CN113292219B

CN113292219B - V-shaped belt type dewatering equipment capable of self-adapting to sludge concentration and application thereof

Info

Publication number: CN113292219B
Application number: CN202110615840.9A
Authority: CN
Inventors: 阮燕霞; 魏宏斌; 张�杰; 唐秀华; 刘霞
Original assignee: Shanghai Shenyao Environmental Protection Engineering Co ltd
Current assignee: Shanghai Shenyao Environmental Protection Engineering Co ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-10-11
Anticipated expiration: 2041-06-02
Also published as: CN113292219A

Abstract

The invention provides a V-shaped belt type dewatering device capable of adapting to sludge concentration, which is sequentially provided with a first mixing unit, a second mixing unit and a filter-pressing dewatering unit along a sludge feeding direction, wherein the first mixing unit is sequentially provided with a first mixing pipe body and a second mixing pipe body along the sludge feeding direction, the second mixing unit is a pipeline mixing part or a mechanical mixing part, and the filter-pressing dewatering unit comprises a rack and a filter cloth operation area arranged in the rack. The invention further provides a dehydration method capable of adapting to the sludge concentration. The invention provides V-shaped belt type dehydration equipment adaptive to sludge concentration and application thereof, which have the advantages of low energy consumption of the equipment, low requirement on sites, convenient migration and convenient subsequent treatment, and are particularly suitable for the dehydration treatment of sludge and solid waste generated by small-sized urban sewage plants.

Description

V-shaped belt type dewatering equipment capable of self-adapting to sludge concentration and application thereof

Technical Field

The invention belongs to the technical field of sludge treatment, and relates to V-shaped belt type dewatering equipment capable of self-adapting to sludge concentration and application thereof.

Background

With the continuous development of urbanization and the continuous increase of urban population, the discharge amount of urban sewage is increasing, and the number of small water plants in cities is increasing, so that a large amount of excess sludge with high surface humidity is generated. The treatment of solid wastes follows the principles of resource utilization, reduction and harmlessness, the reduction of the moisture content of the solids can not only reduce the transportation and disposal costs, but also carry out secondary utilization on the solid wastes, such as composting treatment, can reduce the odor problem to the minimum and make the sludge treatment easier. Due to the complex manner and product structure of sludge dewatering, modern sewage plant solids dewatering often requires significant time and effort on the part of personnel.

Generally, sludge is pretreated first, and then dewatered after the dewatering performance is improved. The most common pretreatment method is the addition of inorganic salts or polymeric coagulants. The dehydration mode is divided into a natural drying method and a mechanical dehydration method, and the dehydration effect of the sludge natural drying is influenced by local rainfall, evaporation capacity, air temperature, humidity and the like. The natural drying method is generally suitable for being adopted in dry, rain-less and sandy soil areas. Mechanical dewatering methods include filtration and centrifugation. The filtration is to filter the wet sludge by a filter layer, so that the water permeates the filter layer, and the dewatered sludge is intercepted on the filter layer. The centrifugal method is to separate mud from water by means of different centrifugal tendencies generated by the specific gravity difference between solid and liquid in sludge.

Chinese patent CN105658586a discloses a belt filter press, sludge enters from a lower sludge inlet, is wrapped in two filter cloths, and is dewatered by extruding the filter cloths through a roller, and finally, sludge cakes are discharged through a discharge outlet. The device comprises two filter cloths, the device can be compact by increasing the times of winding the filter belts on the central roller, and the internal friction of the device is reduced by adding an intermediate piece between one pair of filter cloths and the other pair of filter cloths.

The common belt filter press has the advantages of low overall noise, high process automation degree and low maintenance cost. But has the defects of large floor area, high operating cost, large flushing water quantity and the like. For small town sewage plants, the device can reduce the water content of the sludge to be below a target value, but the device has the problems of equipment volume, energy consumption and water consumption, and is not suitable for large-scale popularization.

Chinese patent CN210065513U discloses a centrifugal dehydration multidirectional sludge discharge device, sludge is fed through a horizontal screw conveyor, and enters a transport vehicle or other devices through a plurality of discharge ports after dehydration. The device is provided with a plurality of sludge outlets, and different outlets can be mutually standby, so that the overall operation efficiency of the device is ensured.

The centrifugal dehydrator has the advantages of moderate floor area, low required flushing water amount, less required operators, equipment cost and operation cost similar to those of a belt type filter press, high consumption of pretreatment chemicals and high generated noise. Although the centrifugal dehydrator can discharge sludge in multiple directions, the problems of large dosage of the medicament at the front end and excessive noise during operation are still not negligible for sewage plants.

Chinese patent CN104922962A discloses a single filter belt type filter press, which adopts a single filter belt and is filter-pressed and dehydrated by the filter belt, wherein the squeezing force is provided by a metal mesh belt, dehydrated materials are wrapped by the filter belt and the metal mesh belt and are filter-pressed and dehydrated by a high-pressure filter pressing area under a squeezing roller, and the magnitude of the squeezing force is adjusted by a metal mesh belt tensioning roller.

