CN106976930B - Hydrocyclone separator for sludge water, and treatment system and method for synchronous dissolution of sludge water concentration/coagulant - Google Patents

Abstract

The present invention discloses a method and device for simultaneous concentration of sludge water and coagulant recovery in a waterworks. The present invention is centered on hydrocyclone solid-liquid separation and comprises a mud pump (3), a coagulant dissolution agent dosing system (I), a hydrocyclone system (II) and a centrifuge (8). After the sludge water from the waterworks pumped by the mud pump is mixed with the dissolution agent from the coagulant dissolution agent dosing system (I), the solid-liquid separation and coagulant dissolution process of the sludge water are simultaneously completed in the hydrocyclone system (II); the clear liquid rich in coagulant is discharged in the form of overflow clear liquid, the bottom flow concentrated sludge is discharged to a centrifugal dewatering machine (8) for dehydration, the generated mud cake is transported out for disposal, and the dehydrated filtrate is combined with the overflow clear liquid and sent to the raw water well of the waterworks for direct reuse. The present invention is a method and device for simultaneous solid-liquid separation and coagulant recovery of sludge water with a small footprint, good solid-liquid separation effect, high coagulant recovery efficiency and low drug consumption.

Description

Hydrocyclone for Slurry Water, and Slurry Concentrator/Coagulant Synchronization Dissolution processing system and method

technical field

The invention relates to the field of treatment of muddy water in a waterworks, in particular to a device for concentrating muddy water and synchronously dissolving a coagulant and an application method of the device.

Background technique

The amount of sludge produced by the water purification process in the water plant accounts for about 1.5% to 4% of the total purified water in the water plant, and the moisture content is about 99.7%; its main components include inorganic minerals (such as clay), coagulant hydrolyzates (such as Al(OH) ₃ , Fe(OH) ₃ ), and a small amount of impurities such as organic matter and microorganisms. The sludge water is directly discharged into the water body without treatment, which not only wastes precious water resources, but also pollutes the water body. For water plants that use aluminum salts as flocculants, the sludge water contains a large amount of aluminum salts, which will also cause certain toxic effects to aquatic organisms in the receiving water bodies. On the one hand, it can save a lot of water resources and greatly reduce the pollution to the receiving water body; on the other hand, it can also recover part of the coagulant in the muddy water, thereby effectively reducing the consumption of coagulant in the water plant. quantity.

At present, domestic and foreign technical solutions for the reuse and treatment of tap water and muddy water can be divided into two categories. One is the reuse treatment with solid-liquid separation as the main purpose based on the characteristics of high-concentration suspended solids in the muddy water; the other is for the coagulant hydrolysis product remaining in the muddy water, and the main purpose is to recover the coagulant. purpose of reuse. Among them, the core of the former is to improve the concentration efficiency of sludge drainage, and the available technical methods and equipment include traditional gravity concentration tank, granulation fluidized bed concentration technology, sludge concentration and dehydration integrated equipment, etc.; the key of the latter is For the dissolution or extraction of Al and Fe in the solid phase of the sludge water, the commonly used methods include acidification, alkalization, ion exchange, etc.

The main technical problem of solid-liquid separation of sludge-draining water is that the concentration efficiency of sludge-draining water is low, resulting in complicated process, large area and high construction and operation cost. Although the concentration efficiency can be improved by coagulation pretreatment, it increases the consumption of coagulant. Chinese invention patent (CN201210343711.X) discloses a high-efficiency concentrating device for muddy water. The device realizes the improvement of the concentration efficiency of muddy water through the technical scheme of adding PAM to the muddy water and setting up a separation tower, but it cannot realize the muddy water concentration. Recovery of coagulants.

The main technical problem of the recovery and treatment of coagulant in the sludge water is that it is still necessary to add a subsequent treatment and disposal process for the sludge water. After the coagulant recovery treatment, the clear liquid rich in Al and Fe can be mixed with the raw water of the water plant for reuse. Most of the remaining mud-water mixture still needs further solid-liquid separation to realize the proper treatment and disposal of the muddy water. In addition, when the coagulant is recovered by the acid-base method, since a large amount of acid or alkali is added, the pH needs to be adjusted before recycling.

