CN115385539B - Sludge step-by-step separation system - Google Patents

Abstract

The invention provides a sludge progressive separation system, which comprises a sludge thickener, an integrated dosing device, a mixing pipeline, a sludge modulation treatment device and a low-temperature dryer, wherein the mixing pipeline is connected with the sludge thickener; the sludge preparation treatment device comprises a preparation tank and a belt filter press, wherein the preparation tank comprises a tank body and a water filtering component arranged in the tank body, the water filtering component is used for filtering out free water and interstitial water in sewage and overflowing the residual sludge out of the preparation tank into the belt filter press; the belt filter press is internally provided with a wedge-shaped dewatering area and an S-shaped squeezing dewatering area, the first conveying belt, the second conveying belt and the third conveying belt are all composed of filter cloth, and the tail ends of the first conveying belt, the second conveying belt and the third conveying belt are provided with discharging mechanisms. The sludge progressive separation system provided by the invention adopts the sludge thickener, the integrated dosing device, the mixing pipeline, the sludge modulation treatment device and the low-temperature dryer to carry out progressive dehydration treatment on sewage, has compact structure, stable production and strong dehydration and treatment capacity, and greatly improves economic benefits.

Description

Sludge step-by-step separation system

Technical Field

The invention relates to the technical field of sludge treatment, in particular to a sludge progressive separation system.

Background

With the rapid development of industry and urban construction, industrial wastewater and domestic sewage are increasing. In order to prevent pollution and protect the environment, sewage must be treated. In sewage treatment, sludge with high water content is produced, the water content is 97% -99.6%, the sludge is in a loose structure of granular or flocculent substances in a flowing state, the sludge is large in size and difficult to dispose and consume, and dehydration is needed in sludge disposal, otherwise, the sludge cannot be transported and comprehensively utilized.

The method for dewatering the sludge generally comprises sludge concentration, natural drying method, mechanical dewatering and the like. Among them, sludge concentration is the most economical and effective method for reducing the volume of sludge, and is indispensable regardless of the way the sludge is finally treated. Natural drying can be divided into a sand drying field and a drying plant. The former is used for dehydration of grit in grit chamber, and the latter is used for dehydration of primary precipitated sludge, humic sludge, nitrified sludge, chemical sludge and mixed sludge. However, as the properties of the sludge are different from the local weather conditions, the water dehydrated by permeation, evaporation and skimming are also different, and the actual dehydration effect is difficult to control. In addition, the natural drying dehydration has wide occupied area, long period and large maintenance and management workload, and the later-stage sludge is putrefactive to generate malodor, so that mosquitoes and flies are bred, and the surrounding environmental sanitation is greatly influenced. Mechanical dehydration is a method commonly adopted in all countries of the world at present, and common dehydration machines are as follows: vacuum filters, centrifuges, plate and frame filter presses, belt dehydrators, and the like.

Vacuum filter: the structure is not airtight, harmful gas is difficult to collect, filter cloth is difficult to clean, and the energy consumption of a vacuum pump is high;

centrifuge: the device has the advantages of high power consumption, high noise and severe vibration, and is not suitable for solid-liquid separation with approximate specific gravity.

The plate-and-frame filter press is intermittent solid-liquid separation equipment, and has low efficiency due to intermittent operation, and cannot meet the treatment capacity of a large-scale sewage plant.

The belt filter press mainly uses the tension and pressure of filter cloth to apply pressure on the filter cloth to dehydrate the sludge, does not need vacuum or pressurizing equipment, has low power consumption and can be operated continuously.

Therefore, the prior sludge treatment equipment has rough mechanical structure, wide occupied area (split type), and lower dehydration efficiency and treatment capacity. Therefore, those skilled in the art have to develop a sludge treatment system with compact structure, small occupied area, high dewatering efficiency and good sludge treatment capacity.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the invention provides a sludge step-by-step separation system, which aims to overcome the defects of wide occupied area and lower dehydration efficiency and treatment capacity in the prior art.

