CN214032207U - Deep dehydration equipment using sludge conditioner - Google Patents

Abstract

The utility model discloses an use degree of depth dewatering equipment of sludge conditioner, it includes sludge impurity removal pond, sludge treatment conveying system, conditioner stirring conveying system, the line mixer, the dehydration filter bag, water catch bowl and drainage well, the solid that removes great particle size in the mud is carried out the interception and is clear away through sludge impurity removal pond earlier, the mud in the sludge impurity removal pond is sucked and is got into the line mixer through sludge treatment conveying system again, meanwhile conditioner stirring conveying system pump conditioner pump into the line mixer in with the mud go on intensive mixing in get into the dehydration filter bag, through utilizing the infiltration effect of dehydration filter bag and combining with throwing the conditioner, can greatly reduce the energy consumption that mechanical dehydration produced, it is fast to arrange the mud, it is big to arrange the mud volume, be very suitable for handling a large amount of silt, and simple structure, and convenient operation, need not too much manual operation in the use, the labor cost is saved.

Description

Deep dehydration equipment using sludge conditioner

The technical field is as follows:

the utility model relates to a sludge treatment technical field especially relates to an use deep dehydration equipment of sludge conditioner.

Background art:

with the enhancement of national environmental protection consciousness, the situation of 'heavy water light mud' is broken through in sewage treatment, meanwhile, the waste is changed into valuable to realize sludge resource utilization, the sludge treatment needs to be reduced, stabilized, harmless and resource, and the overall requirements of 'green, circular and low carbon' are met.

The treatment and disposal of the sludge should be in a way of reduction, stabilization, harmlessness and reclamation, and the primary purpose of the sludge treatment is to realize the reduction, because the high water content of the sludge limits the subsequent disposal, the dehydration of the sludge should be the important factor in the sludge treatment. Sludge is difficult to dehydrate due to the properties of the sludge, the most common dehydration mode at present is mechanical dehydration, and a conditioner is usually added before the mechanical dehydration to improve the dehydration performance of the sludge and facilitate the dehydration. Sludge dewatering is an important link of sludge treatment and disposal, the dewatering degree directly influences the sludge resource utilization way, the lower the sludge moisture content is, the smaller the volume is, the simpler the subsequent treatment and disposal is, and the lower the cost is. However, since the sludge has a complicated structure and high hydrophilicity, the effect of directly and mechanically dewatering the sludge is poor. Therefore, in practical application, the sludge is conditioned before being dehydrated to improve the dehydration performance of the sludge, and the sludge is taken as a starting process and has the effects of reducing the sludge amount, reducing the sludge toxicity and the like, so that a deep dehydration method using a sludge conditioner and equipment thereof are urgently needed, the dehydration and solidification efficiency is improved, the sludge treatment cost is reduced, and the environmental and economic benefits are realized on the basis of realizing reduction, stabilization, harmlessness and recycling.

The utility model has the following contents:

the technical solution of the utility model is as follows:

the utility model aims at solving the existing problems and providing a deep dehydration device using a sludge conditioner.

The deep dehydration equipment using the sludge conditioner comprises a sludge impurity removal pool, a sludge treatment conveying system, a conditioner stirring conveying system, a pipeline mixer, dehydration filter bags, a water collection tank and a drainage well, wherein the sludge impurity removal pool is connected with the sludge treatment conveying system through a pipeline, the sludge treatment conveying system and the conditioner stirring conveying system are respectively connected with the pipeline mixer through pipelines, the outlet end of the pipeline mixer is connected with the dehydration filter bags through pipelines, the water collection tank is arranged on the periphery of each dehydration filter bag, and the water collection tank is connected with the drainage well through a pipeline.

As preferred, sludge treatment conveying system is including preliminary dewatering box and secondary dewatering box, preliminary dewatering box is close to its bottom department and has seted up the feed inlet, is close to its top department and has seted up the discharge gate, the feed inlet pass through the dredge pump with mud edulcoration pond is linked together, there is the secondary dewatering box preliminary dewatering box's discharge gate through the pipe connection.

