Abstract
This research aims to recover activated carbon to absorb the calcium ions in hard water. These seeds produce charcoal stoves that burn biomass with coal temperature 350-400◦C a size appropriate to condition the surface of activated carbon with a solution of potassium permanganate Cooper. To absorb calcium ions in hard water until saturated. Then find a suitable solution to restore the activated carbon. And monitor the performance of activated carbon to absorb the recovery already. The results showed that coal from longan seed through conditioning the surface with a solution of potassium permanganate Spurs 1-2 mm size, the best performance in absorbing calcium ions in hard water. Which can absorb the calcium ion saturation up 99.80% from the recovery activated carbon adsorption of calcium ions through the saturated solution NaCl2.5% w / v as eluent the best performance in the process. Recovered Chemical Followed by the solution and the solution NaOH0.01 M H3PO4 0.01 M, respectively, to ensure the effectiveness of activated carbon that has been restored with a solution NaCl2.5% w / v found that the activated carbon from seed. longan can be re-absorb calcium ions again. The percentage adsorption maximum 99.5
Keywords: activated carbon adsorption of calcium ions from hard water conditions.
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