In conclusion, so far, there has been no public report on the method and device for simultaneous solid-liquid separation and coagulant recovery of sludge and water in waterworks.

SUMMARY OF THE INVENTION

The first objective of the present invention is to provide a hydrocyclone separator for sludge drainage; it aims to realize the separation of solids such as sediment and water in sludge drainage, and the simultaneous dissolution of coagulant.

The second object of the present invention is to provide a system for concentrating sludge water and synchronously dissolving coagulant comprising the hydrocyclone separator.

The third object of the present invention is to provide an application method of the system, aiming to provide a small volume, small footprint, high concentration efficiency, and at the same time realize the coagulant dissolution and recovery of synchronous concentration and concentration of sludge from a tap water plant. Methods of coagulant recovery.

The utility model relates to a hydrocyclone separator for synchronous concentration of sludge drainage and recovery of coagulant, which is a container. The interior of the container includes a cylindrical cavity located at the upper part and a conical cavity located at the lower part, and the cylindrical cavity and the conical cavity. The top of the cylindrical cavity is provided with an overflow pipe, the side wall of the cylindrical cavity is provided with a feeding pipe; the bottom of the conical cavity is provided with an underflow pipe; The upper side wall is provided with an ultrasonic generator.

Preferably, the container shell comprises a top cover plate, an upper straight cylinder section, a lower straight cylinder section, a conical section and a bottom plate with an underflow tube which are sealed and connected sequentially from top to bottom; a top cover plate, an upper straight cylinder section, and a lower straight cylinder section The cylindrical cavity is enclosed; the conical section and the bottom plate with the underflow pipe are enclosed to form the conical cavity; the top cover plate is provided with an overflow pipe; The tangential direction of the outer wall of the upper straight tube section is arranged; the ultrasonic generator is arranged on the outer wall of the upper straight tube section.

In the present invention, the upper straight cylinder section is provided with an ultrasonic generator, which is helpful to realize the simultaneous auxiliary ultrasonic treatment of the material and liquid in the cyclone separation stage.

Preferably, the ultrasonic generators are arranged in two opposite sets; the ultrasonic generators are in the shape of a bearing pad, are connected by bolting, and are fixed on the outer wall of the upper straight cylinder section.

Preferably, the overflow pipe is arranged along the central axis of the hydrocyclone.

The overflow pipe is inserted into the chamber of the hydrocyclone through the top cover plate. That is, the input end of the overflow pipe is arranged inside the cylindrical cavity cavity, and the output end is arranged outside the cylindrical cavity cavity.

The input end of the overflow pipe is arranged in the chamber enclosed by the lower straight cylinder section.

The length of the overflow pipe inserted into the chamber of the hydrocyclone is equal to the height of the upper straight cylinder section and the lower straight cylinder section. That is, the input end of the overflow pipe is arranged near the bottom of the cavity of the lower straight cylinder section.

Preferably, the top cover plate, the upper straight cylinder section, the lower straight cylinder section, the conical section and the bottom plate are connected by flanges (sealing).

The hydrocyclone (5) is, from top to bottom, a top cover plate (10) with an overflow pipe (9), an upper straight cylinder section (11), a lower straight cylinder section (12), and a conical section (13). ) and a bottom plate (14) with an underflow tube (15), each part is connected by flanges; the area enclosed by the upper straight section (11) is the straight section coagulant dissolution reaction zone (A), the lower straight section (12 ) is the solid-liquid separation area of the straight cylinder section (B), and the area enclosed by the conical section is the solid-liquid separation area of the conical section (C).

Further preferably: the depth at which the overflow pipe (9) is inserted into the hydrocyclone (5) is the sum of the height of the straight cylinder section coagulant dissolution reaction zone (A) and the height of the straight cylinder section solid-liquid separation zone (B) .

Preferably, the cone angle of the cone segment is 8°.

