CN215288245U - Sewage desanding system - Google Patents

Abstract

The utility model relates to a sewage desanding system, which comprises a lifting pump for lifting sewage and a cyclone desander, wherein the water inlet of the cyclone desander is communicated with the lifting pump through a pipeline, and the bottom of the cyclone desander is provided with a sand discharge port for outputting a sand-water mixture; the inlet of the sand-water separator is communicated with the sand discharge port and is used for separating sand and water in the sand-water mixture through precipitation; the sewage desanding system can effectively remove sand grains with a size of more than 200 mu m in sewage, and can remarkably improve the removal efficiency and removal effect of fine sand grains with a size of less than 200 mu m, thereby effectively solving the defects in the prior art.

Description

Sewage desanding system

Technical Field

The utility model relates to a sewage treatment technical field, concretely relates to sewage degritting system.

Background

The sewage pretreatment desanding is one of the links which cannot be lost in a sewage treatment plant, and the quality of the desanding effect directly relates to the treatment effect and the operation and maintenance workload of a subsequent treatment unit; the traditional sand removing system mainly comprises an advection grit chamber, an aeration grit chamber and a rotational flow grit chamber, wherein the advection grit chamber has no sand washing function due to large occupied area, has undesirable sand removing effect and is used less at present; the aeration grit chamber occupies a smaller area than a horizontal flow grit chamber, and because of the aeration function, the sand grains can rub against each other and bear the shearing force of aeration in the treatment process, so that organic pollutants attached to the sand grains can be removed; the floor area of the cyclone grit chamber is the smallest of the three, and the cyclone grit chamber has the characteristics of convenience in installation, low energy consumption, simplicity in maintenance and the like, but the sand washing function is weaker than that of the aeration sedimentation tank, an independent sand washing device is usually required to be additionally arranged, and the sand removing effect is poorer than that of the aeration sedimentation tank; in addition, the sand discharge modes of the three sand removing systems are pumping or gas stripping, so that the devices such as a pump and the like are seriously abraded after long-term use.

From the actual treatment effect, the three traditional sand removing systems only have certain removal effect on sand grains with the grain size larger than 200 mu m, the removal effect on sand grains with the grain size of about 200 mu m is poor, and the removal efficiency is only about 60%; in addition, due to the relation between the drainage system and the soil characteristics in China, the sand grains with the grain size larger than 200 microns which are actually entered by most sewage plants are very small in proportion, and the sand grains with the grain size smaller than 200 microns which are entered by individual sewage plants are even more than 80 percent in proportion, so that the traditional sand removal system hardly has the removal effect on the fine sand; and the fine sand with smaller particle size is easy to suspend in the sludge mixed liquid, on one hand, the MLVSS/MLSS ratio of the activated sludge is reduced, the microorganism quantity of the activated sludge in unit volume is reduced, the activity of the sludge is influenced, on the other hand, the sand grains are easy to cause pool bottom sedimentation, and great difficulty is brought to subsequent operation and maintenance, and the solution is needed urgently.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first aspect will be solved traditional desanding system and is less than good enough to the effect of getting rid of 200 mu m's sand grain to the particle size, to the problem that the effect was hardly got rid of to the following fine sand grain of 200 mu m, a sewage desanding system is provided, this sewage desanding system not only can effectively get rid of the sand grain more than 200 mu m in the sewage, can show the effect of getting rid of and get rid of efficiency that improves the following fine sand grain of 200 mu m in addition, the main design is:

a sewage desanding system comprises a lifting pump for lifting sewage,

the water inlet of the cyclone desander is communicated with the lifting pump through a pipeline, and the bottom of the cyclone desander is provided with a sand discharge port for outputting a sand-water mixture;

and the inlet of the sand-water separator is communicated with the sand discharge port and is used for separating sand and water in the sand-water mixture through precipitation. In the system, by constructing the lifting pump, on one hand, the conveying power can be provided for the sewage, the problem of conveying the sewage into the cyclone desander is solved, on the other hand, the sewage can enter the cyclone desander at a certain pressure and speed, and the separation effect of the cyclone desander is more favorably improved; by constructing the cyclone desander, sand grains can be primarily separated from the sewage by utilizing the action of centrifugal force, so that a sand-water mixture containing water and the sand grains is discharged through a sand discharge port of the cyclone desander, and the residual sewage is discharged through a water outlet of the cyclone desander so as to be convenient for subsequent treatment; by arranging the sand-water separator, water and sand grains in the sand-water mixture can be further separated in a precipitation mode, particularly fine sand grains can be separated, and therefore sand grains with low water content can be obtained for outward transportation; the system not only can effectively remove sand grains more than 200 mu m in sewage in the actual operation process through the matching of the lifting pump, the cyclone desander and the sand-water separator, but also can obviously improve the removal efficiency of fine sand grains less than 200 mu m, thereby effectively improving the removal effect of the fine sand grains in the sewage.

