کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4979902 1367815 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Removal of dissolved sulfides in aqueous solution by activated sludge: mechanism and characteristics
ترجمه فارسی عنوان
حذف سولفید های محلول در محلول های آبی با استفاده از لجن فعال: مکانیزم و ویژگی ها
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
چکیده انگلیسی
Activated sludge recycling has been developed as a novel technique to directly prevent volatile sulfides emission from wastewater influents. In this study, mechanisms and characteristics of dissolved sulfides removal in aqueous solution by activated sludge were investigated. When DO content in water was 0.49 mg/L, 70% of removed dissolved sulfides were released back from the activated sludge by lowering pH to 1. The SEM/EDS result revealed that removed sulfur was fixed in activated sludge and the XPS result showed that fixed sulfur had an oxidation state of −2. FTIR results showed that primary amine group (R-NH2) could be one of the radical groups bonding sulfides. All these results verified that sulfides removal by activated sludge is primarily attributed to adsorption, rather than biodegradation, under low DO conditions in 40 min. The equilibrium isotherm data fit the Langmuir isotherm model well. The maximum adsorption capacity (q0) ranged in 25-38 mg/g at temperatures of 10-40 °C. The adsorption kinetic data fit the pseudo-second-order model well. The amounts of adsorbed sulfides at equilibrium (qe) were positively proportional to temperature, initial sulfides concentration and agitation speed. These results indicate that sulfides adsorption could be a chemical sorption or ion exchange process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 324, Part B, 15 February 2017, Pages 732-738
نویسندگان
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