Sewage treatment device

Abstract

The utility model relates to a sewage treatment device. The sewage treatment device comprises a tank main body and a sludge reflux pump, the tank main body comprises a settling area and a filtering area, the sludge reflux pump is used for reusing dense medium particles, and the suspension concentration of the dense medium particles in the reactor is maintained, so that the effluent quality is ensured. Sewage enters the reaction hopper through the water inlet pipe, various colloids and suspended particles in the sewage are coagulated into large dense flocs and form a suspended sludge layer, and the sludge layer close to a normal pressure state is used for replacing a filtering medium in a conventional pressure filtering process to filter sludge; sludge is discharged into the sludge discharge area at the bottom of the reaction hopper through the sludge guide hopper and can return into the reaction hopper again through the sludge reflux pump to be fully reacted, and supernatant liquid flows to the peripheral filtering area through the top of the baffle to be filtered, so that the requirement of pretreated water quality is met. The sewage treatment device can be used for treating heavy sewage, and flocs and sludge in the reaction process are not prone to polluting and blocking parts.

Description

Technical Field

[0001] This application relates to the field of sewage treatment, and particularly to a sewage treatment device. Background Art

[0002] A comprehensive sewage treatment station was newly built at the site of the Jinchuan copper smelting process technology improvement project, including a production sewage treatment system and an initial rainwater treatment system. Among them, the initial rainwater treatment system uses the process of "polyferric + pH adjustment + heavy metal scavenger + flocculation filtration" to treat the initial rainwater at the end of the plant to meet the standards, and the produced water is discharged up to the standard, and the filtered sludge is discharged into the production sewage treatment process.

[0003] For the recycled water blowdown with high hardness, mine drainage, landfill leachate, and the concentrate water of industrial wastewater nanofiltration or reverse osmosis, due to the poor quality of the sewage, heavy medium particles are likely to cause fouling and blockage of the clarifier during the reaction process, increasing the time cost and money cost of operation and maintenance. Utility Model Content

[0004] In view of this, this application proposes a sewage treatment device, which can solve the problem that heavy medium particles are prone to fouling and blockage during the treatment of difficult-to-treat wastewater with a simple structure.

[0005] A sewage treatment device proposed according to this application includes: a pool main body and a sludge return pump.

[0006] The pool main body includes a sedimentation area and a filtration area; the sedimentation area is arranged in the middle of the pool main body, the filtration area surrounds the outer periphery of the sedimentation area, a baffle is arranged between the sedimentation area and the filtration area, and the tops of the sedimentation area and the filtration area are connected and arranged in communication; a reaction hopper and a mud guiding hopper are arranged in the sedimentation area; the top of the reaction hopper is open, and its top is hermetically connected to the baffle, the outer periphery and the bottom of the reaction hopper are a sludge discharge area, the mud guiding hopper is arranged above the bottom of the reaction hopper, and its top is open, and the bottom of the mud guiding hopper is communicated with the sludge discharge area; one side of the reaction hopper is connected with a water inlet pipe, and the water inlet pipe is communicated outside the pool main body and is suitable for communicating with the sewage to be treated; a drain pipe is connected and arranged at a position close to the bottom of the filtration area, and the drain pipe is communicated outside the pool main body; a pipeline connection is provided between the sludge discharge area and the inlet end of the sludge return pump, and a pipeline connection is provided between the outlet end of the sludge return pump and the water inlet pipe.

[0007] In a possible implementation manner, the water inlet pipe is horizontally arranged on one side of the reaction hopper, and the water inlet direction of the water inlet pipe is tangent to the side wall of the reaction hopper.

[0008] In a possible implementation manner, the included angle between the side wall of the reaction hopper and the horizontal direction is a second preset angle β, and the value range of the second preset angle β is: 45° ≤ β ≤ 75°.

