Combined conditioning method for sludge high-efficient dehydration

The invention relates to a combined conditioning method for sludge high-efficient dehydration, and belongs to the field of sludge dehydration pretreatment. The method comprises the following steps: acidifying sludge to be dehydrated by concentrated sulfuric acid, adjusting the pH value of the sludge system to a range of 3.5-5, continuously stirring the sludge system by a stirring pad for 15 to 30 minutes; adding a strong oxidant (potassium ferrate) accounting for 0.2 to 4% of the total dried sludge weight into the acidified sludge, wherein the potassium ferrate is dissolved by water before addition; rapidly stirring the sludge for 2 minutes at a stirring speed of 200 to 300 r/min, then slowly stirring the sludge for 20 to 40 minutes at a stirring speed of 80 to 150 r/min; then adding polymeric ferric sulfate accounting for 6 to 12% of the total dried sludge weight into the sludge conditioning system, wherein the polymeric ferric sulfate is dissolved by water to prepare a solution with a mass concentration of 20-50% before addition; keeping on stirring at a slow stirring speed for 15 to 30 minutes; then adding quicklime accounting for 3 to 8% of the total dried sludge weight into the sludge conditioning system, adjusting the pH value to a range of 6-8, evenly dispersing the quicklime, and immediately dehydrating the sludge.