Precipitator, biochemical pool thereof and sewage treatment method

Abstract

The invention provides a precipitator which comprises a hollow wall body, a water inlet is formed in the lower end of the wall body, a mud sliding plate and a side wall which are connected into a whole are sequentially arranged at the lower end of the wall body from bottom to top in the direction away from the water inlet, a treatment area is arranged in the wall body, and an upward channel is arranged outside the treatment area. The treatment area is sequentially provided with an exhaust area, a separation area and a clear water area from bottom to top, a lower inclined plate is arranged between the exhaust area and the separation area, an upper inclined plate is arranged between the separation area and the upward channel, a vertical plate is arranged between the clear water area and the upward channel, and the vertical plate is connected with the upper inclined plate. The invention further provides a biochemical pool with the built-in precipitator. The invention also provides a sewage treatment method. According to the precipitator, the biochemical pool thereof and the sewage treatment method provided by the invention, sludge can be precipitated and separated in the biochemical pool, and air disturbance cannot be generated in the sludge-water separation process.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and relates to a precipitator, a biochemical pool and a sewage treatment method, and specifically relates to a precipitator in a continuous flow sewage biochemical treatment process, and an equipment device and a specific sewage treatment method in which the precipitator is built into a biochemical pool to separate sewage and sludge. Background Art

[0002] In the traditional biochemical treatment process of sewage, the continuous flow treatment process is divided into a biochemical reaction section and a sewage sludge separation section (mud-water separation section). The reactor that realizes the biochemical reaction is called a biochemical tank (or biochemical reactor), and the reactor that realizes the sludge-water separation is called a sedimentation tank (or sedimentator). The biochemical tank and the sedimentation tank are often built separately. After being treated in the biochemical tank, the sewage enters the sedimentation tank, where the sludge and sewage are separated. The sewage is clarified and discharged from the upper part of the sedimentation tank, and the sludge is discharged from the bottom of the sedimentation tank. The discharged sludge contains microorganisms that are useful for sewage treatment. Part of the sludge flows back to the biochemical tank (this part of the sludge is called return sludge), and the other part of the sludge is discharged to the sludge treatment system for treatment (this part of the sludge is called residual sludge).

[0003] The biochemical pool and sedimentation pool are built separately. On the one hand, two structures need to be built, which increases the land demand and construction cost. On the other hand, the return of sludge requires a certain amount of energy consumption. There are sedimentation pools and biochemical pools built side by side, but in essence they are still separate entities.

[0004] Some precipitators are built into the biochemical pool, thus eliminating the need for an independent sedimentation pool. However, when the precipitator is placed in the biochemical pool, air will flow into the precipitator along with the water flow, disturbing the sedimentation area and thus affecting the effluent effect. At the same time, the sludge concentration in the sewage in the biochemical pool is very high, generally between 3000 and 8000 mg / L. During use, the precipitator may be blocked by the high concentration of sludge, thereby reducing the mud-water separation effect, and may be crushed by the heavy sludge deposited on it. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a precipitator, a biochemical pool and a sewage treatment method thereof. Through the optimized precipitator structure, the precipitator is installed inside the biochemical pool, and the biochemical pool and the precipitator are optimally combined together to achieve good mud-water separation, thereby eliminating the need to build an independent sedimentation tank. At the same time, the precipitator is designed with an optimized structure. Even if air enters the precipitator in the biochemical pool, it will not enter the separation area of ​​the precipitator, and will not cause air disturbance to the mud-water separation process.

[0006] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present invention provides a sedimentation tank, including a hollow wall body, a water inlet is provided at the lower end of the wall body, and a mud slide and a side wall connected as one body are provided in sequence from bottom to top in the direction away from the water inlet, a processing area is provided in the wall body, an upward channel is provided outside the processing area, and an exhaust area, a separation area, and a clean water area are provided in sequence from bottom to top in the processing area, a lower inclined plate is provided between the exhaust area and the separation area, an upper inclined plate is provided between the separation area and the upward channel, a vertical plate is provided between the clean water area and the upward channel, and the vertical plate is connected to the upper inclined plate.

[0007] A second aspect of the present invention provides a biochemical pool with a built-in precipitator, comprising a reaction pool body, wherein at least one precipitator is disposed in the reaction pool body.

[0008] The third aspect of the present invention provides a sewage treatment method, using the above-mentioned biochemical pool with a built-in precipitator, selected from any of the following methods:

[0009] 1) The sewage containing sludge is passed into the reaction tank, and the aerator provides air for aerobic biochemical reaction, and then flows into the sedimentation tank for mud and water separation;

[0010] 2) The sewage containing sludge is passed into the reaction tank, stirred and mixed by the agitator for anaerobic biochemical reaction, and then flows into the sedimentation tank for sludge and water separation.

