Integrated biochemical precipitation reactor

Abstract

The invention relates to the technical field of sewage treatment, and provides an integrated biochemical precipitation reactor which comprises a pool body, an anoxic zone in the center, an aerobic zone on the periphery and a circle of precipitation zone located on the outer portion of the upper portion of the aerobic zone, and a plurality of precipitation modules evenly distributed on the circumference are installed in the precipitation zone; the water inlet system is arranged at the middle upper part of the anoxic zone and is used for introducing sewage; the micro-aerobic aeration system is arranged at the bottoms of the anoxic zone and the aerobic zone and is used for aeration and stirring of the sewage; the water outlet system is arranged at the middle upper part of the settling zone and is used for discharging clear water out of the tank body; and the sludge discharge system is connected to the precipitation module and is used for discharging the sludge out of the tank body. According to the invention, the anoxic zone, the aerobic zone and the settling zone are integrated into a whole in an inner and outer annular arrangement structure, the integration level is high, the occupied area is smaller, the operation and maintenance are simpler and more convenient, the hydraulic retention time can meet the process technical parameters of biochemical reaction, and the reaction is more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an integrated biochemical precipitation reactor. Background Art

[0002] Sewage treatment plants mainly collect sewage through pipelines and then treat it centrally. They generally use pretreatment, physical and chemical treatment, biochemical treatment, disinfection and other processes to treat sewage to meet standards before discharging. In urban sewage treatment plants, the biochemical treatment system is the core treatment section and the key to achieving sewage treatment standards.

[0003] The biochemical treatment system of traditional sewage treatment plants generally adopts reinforced concrete structure, which has the following problems: 1. The reinforced concrete pool body involves a large amount of civil engineering work, which is easy to generate construction waste and has a large carbon emission. In addition, the construction process is long. In order to ensure the construction quality, maintenance is required and the overall construction period is long.

[0004] 2. Reinforced concrete pool bodies are generally constructed on-site using cast-in-place and other methods, which require high quality of construction workers and usually low construction accuracy. Errors in size, elevation, etc. will affect the installation and operation process of sewage treatment system equipment, and may cause the biochemical system to fail to operate normally and fail to meet design requirements.

[0005] 3. According to the structural design, the reinforced concrete tank body requires a bottom plate and pool wall of a certain thickness. The pool wall is usually more than 250mm and is reinforced. The overall cost is relatively high. When the service life of the sewage treatment plant ends, the reinforced concrete tank body can only be dismantled and scrapped. It cannot be used again and has almost no recycling value. Instead, a large amount of construction waste needs to be processed.

[0006] 4. The process corresponding to this structure generally adopts the form of "biochemical reaction tank + secondary sedimentation tank", which has low integration and occupies a large area. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides an integrated biochemical precipitation reactor, which replaces the traditional reinforced concrete structure of "biochemical reaction tank + secondary sedimentation tank" with an inner and outer ring structure, which can effectively improve construction accuracy, reduce floor space, shorten construction period, reduce construction cost, save investment, and is more environmentally friendly and can be recycled for secondary use.

[0008] To achieve the above object, the present invention provides the following technical solutions: Integrated biochemical precipitation reactor, including: The tank body comprises a central anoxic zone, an outer aerobic zone and a circle of sedimentation zone located on the upper outer part of the aerobic zone, wherein the sedimentation zone is equipped with a plurality of sedimentation modules evenly distributed around the circumference; A water inlet system, arranged in the middle and upper part of the anoxic zone, for introducing sewage; A micro-oxygen aeration system is provided at the bottom of the anoxic zone and the aerobic zone, and is used for oxygenating and stirring the sewage; A water outlet system is provided in the middle and upper part of the sedimentation area and is used to discharge clean water out of the pool body; and A sludge discharge system, connected to the sedimentation module, for discharging sludge out of the tank body; Wherein, the pool body is provided with a bottom plate and an inner ring partition and an outer ring partition which are concentric and vertically connected to the bottom plate; the area enclosed by the inner ring partition is the anoxic zone, the annular area between the inner ring partition and the outer ring partition is the aerobic zone, and the area enclosed by the sedimentation module and the outer ring partition is the sedimentation zone; a No. 1 water outlet is provided at the lower part of the inner ring partition to connect the anoxic zone and the aerobic zone, and a No. 2 water outlet is provided at the upper inner side of the sedimentation module to connect the aerobic zone and the sedimentation zone.