In order to reduce the cost, the height of a sand discharge port in the cyclone desander is higher than that of an inlet in the sand-water separator. There is the difference in height between sand discharge port and the entry promptly for the sand-water mixture of following sand discharge port exhaust can be under the effect of internal pressure and self gravity flow into the sand-water separator automatically, need not to set up extra power, and both the structure is simplified to existing the being favorable to, again can reduce cost.

In order to separate sand and water in the sand-water mixture by using the principle of sedimentation, further, the sand-water separator comprises a sedimentation part and a conveying part for providing a sedimentation space, wherein,

the settling section comprises a housing configured with an internal settling chamber, a water outlet section, and the inlet, the inlet and the water outlet section being in communication with the internal settling chamber, respectively;

the conveying part is communicated with the inner sedimentation cavity and is used for conveying sand grains sedimented in the inner sedimentation cavity out. In this scheme, inside precipitation chamber can provide the place for the sediment of the sand grain in the sand water mixture for sand grain in the sand water mixture can deposit in the bottom of inside precipitation chamber, and the conveying part can be carried away the sand grain that inside precipitation intracavity was depositd, thereby realizes sand water separation.

Preferably, the conveying part comprises a spiral conveying device, the spiral conveying device comprises a conveying groove and a spiral conveying mechanism arranged in the conveying groove, the conveying groove is obliquely arranged, the lower end of the shell is connected to the conveying groove, the inner settling cavity is communicated with the conveying groove, and the spiral conveying mechanism is used for driving the settled sand grains to be conveyed along the conveying groove and discharged from a discharge hole formed in the conveying groove. In this scheme, deposit in the sand grain of inside precipitation chamber bottom can pass through screw conveyor, along the inside precipitation chamber of conveyer trough discharge, and the supernatant of inside precipitation intracavity can be via the inside precipitation chamber of play water outlet portion discharge to realize sand water separation.

In order to solve the problem of inclined installation of the conveying trough, the conveying trough further comprises a rack, and the shell and/or the conveying trough are fixedly installed on the rack and are in an inclined state. Through installing the conveyer trough slope, both can practice thrift the place, can play the effect of waterlogging caused by excessive rainfall again, be favorable to obtaining the sand grain that the water content is lower, the subsequent processing of the sand grain of being more convenient for.

Preferably, the spiral conveying mechanism comprises a motor and a spiral blade which is matched with the conveying groove and can be rotatably arranged in the conveying groove, and the motor is in transmission connection with the spiral blade and is used for driving the spiral blade. So that the rotation of the spiral blade is used for lifting and separating sand grains.

In order to solve the storage problem of the sewage, the sand-water separator further comprises a first container for containing the sewage, a water outlet part of the sand-water separator is communicated with the first container, and the lifting pump is communicated with the first container. The first container can temporarily store sewage to be treated and can contain water separated from the sand-water separator, so that the problem of water discharge of the sand-water separator is solved.

Preferably, the first container is a pool, tank or ditch.

Preferably, the lift pump is installed in the first container.

To solve the problem of continuous operation of the system, the water outlet part further comprises an overflow port formed in the shell. The overflow port is formed in the shell of the sand-water separator, so that the sand removing system can continuously operate in an overflow mode.

Preferably, the overflow port is arranged at a height which is consistent with or higher than the height of the inlet. The space utilization rate of the inner sedimentation cavity can be improved, and the continuous operation of the equipment can be realized in an overflow mode.

Preferably, the overflow port is in communication with the first container. So that the water flowing out of the overflow can be returned to the first container for the purpose of sand removal again.