[0009] In a possible implementation manner, the mud guide hopper includes a mud collection box and a mud conveying pipe; the top of the mud collection box is open; the mud conveying pipe is arranged at the bottom of the mud collection box, one end of the mud conveying pipe communicates with the mud collection box, and the other end communicates with the mud discharge area.

[0010] In a possible implementation manner, the mud conveying pipe is of a straight rod structure, and the number of the mud conveying pipes is multiple. The multiple mud conveying pipes are uniformly arranged along the outer periphery of the mud collection box and are distributed in a divergent manner outward from the bottom of the mud collection box; the included angle between the mud conveying pipe and the horizontal direction is a first preset angle α, and the value range of the first preset angle α is: 30° ≤ α ≤ 90°.

[0011] In a possible implementation manner, it further includes: inclined tube fillers and flushing nozzles; the inclined tube fillers are laid in the sedimentation area and are arranged near the top of the sedimentation area, the flushing nozzles are arranged at the bottom of the inclined tube fillers, and the flushing nozzles are connected to the water supply tank through pipelines.

[0012] In a possible implementation manner, a filter material is filled and arranged in the filtration area, the top height of the filter material is lower than the top height of the baffle, and the bottom height of the filter material is higher than the installation height of the drain pipe.

[0013] In a possible implementation manner, it further includes: a backwashing water outlet, a backwashing water inlet and a water distribution filter head; the water distribution filter head is arranged at the bottom of the filter material, both the backwashing water outlet and the backwashing water inlet are arranged on the main body of the pool, the installation height of the backwashing water outlet is equal to the height of the baffle, and the backwashing water inlet is arranged between the water distribution filter head and the water outlet.

[0014] In a possible implementation manner, it further includes a sludge discharge pump. The bottom of the mud discharge area is connected to the inlet end of the sludge discharge pump through a pipeline, and the outlet end of the sludge discharge pump is adapted to communicate with the outside of the device.

[0015] In a possible implementation manner, the top height of the mud guide hopper is higher than the top height of the reaction hopper.

[0016] Advantages of the present application: The pool main body includes a sedimentation area and a filtration area. The sedimentation area is used for the chemical reaction, flocculation, and clarification processes of sewage. The filtration area is used for filtering the clarified sewage. The sludge return pump is used to reuse the heavy medium particles, maintaining the suspended concentration of the heavy medium particles in the reactor, thereby ensuring the water quality of the effluent. Sewage enters the reaction hopper through the inlet pipe. Various colloids and suspended particles in the sewage coagulate into large, dense flocs and form a suspended sludge layer. The sludge layer under a nearly normal pressure state is used to replace the filter medium in the conventional pressure filtration process to filter the sludge. The sludge is discharged to the sludge discharge area at the bottom of the reaction hopper through the sludge guide hopper and can be returned to the reaction hopper through the sludge return pump to fully react again. The upper clear liquid flows to the peripheral filtration area through the top of the baffle for filtration, meeting the requirements for pre-treating the water quality. A sewage treatment device according to the present application can be used to treat heavy sewage, and the flocs and sludge during the reaction are not likely to clog the components.

[0017] Other features and aspects of the present application will become clear from the following detailed description of the exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings included in and constituting a part of the specification, together with the specification, illustrate the exemplary embodiments, features, and aspects of the present application and are used to explain the principles of the present application.

[0019] Figure 1 A cross-sectional structure diagram of a sewage treatment device showing an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will describe in detail various exemplary embodiments, features, and aspects of the present application with reference to the drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0021] Among them, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0023] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described herein as "exemplary" should not necessarily be construed as superior to or better than other embodiments.

[0024] In addition, for a better illustration of the present application, numerous specific details are given in the following detailed description. Those skilled in the art should understand that the present application can be implemented without some of these specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art are not described in detail so as to highlight the gist of the present application.

[0025] As Figure 1 shown, the sewage treatment device includes: a tank main body 100 and a sludge return pump 200.

