Development of Optimal Poly-Alumino–Iron Sulphate Coagulant
Publication: Journal of Environmental Engineering
Volume 129, Issue 8
Abstract
An optimal prepolymerized inorganic coagulant, poly-alumino–iron sulphate (PAFS), was developed and examined for drinking water treatment. PAFS is a new type of prehydrolyzed metal–ion coagulant. An investigation of the conditions for preparing PAFS has been conducted using with as primary raw materials. Optimization of the preparation conditions of the PAFS involved variation of the total metal–ion concentration, oxidation temperature, the molar ratio of the oxidant to metal–ion, and the oxidation period. An evaluation of the coagulation performance with two types of test waters showed that selected PAFS coagulants achieved either a greater or similar removal in terms of percentages of color, absorbance and dissolved organic carbon in comparison with another polymeric coagulant, polyferric sulphate (PFS). However, both of these (PAFS and PFS) had a superior performance to ferric sulphate (FS) and aluminum sulphate (AS). Of particular significance was that PAFS achieved the lowest residual metal–ion concentrations, Fe and Al, in comparison with PFS, FS, and AS, respectively.
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Information
Published In
Journal of Environmental Engineering
Volume 129 • Issue 8 • August 2003
Pages: 699 - 708
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Mar 29, 2002
Accepted: Sep 6, 2002
Published online: Jul 15, 2003
Published in print: Aug 2003
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