Screening device for horizontal flow type granular sludge

Abstract

The utility model discloses a horizontal flow type granular sludge screening device which comprises a screening pool, a first side of the screening pool is communicated with a water inlet pipe, and a second side of the screening pool is communicated with a water drainage pipe; the backflow hopper is arranged in the screening tank and close to one end of the water inlet pipe, and the lower end of the backflow hopper is connected to the biological tank through a backflow pipe; and the sludge discharging hopper is arranged in the screening pool, is arranged close to one end of the water discharging pipe, and is connected to a sludge treatment workshop through a sludge discharging pipe. The granular sludge and floc sludge can be effectively screened, the granular sludge meeting the requirements can be domesticated, the culture period of the granular sludge is shortened, the risk of culture failure is reduced, and the production economy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a screening device for advection type granular sludge. Background Art

[0002] With the acceleration of urbanization, the problem of urban sewage treatment has received increasing attention from all walks of life. Traditional sewage treatment technology is no longer in line with the current development concept. Its excessive aeration and investment in chemicals lead to waste of manpower and financial resources. At present, cities and towns are in urgent need of new sewage treatment technology, and granular sludge is being promoted by various countries as a new technology. Compared with traditional floc sludge, granular sludge has higher processing load, excellent sedimentation, significant particle partitioning, rich microbial community, and can save 30% of electricity costs.

[0003] Although granular sludge has a good treatment effect, the cultivation process is very long and the operation and control are extremely complicated. At present, only a few sewage treatment plants in China have achieved granular sludge and have not achieved large-scale promotion. The transition of flocculent sludge to granular sludge in the existing process and the process operation of domesticating flocculent sludge into granular sludge are certainly important, but the flocculent sludge that is difficult to granulate will be screened out. At the same time, it is difficult to screen granular sludge in the existing secondary sedimentation tank, resulting in the screening step being ignored. Granular sludge that is directly domesticated without screening will not only prolong the process of granular sludge cultivation, but also increase the risk of cultivation failure. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0005] In view of this, the utility model provides a horizontal flow granular sludge screening device, wherein the screening device can screen granular sludge and floc sludge, which can accelerate the cultivation progress of granular sludge, reduce the risk of granular sludge cultivation failure, and improve production economy.

[0006] Specifically, the following technical solutions are included:

[0007] The utility model provides a screening device for advection type granular sludge, the screening device comprising:

[0008] A screening pool, wherein a first side of the screening pool is connected to a water inlet pipe, and a second side of the screening pool is connected to a drain pipe;

[0009] A reflux bucket is arranged in the screening pool, the reflux bucket is arranged close to one end of the water inlet pipe, and the lower end of the reflux bucket is connected to the biological pool through a reflux pipe;

[0010] A sludge discharge bucket is arranged in the screening pool, the sludge discharge bucket is arranged close to one end of the drainage pipe, and the sludge discharge bucket is connected to the sludge treatment workshop through the sludge discharge pipe.

[0011] Optionally, the screening device further comprises:

[0012] A transition bucket is arranged in the screening tank, the transition bucket is located between the return bucket and the mud discharge bucket, the lower end of the transition bucket is connected to a connecting pipe through a transition pipe, one end of the connecting pipe is connected to the return pipe, and the other end of the connecting pipe is connected to the mud discharge pipe;

[0013] A first valve, disposed on the connecting pipe, wherein the first valve is located between the return pipe and the transition pipe;

[0014] The second valve is arranged on the connecting pipe, and the second valve is located between the mud discharge pipe and the transition pipe.

[0015] Optionally, the area of ​​the large opening end of the return hopper is larger than the area of ​​the large opening end of the transition hopper, and the area of ​​the large opening end of the transition hopper is larger than the area of ​​the large opening end of the mud discharge hopper;

[0016] The outlet diameter of the return bucket is smaller than the outlet diameter of the transition bucket, and the outlet diameter of the transition bucket is smaller than the outlet diameter of the mud discharge bucket.

[0017] Optionally, the screening device also includes a working box, the screening pool is arranged in the working box through supporting legs, the lower end of the screening pool and the working box form a lower accommodating space, the first side of the screening pool and the working box form a first accommodating space, and the working box and the second side of the screening pool form a second accommodating space.

