Sludge dehydrator

Abstract

The invention discloses a sludge dehydrator, which comprises a frame and a supporting plate connected with the frame; a sludge pumping mechanism and a pressure extrusion mechanism are arranged at two sides of the supporting plate respectively; a frame plate type filter pressing mechanism is arranged between the pressure extrusion mechanism and the connected supporting plate; the filter pressing mechanism comprises a filter pressing unit; a filter plate is arranged in the filter pressing unit; an annular sleeve is sleeved on the peripheral wall of the filter plate; a filter pressing cavity is formed between the filter plate and a front pressing plate; filter cloth is arranged on the surface of the filter plate in the filter pressing cavity; the surface of the filter plate is provided with a filtrate drainage hole; the drainage hole is connected with a drainage passage arranged in the filter plate and extended to the exterior; and the filter plate is interconnected with the surface of arear pressing plate to form a whole, and the middle part of the filter plate is provided with a through hole which is communicated with a pipeline of the sludge pumping mechanism. The sludge dehydrator can improve the filter pressing efficiency and is convenient to control the dryness of mud cakes.

Description

technical field [0001] The invention relates to a plate and frame filter press dehydrator of sludge dewatering equipment in a sewage treatment plant. Background technique [0002] At present, domestic sludge dewatering technology and equipment are mainly belt filter presses and centrifugal dehydrators, and there are also a small number of traditional plate and frame filter presses, which can only dehydrate concentrated sludge with a moisture content of more than 93% to a moisture content of 75-85%, the existing problems of sludge with a moisture content of 75-85% are: inconvenient transportation and high cost, large stacking area, and cannot be directly disposed of at all, sludge contains a large amount of organic matter and rich nitrogen, phosphorus, potassium, etc. Nutrients, which are perishable, produce stench and breed mosquitoes and flies, and the resulting stench causes secondary pollution; they cannot be directly disposed of, and must be reprocessed before they can b...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic sludge dewatering technology and equipment are mainly belt filter presses and centrifugal dehydrators, and there are also a small number of traditional plate and frame filter presses, which can only dehydrate concentrated sludge with a moisture content of more than 93% to a moisture content of 75-85%, the existing problems of sludge with a moisture content of 75-85% are: inconvenient transportation and high cost, large stacking area, and cannot be directly disposed of at all, sludge contains a large amount of organic matter and rich nitrogen, phosphorus, potassium, etc. Nutrients, which are perishable, produce stench and breed mosquitoes and flies, and the resulting stench causes secondary pollution; they cannot be directly disposed of, and must be reprocessed before they can be landfilled or utilized, while thermal energy treatment is costly and easy to produce odor emissions, etc. Secondary pollution

[0003] At present, the ordinary plate and frame filter press, diaphragm plate and frame filter press and sludge deep dewatering filter press will filter out a large amount of sludge in the process of forming a mud cake with a low moisture content after the sludge is dehydrated by the filter press. In the current sludge filter press dehydrator, the sludge filtrate is only discharged through one or a few small holes in the lower part of the whole filter plate, and the so-called filter plate surface is a flat plate surface, so The filtrate in the whole sludge will need to overcome the longer route and greater resistance of the sludge to be discharged, which is not conducive to the discharge of the filtrate in the sludge, affecting the time of the filter and the dryness of the mud cake; in addition, due to the filter plate The structures are different, and its defects are mainly reflected in the difficulty in maintaining the pressure of the filter chamber, that is, the poor sealing reliability of the filter chamber; moreover, the working pressure in the process of filtration cannot be known, and the operation of the delivery pump is realized solely by the experience of the operator. Start and stop, valve opening and closing, which is not conducive to energy saving and consumption reduction, and at the same time cannot ensure the moisture content of the mud cake

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