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Study of the scale inhibition by HEDP in a channel flow cell using a quartz crystal microbalance
Abstract
An electrochemical quartz crystal microbalance apparatus was inserted in a channel flow cell in order to allow insitu electrochemical and gravimetric measurements in well-defined electrolyte tube flowing conditions. An expression of the mass transfer towards the electrode was established where the diffusion-limited current is a function of Re1/3 in the laminar regime and was verified experimentally using the redox couples Fe[CN]6 4- /Fe[CN]64- and O2/OH- This hydrodynamically controlled experimental device was developed to investigate scale deposit processes and to evaluate scale inhibitor efficiency. Experiments were performed on a mineral water at different flow rates; in the laminar regime, an increase in the flow rate accelerates the scaling process. The inhibiting properties of a well-known phosphonate (HEDP) were studied and the efficiency of this antiscale additive was tested at different concentrations and an optimum concentration could be established (0.7 mg dm − 3). The effect of inhibitor injection during the scale formation could also be evaluated as well as the influence of flow rate on the inhibiting efficiency.HEDP has shown a strong effect on inhibiting crystal growth and that affected the morphology of CaCO3 crystals as well as the coverage of the metallic surface.
Keywords: Scale inhibitor , HEDP, antiscale additive
Study of the scale inhibition by HEDP in a channel flow cell using a quartz crystal microbalance