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Phosphorus sorption capacity of different types of opoka

100%

Cucarella V., Zaleski T., Mazurek R.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2007

nr 38

11-18

The bedrock opoka has been lately reported as an appropriate reactive media for onsite wastewater treatment systems due to its high phosphorus (P) sorption capacity. However, variations on its chemical composition may affect its reactivity with P, therefore leading to a variable P removal effi ciency. In this paper, the P-sorption capacity of three different types of opoka from the region of Miechów, Poland, is reported. According to the silica and carbonate content, opoka samples were classifi ed as light--weight and heavy-weight opoka. When heated over 900°C, opoka showed a very high P-sorption capacity that was well correlated to its Ca content. P-sorption isotherms from batch experiments with an artifi cial P solution were plotted and fi tted to the Langmuir and Freundlich adsorption models. The Freundlich isotherm appeared to model better the P-sorption of light opoka and the Langmuir isotherm of heavy opoka, suggesting different dominating mechanisms of P-sorption by light and heavy opoka.

Characterization of opoka as a basis for its use in wastewater treatment

80%

Brogowski Z., Renman G.

Polish Journal of Environmental Studies

2004

tom 13

nr 1

Opoka, as a silica-calcite sedimentary rock, occurs in south-eastern Europe and Russia. Stratigraphical studies down to 8 m depth were performed in Bełżec, Poland, where samples were taken for further analyses. Vertical layers represented a heavy-weight opoka consisting of relatively more CaCO3 than the horizontal layers of lightweight opoka dominated by SiO2 . Opoka had a mean bulk density of 1.34 g/cm3, a porosity of 44.5 % and a specific surface area of 64 m2 /g. Opoka, especially after heated to over 900℃ can be used as reactive filter media for phosphorus removal. Maximum sorption capacity was 119.6 g PO4 -P/ kg. Element analysis of the rock did not reveal any anomaly from that expected, and it was concluded that its element content does not devaluate opoka as a sorbent used in ecological wastewater treatment .

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

1 Polish Journal of Environmental Studies

1 Brogowski Z.

1 Cucarella V.

1 Mazurek R.

1 Renman G.

1 Zaleski T.

1 2007

1 2004

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Phosphorus sorption capacity of different types of opoka

Characterization of opoka as a basis for its use in wastewater treatment