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| Type |
Poster Presentation |
| Area |
Environmental Energy |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 19일 (목요일) 11:00~12:30 |
| Code |
ENVR.P-515 |
| Subject |
Degradation of pharmaceuticals in polluted waters by electrochemical persulfate activation using iron electrodes |
| Authors |
Yu-Gyeong Kang, YOON-SEOK CHANG *
Division of Environmental Science and Engineering, Pohang University of Science and Technology, Korea
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| Abstract |
Carbamazepine (CBZ) and nalidixic acid (NAL) are pharmaceuticals that were frequently detected in wastewater effluent and surface water due to their poor removal in water treatment plants. Although electrochemical treatments show a great promise in treating the pharmaceuticals, the large scale-up is still limited by high electrode cost and maintenance. In this study, we proposed iron electrodes for the electrochemically activated persulfate (EPS) removal of CBZ and NAL in a simulated wastewater effluent. Remarkably higher CBZ and NAL efficiencies were observed in EPS compared to persulfate and electrocoagulation alone. The CBZ and NAL removal efficiencies drastically increased with increases in persulfate dosage and applied current. Both hydroxyl (HO•) and sulfate radicals (SO4-•) contributed to the oxidation of CBZ and NAL with the former being the dominant species. The presence of chloride and bromide ions dramatically increased the removal of CBZ but not NAL, probably due to the selectivity of generated reactive halide species. Nitrate also enhanced CBZ and NAL degradation while ammonium did not significantly affect pharmaceutical removal. Humic acid was detrimental to CBZ and NAL removal. Other pharmaceuticals such as hydrochlorothiazide and diclofenac were also successfully eliminated by EPS. Our results clearly demonstrated that EPS could be a promising approach in the removal of recalcitrant pharmaceuticals in various wastewater. Studies on the transformation products of target pharmaceuticals, and EPS application in real field waters are currently underway. |
| E-mail |
ygkang74@postech.ac.kr |
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120th General Meeting of the KCS