The hydrocyclone separator of the present invention is preferably applied to the simultaneous concentration and coagulant recovery of the sludge drainage in the waterworks.

The invention also provides a system for concentrating sludge drainage and coagulant synchronous dissolution in a waterworks, including the hydrocyclone separator, mixer, mud pump, coagulant dissolution agent preparation barrel and centrifugal dehydrator; The outlet of the coagulant dissolution agent preparation barrel and the outlet of the mud pump are respectively or combined with the inlet of the mixer; the outlet of the mixer is connected with the feed pipe of the hydrocyclone; the The underflow pipe of the mixer is connected with the inlet of the centrifugal dehydrator; the liquid outlet and the overflow pipe of the centrifugal dehydrator are connected to the tap water reuse system separately or after being combined.

The system for concentrating sludge water from a tap water plant and synchronously dissolving a coagulant provided by the invention includes a coagulant dissolution agent dosing system and a hydrocyclone separation system. The core of the hydrocyclone separation system is the hydrocyclone separation system, which includes a hydrocyclone separator and a mixer connected to the feed pipe of the hydrocyclone separator; a coagulant dissolution reaction zone is added to the hydrocyclone separator; That is, the upper straight cylinder section provided with the ultrasonic generator; the underflow pipe (bottom outlet) of the hydrocyclone is connected to the centrifugal dehydrator. After the sludge discharge from the water plant is mixed with the dissolution agent from the coagulant dissolution agent dosing system, it enters the hydrocyclone separation system for simultaneous concentration and coagulant dissolution reaction, and the concentrated sludge is discharged into the centrifugal dehydrator for dehydration. The dissolved coagulant is directly recycled to the water plant with the overflow clear liquid.

Preferably, the coagulant dissolution medicament preparation barrel is connected to the inlet of the mixer through a coagulant dissolution medicament dosing pump.

The outlet of the coagulant dissolution medicament preparation barrel is connected with the input end of the coagulant dissolution medicament dosing pump, and the output end of the coagulant leaching medicament dosing pump is directly connected with the inlet of the mixer, or is connected to the inlet of the mixer. On the pipeline connecting the mud pump and the mixer inlet.

Preferably, the mixer is a tubular static mixer.

Preferably, the overflow pipe is provided with an overflow clear liquid discharge valve.

Preferably, the underflow pipe is provided with an underflow concentrated sludge discharge valve.

The present invention also provides a method for synchronously concentrating sludge drainage and coagulant dissolution recovery by utilizing the system, wherein the coagulant dissolution agent is dissolved in the preparation barrel; The mud and water are mixed, and then transferred to the hydrocyclone for cyclone separation, and ultrasonic-assisted coagulant dissolution is carried out simultaneously; the clear liquid rich in coagulant is continuously discharged from the overflow pipe; the underflow thickened sludge is discharged by the underflow The tube is transferred to a centrifugal dehydrator for solid-liquid separation; the solid part obtained from the solid-liquid separation is mud cake, and the liquid part and/or the overflowed clear liquid are reused.

Specifically, under the suction of the mud pump, the sludge drainage water from the water plant is fully mixed with the dissolution agent from the coagulant dissolution agent dosing system in the tubular static mixer; the mixed liquid enters the hydraulic power in the tangential direction. After the cyclone system, the coagulant dissolution process from the solid phase to the liquid phase is first realized in the coagulant dissolution reaction zone, with the aid of the coagulant dissolution agent and ultrasonic, and then the hydrocyclone solid-liquid separation is continued; The overflow clear liquid is rich in coagulant, and sent to the raw water well of the water plant to be directly mixed with the raw water to realize the recycling of sludge water and coagulant.

In the method of the present invention, under the action of the ultrasonic, the migration process of the coagulant from the solid phase to the liquid phase is promoted by the ultrasonic effect, and the dissolution rate of the coagulant is obviously improved.

Preferably, the coagulant dissolution agent is HCl or H ₂ SO ₄ .