[0011] As described above, the precipitator, biochemical pool and sewage treatment method provided by the present invention have the following beneficial effects:

[0012] (1) The present invention provides a precipitator and a biochemical pool and a sewage treatment method. The precipitator is installed inside the biochemical pool through an optimized precipitator structure, and the biochemical pool and the precipitator are optimally combined together, thereby eliminating the need to build an independent precipitator pool.

[0013] (2) The present invention provides a sedimentation tank, a biochemical pool and a sewage treatment method. The optimized sedimentation tank and the biochemical pool structure create favorable conditions for separating sludge from sewage. The separated sludge can slide smoothly from the sedimentation tank back to the biochemical pool, thereby achieving sedimentation and separation of sludge in the biochemical pool without the need to build a separate sedimentation tank.

[0014] (3) The present invention provides a precipitator, a biochemical pool and a sewage treatment method. Through the optimized structure of the precipitator and the biochemical pool, the air generated by the aerobic reaction or the anaerobic reaction in the biochemical pool will not enter the separation zone of the precipitator, and will not cause air disturbance to the mud-water separation process.

[0015] (4) The present invention provides a precipitator, a biochemical pool and a sewage treatment method. According to the pollutant concentration of the sewage to be treated and the effluent standard to be achieved, the reaction conditions are reasonably set, and a reasonable reaction is carried out in the biochemical pool. Finally, the sewage after the reaction is completed enters the precipitator built in the biochemical pool with the sludge to achieve separation.

[0016] (5) The precipitator, biochemical pool and sewage treatment method provided by the present invention have ingenious device design, simple structure, convenient use and low cost, and are easy to promote and apply in practical work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic structural diagram of a precipitator of the present invention.

[0018] Figure 2 It is a schematic structural diagram of a precipitator of the present invention having an intermediate inclined plate.

[0019] Figure 3 It is a schematic structural diagram of a biochemical pool with a built-in precipitator for aerobic reaction according to the present invention.

[0020] Figure 4 It is a schematic structural diagram of a biochemical pool with a built-in precipitator for anaerobic reaction according to the present invention.

[0021] Reference numerals

[0022] 1Reaction cell

[0023] 2. Sedimentation Tank

[0024] 21 Wall

[0025] 211 side wall

[0026] 212 Mudboard

[0027] 213 Water Inlet

[0028] 22 Exhaust area

[0029] 221 Exhaust port

[0030] 23 Separation Zone

[0031] 231 middle inclined plate

[0032] 2311 First intermediate inclined plate section

[0033] 2312 Second intermediate inclined plate section

[0034] 24 Qingshui District

[0035] 241 water outlet

[0036] 242 Water outlet

[0037] 25 Upward Channel

[0038] 26 Downward Incline

[0039] 261 First lower inclined plate section

[0040] 262 Second lower inclined plate section

[0041] 27 Incline

[0042] 271 First upper inclined plate section

[0043] 272 Second upper inclined plate section

[0044] 28 vertical boards

[0045] 281 First vertical plate section

[0046] 282 Second vertical plate section

[0047] 3 Aerator

[0048] 4. Agitator

[0049] x Angle between the board and the side wall

[0050] yThe angle between the first lower inclined plate segment and the second lower inclined plate segment

[0051] z1 Angle between the first upper inclined plate section and the first vertical plate section

[0052] z2 The angle between the second upper inclined plate section and the second vertical plate section

[0053] D Vertical spacing between adjacent first intermediate inclined plate sections

[0054] A1 Vertical distance between the first upper inclined plate section and the first lower inclined plate section

[0055] A2 Vertical spacing between the second upper inclined plate section and the second lower inclined plate section

[0056] B. Height of the sedimentation tank

[0057] M The horizontal distance between the non-connected ends of the first lower inclined plate segment and the second lower inclined plate segment

[0058] N The horizontal distance between the opposite sides of the water inlet DETAILED DESCRIPTION

[0059] See also Figures 1 to 4. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0060] A first aspect of the present invention provides a precipitator, such as Figure 1-2 As shown, it includes a hollow wall body, a water inlet is provided at the lower end of the wall body, and a mud slide and a side wall connected as one body are provided in sequence from bottom to top along the direction away from the water inlet, a processing area is provided in the wall body, an upward channel is provided outside the processing area, and an exhaust area, a separation area, and a clean water area are provided in sequence from bottom to top in the processing area, a lower inclined plate is provided between the exhaust area and the separation area, an upper inclined plate is provided between the separation area and the upward channel, a vertical plate is provided between the clean water area and the upward channel, and the vertical plate is connected to the upper inclined plate.

[0061] The above-mentioned sedimentation tank is used for mud and water separation.

[0062] In the above precipitator, if Figure 1-2 As shown, the horizontal distance between the two opposite sides of the water inlet is 800-2000 mm, specifically 800-1000 mm, 1000-2000 mm, 1200-1500 mm.

[0063] The wall body forms a closed surrounding area so as to separate the precipitator from other areas in the reaction tank.

