Method and device for solidifying sludge by virtue of vacuum electric osmosis combined dynamic load

Abstract

The invention discloses a method and device for solidifying sludge by virtue of a vacuum electric osmosis combined dynamic load. The method comprises the steps of placing sludge to be solidified into a sludge tank of a solidifying device, arranging a cathode tube passing through the bottom of the tank in the center of the sludge tank, sealing the top end of the cathode tube, forming a group of uniformly-distributed water seepage holes in the middle section of the cathode tube, coating a layer of geotechnical cloth outside the cathode tube, connecting the bottom end of the cathode tube and an air inlet of a vacuum pump through a hose, and connecting an air outlet of the vacuum pump and a water storage tank through a hose; inserting a group of uniformly-distributed anode bars at the periphery of the sludge tank; arranging a vibrator at the top of the sludge to be solidified; and when the sludge to be solidified is needed to be solidified, turning on a switch of a direct-current power source, starting the vibrator, meanwhile, starting the vacuum pump to generate negative pressure in the cathode tube, and pumping water permeating into the cathode tube into the water storage tank. By using the method and device, heavy metals in sludge can be driven to be migrated into the cathode tube along with water under the action of an electric field so as to be discharged; and the vacuum pump operates at different intervals, so that the energy consumption can be reduced.

Description

technical field [0001] The invention relates to a method and a device for solidifying sludge with vacuum electroosmosis combined with dynamic load, belonging to the technical field of sludge treatment. Background technique [0002] At present, the total amount of residual sludge produced by sewage treatment plants in my country is close to 17 million tons every year. Since the water content of these remaining sludges is generally over 90% and contains heavy metals, they do not meet the national agricultural sludge standards. Therefore, these excess sludge cannot be directly discharged to farmland for use as agricultural soil. Therefore, it is necessary to further dehydrate the remaining sludge until the water content is lower than 60%, and the heavy metal content can be reduced before it can be directly used as agricultural soil. [0003] After dehydration by existing conventional dehydration machinery, the moisture content of sludge is generally around 80%, and existing c...

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Problems solved by technology

[0004] The object of the present invention is to provide a method and device for solidifying sludge with vacuum electroosmosis combined with dynamic load, so as to solve the problem of low efficiency of existing dehydration machinery and low dehydration rate. Low and unable to reduce the technical problem of heavy metal content in sludge, so as to overcome the deficiencies of the existing technology

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