Treatment of phthalic acid esters by electrocoagulation with stainless steel electrodes using dimethyl phthalate as a model compound.
In this study, treatment of phthalates by electrocoagulation employing stainless steel electrodes was investigated using dimethyl phthalate (DMP) as a model compound. DMP was completely destructed within 30 min up to the high initial concentration of 100mg/L while total mineralization was also obtained within a couple of hours. The applied current density of 22.5 mA/cm(2) and electrolyte (NaCl) concentrations varying between 1000 and 1500 mg/L as chloride resulted in the highest treatment performance. The initial solution pH (2-6) had practically no effect on the process efficiency. Desorption experiments and the reaction rates obtained for DMP, COD and TOC abatements appeared to be a strong evidence of an oxidative removal mechanism. DMP removal fitted first order kinetics. COD and TOC removals began after the total DMP removal and also fitted first order kinetics. Activated sludge inhibition experiments revealed that toxicity could be significantly reduced by electrocoagulation application.
Kabdaşli
Işik
I
Environmental Engineering Department, Civil Engineering Faculty, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey. kabdasli@itu.edu.tr
Keleş
Asuman
A
Olmez-Hanci
Tuğba
T
Tünay
Olcay
O
Arslan-Alaton
Idil
I
D000327:Adsorption; D002712:Chlorides / Q000737:chemistry; D004564:Electrocoagulation / Q000379:methods*; D004566:Electrodes; D052244:Endocrine Disruptors / Q000737:chemistry; D004952:Esters; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010100:Oxygen / Q000737:chemistry; D010795:Phthalic Acids / Q000737:chemistry*; D012722:Sewage; D012965:Sodium Chloride / Q000737:chemistry; D013193:Stainless Steel / Q000737:chemistry*; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D002712:Chlorides; D052244:Endocrine Disruptors; D004952:Esters; D010795:Phthalic Acids; D012722:Sewage; D014874:Water Pollutants, Chemical; C024629:dimethyl phthalate; D013193:Stainless Steel; D012965:Sodium Chloride; C032279:phthalic acid; D010100:Oxygen