[0064] In the above precipitator, if Figure 1-2 As shown, the cross-sectional area of ​​the area surrounded by the mud slide gradually increases from bottom to top, and the cross-sectional area of ​​the area surrounded by the side wall remains unchanged from bottom to top. The mud slide forms a structure that is inclined inward relative to the side wall, so that the precipitated sludge slides off the upper surface of the mud slide and finally slides back into the reaction tank through the water inlet.

[0065] In the above precipitator, if Figure 1-2 As shown, the mudskipper is inclined relative to the side wall toward the outside of the wall body.

[0066] In a preferred embodiment, Figure 1-2As shown, the angle between the mud slide and the side wall is 120°-150°, specifically 120°-130°, 130°-140°, 140°-150°, 130°-140°.

[0067] In the above precipitator, if Figure 1-2 As shown, the upper end of the upward passage is open, so as to facilitate the discharge of a small amount of gas that has not entered the exhaust zone during the biochemical reaction.

[0068] In the above precipitator, if Figure 1-2 As shown, an exhaust port is provided in the exhaust area.

[0069] In a preferred embodiment, Figure 1-2 As shown, the exhaust port is arranged in the area surrounded by the lower inclined plate of the exhaust zone. The exhaust port is used to discharge the air in the aerobic biochemical reaction or the gas generated by the anaerobic biochemical reaction.

[0070] In a further preferred embodiment, the exhaust port is connected to the outside of the precipitator through a pipeline, so as to directly discharge the air in the aerobic biochemical reaction or the gas generated by the anaerobic biochemical reaction out of the precipitator, thereby preventing the air or gas from accumulating in the exhaust area and eventually entering the upward channel from the lower edge of the exhaust area, thereby affecting the precipitation and separation effect.

[0071] like Figure 1-2 As shown, the exhaust area is the area in the upward channel and located above the water inlet and below the lower inclined plate.

[0072] In the above precipitator, if Figure 1-2 As shown, the lower inclined plate includes a first lower inclined plate segment and a second lower inclined plate segment, the first lower inclined plate segment is connected to the second lower inclined plate segment to form a herringbone shape, and the first lower inclined plate segment and the second lower inclined plate segment are respectively inclined from bottom to top toward the inner direction of the wall.

[0073] In a preferred embodiment, Figure 1-2 As shown, the horizontal distance between the non-connected ends of the first lower inclined plate segment and the second lower inclined plate segment is 1000-3000 mm, specifically 1000-2000 mm, 2000-3000 mm, 1500-2500 mm.

[0074] In a further preferred embodiment, Figure 1-2 As shown, the horizontal distance between the non-connected ends of the first lower inclined plate segment and the second lower inclined plate segment is greater than the horizontal distance between the opposite sides of the water inlet.

[0075] In the most preferred embodiment, Figure 1-2As shown, the horizontal distance (M) between the non-connected ends of the first lower inclined plate section and the second lower inclined plate section and the horizontal distance (N) between the opposite sides of the water inlet conform to formula (1), and the formula (1) is M / N=1.2~3.0.

[0076] The precipitator complies with the ratio range of formula (1), which can ensure that the bubbles (air bubbles or bubbles generated by biochemical reactions) in the wastewater entering the precipitator from the water inlet will enter the exhaust zone as much as possible under the action of buoyancy, and only a very small part will enter the upward channel.

[0077] In a preferred embodiment, Figure 1-2 As shown, the angle between the first lower inclined plate section and the second lower inclined plate section is 50°-100°, specifically 50°-60°, 60°-700°, 70°-80°, 80°-90°, 90°-100°, 60°-90°, and 70°-90°.

[0078] In a preferred embodiment, Figure 1-2 As shown, the first lower inclined plate segment and the second lower inclined plate segment are symmetrically distributed with the central axis of the wall as the center.

[0079] like Figure 1-2 As shown, the separation zone is a region within the upward channel and located above the lower inclined plate and below the upper inclined plate.

[0080] like Figure 1-2 As shown, the clean water area is an area within the upward channel and located within the vertical plate.

[0081] In the above precipitator, if Figure 1-2 As shown, the clean water area is provided with a water outlet trough, and the water outlet trough is provided with a water outlet. The water outlet trough and the water outlet are used to discharge the clarified sewage after sedimentation and separation from the sedimentation device, that is, after the clarified sewage flows into the water outlet trough, it is discharged through the water outlet.

[0082] In a preferred embodiment, the water outlet is connected to the outside of the sedimentation tank via a pipeline, so as to discharge the clarified sewage after sedimentation and separation out of the sedimentation tank.

[0083] In the above precipitator, if Figure 1-2 As shown, the upper inclined plate includes a first upper inclined plate segment and a second upper inclined plate segment, and the vertical plate includes a first vertical plate segment and a second vertical plate segment, the first vertical plate segment is connected to the first upper inclined plate segment, and the second vertical plate segment is connected to the second upper inclined plate segment, and the first upper inclined plate segment and the second upper inclined plate segment are respectively inclined from bottom to top toward the inside of the wall.

