Journal
CHEMICAL ENGINEERING JOURNAL
Volume 365, Issue -, Pages 334-343Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.028
Keywords
PMS-assisted electro-oxidation/coagulation; Manganese and phosphorous removal; Ceramic membrane; Membrane fouling
Categories
Funding
- National Science Foundation for the Outstanding Youngster Fund [51522804]
- National Natural Science Foundation of China [51778170, 51808131]
- Natural Science Foundation of Guangdong Province, China [2018A030310569]
- Guangdong provincial education department Youth Innovative Talents Project, China [2017KQNCX055]
- One hundred Youth Science and Technology Plan, Guangdong University of Technology, China [220413227]
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This study considers peroxymonosulfate (PMS)-assisted iron electrolysis for electro-oxidation/coagulation (EO/EC) pretreatment combined with a ceramic ultrafiltration (UF) membrane for simultaneous manganese (0-1.0 mg/L) and phosphorus (0-0.8 mg/L) removal from surface water. The results indicated that the optimum EO/EC operation conditions appear to be current(I) of 0.2 A with an electrolysis time of 60 s at pH 7.5 (corresponding to nearly 0.5 mg/L Fe2+) under a PMS dosage of 100 mu M. Electron paramagnetic resonance (EPR) spectroscopy suggested that sulfate radicals (SO4 center dot-) or hydroxyl radicals ((OH)-O-center dot) were produced during the PMS activation process, and manganese oxide formation after the EO/EC process was elucidated on the basis of the results of X-ray photoelectron spectroscopy (XPS). In addition, EO/EC pretreatment might favour the generation of large flocs and significantly decrease the UF fouling, and SEM-EDS indicated the existence of Mn, P and Fe in the flocs. In real applications, the combined process achieved trace levels of manganese and phosphorous, and membrane fouling was caused by the remaining manganese/ferric oxide. This combined process could treat pollutants in remote regions where electricity supplies are not available.
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