The technical scheme adopted for solving the technical problems is as follows: a sludge progressive separation system comprises a sludge thickener, an integrated dosing device, a mixing pipeline, a sludge modulation treatment device and a low-temperature dryer;

the sludge thickener is used for separating interstitial water from sludge particles in the sewage, accelerating the descending of the sludge and conveying the concentrated muddy water into the mixing pipeline through the pipeline;

the integrated dosing device is used for dosing and preparing PAM medicament in the solution box, diluting the PAM medicament by clear water and then conveying the diluted PAM medicament into the mixing pipeline;

the mixing pipeline is used for mixing the diluted PAM medicament and the concentrated muddy water in the mixing pipeline and conveying the diluted PAM medicament and the concentrated muddy water into the sludge modulation treatment device;

the sludge preparation treatment device comprises a preparation tank and a belt filter press, wherein the preparation tank comprises a tank body and a water filtering component arranged in the tank body, the water filtering component is used for filtering out free water and interstitial water in sewage and overflowing the residual sludge out of the preparation tank into the belt filter press;

the novel filter press is characterized in that a first conveying belt, a second conveying belt and a third conveying belt are arranged in the belt filter press, the first conveying belt is transversely arranged above the inside of the belt filter press, the output end of the first conveying belt is arranged above the input end of the second conveying belt, the output end of the second conveying belt is arranged above the output end of the third conveying belt, the lower half part of the second conveying belt is gradually close to and partially overlapped with the upper half part of the third conveying belt, a wedge-shaped dewatering area is formed by the parts, close to each other, of the lower half part of the second conveying belt and the upper half part of the third conveying belt, the overlapped parts of the second conveying belt and the third conveying belt are pressed to form an S-shaped squeezing dewatering area through a plurality of squeezing rollers, and the tail ends of the first conveying belt, the second conveying belt and the third conveying belt are provided with a discharging mechanism;

the low-temperature dryer is used for condensing, dehumidifying and drying mud cakes conveyed by the belt filter press by using a dehumidifying heat pump through hot air circulation.

Further, the drainage subassembly includes stirring paddle, a plurality of rotating ring and quiet ring, stirring paddle vertically locate in the jar body with the jar body rotates to be connected, a plurality of rotating ring and quiet ring interval are located the stirring paddle outside, a plurality of rotating ring and quiet ring clearance fit each other, a plurality of quiet ring are all fixed in the jar body, a plurality of rotating ring internal face and stirring paddle outward flange fixed connection, a plurality of quiet ring and rotating ring form a filter-pressing chamber with stirring paddle cooperation, filter-pressing chamber bottom is equipped with the shrouding, be equipped with on the shrouding with the first feed inlet of mixing pipeline intercommunication, filter-pressing chamber top be equipped with be used for with belt filter press intercommunication's first discharge gate.

Further, the sludge thickener comprises a steady flow barrel, a water inlet pipe is arranged above the steady flow barrel, a main shaft is arranged at the center of the steady flow barrel, a plurality of concentration grid bars are arranged on the side wall of the main shaft, the bottom of the steady flow barrel is of a cone-shaped structure which is downwards arranged, a sludge outlet is formed in the lowest position of the cone-shaped structure, a sludge screw pump is arranged at the sludge outlet, the output end of the sludge screw pump is connected with a pipeline mixer, and a first mud scraping plate matched with the cone-shaped structure is arranged at the bottom of the concentration grid bars.

Further, integration dosing device includes the solution case, preparation groove, curing tank and holding tank have been set gradually along medicament direction of delivery in the solution case, all be equipped with the puddler in preparation groove, curing tank and the holding tank, be equipped with level sensor in the holding tank, preparation groove top is equipped with the feed inlet, be connected with first clear water pipe and dry machine of throwing on the feed inlet, be equipped with the solenoid valve on first clear water pipe and the dry machine of throwing, level sensor and solenoid valve signal connection, holding tank and mixing pipeline intercommunication.

Further, a dosing screw pump and an electromagnetic flowmeter are arranged between the storage tank and the mixing pipeline, a second clear water pipe is further connected to the mixing pipeline, and an electromagnetic valve and a rotameter are arranged on the second clear water pipe.

Further, the lower end of the stirring blade in the conditioning tank is provided with a second mud scraping plate matched with the bottom of the conditioning tank, and the bottom of the conditioning tank is provided with a first return pipe communicated with a steady flow barrel of the sludge thickener.

Further, the first conveyor belt is inclined from bottom to top in the sludge conveying direction.

Further, the plurality of press rolls in the S-shaped press dewatering zone are arranged in order of diameter from large to small along the direction of the sludge conveying belt.