The second aspect of the utility model is to solve the problem of improving the efficiency of removing fine sand particles below 200 μm, and further, a first valve for controlling on/off is arranged on the communication path between the cyclone sand remover and the sand-water separator;

the water outlet part comprises a water outlet configured on the shell, and the water outlet is configured below the inlet and used for discharging supernatant liquid in the inner sedimentation cavity;

the water outlet device also comprises a second valve which is used for controlling the on/off of the water outlet. In the scheme, a first valve is arranged at the upstream of the internal settling cavity and is used for controlling whether the sand-water mixture enters the internal settling cavity or not; controlling yes/no discharge of the supernatant in the inner settling chamber through the drain port by providing a second valve downstream of the inner settling chamber; through the cooperation of first valve and second valve for the sand-water separator in this system can adopt the operation mode work of batch formula, can greatly reduced the disturbance of water body flow or fluctuation to the sediment sand grain in inside sedimentation chamber, in this kind of environment, very be favorable to the effective settlement and the promotion separation of the fine sand below 200 mu m, not only can show and improve sand removal efficiency, can show and improve the fine sand grain removal efficiency below 200 mu m moreover.

In order to facilitate separate discharge of the supernatant in the inner settling chamber, it is preferable that the drain port is constructed at a position corresponding to a lower portion of the inner settling chamber.

Preferably, the drain port is in communication with the first container. So that water flowing out of the drain opening can be returned to the first container for the purpose of sand removal again.

Preferably, the first valve is a manual valve, an electric valve, a pneumatic valve or an electromagnetic valve. So as to manually control or automatically control the on/off state of the inlet.

Preferably, the second valve is a manual valve, an electric valve, a pneumatic valve or an electromagnetic valve. So as to manually control or automatically control the on/off state of the drain opening.

For solving the problem of cyclone desander and sequencing batch type sand-water separator cooperation operation, further, still including the second container that is used for saving sand-water mixture, the second container is linked together with cyclone desander's sand discharge mouth, and cyclone desander pass through the pipeline with sand-water separator's entry is linked together, first valve sets up in this pipeline. In the scheme, the second container is mainly used for temporarily storing the sand-water mixture discharged from the sand discharge port, so that in the actual operation process, the lifting pump and the cyclone desander which are arranged at the upstream of the second container can continuously operate, and the first valve, the spiral conveying mechanism and the second valve which are arranged at the downstream of the second container can work in a sequencing batch operation mode, so that the whole system can realize sand-water separation in a sequencing batch mode, and the removal efficiency of fine sand grains below 200 mu m can be obviously improved.

Preferably, the second container is installed below the sand discharge port, and the height of the second container is higher than that of the inlet in the sand-water separator. Make the sand water mixture that breaks away from sand discharge opening can fall into in the second container of below under the effect of internal pressure and gravity, and the sand water mixture in the second container also can flow into the sand water separator automatically under the effect of excess pressure and gravity equally, need not to set up extra power, not only is favorable to simplifying the structure, can reduce cost again.

Preferably, the second container is a sand cylinder, a box body or a tank body.

In order to solve the problem of preventing the blockage of the cyclone desander, the cyclone desander further comprises a grating device for intercepting sundries, wherein the grating device is arranged at the upstream of the lifting pump, and sewage is conveyed into the cyclone desander by the lifting pump after passing through the grating device. Through setting up the grid device, can effectively intercept great debris in the sewage, avoid debris to get into the whirl desander to can effectively solve the jam problem of whirl desander.

Compared with the prior art, use the utility model provides a pair of sewage degritting system not only can effectively remove the sand grain more than 200 mu m in the sewage, can show the effect of getting rid of and get rid of efficiency that improves the fine sand grain below 200 mu m moreover, can effectively solve the not enough that prior art exists.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a cyclone desander in a sewage desanding system provided in embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of a sand-water separator in a sewage desanding system provided in embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of a sewage desanding system provided in embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of a sand-water separator in a sewage desanding system provided in embodiment 2 of the present invention.

Fig. 5 is a schematic structural view of a sewage desanding system provided in embodiment 2 of the present invention.

Fig. 6 is a schematic structural diagram of another sewage desanding system provided in embodiment 2 of the present invention.

Fig. 7 is a schematic partial structural view of another sewage desanding system provided in embodiment 2 of the present invention.

