کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4486953 | 1317006 | 2005 | 6 صفحه PDF | دانلود رایگان |
To obtain the strength of flocs against breakup is crucial for controlling flocculation in water treatment and predicting transport of colloidal particles in aqueous environments. Recently, the author reported a method to obtain floc strength from a simple experiment of floc breakup subjected to a laminar converging flow. In this study, this method was applied to natural soil flocs. The flocs were formed by coagulation with 0.5 M NaCl (pH 5.4–5.5, pH 6.6) solutions, 0.1 M CaCl2 (pH 6.4–6.9) solutions, or acidified distilled water with dilute HCl (pH 5.6). Obtained floc strengths were 0.3, 0.7 and 4 nN for Na-, Ca-, and H-coagulated flocs, respectively. Also, floc strength did not change with floc size. These values of floc strengths were 1–3 orders smaller than those of flocs formed with polymer flocculants and/or precipitated ferric or aluminum coagulants.
Journal: Water Research - Volume 39, Issue 14, September 2005, Pages 3273–3278