کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4419793 1618951 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Achromobacter denitrificans strain SP1 efficiently remediates di(2-ethylhexyl)phthalate
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Achromobacter denitrificans strain SP1 efficiently remediates di(2-ethylhexyl)phthalate
چکیده انگلیسی


• A. denitrificans strain SP1; a novel bacterium efficiently degrades hazardous DEHP.
• Successfully demonstrated bioremediation of DEHP blended in a commercial plastic.
• Statistically optimized DEHP degradation – the first report on a phthalate.
• Elucidated the biodegradation pathway of DEHP by A. denitrificans SP1.

This study describes how Achromobacter denitrificans strain SP1, a novel isolate from heavily plastics-contaminated sewage sludge efficiently consumed the hazardous plasticizer, di(2-ethylhexyl)phthalate (DEHP) as carbon source supplemented in a simple basal salt medium (BSM). Response surface methodology was employed for the statistical optimization of the process parameters such as temperature (32 °C), agitation (200 rpm), DEHP concentration (10 mM), time (72 h) and pH (8.0). At these optimized conditions, experimentally observed DEHP degradation was 63%, while the predicted value was 59.2%; and the correlation coefficient between them was 0.998, i.e., highly significant and fit to the predicted model. Employing GC–MS analysis, the degradation pathway was partially deduced with intermediates such as mono(2-ethylhexyl)phthalate and 2-ethyl hexanol. Briefly, this first report describes A. denitrificans strain SP1 as a highly efficient bacterium for completely remediating the hazardous DEHP (10 mM) in 96 h in BSM (50% consumed in 60 h), which offers great potentials for efficiently cleaning the DEHP-contaminated environments such as soil, sediments and water upon its deployment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecotoxicology and Environmental Safety - Volume 112, February 2015, Pages 114–121
نویسندگان
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