[0018] Optionally, a reflux pump is provided on the reflux pipe, and a sludge discharge pump is provided on the sludge discharge pipe. The reflux pipe, the reflux pump, the sludge discharge pipe and the sludge discharge pump are located in the lower accommodating space.

[0019] Optionally, the screening device further comprises a scraper assembly, wherein the scraper assembly is located above the screening pool, the scraper assembly is connected to the mud discharge pipe, and the scraper assembly is located in the working box.

[0020] Optionally, the scraper assembly comprises:

[0021] A scraper is arranged above the screening pool through a support plate, the scraper is used to move on the screening pool, and the moving direction of the scraper is perpendicular to the water flow direction;

[0022] A floating mud trough is arranged above the screening pool, the floating mud trough is located on one side of the moving direction of the scraper blade, and the floating mud trough is connected with the mud discharge pipe through a floating mud pipe.

[0023] Optionally, the bottom of the floating mud trough is inclined, an end of the floating mud trough close to the water inlet pipe is higher than an end of the floating mud trough close to the drainage pipe, and the floating mud pipe is arranged close to one end of the drainage pipe.

[0024] Optionally, a water inlet well is provided in the first accommodating space, the water inlet well is connected to the water inlet pipe, and water distribution holes distributed evenly are provided on the first side of the screening pool, the water distribution holes are connected to the water inlet well.

[0025] Optionally, a water outlet well is provided in the second accommodating space, the water outlet well is connected to the drainage pipe, a triangular weir is provided on the second side of the screening pool, the sharp angle of the triangular weir is arranged perpendicular to the water flow direction, and the triangular weir is connected to the water outlet well.

[0026] The present invention provides a device for screening horizontal flow granular sludge, wherein the screening device includes a screening pool and a return hopper and a sludge discharge hopper arranged in the screening pool, the first side of the screening pool is connected to the water inlet pipe, the second side of the screening pool is connected to the drain pipe, the water inlet pipe and the drain pipe are arranged opposite to each other, the return hopper is located on the side close to the water inlet pipe, the lower end of the return hopper is connected to the biological pool through the return pipe, since granular sludge has better performance than floc sludge, including sedimentation performance, denitrification performance, low energy consumption, etc., the granular sludge is pumped back to the biological pool to realize the replacement of floc sludge with granular sludge; the sludge discharge hopper is located on the side close to the drain pipe, the lower end of the sludge discharge hopper is connected to the sludge treatment workshop through the sludge discharge pipe, after the floc sludge is discharged to the sludge treatment workshop, it is processed into mud cake through the sludge treatment process and then transported out for landfill. Through such a setting, on the one hand, granular sludge and floc sludge can be effectively screened, and granular sludge that meets the requirements can be domesticated, shortening the cultivation cycle of granular sludge, reducing the risk of cultivation failure, and improving production economy; on the other hand, granular sludge screening can be completed without modifying existing process equipment, thereby improving modification efficiency and ensuring production economy.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic diagram of a device for screening advection-type granular sludge according to an embodiment of the utility model;

[0030] Figure 2 for Figure 1 A schematic diagram of AA of the illustrated embodiment;

[0031] Figure 3 for Figure 1 A schematic diagram of BB of the illustrated embodiment;

[0032] Figure 4 for Figure 1 A schematic diagram of the CC of the illustrated embodiment;

[0033] Figure 5 for Figure 1 A schematic diagram of the DD of the illustrated embodiment;

[0034] Figure 6 for Figure 3 Schematic diagram of the EE of the illustrated embodiment.

[0035] in, Figures 1 to 6 The corresponding relationship between the reference numerals and the component names is as follows:

[0036] 100 screening device, 101 water inlet pipe, 102 water inlet well, 103 water distribution hole, 104 water outlet well, 105 triangular weir, 106 drainage pipe, 107 return bucket, 108 transition bucket, 109 mud discharge bucket, 110 return pipe, 111 mud discharge pipe, 112 transition pipe, 113 first valve, 114 second valve, 115 return pump, 116 mud discharge pump, 117 connecting pipe, 118 mud scraping assembly, 1181 mud scraping plate, 1182 floating mud trough, 1183 floating mud pipe, 119 screening pool, 120 working box. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Before further describing the embodiments of the present invention in detail, the directional terms involved in the embodiments of the present invention, such as "upper part", "lower part" and "side part", do not have the meaning of limiting the protection scope of the present invention.

