کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4979534 | 1453025 | 2017 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Suitability of humic substances recovered from sewage sludge to remedy soils from a former As mining area - a novel approach
ترجمه فارسی عنوان
مناسب بودن مواد هومیک از لجن فاضلاب برای درمان خاک از یک منطقه معدن سابق - رویکرد جدید
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
چکیده انگلیسی
Batch washing experiments were performed to evaluate the feasibility of using a solution of humic substances (HS) extracted from municipal sewage sludge as a washing agent to remove As from soils at a former As mining area. Soils (S1, S2, S3) differed in organic matter content, pH and As concentration. At pH 4 and a HS concentration of 4000 mg TOC Lâ1, As removal efficiency ranged from 18% (S2) to 27% (S3). In all cases, As removal proceeded according to pseudo-second-order kinetics (equilibrium As concentrations ranged from 625 mg kgâ1 (S3) to 1250 mg kgâ1 (S3); rate constants, from 1.02 Ã 10â5 kg mgâ1 minâ1 (S1) to 2.05 Ã 10â5 kg mgâ1 minâ1 (S3). The time needed to reach equilibrium was 12 h. With double washing, the efficiency of As removal was 1.5-times higher (on average) than with single washing. Double washing increased As stability, as indicated by the reduced partition index, especially in soils S1 and S3. Moreover, HS effectively decreased the content of the most toxic As(III) (by 95-97%).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 338, 15 September 2017, Pages 160-166
Journal: Journal of Hazardous Materials - Volume 338, 15 September 2017, Pages 160-166
نویسندگان
Zygmunt M. Gusiatin, Dorota Kulikowska, Barbara Klik,