[0026] The tank main body 100 includes a sedimentation area and a filtration area; the sedimentation area is disposed at the middle position of the tank main body 100, the filtration area is disposed around the outer periphery of the sedimentation area, a baffle 110 is disposed between the sedimentation area and the filtration area, and the tops of the sedimentation area and the filtration area are communicatively connected; a reaction hopper 121 and a sludge guiding hopper 122 are disposed in the sedimentation area; the reaction hopper 121 has a cone hopper structure with a smaller bottom and a larger top, the top of the reaction hopper 121 is hermetically connected to the baffle 110, and the outer periphery and the bottom of the reaction hopper 121 are a sludge discharge area 123, and the reaction hopper 121 is communicatively connected to the sludge discharge area 123; the top of the sludge guiding hopper 122 is open, the bottom of the sludge guiding hopper 122 is connected to the sludge discharge area 123, and the sludge guiding hopper 122 is communicatively connected to the sludge discharge area 123; a water inlet pipe 140 is connected to the reaction hopper 121, the water inlet pipe 140 communicates to the outside of the tank main body 100, a drain pipe 150 is connected to the filtration area near the bottom position, and the drain pipe 150 communicates to the outside of the tank main body 100; a pipeline connection is provided between the sludge discharge area 123 and the inlet end of the sludge return pump 200, and a pipeline connection is provided between the outlet end of the sludge return pump 200 and the water inlet pipe 140.

[0027] As shown in the figure, a circle close to the four peripheral side walls of the tank main body 100 is the outer peripheral direction, and conversely, a circle close to the longitudinal central axis is the inner peripheral direction.

[0028] The pool main body 100 is a pool structure with a hollow interior, in a cylindrical structure or a cuboid structure. Optimally, the pool main body 100 is in a cylindrical structure. The top of the pool main body 100 bulges, and an exhaust port 160 is provided at the bulging position. The exhaust port 160 is arranged on the central axis of the pool main body 100. A baffle 110 is arranged in the pool main body 100. The baffle 110 is used to divide the pool main body 100 into a sedimentation area and a filtration area, enclosing the inner peripheral sedimentation area into a cylindrical space. The filtration area outside the baffle 110 shows different forms according to the shape of the pool main body 100. In addition, the installation height of the baffle 110 is lower than that of the pool main body 100, and there is a preset distance at the top for the supernatant to flow from the sedimentation area into the filtration area.

[0029] As Figure 1 shown, the middle part of the pool main body 100 is the sedimentation area. The reaction hopper 121 is arranged in the middle and lower part of the sedimentation area, and there is a preset distance between the bottom of the reaction hopper 121 and the bottom of the sedimentation area. The preset distance can be flexibly set according to requirements. The bottom space of the side wall and the bottom plate of the reaction hopper 121 is the sludge discharge area 123. In this embodiment, the sedimentation area is in a cylindrical structure, the reaction hopper 121 is in a conical structure, and both the upper and lower parts of the conical structure are circular, and the circles at the top and the bottom are both horizontally arranged. The size of the circle at the top is the same as the top projection size of the sedimentation area. The periphery of the top of the reaction hopper 121 is hermetically connected to the side wall of the sedimentation area, that is, the inner periphery of the baffle 110. In this embodiment, the ratio of the bottom diameter of the reaction hopper 121 to the diameter of the sedimentation area is 1:6 - 1:4, the height of the reaction hopper 121 is 1 / 3 - 1 / 2 of the height of the sedimentation area, and the distance between the bottom of the reaction hopper 121 and the bottom of the pool main body 100 is 1 / 5 - 1 / 3 of the height of the reaction hopper 121.