[0039] In order to make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0040] Figure 1 It is a schematic diagram of a device for screening advection granular sludge according to an embodiment of the utility model.

[0041] like Figure 1 As shown, one embodiment of the utility model provides a screening device for advection type granular sludge, the screening device comprising:

[0042] a screening tank, wherein a first side of the screening tank is connected to the water inlet pipe, and a second side of the screening tank is connected to the drain pipe;

[0043] A reflux bucket is arranged in the screening tank, the reflux bucket is arranged near one end of the water inlet pipe, and the lower end of the reflux bucket is connected to the biological tank through a reflux pipe;

[0044] The sludge discharge bucket is arranged in the screening tank, and is arranged near one end of the drainage pipe. The sludge discharge bucket is connected to the sludge treatment workshop through the sludge discharge pipe.

[0045] Among them, the screening device includes a screening pool and a return hopper and a sludge discharge hopper arranged in the screening pool. The first side of the screening pool is connected to the water inlet pipe, and the second side of the screening pool is connected to the drain pipe. The water inlet pipe and the drain pipe are arranged opposite to each other. The return hopper is located on the side close to the water inlet pipe, and the lower end of the return hopper is connected to the biological pool through the return pipe. Since granular sludge has better properties than flocculent sludge, including sedimentation performance, denitrification performance, low energy consumption, etc., the granular sludge is pumped back to the biological pool to realize the replacement of flocculent sludge with granular sludge; the sludge discharge hopper is located on the side close to the drain pipe, and the lower end of the sludge discharge hopper is connected to the sludge treatment workshop through the sludge discharge pipe. After the flocculent sludge is discharged to the sludge treatment workshop, it is processed into mud cake through the sludge treatment process and then transported out for landfill. Through such a setting, on the one hand, granular sludge and floc sludge can be effectively screened, and granular sludge that meets the requirements can be domesticated, shortening the cultivation cycle of granular sludge, reducing the risk of cultivation failure, and improving production economy; on the other hand, granular sludge screening can be completed without modifying existing process equipment, thereby improving modification efficiency and ensuring production economy.

[0046] Optionally, the present embodiment provides one water inlet pipe and multiple drainage pipes. Since the drainage pipe relies on gravity flow and no additional power device is provided, it is easy to get clogged. The provision of multiple drainage pipes is convenient for maintenance, and the horizontal flow granular sludge screening device can also be used normally. On the other hand, it also helps to ensure the uniformity of drainage and avoid turbulence. Since there is only one water inlet pipe and multiple drainage pipes are provided at the same time, the diameter of the water inlet pipe is usually larger than the diameter of the drainage pipe. In addition, since the drainage of the screening device is achieved by gravity flow, the height of the drainage pipe must be lower than the height of the water inlet pipe. Usually, the water inlet pipe is 0.2 to 0.5 meters higher than the drainage pipe.

[0047] It should be noted that the screening device of the present application can indirectly accelerate the cultivation of granular sludge and is an auxiliary tool for the cultivation of granular sludge. Because in the process of converting floc sludge into granular sludge, floc sludge has a larger specific surface area and will preferentially obtain nutrients, inhibiting the growth of granular sludge. The screening device of the present application utilizes the difference in sedimentation between granular sludge and floc sludge. Usually, the sedimentation of granular sludge is about 15 to 20 times that of floc sludge, that is, granular sludge is preferentially settled. Different partitions are used to isolate floc sludge from granular sludge, and floc sludge with poor sedimentation is discharged to ensure the living space of granular sludge, thereby helping to accelerate the cultivation of granular sludge. Such a setting does not affect the operation of the original process while assisting in accelerating the cultivation of granular sludge, and ensures the reliability and stability of granular sludge cultivation.

[0048] Among them, due to the significant difference in sedimentation between flocculent sludge and granular sludge (the direction of water flow is Figure 1 From left to right in the middle, the sedimentation direction is from top to bottom, realizing mud and water separation), so most of the floc sludge will not enter the return hopper, and the floc sludge and granular sludge can be effectively separated.