The single filter belt filter press fundamentally overcomes the defects of belt folding and bulging caused by different rotating radiuses of the upper filter belt and the lower filter belt of the filter pressing area and different linear speeds of the filter pressing area when the traditional single filter belt filter press uses double-layer filter belts, the structure of the whole press is simplified to the maximum extent, fault points are greatly reduced, the operation reliability of the whole press is obviously improved, and the manufacturing cost is greatly reduced. But only adopts mechanical filter pressing, has larger requirement on the flushing water quantity and higher required energy consumption, and is difficult to realize the energy-saving and decrement treatment of the sludge.

The above patents all improve the sludge dewatering equipment to some extent, but there is still a need to reduce the floor space and operating costs of the sludge dewatering equipment. Because the quality of inlet water of different sewage plants is different greatly, various indexes of sludge of different sewage plants are different, and the wide applicability of the device needs to be ensured.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide the V-shaped belt type dewatering equipment capable of adapting to the sludge concentration and the application thereof, which can dewater the sludge until the water content is less than or equal to 80 percent, completely meet the requirement of subsequent treatment, can be widely applied to dewatering treatment of various types of sludge or solid wastes, and is particularly suitable for dewatering treatment of sludge in small and medium town sewage plants with inlet water quality fluctuation.

In order to achieve the above and other related objects, a first aspect of the present invention provides a V-belt dewatering device with adaptive sludge concentration, which comprises a first mixing unit, a second mixing unit, and a filter-press dewatering unit, wherein the first mixing unit comprises a first mixing pipe and a second mixing pipe in sequence along a sludge feeding direction, the second mixing unit is a pipe mixing part or a mechanical mixing part, and the filter-press dewatering unit comprises a frame and a filter cloth operation area disposed in the frame.

Preferably, the inlet end of the first mixing pipe body is provided with a sludge inlet.

Preferably, a first flocculating agent inlet pipe is arranged on the first mixing pipe body.

More preferably, a plurality of medicine outlet holes are formed in the side wall of the discharge end of the first flocculating agent introducing pipe.

Preferably, a baffle is arranged in the first mixing pipe body, a porous partition plate is arranged between the first mixing pipe body and the second mixing pipe body, and the baffle is a cone and the bottom surface of the baffle is connected with the partition plate.

More preferably, the angle of the cone angle of the baffle is 90 to 120 °.

More preferably, the baffle is circular, and the diameter of the baffle is not greater than the inner diameter of the second mixing tube.

More preferably, the thickness of the separator is 50 to 150mm.

Preferably, a flow sensor and a concentration sensor are arranged on the first mixing pipe body.

Preferably, the outlet end of the second mixing pipe body is provided with a sludge discharge port.

Preferably, a second flocculating agent inlet pipe is arranged on the second mixing pipe body.

Preferably, the tube mixing section is a plurality of parallel rows of tubes.

Preferably, the mechanical mixing section is a tank reactor.

Preferably, stirring mechanisms are arranged in the second mixing pipe body, the pipeline mixing part and the mechanical mixing part.

More preferably, the stirring mechanism is a frame or paddle type mechanical stirring device.

Further preferably, when the stirring mechanism is a paddle type mechanical stirring device, the stirring mechanism comprises a stirring paddle, and the stirring paddle is externally connected with a motor.

Most preferably, the blade shape of the paddle is selected from one of a straight edge, a serrated edge, or a wavy edge.

Preferably, the filter cloth operation area is sequentially provided with a material distribution module, a first drag roller, a material pressing section and a second drag roller along the sludge feeding direction, and the first drag roller and the second drag roller form a filter cloth operation loop along the filter cloth operation direction.

More preferably, the material distribution module is at least one feed pipe.

More preferably, an upper water collecting disc is arranged below the area between the first drag roll and the material pressing section.

More preferably, a pre-pressing module, a main pressing module and a final pressing module are sequentially arranged in the pressing section along the filter cloth running direction, the pre-pressing module is sequentially provided with a first pre-pressing roller and a second pre-pressing roller along the filter cloth running direction, the main pressing module is sequentially provided with a first main pressing roller and a second main pressing roller along the filter cloth running direction, the final pressing module is sequentially provided with a first final pressing roller, a second final pressing roller and a third final pressing roller along the filter cloth running direction, and a lower water collecting tray is arranged below the pressing section.

More preferably, the diameter of the first pre-press roll and the second pre-press roll is 258 to 288mm.

More preferably, the diameter of the first main pressure roller and the second main pressure roller is 258 to 288mm.

More preferably, the diameters of the first, second and third final pressing rollers are 158 to 182mm.

More preferably, the first drawing roller and the second drawing roller are externally wrapped with glue layers.

