期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 231, 期 -, 页码 121-128出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.09.092
关键词
Emerging contaminant; Coagulation; Activated carbon; Membrane; Langmuir model; Natural organic matter
资金
- National Natural Science Foundation of China [51509093, 41703096]
- Project of Science and Technology of Guangdong Province [2017A020216025]
- Natural Science Foundation of Guangdong Province [2016A030310456]
- S&T Innovation Project of Water Conservancy of Guangdong Province [2015-15]
- Fundamental Research Funds for the Central Universities [20178Q052]
Emerging pollutants introduced into surface water pose potential hazards to the safety of drinking water. In this study, the removal performance of three emerging compounds (exemplified by caffeine, diclofenac and octylphenol, with different physico-chemical properties) from synthetic water and source water by combining activated carbon (AC) adsorption and nanofiltration (NF) membrane processes was evaluated and analyzed. Results from synthetic water showed that the adsorption isotherms modeled well with the Langmuir equation. The removal performance of target compounds by AC-NF system was more remarkable than that of NF-AC combination. In the source water system, the integrated AC-NF process with coagulation pretreatment (the alum dosage of 60 mg/L) achieved satisfactory performance (the removal efficiencies of three target compounds reached > 95%). Results showed the electrostatic interaction and pollutant hydrophobicity determined the behavior and the fate of selected PPCPs/EDCs during the sequential treatment process of coagulation, activated carbon adsorption, and NF membrane separation. Finally, the AC and NF membranes were analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy to understand the mechanisms, i.e. electrostatic and hydrophobic effects on the total removal process. It suggests that the integrated AC-NF process with coagulation pretreatment should be a feasible approach for removing emerging compounds in waterworks.
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