[0049] Optionally, the screened granular sludge enters the biological pool through a return pipe, and the flocculent sludge can be replaced by the granular sludge returning to the biological pool, wherein the biological pool is a structure for activated sludge to achieve nitrogen and phosphorus removal, and activated sludge is a general term for microbial communities and the organic and inorganic substances they are attached to, and flocculent sludge and granular sludge are different forms of activated sludge.

[0050] Figure 2 for Figure 1 Schematic diagram of AA of the illustrated embodiment.

[0051] In a possible implementation, Figure 2 and Figure 1 As shown, the screening device also includes:

[0052] A transition bucket is arranged in the screening tank, the transition bucket is located between the return bucket and the mud discharge bucket, the lower end of the transition bucket is connected to the connecting pipe through a transition pipe, one end of the connecting pipe is connected to the return pipe, and the other end of the connecting pipe is connected to the mud discharge pipe;

[0053] A first valve is arranged on the connecting pipe, and the first valve is located between the return pipe and the transition pipe;

[0054] The second valve is arranged on the connecting pipe, and the second valve is located between the mud discharge pipe and the transition pipe.

[0055] Among them, the return hopper, transition hopper and mud discharge hopper are in the shape of a quadrangular pyramid. The vertex of the return hopper is connected to the connecting pipe through a return pipe and then returns to the biological pool. The mud discharge hopper is connected to the connecting pipe through the mud discharge hopper and is connected to the sludge treatment workshop. The transition hopper is connected to the connecting pipe through a transition pipe. The first valve and the second valve are arranged on the connecting pipe, and the first valve and the second valve are located on both sides of the transition pipe. Optionally, the material of the return hopper, transition hopper and mud discharge hopper is usually stainless steel, which can increase the service life of the return hopper, transition hopper and mud discharge hopper, thereby increasing the service life of the screening device.

[0056] It should be noted that the three buckets of the return bucket, transition bucket and sludge discharge bucket work simultaneously to realize the screening function. Different buckets collect different types of sludge by utilizing the difference in the sedimentation properties of the two types of sludge. Usually, granular sludge settles faster, and most of the granular sludge falls into the return bucket. Granular sludge and flocculent sludge settle in the transition bucket at the same time, and most of the flocculent sludge falls into the sludge discharge bucket, thereby realizing the distinction between flocculent sludge and granular sludge. Among them, the return bucket, transition bucket and sludge discharge bucket are in the shape of a quadrangular pyramid, that is, there are four inclined plates, and the angle between the four inclined plates and the central axis is 30-75°.

[0057] It should be noted that the use of the transition bucket is adjusted according to the cultivation state of the granular sludge. Generally, in the early stage of cultivation, the transition bucket is used as part of the return bucket to reduce the loss of sludge. In the middle and late stages of granular sludge cultivation, the transition bucket is mainly used as part of the flocculent sludge. Specifically, in the early stage of cultivation, when the granular sludge with a particle size greater than 200um accounts for less than 30%, the first valve is opened and the second valve is closed; in the late stage of cultivation, when the granular sludge with a particle size greater than 200um accounts for more than 30%, the second valve is opened and the first valve is closed. In the early stage of granular sludge cultivation, the time period is long and the flocculent sludge still accounts for a large proportion. Excessive discharge of flocculent sludge will affect the overall sludge biomass of the biological pool. At this time, the transition bucket is used as a return bucket to increase the overall sludge return volume and ensure the nitrogen and phosphorus removal performance of the biological pool; in the late stage of cultivation, the proportion of granular sludge increases, and the concentration of granular sludge collected by the return bucket is high. The transition bucket is used as a sludge discharge bucket to strengthen the screening of granular sludge.

[0058] It can be understood that this embodiment divides the screening device into a recirculation zone, a transition zone and a sludge discharge zone according to the principle that the sedimentation differences of granular sludge and floccular sludge will accumulate at different positions during the horizontal flow, so as to meet the screening requirements of floccular sludge and granular sludge, accelerate the cultivation progress of granular sludge, reduce the risk of granular sludge cultivation failure, and improve production economy.

[0059] Specifically, a return pipe is installed at the bottom of the return hopper for the return of granular sludge, a sludge discharge pipe is installed at the bottom of the sludge discharge hopper for the discharge of flocculent sludge, and a transition pipe is installed at the bottom of the transition hopper for adjusting the partition ratio of granular sludge and flocculent sludge. The partition ratio of granular sludge and flocculent sludge is adjusted by arranging the first valve and the second valve on the connecting pipe.

