کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10236393 | 45144 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural characterization of fulvic acids during composting of sewage sludge
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structural characterization of fulvic acids during composting of sewage sludge Structural characterization of fulvic acids during composting of sewage sludge](/preview/png/10236393.png)
چکیده انگلیسی
Changes occurring in the chemical structure of fulvic acids extracted from composted sewage sludge at different times of treatment were investigated by various chemical methods (elemental analysis, Fourier transform infrared and carbon-13 nuclear magnetic resonance). The starting material was composed of aromatic structures, carbohydrates, polyalcohol or polyacid alkyl side-chains. During the stabilisation phase of composting, microbial metabolism seems to begin by the decomposition of aliphatic alcohols or acids shown by a decrease of absorbance around 1136Â cmâ1, a resonance in C-alkyl and carboxyl areas. In parallel, structures with anomeric, cetal or ketal carbons and aromatic compounds around 102, 130-160Â ppm respectively, were preserved or yielded from microbial decomposition. At the end of composting, the increase of resonance around 32 and 174Â ppm in the NMR spectra and the increase of absorbance around 1142Â cmâ1 in the FTIR spectra suggest the presence of ester/ether linkages and neoformation of alkyl ethers/esters. The latter structures could be considered as new constituent moieties incorporated during humification, rather than compounds somehow trapped in the fulvic acid structures. The end product exhibits more aromatic and polycondensed structures, which are chemically and biologically more stable and less reactive than the starting material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Process Biochemistry - Volume 40, Issue 5, April 2005, Pages 1693-1700
Journal: Process Biochemistry - Volume 40, Issue 5, April 2005, Pages 1693-1700
نویسندگان
Soumia Amir, Mohamed Hafidi, Georges Merlina, Jean-Claude Revel,