Undoubtedly, the most important challenge in the coming decades is to access sustainable and high quality water resources. However, several pollutants are contaminating water resources. Among contaminants, heavy metals are of great importance due to long-term persistence in environment. Although application of activated carbon due to high porosity and specific surface area (600 to 2000 m 2 /g), serves as one of the effective methods for removing heavy metals from aqueous solutions, but it is not cost-effective. Accordingly, in recent years, many researches have been produced and introduced a low-cost adsorbent. In the meantime, plant residues and agricultural waste material due to low cost and easy access have been perceived as good alternative in this area. The present research deals with feasibility of biochar produced from pistachios hard-shell, as an adsorbent to remove lead (Pb) from aqueous solutions. Experiments were performed in a continuous and discontinuous methods. In batch experiments, biochar potential as an adsorbent in initial changes in the concentration, amount of adsorbent, contact time, and pH of dissolved pollutants was determined. The maximum rate of lead adsorbed by biochar for pollutants solution in batch with pH 5.5 in optimum adsorbent and pollutant contact time and the initial concentrations of 10 mg/L was found to be 7.49 mg/g. The adsorption rate after 24 hours was 8.41 mg/g. In order to characterize the biochar, the FTIR, SEM, BET and CHNSO methods were used. According to BET specific surface area for biochar was estimated about 442 m 2 /g. Pseudo-first-order kinetic model and Exponential function have good ability to predict the lead adsorbed by biochar. In order to complete studies on adsorbent, columnar tests were conducted by taking three levels 2,3 and 4 mL/min flow rate through the column and 3 different amounts of adsorbent, 2, 3 and 4 cm into account.The maximum amount of lead adsorbed by biochar under batch condition was obtained in flow 3 mL/min, adsorbing height of 2 cm and an initial concentration of 10 mg/L, equivalent to 3.91 mg/g. Given determination coefficients R 2 obtained from models Thomas, Yoon-Nelson, Dose Response datafrom column tests in all three models predicted the adsorption process efficiently. Under continuous condition, lead removal rates, at best was reduced 54% compared to the discrete one. Keywords: biochar, lead, absorption, B atch experiment, column experiment