More preferably, the first and second tow rollers are externally connected with chains, the chains are meshed with chain wheels, and the chain wheels are externally connected with motors.

More preferably, a mud scraper is arranged below the second dragging roller, and a cleaning box, a deviation rectifying roller and a tensioning roller are sequentially arranged on the filter cloth of the second dragging roller moving towards the first dragging roller.

Further preferably, the cleaning box is located below the filter cloth.

More preferably, the diameter of the rectification roller is 63-102 mm.

Further preferably, the diameter of the tension roller is 158 to 182mm.

The invention provides a dewatering method of self-adapting sludge concentration, which adopts the V-shaped belt type dewatering equipment of the self-adapting sludge concentration and comprises the following steps:

1) Inputting the sludge into a first mixing unit, preliminarily mixing the sludge with a flocculating agent in a first mixing pipe body, inputting the sludge into a second mixing pipe body, and fully mixing the sludge with the flocculating agent to obtain a mixture;

2) Inputting the mixture into a second mixing unit for flocculation reaction to form sludge flocs;

3) And (4) conveying the sludge flocs into a filter-pressing dehydration unit for dehydration.

Preferably, in step 1), the flocculant is a conventionally used sludge flocculant. More preferably, the flocculant is Polyacrylamide (PAM).

Preferably, in step 1), the flocculant is introduced into the first mixing pipe body through a first flocculant introduction pipe, and the flocculant is introduced into the second mixing pipe body through a second flocculant introduction pipe.

Preferably, in the step 1), the dosage of the flocculant added into the first mixing pipe body is 3-5 per mill of the absolute dry amount of the sludge.

Preferably, in the step 3), the sludge floc is arranged on a filter cloth of a filter-pressing dehydration unit, and the running speed of the filter cloth is 3-6 m/min.

As described above, the V-belt type dewatering equipment capable of adapting to sludge concentration and the application thereof provided by the invention comprise sludge-drug mixing and belt type dewatering equipment for sludge, which are capable of adapting to sludge concentration, and have the following beneficial effects:

(1) According to the V-shaped belt type dewatering equipment capable of adapting to the sludge concentration, the flocculant is added into the first mixing unit through the agent adding pump to be mixed with the sludge, the first mixing unit adopts the flow and concentration sensor and the PLC automatic control system, the adding amount of the flocculant is automatically adjusted in real time according to the sludge concentration and flow change, the automation degree is high, the automatic adding of the flocculant according to the ratio is realized, the stability of the flocculation effect is ensured, the unattended operation is realized, and the manpower and the drug investment are saved.

(2) The V-shaped belt type dewatering equipment capable of adapting to the sludge concentration provided by the invention has the advantages that the occupied area of the equipment is small, the flocculation and sludge squeezing of sewage are integrated, the installed power is low, the adopted power distribution facility is not increased basically, the expansion of a sludge dewatering room is small or the area of a newly-built workshop is small.

(3) The V-shaped belt type dewatering equipment capable of adapting to the sludge concentration is installed on the ground, has low requirement on the site, is convenient to move, can be reasonably adjusted according to the requirement of a water plant, and is particularly suitable for dewatering treatment of sludge and solid waste generated by small-sized urban sewage plants.

(4) According to the invention, the efficient first mixing unit and the efficient second mixing unit are combined, sludge is fully mixed and then enters the filter pressing equipment, so that colloid destabilization is facilitated, the subsequent pressing capacity can be exerted to the maximum extent, the sludge dewatering effect is stable, and the sludge is not reduced when meeting water, so that the subsequent sludge treatment is more convenient.

(5) The V-shaped belt type dewatering equipment capable of adapting to the sludge concentration can freely combine the number of filter belts in the equipment according to the sludge amount, can realize parallel operation of a plurality of filter bags in the same equipment, and enhances the treatment capacity of the equipment.

(6) According to the V-shaped belt type dewatering equipment capable of adapting to the sludge concentration and the application thereof, the water consumption of the dewatering machine in backwashing is low, the water consumption can be greatly saved, less sewage is generated in the sludge squeezing process, and the subsequent treatment pressure is reduced.

(7) The V-shaped belt type dewatering equipment capable of self-adapting to the sludge concentration and the application thereof have the advantages of low energy consumption of the equipment, low power consumption of the equipment in operation and low energy input.

(8) The invention provides a V-shaped belt type dewatering device capable of self-adapting to sludge concentration and application thereof.

Drawings

FIG. 1 is a side view showing an overall structure of a mixing unit of a V-belt type dehydration apparatus adaptive to sludge concentration according to the present invention, which is a pipe mixing structure.

FIG. 2 is a top view of the overall structure of a mixing unit of the V-belt type dewatering equipment with adaptive sludge concentration in the form of a pipeline mixing structure according to the present invention.

