Abstract: It is difficult to purify the sulfur-containing sewage of delayed coking unit using common technology. In response to this situation, a ceramic membrane with appropriate pore size was selected based on the particle size distribution of a refinery sulfur-containing sewage. A series of purification experimentations were done using single tube ceramic membrane. The filtration results show that the average size of the particle is above 0.5 μm and most of them are concentrated in the range of 20-250 μm. A ceramic membrane with filtering accuracy of 0.05 μm can meet the requirement, by which the average turbidity of sulfur-containing sewage from delayed coking is reduced by more than 99% after filtration and purification and the average oil removal rate is 96.51%, the permeability can be recovered to 0.3 mL/(m2?h?Pa). The industrial side line test shows that the average oil removal rate is more than 95%, solids content, such as coke powder, is less than 30 mg/L, and the turbidity reduced more than 98%. The purification device runs stably and the permeability recoveries well after regular cleaning.

Key words: new ceramic membrane, Filtration and purification, delayed coking, sulfur-containing sewage