<p>A sludge concentration and dehydration method is provided, which comprises the following steps: (1) add an organic agent (polyacrylamide) to the sludge for initial conditioning, then concentrate the sludge; (2) add an inorganic agent (a compound containing Fe and Ca) to the sludge for further conditioning, then transport the sludge to a dehydrator for dehydration; (3) dispose the dehydrated sludge correspondingly when it satisfies the requirements for final disposal.</p>