FIG. 3 is a schematic diagram of a mixing unit of the present invention in a pipeline mixing configuration.

Fig. 4 is a side view showing the overall structure of a mixing unit of an adaptive sludge concentration V-belt type dewatering apparatus according to the present invention in a mechanical mixing structure.

FIG. 5 is a top view of the overall structure of a mixing unit of an adaptive sludge concentration V-belt type dewatering equipment according to the present invention, which is a mechanical mixing structure.

Reference numerals

1. Cloth module

2. First dragging roller

3. First prepressing roll

4. Second pre-press roll

5. First main press roll

6. Second main press roll

7. First final pressure roller

8. Second final pressure roller

9. Third final pressure roller

10. Second drag roller

11. Mud scraper

12. Deviation rectifying roller

13. Tension roller

14. Cleaning box

15. Upper water collecting tray

16. Lower catchment plate

17. Mud inlet

18. First mixing tube

19. Second mixing tube body

20. Sludge discharge port

21. First flocculating agent ingress pipe

22. Second flocculating agent ingress pipe

23. Partition plate

24. Baffle plate

25. Stirring mechanism

26. Second mixing unit

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1 to 5. It should be understood that the structures, ratios, sizes, etc. shown in the drawings and attached to the description are only for understanding and reading the disclosure of the present invention, and are not intended to limit the practical conditions of the present invention, so that the present invention has no technical significance, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical contents of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

The invention provides V-shaped belt type dewatering equipment capable of adapting to sludge concentration, which is shown in figures 1-5, and is sequentially provided with a first mixing unit, a second mixing unit 26 and a filter-pressing dewatering unit along a sludge feeding direction, wherein the first mixing unit is sequentially provided with a first mixing pipe body 18 and a second mixing pipe body 19 along the sludge feeding direction, the second mixing unit 26 is a pipeline mixing part or a mechanical mixing part, and the filter-pressing dewatering unit comprises a rack and a filter cloth running area arranged in the rack.

In the above-mentioned V-belt type dewatering equipment adaptive to sludge concentration, as shown in fig. 2, 3 and 5, the inlet end of the first mixing pipe body 18 is provided with a sludge inlet 17. For feeding the sludge to be treated.

In the V-belt dewatering apparatus adapted to the sludge concentration, as shown in fig. 2, 3 and 5, the first mixing pipe body 18 is provided with a first flocculant introduction pipe 21. The first flocculating agent introducing pipe 21 is communicated with the first mixing pipe 18 and is used for introducing a medicament so that the sludge and the medicament are mixed in the first mixing pipe 18. The first flocculating agent introducing pipe 21 is externally connected with a medicament adding pump, and medicaments are introduced through the medicament adding pump.

In a preferred embodiment, as shown in fig. 2, 3 and 5, the axis of the first mixing tube body 18 is perpendicular to the axis of the first flocculant introduction tube 21.

In a preferred embodiment, as shown in fig. 3, the side wall of the discharge end of the first flocculating agent introducing pipe 21 is provided with a plurality of drug outlet holes. The spacing distance between the adjacent medicine outlet holes is equal. Can realize multipoint symmetrical distribution and is beneficial to the preliminary mixing of the sludge and the flocculating agent.

In the V-belt type dewatering device adaptive to the sludge concentration, as shown in fig. 2, 3 and 5, a baffle 24 is arranged in the first mixing pipe body 18, a porous partition 23 is arranged between the first mixing pipe body 18 and the second mixing pipe body 19, the baffle 24 has a taper angle, and the bottom surface of the baffle 24 is connected with the partition 23. The baffle plate 24 causes the mixed liquid of the chemical and the sludge introduced through the first flocculant introduction pipe 21 to collide with each other to form turbulent flow, thereby mixing the mixture uniformly.

In a preferred embodiment, the angle of the cone angle of the baffle 24 is 90 to 120 °.

In a preferred embodiment, the baffle 23 is circular, the diameter of the baffle 23 being no greater than the inner diameter of the second mixing tube 19. The baffle 23 causes the sludge and flocculant mixture after diffusion to shrink sharply, further mixing. The conditioned sludge flows out through the partition plate 23 and is mixed with the flocculant introduced by the second flocculant introducing pipe 22 again, and the mixture is fully mixed under the mechanical stirring action.

In a preferred embodiment, the thickness of the partition 23 is 50 to 150mm.

In the above V-belt dewatering apparatus adaptive to sludge concentration, the first mixing pipe 18 is provided with a flow sensor and a concentration sensor. The flow sensor and the concentration sensor are both conventionally used. The device is used for automatically adjusting the dosage of a flocculating agent (PAM) in real time by monitoring the concentration and flow change of sludge under the regulation and control of a Programmable Logic Controller (PLC), and the dosage of the PAM is kept to be 3-5 per mill of the absolute dry weight of the sludge. Not only ensures the stability of the flocculation effect, but also realizes unattended operation.

