期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 758, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.143641
关键词
Synergistic disinfection; Secondary effluent; Ozone; UV irradiation; Chlorine
资金
- National Key Research and Development Program of China [2018YFC0406305]
- Key Program of the National Natural Science Foundation of China [51738005]
- Youth Program of National Natural Science Foundation of China [51908317]
This study investigated the effectiveness of different disinfection processes on bacterial inactivation and water quality parameters, finding that combined treatment scenarios were more efficient in removing bacteria and improving water quality, with a relatively low operating cost.
Disinfection of secondary effluents is vital to provide a sustainable aquatic environment, minimize microbial risks and guarantee public and environmental safety. This study investigated the effectiveness of six treatment trains including single and combined disinfection processes (i.e., ozone alone, ultraviolet (UV) irradiation alone, chlorine alone, sequential ozone-UV, sequential ozone-chlorine and sequential ozone-UV-chlorine) on bacterial inactivation, as well as bulk water quality parameters such as color, turbidity, absorbance at 254 nm (UV254), dissolved organic carbon (DOC) and fluorescence based on samples collected from an actual water reclamation plant (WRP). For the single disinfection processes, when the ozone, UV and chlorine doses reached 5 mg/L, 15 mJ/cm(2) and 4 mg/L, respectively, the log removal of Escherichia coli (E. coli) reached 5 log. A trailing phenomenon was observed with further increases in the disinfectant dosage. Under the combined treatment scenarios, ozone pretreatment resulted in substantial removal of color, turbidity, UV254, fluorescence excitation-emission matrix (FEEM) and chlorine consuming organics, thus enhancing the efficiency of subsequent UV irradiation or chlorine treatments. In the sequential ozone-UV-chlorine experiments, E. coli inactivation reached 7 log with ozone, UV and available chlorine of 3mg/L, 5 or 10mJ/cm(2) and 2.5 mg/L, respectively. On the basis of the results from the actual WRP, the estimated operating cost per unit for the disinfection systems is 0.065 CNY/t, which is economical for long-term operation. (C) 2020 Elsevier B.V. All rights reserved.
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