As preferred, preliminary dewatering box is including the box, box below center department installs driving motor, driving motor's output passes the bottom of box is fixed with the pivot, the pivot be vertical set up in the box, fixedly connected with spiral auger in the pivot, a plurality of apopores have been seted up on the lateral wall of box, the box outside is the parcel formula and is fixed with the header tank, the box is linked together through apopore and header tank, the delivery port has been seted up to the bottom of header tank.

As preferred, the secondary dewatering box is including the filter of notch cuttype structure, the filter will the secondary dewatering box separates for mud chamber and quality of water chamber, the filter is including a plurality of ladder filter layers, the secondary dewatering box internal fixation has a plurality of squeeze rolls just squeeze roll and ladder filter layer laminate mutually, set up a plurality of through-holes that do benefit to the outflow of water on the ladder filter layer, lie in on the secondary dewatering box the mud mouth has been seted up to the minimum department of filter.

Preferably, the box body is in a circular truncated cone shape, and the diameter of the box body is gradually reduced from bottom to top.

Preferably, fine flexible bulges are densely distributed on the squeezing roller, and a plurality of high-pressure spray heads are fixed above the inner wall of the secondary dewatering box.

Preferably, be provided with big auger conveyor and be located big auger conveyor's the little auger conveyor of the upper and lower side in the line mixer, big auger conveyor's the direction of rotation of transport is opposite with little auger conveyor's the direction of rotation of transport, just big auger conveyor's slew velocity is greater than two little auger conveyor sum.

The beneficial effects of the utility model reside in that:

1. the utility model discloses an use degree of depth dewatering equipment of sludge conditioner, it includes sludge impurity removal pond, sludge treatment conveying system, conditioner stirring conveying system, the line mixer, the dehydration filter bag, water catch bowl and drainage well, the solid that removes great particle size in the mud is carried out the interception and is clear away through sludge impurity removal pond earlier, the mud in sludge impurity removal pond is sucked and is got into the line mixer through sludge treatment conveying system again, meanwhile conditioner stirring conveying system pump conditioner pump go into the line mixer in with the mud go into the dehydration filter bag after fully mixing, through utilizing the infiltration effect of dehydration filter bag and combining the throwing conditioner, can greatly reduce the energy consumption that mechanical dehydration produced, it is fast to arrange mud, the row mud volume is big, be particularly useful for handling a large amount of silt, and simple structure, and convenient for operation, need not to carry out too much manual operation in the use, the labor cost is saved.

2. The utility model discloses an use degree of depth dewatering equipment of sludge conditioner, it is including the line mixer, be provided with big auger conveyor and little auger conveyor in the line mixer, big auger conveyor's the transport direction of rotation and little auger conveyor's transport direction of rotation are opposite, just big auger conveyor's slew velocity is greater than two little auger conveyor sum, its benefit lies in: the first mixing time who has increased amendment and mud and the contact volume of mixing, the second reverse action makes mud and amendment change at local direction of motion, the flow state of mud is changed into the turbulent flow by the laminar flow, impel both to mix more evenly, the third can produce some caking or pile up at the part and produce the dead angle in mud and amendment transportation process, influence conveying efficiency, the little auger conveyor of reverse action will cake or accumulational mud at this moment stirs and smashes, thereby can be smooth carry out follow-up transport, the pipeline has been avoided blockking up.

3. The utility model discloses an use degree of depth dewatering equipment of sludge conditioner, it is including the secondary dewatering box, the secondary dewatering box is including the filter, its notch cuttype structure of filter extends to the mud outlet from top to bottom, has increased the area of contact of mud with the filter to its filter area has been increased, does benefit to the outflow of quality of water, and its in-process from another ladder of a ladder cunning has increased the flow velocity of mud, thereby avoids the condition of mud jam.

Drawings

FIG. 1 is a schematic structural view of a deep dehydration apparatus using a sludge conditioner according to the present invention;

FIG. 2 is a schematic structural view of the sludge treatment conveying system of the present invention;

fig. 3 is a schematic structural diagram of the line mixer of the present invention.