[0009] In one embodiment disclosed in the present application, the base plate includes a reinforced concrete slab, an inner ring T-shaped embedded part and an outer ring T-shaped embedded part. The reinforced concrete slab is cast-in-place on site. The inner ring T-shaped embedded part and the outer ring T-shaped embedded part are made of carbon steel or stainless steel and are synchronously embedded in the reinforced concrete slab. The inner ring partition plate and the outer ring partition plate are prefabricated in a factory from carbon steel or stainless steel plates and are welded to the inner ring annular T-shaped embedded parts and the outer ring annular T-shaped embedded parts on site, and concrete is poured on both sides of the weld for a second time; The sedimentation module is prefabricated from carbon steel or stainless steel plates in a factory and then welded on site to the inner side of the outer ring partition.

[0010] In one embodiment disclosed in the present application, the first water outlet includes a square hole, a first baffle and a second baffle; The square hole is opened at the lower part of the inner ring partition; The first baffle is an obtuse L-shaped structure, the upper part of which can completely block the square hole in the horizontal direction, and the lower part is welded to the inner ring baffle below the square hole and is located in the anoxic zone; The second baffle is obliquely arranged in the aerobic zone and welded to the inner ring partition below the square hole to form a V-shaped structure with the lower part of the first baffle.

[0011] In one embodiment disclosed in the present application, the second water outlet includes a strip hole, a water channel and a plurality of inclined pipes; The strip-shaped hole is opened at the upper inner part of the precipitation module; The water channel is supported by steel frames at its bottom and sides on the inner side of the sedimentation module obliquely below the strip hole; A plurality of the inclined pipes are installed in the water channel in an inclined and parallel manner.

[0012] In one embodiment disclosed in the present application, the water inlet system includes a water inlet pipe and a water inlet cylinder; One end of the water inlet pipe is connected to the sewage source, and the other end is connected to the top of the water inlet cylinder; The water inlet cylinder is supported by legs at the upper middle part of the anoxic zone, and its top is flush with the top of the inner ring baffle; The water inlet cylinder is a columnar metal cylinder made of the same material as the inner ring partition, and its cylinder body is densely covered with a plurality of water holes.

[0013] In one embodiment disclosed in the present application, the micro-oxygen aeration system includes an air inlet pipe and a first aeration plate and a second aeration plate respectively connected to the air inlet pipe; The air inlet pipe extends upward out of the reactor and is connected to the air source. The first aeration plate is arranged at the bottom of the anoxic zone, and the second aeration plate is arranged at the bottom of the aerobic zone.

[0014] In one embodiment disclosed in the present application, the micro-oxygen aeration system further comprises at least two submersible flow propellers; The submersible flow propellers are evenly distributed around the circumference at the bottom of the anoxic zone and staggered from the No. 1 aeration plate.

[0015] In one embodiment disclosed in the present application, the water outlet system includes a water collection tank and a water outlet pipe; The water collecting tank is annular in structure, which is arranged at the center of the upper part of all the sedimentation modules and the bottom of which is supported by the steel frame; The upper ends of both sides of the water collection tank are respectively provided with triangular weir plates, and the triangular weir plates can be adjusted up and down to facilitate the clear water in the sedimentation area to flow over to the water collection tank for collection; One end of the water outlet pipe is communicated with the lower outer portion of the water collecting tank, and the other end thereof penetrates through the outer ring partition plate to discharge clean water.

[0016] In one embodiment disclosed in the present application, the mud discharge system includes a mud discharge branch pipe, a mud discharge ring pipe and a mud discharge main pipe; The mud discharge branch pipe penetrates the outer ring partition from outside to inside and is connected one-to-one with the outside of the sedimentation module. The mud discharge ring pipe is located at the lower part of the outer side of the outer ring partition and is connected with all mud discharge branch pipes. The mud discharge main pipe is connected with the mud discharge ring pipe.

[0017] In one embodiment disclosed in the present application, a return system is also included for return of sludge and mixed liquor; The reflux system includes a sludge reflux pipe, a No. 1 gas lift pipe, a mixed liquor reflux pipe and a No. 2 gas lift pipe; One end of the sludge return pipe is connected to the lower inner part of the sedimentation module, and the other end passes through the inner ring partition and extends upward to the upper part of the anoxic zone; One end of the No. 1 gas lift pipe is connected to the middle of the upwardly extending section of the sludge return pipe, and the other end extends upward out of the reactor and is connected to the gas source to provide power for the return of the sludge; One end of the mixed liquid reflux pipe is connected to the middle part of the inner side of the precipitation module, and the other end extends upward to the upper part of the aerobic zone; One end of the No. 2 gas lift pipe is connected to the middle of the upwardly extending section of the mixed liquid reflux pipe, and the other end extends upward out of the reactor and is connected to the gas source to provide power for the reflux of the mixed liquid.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The anoxic zone, aerobic zone and sedimentation zone are integrated into one structure with inner and outer ring arrangements, which has high integration, smaller footprint, simpler operation and maintenance, and the hydraulic retention time can meet the process technical parameters of the biochemical reaction, making the reaction more efficient.

