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Adsorption is one alternative that is used to reduce lead (Pb) at low concentrations. Activated charcoal from Dendrocalamus asper (Schult) known as local name “Bambu Betung” has better performance in low concentration Pb adsorption at the liquid waste. The activation by added Na2CO3 was carried out for 24 hours and followed by neutralization of the filtrate until it reaches pH 7. Determination of optimum adsorption using adsorbent weight, adsorbate pH and contact time was treated concurrently including the design of surface method response statistics central composite design (RSM CCD). An optimal condition conducted to obtain these adsorption Langmuir and Freundlich isothermal mechanism. CCD processing was managed to obtained optimum conditions of pH, weight, and time. The results of the isothermal equation were in accordance with the Langmuir model because the absorption model has given an r value of 0.998 through the Langmuir equation y = 0.047x + 0.009. Overall, the optimum adsorption capacity of activated charcoal from D.asper (Schult) was performed at 21.28 mg per gram adsorbent. Based on the characteristics of betung bamboo activated charcoal test using SEM-EDX it was shown that there was no contamination of lead ion, this is the same as activated charcoal in general.