A Comparative Study: Degradation of 2,5-Dichlorophenol in Wastewater and Distilled Water by Ozone and Ozone-UV

ABSTRACT

The effectiveness of ozone and ozone-UV processes on effluents containing chlorophenol was evaluated. Experiments were performed using 3.06 mM of 2,5-dichlorophenol in distilled water and wastewater at pH 7 with ozone dose of 37 mg/L. An ozone dose of 1.2 g/h was effective in completely degrading 2,5-dichlorophenol and reducing the toxicity of its by-products. Overall, ozone-UV process was more effective in the oxidation of 2,5-DCP. Ozone-UV treatment of wastewater showed the highest mineralization (53%), dechlorination (100%), COD removal (75%), and biodegradability (BOD₅/COD = 0.85). The organic/inorganic matters in wastewater seem to have a positive effect on the oxidation of 2,5-DCP and supports the use of ozone and ozone-UV processes for industrial effluent treatment.

KEYWORDS:

• Ozone
• Biodegradation
• Degradation
• Dichlorophenol
• Oxidation and Wastewater Treatment
• Ozone-UV
• Toxicity

Acknowledgments

The authors would like to thank Dr. Luis Fernandez Linares and M.Sc. Sandra Garcia of UPIBI-National Polytechnic Institute and Dr. Victor Luna Pabello and M Sc. Luciano Hernandez Gomez of The Experimental Microbiology laboratory for their kind assistance.

Additional information

Funding

Jacqueline C. Alexander will like to thank CONACYT for awarding her a scholarship to pursue her Ph.D. and for helping to fund this research project, and the Metropolitan Autonomous University for their financial assistance.