[0019] 2. Compared with the biochemical treatment system of traditional sewage treatment plants, this reactor adopts the mode of "factory prefabrication + on-site pouring construction & welding installation", combining concrete (plate body) with steel structure (sedimentation module, inner ring baffle and outer ring baffle, etc.), and replacing the traditional reinforced concrete structure of "biochemical reaction tank + secondary sedimentation tank" with the central anoxic zone and the circular aerobic zone and sedimentation zone. The overall structure is symmetrical and beautiful, which can effectively improve the construction accuracy, reduce the land occupation, shorten the construction period, reduce the cost, save investment, greatly reduce the amount of civil engineering, and has the advantages of energy saving, emission reduction and long service life; at the same time, it is more environmentally friendly. After the project service period ends, the tank body can be relocated for secondary utilization or the materials can be recycled, which has a high recycling value.

[0020] 3. Sewage enters the aerobic zone from the anoxic zone through the No. 1 water inlet. The structure composed of the square hole, the first baffle and the second baffle can make the water flow more uniform and smooth, effectively reducing the impact force. At the same time, the bottom water flow can prevent short-circuiting.

[0021] 4. The water inlet and outlet method in the water inlet system can dissipate energy and reduce the impact on dissolved oxygen in the anoxic zone. At the same time, the water distribution is more uniform, which is beneficial to the system response.

[0022] 5. Through the oxygenation and stirring of the No. 1 aeration plate and the No. 2 aeration plate, not only can sufficient dissolved oxygen be provided for the activated sludge microorganisms to meet their oxygen requirements in the metabolic process, but also the suspended matter in the pool can be prevented from sinking, and the contact between the organic matter in the pool and the microorganisms and dissolved oxygen can be strengthened, thereby promoting the oxidation and decomposition of the organic matter in the sewage.

[0023] 6. The No. 1 aeration plate can be used alternately with the submersible flow propeller, so that the anoxic zone can be switched to the anaerobic zone when necessary, thereby achieving the removal of organic matter in the sewage, improving the phosphorus removal effect, and reducing the consumption of phosphorus removal agents in the subsequent process stages.

[0024] 7. The sewage in the reactor is generally in the middle and out the periphery. The water flows through the water inlet cylinder, No. 1 water outlet and No. 2 water outlet in the middle and upper part of the anoxic zone and finally enters the water collection tank. The overall path is excellent, there is no short flow, the flow state is good, and the head loss is small.

[0025] 8. Compared with conventional reflux pumps, the air lift reflux method can adjust the aeration air supply according to the operating conditions, which is more convenient and energy-saving. Moreover, through reflux, the suspended solids concentration and microbial concentration in the anoxic zone and aerobic zone can be maintained at a certain level, which can effectively improve the stability of the sewage treatment process and ensure the efficient operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 The planar layout structure of the present invention is schematically shown in FIG. Figure 1 ; Figure 2 The planar layout structure of the present invention is schematically shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of the vertical cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the structure of the No. 1 water outlet; Figure 5 This is a schematic diagram of the structure of the No. 2 water outlet.

[0028] The following are the descriptions of the reference numerals: 100, pool body, 110, anoxic zone, 120, aerobic zone, 130, sedimentation zone, 140, sedimentation module, 150, bottom plate, 151, reinforced concrete plate, 152, inner ring T-shaped embedded parts, 153, outer ring T-shaped embedded parts, 154, concrete, 160, inner ring partition, 170, outer ring partition, 171, vent pipe, 180, No. 1 water inlet, 181, square hole, 182, first baffle, 183, second baffle, 190, No. 2 water inlet, 191, strip hole, 192, water channel, 193, inclined pipe, 194, steel frame; 200, water inlet system, 210, water inlet pipe, 220, water inlet cylinder, 221, water hole, 230, supporting leg; 300, micro-oxygen aeration system, 310, air inlet pipe, 320, aeration plate No. 1, 330, aeration plate No. 2, 340, submersible flow propeller; 400, water outlet system, 410, water collection tank, 420, water outlet pipe; 500, mud discharge system, 510, mud discharge branch pipe, 511, high branch pipe, 512, low branch pipe, 520, mud discharge ring pipe, 530, mud discharge main pipe; 600. Reflux system, 610. Sludge reflux pipe, 620. No. 1 gas lift pipe, 630. Mixed liquor reflux pipe, 640. No. 2 gas lift pipe. DETAILED DESCRIPTION

