Dewatering method and device for excess sludge

Abstract

The invention relates to a dewatering method and device for excess sludge and provides the dewatering method for the excess sludge. The method comprises the following steps: (A), vortex concentrationof surplus sludge; (B), filtration of the excess sludge by a fluidized bed; (C), vortex autorotation dewatering; (D), airflow acceleration sorting; (E), sludge vortex autorotation re-dewatering and particle capture. The invention also provides the dewatering device for the excess sludge.

Description

technical field [0001] The disclosure belongs to the fields of chemical industry and environmental protection, and relates to a method and a device for realizing the removal of water in excess sludge and the sorting and reuse of filter media. Specifically, the present disclosure relates to a method and device for deep dewatering of excess sludge. Background technique [0002] In recent years, the discharge of industrial wastewater and domestic sewage in my country has increased year by year. While the sewage treatment capacity has been improved, the amount of sludge has also increased significantly. The treatment capacity reaches 190 million cubic meters per day. The activated sludge method is the main measure to solve water pollution, but at the same time, the cells and excreta of activated sludge continue to proliferate to produce a large amount of sludge. In 2018, my country produced sewage with a water content of 80% by weight. There are more than 50 million tons of sludg...

AI Technical Summary

Problems solved by technology

[0013] A technical problem to be solved by the present invention is: the traditional sludge filtration methods are mainly surface filtration and depth filtration, it is necessary to add coagulant to change the dehydration ability of the sludge, and the filter medium after dehydration needs to be cleaned. The cleaning liquid needs to be settled, the process is relatively complicated, and it will cause the dehydrated sludge to contain chemical components, which may cause secondary pollution and hinder the resource utilization of the dried sludge; After the mud is concentrated, deep filtration is carried out without adding any chemical agent, and the filtration and dehydration of the sludge is realized entirely by physical action. In the present invention, the principle of airflow acceleration sorting is used to backfill the filter medium into the fluidized bed concentration filter, which is environmentally friendly. The advantages of high dehydration efficiency and high utilization rate of filter media

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