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 (t) 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 subsequent 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 reclamation.