[0030] The mud guiding hopper 122 is arranged in the sedimentation area. The bottom of the mud guiding hopper 122 is fixedly connected to the side wall of the reaction hopper 121, and the top height of the mud guiding hopper 122 is higher than the top height of the reaction hopper 121. The mud guiding hopper 122 includes a mud collecting box 1221 and a mud conveying pipe 1222. Among them, the mud collecting box 1221 is arranged in the middle of the circumferential direction and the height direction of the sedimentation area. The top height of the mud collecting box 1221 is higher than the top height of the reaction hopper 121, and the bottom height of the mud collecting box 1221 is lower than the top height of the reaction hopper 121. The mud collecting box 1221 is of a cuboid structure or a cylinder structure. Optimally, the mud collecting box 1221 is of a cylinder structure, and the diameter of the mud collecting box 1221 is 1 / 6 - 1 / 4 of the diameter of the sedimentation area. If the mud collecting box 1221 is of a cuboid structure, the longest side in the horizontal direction of the mud collecting box 1221 is 1 / 6 - 1 / 4 of the diameter of the sedimentation area. A sloping plate is arranged around the top of the mud collecting box 1221 and is inclined downward towards the inside of the mud collecting box 1221. The height of the sloping plate is less than 1 / 10 of the height of the mud collecting box 1221. The sloping plate is used to increase the mud collecting area at the top of the mud collecting box 1221 and prevent the top opening of the mud collecting box 1221 from being blocked. In addition, the mud conveying pipe 1222 is communicated with the mud collecting box 1221. The top of the mud conveying pipe 1222 is fixedly connected to the bottom of the mud collecting box 1221, and the connection position of the mud conveying pipe 1222 and the mud collecting box 1221 is at the edge position close to the bottom of the mud collecting box 1221. The bottom of the mud conveying pipe 1222 is connected to the side wall of the reaction hopper 121 and is communicated with the mud discharging area 123. The connection position of the water inlet pipe 140 and the reaction hopper 121 is set at a position slightly below the middle of the reaction hopper 121. The installation height of the mud conveying pipe 1222 is the same as the installation height of the mud collecting box 1221, and the pipe diameter of the mud conveying pipe 1222 is 1 / 5 - 1 / 4 of the diameter of the mud collecting box 1221. The number of the mud conveying pipes 1222 is multiple, and the included angle between the top views of two adjacent mud conveying pipes 1222 is the same. When the number of the mud conveying pipes 1222 is two, the included angle between the two mud conveying pipes 122 is 180°. When the number of the mud conveying pipes 1222 is three, the included angle between two adjacent mud conveying pipes 1222 is 120°. When the number of the mud conveying pipes 1222 is four, the included angle between two adjacent mud conveying pipes 1222 is 90°. And so on, but the number of the mud conveying pipes 1222 should not be too many. If the number of the mud conveying pipes 1222 is too many, it will cause the reaction hopper 121 to be blocked and the sludge cannot float on the top of the reaction hopper 121.

[0031] In the sedimentation area, inclined tube fillers 1241 are also arranged. The inclined tube fillers 1241 are laid at a position close to the top of the sedimentation area. The top height of the inclined tube fillers 1241 is lower than the top height of the baffle 110. The top projection shape of the inclined tube fillers 1241 is the same as the shape of the sedimentation area and has the same size. The height of the inclined tube fillers 1241 is 1 / 9 - 1 / 7 of the height of the sedimentation area. The flushing nozzles 1242 are attached to the bottom of the inclined tube fillers 1241, and the laying area of the flushing nozzles 1241 is smaller than the cross-sectional area of the sedimentation area.

[0032] The sewage enters the main body 100 of the tank through the water inlet of the water inlet pipe 140. The water inlet pipe 140 horizontally extends into the main body 100 of the tank from one side of the main body 100 of the tank. One end of the water inlet pipe 140 is communicated with the sedimentation area, and the other end extends outside the main body 100 of the tank. The sewage can be dosed before entering the water inlet pipe 140 and then quickly introduced into the main body 100 of the tank. More preferably, a dosing port 141 is provided on the water inlet pipe. The sewage first passes through the dosing port 141 after entering the pipe main body. The dosing port 141 is arranged outside the main body 100 of the tank, and the number of the dosing ports 141 can be multiple. Different agents can be added according to different types of sewage for reaction.

