A method of integration of concentration-dehydration and aerobic air-drying of sewage sludge comprises the following steps: (a) conditioning by an organic agent (3) (b) gravitationally concentrating (5) the residual sludge conditioned by the organic agent (c) conditioning by inorganic agents (7) (d) mechanically dehydrating (8) (e) crushing and dispersing (10) and (f) aerobically air-drying (11). The method has the following advantages: (i) to improve the sedimentation performance of the residual sludge, thus improving the concentration efficiency of sludge, reducing the concentrating time and reducing the volume of the concentrating pool (ii) to reduce the volume of the dehydrated sludge correspondingly, thus reducing the succedent heat treatment load (iii) to have low energy consumption for drying (iv) the sludge granules moving at low speed during the drying process, thus being produced stably and securely without powder (v) the dried exhaust air can reach environmental-friendly standard discharge after being washed by water (vi) the output sludge granules are not compact, which is good for utilizing as the succedent resources.