Further, water collecting tanks are arranged below the first conveying belt, below the second conveying belt and below the third conveying belt, outlets of the water collecting tanks extend to the bottom of the belt filter press, and a second return pipe communicated with a steady flow barrel of the sludge thickener is arranged at the bottom of the belt filter press.

Further, all be equipped with washing unit above first conveyer belt lower half, second conveyer belt upper half and third conveyer belt lower half, washing unit includes the wash pipe, the interval is provided with a plurality of nozzles on the wash pipe, every overlap each other between the nozzle spray radius, every nozzle spray range covers whole conveyer belt width, the wash pipe upper cover is equipped with the washing guard shield, washing guard shield both sides limit extends to conveyer belt side direction, washing guard shield lateral wall is equipped with conveyer belt complex joint strip.

The beneficial effects of the invention are as follows: the sludge progressive separation system provided by the invention adopts the sludge thickener, the integrated dosing device, the mixing pipeline, the sludge modulation treatment device and the low-temperature dryer to carry out progressive dehydration treatment on sewage, has compact structure, stable production and strong dehydration and treatment capacity, and greatly improves economic benefits.

Drawings

The invention is further described below with reference to the drawings and examples.

FIG. 1 is a schematic view of a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of a sludge thickener;

FIG. 3 is a schematic structural view of an integrated dosing device;

FIG. 4 is a schematic diagram of the structure of the brewing canister;

FIG. 5 is an enlarged schematic view of A in FIG. 4;

FIG. 6 is a schematic view of a belt filter press;

fig. 7 is a schematic structural view of the flushing device.

In the figure: 1. 1a, a steady flow barrel, 1b, a water inlet pipe, 1c, a main shaft, 1d, a concentration grid, 1e, a mud outlet, 1f, a sludge screw pump, 1g, a first mud scraping plate, 2, an integrated dosing device, 2a, a solution tank, 2b, a preparation tank, 2c, a curing tank, 2d, a storage tank, 2e, a liquid level sensor, 2f, a feeding port, 2g, a first clear water pipe, 2h, a dry feeding machine, 2i, a dosing screw pump, 2j, an electromagnetic flowmeter, 2k, a second clear water pipe, 2l, a rotor flowmeter, 3, a mixing pipe, 4, a modulation tank, 4a, a tank body, 4b, stirring paddles, 4c, a movable ring, 4d, a stationary ring, 4e, a filter pressing cavity, 4f, a sealing plate, 4g, a first feeding hole, 4h, a first discharging hole, 4i, a second mud scraping plate, 5, a belt filter press, 5a, a first conveying belt, 5b, a second conveying belt, 5c, a third conveying belt, 5d, a wedge-shaped dewatering area, 5e, an S-shaped squeezing dewatering area, 5f, a squeezing roller, 6, a flushing device, 6a, a flushing pipe, 6b, a nozzle, 6c, a flushing shield, 6d, a sealing rubber strip, 6e, a water collecting tank and 7, and a low-temperature dryer.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention.

As shown in fig. 1 to 7, the sludge progressive separation system comprises a sludge thickener 1, an integrated dosing device 2, a mixing pipeline 3, a sludge modulation treatment device and a low-temperature dryer 7;

the sludge thickener 1 is used for separating interstitial water from sludge particles in sewage, accelerating the descending of sludge and conveying concentrated muddy water into the mixing pipeline 3 through a pipeline;

the integrated dosing device 2 is used for dosing and preparing PAM medicament in the solution tank 2a, diluting the PAM medicament with clear water and then conveying the diluted PAM medicament into the mixing pipeline 3;

the mixing pipeline 3 is used for mixing the diluted PAM medicament and the concentrated muddy water in the mixing pipeline 3 and conveying the diluted PAM medicament and the concentrated muddy water into the sludge modulation treatment device;

the sludge preparation treatment device comprises a preparation tank 4 and a belt filter press 5, wherein the preparation tank 4 comprises a tank body 4a and a water filtering component arranged in the tank body 4a, the water filtering component is used for filtering out free water and interstitial water in sewage and overflowing the residual sludge out of the preparation tank into the belt filter press 5;

