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Usuwanie chromu (VI) na węglu aktywnym regenerowanym węglanem sodu

Lach J., Dębowski Z., Ociepa E.

Ochrona Środowiska

2000

nr 3

3-6

Investigated was the potentiality of using sodium carbonate for the regeneration of activated carbons spent in the course of chromate onion desorption. The experiments were carried out on WD-extra carbon treated with muriatic acid for partial removal of ash particles. The regeneration procedure involved sodium carbonate and was conducted in a through-flow system. The desorption and sorption effects were related to three values of Na2CO3 concentration (2,5 and 10%) and two values of flow velocity (2 and 4 m/h). The best sorption effects were achieved on carbon regenerated with the 2% Na2CO3 solution. When use was made of increased (5% or 10%) sodium carbonate concentrations, consecutive sorptions were less effective. This finding, however, cannot be explained by the amount of the desorbed chromium. The sorption effects following the regeneration procedure were found to be adversely influenced by the local increase of pH in the micropores of the activated carbon. Of importance was also the overall number of the regeneration procedures performed. Each successive procedure reduced noticeably the adsorbing capacity of the carbon with respect to chromate onion. The contribution of flow velocity to the sorption effect was less distinct. However, the flow velocity of the Na2CO3 solution contributed markedly to the duration of the regenerating procedure and to the quantity of the reagent to be used. Thus, at the flow velocity of 2 m/h, the length of regeneration increased, whereas the quantity of the sodium carbonate used decreased.