絮凝作用
破损
明矾
铁
化学
硫酸铝
色散(光学)
化学工程
悬挂(拓扑)
降水
澄清器
剪切速率
矿物学
环境工程
材料科学
环境科学
复合材料
无机化学
流变学
气象学
有机化学
物理
数学
工程类
同伦
纯数学
光学
作者
Csb Fitzpatrick,E. Fradin,John Gregory
标识
DOI:10.2166/wst.2004.0710
摘要
Temperature is known to affect flocculation and filter performance. Jar tests have been conducted in the laboratory, using a photometric dispersion analyser (PDA) to assess the effects of temperature on floc formation, breakage and reformation. Alum, ferric sulphate and three polyaluminium chloride (PACl) coagulants have been investigated for temperatures ranging between 6 and 29°C for a suspension of kaolin clay in London tap water. Results confirm that floc formation is slower at lower temperatures for all coagulants. A commercial PACl product, PAX XL 19, produces the largest flocs for all temperatures; and alum the smallest. Increasing the shear rate results in floc breakage in all cases and the flocs never reform to their original size. This effect is most notable for temperatures around 15°C. Breakage, in terms of floc size reduction, is greater for higher temperatures, suggesting a weaker floc. Recovery after increased shear is greater at lower temperatures implying that floc break-up is more reversible for lower temperatures.
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