کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4485441 | 1316952 | 2007 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of COD/SO42â ratio and sulfide on thermophilic (55 °C) sulfate reduction during the acidification of sucrose at pH 6
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
This study investigated the effect of the COD/SO42â ratio (4 and 1) and the sulfide concentration on the performance of thermophilic (55 °C) acidifying (pH 6) upflow anaerobic sludge bed reactors fed with sucrose at an organic loading rate of 4.5 g COD lreactorâ1 dayâ1. Sulfate reduction efficiencies amounted to 65% and 25-35% for the COD/SO42â ratios of 4 and 1, respectively. Acidification was complete at all the tested conditions and the electron flow was similar at the two COD/SO42â ratios applied. The stepwise decrease of the sulfide concentrations in the reactors with a COD/SO42â ratio of 1 by N2 stripping caused an immediate stepwise increase in the sulfate reduction efficiencies, indicating a reversible inhibition by sulfide. The degree of reversibility was, however, affected by the growth conditions of the sludge. Acidifying sludge pre-grown at pH 6, at a COD/SO42â ratio of 9 and exposed for 150 days to 115 mg lâ1 sulfide, showed a slower recovery from the sulfide inhibition than a freshly harvested sludge from a full scale treatment plant (pH 7 and COD/SO42â=9.5) exposed for a 70 days to 200 mg lâ1 sulfide. In the latter case, the decrease of the sulfide concentration from 200 to 45 mg lâ1 (35 mg lâ1 undissociated sulfide) by N2 stripping caused an immediate increase of the sulfate reduction efficiency from 35% to 96%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 41, Issue 11, June 2007, Pages 2379-2392
Journal: Water Research - Volume 41, Issue 11, June 2007, Pages 2379-2392
نویسندگان
S.I.C. Lopes, X. Wang, M.I. Capela, P.N.L. Lens,