کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
582172 | 1453165 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Supercritical water oxidation of wastewater from acrylonitrile manufacturing plant
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The wastewater from an acrylonitrile manufacturing plant, which is difficult to biodegrade, was decomposed in subcritical and supercritical water. Experiments were carried out at temperature ranging from 299 to 552 °C and a pressure of 25 MPa. The initial total organic carbon (TOC) of acrylonitrile wastewater was set from 0.27 to 2.10 mol Lâ1 with residence times ranging from 3 to 30 s. 30 wt.% H2O2 solution was used as an oxidant with the stoichiometric ratios of O2 based on the initial TOC concentration ranging from 0.5 to 2.5. TOC conversion increased with increasing reaction temperature and residence time, however, beyond the stoichiometric oxygen-TOC ratio of 1:1, TOC conversion was barely affected by excess oxygen. The initial TOC concentration of acrylonitrile wastewater also had a negligible effect on TOC conversion. An assumed pseudo-first-order global rate expression was determined with an activation energy of 53.48(±33.57) kJ molâ1 and a pre-exponential factor of 5.22(±1.74) Ã 102 sâ1. By considering the dependence of the reaction rate on TOC and O2 concentration, a global rate expression was regressed from the complete set of 64 data points. The resulting activation energy was 66.33(±5.87) kJ molâ1; the pre-exponential factor was 6.07(±6.89) Ã 103 molâ0.26 sâ1; and the reaction orders for initial TOC and O2 concentration were 1.26(±0.15) and 0.00(±0.15), respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 163, Issues 2â3, 30 April 2009, Pages 1142-1147
Journal: Journal of Hazardous Materials - Volume 163, Issues 2â3, 30 April 2009, Pages 1142-1147
نویسندگان
Young Ho Shin, Nae Chul Shin, Bambang Veriansyah, Jaehoon Kim, Youn-Woo Lee,