Why do wastewater sludge drying? The wastewater treatment process is accompanied by the generation of sludge, the large amount of sludge and high water content, complicated processing, high difficulty and high cost. The wastewater produced by most industrial production processes is complex and difficult to be directly biochemically treated. It needs to be discharged after physicochemical, biochemical and advanced treatment. For example, in the production process of toluene diisocyanate, the physicochemical sludge produced in the wastewater treatment process. And the biochemical sludge, after centrifugation, the water content is as high as 80±5wt%, and the annual output is 6000-8000 tons. It needs to be transported by the designated processing unit for transportation. The transportation process is heavy and the transportation cost is high; the existing treatment Technology, large workload, high cost, mechanical filtration has limited capacity for sludge reduction, and treated emi...