In the V-belt dewatering device with adaptive sludge concentration, as shown in fig. 2, 3 and 5, the outlet end of the second mixing pipe 19 is provided with a sludge discharge port 20.

In the V-belt dewatering apparatus adapted to the sludge concentration, as shown in fig. 2, 3 and 5, the second mixing pipe body 19 is provided with a second flocculant introduction pipe 22. The second flocculating agent introducing pipe 22 is communicated with the second mixing pipe body 19 and used for introducing the medicament again, so that the sludge and the medicament are mixed again in the second mixing pipe body 19, and the flocculation effect is improved. The second flocculating agent introducing pipe 22 is externally connected with a medicament adding pump, and medicaments are introduced through the medicament adding pump.

The agent is a conventionally used flocculant for treating sludge.

The first mixing pipe 18 and the second mixing pipe 19 are fixedly connected by flange sealing. The first mixing pipe 18 and the second mixing pipe 19 are made of stainless steel.

In the above-described adaptive sludge concentration V-belt type dewatering apparatus, as shown in fig. 1 to 3, the pipe mixing part is a plurality of rows of parallel pipes.

In the above-described V-belt type dehydration apparatus adaptive to sludge concentration, as shown in fig. 4 to 5, the mechanical mixing part is a tank type reaction tank.

In the above-mentioned V-belt dewatering equipment adaptive to sludge concentration, the second mixing pipe body 19, the pipeline mixing part, and the mechanical mixing part are all provided with stirring mechanisms 25.

The stirring mechanism 25 is a frame type or paddle type mechanical stirring device, and is preferably a paddle type.

When the stirring mechanism 25 is a paddle type mechanical stirring device, the stirring mechanism 25 includes a stirring paddle, and the stirring paddle is externally connected with a motor. The stirring paddle is driven by a motor to rotate and stir, so that the sludge is fully mixed and thoroughly coagulated. The stirring paddle is connected with the motor through a connecting shaft.

In a further preferred embodiment, the blade shape of the stirring blade is selected from one of a straight edge, a serrated edge or a wavy edge.

The pipeline mixing part or the mechanical mixing part is selected according to the site requirement condition.

In the above-mentioned V-belt type dewatering apparatus adaptive to sludge concentration, as shown in fig. 1-2, 4-5, the frame is a closed housing. The material of the frame is 304 or 316L stainless steel. The shell is a 304 or 316L stainless steel shell sheet metal part.

In the above-mentioned V-belt dewatering equipment adaptive to sludge concentration, as shown in fig. 1-2 and 4-5, a cloth module 1, a first drag roller 2, a pressing section, and a second drag roller 10 are sequentially arranged in the filter cloth running region along the sludge feeding direction, and the first drag roller 2 and the second drag roller 10 form a filter cloth running loop along the filter cloth running direction.

In a preferred embodiment, as shown in fig. 2 and 4, the distribution module 1 is at least one feeding pipe. The inlet pipe is arranged according to the width of the sludge inlet amount and the filter cloth, can prevent sludge blockage, is not limited by the moisture content of the sludge, buffers the change of the sludge amount and uniformly discharges the sludge.

In a preferred embodiment, as shown in fig. 2 and 4, an upper water collecting tray 15 is arranged below the area between the first drag roll 2 and the nip section. For gravity dewatering of the sludge in this area, the water enters the upper catchment tray 15. At the same time, water carried over by the flushing cloth also enters the upper catchment tray 15. The upper water collecting tray 15 is made of 304 stainless steel.

In a preferred embodiment, as shown in fig. 1-2 and 4-5, a pre-pressing module, a main pressing module and a final pressing module are sequentially arranged in the pressing section along the filter cloth running direction, the pre-pressing module is sequentially provided with a first pre-pressing roller 3 and a second pre-pressing roller 4 along the filter cloth running direction, the main pressing module is sequentially provided with a first main pressing roller 5 and a second main pressing roller 6 along the filter cloth running direction, the final pressing module is sequentially provided with a first final pressing roller 7, a second final pressing roller 8 and a third final pressing roller 9 along the filter cloth running direction, and a lower water collecting tray 16 is arranged below the pressing section.

The filter cloth pre-pressing device comprises a first pre-pressing roller 3 and a second pre-pressing roller 4 in the pre-pressing module, a first main pressing roller 5 and a second main pressing roller 6 in the main pressing module, a first final pressing roller 7, a second final pressing roller 8 and a third final pressing roller 9 in the final pressing module, and filter cloth between adjacent pressing rollers is arranged in an S-shaped up-down staggered mode.

The contact surfaces of the first prepressing roller 3 and the second prepressing roller 4 in the prepressing module, the first main pressing roller 5 and the second main pressing roller 6 in the main pressing module, and the first final pressing roller 7, the second final pressing roller 8 and the third final pressing roller 9 in the final pressing module and the sludge are all made of 304 or 316L stainless steel.