[0033] The sewage enters the main body 100 of the tank along the water inlet pipe 140 and first enters the reaction hopper 121. The reaction hopper 121 is a place for the sewage and the agent to fully react. The reaction hopper 121 is an inverted frustum structure, but the reaction hopper 121 is only provided with a bottom plate and a side wall. The diameter of the bottom plate of the reaction hopper 121 is about 1 / 5 of the diameter of the sedimentation area. The top of the reaction hopper 121 is open, and the top edge of the reaction hopper 121 is fitted with the baffle 110, so that there is no water leakage when the sewage liquid level exceeds the top of the reaction hopper 121. More importantly, the water inlet direction of the water inlet pipe 140 is tangent to the side wall of the reaction hopper 121. When the sewage tangentially enters the reaction hopper 121 at a certain flow rate, the sewage forms a swirl and slowly rises along the side wall of the reaction hopper 121, so that the colloid and suspended particles in the sewage are coagulated into large and dense flocs.

[0034] The generated high-concentration mud layer is suspended in the sewage. The high-concentration mud layer has a certain thickness and accumulates at a similar height position. Specifically, the suspension height is related to the type of sewage. The height of the top of the mud guide hopper 122 can be flexibly set according to the data of the sewage and the flocs generated, so that the height of the top of the mud guide hopper 122 is located between the high-concentration mud layers. The mud guide hopper 122 is composed of two parts, namely the mud collection box 1221 and the mud conveying pipe 1222. The top opening of the mud collection box 1221 is used to recover sludge. The sludge falls to the bottom in the mud collection box 1221 by gravity. The mud conveying pipe 1222 is arranged at the bottom of the mud collection box 1221 and is used to convey the sludge collected in the mud collection box 1221 to the mud discharge area 123. The top of the mud conveying pipe 1222 is connected between the side wall and the bottom of the mud guide hopper 122. The bottom of the mud conveying pipe 1222 is fixedly connected to the inner side wall of the reaction hopper 121, so that the bottom of the mud conveying pipe 1222 is communicated with the mud discharge area 123. Optimally, the number of the mud conveying pipes 1222 is multiple, and the included angle between two adjacent mud conveying pipes 1222 is equal; when the number of the mud conveying pipes 1222 is two, the included angle between the two mud conveying pipes 1222 is 180°; when the number of the mud conveying pipes 1222 is three, the included angle between two adjacent mud conveying pipes 1222 is 120°; when the number of the mud conveying pipes 1222 is four, the included angle between two adjacent mud conveying pipes 1222 is 90°, and so on. The number of the mud conveying pipes 1222 should not be too many, generally not exceeding six. If the number of the mud conveying pipes 1222 is too many, the reaction hopper 121 is easily blocked by the mud conveying pipes 1222 and the flocs generated in the sewage, resulting in that the flocs cannot rise to the top opening height of the mud guide hopper 122, so that the flocs cannot be discharged out of the pool body 100.

[0035] The bottom of the mud guide hopper 122 is fixedly connected to the inner side wall of the reaction hopper 121. The connection position height of the mud guide hopper 122 and the reaction hopper 121 is set at the middle position or the middle and upper position of the height of the reaction hopper 121. The top height of the mud guide hopper 122 is higher than the top of the reaction hopper 121.

[0036] The mud discharge area 123 is arranged at the bottom of the sedimentation area and is used to collect and precipitate the discharged sludge. A mud discharge port is arranged at the bottom of the sedimentation area. A pipeline is connected between the mud discharge port and the inlet end of the sludge return pump 200. A pipeline is connected between the outlet end of the sludge return pump 200 and the water inlet pipe 140. The pipeline connection between the sludge return pump 200 and the water inlet pipe 140 is arranged at the rear end of the chemical addition port 141 and is used to add medicine and react again to a part of the mud-water mixture in the mud discharge area 123, so that various colloids and suspended particles in the sewage can be coagulated into large and dense flocs, increasing the filtering effect of the mud layer. In addition, the mud discharge port is also connected to the mud discharge pump 300 through a pipeline and is used to discharge the sludge out of the device.

