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1
Content available remote Związki boru, kobaltu, manganu i molibdenu w procesie odzyskiwania fosforanów ze ścieków z hodowli zwierząt
Hutnik N., Stanclik A., Piotrowski K.
Przemysł Chemiczny
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2018
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T. 97, nr 2
294--298
PL
Wydzielano struwit w sposób ciągły z wodnych roztworów fosforanów zawierających także charakterystyczne składniki obecne w gnojowicy: bor, kobalt, mangan i molibden. Wykazano, że bor, kobalt i molibden, w przeciwieństwie do manganu, sprzyjały otrzymywaniu dobrze wykształconych kryształów struwitu. Kobalt i molibden nie zmieniały standardowego pokroju kryształów struwitu (La/Lb ok. 6), ale mangan i bor (obecne w układzie procesowym) zwiększały te proporcje geometryczne odpowiednio do 7,7, a nawet do 9,1. Krystalizacja struwitu przebiegała najlepiej w obecności boru. Liniowa szybkość wzrostu wyniosła ponad 2·10-8 m/s, a szybkość zarodkowania była mniejsza niż 2·108 1/(s·m3). Kobalt i mangan wydzieliły się jako wodorotlenki, a ich zawartość w fazie stałej wynosiła odpowiednio 393 mg/kg i 749 mg/kg.
EN
Struvite was continuously pptd. from aq. solns. of phosphates in presence of B, Co, Mn and Mo salts contained in liq. manure. The B, Co and Mo compds. (in contrast to Mn compds.) favored well-formed struvite crystals. Neither Co nor Mo changed the std. geometrical proportions of struvite crystals, while Mn and B increased the proportions. Struvite crystn. run well in the presence of B. The linear growth rate was more than 2·10-8 m/s, and the nucleation rate was less than 2·108 1/(s·m3). Co and Mn were sepd. as hydroxides and their content in solid phase was 393 mg/kg and 749 mg/kg Mn, resp.
2
Content available Application of struvite process for nutrient recovery from anaerobic digesters of livestock wastewater
Zhang T., Fang C., Li P., Jiang R.
Environment Protection Engineering
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2014
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Vol. 40, nr 3
29--42
EN
Process of struvite (Mg4NH4PO4·6H2O) precipitation is a promising method for phosphorus recycling. The use of cheap magnesium ore for precipitation struvite as phosphate recovery has been examined. The optimal conditions for precipitation are pH 9.0 and Mg2+: NH4 +: PO4 -3 molar ratio 1.1:30.7:1. Linear correlation of experimental data is in qualitative agreement with modelling calculation. Surface characterization analysis demonstrates that struvite is the dominant component of precipitate. Fertility value tests show that struvite precipitate could be available as slow-release fertilizer.
3
Content available remote Studies on the processes relating to the reduction of fertilizers manufacturing and their influence on the environment
Grzmil B.
Polish Journal of Chemical Technology
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2005
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Vol. 7, nr 3
49-55
EN
The influence of fertilizers manufacturing and their application on the environment has been discussed. The necessity of curbing the negative impact of their production and application was pointed out. The studies conducted at the Institute of Inorganic Chemical Technology and the Environment Engineering at the Technical University of Szczecin, were thoroughly examined. The research regarded the production of solid and liquid mineral fertilizers demonstrating a variety of characteristics, the use of the side effects with a view to obtaining potassium fertilizers, as well as the recovery of phosphates from sewage in the form of useful products.
4
Content available remote Studies on magnesium-ammonium phosphate recovery from wastewater
Grzmil B., Wronkowski J.
Polish Journal of Chemical Technology
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2004
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Vol. 6, nr 3
13-15
EN
During the conducted research, several factors were described as having influenced magnesium ammonium phosphate recovery from the model solution and the effluents of the wet process phosphoric acid production. The factors comprised the pH (8.5-11), the molar ratio Mg2+:NH4+:PO4(3-) and the presence of fluorides. It was established that the process of MgNH4PO4 6H2O precipitation should be carried out at the pH 10.5 - 11, and the molar ratio Mg2+ : NH4+ : PO4(3-) 1.8 : 1.1. The possibility of distributive phosphates precipitation as struvite and the fluorides as CaF2, was determined.
5
Content available remote Możliwości konwersji fosforanu żelaza do fosforanów sodu lub wapnia
Jodko M., Kowalski Z.
Czasopismo Techniczne. Chemia
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2001
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R. 98, z. 4-Ch
6--15
EN
This work presents research results on the conversion of ferric and aluminium phosphates into sodium and calcium phosphates. This solution gives a chance on the method of indirect recovery of phosphorus compound from the waste. The use of proposed method allows to increase phosphorus concentration in solution from the conversion 5,000 times in comparison to its concentration in sewage.
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