a first conveyer belt 5a, a second conveyer belt 5b and a third conveyer belt 5c are arranged in the belt filter press 5, the first conveyer belt 5a is transversely arranged above the inside of the belt filter press 5, the output end of the first conveyer belt 5a is arranged above the input end of the second conveyer belt 5b, the output end of the second conveyer belt 5b is arranged above the third output end, the lower half part of the second conveyer belt 5b and the upper half part of the third conveyer belt 5c are gradually close to each other and partially overlapped, a wedge-shaped dewatering area 5d is formed by the parts of the lower half part of the second conveyer belt 5b and the upper half part of the third conveyer belt 5c, the overlapped parts of the second conveyer belt 5b and the third conveyer belt 5c are pressed by a plurality of pressing rollers 5f to form an S-shaped pressing dewatering area 5e, the whole first conveyer belt 5a, the second conveyer belt 5b and the third conveyer belt 5c are formed by filter cloth, and a discharging mechanism is arranged at the tail ends of the first conveyer belt 5a, the second conveyer belt 5b and the third conveyer belt 5c and a discharging mechanism is matched with the conveyer belt;

and the low-temperature dryer 7 is used for condensing, dehumidifying and drying mud cakes conveyed by the belt filter press 5 by using a dehumidifying heat pump through hot air circulation.

The water filtering assembly comprises a stirring blade 4b, a plurality of moving rings 4c and a stationary ring 4d, wherein the stirring blade 4b is vertically arranged in a tank body 4a and is in rotary connection with the tank body 4a, the moving rings 4c and the stationary ring 4d are arranged on the outer side of the stirring blade 4b at intervals, the moving rings 4c and the stationary ring 4d are in clearance fit with each other, the stationary ring 4d is fixed in the tank body 4a, the inner wall surface of the moving rings 4c is fixedly connected with the outer edge of the stirring blade 4b, the stationary rings 4d and the moving rings 4c are matched with the stirring blade 4b to form a filter pressing cavity 4e, a sealing plate 4f is arranged at the bottom of the filter pressing cavity 4e, a first feed inlet 4g communicated with the mixing pipeline 3 is arranged on the sealing plate 4f, and a first discharge outlet 4h communicated with the belt filter press 5 is arranged on the top end of the filter pressing cavity 4 e.

The sludge thickener 1 comprises a steady flow barrel 1a, a water inlet pipe 1b is arranged above the steady flow barrel 1a, a main shaft 1c is arranged in the center of the steady flow barrel 1a, a plurality of concentrated grid bars 1d are arranged on the side wall of the main shaft 1c, the bottom of the steady flow barrel 1a is of a downward conical structure, a sludge outlet 1e is formed in the lowest position of the conical structure, a sludge screw pump 1f is arranged at the sludge outlet 1e, the output end of the sludge screw pump 1f is connected with a pipeline mixer, and a first mud scraping plate 1g matched with the conical structure is arranged at the bottom of the concentrated grid bars 1 d.

The integrated dosing device 2 comprises a solution tank 2a, a preparation tank 2b, a curing tank 2c and a storage tank 2d are sequentially arranged in the solution tank 2a along the conveying direction of the medicament, stirring rods are arranged in the preparation tank 2b, the curing tank 2c and the storage tank 2d, a liquid level sensor 2e is arranged in the storage tank 2d, a feeding port 2f is arranged above the preparation tank 2b, a first clear water pipe 2g and a dry throwing machine 2h are connected to the feeding port 2f, electromagnetic valves are arranged on the first clear water pipe 2g and the dry throwing machine 2h, the liquid level sensor 2e is in signal connection with the electromagnetic valves, and the storage tank 2d is communicated with a mixing pipeline 3.

A dosing screw pump 2i and an electromagnetic flowmeter 2j are arranged between the storage tank 2d and the mixing pipeline 3, a second clear water pipe 2k is further connected to the mixing pipeline 3, and an electromagnetic valve and a rotameter 2l are arranged on the second clear water pipe 2 k.

The lower end of the stirring blade 4b in the conditioning tank is provided with a second mud scraping plate 4i matched with the bottom of the modulating tank 4, and the bottom of the modulating tank 4 is provided with a first return pipe communicated with the steady flow barrel 1a of the sludge thickener 1.

The first conveyor belt 5a is inclined from bottom to top in the sludge conveying direction.

The plurality of press rolls 5f in the S-shaped press dewatering zone 5e are arranged in order of diameter from large to small in the direction of the sludge conveyance belt.

A water collecting tank 6e is arranged below the first conveying belt 5a, below the upper half part of the second conveying belt 5b and below the lower half part of the third conveying belt 5c, an outlet of the water collecting tank 6e extends to the bottom of the belt filter press 5, and a second backflow pipe communicated with the steady flow barrel 1a of the sludge thickener 1 is arranged at the bottom of the belt filter press 5.