Description of the drawings

A first vessel 100, a grid arrangement 101, an upstream zone 102, a downstream zone 103

Lift pump 200, pipeline 201

Cyclone desander 300, water inlet 301, sand discharge port 302, water outlet 303 and bracket 304

Second container 400

A sand-water separator 500, a settling part 501, a casing 502, an inlet 503, an overflow port 504, a water outlet 505, a conveying part 507, a conveying groove 508, a discharge port 509, a frame 510 and a motor 511

Sinking foundation pit 600, drainage channel 601 and drainage pipe 602

A first valve 701 and a second valve 702.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1-3, the present embodiment provides a sewage desanding system, which includes a lift pump 200, a cyclone desander 300, and a sand-water separator 500, wherein,

the lift pump 200 may be a pump commonly used in the prior art, as shown in fig. 3, the lift pump 200 may provide a conveying power for the sewage so as to convey the sewage into the cyclone desander 300, and may allow the sewage to enter the cyclone desander 300 at a certain pressure and speed, so as to achieve a better separation effect by using a centrifugal force in the cyclone desander 300.

In this embodiment, the cyclone desander 300 may be a cyclone desander 300 commonly used in the prior art, as shown in fig. 1 and 3, a cyclone chamber is configured in the cyclone desander 300, and the lower end of the cyclone chamber is generally configured in a conical shape so as to form a cyclone; a water inlet 301 is generally formed in the side surface of the upper end of the cyclone desander 300, as shown in fig. 1, so that sewage can enter the cyclone cavity along the tangential direction of the cyclone cavity, and a water outlet 303 is formed in the center of the upper end of the cyclone desander 300, as shown in fig. 1; the lower end of the cyclone desander 300 is provided with a sand discharge port 302; in this embodiment, the water inlet 301 of the cyclone desander 300 can be communicated with the lift pump 200 through a pipe 201; in actual operation, under the action of residual pressure of the lifting pump 200, sand-containing sewage enters the cyclone cavity tangentially through the water inlet 301 at a certain pressure, forms an outer cyclone from top to bottom under the action of the cyclone cavity, forms an inner cyclone from bottom to top under the action of the contraction flow limiting of the bottom cone, and effectively separates sand grains doped with light organic matters under the simultaneous action of the inner cyclone and the outer cyclone, wherein the sand grains have a higher specific gravity and a thicker grain diameter relative to the organic matters, move downwards along with the outer cyclone and are discharged out of the cyclone sand remover 300 through the sand discharge port 302; the light organic matters move upwards along with the inner rotational flow and are discharged out of the rotational flow desander 300 from the water outlet 303 so as to be convenient for subsequent advanced treatment; in the process, the sewage containing sand grains enters the cyclone sand remover 300, after passing through the cyclone sand remover 300, part of water in the sewage is discharged through the water outlet 303, and the sewage containing a large amount of sand grains passes through the sand discharge port 302, which is equivalent to that the sewage is a concentrated sand-water mixture (namely the sand grains in the sewage have higher concentration) discharged from the sand discharge port 302, so that the purpose of primary separation is achieved, and the sand water is further separated in the following process.

In this embodiment, the sand-water separator 500 may be a sand-water separator 500 commonly used in the prior art, for example, as shown in fig. 2 and 3, the sand-water separator 500 includes a settling part 501 for providing a settling space, a conveying part 507 and a rack 510, wherein the settling part 501 includes a housing 502, the housing 502 is configured with an internal settling cavity, a water outlet part and the inlet 503, and the inlet 503 and the water outlet part are respectively communicated with the internal settling cavity; in this embodiment, the inner settling chamber may provide a place for settling sand grains in the sand-water mixture, so that the sand grains in the sand-water mixture may settle at the bottom of the inner settling chamber, and the shape of the inner settling chamber may be determined according to actual requirements, which is not illustrated here; in the embodiment, the water outlet part is used for discharging the supernatant in the inner sedimentation cavity; as shown in fig. 2, the conveying part 507 is communicated with the inner settling chamber, and is used for conveying out the sand grains settled in the inner settling chamber; in the present embodiment, the inlet 503 of the sand-water separator 500 is communicated with the sand outlet 302, for example, the inlet 503 and the sand outlet 302 can be communicated through the pipe 201, so that the sand-water separator 500 can separate sand and water in the sand-water mixture by means of sedimentation, particularly can separate fine sand grains, and can obtain sand grains with low water content for transportation;

in this embodiment, the conveying part 507 has various embodiments, as an example, as shown in fig. 2, the conveying part 507 includes a screw conveyer, the screw conveyer includes a conveying groove 508 and a screw conveyer, the conveying groove 508 is installed obliquely, as shown in fig. 2 and 3, the lower end of the housing 502 is connected to the conveying groove 508, the inner settling chamber is communicated with the conveying groove 508, and the screw conveyer is disposed right at the conveying groove 508, the screw conveyer is mainly used for driving the sand settled in the inner settling chamber to be conveyed along the conveying groove 508 and discharged from a discharge port 509 configured at the conveying groove 508, as shown in fig. 2 and 3, the discharge port 509 is preferably disposed at a position far away from the housing 502 so as to smoothly discharge the sand.

