Martti Aho , Jouni Tummavuori

Turpeen ioninvaihto-ominaisuuksista. Osa IV: Koeolosuhteiden vaikutus turpeen ioninvaihtokykyyn

Aho M., Tummavuori J. Turpeen ioninvaihto-ominaisuuksista. Osa IV: Koeolosuhteiden vaikutus turpeen ioninvaihtokykyyn.

Tiivistelmä

The effects of experimental conditions on the ion exchange capacity of a column-shaped peat layer were studied. To make sure that the results were universal the columns were prepared from two peat types with strongly different cation adsorption capacities. The cation used was Cu2+. An increase in pH increased strongly the adsorption capacities in the pH range 1—5. Below the level of 200 ppm Cu2+ the capacity was to some extent dependent on concentration. Because of the rapidity of adsorption the flow rate and column height had practically no effect on the capacity. The use of peat as an ion exchanger was studied by using a larger column prepared from the low-moor peat sample. The capacity was near the value reached with the smaller column and it remained nearly constant after repeated copper-adsorptions, elutions and washings. The maximum flow rate decreased in the beginning and reached a constant level rather soon. The peat column worked like an ion exchange resin but the capacity was smaller. The results give an impetus to the use of larger peat columns made from selected, low moor peat for heavy metal filtration.

Vastaanotettu 31.10.2017 Julkaistu 1.1.1984

Katselukerrat 1462

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