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2011 | 13 | 2 | 46-53

Article title

Reaction crystallization of struvite in a continuous DTM type crystallizer with a compressed air driven jet pump

Content

Title variants

Languages of publication

EN

Abstracts

EN
Experimental tests covering the production of struvite MgNH4PO4·6H2O from water solutions containing 1.0 mass % of phosphate(V) ions using magnesium and ammonium ions in stoichiometric proportions were carried out in a crystallizer of 1.2 dm3 working volume. The process temperature was 298 K. Struvite crystals of mean size Lm from ca. 14 to ca. 38 μm were produced depending on the process environment's pH (9-11) and the mean residence time of suspension in a crystallizer, τ (900-3600 s). In such defined process conditions the linear growth rate of struvite crystals changed from 1.45·10-8 m/s (pH 9, τ 900 s) to 2.06·10-9 m/s (pH 11, τ 3600 s) while the nucleation rate from 5.1·107 to 3.2·109 1/(sm3). Crystal product of the most advantageous granular characteristics was produced at pH 9 and the mean residence time 3600 s. Within this product population the largest sizes reached above 200 μm while the number of crystals smaller than 3 mm was kept below 6%.

Publisher

Year

Volume

13

Issue

2

Pages

46-53

Physical description

Dates

published
1 - 1 - 2011
online
16 - 6 - 2011

Contributors

  • Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
  • Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
  • Department of Chemical & Process Engineering, Silesian University of Technology, ks. M. Strzody 7, 44-101 Gliwice, Poland
  • Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
author
  • Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
author
  • Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

References

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  • Koralewska, J., Piotrowski, K., Wierzbowska, B. & Matynia, A. (2007). Reaction-crystallization of struvite in a continuous liquid jet pump DTM MSMPR crystallizer with upward circulation of suspension in a mixing chamber - an SDG kinetic approach. Chem. Eng. Technol. 30, 1576-1583. DOI: 10.1002/ceat.200700229.[Crossref][WoS]
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  • Matynia, A., Piotrowski, K., Ciesielski, T. & Liszka, R. (2009). New constructions of crystallizer with a compressed air driven jet-pump in the phosphorus recycling technology. Przem. Chem. 88, 505-508 (in Polish).
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  • Matynia, A., Mazieńczuk, A., Wierzbowska, B., Kozik, A. & Piotrowski, K. (2010). New crystallizers with a compressed air-driven jet pump in the process of precipitating struvite from diluted water solutions containing phosphate ions. Chemik 64, 753-758.

Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_v10026-011-0023-8
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