Preferably, the pH of the solution in the mixer is controlled to be 3.0 to 4.0.

The frequency of the ultrasonic wave is not particularly required, but is, for example, 950 to 1050 kHz.

The method and device for synchronous concentration and coagulant recovery of sludge drainage in a waterworks using the above-mentioned technical scheme, its mechanism is briefly described as follows:

The muddy water sucked by the mud pump is firstly mixed with the coagulant dissolution agent quickly and uniformly in the tubular static mixer. The mixed liquid enters the coagulant dissolution reaction zone of the straight pipe section from the tangential inlet, and the mixed liquid in the reaction zone rotates at a high speed and moves downward in a spiral shape; the coagulant in the solid phase of the mixed liquid in the reaction zone is Under the action of the dissolution agent, it migrates from the solid phase to the liquid phase. During the spiral downward movement of the mixed liquid, under the action of centrifugal force, the solid phase sludge particles will overcome the resistance and gradually separate from the liquid, and the sludge particles collide violently with each other. Fragmentation, friction and extrusion between each other, and the above-mentioned collision, crushing, friction and extrusion effects promote the migration of the coagulant from the solid phase to the liquid phase. After the mixed liquid runs down to the solid-liquid separation zone of the straight cylinder section, due to the spiral motion of the liquid, the vicinity of the axis of the hydrocyclone becomes a low-pressure zone, and the pressure near the wall is the highest, and the coagulant continues to dissolve from the solid phase to the liquid phase. Sludge particles and liquid are also further separated. The mixed liquid continues to descend to the solid-liquid separation area of the conical section. Most of the sludge particles will overcome the resistance and move to the side wall of the hydrocyclone, separated from the liquid, and finally discharged from the underflow pipe to form underflow concentrated sludge, which is sent to the centrifugal The dehydrator is dehydrated; the water and fine particles rich in coagulant move to the low pressure area, and make a spiral motion upward while rotating, forming an internal swirling flow, which is finally discharged from the overflow pipe in the form of overflow clear liquid. After the dehydration filtrate of the centrifugal dehydrator is combined with the overflow clear liquid, it is sent to the raw water well of the waterworks for reuse.

Advantages and beneficial effects of the invention

The advantages and beneficial effects that the present invention has:

1. Simultaneously realize the solid-liquid separation and coagulant recovery of the muddy water. On the basis of the traditional hydrocyclone, the present invention forms a coagulant dissolution zone and a solid-liquid separation zone in the straight cylinder section by appropriately extending the length of the straight cylinder section. Synchronization in the device.

2. Good solid-liquid separation effect, no need to add coagulant. The concentration and separation of the muddy water is mainly realized by the centrifugal force generated by the high-speed rotation of the muddy water in the hydrocyclone, and the solid-liquid separation effect is good.

3. The dissolution efficiency of the coagulant is high. In the coagulant dissolution zone of the straight cylinder section, due to high-speed rotation and ultrasonic vibration, the solid particles of the muddy water will be broken, collided, rubbed, and squeezed, which promotes the migration process of the coagulant from the solid phase to the liquid phase. The dissolution efficiency of the coagulant is high.

4. The consumption of coagulant dissolution agent is small. The high-speed rotation and ultrasonic vibration of the muddy water in the hydrocyclone separation system improve the dissolution efficiency of the coagulant, and the dosage of the corresponding coagulant dissolution agent can be greatly reduced.

5. Small footprint, easy to realize automatic control. Due to the good solid-liquid separation effect, high coagulant dissolution efficiency, and high processing load per unit area, the sludge drainage water treatment device proposed by the present invention has a significant advantage of small footprint; the sludge drainage water concentration and coagulant recovery process are The hydrocyclone is synchronously completed, the equipment process is compact, the degree of integration is high, and it is easy to realize automatic control.

To sum up, the present invention is a tap water plant drained water with small footprint, high integration degree, good solid-liquid separation effect, high coagulant dissolution efficiency, and simultaneous realization of sludge drainage concentration and coagulant recovery. A method of treatment and an apparatus therefor.

