Sulphur-based autotrophic denitrification was applied to treat the low concentration nitrate-contaminated water.Different electron donors,namely,elemental sulfur,sulfide and thiosulfate,were used in three continuous reactors to compare the denitrification performance.When treating the low concentration nitrate-contaminated water(13 mg·L-1),the thiosulfate system showed the best performance and the sulfide system was the worst.The thiosulfate system was less sensitive to low temperature than the other two.At...