What's more, the B/C was increased to 0.39, which showed that UV-Fenton oxidation could improve biodegradability of the pharmaceutical wastewater.