Electrochemical detoxification of four phosphorothioate obsolete pesticides stocks.
The phosphorothioate pesticides are widely used for crop production and fruit tree treatment, but their disposal causes serious environmental problems. Four commercial phosphorothioate pesticides (Demeton-S-methyl, Metamidophos, Fenthion and Diazinon) were treated by an electrolysis system using Ti/Pt as anode and stainless steel 304 as cathode. A number of experiments were run in a laboratory scale pilot plant and the results are presented. For Fenthion the achieved reduction was over 60%, while for Demeton-S-methyl, Metamidophos and Diazinon was more than 50%. Diazinon had the lowest energy demand. The COD/BOD5 ratio was improved considerably after electrolysis for all four pesticides examined. As a conclusion, electrochemical oxidation could be used as a pretreatment method of the pesticides detoxification.
Vlyssides
Apostolos
A
School of Chemical Engineering, National Technical University of Athens, 9, Heroon Polytechniou St., 15770 Zografou, Greece. avlys@tee.gr
Arapoglou
Dimitris
D
Mai
Sofia
S
Barampouti
Elli Maria
EM
D004563:Electrochemistry; D004566:Electrodes; D004572:Electrolysis; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D010084:Oxidation-Reduction; D010575:Pesticides / Q000737:chemistry*; D010710:Phosphates / Q000302:isolation & purification* / Q000633:toxicity; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D007220:Industrial Waste; D010575:Pesticides; D010710:Phosphates; C035638:thiophosphoric acid