Paper Title:
Characterization of Al-Humic Complexation and Coagulation Mechanism
  Abstract

Using fluorescence and optical monitoring techniques, the process of coagulation of natural humic acids (HA) was studied paying attention to the interaction of aluminium and HA. Experiments were conducted using a jar tester equipped with a PDA2000 monitoring device for online monitoring of the Al-humic coagulation process. After flash mixing, slow mixing and settling, the supernatant was collected for fluorescence analysis to measure the concentration of residual aluminium which has not reacted with HA molecules. The process of aluminium hydrolysis was also studied by online monitoring of the formation of ‘alum flocs’ in a solution free from HA. Electrophoretic analysis and TOC measurement were conducted respectively for evaluating the condition of charge neutralization and HA removal. On this basis, the mechanism of Al-humic coagulation was discussed. It can be concluded that at pH 5, charge-neutralization and co-precipitation is the main mechanisms of coagulation, while at pH 7 the main hydrolyzed species are precipitated aluminum hydroxides so that sweep flocculation becomes the main mechanism of coagulation as well as overdosing at pH 5.0.

  Info
Periodical
Advanced Materials Research (Volumes 374-377)
Chapter
Chapter 4: Water Purification and Wastewater Treatment
Edited by
Hui Li, Yan Feng Liu, Ming Guo, Rui Zhang and Jing Du
Pages
964-970
DOI
10.4028/www.scientific.net/AMR.374-377.964
Citation
P. K. Jin, W. A. Ren, X. C. C. Wang, "Characterization of Al-Humic Complexation and Coagulation Mechanism", Advanced Materials Research, Vols. 374-377, pp. 964-970, 2012
Online since
October 2011
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Price
$32.00
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Chapter 2: Material Science and Technology
Abstract:The aim of this work was to evaluate the effects of different coagulation-flocculation conditions on the levels of natural organic matter...
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