Mechanism of P-PO4 removal from chemically treated waste water

• Autorzy: Smoczyński L. , Dłużyńska K.T. , Pierożyński B. , Wardzyński R. , Załęska-Chróst B. , Zaborowska-Piworowicz A.A.

Warianty tytułu

PL

Mechanizm usuwania P-PO4 ze ścieków oczyszczanych chemicznie

• Języki publikacji: EN

Abstrakty

EN

The coagulation-flocculation of model wastewater was studied to compare the coagulation performance of PAC, Al2(SO4)3 and PIX. The proposed hypothesis that the amount of a coagulant bas to be precisely determined based on the condition of the minimum of the parabola dx = 0 was confirmed for aluminum coagulants. It was found that the dose of PIX should be calculated using the coordinates of the point of intersection of appropriate straight lines. Then the mechanism of phosphorus removal from model wastewater was examined under conditions of the optimum (constant) coagulant dose. The AI:P molar ratio obtained in the study enabled to exclude the possibility of chemical precipitation of any aluminum orthophosphate. The determination coefficient R2 for a converted equation of the Langmuir adsorption isotherm indicated chemical nature of orthophosphate (adsorbate) binding by colloidal micelles of Al{OH}3 and Fe{OH}3 (adsorbent). Finally, the adsorption equilibrium constant and maximum adsorption capacity were suggested for the sorption process under consideration.

PL

Porównano zdolność koagulacyjną PAC-u, Al2(SO4)3 i PIX-u w ściekach modelowych. Dla koagulantów glinowych potwierdzono słuszność nowej koncepcji dokładnego obliczania ilości koagulantu z warunku minimum paraboli dx = 0. Stwierdzono, że dawkę PIX-u należy obliczać ze współrzędnych przecięcia odpowiednich prostych. W warunkach "dawki optymalnej" koagulantu badano mechanizm usuwania fosforu z koagulowanych ścieków modelowych. Wartości współczynnika determinacji R2 dla skonwertowanego równania izotermy adsorpcji Langmuira wskazały na chemiczny charakter wiązania fosforanów(V) przez koloidalne micele {Al(OH)3} i {Fe(OH)3}. W konsekwencji takiej konkluzji określono stałą równowagi i "adsorpcję maksymalną" dla badanego procesu sorpcji. Ustalona molowa zależność AI:P wykluczyła chemiczne wytrącanie osadu jakiegokolwiek fosforanu(V) glinu.

Słowa kluczowe

EN

wastewater treatment; coagulation; inorganic chemicals; phosphate; COD

PL

koagulacja-flokulacja; nieorganiczne sorbenty koloidalne; ścieki modelowe; sorpcja fosforanów

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Ecological Chemistry and Engineering. A
• Rocznik: 2009
• Tom: Vol. 16, nr 1-2
• Strony: 135--149
• Opis fizyczny: Bibliogr. 25 poz., rys., tab.

Twórcy

autor

Smoczyński L.

autor

Dłużyńska K.T.

autor

Pierożyński B.

autor

Wardzyński R.

autor

Załęska-Chróst B.

autor

Zaborowska-Piworowicz A.A.

• Department of Chemistry, University of Warmia and Mazury in Olsztyn, pl. Łódzki 4, 10-957 Olsztyn,

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