In the figure: the device comprises a sludge treatment and conveying system 1, a feeding pipe 11, a sludge suction pump 12, a conditioner stirring and conveying system 2, a conditioner storage device 21, a conditioner stirring device 22, a conditioner pumping device 23, a pipeline mixer 3, a large auger conveying device 31, a small auger conveying device 32, a dehydration filter bag 4, a water collecting tank 5, a drainage well 6, a sludge impurity removing tank 7, a primary dehydration tank 8, a driving motor 81, a rotating shaft 82, a spiral auger 83, a discharge port 88, a tank body 84, a water outlet 85, a water collecting tank 86, a water outlet 861, a secondary dehydration tank 9, a filter plate 91, a sludge chamber 92, a water quality chamber 93, an extrusion roller 94, a sludge outlet 95, a stepped filter layer 911 and a through hole 912.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

As shown in fig. 1-3, a deep dehydration method using sludge conditioner comprises the following steps:

s1: collecting sludge, namely collecting the sludge to be treated;

s2: dewatering and solidifying, namely pumping the sludge collected in the step S1 into deep dewatering equipment with a sludge conditioner, and carrying out dewatering and solidifying treatment to obtain dewatered and solidified sludge;

s3: and (4) mechanical dehydration, namely performing mechanical dehydration treatment on the dehydrated and solidified sludge in the step S2 to obtain a mud cake, wherein the mud cake has low water content and reaches the relevant national standard, and the mud cake can be subjected to landfill treatment without generating landfill leachate.

The conditioner in the step S2 comprises the following components in percentage by weight:

10 to 30 percent of calcium oxide;

10-28% of silicon dioxide;

0.1-1.5% of ferric oxide;

1-5% of potassium oxide;

1-8% of phosphorus pentoxide;

0.1-1% of aluminum oxide;

0.1-1.5% of ferric trichloride;

1 to 5 percent of surfactant;

50-60% of magnesium oxide modified zeolite molecular sieve.

Ferric trichloride is used as a flocculating agent, iron ions of the ferric trichloride are hydrolyzed to form colloidal hydroxyl polymer or hydroxide precipitate, the stability of large-particle sludge is changed through the actions of electrostatic adhesion, net capture and the like, and floc particles with certain bearing capacity are formed by rolling and sweeping small-particle sludge. Calcium oxide is used as a coagulant aid, the pH value is adjusted, the structure of sludge particles can be changed, calcium ions are adsorbed by humic acid in sludge after the calcium oxide is dissolved, a porous grid-shaped framework is formed in the sludge, the compressibility of the sludge can be improved, and the strength of flocs is enhanced. The added ferric trichloride and calcium oxide also have the functions of passivating heavy metals, sterilizing and deodorizing, so that the heavy metals in an ionic state can generate hydroxide precipitates in an alkaline environment, and the heavy metal content in the dehydrated mud cakes can be obviously reduced by regularly removing the precipitates at the bottom. The pH value of the sludge is increased, the hydrolysis heat release is carried out, cell walls based on protein, enzyme, acidic RNA and carbohydrate cell tissues and grease are damaged, so that the sterilization effect is achieved, a proper amount of surfactant is added, one part of surfactant can be adsorbed on polymer molecules, the full extension of the polymer molecules is promoted, and a better adsorption and bridging effect is achieved; some adsorbs on the mud surface with the mode of difference, influences the interact between polymer and the mud granule, the utility model discloses a conditioner can make the inside bound water of mud floc released, can change the surface charge of mud moreover, promotes extracellular polymer hydrolysis, has reduced the affinity to water, reduces the viscidity of mud to mud dehydration performance obtains obviously improving, and it is high to have realized the dehydration rate of mud, reduces the heavy metal risk, handles to deal with and the resource utilization provides the condition for its follow-up processing, realizes "minimizing, stabilizing, innoxious, the resourceization" of sludge treatment.