[0037] Continuous sewage enters the sedimentation area from the water inlet, and the sewage liquid level gradually rises. The supernatant after flocs are generated flows out towards the periphery after being treated by the inclined tube packing 1241 and flows out to the filtration area. Among them, the inclined tube packing 1241 is laid at a position close to the top of the sedimentation area, and the inclined tube packing 1241 is laid horizontally in one layer along the horizontal direction of the sedimentation area, and the top projection area of the inclined tube packing 1241 is equal to the top projection area of the sedimentation area. In addition, a water supply tank 1243 is provided. The water supply tank 1243 is connected to the bottom of the inclined tube packing 1241 through a pipeline, and a pipeline branch is provided at the bottom of the inclined tube packing 1241. The pipeline branch is arranged at the bottom of the inclined tube packing 1241, and a number of flushing nozzles 1242 are provided on the pipeline branch. The flushing nozzles 1242 are evenly arranged on the inclined tube packing 1241 to flush the inclined tube packing 1241 and prevent the inclined tube packing 1241 from being blocked. The number of pipeline branches should not be too many to avoid affecting the overflow of the supernatant.

[0038] The supernatant overflowing from the top of the sedimentation area reaches the filtration area by gravity. In the filtration area, the type and laying method of the filter material 131 can be flexibly set according to the type of sewage. The top height of the filter material 131 does not exceed the top height of the baffle 110. More preferably, the top height of the filter material 131 does not exceed the bottom height of the inclined tube packing 1241. A backwashing component is also provided in the filtration area. Among them, the water distribution filter head 134 is arranged at the bottom of the filter material 131, and the bottom of the water distribution filter head 134 is the backwashing water distribution area. The drain pipe 150 is arranged in the backwashing water distribution area. The backwashing water inlet 133 is flush with the water distribution filter head 134, and the backwashing water outlet 132 is flush with the top of the baffle 110 or slightly lower than the top height of the baffle 110. The backwater outlet also has the function of sewage overflow. Such a setting can prevent the supernatant from accumulating on the top of the filtration area and flowing back to the sedimentation area.

[0039] In a possible implementation manner, the reaction hopper 121 is an inverted frustum structure, the water inlet pipe 140 is horizontally arranged, and the arrangement direction of the water inlet pipe 140 is tangent to the side wall of the reaction hopper 121. The water inlet pipe 140 is arranged horizontally and tangent to the side of the reaction hopper 121, so that the sewage can enter the reaction hopper 121 tangentially. Since the sewage has a certain flow rate when entering, the sewage can spiral upward along the inner side wall of the reaction hopper 121, avoiding the blockage of the reaction hopper 121 and improving the reaction efficiency.

[0040] In a possible implementation manner, the included angle between the side wall of the reaction hopper 121 and the horizontal direction is the second preset angle β, and the value range of the second preset angle β is: 45° ≤ β ≤ 75°.

[0041] In a possible implementation manner, the top height of the mud guiding hopper 122 is higher than the top height of the reaction hopper 121.

[0042] In a possible implementation manner, the sludge guide hopper 122 includes a sludge collection box 1221 and a sludge delivery pipe 1222. The top of the sludge collection box 1221 is open, the sludge delivery pipe 1222 is arranged at the bottom of the sludge collection box 1221, one end of the sludge delivery pipe 1222 is communicatively connected with the sludge collection box 1221, and the other end of the sludge delivery pipe 1222 is communicatively connected with the sludge discharge area 123.