[0084] In a preferred embodiment, Figure 1-2 As shown, the first upper inclined plate segment and the second upper inclined plate segment are symmetrically distributed with the central axis of the wall as the center.

[0085] In a preferred embodiment, Figure 1-2 As shown, the angle between the first upper inclined plate section and the first vertical plate section is 120°-150°, specifically 120°-130°, 130°-140°, 140°-150°, 130°-140°; the angle between the second upper inclined plate section and the second vertical plate section is 120°-150°, specifically 120°-130°, 130°-140°, 140°-150°, 130°-140°.

[0086] In a further preferred embodiment, Figure 1-2 As shown, the angle between the first upper inclined plate segment and the first vertical plate segment is equal to the angle between the second upper inclined plate segment and the second vertical plate segment.

[0087] In a preferred embodiment, Figure 1-2 As shown, the first upper inclined plate segment is parallel to the first lower inclined plate segment, and the second upper inclined plate segment is parallel to the second lower inclined plate segment.

[0088] In a preferred embodiment, Figure 1-2 As shown, the vertical spacing distance between the first upper inclined plate segment and the first lower inclined plate segment is equal to the vertical spacing distance between the second upper inclined plate segment and the second lower inclined plate segment.

[0089] In a further preferred embodiment, Figure 1-2 As shown, the vertical spacing distance between the first upper inclined plate section and the first lower inclined plate section is 500-3000mm, specifically 500-1000mm, 1000-2000mm, 2000-3000mm, 1000-3000mm; the vertical spacing distance between the second upper inclined plate section and the second lower inclined plate section is 500-3000mm, specifically 500-1000mm, 1000-2000mm, 2000-3000mm, 1000-3000mm.

[0090] In the above precipitator, if Figure 2 As shown, at least one intermediate inclined plate is provided between the lower inclined plate and the upper inclined plate.

[0091] In a preferred embodiment, Figure 2 As shown, the intermediate inclined plate includes at least one first intermediate inclined plate segment and at least one second intermediate inclined plate segment, the first intermediate inclined plate segment is parallel to the first upper inclined plate segment and the first lower inclined plate segment respectively, and the second intermediate inclined plate segment is parallel to the second upper inclined plate segment and the second lower inclined plate segment respectively.

[0092] In a further preferred embodiment, Figure 2As shown, when there is one first intermediate inclined plate segment, the spacing distance between the first intermediate inclined plate segment and the first upper inclined plate segment is equal to the spacing distance between the first intermediate inclined plate segment and the first lower inclined plate segment; when there are at least two first intermediate inclined plate segments, the spacing distance between the first intermediate inclined plate segment and the first upper inclined plate segment is equal to the spacing distance between adjacent first intermediate inclined plate segments, and the spacing distance between the first intermediate inclined plate segment and the first lower inclined plate segment is equal to the spacing distance between adjacent first intermediate inclined plate segments.

[0093] In a further preferred embodiment, Figure 2 As shown, when there is one second intermediate inclined plate segment, the spacing distance between the second intermediate inclined plate segment and the second upper inclined plate segment is equal to the spacing distance between the second intermediate inclined plate segment and the second lower inclined plate segment; when there are at least two second intermediate inclined plate segments, the spacing distance between the second intermediate inclined plate segment and the second upper inclined plate segment is equal to the spacing distance between adjacent second intermediate inclined plate segments, and the spacing distance between the second intermediate inclined plate segment and the second lower inclined plate segment is equal to the spacing distance between adjacent second intermediate inclined plate segments.

[0094] In a further preferred embodiment, Figure 2 As shown, the first middle inclined plate segment and the second middle inclined plate segment are symmetrically distributed with the central axis of the wall as the center.

[0095] In a further preferred embodiment, Figure 2 As shown, the vertical spacing distance between adjacent first intermediate inclined plate sections is 30-500 mm, specifically 30-100 mm, 100-200 mm, 200-300 mm, 300-400 mm, 400-500 mm, 100-400 mm, and 200-400 mm.

[0096] In the above precipitator, if Figure 1-2 As shown, the height of the precipitator is 500-12000 mm, specifically 500-1000 mm, 1000-5000 mm, 5000-10000 mm, 10000-12000 mm.

[0097] In the above-mentioned sedimentation tank, the material of the mud slide plate, the side wall, the lower inclined plate, the upper inclined plate, the vertical plate, and the water outlet trough is selected from any one of glass fiber reinforced plastics, engineering plastics, carbon steel or stainless steel.

[0098] In the above-mentioned precipitator, the mud slide plate, side wall, lower inclined plate, upper inclined plate, vertical plate and water outlet trough in the same precipitator are made of the same material.

[0099] A second aspect of the present invention provides a biochemical pool with a built-in precipitator, such as Figure 3-4 As shown, it includes a reaction tank body, in which at least one precipitator as mentioned above is arranged.

