Abstract

While new coagulants are able to remove more contaminants and reach higher removal efficiency, basic coagulation performance, such as turbidity removal and floc settling, is also considered in the process evaluation. Here, we systematically evaluated the performance of a novel covalently-bound hybrid coagulant (CBHyC) in natural surface water coagulation using jar test. Size-exclusion chromatography coupled with online organic carbon detection (SEC-DOC), fluorescence excitation emission matrix (EEM), acid-base titration and zeta potential analysis were used to characterize the behaviors of CBHyC coagulation. Compared with metal-based coagulants, CBHyC has better settling properties and removes more turbidity. Across a range of dosages, the CBHyC formulation with higher zeta potential achieved better removal of natural organic matter (NOM) and resulted in less of a pH change. Total dissolved nitrogen decreased 37% with CBHyC coagulation. CBHyC can remove both low molecular weight (LMW) organics and high molecular weight components. The interaction between quaternary ammonium plus phenolic and carboxylic groups is likely responsible for the removal of LMW and nitrogenous organics, and thus CBHyC removed more NOM than conventional coagulants. In summary, CBHyC performs better than conventional coagulants for removing turbidity and NOM and also overcomes emerging needs to remove LMW and nitrogenous organics.

LanguageEnglish (US)
Pages322-328
Number of pages7
JournalSeparation and Purification Technology
Volume192
DOIs
StatePublished - Feb 9 2018

Fingerprint

Coagulants
Coagulation
Water treatment
Surface waters
Turbidity
Molecular weight
Biological materials
Zeta potential
Size exclusion chromatography
Organic carbon
Titration
Fluorescence
Impurities
Nitrogen
Acids
Metals
Ammonium Compounds

Keywords

  • Coagulation
  • Dissolved organic nitrogen
  • Natural organic matter
  • Turbidity
  • Water treatment

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

Cite this

Coagulation behaviors of new covalently bound hybrid coagulants (CBHyC) in surface water treatment. / Chen, Si; Yuan, Ziwen; Hanigan, David; Westerhoff, Paul; Zhao, Huazhang; Ni, Jinren.

In: Separation and Purification Technology, Vol. 192, 09.02.2018, p. 322-328.

Research output: Contribution to journalArticle

Chen, Si ; Yuan, Ziwen ; Hanigan, David ; Westerhoff, Paul ; Zhao, Huazhang ; Ni, Jinren. / Coagulation behaviors of new covalently bound hybrid coagulants (CBHyC) in surface water treatment. In: Separation and Purification Technology. 2018 ; Vol. 192. pp. 322-328
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