Specifically, the magnesium oxide modified zeolite molecular sieve is prepared by mixing magnesium oxide and zeolite molecular sieve according to the weight ratio of 1

1.5-2, performing ball milling treatment to obtain a mixture, placing the mixture in a muffle furnace, performing constant-temperature roasting treatment, and cooling to room temperature to obtain the magnesium oxide modified zeolite molecular sieve, wherein the zeolite molecular sieve is an inorganic crystal material, has a regular pore channel structure, strong acidity, high hydrothermal stability and strong adsorption performance, and is directly dispersed on the zeolite molecular sieve by a roasting method to increase the specific surface area of the zeolite molecular sieve so as to obtain strong alkaline active sites and retain a microporous structure, thereby improving the adsorption capacity.

Specifically, the surfactant is composed of sodium dodecyl benzoate and hexadecyl trimethyl ammonium chloride, and the weight ratio of the sodium dodecyl benzoate to the hexadecyl trimethyl ammonium chloride is 1: 2-3, mixing sodium dodecyl benzoate and hexadecyl trimethyl ammonium chloride in a ratio of 1: 1.5-3, the synergistic effect of the surfactant and other inorganic components can be enhanced, and the dehydration effect is better than that of other surfactants.

A deep dehydration device using a sludge conditioner comprises a sludge impurity removal tank 7, a sludge treatment conveying system 1, a conditioner stirring conveying system 2, a pipeline mixer 3, a dehydration filter bag 4, a water collecting tank 5 and a drainage well 6;

the sludge impurity removal tank 7 is connected with a sludge treatment conveying system 1 through a pipeline;

the outlet end of the sludge treatment conveying system 1 and the outlet end of the conditioner stirring conveying system 2 are respectively communicated with the pipeline mixer 3;

the outlet end of the pipeline mixer 3 is connected with a plurality of dehydration filter bags 4 through pipelines, hard pipes are arranged between the pipelines and the dehydration filter bags 4, one ends of the hard pipes are inserted into the dehydration filter bags 4, and the hard pipes and the dehydration filter bags 4 are fixed through iron wires;

and a water collecting tank 5 is arranged on the periphery of the dehydration filter bag 4 and is connected with the drainage well 6 through a pipeline.

Specifically, sludge treatment conveying system 1 is including preliminary dewatering box 8 and secondary dewatering box 9, preliminary dewatering box 8 is close to its bottom department and has seted up the feed inlet, is close to its top department and has seted up discharge gate 88, feed inlet department is fixed with inlet pipe 11, be fixed with suction dredge 12 on the inlet pipe 11. Preliminary dewatering box 8 is including box 84, box 84 below center department installs driving motor 81, driving motor 81's output passes box 84's bottom is fixed with pivot 82, pivot 82 is vertical set up in the box 84, fixedly connected with spiral auger 83 on the pivot 82 for carry mud and carry out mud-water separation when defeated material, during the operation, spiral auger 83 drives mud and rises, and water in the mud receives the influence of gravity to flow downwards, box 84 is the round platform form, and its diameter reduces from bottom to top gradually, thereby box 84's space reduces from bottom to top gradually, and spiral auger 83's transport is carried mud to because the space reduces gradually, extrudees mud gradually, carries out the preliminary cement separation of machinery. The utility model discloses a mud-water separator, including box 84, apopore 85, the box 84 outside is the parcel formula and is fixed with header tank 86, the lateral wall of box 84 is linked together through apopore 85 and header tank 86 for the water that separates out in the mud discharges through apopore 85, reaches preliminary mud-water separation's effect, delivery port 861 has been seted up to the bottom of header tank 86 for the emission of water.