[0100] The above-mentioned reaction tank body is the place where the biochemical reaction of sewage treatment occurs, and the area surrounded by the tank body is the reaction tank, that is, the biochemical tank.

[0101] In the above biochemical pool, the material of the reaction pool body is selected from any one of reinforced concrete, fiberglass, carbon steel or stainless steel.

[0102] In the above biochemical pool, Figure 3-4 As shown, an aerator and / or a stirrer is also provided in the reaction tank.

[0103] In a preferred embodiment, Figure 3 As shown, when the reaction tank is undergoing an aerobic biochemical reaction, an aerator is also provided in the reaction tank. The aerator is a conventional aerator.

[0104] In a further preferred embodiment, Figure 3 As shown, the aerator is arranged at the bottom of the reaction tank body.

[0105] In a preferred embodiment, Figure 4 As shown, when the reaction tank is aerobic biochemical reaction, the reaction tank is also provided with a stirrer, which is a conventional stirrer with a motor-driven stirring paddle.

[0106] In a further preferred embodiment, Figure 4 As shown, the stirrer includes a support rod, and a stirring paddle is arranged on one end of the support rod extending into the reaction tank body, and the stirring paddle is arranged at the bottom of the reaction tank body.

[0107] The third aspect of the present invention provides a sewage treatment method, using the above-mentioned biochemical pool with a built-in precipitator, selected from any of the following methods:

[0108] 1) The sewage containing sludge is passed into the reaction tank, and the aerator provides air for aerobic biochemical reaction, and then flows into the sedimentation tank for mud and water separation;

[0109] 2) The sewage containing sludge is passed into the reaction tank, stirred and mixed by the agitator for anaerobic biochemical reaction, and then flows into the sedimentation tank for sludge and water separation.

[0110] In the above sewage treatment method, the mud and water separation in the sedimentation tank includes the following steps:

[0111] A1) Sewage containing sludge enters the sedimentation tank from the water inlet under the action of water flow, enters the separation zone from the upward channel for mud and water separation, and the clarified sewage after separation enters the clean water zone, and is discharged from the sedimentation tank through the outlet through the outlet trough. The separated sludge sinks to the upper surface of the lower inclined plate to form a mud layer, and then automatically slides down along the lower inclined plate under the action of gravity, and then continues to slide down along the upper surface of the sliding mud plate, and slides back to the reaction tank body from the water inlet;

[0112] A2) In the aerobic biochemical reaction, the air provided by the aerator enters the settler through the water inlet, most of the air is discharged from the exhaust port in the exhaust zone, and a small part of the air floats up along the upward channel and overflows the water surface; and / or, in the anaerobic biochemical reaction, the gas generated by the agitator stirring and mixing enters the settler through the water inlet, most of the gas is discharged from the exhaust port in the exhaust zone, and a small part of the gas floats up along the upward channel and overflows the water surface.

[0113] In a preferred embodiment, in step A2), the air or gas will not enter the separation zone. That is, most of the air or gas is discharged from the exhaust port in the exhaust zone, and a small part of the air or gas floats up along the upward channel and overflows the water surface under the entrainment of sewage, and will not enter the separation zone of the sedimentation tank to affect the separation effect.

[0114] In the above sewage treatment method, the sedimentation device in the sewage treatment method performs mud-water separation in accordance with formula (2),

[0115] The formula (2) is q=Q / 2AB,

[0116] Where q is the separation load of the precipitator, m 3 / m 2 h (equivalent to m / h); Q is the water flow rate of the settler, m / h; A is the vertical spacing between the first upper inclined plate section and the first lower inclined plate section, m; B is the width of the settler, m.

[0117] In a preferred embodiment, the separation load of the precipitator is 0.5 to 3.0 m 3 / m 2 h, such as 0.5~1.0m 3 / m 2 h, 1.0~2.0m 3 / m 2 ·h, 2.0~3.0m 3 / m 2 ·h.

[0118] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0119] Example 1

[0120] like Figure 3 As shown, aerobic biochemical reactions are carried out in the AAO process wastewater biochemical reaction tank.

[0121] Specifically, a precipitator and an aerator are arranged in the reaction tank body of the biochemical tank. The aerator is installed at the bottom of the reaction tank body to provide the required air and dissolved oxygen for the aerobic biochemical reaction; the precipitator is installed above the reaction tank body. The sewage containing sludge is treated by the pretreatment unit at the front end and then introduced into the reaction tank body. The sewage and sludge in the reaction tank body are mixed under the action of air stirring. The sewage contains pollutants, and the sludge contains microorganisms that have a degrading effect on the pollutants, so that an aerobic biochemical reaction is carried out.

