Abstract—Experimental results concerning continuous process of phosphate(V) ions recovery from synthetic animal breeding wastewater were presented. It was concluded, that phosphate(V) ions precipitated as sparingly soluble salts: amorphous calcium phosphate(V) (above 70% in a product) and struvite (below 30%). Solid product contained also impurities, mainly in the form of co-precipitated sparingly soluble metal hydroxides. Product size did not exceed 80 μm. Its mean size varied from ca. 15 to ca. 18 μm. Population homogeneity was moderate, with high agglomeration effects. Excess of magnesium ions in relation to phosphate(V) ions concentration (molar ratio 1.2 : 1) in a feed influenced process course and its results advantageously. Struvite content in a product increased more than 20%. Product size also enlarged – mean size was ca. 17% larger.
Index Terms—Struvite, synthetic animal breeding wastewater, continuous reaction crystallization, DT MSMPR crystallizer, product quality, phosphorus recycling.
A. Kozik, N. Hutnik, B. Wierzbowska, and A. Matynia are with the Faculty of Chemistry, Wroclaw University of Technology, Wroclaw, Poland (e-mail: anna.kozik@pwr.edu.pl, nina.hutnik@pwr.edu.pl, boguslawa.wierzbowska @pwr.edu.pl, andrzej.matynia@pwr.edu.pl).
K. Piotrowski is with Department of Chemical Engineering and Process Design, Silesian University of Technology, Gliwice, Poland (e-mail: krzysztof.piotrowski@polsl.pl).
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Cite: Anna Kozik, Nina Hutnik, Boguslawa Wierzbowska, Krzysztof Piotrowski, and Andrzej Matynia, "Recovery of Struvite from Synthetic Animal Wastewater by Continuous Reaction Crystallization Process," International Journal of Chemical Engineering and Applications vol. 7, no. 1, pp. 47-51, 2016.
