Pretreatment of heterocyclic pesticide wastewater using ultrasonic/ozone
combined process |
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Authors: | Zhenglong Xiong Xiang Cheng and Dezhi Sun |
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Institution: | College of Environmental Science (&) Engineering, Beijing Forestry University, Beijing 100083, China |
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Abstract: | Ultrasonic/O3 combined process was employed to pretreat heterocyclic pesticide wastewater for increasing biodegradability and
reducing biological toxicity. Influences of ultrasonic frequency, ultrasonic power, probe diameter, initial pH and O3 dosage on the COD
removal were studied. The results showed that the ultrasonic/O3 process significantly improved the biodegradability and reduced the
biological toxicity of the wastewater. The ratio of BOD5/COD was increased from 0.03 to 0.55 and the EC50 increased from 11% to 52%
under ultrasonic/O3 treatment. Low ultrasonic frequency brought better COD removal. Initial pH was found to have a high influence
on the COD removal and alkaline conditions were more favorable. The influences of ultrasonic power and probe diameter were small.
With an increase in O3 dosage, COD removal was e ectively improved. The optimal operational parameters for the combined process
on COD removal were ultrasonic frequency 20 kHz, initial pH 9.00, ultrasonic power 300Wand dosage of O3 454.8 mg/(L min), under
which the e ciency of COD removal reached 67.2%. |
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Keywords: | heterocyclic pesticide wastewater ultrasonic O3 BOD5/COD biological toxicity |
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