Journal
DESALINATION AND WATER TREATMENT
Volume 57, Issue 44, Pages 21015-21022Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/19443994.2015.1115373
Keywords
Sulfamethoxazole; Ozone; Ultrasound; Impact factors; Degradation process
Categories
Funding
- National Nature Science Foundation of China [51121062, 51008105]
- State Key Laboratory of Urban Water Resource and Environment [2014TS06]
- Department of Education Fund for Doctoral Tutor [20122302110054]
- Harbin Institute of Technology Fund for young top-notch talent teachers [AUGA5710052514]
- Postdoctoral Science-Research Foundation of Heilongjiang Province [LBH-Q12106]
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In this study, sulfamethoxazole (SMX) degradation was investigated using an ultrasonic-assisted ozone oxidation process (UAOOP). The influencing factors of ozone concentration, pH, initial SMX concentration, ultrasound power density, and radical scavenger were studied. It was proved that ultrasound application enhanced ozonation function for SMX degradation. Color change of the water during the oxidation process was found to be corresponding to SMX concentration decay in wastewater. The results indicated that SMX degradation followed a pseudo-first-order kinetic model under experimental operating conditions. SMX degradation rate increased with ozone concentration, pH, and ultrasound power density, and was inversely proportional to the initial SMX concentration. Although the direct and indirect oxidation of ozone simultaneously existed in the UAOOP system, the direct oxidation was the predominant way. Meanwhile, the biological toxicity of the solution was weakened and biological oxygen demand/chemical oxygen demand ratio increased from 0 to 0.54. It was indicated that the UAOOP system was efficient to treat SMX wastewater and promote biodegradability for further biological treatment.
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