Granular sludge culture system applied to denitrification of high nitrate nitrogen wastewater

The granular sludge culture system comprises a water inlet system, a carbon source feeding system, a reaction system, a three-phase separation system, a water outlet system, a heat preservation system, an internal circulation system, an aeration system and a sludge discharge system, a water inlet of the water inlet system is communicated with the reaction system and is used for introducing wastewater into the reaction system; the carbon source adding system is used for adding a carbon source into the reaction system; the three-phase separation system is used for separating liquid, gas and solid in the reaction system; the water outlet system is used for discharging liquid in the reaction system; the heat preservation system is used for preserving heat of the reaction system; the internal circulation system is used for circulating liquid in the reaction system; the aeration system is used for aerating the reaction system; the sludge discharging system is used for discharging sludge in the reaction system; the