J Water SRT - Aqua 47 (1998) 21-29

Effects of iron and manganese on the scaling potentiality of water

B. Pernot, M. Euvrard and P. Simon

Equipe Chimie des Eaux, Laboratoire de Corrosion et Traitements de Surface (EA no. 476), Faculté des Sciences et Techniques, 25030 Besancon Cedex, France

Equipe Chimie des Eaux, Laboratoire de Corrosion et Traitements de Surface (EA no. 476), Faculté des Sciences et Techniques, 25030 Besancon Cedex, France

S.A.U.R., Centre Pierre Crussard, 2 rue de la Bresle, 78312 Maurepas Cedex, France

This paper presents a study of the influence of the mineral composition of water on its scaling potentiality. The importance of two metallic cations was studied: Fe(II) and Mn(II), which are often present in water. The water was prepared as either doped or not with the cation under study. The chosen concentrations were 0.2 or 2 mg/L for Fe(II) and 0.05 or 0.38 mg/L for Mn(II). Analytical tests were applied to the water with or without the metallic cation: doped water or control water. By comparison, it was possible to determine the significance of Fe(II) or Mn(II) in the crystallisation of calcium carbonate. Scaling risks were reduced when iron was present in the water–it brought about an increase in the formation of fine particles in the liquid. Unlike Fe(II), Mn(II) did not have a significant effect on the scaling power of the water.

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