The washing device 6 is arranged above the lower half part of the first conveying belt 5a, the upper half part of the second conveying belt 5b and the lower half part of the third conveying belt 5c, the washing device 6 comprises a washing pipe 6a, a plurality of nozzles 6b are arranged on the washing pipe 6a at intervals, the spraying radiuses of the nozzles 6b are mutually overlapped, the spraying range of each nozzle 6b covers the width of the whole conveying belt, a washing shield 6c is covered on the washing pipe 6a, two sides of the washing shield 6c extend towards the side direction of the conveying belt, and sealing rubber strips 6d matched with the conveying belt are arranged on the side walls of the washing shield 6 c.

The working process comprises the following steps:

sewage enters the steady flow barrel 1a through the water inlet pipe 1b of the sludge thickener 1, the motor drives the central main shaft 1c to rotate clockwise, and the main shaft 1c drives the concentration grid bars 1d to rotate, so that separation of interstitial water and sludge particles is facilitated, and the sludge is accelerated to descend. The first mud scraping plate 1g at the bottom of the main shaft 1c scrapes the sludge at the bottom of the steady flow barrel 1a into the sludge outlet 1e, and the sludge is discharged by the sludge screw pump 1 f.

The preparation of the medicament of the integrated medicament adding device 2 is completed by gradually treating a preparation tank 2b, a curing tank 2c and a storage tank 2d in a solution tank 2 a. The preparation tank 2b, the curing tank 2c and the storage tank 2d are separated, so that short flow is avoided in the production process of the medicament. The control box of the integrated dosing device 2 is connected with a liquid level meter on a storage tank, once the liquid level reaches a low level, an electromagnetic valve on a first clear water pipe 2g is triggered to be opened, and an electromagnetic valve on a dry projector 2h is started to start dispensing; once the liquid level gauge reaches the high position, the electromagnetic valve is stopped, and the dry projector 2h also stops dispensing; the liquid level gauge is ultra-low, the dosing screw pump 2i is stopped, and the stirrer always works in the preparation and medicament use processes.

After PAM medicament is prepared, diluting with clear water according to the process requirement; the diluted reagent and the concentrated sludge discharged by the sludge screw pump 1f are pretreated by a mixing pipeline 3 and then enter a conditioning tank for treatment. The flocculation holding group is alum-shaped under the holding of the agent, and free water and interstitial water are filtered out from gaps between the dynamic and static rings 4d in the water filtering component, and the residual sludge overflows to the first discharge hole 4h of the tempering tank.

Because the first discharge hole 4h of the tempering tank is directly connected with the inlet of the totally-enclosed belt filter press 5 by a flange, the pre-concentrated sludge enters the totally-enclosed belt filter press 5 along the trend, the sludge is uniformly transported by the first conveyor belt 5a, the section has long small-angle ascending motion, and free water and floccules are secondarily separated under the action of gravity, so that most of free water in materials is removed. The material is substantially lost in fluidity and scraped by the scraper onto the second conveyor belt 5b, which second conveyor belt 5b will be boring to transport to the wedge-shaped dewatering space 5d. The materials enter a wedge-shaped dewatering area 5d, the slurry is filtered in the wedge-shaped area to be further leveled and uniform, meanwhile, the materials are slightly extruded by a second conveying belt 5b and a third conveying belt 5c, a wedge-shaped space formed by the second conveying belt 5b and the third conveying belt 5c is from large to small, finally, the second conveying belt 5b and the third conveying belt 5c are folded, so that the extrusion force of the slurry clamped between the two conveying belts is gradually increased, water is continuously discharged from the slurry, and the slurry completely loses fluidity at the moment and is ready for the next step into the squeezing dewatering area.

The press rollers 5f of the press dewatering area are arranged in order from large to small in diameter, the press force applied to the materials is gradually increased from small, and most of intercellular water is removed after the press rollers 5f are arranged in S rows to press, stagger and shear the filter cake, so that press filtration dewatering is completed. When the filter belt passes through the discharging mechanism, mud cakes are scraped off from the third conveying belt 5c by a scraper.

