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

• Autorzy: Matynia A. , Mazieńczuk A. , Piotrowski K. , Wierzbowska B. , Hutnik N. , Kozik A.
• Języki publikacji: EN

Abstrakty

EN

Experimental tests covering the production of struvite MgNH4PO4ź6H2O 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 1.45ź10-8 m/s (pH 9, τ 900 s) to 2.06ź10-9 m/s (pH 11, τ 3600 s) while the nucleation rate from 5.1ź10^7 to 3.2ź10^9 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%.

Słowa kluczowe

EN

continuous DTM crystallizer; jet pump; compressed air; reaction crystallization; phosphates(V) removal; struvite; crystal size distribution; SIG kinetic model

PL

krystalizator DTM; strumienica; sprężone powietrze; krystalizacja; usuwanie fosforanów; struwit; rozkład miarowy kryształów; model kinetyczny

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2011
• Tom: Vol. 13, nr 2
• Strony: 46--53
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Matynia A.

autor

Mazieńczuk A.

autor

Piotrowski K.

autor

Wierzbowska B.

autor

Hutnik N.

autor

Kozik A.

• Wrocław University of Technology, Faculty of Chemistry, Wybrzeże Wyspiańskiego 27, 50370 Wrocław,

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