In this embodiment, the housing 502 and/or the conveying trough 508 are fixedly mounted on the frame 510, and the conveying trough 508 is in an inclined state, as shown in fig. 2 and 3, by mounting the conveying trough 508 in an inclined state, not only can the field be saved, but also the effect of draining can be achieved, which is beneficial for obtaining sand with lower water content, and is more convenient for the subsequent treatment of the sand.

In a more perfect scheme, the spiral conveying mechanism comprises a motor 511 and a spiral blade which is matched with the conveying groove 508 and is rotatably arranged in the conveying groove 508, as shown in fig. 2 and fig. 3, the motor 511 is in transmission connection with the spiral blade and is used for driving the spiral blade; for example, the middle of the spiral blade may not be provided with a rotating shaft, and when the rotating shaft is provided, the rotating shaft may be mounted on the conveying trough 508 through a bearing and is in transmission connection with an output shaft of the motor 511, so that the spiral blade is driven to rotate by the motor 511, and the rotation of the spiral blade can be used for lifting and separating sand grains.

In this scheme, inside precipitation chamber can provide the place for the sediment of the sand grain in the sand water mixture for sand grain in the sand water mixture can deposit in the bottom of inside precipitation chamber, and conveyor 507 can carry away the sand grain that inside precipitation intracavity was depositd, thereby realizes sand water separation.

The system operates in relation to the outlet section, which in a preferred embodiment comprises an overflow port 504 configured in the housing 502, as shown in fig. 2 and 3, in order to allow the system to operate in a continuous operation, the overflow port 504 being in communication with the internal settling chamber for continuous discharge of supernatant in an overflow manner; the height of the overflow port 504 can be determined according to actual requirements, and in a preferred embodiment, the height of the overflow port 504 can be the same as the height of the inlet 503 or higher than the height of the inlet 503, so that the space utilization rate of the inner settling chamber can be improved, and the continuous operation of the equipment can be realized in an overflow mode.

In this embodiment, by configuring the overflow port 504, in actual operation, sewage can continuously enter the cyclone desander 300 under the action of the lift pump 200, and can continuously discharge sand-water mixture from the sand discharge port 302, the sand-water mixture can continuously flow into the inner sedimentation chamber and can be precipitated in the inner sedimentation chamber, meanwhile, the screw conveying mechanism is also in a continuous operation state, so as to continuously convey sand precipitated at the bottom of the inner sedimentation chamber, and meanwhile, supernatant in the inner sedimentation chamber can continuously flow out from the overflow port 504 in an overflow manner, thereby realizing continuous separation of sand and water in the sewage.

In a more preferred embodiment, the cyclone desander 300 can be mounted on the bracket 304, and the height of the sand outlet 302 in the cyclone desander 300 can be higher than that of the inlet 503 in the sand-water separator 500, as shown in fig. 3, that is, there is a height difference between the sand outlet 302 and the inlet 503, so that the sand-water mixture discharged from the sand outlet 302 can automatically flow into the sand-water separator 500 under the action of internal pressure and self gravity, without additional power, which is beneficial to simplifying the structure and reducing the cost.

In a more sophisticated version, the system further comprises a first container 100 for containing the sewage, said lift pump 200 is in communication with said first container 100, as shown in fig. 3, and the water outlet (i.e. overflow 504) of the sand-water separator 500 may also be in communication with the first container 100, so that the water flowing out of the overflow 504 may flow back into the first container 100 for further desanding; in actual operation, sewage to be treated, such as municipal sewage, can be input into the first container 100, so that the first container 100 can temporarily store the sewage to be treated and can also contain water separated from the sand-water separator 500, and the problem of discharge of the effluent of the sand-water separator 500 is solved.

The first container 100 may be in various manners, for example, the first container 100 may be a pool, a tank or a ditch, and the first container 100 may be a reinforced concrete structure or a steel frame structure; as shown in fig. 3, in the present embodiment, the first container 100 is a water tank, and the lift pump 200 is installed in the first container 100.

