Development and Application of a New Sulfur Dioxide Sorbent Based on Sewage Sludge

Sewage sludge-derived materials and two sorts of industrial solid waste were used to produce a sorbent for sulfur dioxide adsorption at low concentration. The sulfur dioxide capacity was measured according to a laboratory-developed breakthrough test. Uniform Design Method was used to formulate the different ratios of the three main raw materials and the desulfurizer HN04 was chosen as the optimal sorbent due to the highest sulfur dioxide capacity 8.8 mg·g^-1 and the largest BET 13.1771 m²·g^-1. The effects of a few conditions on the SO₂ removal behavior of the sorbent were studied. The results evince that the sorbent HN04 under the best conditions of 5714 mg·m^-3 inlet SO₂ concentration, 2000h^-1 space velocity and 473K desulfurization temperature in steam has the maximum breakthrough sulfur dioxide capacity 9.7 mg·g^-1.