For the problem of low temperature in cold regions and low working temperature in aeration tanks in sewage works, the heat preservation technology in greenhouses of wastewater works is studied by means of simulation to analyze the temperature distribution and air flowing features in greenhouses. Results show that under the condition of -22℃ outdoors in winter, through the insulation of the canopy towards the aeration tank, the average air temperature remains at 4℃ or so, while the water temperature of the outlet of the aeration tank remains at about 11.2℃; The optimal material of insulation membrane of the outside aeration tank is PO, while the most undesirable material is PVC, And PE and EVA are mediate; and the aeration tank of the best heat preservation is the one that uses greenhouse of 2.5 meter height. The effect of double insulation membranes is better than that of a single membrane.

severe cold area  /  heat insulation of greenhouse  /  aeration tank  /  working temperature