After the first, second and third conveyor belts 5a, 5b and 5c are washed and regenerated, they return to the original positions again, thus completing the primary sludge dewatering cycle. Wherein the first conveyor belt 5a, the second conveyor belt 5b and the third conveyor belt 5c are provided with flushing devices 6, each flushing device 6 consisting of a flushing pipe 6a, a nozzle 6b, a flushing hood 6c, a rubber sealing strip. The nozzles 6b are orderly arranged, the injection range covers the whole filter belt width, the injection radiuses of each nozzle 6b are mutually overlapped, and the nozzles 6b are connected with the water inlet pipe 1b by adopting pipe threads, so that the replacement is convenient; the periphery of the flushing hood 6c, which is in contact with the conveyor belt, is provided with sealing rubber to prevent the flushing water from splashing and to wet the mud cake. The water collecting tanks 6e provided on the first, second and third conveyor belts 5a, 5b, 5c collect free water and intercellular water for sludge concentration and pressure filtration, and collect filter belt washing water and residual sludge.

The mud cake (the water content is 72% -75%) dehydrated by the pre-concentration totally-enclosed belt filter press 5 is conveyed to a sludge low-temperature desiccator by a shaftless screw conveyor. The dried mud cake (the water content is 25% -40%) is placed in a sludge bucket and transported to an incineration plant for treatment by a vehicle.

Directions and references (e.g., up, down, left, right, etc.) in this invention may be used only to aid in the description of features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (7)

1. A sludge progressive separation system, characterized in that: comprises a sludge thickener (1), an integrated dosing device (2), a mixing pipeline (3), a sludge modulation treatment device and a low-temperature dryer (7);

the sludge thickener (1) is used for separating interstitial water from sludge particles in the sewage, accelerating the descending of the sludge and conveying the concentrated sludge into the mixing pipeline (3) through the pipeline;

the integrated dosing device (2) is used for dosing and preparing PAM medicament in the solution tank (2 a), diluting the PAM medicament with clear water and then conveying the diluted PAM medicament into the mixing pipeline (3);

the mixing pipeline (3) is used for mixing the diluted PAM medicament and the concentrated muddy water in the mixing pipeline (3) and conveying the mixture into the sludge modulation treatment device;

the sludge preparation treatment device comprises a preparation tank (4) and a belt filter press (5), wherein the preparation tank (4) comprises a tank body (4 a) and a water filtering component arranged in the tank body (4 a), the water filtering component is used for filtering out free water and interstitial water in sewage and overflowing the residual sludge out of the preparation tank into the belt filter press (5);

a first conveying belt (5 a), a second conveying belt (5 b) and a third conveying belt (5 c) are arranged in the belt filter press (5), the first conveying belt (5 a) is transversely arranged above the inside of the belt filter press (5), the output end of the first conveying belt (5 a) is arranged above the input end of the second conveying belt (5 b), the output end of the second conveying belt (5 b) is arranged above the third conveying belt (5 c), the lower half part of the second conveying belt (5 b) is gradually close to and partially overlaps with the upper half part of the third conveying belt (5 c), the parts of the lower half part of the second conveying belt (5 b) and the upper half part of the third conveying belt (5 c) which are close to each other form a wedge-shaped dewatering area (5 d), the overlapped parts of the second conveying belt (5 b) and the third conveying belt (5 c) are pressed by a plurality of pressing rollers (5 f) to form an S-shaped dewatering area (5 e), and the first conveying belt (5 a), the second conveying belt (5 b) and the third conveying belt (5 c) are provided with a filter cloth conveying mechanism and a third conveying belt (5 c);

the low-temperature dryer (7) is used for condensing, dehumidifying and drying mud cakes conveyed by the belt filter press (5) by using a dehumidifying heat pump through hot air circulation;

the water filtering assembly comprises stirring paddles (4 b), a plurality of movable rings (4 c) and stationary rings (4 d), wherein the stirring paddles (4 b) are vertically arranged in a tank body (4 a) and are rotationally connected with the tank body (4 a), the movable rings (4 c) and the stationary rings (4 d) are arranged at intervals outside the stirring paddles (4 b), the movable rings (4 c) and the stationary rings (4 d) are in clearance fit with each other, the stationary rings (4 d) are fixed in the tank body (4 a), the inner wall surfaces of the movable rings (4 c) are fixedly connected with the outer edges of the stirring paddles (4 b), the stationary rings (4 d) and the movable rings (4 c) are matched with the stirring paddles (4 b) to form a filter pressing cavity (4 e), a sealing plate (4 f) is arranged at the bottom of the filter pressing cavity (4 e), a first feed inlet (4 g) communicated with a mixing pipeline (3) is arranged on the sealing plate (4 f), and the top end (4 e) is provided with a belt type discharge outlet (5 h) communicated with the filter press (4 h);

