Movable-electrode electro-osmosis dewatering device for dewatering urban sewage sludge

Abstract

The invention discloses a movable-electrode electro-osmosis dewatering device for dewatering urban sewage sludge. The device consists of a polyvinyl chloride (PVC) sample loading barrel, a screw rod, a movable electrode group, an adjustable voltage direct current power supply and the like, wherein an alloy fixing electrode plate is arranged at the bottom of the sample loading barrel; the movable electrode group consisting of a stainless steel conducting rod, a pointed alloy electrode, an organic glass upper plate and a nut is rotatably connected with the screw rod in the center of the sample loading barrel; and after the sludge is charged into the sample loading barrel and the power is switched on, the screw rod is rotated at a fixed rotating speed to lower the movable electrode group at a constant speed, voltage is adjusted synchronously and voltage gradient between electrodes is kept so as to perform electro-osmosis dewatering. The problems of the reduction in the water content of adewatered sample, the rise of resistance, the increase of consumed voltage and the reduction in electro-osmosis efficiency in a fixed electrode electro-osmosis treatment method can be solved. The water content of discharged sludge of which the water content is 80 percent and voltage and electrode moving rate are selected according to an electro-osmosis characteristic can be lowered to be between 60 and 70 percent after treatment and the energy consumption on the treatment of each square meter of wet sludge is about 120 kilowatt hours.

Description

technical field [0001] The invention relates to a moving electrode type electroosmosis dewatering device, in particular to a moving electrode type electroosmosis dewatering device used for dewatering urban sewage sludge. Background technique [0002] The output of urban sewage sludge in my country has reached 19 million tons per year (calculated on the basis of 20% solid content). The moisture content of primary sludge is as high as 95%. Dehydration treatment can significantly reduce the volume of sludge, thereby reducing the cost of subsequent treatment and disposal. It is a key link in sludge treatment and disposal. Due to the low hydraulic permeability coefficient of sludge, the dehydration effect of the commonly used mechanical dehydration method can only reach about 80% moisture content, and there is still a large dehydration space. Electroosmosis dehydration is a treatment technology for sludge dehydration by using electroosmosis phenomenon. Electroosmosis is the perc...

AI Technical Summary

Problems solved by technology

At present, the electroosmotic dehydration of sludge at home and abroad adopts the electroosmotic treatment method of fixed electrodes. During the treatment process, the moisture content of the dehydrated sludge decreases and the resistance increases, resulting in an increase in the consumption voltage, resulting in a gradual decline in electroosmotic efficiency and high energy consumption.

The above deficiencies make it difficult to apply and promote sludge electroosmosis dewatering technology

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