Energy-saving electro-osmotic sludge dewatering method with high dryness

Abstract

The invention relates to an energy-saving electroosmotic high-dryness dewatering method for sludge, which includes the following steps: a plurality of electroosmotic filter pressing units are arranged, the interior of each electroosmotic filter pressing unit is provided with a filter pressing chamber, electroosmotic and filter-pressing dewatering is then carried out after feed is dewatered in thefilter pressing chambers, and as the moisture content of the sludge on the anode plate sides of the electroosmotic filter pressing units decreases, sludge-cutting mechanisms start to conduct sludge-cutting action; the sludge-cutting mechanisms which are in one-to-one correspondence to the electroosmotic filter pressing units are arranged, moreover, sludge-cutting gaps are arranged in the anode plate sides of the corresponding electroosmotic filter pressing units, and at regular intervals, the sludge-cutting mechanisms cut the sludge layers on the anode plate sides of the electroosmotic filterpressing units via the sludge-cutting gaps; and the plurality of electroosmotic treatment units and the sludge-cutting mechanisms are all mounted on a housing. By electrifying sludge to be treated, the sludge with negative charges is attracted to the anodes, furthermore, the dry sludge layers on the anodes are cut off in time, and thereby the influence of resistance increase and current decrease of anode sludge on electroosmotic dewatering is reduced.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to an energy-saving electroosmotic sludge dehydration method with high dryness. Background technique [0002] The high water content of sludge is the bottleneck restricting the treatment and disposal of sludge. The sludge with high water content is not only bulky, but also contains a large amount of organic matter, heavy metals and harmful microorganisms, which are easily corrupted or released into the environment, causing secondary pollution. It will have adverse effects on the subsequent landfill, incineration and resource utilization of sludge. Therefore, sludge dehydration reduction is the primary purpose of sludge treatment, and reduction is the basis for realizing other "three modernizations" of sludge. The drier the sludge, the more beneficial the subsequent treatment and disposal. [0003] There are four forms of water in sludge, namely free water, adsorbed water, ...

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Problems solved by technology

[0009] In view of this, the present invention aims at the technical problems existing in the prior art that the resistance of the anode sludge layer increases and the current decreases, it is difficult to maintain a constant voltage gradient during the electroosmosis process, the energy consumption is high, and the dehydration effect is poor, and a kind of anode sludge is provided. The mud layer can be removed, and the voltage at both ends of the plate can be adjusted in real time according to the thickness of the mud cake. An energy-saving electro-osmotic sludge dehydration method with high dryness to improve dehydration efficiency and effect, and reduce dehydration energy consumption.

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