The outlet of the sand-water separator 500 is connected to the first container 100 in various ways, for example, the overflow port 504 of the sand-water separator 500 can be connected to the first container 100 through a pipe and/or a channel; for example, as shown in fig. 3, the sand-water separator 500 may be installed in a sunken foundation pit 600 by a frame 510, the water tank may be disposed at one side of the sunken foundation pit 600, a drain channel 601 is configured at the bottom of the sunken foundation pit 600, as shown in fig. 3, the drain channel 601 communicates with the water tank through a drain pipe 602, so that the water outlet portion may communicate with the first container 100, and water discharged from the water outlet portion may flow into the first container 100 at the upstream in a gravity flow manner by its own weight without providing additional power.

For preventing the cyclone desander 300 from being blocked, the system further comprises a grating device 101 for intercepting sundries, wherein the grating device 101 can be arranged at the upstream of the lifting pump 200, as shown in fig. 3, the sewage to be treated can be sent into the cyclone desander 300 by the lifting pump 200 after passing through the grating device 101, so that the larger sundries in the sewage can be effectively intercepted by the grating device 101, the sundries are prevented from entering the cyclone desander 300, and the blocking problem of the cyclone desander 300 can be effectively solved.

In a specific implementation, the grating device 101 may include a coarse grating, and the coarse grating may be disposed in the water tank and divide the water tank into an upstream region 102 and a downstream region 103, as shown in fig. 3, the lift pump 200 is connected to the downstream region 103, and the sewage to be treated is firstly conveyed into the upstream region 102 and then passes through the grating device 101 to enter the downstream region 103, so that the sewage can be lifted into the cyclone desander 300 by the lift pump 200 to separate sand from water.

Of course, the grille arrangement 101 may also be a fine grille or the like, which is not illustrated here.

The system can realize continuous operation in an overflow mode through the overflow port 504 by matching the lifting pump 200, the cyclone desander 300 and the sand-water separator 500, and not only can effectively remove sand grains with a size of more than 200 mu m in sewage, but also can obviously improve the removal efficiency of fine sand grains with a size of less than 200 mu m in the actual operation process.

Example 2

In order to solve the problem of improving the removal efficiency of fine sand particles of 200 μm or less, the present embodiment 2 is mainly different from the above embodiment 1 in that the present embodiment provides a sewage desanding system, in which the outlet portion includes a drain opening 505 configured in the housing 502, and the drain opening 505 is configured below the inlet 503 for draining the supernatant in the internal settling chamber instead of overflowing the supernatant, as shown in fig. 4 and 5;

correspondingly, a first valve 701 for controlling on/off is arranged on the communication path of the cyclone desander 300 and the sand-water separator 500, as shown in fig. 5, for example, the cyclone desander 300 and the sand-water separator 500 can be communicated through a pipeline 201, and the first valve 701 can be arranged on the pipeline 201 so as to control whether the sand-water mixture enters the inner sedimentation cavity;

in addition, the system also comprises a second valve 702, wherein the second valve 702 is used for controlling the on/off of the water outlet 505; for example, the second valve 702 may be installed on a water outlet pipe communicated with the water outlet 505, as shown in fig. 5, the second valve 702 is used to control whether to discharge the supernatant in the inner settling chamber through the water outlet 505, in actual operation, through the cooperation of the first valve 701 and the second valve 702, the sand-water separator 500 in the present system may operate in a sequencing batch mode, specifically, during a single operation, when the first valve 701 is opened, the sand-water mixture may enter the inner settling chamber through the inlet 503, at this time, the conveying part 507 is in a shutdown state, the second valve 702 is in a closed state, when the sand-water mixture in the inner settling chamber reaches a set threshold value, the first valve 701 is closed, water feeding is stopped, the sand-water mixture is stationary for a certain time, so that the sand-water mixture entering the inner settling chamber may settle in the inner settling chamber without interference, in the sedimentation process, the water body in the inner sedimentation cavity does not flow and fluctuate, and is particularly beneficial to the effective sedimentation of fine sand grains below 200 mu m; when the set standing time is reached, the settled sand grains are positioned at the bottom of the inner settling cavity, and the supernatant is positioned above the sand grains, at this time, the second valve 702 can be opened, so that the supernatant in the inner settling cavity can be discharged out of the inner settling cavity through the water outlet 505, and the water amount in the inner settling cavity is greatly reduced; finally, the conveying part 507 is opened to discharge sand settled at the bottom of the inner settling chamber out of the inner settling chamber, and in the process, because the water amount in the inner settling chamber is small and the water body is in a static state, the disturbance on the settled sand is very small, the problems of sand re-lifting and back-mixing can be avoided as much as possible in the process of conveying the sand by the conveying part 507, the lifting separation of fine sand below 200 mu m is particularly facilitated, and the sand removal efficiency can be obviously improved; compared with the continuous operation mode described in the embodiment 1, the system can greatly reduce the disturbance of water body flow or fluctuation to the precipitated sand grains, is very beneficial to effective sedimentation and lifting separation of fine sand below 200 microns, not only can obviously improve the sand removal efficiency, but also can obviously improve the removal efficiency of the fine sand below 200 microns.