[0060] Figure 3 for Figure 1 Schematic diagram of BB of the illustrated embodiment.

[0061] In a possible implementation, Figure 3 As shown, the area of ​​the large end of the return bucket is larger than that of the transition bucket, and the area of ​​the large end of the transition bucket is larger than that of the mud discharge bucket;

[0062] The outlet diameter of the return bucket is smaller than the outlet diameter of the transition bucket, and the outlet diameter of the transition bucket is smaller than the outlet diameter of the mud discharge bucket.

[0063] Among them, that is, the diameter of the return pipe is smaller than the diameter of the transition pipe, the diameter of the transition pipe is smaller than the diameter of the sludge discharge pipe, and at the same time, the inlet end area of ​​the return bucket is larger than the inlet end area of ​​the transition bucket, and the inlet end area of ​​the transition bucket is larger than the inlet end area of ​​the sludge discharge bucket. Such an arrangement can increase the collection area of ​​granular sludge, retain more granular sludge, avoid waste of granular sludge, and improve the cultivation efficiency of granular sludge.

[0064] In a possible implementation, Figure 1 As shown, the screening device also includes a working box, the screening pool is arranged in the working box through supporting legs, the lower end of the screening pool and the working box form a lower accommodating space, the first side of the screening pool and the working box form a first accommodating space, and the working box and the second side of the screening pool form a second accommodating space.

[0065] Among them, a screening box is also set outside the screening pool, and the water inlet pipe and outlet pipe connected to the screening pool, as well as various pipes connected to the reflux bucket, transition bucket and mud discharge bucket are concentrated in a working box. On the one hand, it meets the requirements of cleanliness of the production workshop, and on the other hand, it is more convenient to move the screening device to the required position, avoiding pipeline leakage caused by pipeline folding, and ensuring the service life of the pipeline.

[0066] In a feasible implementation manner, a reflux pump is provided on the reflux pipe, a sludge discharge pump is provided on the sludge discharge pipe, and the reflux pipe, the reflux pump, the sludge discharge pipe and the sludge discharge pump are located in the lower accommodating space.

[0067] Among them, by setting up the reflux pump, the granular sludge that meets the requirements is collected back into the biological pool, and by setting up the sludge discharge pump, the flocculent sludge is centrally pumped to the sludge treatment workshop for subsequent treatment. The reflux pipe, reflux pump, sludge discharge pipe and sludge discharge pump are centrally arranged in the lower accommodation space of the working box to avoid bending and folding of the pipes, thereby increasing the service life of the pipes and thus increasing the service life of the screening device.

[0068] In a possible implementation, Figure 1 As shown, the screening device also includes a mud scraping assembly, which is located above the screening pool, connected to the mud discharge pipe, and located in the working box.

[0069] Among them, the scraper assembly can collect the floating sludge on the top of the screening pool to one location, and then discharge it to the sludge treatment workshop through the sludge discharge pipe for subsequent treatment. Usually, activated sludge will float in an oxygen-deficient environment. The floating sludge will flow with the water flow, increasing the concentration of suspended solids in the effluent and affecting the effluent water quality. The scraper assembly will clean the floating sludge to the floating sludge tank and send it to the sludge treatment workshop together with the floc sludge for treatment. At the same time, it can also clean the floating objects in the water that are difficult to degrade, avoid clogging of the drain pipe, and extend the maintenance and repair time of the drain pipe.

[0070] In a feasible embodiment, the scraper assembly includes:

[0071] A scraper is arranged above the screening pool through a support plate, and the scraper is used to move on the screening pool, and the moving direction of the scraper is perpendicular to the water flow direction;

[0072] The floating mud trough is arranged above the screening pool, is located on one side of the moving direction of the scraper blade, and is connected with the mud discharge pipe through the floating mud pipe.

[0073] The scraper blade can realize the reciprocating motion of the scraper blade through the motor, or the telescopic rod can realize the reciprocating motion of the scraper blade to clean the floating mud. The flow direction of the water is from the water inlet pipe to the drain pipe. The moving direction of the scraper blade is perpendicular to the water flow direction, that is, Figure 3 The scraper blade can move in the up and down direction, and the size of the scraper blade matches the size of the screening pool, that is, the scraper blade can be located in the screening pool and above the return bucket (transition bucket, mud discharge bucket), without other restrictions. It should be noted that tracks are set on both sides of the screening pool, that is, on the side of the water inlet pipe and the side of the drainage pipe, and the scraper blade can achieve reciprocating movement on the track through a telescopic motor or a telescopic rod.