[0029] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0030] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] See also Figure 1 to Figure 5 As shown, the present invention provides an integrated biochemical precipitation reactor, comprising: The tank body 100 has a central anoxic zone 110, an outer aerobic zone 120, and a circle of sedimentation zone 130 located on the upper and outer part of the aerobic zone 120. The sedimentation zone 130 is equipped with a plurality of sedimentation modules 140 evenly distributed around the circumference. The water inlet system 200 is provided in the upper middle part of the anoxic zone 110 and is used to introduce sewage; The micro-oxygen aeration system 300 is provided at the bottom of the anoxic zone 110 and the aerobic zone 120 and is used for oxygenating and stirring the sewage; The water outlet system 400 is disposed in the upper middle portion of the sedimentation area 130 and is used to discharge clean water to the outside of the tank body 100; and The sludge discharge system 500 is connected to the sedimentation module 140 and is used to discharge the sludge outside the tank body 100; The tank body 100 is provided with a bottom plate 150 and an inner baffle 160 and an outer baffle 170 which are concentric and vertically connected to the bottom plate 150; the area enclosed by the inner baffle 160 is the anoxic zone 110, the annular area between the inner baffle 160 and the outer baffle 170 is the aerobic zone 120, and the area enclosed by the sedimentation module 140 and the outer baffle 170 is the sedimentation zone 130; a No. 1 water inlet 180 is provided at the lower part of the inner baffle 160 to connect the anoxic zone 110 with the aerobic zone 120, and a No. 2 water inlet 190 is provided at the upper inner side of the sedimentation module 140 to connect the aerobic zone 120 with the sedimentation zone 130.

[0037] The anoxic zone 110, the aerobic zone 120 and the sedimentation zone 130 are integrated into one structure with an inner and outer ring arrangement, which has a high degree of integration, occupies a smaller area, is easier to operate and maintain, and the hydraulic retention time can meet the process technical parameters of the biochemical reaction, so that the reaction is more efficient.

[0038] Specifically, the bottom plate 150 includes a reinforced concrete plate body 151, an inner ring T-shaped embedded part 152 and an outer ring T-shaped embedded part 153. The reinforced concrete plate body 151 is cast-in-place (the size and reinforcement are determined according to the structural design). The inner ring T-shaped embedded part 152 and the outer ring T-shaped embedded part 153 are made of carbon steel or stainless steel and are synchronously embedded in the reinforced concrete plate body 151. The inner ring partition 160 and the outer ring partition 170 are made of carbon steel or stainless steel plates (with the inner ring The materials of the annular T-shaped embedded parts 152 and the outer ring annular T-shaped embedded parts 153 are consistent, and the thickness of the plates is generally 6 to 10 mm according to structural calculations) are prefabricated in the factory and welded to the inner ring annular T-shaped embedded parts 152 and the outer ring annular T-shaped embedded parts 153 on site, and concrete 154 is poured for the second time on both sides of the weld; the sedimentation module 140 is made of carbon steel or stainless steel plates (consistent with the material of the outer ring partition 170) and is prefabricated in the factory and welded to the inner side of the outer ring partition 170 on site. The bottom plate 150 adopts a reinforced concrete plate body 151, which can reduce the amount of steel used, reduce the overall investment, and improve the stability and safety of the entire reactor; the inner ring partition plate 160 and the outer ring partition plate 170 are welded to the inner ring annular T-shaped embedded parts 152 and the outer ring annular T-shaped embedded parts 153 respectively, so as to form an anoxic zone 110 and an aerobic zone 120 with the reinforced concrete plate body 151 as the bottom, which are used for the biochemical reaction of sewage, and the inner ring annular T-shaped embedded parts 152 and the outer ring annular T-shaped embedded parts 153 are welded to the inner ring annular T-shaped embedded parts 152 and the outer ring annular T-shaped embedded parts 153. 53 can play a role in stopping water, and concrete 154 is poured twice on both sides of the welds of the inner ring partition 160, the outer ring partition 170 and the inner ring annular T-shaped embedded parts 152 and the outer ring annular T-shaped embedded parts 153 to fix and further stop water. The combination of the two can ensure the stability of the entire reactor and prevent water seepage; the sedimentation module 140 is welded to the inner side of the outer ring partition 170 to form a partially shared wall annular sedimentation area 130, which is used for secondary sedimentation of sewage and can save steel. It can be seen that, except for the reinforced concrete plate 151 and the secondary poured concrete 154, the other components of the tank body 100 are welded by carbon steel or stainless steel plates; in addition, the steel structures such as the sedimentation module 140, the inner ring partition 160 and the outer ring partition 170 can be prefabricated simultaneously in the factory, so that the construction and maintenance of the reinforced concrete plate 151 will not affect the construction period.Compared with the biochemical treatment system of the traditional sewage treatment plant, this reactor adopts the mode of "factory prefabrication + on-site pouring construction & welding installation", combines concrete (plate body 151) with steel structure (sedimentation module 140, inner ring baffle 160 and outer ring baffle 170, etc.), and replaces the "biochemical reaction tank + secondary sedimentation tank" of the traditional reinforced concrete structure with the central anoxic zone 110 and the circularly arranged aerobic zone 120 and sedimentation zone 130. The overall structure is symmetrical and beautiful, which can effectively improve the construction accuracy, reduce the land occupation, shorten the construction period, reduce the cost, save investment, greatly reduce the amount of civil engineering, and has the advantages of energy saving, emission reduction and long service life; at the same time, it is more environmentally friendly. After the project service period ends, the tank body 100 can be relocated for secondary utilization or the materials can be recycled, which has a high recycling value.