[0122] Then, the sewage containing sludge enters the sedimentation tank from the water inlet under the action of water flow, enters the separation zone from the upward channel for mud and water separation, and the clarified sewage after separation enters the clean water zone, and is discharged from the sedimentation tank through the outlet through the outlet trough. The separated sludge sinks to the upper surface of the lower inclined plate to form a mud layer, and then automatically slides down along the lower inclined plate under the action of gravity, and then continues to slide down along the upper surface of the mud slide plate, and slides back to the reaction tank from the water inlet. In the aerobic biochemical reaction, the air provided by the aerator enters the sedimentation tank from the water inlet, most of the air is discharged from the exhaust port in the exhaust zone, and a small part of the air floats up to the water surface along the upward channel under the entrainment of the sewage, and the air will not enter the separation zone to affect the separation effect.

[0123] In this biochemical pool with built-in sedimentation device, the total volume of the reaction pool is 1200m 3 The size is 24m (length) * 10m (width) * 6m (height), and the water depth is 5m. The sewage treatment capacity of this biochemical pool with built-in sedimentation device is 100m 3 / h, the hydraulic retention time (HRT, the same below) in the biochemical pool is 12 hours (HRT = 12h), that is, the sewage has been in the reaction tank for 12 hours from the time it enters the biochemical pool until it comes out from the outlet of the sedimentation tank.

[0124] The biochemical pool has 5 precipitators installed in the reaction tank. The size of each precipitator is 5m (length) * 2.4m (width) * 3.8m (height). The precipitator is made of stainless steel. The 5 precipitators are used in parallel. The clarified sewage is discharged from the outlet of each precipitator and then collected into a total outlet pipe and finally discharged from the reaction tank.

[0125] In each precipitator, Q = 20m 3 / h, A = 1.5m, B = 5.0m, then the separation load of the precipitator is q = Q / 2AB = 1.33m 3 / m 2·h. At the same time, M = 2500mm, N = 1250mm, then M / N = 2.0. In addition, x = 140°, y = 70°, z = 145°. After being treated in the biochemical pool and separated by mud and water in the sedimentation tank, the pollutants in the effluent are well removed, and the suspended solids concentration in the effluent is below 20mg / L.

[0126] Example 2

[0127] like Figure 4 As shown, anaerobic biochemical reactions are carried out in the hydrolysis acidification tank of a printing and dyeing factory wastewater treatment.

[0128] Specifically, a precipitator and a stirrer are arranged in the reaction tank body of the biochemical tank. The stirrer is installed in the lower part of the reaction tank body to provide the required sewage and sludge mixing power for the anaerobic biochemical reaction; the precipitator is installed in the upper part of the reaction tank body. The printing and dyeing sewage is treated by the pretreatment unit at the front end and then introduced into the reaction tank body. Under the stirring and mixing action of the stirrer, the sewage and sludge in the reaction tank body are mixed. The sewage contains pollutants, and the sludge contains microorganisms that have a degrading effect on the pollutants, thereby performing an anaerobic biochemical reaction.

[0129] Then, the sewage containing sludge enters the sedimentation tank from the water inlet under the action of water flow, enters the separation zone from the upward channel for mud and water separation, and the clarified sewage after separation enters the clean water zone, and is discharged from the sedimentation tank through the outlet through the outlet trough. The separated sludge sinks to the upper surface of the lower inclined plate to form a mud layer, and then automatically slides down along the lower inclined plate under the action of gravity, and then continues to slide down along the upper surface of the mud slide plate, and slides back to the reaction tank from the water inlet. The gas generated in the anaerobic biochemical reaction enters the sedimentation tank from the water inlet, and most of the gas is discharged from the exhaust port in the exhaust zone. A small part of the gas floats up to the water surface along the upward channel under the entrainment of the sewage, and the gas will not enter the separation zone to affect the separation effect.

[0130] In this biochemical pool with built-in sedimentation device, the total volume of the reaction pool is 1000m 3 The size is 20m (length) * 10m (width) * 6m (height), and the water depth is 5m. The sewage treatment capacity of this biochemical pool with built-in sedimentation device is 125m 3 / h, HRT=8h.

[0131] The biochemical pool has 5 precipitators in the reaction tank. The size of each precipitator is 6m (length) * 2.5m (width) * 3.6m (height). The precipitator is made of stainless steel. The 5 precipitators are used in parallel. The clarified sewage is discharged from the outlet of each precipitator and then collected into a total outlet pipe and finally discharged from the reaction tank.

[0132] In each precipitator, Q = 25m 3 / h, A = 1.6m, B = 6.0m, then the separation load of the precipitator is q = Q / 2AB = 1.30m 3 / m 2 ·h. At the same time, M = 2200mm, N = 800mm, then M / N = 2.75. In addition, x = 130°, y = 90°, z = 135°. After being treated in the biochemical pool and separated by mud and water in the sedimentation tank, the macromolecular pollutants in the effluent are well hydrolyzed and acidified, providing conditions for subsequent treatment, and the suspended solids concentration in the effluent is below 50mg / L.

[0133] Comparative Example 1

[0134] The biochemical reaction tank and the sedimentation tank are respectively set up, and a circular independent sedimentation tank is constructed in a traditional way, and its diameter is 12m. Compared with it, the biochemical tank with built-in sedimentator of Example 1 saves the construction land of the sedimentation tank, reduces the cost, removes more pollutants in the effluent, and has a lower concentration of suspended matter in the effluent.

