کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10396025 | 889098 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biodegradation of octylphenol polyethoxylate surfactant Triton X-100 by selected microorganisms
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Octylphenol polyethoxylate (OPEOn) surfactants are used in numerous commercial and industrial products. Large amounts of such surfactants and their various residual biodegradation by-products are ultimately released into the environment. OPEOn biodegradation was performed in this study using pure cultures of Pseudomonas species and strains under different environmental conditions. Environmental factors including the pH, nitrogen sources, and growth kinetics of the cells were investigated. The intermediates of Triton X-100 biotransformation were detected by high performance liquid chromatography-mass spectrophotograph (HPLC-MS). We found the highest specific growth rate (μ) was 0.56 hâ1 and this was achieved by strain E with an initial concentration of Triton X-100 of 5000 mg Lâ1. A pH level of 7 was most favorable for cell growth for all five strains. The highest specific growth rate was achieved using (NH4)2SO4 as the sole nitrogen source for strain E. Strain A showed an enhancement of growth when between 0.2 and 1.4 mg Lâ1 of H2O2 was added. Detection of intermediates was possible after four days of transformation and the octylphenol triethoxylate (OPEO3) peak was predominant, while the high molecular weight peaks had all disappeared. The kinetic analysis demonstrated that the greatest maximum specific growth rate (μmax) and the greatest saturation constant (Ks) of 0.83 hâ1 and 5.24 mg Lâ1, respectively, were obtained for strain E in 5000 mg Lâ1 Triton X-100. The higher Ki revealed that strain A was resistant to higher Triton X-100 concentrations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 96, Issue 13, September 2005, Pages 1483-1491
Journal: Bioresource Technology - Volume 96, Issue 13, September 2005, Pages 1483-1491
نویسندگان
Hsi-Jien Chen, Dyi-Hwa Tseng, Shir-Ly Huang,