Journal
CHEMICAL ENGINEERING JOURNAL
Volume 215, Issue -, Pages 358-365Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.11.053
Keywords
Coagulant aid; Enteromorpha extract; Floc characteristic; Hydraulic conditions
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Funding
- Scientific Technology Research and Development Program of Shandong, China [2010GZX20605]
- Research and Development Projects of Ministry of Housing and Urban-rural Department of the People's Republic of China [2012-K7-7]
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A new coagulant aid, Enteromorpha extract (Ee), was used together with aluminum sulfate (AS) in Yellow River water treatment to assess its effects on floc characteristics. The dual-coagulant, aluminum sulfate-Enteromorpha extract (AS-Ee), was obtained by dosing Ee 30 s after AS dosed. The growth, breakage and regrowth of flocs formed by AS and AS-Ee was comparatively investigated under different hydraulic conditions. Results showed that flocs sizes and growth rates could be obviously improved by Ee addition, and the growth characteristics of flocs produced by AS-Ee were less affected by mixing speed. Furthermore, flocs formed by AS-Ee could resist stronger shear force and longer breakage time than that of AS. Due to its long chains structure of macromolecules, Ee could produce bridging effect besides precipitate charge neutralization and adsorption effects of AS. Therefore, better floc characteristics of AS-Ee were achieved by a combination of two advantages. (C) 2012 Elsevier B.V. All rights reserved.
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