[0039] See also Figure 4 As shown, the No. 1 water inlet 180 includes a square hole 181, a first baffle 182 and a second baffle 183; the square hole 181 is opened at the lower part of the inner ring baffle 160; the first baffle 182 is an obtuse L-shaped structure, the upper part of which can completely block the square hole 181 in the horizontal direction, and the lower part is welded to the inner ring baffle 160 below the square hole 181 and is located in the anoxic zone 110; the second baffle 183 is obliquely arranged in the aerobic zone 120, and is welded to the inner ring baffle 160 below the square hole 181 to form a V-shaped structure with the lower part of the first baffle 182. Specifically, there are 8 No. 1 water inlets 180 arranged around the center of the pool body 100 and evenly distributed around the circumference, and the size of the square hole 181 is 200*200mm. Sewage enters the aerobic zone 120 from the anoxic zone 110 through the No. 1 water inlet 180. The structure composed of the square hole 181, the first baffle 182 and the second baffle 183 can make the water flow more uniform and smooth, effectively reducing the impact force. At the same time, the bottom water flow can prevent short-circuiting.

[0040] See also Figure 5 As shown, the second water inlet 190 includes a strip hole 191, a water channel 192 and a plurality of inclined tubes 193. The strip hole 191 is opened at the upper inner side of the sedimentation module 140. The water channel 192 is supported by a steel frame 194 at its bottom and side on the inner side of the sedimentation module 140 obliquely below the strip hole 191. The plurality of inclined tubes 193 are installed in the water channel 192 in an oblique and parallel manner. Specifically, the size of the strip hole 191 is 3000*50mm, the width of the water channel 192 is 800-1000mm, and the inclined angle of the inclined tube 193 is 60°. The sewage from the aerobic zone 120 enters the water channel 192 through the strip holes 191. According to the shallow pool sedimentation theory, the several inclined pipes 193 in the channel can promote the sedimentation of sludge and accelerate the separation of mud and water. The clean water flows over the bottom of the water channel 192 and enters the water outlet system 400. The separated sludge slides down along the inclined pipes 193 to the bottom of the sedimentation module 140 under the action of gravity, and is then discharged through the sludge discharge system 500.

[0041] The water inlet system 200 includes a water inlet pipe 210 and a water inlet cylinder 220. One end of the water inlet pipe 210 is connected to a sewage source (not shown in the figure), and the other end is connected to the top of the water inlet cylinder 220. The water inlet cylinder 220 is supported by legs 230 in the upper middle part of the anoxic zone 110, and its top is flush with the top of the inner ring partition 160. The water inlet cylinder 220 is a columnar metal cylinder with the same material as the inner ring partition 160, and its cylinder body is densely covered with a number of water holes 221. Specifically, the height of the water inlet cylinder 220 is about 1 / 3 to 1 / 2 of the total height of the reactor, and the aperture of the water holes 221 ranges from 30 to 80 mm. Sewage from the sewage source directly enters the water inlet cylinder 220 through the water inlet pipe 210, and then enters the anoxic zone 110 through a number of water holes 221 densely distributed on the cylinder body. This water inlet method can dissipate energy and reduce the impact on dissolved oxygen in the anoxic zone 110. At the same time, the water distribution is more uniform, which is conducive to the reaction of the system.

