Treatment method for improving denitrification performance of activated sludge process at low temperature

The invention discloses a treatment method for improving denitrification performance of an activated sludge process at low temperature, and belongs to the technical field of sewage treatment. The treatment method comprises the step of adding N-butyryl-homoserine lactone into a to-be-treated system when the water temperature in the to-be-treated system is less than or equal to 12 DEG C. According to the treatment method, when a to-be-treated system is in a low-temperature condition, the quorum sensing phenomenon among microorganisms in the to-be-treated system is intervened by adding C4-HSL signal molecules, so that the denitrification performance of the activated sludge process at the low temperature can be effectively improved; under the condition of effectively improving the denitrification effect, the sludge concentration can be reduced, and the residual sludge amount is reduced, so that the sludge treatment cost is reduced; the mode can be quickly started and takes effect, and the emergency treatment requ