Performance and mechanism of polyferric-quaternary ammonium salt composite flocculants in treating high organic matter and high alkalinity surface water

A series of composite flocculants PFC–PD with different basicity ( B) of polyferric chloride (PFC), different weight percentage ( w ( P ) ) and intrinsic viscosity ( η) of polydimethyl diallylammonium chloride (PDMDAAC) were prepared by prepolymerization. The turbidity, dissolved organic carbon (DOC...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-06, Vol.165 (1), p.789-795
Main Authors: Wei, J.C., Gao, B.Y., Yue, Q.Y., Wang, Y., Lu, L.
Format: Article
Language:English
Subjects:
Applied sciences
Coagulation mechanism
Composite flocculant
Continental surface waters
Exact sciences and technology
Ferric Compounds - chemistry
Flocculation
Fresh Water
Hydrogen-Ion Concentration
Natural water pollution
Organic Chemicals - isolation & purification
Pollution
Quaternary Ammonium Compounds - chemistry
Surface water treatment
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
Water treatment and pollution
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Summary:A series of composite flocculants PFC–PD with different basicity ( B) of polyferric chloride (PFC), different weight percentage ( w ( P ) ) and intrinsic viscosity ( η) of polydimethyl diallylammonium chloride (PDMDAAC) were prepared by prepolymerization. The turbidity, dissolved organic carbon (DOC) and specific ultraviolet absorbance (SUVA) removal efficiency as well as flocculation mechanism of PFC–PD were compared with that of PFC, PDMDAAC and successive addition of PFC and PDMDAAC in treating high DOC and high alkalinity surface water by jar tests. The effect of B, w ( P ) and η on coagulation efficiency and mechanisms were also studied. The experimental results showed that PFC–PD was more efficient and more applicable for turbidity, DOC and SUVA removal than PFC, PDMDAAC and successive addition of PFC and PDMDAAC. Further, the water pH was slightly depressed by PFC–PD. Coagulation efficiency of PFC–PD was improved at lower B, larger w ( P ) and larger η. Charge neutralization was dominant mechanism of PFC–PD.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2008.10.069