In specific implementation, the first valve 701 may be manually opened and closed by a human, in this case, the first valve 701 may be a manual valve commonly used in the prior art, and in addition, the first valve 701 may also be automatically opened and closed by a controller (such as a single chip microcomputer, a PLC, or the like), in this case, the first valve 701 may be an electric valve, a pneumatic valve, or an electromagnetic valve, so as to automatically control the on/off state of the inlet 503 by the controller; similarly, the second valve 702 may be manually opened and closed by a human, in which case, the second valve 702 may be a manual valve commonly used in the prior art, and in addition, the second valve 702 may be automatically opened and closed by a controller (such as a single chip microcomputer, a PLC, etc.), in which case, the second valve 702 may be an electric valve, a pneumatic valve, a solenoid valve, etc., so as to automatically control the on/off state of the drain opening 505 by the controller.

In order to discharge the supernatant in the inner settling chamber separately by using the water outlet 505, the position of the water outlet 505 needs to be set reasonably, and usually, the water outlet 505 can be configured at a position corresponding to the lower part of the inner settling chamber, as shown in fig. 4 and 5, but the specific installation height needs to be determined according to the actual water inflow and the sand content of the sand-water mixture, and the supernatant can be discharged smoothly only by making the height of the water outlet 505 higher than the thickness of the sand settled at the bottom of the inner settling chamber.

When the system is configured with the first container 100, as shown in fig. 5, the drain port 505 may be in communication with the first container 100, for example, as shown in fig. 5, water drained from the outlet pipe may fall directly down the drain channel 601 below, so that water flowing out of the drain port 505 may flow back into the first container 100 for re-sanding.

In order to solve the problem of the cooperative operation of the cyclone desander 300 and the sequencing batch type sand-water separator 500, in a more sophisticated scheme, the system further comprises a second container 400 for storing a sand-water mixture, the second container 400 is communicated with the sand discharge port 302 of the cyclone desander 300, as shown in fig. 6, and the cyclone desander 300 is communicated with the inlet 503 of the sand-water separator 500 through a pipeline 201, at this time, the first valve 701 may be arranged in the pipeline 201; in this scheme, the second container 400 is mainly used for temporarily storing the sand-water mixture discharged from the sand discharge port 302, so that in the actual operation process, the lift pump 200 and the cyclone desander 300 arranged upstream of the second container 400 can continuously operate, and the first valve 701, the spiral conveying mechanism and the second valve 702 arranged downstream of the second container 400 can work in a sequencing batch operation mode, that is, in a sequencing batch operation mode of "water inlet-sedimentation-water discharge-sand extraction", so that the whole system can realize sand-water separation in a sequencing batch manner, and the removal efficiency of fine sand particles below 200 μm can be remarkably improved.

In practical applications, the second container 400 may preferably be a sand cylinder, a tank, or the like, and only needs to temporarily store the sand-water mixture, for example, as shown in fig. 6, the second container 400 may be a sand cylinder, and in a preferred embodiment, the second container 400 may be directly installed below the sand outlet 302, and the installation height of the second container 400 may be higher than the installation height of the inlet 503 of the sand-water separator 500, as shown in fig. 6, the lower end of the second container 400 is communicated with the inlet 503 of the sand-water separator 500 through a pipe 201, so that the sand-water mixture exiting from the sand outlet 302 may fall into the second container 400 below under the action of internal pressure and gravity, and in a state where the first valve 701 is opened, the sand-water mixture in the second container 400 may also automatically flow into the sand-water separator 500 under the action of residual pressure and gravity without any additional power, not only is beneficial to simplifying the structure, but also can reduce the cost.