[0135] Comparative Example 2

[0136] The biochemical reaction tank and the sedimentation tank are set up separately, and the diameter of the independent sedimentation tank built in the traditional way is 15m. Compared with it, the biochemical tank with built-in sedimentator in Example 2 saves the construction land of the sedimentation tank, reduces the cost, removes more pollutants in the effluent, and has a lower concentration of suspended matter in the effluent.

[0137] In summary, the present invention provides a precipitator and a biochemical pool and a sewage treatment method, which can achieve sludge sedimentation and separation in the biochemical pool without generating air disturbance in the sludge-water separation process. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0138] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A precipitator, characterized in that: The invention comprises a hollow wall body (21), a water inlet (213) is provided at the lower end of the wall body (21), and a mud slide (212) and a side wall (211) are connected as one body in sequence from bottom to top in a direction away from the water inlet (21); a processing area is provided inside the wall body (21), an upward channel (25) is provided outside the processing area, and an exhaust area (22), a separation area (23), and a clean water area (24) are provided in sequence from bottom to top in the processing area; a lower inclined plate (26) is provided between the exhaust area (22) and the separation area (23), an upper inclined plate (27) is provided between the separation area (23) and the upward channel (25), and a vertical plate (28) is provided between the clean water area (24) and the upward channel (25), and the vertical plate (28) is connected to the upper inclined plate (27).

2. The precipitator according to claim 1, characterized in that Includes any one or more of the following conditions: A1) the cross-sectional area of ​​the area enclosed by the mud slide (212) gradually increases from bottom to top, and the cross-sectional area of ​​the area enclosed by the side wall (211) remains unchanged from bottom to top; A2) the mud slide (212) is inclined relative to the side wall (211) toward the outside of the wall body; A3) the upper end of the upward passage (25) is open; A4) an exhaust port (221) is provided in the exhaust area (22); A5) the lower inclined plate (26) comprises a first lower inclined plate segment (261) and a second lower inclined plate segment (262), the first lower inclined plate segment (261) and the second lower inclined plate segment (262) being connected to form a herringbone shape, the first lower inclined plate segment (261) and the second lower inclined plate segment (262) being inclined from bottom to top toward the inner direction of the wall body (21); A6) a water outlet trough (241) is provided in the clean water area (24), and a water outlet (242) is provided in the water outlet trough (241); A7) the upper inclined plate (27) includes a first upper inclined plate section (271) and a second upper inclined plate section (272); the vertical plate (28) includes a first vertical plate section (281) and a second vertical plate section (282); the first vertical plate section (281) is connected to the first upper inclined plate section (271), and the second vertical plate section (282) is connected to the second upper inclined plate section (272); the first upper inclined plate section (271) and the second upper inclined plate section (272) are respectively inclined from bottom to top toward the inner direction of the wall body (21); A8) At least one intermediate inclined plate (231) is provided between the lower inclined plate (26) and the upper inclined plate (27).

3. The precipitator according to claim 2, characterized in that: Includes any one or more of the following conditions: A21) the angle x between the mud slide (212) and the side wall (211) is 120°-150°; A41) the exhaust port (221) is arranged in the area surrounded by the lower inclined plate (26) of the exhaust area (22); A51) the horizontal distance M between the non-connected ends of the first lower inclined plate section (261) and the second lower inclined plate section (262) is greater than the horizontal distance N between the opposite sides of the water inlet (213); A52) the angle y between the first lower inclined plate section (261) and the second lower inclined plate section (262) is 50°-100°; A53) the first lower inclined plate section (261) and the second lower inclined plate section (262) are symmetrically distributed with the central axis of the wall body (21) as the center; A71) the first upper inclined plate segment (271) and the second upper inclined plate segment (272) are symmetrically distributed with the central axis of the wall body (21) as the center; A72) the angle z1 between the first upper inclined plate section (271) and the first vertical plate section (281) is 120°-150°, and the angle z2 between the second upper inclined plate section (272) and the second vertical plate section (282) is 120°-150°; A73) the first upper inclined plate section (271) is parallel to the first lower inclined plate section (261), and the second upper inclined plate section (272) is parallel to the second lower inclined plate section (262); A74) the vertical spacing distance A1 between the first upper inclined plate section (271) and the first lower inclined plate section (261) is equal to the vertical spacing distance A2 between the second upper inclined plate section (272) and the second lower inclined plate section (262); A81) The intermediate inclined plate (231) includes at least one first intermediate inclined plate section (2311) and at least one second intermediate inclined plate section (2312), wherein the first intermediate inclined plate section (2311) is parallel to the first upper inclined plate section (271) and the first lower inclined plate section (261), respectively, and the second intermediate inclined plate section (2312) is parallel to the second upper inclined plate section (272) and the second lower inclined plate section (262), respectively.