Description of drawings

FIG. 1 is a schematic flow chart of the method for synchronous solid-liquid separation and coagulant recovery of sludge drainage from a water plant according to the present invention.

Figure 2 is a schematic structural diagram of a hydrocyclone in the present invention.

Fig. 3 is the installation schematic diagram of the ultrasonic generator in the present invention

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Detailed ways

Referring to Fig. 1, Fig. 2 and Fig. 3, the system for realizing synchronous solid-liquid separation and coagulant recovery of sludge and water discharge from a waterworks provided by the present invention includes a mud pump (3), a coagulant dissolution agent mixing and dosing system (1) , Hydrocyclone separation system (II) and centrifugal dehydrator (8). The coagulant dissolution agent mixing and dosing system (1) is composed of a coagulant dissolution agent preparation barrel (1) and a coagulant dissolution agent addition pump (2); wherein, the coagulant dissolution agent preparation barrel (1) is composed of The outlet is connected with the input end of the coagulant dissolution agent dosing pump (2).

The hydrocyclone separation system (II) includes a tubular static mixer (4), a hydrocyclone separator (5), an overflow clear liquid discharge valve (6) and an underflow thickened sludge discharge valve (7). The outlet of the mud pump (3) is connected with the inlet of the tubular static mixer (4) by a pipeline; the output end and the injection point of the coagulant dissolution agent dosing pump (2) are located at the inlet of the tubular static mixer (4) Before (the output end of the coagulant dissolution agent dosing pump (2) is connected with the pipeline of the mud pump (3) and the tubular static mixer (4) through the connecting pipeline).

The main body of the hydrocyclone (5) is, from top to bottom, a top cover plate (10) with an overflow pipe (9), an upper straight cylinder section (11), a lower straight cylinder section (12), and a conical section (10). 13) and a bottom plate (14) with an underflow pipe (15), and each part is connected by flanges; the area enclosed by the upper straight section (11) is the straight section coagulant dissolution reaction zone (A), and the lower straight section ( 12) The enclosed area is the solid-liquid separation area of the straight cylinder section (B), and the area enclosed by the conical section is the solid-liquid separation area of the conical section (C). The water inlet pipe (17) of the hydrocyclone (5) is connected with the upper straight cylinder section (11) along the tangential direction. Overflow pipe (9), top cover plate (10), upper straight cylinder section (11), lower straight cylinder section (12), conical section (13), bottom flow pipe (15), bottom plate (14) and water inlet pipe (17) The specifications of different specifications are selected according to the processing scale and the nature of the muddy water discharged from the water plant.

The outer wall of the upper straight cylinder section (11) is provided with an ultrasonic generator (16), and the ultrasonic generator (16) is formed by two symmetrical bearing-shaped ultrasonic generators connected by bolting, and is fixed on the upper straight cylinder section (11). outer wall.

The outlet of the tubular static mixer (4) is connected to the inlet of the hydrocyclone (5). The overflow pipe (9) of the hydrocyclone (5) is provided with an overflow clear liquid discharge valve (6), and the underflow pipe (15) at the bottom of the hydrocyclone (5) is provided with an underflow concentrated sludge discharge valve (7); The diversion ratio of the hydrocyclone (5) is controlled by the overflow clear liquid discharge valve (6) and the underflow thickened sludge discharge valve (7). The outlet of the underflow thickened sludge discharge valve (7) is connected to the centrifugal dewatering machine (8), and the underflow thickened sludge enters the centrifugal dewatering machine (8) for dehydration, the de-cemented cake is transported for disposal, and the dewatered filtrate and the clear liquid from the overflow are discharged. The coagulant-rich overflow clear liquid discharged from the valve (6) is mixed and sent to the raw water well of the waterworks for reuse.