[0043] In a possible implementation manner, the number of the sludge delivery pipes 1222 is multiple, and the multiple sludge delivery pipes 1222 are uniformly arranged along the outer periphery of the sludge collection box 1221; the included angle between the sludge delivery pipe 1222 and the horizontal direction is a first preset angle α, and the value range of the first preset angle α is: 30° ≤ α ≤ 90°.

[0044] In a possible implementation manner, it further includes: inclined tube packing 1241 and flushing nozzles 1242; the inclined tube packing 1241 is laid in the sedimentation area and is arranged near the top of the sedimentation area, the flushing nozzles 1242 are arranged at the bottom of the inclined tube packing 1241, and the flushing nozzles 1242 are connected by pipelines to the water supply tank 1243.

[0045] In a possible implementation manner, filter media 131 is filled and arranged in the filtration area, the top height of the filter media 131 is lower than the top height of the baffle 110, and the bottom height of the filter media 131 is higher than the installation height of the drain pipe 150.

[0046] The filtration area is provided with a circle around the outside of the sedimentation area, and the circle of the filtration area is communicatively connected. Filter media 131 is arranged in the filtration area, and the type of the filter media 131 can be flexibly replaced according to the actual situation of the sewage. The top of the filter media 131 is lower than the installation height of the inclined tube packing 1241, and the laying height of the filter media 131 is 1 / 3 - 1 / 2 of the height of the filtration area.

[0047] In a possible implementation manner, it further includes: a backwashing water outlet 132, a backwashing water inlet 133, and a water distribution filter head 134; the water distribution filter head 134 is arranged at the bottom of the filter media 131, both the backwashing water outlet 132 and the backwashing water inlet 133 are arranged on the pool main body 100, the installation height of the backwashing water outlet 132 is equal to the height of the baffle 110, and the backwashing water inlet 133 is arranged between the water distribution filter head 134 and the water outlet. The backwashing water outlet 132, the backwashing water inlet 133, and the drain pipe 150 are arranged on the same side of the pool main body 100, which is convenient for the operation and maintenance of each water inlet and outlet.

[0048] In a possible implementation manner, it further includes a sludge discharge pump 300. The bottom of the sludge discharge area 123 is connected to the inlet end of the sludge discharge pump 300 by pipelines, and the outlet end of the sludge discharge pump 300 is suitable for being communicatively connected to the outside of the device.

[0049] In a possible implementation manner, the inclined tube packing 1241 is formed by arranging and combining a plurality of single inclined plates, and the width between the inclined plates is estimated by the following formula:

[0050]

[0051] where a is the width between the inclined plates, b is the spacing between adjacent inclined plates, Re is the Reynolds number, v is the dynamic viscosity of the supernatant, c is the length of the water passage hole in the inclined plate, f is the width of the water passage hole in the inclined plate, Q is the water flow rate through the water passage hole in the inclined plate, α is the included angle between two adjacent inclined plates, and β is a correction coefficient.

[0052] In a possible implementation manner, the total length of the inclined plate packing is estimated by the following formula:

[0053]

[0054] where L is the total length of the inclined plate packing, e is the Euler constant, b is the spacing between adjacent inclined plates, n is the expected sedimentation time coefficient, q is the average sedimentation velocity of suspended solids in the inclined plate of the lateral flow, and δ is a correction coefficient.

[0055] It should be noted that although a sewage treatment device is introduced by taking this application as an example as above, those skilled in the art can understand that this application should not be limited thereto. In fact, users can flexibly set each parameter according to personal preferences and / or actual application scenarios as long as the design is reasonable.