4. The precipitator according to claim 3, characterized in that Includes any one or more of the following conditions: A511) The horizontal distance M between the non-connected ends of the first lower inclined plate section (261) and the second lower inclined plate section (262) and the horizontal distance N between the opposite sides of the water inlet (213) conform to formula (1), and the formula (1) is: M / N=1.2-3.0; A721) the angle z1 between the first upper inclined plate section (271) and the first vertical plate section (281) is equal to the angle z2 between the second upper inclined plate section (272) and the second vertical plate section (282); A811) When there is one first intermediate inclined plate segment (2311), the spacing distance between the first intermediate inclined plate segment (2311) and the first upper inclined plate segment (271) is equal to the spacing distance between the first intermediate inclined plate segment (2311) and the first lower inclined plate segment (261); when there are at least two first intermediate inclined plate segments (2311), the spacing distance between the first intermediate inclined plate segment (2311) and the first upper inclined plate segment (271) is equal to the spacing distance between adjacent first intermediate inclined plate segments (2311), and the spacing distance between the first intermediate inclined plate segment (2311) and the first lower inclined plate segment (261) is equal to the spacing distance between adjacent first intermediate inclined plate segments (2311); A812) When there is one second intermediate inclined plate segment (2312), the spacing distance between the second intermediate inclined plate segment (2312) and the second upper inclined plate segment (272) is equal to the spacing distance between the second intermediate inclined plate segment (2312) and the second lower inclined plate segment (262); when there are at least two second intermediate inclined plate segments (2312), the spacing distance between the second intermediate inclined plate segment (2312) and the second upper inclined plate segment (272) is equal to the spacing distance between adjacent second intermediate inclined plate segments (2312), and the spacing distance between the second intermediate inclined plate segment (2312) and the second lower inclined plate segment (262) is equal to the spacing distance between adjacent second intermediate inclined plate segments (2312); A813) The first intermediate inclined plate section (2311) and the second intermediate inclined plate section (2312) are symmetrically distributed with the central axis of the wall body (21) as the center.

5. A biochemical pool with a built-in precipitator, characterized in that: It comprises a reaction tank body (1), wherein at least one precipitator (2) according to any one of claims 1 to 4 is arranged in the reaction tank body (1).

6. The biochemical pool with built-in precipitator according to claim 5, characterized in that: An aerator (3) and / or a stirrer (4) is also provided in the reaction tank body (1).

7. The biochemical pool with built-in precipitator according to claim 6, characterized in that: When an aerobic biochemical reaction is carried out in the reaction tank body (1), an aerator (3) is further provided in the reaction tank body (1); And / or, when an aerobic biochemical reaction is carried out in the reaction tank body (1), a stirrer (4) is further provided in the reaction tank body (1).

8. A method for treating sewage, using a biochemical pool with a built-in precipitator according to any one of claims 1 to 2, selected from any one of the following methods: 1) The sewage containing sludge is passed into the reaction tank, and the aerator provides air for aerobic biochemical reaction, and then flows into the sedimentation tank for mud and water separation; 2) The sewage containing sludge is passed into the reaction tank, stirred and mixed by the agitator for anaerobic biochemical reaction, and then flows into the sedimentation tank for sludge and water separation.

9. The sewage treatment method according to claim 8, characterized in that: 1) or 2), the mud-water separation in the precipitator comprises the following steps: A) Sewage containing sludge enters the sedimentation tank from the water inlet under the action of water flow, enters the separation zone from the upward channel for mud and water separation, and the clarified sewage after separation enters the clean water zone, and is discharged from the sedimentation tank through the outlet through the outlet trough. The separated sludge sinks to the upper surface of the lower inclined plate to form a mud layer, and then automatically slides down along the lower inclined plate under the action of gravity, and then continues to slide down along the upper surface of the sliding mud plate, and slides back to the reaction tank body from the water inlet; B) In the aerobic biochemical reaction, the air provided by the aerator enters the settler through the water inlet, most of the air is discharged from the exhaust port in the exhaust zone, and a small part of the air floats up along the upward channel and overflows the water surface; and / or, in the anaerobic biochemical reaction, the gas generated by the stirring and mixing of the agitator enters the settler through the water inlet, most of the gas is discharged from the exhaust port in the exhaust zone, and a small part of the gas floats up along the upward channel and overflows the water surface.

10. The sewage treatment method according to claim 8, characterized in that: 1) or 2), in the sewage treatment method, the sedimentation device performs mud-water separation in accordance with formula (2), The formula (2) is q=Q / 2AB, Where q is the separation load of the precipitator, m 3 / m 2 h (equivalent to m / h); Q is the water flow rate of the precipitator, m / h; A is the vertical spacing between the first upper inclined plate section and the first lower inclined plate section, m; B is the width of the precipitator, m; Preferably, the separation load of the precipitator is 0.5 to 3.0 m 3 / m 2 ·h.

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