Method for improving denitrification effect of sewage treatment

The invention belongs to the technical field of sewage treatment, and particularly relates to a method for improving the denitrification effect of sewage treatment, and the method specifically comprises the following steps: S1, mixing a bioethanol vinasse liquid extract with wastewater of a sewage treatment anaerobic section of an urban sewage treatment plant to obtain mixed wastewater; and S2, treating the mixed wastewater. According to the method for improving the denitrification effect of sewage treatment provided by the invention, the denitrification effect of sewage treatment of an urban sewage treatment plant can be remarkably improved, and a domestic sewage treatment process is not influenced; therefore, the invention solves the problems that in the prior art, the treatment cost of the two kinds of wastewater is high, and resource waste and environmental pollution are caused by direct discharge of the bioethanol vinasse liquid extract after treatment; and the economic benefit, the environmental benefit