[0074] Specifically, through the setting of the scraper blade, the unprecipitated floating sludge above the screening pool can be scraped into the floating sludge tank, and connected to the sludge discharge pipe through the floating sludge pipe, that is, the floating sludge pipe can be connected to the sludge discharge pump, and the floating sludge in the floating sludge tank is transported to the sludge treatment workshop for subsequent treatment through the power of the sludge discharge pump.

[0075] Figure 6 for Figure 3 Schematic diagram of the EE of the illustrated embodiment.

[0076] In a possible implementation, Figure 6 As shown, the bottom of the floating mud trough is inclined, the end of the floating mud trough close to the water inlet pipe is higher than the end of the floating mud trough close to the drainage pipe, and the floating mud pipe is arranged close to one end of the drainage pipe.

[0077] Among them, the bottom of the floating mud tank is set at an angle, and the end of the floating mud tank close to the water inlet pipe is higher than the end of the floating mud tank close to the drain pipe, so that the floating mud in the floating mud tank can gather to the second side end of the screening pool, and the floating mud pipe is set close to one end of the drain pipe, thereby ensuring that the floating mud in the floating mud tank can be better pumped to the sludge treatment workshop, thereby ensuring the effective utilization of the floating mud.

[0078] It should be noted that the floating mud tank is set at an angle. Figure 6 As shown, such an arrangement facilitates the floating mud to gather at a lower place, which is beneficial for the floating mud to be discharged through the floating mud pipe. At the same time, the upper part of the floating mud groove is aligned with the lower surface of the scraper. In order to enable the floating mud pipe to be connected to the mud discharge pump, the lowest point of the floating mud groove is usually higher than the mud discharge pump, which facilitates the floating mud to be pumped out through the mud discharge pump.

[0079] Figure 4 for Figure 1 Schematic diagram of the CC of the illustrated embodiment.

[0080] In a possible implementation, Figure 4 As shown, a water inlet well is provided in the first accommodating space, the water inlet well is connected to the water inlet pipe, and water distribution holes distributed evenly are provided on the first side of the screening pool, the water distribution holes are connected to the water inlet well.

[0081] The water distribution holes are evenly distributed to ensure uniform distribution of water flow, thereby improving the screening efficiency of granular sludge and flocculent sludge. In this embodiment, water distribution holes are set on the adjacent side walls of the screening pool and the water inlet well. The water distribution holes can be circular, square, rectangular or triangular. The shape of the water distribution holes is not limited here, as long as the water flow can enter the screening pool from the water inlet well. It can be understood that the water in the water inlet well refers to the cement mixture, that is, the screening pool is used to screen the granular sludge and flocculent sludge in the cement mixture.

[0082] It should be noted that the water distribution hole can be a square, circle, rectangle, pentagon or regular polygon. Selecting multiple water distribution holes of the same shape and equidistantly distributing the multiple water distribution holes can ensure the uniformity of the water flow. It can be understood that when water starts to flow in, the cement mixture flows down from the inside of the return hopper. When the water overflows from the outlet well, the water flow direction is Figure 1 In the direction from left to right.

[0083] Figure 5 for Figure 1 Schematic diagram of the DD of the illustrated embodiment.

[0084] In a possible implementation, Figure 5 As shown, a water outlet well is provided in the second accommodating space, the water outlet well is connected to the drainage pipe, a triangular weir is provided on the second side of the screening pool, the sharp corner of the triangular weir is arranged perpendicular to the water flow direction, and the triangular weir is connected to the water outlet well.

[0085] The sharp corner of the triangular weir is perpendicular to the direction of the water flow, that is, the sharp corner of the triangular weir faces the top of the screening pool or the bottom of the screening pool. The triangular weir can also be set in a semicircular or rectangular shape, which can reduce the surface tension of the water and ensure the uniformity of drainage.

[0086] It should be noted that during the flow of the mud-water mixture in the screening device, the mud and water will be separated due to sedimentation, so the floc sludge will be discharged through the mud discharge pipe, and the clearer water will be discharged through the drain pipe, which is connected to the secondary sedimentation tank, a subsequent structure in the sewage treatment process.

