期刊
WATER RESEARCH
卷 47, 期 16, 页码 6234-6243出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2013.07.042
关键词
Synthetic dye; Decolorization; Mineralization; Ozone; Hydrogen peroxide
资金
- special fund of State Key Joint Laboratory of Environment Simulation and Pollution Control [13Y01ESPCT]
- National Special Program of Water Pollution Control and Management [2012ZX07301-005, 2012ZX07205-001]
Degradation of a synthetic azo dye, Orange II, by electro-peroxone (E-peroxone) treatment was investigated. During the E-peroxone process, ozone generator effluent (O-2 and O-3 gas mixture) was continuously sparged into an electrolysis reactor, which was equipped with a carbon-polytetrafluorethylene (carbon-PTFE) cathode to electrochemically convert the sparged O-2 to H2O2. The in-situ generated H2O2 then reacted with the sparged O-3 to produce center dot OH, which can oxidize ozone-refractory organic pollutants effectively. Thus, by simply combining conventional zonation and electrolysis processes, and using a cathode that can effectively convert O-2 to H2O2, the E-peroxone process degraded Orange II much more effectively than the two processes individually. Complete decolorization and 95.7% total organic carbon (TOC) mineralization were obtained after 4 and 45 min of the E-peroxone treatment, respectively. In comparison, only 55.6 and 15.3% TOC were mineralized after 90 min of the individual ozonation and electrolysis treatments, respectively. In addition to its high efficiency, the E-peroxone process was effective over a wide range of pH (3-10) and did not produce any secondary pollutants. The E-peroxone process can thus provide an effective and environmentally-friendly alternative for wastewater treatment. (C) 2013 Elsevier Ltd. All rights reserved.
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