期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 256, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2020.117767
关键词
Ozone; Free active chlorine; Non-steroidal anti-inflammatory drugs; Disinfection by-products
资金
- National Natural Science Foundation of China [52070041, 51608109]
- Natural Science Foundation of Jiangsu Province [BK20160675]
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Overseas Visiting Scholar Program for University Prominent Yong & Middleaged Teachers and Presidents
In this study, the combination of FAC and O3 significantly improved the removal of pollutants, with O3, ·OH, and RCS playing important roles in removing target contaminants. Compared with O3 alone system, the average mineralization of pollutant in O3/FAC system increased from 20.6% to 34.0%, demonstrating the effectiveness of this new method in removing contaminants.
In this study, free active chlorine (HOCl/OCl-, FAC) was employed as an activator of ozone (O3) to remove typical non-steroidal anti-inflammatory drugs of aspirin (ASA) and phenacetin (PNT). The combination of FAC and O3 significantly improved the removal of pollutants. O3 molecules, hydroxyl radicals (center dot OH) and reactive chlorine species (RCS) contributed to the removal of target contaminants in O3/FAC system. By fitting the pollutant removal pattern with the experiment and model, the contribution of each oxidative species in O3/FAC system was measured. The average removal contribution of O3, center dot OH, and RCS to ASA/PNT was 10.3%/8.4%, 53.8%/ 10.5%, and 35.9%/81.1%, respectively. Compared with O3 alone system, the average mineralization of pollutant in O3/FAC system increased from 20.6% to 34.0%. The formation of five typical CX3R-type disinfection byproducts (DBPs) was evaluated with post-chlorine system. The maximum concentration of total DBPs was achieved at pH 6.0 of 12.5 mu M, in which trichloromethane (TCMs) was the main component (accounting for 55.3%). This study provides a new method to remove contaminants based on the combination of O3 and FAC disinfectants.
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