The first prepressing roll 3 and the second prepressing roll 4 in the prepressing module, the first main pressing roll 5 and the second main pressing roll 6 in the main pressing module, and the first final pressing roll 7, the second final pressing roll 8 and the third final pressing roll 9 in the final pressing module are provided with bearings which adopt double-row roller bearings capable of aligning and are waterproof and splash-proof shells.

The lower water collecting disc 16 is used for collecting water after squeezing and dewatering in the pressing section.

In a preferred embodiment the diameter of the first pre-press roll 3 and the second pre-press roll 4 is 258 to 288mm. Used for pre-pressing sludge so that the sludge is wrapped in the filter cloth for primary dehydration.

In a preferred embodiment, the first and second main rolls 5 and 6 have a diameter of 258 to 288mm. The sludge dewatering device is used for squeezing water in the sludge to further dewater the sludge.

In a preferred embodiment, the diameters of the first, second and third final pressing rollers 7, 8 and 9 are 158 to 182mm. Used for final pressing and forming before sludge is discharged.

In a preferred embodiment, as shown in fig. 2 and 4, two sides of the filter cloth, which runs towards the pressing section by the first tow roller 2, gradually narrow in a V shape in the horizontal direction, and two sides of the filter cloth, which runs towards the second tow roller 10, gradually widen in a V shape in the horizontal direction. So it is called V-belt type dewatering equipment.

In a preferred embodiment, the first drawing roller 2 and the second drawing roller 10 are coated with a glue layer. The rubber layer is made of rubber. Specifically, the rubber is ethylene propylene diene monomer rubber.

In a preferred embodiment, the first and second drag rollers 2 and 10 are externally connected with chains, the chains are meshed with chain wheels, the chain wheels are externally connected with motors, and the motors are used for driving the chain wheels to rotate through the motors, and the first and second drag rollers are driven to rotate through the chains so as to drive the filter cloth to operate. The running speed of the filter cloth is 3-6 m/min.

In a preferred embodiment, as shown in fig. 1-2 and 4-5, a mud scraper 11 is arranged below the second dragging roller 10, and a cleaning box 14, a rectification roller 12 and a tension roller 13 are sequentially arranged on the filter cloth of the second dragging roller 10 running towards the first dragging roller 2.

The mud scraper 11 is used for scraping off the sludge which is formed into a mud cake on the filter cloth, and the mud cake is discharged through a mud outlet of the filter pressing dehydration unit. The mud scraper is made of PE or PP.

In a further embodiment, as shown in fig. 1 and 4, the cleaning box 14 is located below the filter cloth. The cleaning box 14 adopts a single-side nozzle cleaning mode, and the single flushing water quantity is 4m ³ H m, the flushing water pressure requirement is at least 0.6MPa. Used for cleaning residual sludge on the filter cloth.

In a further embodiment, the deviation rectification roller 12 is externally connected with a motor. The motor drives the deviation rectifying roller 12 to rectify the deviation of the filter belt.

The deviation correcting roller 12 is provided with a photoelectric sensing deviation correcting system. The photoelectric sensing deviation rectifying system is a conventionally used photoelectric sensing deviation rectifying system, can be purchased from the market and comprises a deviation rectifying proximity switch, a cylinder electromagnetic valve and a cylinder. The photoelectric sensing deviation rectifying system can provide a deviation rectifying signal to enable the deviation rectifying cylinder to act to adjust the walking direction of the filter cloth to rectify deviation when the filter cloth deviates. The pressure of a cylinder in the photoelectric induction deviation rectifying system is 0.25-0.4 MPa.

The deviation rectifying roller 12 is coated with a glue layer. The rubber layer is made of rubber. Specifically, the rubber is ethylene propylene diene monomer rubber.

In a further embodiment, the diameter of the rectification roller 12 is 63-102 mm.

In a further embodiment, the height of the tension roller 13 is adjustable. By adjusting the height of the tension roller 13, when the filter cloth is wrinkled or the filter cloth is extended for a long time, the filter cloth is flattened and then runs smoothly and stably. The tensioning roller 13 is a filter cloth tensioning mechanism, and the filter cloth is tensioned under the action of an air cylinder, wherein the pressure of the air cylinder is 0.3-0.5 MPa.

In a further embodiment, the diameter of the tension roller 13 is 158 to 182mm.

