Removal of pesticides from wastewater by electrochemical methods – A comparative approach

 

Sustain. Environ. Res., 21(6), 401-406 (2011)

 

AUTHOR(S)

Balakrishnan Ramesh Babu, Kamal Mohamed Seeni Meera and Perumal Venkatesan

KEY WORDS

COD, electro-Fenton, electro oxidation, electro coagulation, pesticide effluent, pH

ABSTRACT

Three different electrochemical techniques namely, electrooxidation, electrocoagulation and electro-Fenton of pesticide effluent (contains methyl parathion, atrazine and triazophos) were chosen for this study. Experiments were carried out at different pH to determine the optimum pH condition. Chemical oxygen demand (COD) of the effluent reduced at the end of 6 h from 1810 to 431 mg L-1 (pH 6) by electrooxidation, to 210 mg L-1 (pH 10) by electro coagulation and to 341 mg L-1 (pH 8) by electro- Fenton. The results revealed that a high COD reduction was observed by electrocoagulation at pH 10 (88%), followed by electro-Fenton at pH 8 (81%) and electro oxidation at pH 6 (76%) at a constant current density of 5 A dm-2. Further we have also determined current efficiency, energy consumption and the cost of degradation.

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