The method for synchronizing solid-liquid separation and coagulant recovery of muddy water from a tap water plant provided by the present invention takes a hydrocyclone separation system as the core, the centrifugal dehydrator is directly connected with the hydrocyclone separation system, and the muddy water from the tap water plant is pumped by a mud pump. After mixing with the coagulant dissolution agent from the coagulant solvent agent mixing and dosing system, it enters the hydrocyclone separation system for simultaneous sludge drainage and coagulant dissolution, and the obtained overflow clear liquid rich in coagulant is directly It is sent to the raw water well of the waterworks for reuse, and the underflow thickened sludge is discharged into the centrifugal dehydrator for dehydration.

Specifically, the mud pump (3) is used to pump the muddy water from the waterworks, and after the muddy water is mixed with the coagulant dissolution agent from the coagulant dissolution agent mixing and dosing system (I), it enters the hydrocyclone separation system (II) Simultaneous solid-liquid separation and coagulant dissolution are carried out, and the obtained overflow clear liquid rich in coagulant is reused to the raw water well of the water plant; the underflow thickened sludge enters the centrifugal dehydrator (8) for dehydration, and the dewatered filtrate and overflow The supernatant liquid is combined and reused, and the de-cemented cake is shipped out for disposal.

The coagulant dissolution agent adopts HCl or H ₂ SO ₄ .

The invention takes the hydraulic cyclone separation system as the core, and by appropriately extending the length of the straight cylinder section, the straight cylinder section coagulant dissolution zone and the straight cylinder section solid-liquid separation zone are formed. Synchronization in the device. In the present invention, the solid-liquid separation is realized by the centrifugal force generated by the high-speed rotation of the muddy water in the hydrocyclone, the solid-liquid separation effect is good, and no coagulant needs to be added; The crushing, mutual collision, friction, extrusion and other effects caused by ultrasonic vibration greatly improve the dissolution efficiency of coagulant, and the consumption of coagulant dissolution agent is small; the equipment has high processing load, small footprint, compact and integrated process high degree of chemistry. In a word, the invention has the advantages of small footprint, good solid-liquid separation effect, high coagulant recovery efficiency, low chemical consumption, and simultaneous realization of sludge drainage concentration and coagulant recovery.

The sludge water is treated by the above system.

Example 1

This embodiment takes the sludge drainage of a water plant in a city in southern China as the treatment object, and builds a small device for simultaneous solid-liquid separation and coagulant recovery of sludge drainage in a reserved site for sludge drainage, with a treatment scale of 1 m ³ /h. The lift of the mud pump is 30m. The moisture content of the muddy water is between 99.0% and 99.7%.

Referring to Figure 1 and Figure 2, the muddy water is sucked by the mud pump (3), and sent to the tubular static mixer (4) together with the coagulant dissolution agent from the coagulant dissolution agent mixing and dosing system (1). After mixing, it is sent to a hydrocyclone (5) for simultaneous solid-liquid separation and coagulant dissolution. The diameter of the coagulant dissolution reaction zone (A) of the straight section of the hydrocyclone is 200mm and the height is 200mm; the diameter of the solid-liquid separation section of the straight section (B) is 200mm and the height of 100mm; the diameter of the top of the solid-liquid separation section of the conical section (C) is 200mm, Bottom diameter 50mm, taper angle 8°. The coagulant dissolution agent adopts H ₂ SO ₄ , and the dosage is to control the pH value of the sludge-water mixture to be about 3.5. The sludge-draining water mixture enters the coagulant dissolution reaction zone (A) of the straight-tube section along the tangential direction of the hydrocyclone (5), where the dissolution of H ₂ SO ₄ occurs, as well as the high-speed rotation of the sludge-draining water solid particles and ultrasonic vibration (power is 1000W). ), the coagulant in the solid phase of the sludge-draining water migrates to the liquid phase; the sludge-draining water continues to spiral downward and enters the solid-liquid separation zone (B) and The solid-liquid separation zone (C) of the conical section completes the solid-liquid separation process under the action of centrifugal force. The recovery rate of the coagulant in the muddy water is 40-50%. The clear liquid rich in the coagulant moves to the low pressure area in the center of the hydrocyclone, and makes a spiral upward movement in the form of an inner swirl, and finally overflows in the form of clear liquid. It is discharged from the overflow pipe (9); the underflow concentrated sludge has a moisture content of about 90-94%, and is sent to the centrifugal dehydrator (8) through the underflow pipe (15) for dehydration. After disposal, the dewatered filtrate produced is mixed with the overflow clear liquid and sent to the raw water well of the waterworks for reuse.