the sludge thickener (1) comprises a steady flow barrel (1 a), a water inlet pipe (1 b) is arranged above the steady flow barrel (1 a), a main shaft (1 c) is arranged at the center of the steady flow barrel (1 a), a plurality of concentrating grid bars (1 d) are arranged on the side wall of the main shaft (1 c), the bottom of the steady flow barrel (1 a) is of a cone-shaped structure which is downwards arranged, a sludge outlet (1 e) is arranged at the lowest part of the cone-shaped structure, a sludge screw pump (1 f) is arranged at the sludge outlet (1 e), the output end of the sludge screw pump (1 f) is connected with a pipeline mixer, and a first scraper (1 g) matched with the cone-shaped structure is arranged at the bottom of the concentrating grid bars (1 d);

the integrated dosing device (2) comprises a solution tank (2 a), a preparation tank (2 b), a curing tank (2 c) and a storage tank (2 d) are sequentially arranged in the solution tank (2 a) along the drug conveying direction, stirring rods are arranged in the preparation tank (2 b), the curing tank (2 c) and the storage tank (2 d), a liquid level sensor (2 e) is arranged in the storage tank (2 d), a feeding port (2 f) is arranged above the preparation tank (2 b), a first clear water pipe (2 g) and a dry projector (2 h) are connected to the feeding port (2 f), an electromagnetic valve is arranged on the first clear water pipe (2 g) and the dry projector (2 h), the liquid level sensor (2 e) is in signal connection with the electromagnetic valve, and the storage tank (2 d) is communicated with a mixing pipeline (3).

2. A progressive sludge separation system as claimed in claim 1 wherein: be equipped with between holding tank (2 d) and mixing pipeline (3) and add medicine screw pump (2 i) and electric-magnetic flowmeter (2 j), still be connected with second clear water pipe (2 k) on mixing pipeline (3), be equipped with solenoid valve and rotameter (2 l) on second clear water pipe (2 k).

3. A progressive sludge separation system as claimed in claim 1 wherein: the lower end of a stirring blade (4 b) in the modulation tank is provided with a second mud scraping plate (4 i) matched with the bottom of the modulation tank (4), and the bottom of the modulation tank (4) is provided with a first return pipe communicated with a steady flow barrel (1 a) of the sludge thickener (1).

4. A progressive sludge separation system as claimed in claim 1 wherein: the first conveyor belt (5 a) is inclined from bottom to top along the sludge conveying direction.

5. A progressive sludge separation system as claimed in claim 1 wherein: a plurality of press rolls (5 f) in the S-shaped press dewatering zone (5 e) are arranged in order of diameter from large to small along the direction of the sludge conveying belt.

6. A progressive sludge separation system as claimed in claim 1 wherein: the utility model discloses a sludge thickener, including first conveyer belt (5 a), second conveyer belt (5 b), third conveyer belt (5 c), water catch bowl (6 e) are all equipped with below first conveyer belt (5 a), below second conveyer belt (5 b) upper half and below third conveyer belt (5 c) lower half, water catch bowl (6 e) export extends to belt filter press (5) bottom, belt filter press (5) bottom is equipped with the second back flow with stationary flow bucket (1 a) intercommunication of sludge thickener (1).

7. A progressive sludge separation system as claimed in claim 6 wherein: the utility model discloses a conveyer belt, including first conveyer belt (5 a), second conveyer belt (5 b), third conveyer belt (5 c), first conveyer belt (5 a) lower half top, second conveyer belt (5 b) upper half top and third conveyer belt (5 c) lower half top all are equipped with washing unit (6), washing unit (6) are including washing pipe (6 a), the interval is provided with a plurality of nozzles (6 b) on washing pipe (6 a), every between nozzle (6 b) spraying radius overlap each other, every nozzle (6 b) spraying range covers whole conveyer belt width, washing pipe (6 a) upper cover is equipped with washing guard shield (6 c), washing guard shield (6 c) both sides limit is to conveyer belt side direction extension, washing guard shield (6 c) lateral wall is equipped with conveyer belt complex joint strip (6 d).