Kinetic conditions of struvite continuous reaction crystallisation from wastewater in presence of aluminium(III) and iron(III) ions Online publication date: Mon, 06-May-2019
by Nina Hutnik; Anna Stanclik; Krzysztof Piotrowski; Andrzej Matynia
International Journal of Environment and Pollution (IJEP), Vol. 64, No. 4, 2018
Abstract: Kinetic parameters of the continuous struvite reaction crystallisation process from aqueous solutions containing phosphate(V) ions with impurities: aluminium(III) or/and iron(III) ions were determined. A simplified kinetic model of ideal mixed suspension mixed product removal (MSMPR) crystalliser - size independent growth (SIG) was adopted. Nuclei population densities, nucleation rates and crystal linear growth rates were determined from product crystal size distributions. It was concluded that within the assumed process parameter ranges, the linear growth rate of struvite crystals in presence of aluminium(III) ions varied from 4.53 · 10−9 to 1.89 · 10−8 m/s, whereas in presence of iron(III) ions it was within the 4.59 · 10−9 − 1.62 · 10−8 m/s range. Nucleation rate varied within the 3.8 · 107 − 1.6 · 109 1/(sm3) and 4.5 · 107 − 1.2 · 109 1/(sm3) ranges, correspondingly. These large differences show significant influence of impurities and technological parameters on the struvite reaction crystallisation kinetics, thus on the product quality. It was experimentally demonstrated that aluminium(III) ions affect struvite reaction crystallisation more advantageously than iron(III) ions.
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Environment and Pollution (IJEP):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com