Synthesis, Characterisation And Application In
Coagulation Experiments Of Polyferric Sulphate
Author(s)
A. Zouboulis, V. Fotini & M. Panagiotis
Abstract
The process of coagulation is a core environmental protection technology, which
is mainly used in the wastewater treatment facilities. Research is now focused on
the development of new inorganic coagulants. A characteristic example is PFS
(polyferric sulphate), a relatively new pre-polymerised inorganic coagulant with
high cationic charge. It consists of medium and high molecular weight polymeric
chains and it can be described with the chemical formula [Fe2(OH)n(SO4)(6-n)/2]m.
In this paper, the role of some parameters including temperature, types of
chemical reagents etc in the preparation stages of PFS were investigated.
Furthermore, the prepared PFS was characterized based on typical properties
such as the percentage of the polymerised iron present in the compound etc.
Furthermore, dynamics of coagulation process were examined by means of the
Photometric Dispersion Analyzer (PDA). Finally, the coagulation performance
of PFS in reducing the turbidity of synthetic kaolinite suspensions was studied.
Keywords: coagulation, polyferric sulphate, inorganic polymeric coagulant, prepolymerised
coagulant.
1 Introduction
The process of coagulation is widely used in the wastewater treatment facilities
especially for the destabilisation of colloids suspensions and for the removal of
suspended solids along with the removal of phosphate ions. It is known as a core
environmental protection technology. Nearly all the colloids found in natural
waters carry negative charge and therefore, they remain in suspension, due to the
mutual electric repulsions. Therefore, the addition of a cation will result in
colloidal destabilisation, as they specifically interact with the negatively charged
colloids and neutralise their charge. Highly charged cation, such as Fe3+, is
Keywords
coagulation, polyferric sulphate, inorganic polymeric coagulant, prepolymerised
coagulant.
Related Book
Other papers in this volume
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