Activated carbon derived from sewage sludge was impregnated in nitrate solution to produce a sorbent for sulfur dioxide adsorption at low concentration. The sulfur dioxide capacity was measured according to a laboratory-designed breakthrough test. After adsorption experiments on sulfur dioxide, desulfurizer JZ-Ni was chosen as the optimal sorbent owing to its largest sulfur dioxide capacity 57.6 mg•g-1 and the highest BET 210.3031 m2•g -1. The effects of a few conditions on SO2 removal behavior of the sorbent were studied. The results show that the sorbent JZ-Ni under the best conditions of 5714 mg•m-3 inlet SO2 concentration, 2000h-1 space velocity and 393K desulfurization temperature, 0.3 mm particle diameter in steam has the maximum breakthrough sulfur dioxide capacity 58.2 mg•g-1 .