Example 1

In the V-belt type dewatering equipment with the self-adaptive sludge concentration, sludge from a sewage plant process flow is input into a first mixing pipe body 18 of a first mixing unit through a sludge inlet 17, the sludge and a flocculating agent input through a first flocculating agent inlet pipe 21 are mixed in the first mixing pipe body 18, and the sludge enters a second mixing pipe body 19 through a baffle plate 24 with a cone angle and a porous partition plate 23. In the second mixing pipe 19, the sludge is again mixed with the flocculant introduced from the second flocculant introduction pipe 22, and the sludge is sufficiently mixed and thoroughly coagulated by rotating and stirring the sludge by the stirring mechanism 25 via the stirring paddle driven by the motor. Then, the mixed materials are input into a second mixing unit 26 through a sludge discharge port 20 to be mixed, and the second mixing unit 26 is selected to be a pipeline mixing part or a mechanical mixing part according to the site requirement. In the second mixing unit 26, PAM and sludge are subjected to flocculation reaction to form sludge flocs with certain strength and granularity which can enter a dehydrator for squeezing and dewatering.

The mixed sludge is input into a filter-pressing dehydration unit. The sludge falls into the material distribution module 1 from the second mixing unit 26, the sludge is evenly spread on the filter cloth through the material distribution module 1, the sludge is firstly subjected to gravity dehydration in the area between the first dragging roller 2 and the material pressing section at the belt speed of 3-6 m/min, and the water enters the upper water collecting disc 15. And then the filter cloth is pulled by a first drag roller 2, the two sides of the filter cloth gradually narrow in the horizontal direction and are V-shaped, the filter cloth enters a material pressing section and passes through a pre-pressing module, a main pressing module and a final pressing module according to an S-shaped path, the filter cloth is pressed by a first pre-pressing roller 3, a second pre-pressing roller 4, a first main pressing roller 5, a second main pressing roller 6, a first final pressing roller 7, a second final pressing roller 8 and a third final pressing roller 9 in the pre-pressing module, water in sludge is pressed out, and water enters a lower water collecting disc 16. After squeezing and dewatering, the filter belt is pulled by the second drag roll 10 and moves towards the mud outlet, the filter cloth gradually and horizontally expands, the area is in a V-shaped structure until the filter cloth is completely flattened, and at the moment, the sludge becomes a mud cake. Sludge on the filter cloth is scraped off by the scraper 11 and is output through the crushing screw conveyor through the sludge outlet. The filter cloth is cleaned by a cleaning box 14 to remove residual sludge, the filter belt is adjusted by a tensioning roller 13, the filter belt is moved by a deviation rectifying roller 12 to perform a deviation rectifying effect, and finally the filter belt is pulled back to the material distribution module 1 by a first dragging roller 2 to start the material distribution and squeezing dehydration treatment in the next period. The water content of the mud cake after the dehydration of the general municipal sludge is less than or equal to 80 percent.

Example 2

The designed sewage treatment scale of a certain municipal sewage treatment plant is 5 ten thousand meters ³ And d, the sludge yield is about 40t/d (calculated by the water content of the sludge of 80%). The sludge is dehydrated and then dried. The V-shaped belt type dewatering equipment adopting the self-adaptive sludge concentration automatically adjusts the dosing amount according to the quality of sewage inlet water, and the generated sludge is different when the quality of the inlet water changes, so that the sludge is betterAnd (3) removing water in the sludge, and adding a coagulant according to the condition of the sludge to change the small-molecule suspended matters into large-molecule aggregates. The first mixing unit and the second mixing unit 26 are used for modifying the sludge of the sewage plant, so that the subsequent squeezing and dewatering are facilitated.

Two sets of V-shaped belt type dewatering equipment with the bandwidth of 0.75m and the self-adaptive sludge concentration are selected, when the V-shaped belt type dewatering equipment runs under 30Hz, the processing capacity of each set can reach 2.82t/h (calculated by the water content of 80%), the two sets of equipment run simultaneously, and the average daily working time is about 7.1h. And simple and easy hydroextractor area is littleer, and to small-size town sewage factory, the area of dehydration computer lab is less, uses above-mentioned device can reduce dehydration computer lab area. And after dehydration, the water content of the sludge can reach 78 percent, the sludge completely meets the requirement of subsequent treatment, and the sludge can be subjected to drying incineration or recycling treatment.

Example 3

The sewage treatment scale designed by a certain municipal sewage treatment plant is 4 ten thousand meters ³ And d, the sludge yield is about 32t/d (calculated by the water content of the sludge being 80%). The sludge of the plant needs to be transported outside after dehydration treatment, and the water plant occupies a small area due to limited scale. The V-shaped belt type dewatering equipment capable of adapting to the sludge concentration is adopted. The sewage plant mainly collects urban sewage, the total amount of the sewage changes slightly, and the water quality condition fluctuates in a small range. And because the whole scale of the water plant is smaller, the operation and maintenance can be reduced and the number of workers can be reduced after the V-shaped belt type dewatering equipment capable of adapting to the sludge concentration is adopted, the sludge feeding can be monitored, the medicament feeding is changed in real time, and the medicament input amount is reduced.