Of course, the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the specific embodiments of the present invention can still be explained. Any modification or equivalent replacement without departing from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims (7)

1. a system for concentrating muddy water and coagulant synchronous dissolution in a waterworks, is characterized in that: comprise hydrocyclone, mixer, mud pump, coagulant dissolution medicament preparation barrel and centrifugal dehydrator; The hydrocyclone separator is a container, and the interior of the container includes a cylindrical cavity located at the upper part and a conical cavity located at the lower part, and the cylindrical cavity and the conical cavity are communicated with each other; The container shell includes a top cover plate, an upper straight tube section, a lower straight tube section, a conical section and a bottom plate with an underflow tube which are sealed and connected in sequence from top to bottom; a cavity; the conical section and the bottom plate with an underflow tube enclose the conical cavity; The top cover plate is provided with an overflow pipe; the overflow pipe is inserted into the chamber of the hydrocyclone through the top cover plate, and the input end of the overflow pipe is arranged in the area enclosed by the lower straight cylinder section. inside the chamber; The side wall of the cylindrical cavity is provided with a feeding pipe, and the feeding pipe is arranged along the tangential direction of the outer wall of the upper straight cylinder section; The upper straight section of the cylindrical cavity is provided with an ultrasonic generator, and the ultrasonic generator is arranged on the outer wall of the upper straight section; The outlet of the coagulant dissolution medicament preparation barrel and the outlet of the mud pump are respectively or combined with the inlet of the mixer; the outlet of the mixer is connected with the feed pipe of the hydrocyclone; The underflow pipe of the mixer is connected with the inlet of the centrifugal dehydrator; the liquid outlet and the overflow pipe of the centrifugal dehydrator are connected to the tap water reuse system separately or after being combined. 2. The system for concentrating muddy water in water works and synchronous dissolving of coagulant as claimed in claim 1, it is characterized in that: described ultrasonic generators are 2 sets of oppositely arranged; It is connected by bolting and fixed on the outer wall of the upper straight cylinder section. 3 . The system for concentrating sludge water from a water plant and synchronously dissolving coagulants as claimed in claim 1 , wherein the cone angle of the conical section is 8°. 4 . 4. The system for concentrating muddy water in a water plant and synchronously dissolving coagulant as claimed in claim 1, wherein the coagulant dissolution agent preparation barrel is connected with the coagulant dissolution agent dosing pump by the Inlet connection to the mixer. 5 . The system for concentrating sludge water from a water plant and synchronously dissolving coagulants according to claim 1 , wherein the mixer is a tubular static mixer. 6 . 6. The system for concentrating sludge drainage and coagulant synchronous dissolving in water works as claimed in claim 1, wherein: the overflow pipe is provided with an overflow clear liquid discharge valve; the underflow pipe is provided with There is an underflow thickened sludge discharge valve. 7. a method utilizing the system described in any one of claims 1 to 6 to synchronously separate the solid-liquid and coagulant of sludge drainage from a waterworks, it is characterized in that: the described coagulant dissolution agent is prepared Dissolved in the barrel; mixed with the muddy water from the water plant in the mixer, and then transferred to the hydrocyclone separator for cyclone separation, and ultrasonic-assisted coagulant dissolution was carried out simultaneously; the clear liquid rich in coagulant was The overflow pipe is continuously discharged; the underflow thickened sludge is transferred from the underflow pipe to the centrifugal dehydrator for solid-liquid separation; the solid part obtained by the solid-liquid separation is mud cake, and the liquid part and/or the overflow clear liquid is reused; The coagulant dissolution agent is an acid solution; the pH of the solution in the control mixer is 3.0~4.0.

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