Effects of polyelectrolytes on reduction of model compounds via coagulation

E. E. Chang, Pen Chi Chiang, Wei Yan Tang, Su Hei Chao, Hao Jan Hsing

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

The objective of this research work was to evaluate the performance of enhanced coagulation by alum and polymer. Synthetic source waters containing high molecular weight humic acids, medium molecular weight tannic acids and low molecular weight p-hydroxybenzoic acid were formulated by adjusting the concentration of turbidity and pH; and jar tests were used to study the effect of various types and dosages of polymer on reducing the above model compounds. At a specific pH condition, the applied alum dosage would efficiently decrease the turbidity to 2 NTU follows the order: humic > tannic > p-hydroxybenzoic acid. Adjustment of pH influenced the performance of alum obviously but not of p-DADMAC. High p-DADMAC dosage overwhelming the effects of alum is less affected by pH adjustment. The results of this investigation reveal that enhanced coagulation with p-DADMAC was founded to be very effective for removing high-molecular-weight THM precursors, i.e., humic acid and tannic acid, and markedly reduced the alum dosages required for turbidity removal. The other two polymers, i.e., cationic PAM and non-ionic PAM, which had higher molecular weight but lower charge density than p-DADMAC, were not capable of removing organic precursors. It was thus concluded that enhanced coagulation with polymer, p-DADMAC, could be considered as a promising technique for removal of NOMs with hydrophobic and higher-molar-mass (>1 K) in water treatment plants.

Original languageEnglish
Pages (from-to)1141-1150
Number of pages10
JournalChemosphere
Volume58
Issue number8
DOIs
Publication statusPublished - Feb 2005

Fingerprint

Coagulation
Polyelectrolytes
coagulation
Molecular Weight
Molecular weight
Polymers
Turbidity
polymer
Humic Substances
Hydroxybenzoates
turbidity
Pulse amplitude modulation
Acids
Tannins
acid
humic acid
Water treatment plants
Molar mass
Water Purification
research work

Keywords

  • Enhance coagulation
  • Humic acid
  • p-diallyldimethyl ammonium chloride
  • p-hydroxybenzoic acid
  • Polyacryamide
  • Polymer
  • Tannic acid
  • Trichloromethane (THM) formation

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Science(all)

Cite this

Chang, E. E., Chiang, P. C., Tang, W. Y., Chao, S. H., & Hsing, H. J. (2005). Effects of polyelectrolytes on reduction of model compounds via coagulation. Chemosphere, 58(8), 1141-1150. https://doi.org/10.1016/j.chemosphere.2004.08.008

Effects of polyelectrolytes on reduction of model compounds via coagulation. / Chang, E. E.; Chiang, Pen Chi; Tang, Wei Yan; Chao, Su Hei; Hsing, Hao Jan.

In: Chemosphere, Vol. 58, No. 8, 02.2005, p. 1141-1150.

Research output: Contribution to journalArticle

Chang, EE, Chiang, PC, Tang, WY, Chao, SH & Hsing, HJ 2005, 'Effects of polyelectrolytes on reduction of model compounds via coagulation', Chemosphere, vol. 58, no. 8, pp. 1141-1150. https://doi.org/10.1016/j.chemosphere.2004.08.008
Chang, E. E. ; Chiang, Pen Chi ; Tang, Wei Yan ; Chao, Su Hei ; Hsing, Hao Jan. / Effects of polyelectrolytes on reduction of model compounds via coagulation. In: Chemosphere. 2005 ; Vol. 58, No. 8. pp. 1141-1150.
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