Specifically, the discharge port 88 of the primary dewatering box 8 is connected with the secondary dewatering box 9 through a pipeline, the secondary dewatering box 9 comprises a filter plate 91 with a step-shaped structure, the filter plate 91 divides the secondary dewatering box 9 into a sludge chamber 92 and a water quality chamber 93, the filter plate 91 comprises a plurality of step filter layers 911, a plurality of squeeze rollers 94 are fixed in the secondary dewatering box 9, the squeeze rollers 94 are attached to the step filter layers 911, a plurality of through holes 912 which are beneficial to water outflow are arranged on the step filter layer 911, a sludge outlet 95 is arranged at the lowest point of the filter plate 91 on the secondary dewatering box 9, after entering the secondary dewatering box 9, the sludge flows down along the ladder structure of the filter plate 91 and is extruded by the extrusion roller 94 to press out the water in the sludge, and water flows into the water quality cavity 93 along the through hole 912, and sludge flows out of the preliminary dewatering box 8 along the ladder structure. Its notch cuttype structure of filter 91 extends to mud outlet 95 from top to bottom, has increased the area of contact of mud with filter 91 to increased its filter area, do benefit to the outflow of quality of water.

Specifically, the squeeze roll 94 is densely provided with small flexible protrusions for brushing the sludge blocked in the through holes 912, a plurality of high-pressure spray heads are fixed above the inner wall of the secondary dewatering box 9, and after the device is used for a period of time, the high-pressure spray heads are opened, and the squeeze roll 94 is opened in a rotating mode, so that the residual sludge in the secondary dewatering box 9 can be cleaned.

Specifically, a plurality of high-pressure nozzles are fixed on the inner wall of the water collection tank 86, and are used for cleaning sludge remaining in the water outlet hole 85.

Specifically, the conditioner stirring and conveying system 2 comprises a conditioner storage device 21, a conditioner stirring device 22 and a conditioner pumping device 23, wherein the conditioner pumping device 23 pumps the conditioner in the conditioner stirring device 22 into the pipeline mixer 3.

Specifically, be provided with big auger conveyor 31 and be located big auger conveyor 31 upper and lower little auger conveyor 32 in the pipe mixer 3, big auger conveyor 31's the transport direction of rotation is opposite with little auger conveyor 32's transport direction of rotation, just big auger conveyor 31's slew velocity is greater than two little auger conveyor 32 sum, mud and conditioner are 4 direction motions to the dehydration filter bag under big auger conveyor 31's the transport, little auger conveyor 32 reverse transport is rotatory, and its benefit lies in: the first mixing time who has increased amendment and mud and the contact volume of mixing, the second reverse action makes mud and amendment change at local direction of motion, the flow state of mud is changed into the turbulent flow by the laminar flow, impel both to mix more evenly, the third can produce some caking or pile up at the part and produce the dead angle in mud and amendment transportation process, influence conveying efficiency, little auger conveyor 32 of reverse action will cake or accumulational mud stir and smash this moment, thereby can be smooth carry out follow-up transport, the pipeline has been avoided blockking up.

A drainage device is arranged on the dewatering filter bag 4 in the circumferential direction and/or the longitudinal direction, the drainage device comprises a drainage framework and a geotextile layer, and a height control device is also arranged above the dewatering filter bag 4; the energy consumption generated by mechanical dehydration can be greatly reduced by utilizing the percolation effect of the dehydration filter bag and adding the corresponding conditioner in combination, the sludge discharge speed is high, the sludge discharge amount is large, the sludge treatment device is very suitable for treating a large amount of sludge, the structure is simple, the operation is convenient, excessive manual operation is not needed in the use process, and the labor cost is saved; in the construction process, water in the dehydration filter bag can be collected into the drainage device, so that the overall drainage capacity and drainage efficiency of the filter bag are improved; and a height control device is also arranged above the dehydration filter bag, so that the filling height of the filter bag can be controlled, and the construction safety is improved.

A grid structure is arranged in the sludge impurity removal tank 7, so that solid matters with larger particle sizes can be intercepted and removed.