[0087] Optionally, the screening device in this embodiment is mainly made of stainless steel, and each connecting pipeline is made of PP material, which ensures the service life of the screening device, extends the maintenance cycle, and thus improves the efficiency of granular sludge screening.

[0088] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0089] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the present invention disclosed herein. The present invention is intended to cover any variation, use, or adaptation of the present invention that follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only.

[0090] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for screening advection granular sludge, characterized in that: The screening device comprises: A screening pool, wherein a first side of the screening pool is connected to a water inlet pipe, and a second side of the screening pool is connected to a drain pipe; A reflux bucket is arranged in the screening pool, the reflux bucket is arranged close to one end of the water inlet pipe, and the lower end of the reflux bucket is connected to the biological pool through a reflux pipe; A sludge discharge bucket is arranged in the screening pool, the sludge discharge bucket is arranged close to one end of the drainage pipe, and the sludge discharge bucket is connected to the sludge treatment workshop through the sludge discharge pipe.

2. The device for screening advection granular sludge according to claim 1, characterized in that: The screening device also includes: A transition bucket is arranged in the screening tank, the transition bucket is located between the return bucket and the mud discharge bucket, the lower end of the transition bucket is connected to a connecting pipe through a transition pipe, one end of the connecting pipe is connected to the return pipe, and the other end of the connecting pipe is connected to the mud discharge pipe; A first valve, disposed on the connecting pipe, wherein the first valve is located between the return pipe and the transition pipe; The second valve is arranged on the connecting pipe, and the second valve is located between the mud discharge pipe and the transition pipe.

3. The device for screening advection granular sludge according to claim 2, characterized in that: The area of ​​the large opening end of the return hopper is larger than that of the large opening end of the transition hopper, and the area of ​​the large opening end of the transition hopper is larger than that of the large opening end of the mud discharge hopper; The outlet diameter of the return bucket is smaller than the outlet diameter of the transition bucket, and the outlet diameter of the transition bucket is smaller than the outlet diameter of the mud discharge bucket.

4. The device for screening advection granular sludge according to claim 1, characterized in that: The screening device also includes a working box, the screening pool is arranged in the working box through supporting legs, the lower end of the screening pool and the working box form a lower accommodating space, the first side of the screening pool and the working box form a first accommodating space, and the working box and the second side of the screening pool form a second accommodating space.

5. The device for screening advection granular sludge according to claim 4, characterized in that: The reflux pipe is provided with a reflux pump, the mud discharge pipe is provided with a mud discharge pump, and the reflux pipe, the reflux pump, the mud discharge pipe and the mud discharge pump are located in the lower accommodating space.

6. The device for screening advection granular sludge according to claim 4, characterized in that: The screening device further comprises a scraper assembly, which is located above the screening pool, is communicated with the mud discharge pipe, and is located in the working box.

7. The device for screening advection granular sludge according to claim 6, characterized in that: The scraper assembly comprises: A scraper is arranged above the screening pool through a support plate, the scraper is used to move on the screening pool, and the moving direction of the scraper is perpendicular to the water flow direction; A floating mud trough is arranged above the screening pool, the floating mud trough is located on one side of the moving direction of the scraper blade, and the floating mud trough is connected with the mud discharge pipe through a floating mud pipe.

8. The device for screening advection granular sludge according to claim 7, characterized in that: The bottom of the floating mud trough is inclined, one end of the floating mud trough close to the water inlet pipe is higher than one end of the floating mud trough close to the drainage pipe, and the floating mud pipe is arranged close to one end of the drainage pipe.

9. The device for screening advection granular sludge according to claim 4, characterized in that: A water inlet well is provided in the first accommodating space, and the water inlet well is communicated with the water inlet pipe. Water distribution holes distributed evenly are provided on the first side of the screening pool, and the water distribution holes are communicated with the water inlet well.

10. The device for screening advection granular sludge according to claim 4, characterized in that: A water outlet well is provided in the second accommodating space, and the water outlet well is connected to the drainage pipe. A triangular weir is provided on the second side of the screening pool, and the sharp angle of the triangular weir is perpendicular to the water flow direction, and the triangular weir is connected to the water outlet well.

Images