In this embodiment, when the water outlet portion only includes the water outlet 505 described in this embodiment, the system can only operate in a batch-type operation mode, and when the water outlet portion includes both the water outlet 505 described in this embodiment and the overflow port 504 described in embodiment 1, as shown in fig. 7, the system can operate in a batch-type operation mode by using the water outlet 505, and can also operate in a continuous operation mode by using the overflow port 504, at this time, the first valve 701 is always in an open state, and the second valve 702 is always in a closed state, which is not illustrated herein.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.

Claims (10)

1. A sewage desanding system is characterized by comprising a lifting pump for lifting sewage,

the water inlet of the cyclone desander is communicated with the lifting pump through a pipeline, and the bottom of the cyclone desander is provided with a sand discharge port for outputting a sand-water mixture;

and the inlet of the sand-water separator is communicated with the sand discharge port and is used for separating sand and water in the sand-water mixture through precipitation.

2. The sewage desanding system of claim 1 wherein the sand discharge in the cyclone desander is at a higher elevation than the inlet in the sand-water separator.

3. The sewage desanding system of claim 1 further comprising a grid device for intercepting debris, the grid device being disposed upstream of the lift pump, the sewage passing through the grid device and then being pumped by the lift pump into the cyclone desander.

4. The sewage desanding system of claim 1, wherein the sand-water separator comprises a settling section and a transport section for providing a settling space, wherein,

the settling section comprises a housing configured with an internal settling chamber, a water outlet section, and the inlet, the inlet and the water outlet section being in communication with the internal settling chamber, respectively;

the conveying part is communicated with the inner sedimentation cavity and is used for conveying sand grains sedimented in the inner sedimentation cavity out.

5. The sewage desanding system of claim 4 wherein the water outlet includes an overflow outlet configured in the housing;

and/or the water outlet part comprises a water outlet configured on the shell, and the water outlet is configured below the inlet and used for discharging supernatant liquid in the inner sedimentation cavity; a first valve for controlling on/off is arranged on a communication path of the cyclone desander and the sand-water separator; the water outlet device also comprises a second valve which is used for controlling the on/off of the water outlet.

6. The sewage sand removal system of claim 5, wherein the overflow port is disposed at a height that is the same as or higher than the inlet;

and/or the water outlet is configured at a position corresponding to the lower part of the inner sedimentation cavity;

and/or the first valve is a manual valve, an electric valve, a pneumatic valve or an electromagnetic valve;

and/or the second valve is a manual valve, an electric valve, a pneumatic valve or an electromagnetic valve.

7. The sewage desanding system according to claim 5, further comprising a second container for storing the sand-water mixture, wherein the second container is communicated with the sand discharge port of the cyclone desander, and the cyclone desander is communicated with the inlet of the sand-water separator through a pipe, and the first valve is disposed in the pipe.

8. The sewage desanding system of claim 7, wherein the second container is mounted below the sand discharge port and has a height greater than the inlet in the sand-water separator;

and/or the second container is a sand cylinder, a box body or a tank body.

9. The sewage desanding system of claim 5, further comprising a first container for holding sewage, wherein the effluent portion of the sand-water separator is in communication with the first container, and wherein the lift pump is in communication with the first container;

and/or the conveying part comprises a spiral conveying device, the spiral conveying device comprises a conveying groove and a spiral conveying mechanism arranged in the conveying groove, the conveying groove is obliquely arranged, the lower end of the shell is connected to the conveying groove, the inner settling cavity is communicated with the conveying groove, and the spiral conveying mechanism is used for driving the settled sand grains to be conveyed along the conveying groove and discharged from a discharge hole formed in the conveying groove.

10. The sewage desanding system of claim 9 wherein the first container is a basin, tank or ditch;

and/or the lift pump is installed in the first container;

and/or the overflow port is communicated with the first container;

and/or the water outlet is communicated with the first container;

and/or the device also comprises a frame, wherein the shell and/or the conveying trough are fixedly arranged on the frame and are in an inclined state;

and/or the spiral conveying mechanism comprises a motor and a spiral blade which is matched with the conveying groove and can be rotatably arranged in the conveying groove, and the motor is in transmission connection with the spiral blade and is used for driving the spiral blade.

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