Two sets of V-shaped belt type dewatering equipment with the bandwidth of 0.5m and the self-adaptive sludge concentration are selected, the average treatment level is 1.88t/h, and the maximum treatment level can reach 2.4t/h. The working time is about 8.5h per day. The equipment has small occupied area, can effectively reduce the occupied area of small and medium-sized water plants, and solves the sludge dewatering problem of urban sewage. The water content of the sludge can be reduced to about 80 percent finally, the subsequent treatment or outward transportation standard of the sludge is met, the reduction treatment of the sludge can be realized, and the device has high integral automation level, less investment, low energy consumption and environmental friendliness, and is suitable for sludge dehydration treatment of small and medium-sized sewage plants.

In conclusion, the invention provides the V-shaped belt type dehydration equipment adaptive to the sludge concentration and the application thereof, the equipment energy consumption is low, the requirement on the site is low, the transfer is convenient, the subsequent treatment is convenient, and the V-shaped belt type dehydration equipment is particularly suitable for the dehydration treatment of sludge and solid waste generated by small-sized urban sewage plants. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The V-shaped belt type dewatering equipment capable of adapting to the sludge concentration is characterized in that a first mixing unit, a second mixing unit (26) and a filter-pressing dewatering unit are sequentially arranged along the sludge feeding direction, the first mixing unit is sequentially provided with a first mixing pipe body (18) and a second mixing pipe body (19) along the sludge feeding direction, the second mixing unit (26) is a pipeline mixing part or a mechanical mixing part, and the filter-pressing dewatering unit comprises a rack and a filter cloth running area arranged in the rack; the pipeline mixing part is a plurality of rows of parallel pipelines; the mechanical mixing part is a groove type reaction tank; the filter cloth running area is sequentially provided with a material distribution module (1), a first drag roller (2), a material pressing section and a second drag roller (10) along the sludge feeding direction, and the first drag roller (2) and the second drag roller (10) form a filter cloth running loop along the filter cloth running direction;

a first flocculating agent lead-in pipe (21) is arranged on the first mixing pipe body (18); a second flocculating agent lead-in pipe (22) is arranged on the second mixing pipe body (19);

a flow sensor and a concentration sensor are arranged on the first mixing pipe body 18, and the flow sensor and the concentration sensor are used for automatically adjusting the dosage of a flocculating agent PAM in real time by monitoring the concentration and the flow change of the sludge under the regulation and control of a programmable logic controller PLC, and keeping the dosage of the PAM to be 3-5 per mill of the absolute dry amount of the sludge;

a pre-pressing module, a main pressing module and a final pressing module are sequentially arranged in the pressing section along the filter cloth running direction, the pre-pressing module is sequentially provided with a first pre-pressing roller (3) and a second pre-pressing roller (4) along the filter cloth running direction, the main pressing module is sequentially provided with a first main pressing roller (5) and a second main pressing roller (6) along the filter cloth running direction, the final pressing module is sequentially provided with a first final pressing roller (7), a second final pressing roller (8) and a third final pressing roller (9) along the filter cloth running direction, and a lower water collecting disc (16) is arranged below the pressing section;

the two sides of the filter cloth, which run towards the material pressing section by the first drag roller 2, gradually narrow in the horizontal direction and are in a V shape, and the two sides of the filter cloth, which run towards the second drag roller 10 by the material pressing section, gradually widen in the horizontal direction and are in a V shape.

2. The V-belt type dewatering equipment of self-adaptive sludge concentration according to claim 1, characterized in that the inlet end of the first mixing pipe body (18) is provided with a sludge inlet (17); the outlet end of the second mixing pipe body (19) is provided with a sludge discharge port (20).

3. The V-shaped belt type dewatering equipment capable of adapting to the sludge concentration according to claim 1, wherein a baffle plate (24) is arranged in the first mixing pipe body (18), a porous partition plate (23) is arranged between the first mixing pipe body (18) and the second mixing pipe body (19), the baffle plate (24) is conical, and the bottom surface of the baffle plate (24) is connected with the partition plate (23).

4. The V-shaped belt type dewatering equipment capable of adapting to the sludge concentration in claim 1, wherein stirring mechanisms (25) are arranged in the second mixing pipe body (19), the pipeline mixing part and the mechanical mixing part; the stirring mechanism (25) is a frame type or blade type mechanical stirring device.

5. The V-belt dewatering plant according to claim 1, characterized in that an upper water collecting tray (15) is arranged below the area between the first dragging roll (2) and the pressing section.

6. The V-shaped belt type dewatering equipment with the self-adaptive sludge concentration according to claim 1, characterized in that a mud scraper (11) is arranged below the second drag roll (10), and a cleaning box (14), a rectification roll (12) and a tension roll (13) are sequentially arranged on the filter cloth of the second drag roll (10) moving towards the first drag roll (2).

7. A dewatering method of adaptive sludge concentration, characterized in that the V-shaped belt type dewatering equipment of the adaptive sludge concentration in any one of claims 1-6 is adopted, and the method comprises the following steps: