New crystallizers with a compressed air-driven jet pump in the process of precipitating struvite from diluted water solutions containing phosphate ions
Journal Title: CHEMIK nauka-technika-rynek - Year 2010, Vol 64, Issue 11
Abstract
Continuous reaction crystallization of struvite from water solutions containing 0.2 or 1.0 mass % of phosphate(V) ions was investigated. Stoichiometric proportions between PO4 3–, Mg2+ and NH4 + ions were kept. Properly formed struvite crystals of mean size 14 – 41 μm were produced. Increase in process environment pH from 9 to 11 resulted in nearly two–time decrease in mean crystal size. Elongation of mean residence time from 900 to 3600 s corresponded to advantageous increase in this size by ca. 50%. Kinetic parameter values of struvite reaction crystallization in both crystallizer constructions were determined.
Authors and Affiliations
Andrzej Matynia, Agata Mazieńczuk, Bogusława Wierzbowska, Anna Kozik, Krzysztof Piotrowski
Keywords
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