Biodegradation of four phthalate esters in sludge

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• 作者：B.V. Chang ; T.H. Wang ; S.Y. Yuan
• 关键词：Biodegradation ; Phthalic acid esters ; Sludge ; Ultrasonic pretreatment
• 刊名：Chemosphere
• 出版年：2007
• 期刊代码：15_00456535
• 类别：env
• 出版时间：October 2007
• 卷：69
• 期：7
• 页码：1116-1123
• 文件大小：526 K

摘要

This study investigated the effects of ultrasonic pretreatment and various treatments on the aerobic degradation of four phthalic acid esters (PAEs) such as diethyl phthalate (DEP), benzyl butyl phthalate (BBP), di-n-butyl phthalate (DBP) and di-(2-ethyl hexyl)phthalate (DEHP) in sludge. The effect on PAE degradation of treating sludge with a 20 min sonication period at a power level of 0.1 W ml⁻¹ was evaluated. The degradation rates of the four PAEs were DBP > BBP > DEP > DEHP. Degradation rate constants (k₁) and half-lives (t_1/2) for the four PAEs (50 mg kg⁻¹) ranged from 0.182 to 0.379 day⁻¹ and 1.8 to 3.8 days, respectively. The optimal pH for PAE degradation in sludge was 7.0 at 30 °C. PAE degradation was enhanced by the addition of yeast extract, brij 30 or brij 35 and inhibited by the addition of hydrogen peroxide. Our results show that a combination of ultrasonic pretreatment and biodegradation can effectively remove PAE from sludge.