[0056] In this way, the pool main body includes a sedimentation area and a filtration area. The sedimentation area is used for the chemical reaction, flocculation and clarification processes of sewage, the filtration area is used for filtering the clarified sewage, and the sludge reflux pump is used to reuse the heavy medium particles to maintain the suspended concentration of the heavy medium particles in the reactor, thereby ensuring the effluent water quality. The sewage enters the reaction hopper through the water inlet pipe. Various colloids and suspended particles in the sewage coagulate into large and dense flocs and form a suspended sludge layer. The sludge layer under the near-normal pressure state is used to replace the filter medium in the conventional pressure filtration process to realize the filtration of sludge. The sludge is discharged to the sludge discharge area at the bottom of the reaction hopper through the sludge guiding hopper and can be returned to the reaction hopper again through the sludge reflux pump for full reaction. The supernatant flows to the peripheral filtration area through the top of the baffle for filtration to meet the requirements of pretreating the water quality. A sewage treatment device according to this application can be used to treat heavy sewage, and the flocs and sludge during the reaction process are not easy to block the components.

[0057] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A sewage treatment device, characterized in that, Including: A pool main body and a sludge return pump; The pool main body includes a sedimentation area and a filtration area; The sedimentation area is arranged in the middle of the pool main body, the filtration area surrounds the outer periphery of the sedimentation area, a baffle is arranged between the sedimentation area and the filtration area, and the top of the sedimentation area and the top of the filtration area are connected and arranged in communication; A reaction hopper and a mud guiding hopper are arranged in the sedimentation area; The top of the reaction hopper is open, and its top is hermetically connected to the baffle. The outer periphery and the bottom of the reaction hopper are a sludge discharging area. The mud guiding hopper is arranged above the bottom of the reaction hopper, and its top is open. The bottom of the mud guiding hopper is connected and arranged in communication with the sludge discharging area; One side of the reaction hopper is connected with a water inlet pipe, and the water inlet pipe is communicated to the outside of the pool main body and is suitable for communicating with the sewage to be treated; A drain pipe is connected and arranged at a position close to the bottom of the filtration area, and the drain pipe is communicated to the outside of the pool main body; The sludge discharging area and the inlet end of the sludge return pump are connected by a pipeline, and the outlet end of the sludge return pump and the water inlet pipe are connected by a pipeline.

2. The sewage treatment device according to claim 1, wherein The water inlet pipe is horizontally arranged on one side of the reaction hopper, and the water inlet direction of the water inlet pipe is tangent to the side wall of the reaction hopper.

3. The sewage treatment device according to claim 2, characterized in that, The included angle between the side wall of the reaction hopper and the horizontal direction is a second preset angle β, and the value range of the second preset angle β is: 45°≤β≤75°.

4. The sewage treatment device according to claim 2, characterized in that, It also includes: Inclined tube packing and flushing nozzles; The inclined tube packing is laid in the sedimentation area and is arranged close to the top of the sedimentation area. The flushing nozzles are arranged at the bottom of the inclined tube packing, and the flushing nozzles are connected by a pipeline with a water supply tank.

5. The sewage treatment device according to claim 4, characterized in that, Filter media are filled and arranged in the filtration area. The top height of the filter media is lower than the top height of the baffle, and the bottom height of the filter media is higher than the installation height of the drain pipe. It also includes:

6. The sewage treatment device according to any one of claims 1-5, characterized in that, A backwashing water outlet, a backwashing water inlet and water distribution filter heads; The water distribution filter heads are arranged at the bottom of the filter media. The backwashing water outlet and the backwashing water inlet are both arranged on the pool main body. The installation height of the backwashing water outlet is equal to the height of the baffle, and the backwashing water inlet is arranged between the water distribution filter heads and the water outlet. It also includes a sludge discharge pump. The bottom of the sludge discharging area and the inlet end of the sludge discharge pump are connected by a pipeline, and the outlet end of the sludge discharge pump is suitable for being communicated to the outside of the device.

7. The sewage treatment device according to any one of claims 1-5, characterized in that The top height of the mud guiding hopper is higher than the top height of the reaction hopper.

8. The sewage treatment device according to claim 7, wherein ​ ​ ​ 9. The sewage treatment device according to any one of claims 1-5, characterized in that, ​ 10. The sewage treatment device according to claim 3, characterized in that, ​

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