[0042] The micro-oxygen aeration system 300 includes an air inlet pipe 310 and an aeration plate No. 1 320 and an aeration plate No. 2 330 respectively connected to the air inlet pipe 310. The air inlet pipe 310 extends upward out of the reactor and is connected to an air source (not shown in the figure, the air source can be a magnetic suspension fan, an air suspension fan, a Roots blower, etc., which is not specifically limited in this embodiment). The aeration plate No. 1 320 is arranged at the bottom of the anoxic zone 110, and the aeration plate No. 2 330 is arranged at the bottom of the aerobic zone 120. Specifically, the aeration plate No. 1 320 and the aeration plate No. 2 330 both use microporous membrane aerators. The air from the air source enters the aeration plate No. 1 320 and the aeration plate No. 2 330 through the air inlet pipe 310 to force air into the sewage, so that the sewage in the pool contacts with the air for oxygenation, and stirs the liquid to accelerate the transfer of oxygen in the air to the liquid. This process not only provides sufficient dissolved oxygen for the activated sludge microorganisms to meet their oxygen requirements in the metabolic process, but also prevents the suspended matter in the pool from sinking, strengthens the contact between the organic matter in the pool and the microorganisms and dissolved oxygen, thereby promoting the oxidation and decomposition of organic matter in the sewage.

[0043] The micro-oxygen aeration system 300 further includes at least two submersible flowmakers 340, which are evenly distributed around the circumference at the bottom of the anoxic zone 110 and staggered with the No. 1 aeration plate 320 (i.e., no aeration plate is arranged below the submersible flowmakers). The No. 1 aeration plate 320 can be used alternately with the submersible flowmakers 340, so that the anoxic zone 110 can be switched to an anaerobic zone when necessary, thereby achieving the removal of organic matter in the sewage, improving the phosphorus removal effect, and reducing the consumption of phosphorus removal agents in the subsequent process stages.

[0044] The water outlet system 400 includes a water collecting tank 410 and a water outlet pipe 420. The water collecting tank 410 is annular in structure and is located at the center of all the sedimentation modules 140 and its bottom is supported by a steel frame 194. The upper ends of both sides of the water collecting tank 410 are respectively provided with triangular weir plates (not shown in the figure). The triangular weir plates can be adjusted up and down to facilitate the clear water in the sedimentation area to cross over to the water collecting tank 410 for collection. One end of the water outlet pipe 420 is connected to the lower part of the outer side of the water collecting tank 410, and the other end passes through the outer ring partition 170 to discharge the clear water. After being collected by the water collecting tank 410, the clear water is discharged from the water outlet pipe 420, without the need for a secondary sedimentation tank.

[0045] The sewage enters the reactor from the center and exits from the periphery. The water flows through the water inlet cylinder 220, the No. 1 water outlet 180, and the No. 2 water outlet 190 in the upper and middle part of the anoxic zone 110 and finally enters the water collection tank 410. The overall path is excellent, there is no short flow, the flow state is good, and the head loss is small.

[0046] The mud discharge system 500 includes a mud discharge branch pipe 510, a mud discharge ring pipe 520 and a mud discharge main pipe 530; the mud discharge branch pipe 510 penetrates the outer ring partition plate 170 from the outside to the inside and is connected to the outside of the sedimentation module 140 one-to-one, the mud discharge ring pipe 520 is located at the lower part of the outer side of the outer ring partition plate 170 and is connected to all mud discharge branch pipes 510, and the mud discharge main pipe 530 is connected to the mud discharge ring pipe 520. Specifically, the mud discharge branch pipe 510 is divided into a high-position branch pipe 511 and a low-position branch pipe 512, most of the high-position branch pipes 511 penetrate the outer ring partition plate 170 from the outside to the inside and are connected to the upper part of the outer side of most sedimentation modules 140 one-to-one, and a small part of the low-position branch pipes 512 penetrate the outer ring partition plate 170 from the outside to the inside and are connected to the lower part of the outer side of a few sedimentation modules 140 one-to-one (for example, in this embodiment, there are 10 branches evenly distributed around the circumference of the sedimentation module 140, including 8 high-position mud discharges and 2 low-position mud discharges). Through the high-position branch pipe 511 and the low-position branch pipe 512 , the sedimentation module 140 can discharge sludge alternately at high and low positions to screen out sludge with better sedimentation performance, thereby improving the processing efficiency of the reactor.

