Discharge and Disposal of Coal Gasification Methanol Production Residue and Distribution Characteristics of PAHs in it

Abstract

To determine the quantities and the treatment ways of coal gasification methanol production residues, questionnaire survey and field investigation were carried out in this research. Moreover, the distribution characteristics of PAHs in two typical residues were determined by GC-MS technique, according to USEPA8100 method. The outputs of gasifier slag and boiler ash for were 127,494 t/a and 164,850t/a, respectively, all the boiler ash and 80% of the gasifier slag would be reused for brick-making. Coal tar residue, with the yield of 480 t/a, was always delivered to coke plant for coking, which was a effective measure to save energy and solve the environmental issues caused by the storage of this residue. The results indicated that the concentration of PAHs with 5-6 aromatic rings was 905 mg/kg in coal tar residue, accounting for 9.23% of the total PAHs concentration, its Benzo (a) pyrene concentration was 160 mg/kg, making it a major health hazard. The concentration of PAHs in gasifier slag was 189mg/kg and the PAHs with 2-3 aromatic rings accounted as high as 81.41% of the total PAHs concentration, the PAHs with 5-6 aromatic rings made up only 1.1%. TheBaPeq were 322.9 mg/kg and 0.23 mg/kg for coal tar residue and gasifier slag, respectively.