The utility model discloses an use degree of depth dewatering equipment of sludge conditioner is earlier through the solid that removes great particle diameter in the sludge edulcoration pond 7 with mud and is intercepted and clear away, rethread sludge treatment conveying system 1 gets into pipe-line mixer 3 with the mud suction in the sludge edulcoration pond 7, meanwhile, conditioner stirring conveying system 2 goes into pipe-line mixer 3 with the conditioner pump in and gets into dehydration filter bag 4 after carrying out the intensive mixing with mud in, throw the conditioner through the infiltration effect that utilizes dehydration filter bag 4 and combine, can greatly reduce the produced energy consumption of mechanical dehydration, it is fast to arrange the mud, it is big to arrange the mud volume, be applicable to very much and handle a large amount of silt, moreover, the steam generator is simple in structure, and convenient for operation, need not to carry out too much manual operation in the use, and the human cost is saved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (7)

1. The utility model provides an use degree of depth dewatering equipment of sludge conditioning agent, its includes sludge impurity removal pond (7), sludge treatment conveying system (1), conditioning agent stirring conveying system (2), pipe-line mixer (3), dehydration filter bag (4), water catch bowl (5) and drainage well (6), its characterized in that: the sludge impurity removal pond (7) is connected with a sludge treatment conveying system (1) through a pipeline, the sludge treatment conveying system (1) and the conditioner stirring conveying system (2) are respectively connected with the pipeline mixer (3) through pipelines, the outlet end of the pipeline mixer (3) is connected with the plurality of dehydration filter bags (4) through pipelines, a water collection tank (5) is arranged on the periphery of each dehydration filter bag (4), and the water collection tank (5) is connected with the drainage well (6) through a pipeline.

2. The deep dewatering equipment using sludge conditioner as claimed in claim 1, wherein: sludge treatment conveying system (1) is including preliminary dehydration case (8) and secondary dehydration case (9), preliminary dehydration case (8) are close to its bottom department and have seted up the feed inlet, are close to its top department and have seted up discharge gate (88), the feed inlet through dredge pump (12) with mud edulcoration pond (7) are linked together, discharge gate (88) of preliminary dehydration case (8) have secondary dehydration case (9) through the pipe connection.

3. The deep dewatering equipment using sludge conditioner as claimed in claim 2, wherein: preliminary dewatering box (8) are including box (84), box (84) below center department installs driving motor (81), the output of driving motor (81) passes the bottom of box (84) is fixed with pivot (82), pivot (82) be vertical set up in box (84), fixedly connected with spiral auger (83) are gone up in pivot (82), a plurality of apopores (85) have been seted up on the lateral wall of box (84), the box (84) outside is the parcel formula and is fixed with header tank (86), box (84) are linked together through apopore (85) and header tank (86), delivery port (861) have been seted up to the bottom of header tank (86).

4. The deep dewatering equipment using sludge conditioner as claimed in claim 2, wherein: secondary dehydration case (9) is including filter (91) of notch cuttype structure, filter (91) will secondary dehydration case (9) are separated for mud chamber (92) and quality of water chamber (93), filter (91) are including a plurality of ladder filter layer (911), secondary dehydration case (9) internal fixation has a plurality of squeeze rolls (94) just squeeze roll (94) and ladder filter layer (911) laminate mutually, set up a plurality of through-holes (912) that do benefit to the outflow of water quality on ladder filter layer (911), lie in on secondary dehydration case (9) the mud mouth (95) have been seted up to the minimum punishment department of filter (91).

5. The deep dewatering equipment using sludge conditioner as claimed in claim 1, wherein: be provided with big auger conveyor (31) and be located little auger conveyor (32) of big auger conveyor (31) upper and lower side in pipeline mixer (3), the transport direction of rotation of big auger conveyor (31) is opposite with the transport direction of rotation of little auger conveyor (32), just the slew velocity of big auger conveyor (31) is greater than two little auger conveyor (32) sum.

6. The deep dewatering equipment using sludge conditioner as claimed in claim 3, wherein: the box body (84) is in a circular truncated cone shape, and the diameter of the box body is gradually reduced from bottom to top.

7. The deep dewatering equipment using sludge conditioner as claimed in claim 4, wherein: fine flexible bulges are densely distributed on the squeezing roller (94), and a plurality of high-pressure spray heads are fixed above the inner wall of the secondary dewatering box (9).

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