The performance of a polymaleic-based polymeric scale inhibitor on CaCO3 inhibition under different water quality variables

• Published in: Desalination and water treatment 2017-08, Vol.85, p.36-45
• Main Authors: Wang, Liang-Chen, Zhang, Qiao-Ling, Wang, Lu, Wang, Liang-Bi, Wang, Xiao-Jian, Ju, Xue-Song, Cui, Kai, Zhu, Chen-Guo
• Format: Article
• Language: English
• Subjects: Calcium carbonate scale; Hydrolysis polymaleic acid; Recirculation cooling water; Static test; Water quality
• ISSN: 1944-3986
• DOI: 10.5004/dwt.2017.21280

To investigate the performance of a polymaleic-based polymeric scale inhibitor against CaCO3 scale under different water quality, hydrolyzed polymaleic acid (HPMA) is used. The influences of ions (Mg2+, SO4 2–, O4 3–, SiO3 2–, Cl– and H+) on the performance of HPMA against CaCO3 scale are investigated by conducting tatic test. The effect of the mass ratio (β = [HPMA]/[CaCO3]) on the performance of HPMA against CaCO3 cale is also studied. The effect of HPMA on the crystals of CaCO3 is examined using scanning electron icroscopy (SEM). The results can be summarized as follows: the effect of β on the performance of HPMA gainst aCO3 scale mainly depends on CaCO3 concentration; the presence of Mg2+, SO4 2–, PO4 3– and SiO3 2– can hange adsorption equilibrium of carboxyl ion of HPMA onto the CaCO3 crystal growth sites; both SO4 2– and iO3 2– can enhance the performance of HPMA, but SiO3 2– causes performance declining in the presence of O4 3–; the presence of PO4 3– and Mg2+ may weaken the perfor- mance; Cl– can improve the performance and his effect increases with increasing Cl– concentration; pH value has a remarkable influence on the performance; EM morphologies of CaCO3 scale are distorted with dosage of HPMA; Ca–HPMA formation is confirmed using Fourier transform infrared spectra.