[0047] The above-mentioned integrated biochemical precipitation reactor also includes a reflow system 600 for reflow of sludge and mixed liquid. Specifically, the reflow system 600 includes a sludge reflow pipe 610, a No. 1 gas lift pipe 620, a mixed liquor reflow pipe 630 and a No. 2 gas lift pipe 640; one end of the sludge reflow pipe 610 is connected to the lower inner part of the sedimentation module 140, and the other end passes through the inner ring partition 160 and then extends upward to the upper part of the anoxic zone 110; one end of the No. 1 gas lift pipe 620 is connected to the middle part of the upward extension section of the sludge reflow pipe 610, and the other end extends upward out of the reactor and is connected to the gas source to provide power for the sludge reflow; one end of the mixed liquor reflow pipe 630 is connected to the middle part of the inner side of the sedimentation module 140, and the other end extends upward to the upper part of the aerobic zone 120; one end of the No. 2 gas lift pipe 640 is connected to the middle part of the upward extension section of the mixed liquor reflow pipe 630, and the other end extends upward out of the reactor and is connected to the gas source to provide power for the mixed liquor reflow. Under the action of the No. 1 air lift pipe 620, part of the sludge at the bottom of the sedimentation module 140 flows back to the upper part of the anoxic zone 110 through the sludge return pipe 610; under the action of the No. 2 air lift pipe 640, part of the mixed liquid in the middle of the sedimentation module 140 flows back to the upper part of the aerobic zone 120 through the mixed liquid return pipe 630. Compared with the conventional reflux pump, the air lift reflux form can adjust the aeration air supply according to the operation situation, which is more convenient and energy-saving; and through reflux, it can ensure that the suspended solid concentration and microbial concentration in the anoxic zone 110 and the aerobic zone 120 are maintained at a certain level, which can effectively improve the stability of the sewage treatment process and ensure the efficient operation of the system.

[0048] Combined with the above, the working principle of this reactor is as follows: Sewage from the sewage source directly enters the water inlet cylinder 220 through the water inlet pipe 210 of the water inlet system 200, and then enters the anoxic zone 110 of the tank body 100 through a plurality of water holes 221 densely distributed on the cylinder body. The sewage undergoes a biochemical reaction under the oxygenation and stirring action of the No. 1 aeration plate 320 of the micro-aerobic aeration system 300, and then enters the aerobic zone 120 through the No. 1 water inlet 180, and continues to react under the action of the No. 2 aeration plate 330, and then enters the sedimentation module 140 of the sedimentation zone 130 through the No. 2 water inlet 190 for mud and water separation, and the clean water goes up from the bottom of the water channel 192 to enter the water outlet system 400 and is collected by the annular water collection tank 410 and discharged through the water outlet pipe 420; the separated sludge is discharged along the inclined pipe 1 under the action of gravity. 93 naturally settles downward to the bottom of the sedimentation module 140, and then is discharged to the mud discharge ring pipe 520 by static pressure from the mud discharge branch pipe 510 of the mud discharge system 500 for collection, and finally discharged to the sludge storage or treatment system of the sewage treatment plant by the mud discharge main pipe 530; part of the sludge at the bottom of the sedimentation module 140 is refluxed to the upper part of the anoxic zone 110 through the sludge reflux pipe 610 under the action of the No. 1 air lift pipe 620 of the reflux system 600, and part of the mixed liquid in the middle of the sedimentation module 140 is refluxed to the upper part of the aerobic zone 120 through the mixed liquid reflux pipe 630 under the action of the No. 2 air lift pipe 640; when the reactor is overhauled, the entire reactor can be emptied through the vent pipe 171 arranged at the lower part of the outer side of the outer ring partition 170 and connected to the aerobic zone 120.

[0049] The reactor can be used individually or in parallel. The recommended number is no less than 2 for switching between them, so as to ensure that the biochemical treatment of sewage can still be carried out during maintenance.

[0050] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. An integrated biochemical precipitation reactor, characterized in that: include: The tank body comprises a central anoxic zone, an outer aerobic zone and a circle of sedimentation zone located on the upper outer part of the aerobic zone, wherein the sedimentation zone is equipped with a plurality of sedimentation modules evenly distributed around the circumference; A water inlet system, arranged in the middle and upper part of the anoxic zone, for introducing sewage; A micro-oxygen aeration system is provided at the bottom of the anoxic zone and the aerobic zone, and is used for oxygenating and stirring the sewage; A water outlet system is provided in the upper middle part of the sedimentation area and is used to discharge clean water out of the pool body; and A sludge discharge system, connected to the sedimentation module, for discharging sludge out of the tank body; The tank body is provided with a bottom plate and an inner baffle and an outer baffle which are concentric and vertically connected to the bottom plate; the area enclosed by the inner baffle is the anoxic zone, the annular area between the inner baffle and the outer baffle is the aerobic zone, and the area enclosed by the sedimentation module and the outer baffle is the sedimentation zone; a No. 1 water inlet is provided at the lower part of the inner baffle to connect the anoxic zone and the aerobic zone, and a No. 2 water inlet is provided at the upper inner side of the sedimentation module to connect the aerobic zone and the sedimentation zone; The first water inlet comprises a square hole, a first baffle and a second baffle, wherein the square hole is provided at the lower part of the inner baffle; the first baffle is an obtuse L-shaped structure, the upper part of which can completely block the square hole in the horizontal direction, and the lower part is welded to the inner baffle below the square hole and is located in the anoxic zone; the second baffle is obliquely arranged in the aerobic zone, and is welded to the inner baffle below the square hole to form a V-shaped structure with the lower part of the first baffle; The No. 2 water outlet includes a strip hole, a water channel and a plurality of inclined tubes. The strip hole is opened at the upper inner side of the sedimentation module. The water channel is supported by steel frames at its bottom and sides on the inner side of the sedimentation module obliquely below the strip hole. The plurality of inclined tubes are installed in the water channel in an inclined parallel form.

2. The integrated biochemical precipitation reactor according to claim 1, characterized in that: The bottom plate includes a reinforced concrete slab, an inner ring T-shaped embedded part and an outer ring T-shaped embedded part. The reinforced concrete slab is cast-in-place on site. The inner ring T-shaped embedded part and the outer ring T-shaped embedded part are made of carbon steel or stainless steel and are synchronously embedded in the reinforced concrete slab. The inner ring partition plate and the outer ring partition plate are prefabricated in a factory from carbon steel or stainless steel plates and are welded to the inner ring annular T-shaped embedded parts and the outer ring annular T-shaped embedded parts on site, and concrete is poured on both sides of the weld for a second time; The sedimentation module is prefabricated from carbon steel or stainless steel plates in a factory and then welded on site to the inner side of the outer ring partition.

3. The integrated biochemical precipitation reactor according to claim 1 or 2, characterized in that: The water inlet system includes a water inlet pipe and a water inlet cylinder; One end of the water inlet pipe is connected to the sewage source, and the other end is connected to the top of the water inlet cylinder; The water inlet cylinder is supported by legs at the upper middle part of the anoxic zone, and its top is flush with the top of the inner ring baffle; The water inlet cylinder is a columnar metal cylinder made of the same material as the inner ring partition, and its cylinder body is densely covered with a plurality of water holes.

4. The integrated biochemical precipitation reactor according to claim 3, characterized in that: The micro-oxygen aeration system comprises an air inlet pipe and a first aeration plate and a second aeration plate respectively connected to the air inlet pipe; The air inlet pipe extends upward out of the reactor and is connected to the air source. The first aeration plate is arranged at the bottom of the anoxic zone, and the second aeration plate is arranged at the bottom of the aerobic zone.

5. The integrated biochemical precipitation reactor according to claim 4, characterized in that: The micro-oxygen aeration system also includes at least two submersible flow propellers; The submersible flow propellers are evenly distributed around the circumference at the bottom of the anoxic zone and staggered from the No. 1 aeration plate.

6. The integrated biochemical precipitation reactor according to claim 1, characterized in that: The water outlet system includes a water collection tank and a water outlet pipe; The water collecting tank is annular in structure, which is arranged at the center of the upper part of all the sedimentation modules and the bottom of which is supported by the steel frame; The upper ends of both sides of the water collection tank are respectively provided with triangular weir plates, and the triangular weir plates can be adjusted up and down to facilitate the clear water in the sedimentation area to flow over to the water collection tank for collection; One end of the water outlet pipe is communicated with the lower outer portion of the water collecting tank, and the other end thereof penetrates through the outer ring partition plate to discharge clean water.

7. The integrated biochemical precipitation reactor according to any one of claims 1, 2, 4 to 6, characterized in that: The mud discharge system includes a mud discharge branch pipe, a mud discharge ring pipe and a mud discharge main pipe; The mud discharge branch pipe penetrates the outer ring partition from outside to inside and is connected one-to-one with the outside of the sedimentation module. The mud discharge ring pipe is located at the lower part of the outer side of the outer ring partition and is connected with all mud discharge branch pipes. The mud discharge main pipe is connected with the mud discharge ring pipe.

8. The integrated biochemical precipitation reactor according to claim 1 or 4, characterized in that: It also includes a return system for the return of sludge and mixed liquor; The reflux system includes a sludge reflux pipe, a No. 1 gas lift pipe, a mixed liquor reflux pipe and a No. 2 gas lift pipe; One end of the sludge return pipe is connected to the lower inner part of the sedimentation module, and the other end passes through the inner ring partition and extends upward to the upper part of the anoxic zone; One end of the No. 1 gas lift pipe is connected to the middle of the upwardly extending section of the sludge return pipe, and the other end extends upward out of the reactor and is connected to the gas source to provide power for the sludge return; One end of the mixed liquid reflux pipe is connected to the middle part of the inner side of the precipitation module, and the other end extends upward to the upper part of the aerobic zone; One end of the No. 2 gas lift pipe is connected to the middle of the upwardly extending section of the mixed liquid reflux pipe, and the other end extends upward out of the reactor and is connected to a gas source to provide power for the reflux of the mixed liquid.

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