Aerobic three-phase separation reactor, water treatment system and recycle ratio adjusting method thereof

Abstract

The invention discloses an aerobic three-phase separation reactor, a water treatment system and a recycle ratio adjusting method of the water treatment system, and belongs to the technical field of environment-friendly sewage treatment. The aerobic three-phase separation reactor comprises a water guide area which is an interlayer space formed by sleeving an outer tank and an inner tank, the inner tank is arranged in the outer tank, and a lower port of the inner tank is communicated with the outer tank; a plurality of water inlets are formed in the outer tank corresponding to the water guide area, and a backflow regulator is arranged above the water inlets; the water distribution and energy dissipation area is positioned in the inner tank and is communicated with the water guide area; the clarification area is positioned in the inner tank and above the water distribution and energy dissipation area; the clear water area is located in the inner tank and above the clarification area, an effluent weir is arranged, and a water outlet is formed in the junction of the effluent weir and the outer tank; and the sludge bucket area is positioned in the outer tank and below the water distribution and energy dissipation area. The water treatment system comprises the aerobic three-phase separation reactor and provides a recycle ratio adjusting method. According to the invention, the water inlet flow of the aerobic three-phase separation reactor is adjusted, and the recycle ratio of the water treatment system is accurately adjusted.

Description

Technical Field

[0001] This invention belongs to the field of environmental wastewater treatment technology, and more specifically, relates to an aerobic three-phase separation reactor, a water treatment system and a method for adjusting the circulation ratio. Background Technology

[0002] With the increase in industrial wastewater discharge and the intensified fluctuations in the quality and quantity of urban sewage, the drawbacks of the traditional "separation-recirculation independent control" mode are becoming increasingly apparent. External recirculation equipment has a slow response, high energy consumption, and cannot dynamically match the circulating water volume according to the real-time flow field and sludge characteristics inside the three-phase separator, resulting in hydraulic imbalance within the tank. 1) When the circulating water volume is insufficient under low flow conditions, it causes reverse flow of mud and water, which interferes with sludge sedimentation and reduces sedimentation efficiency. 2) When the circulating water volume is excessive under high flow conditions, it will cause severe disturbance to the sludge at the bottom of the inclined tube and inclined plate, and the sludge loss rate will increase significantly. At the same time, the installation error will cause a large deviation in the flow rate of each inlet.

[0003] 3) The traditional three-phase separator lacks a precise standard for the length of the inner energy dissipation air guide plate, resulting in insufficient gas release rate. The single-layer air-blocking structure has low efficiency in intercepting aeration bubbles and cannot adapt to different aeration intensity fluctuations, further deteriorating the three-phase separation effect.

[0004] A search revealed that Chinese patent application 201610670039.3, with a publication date of December 7, 2016, discloses an aerobic three-phase separator and its application method in wastewater treatment. The aerobic three-phase separator includes two parallel end plates integrally formed from a bottom inverted trapezoidal plate and a top rectangular plate; a guide plate with a rectangular cavity at the top, perpendicularly connected to the two sides of the two end plates; an inclined plate with a bottom conical cavity having sludge return slits, the bottom ends of the two guide plates being folded inward and perpendicularly connected to the two sides of the bottom inverted trapezoidal plate of the end plates; an overflow weir located between the two end plates on the horizontal axis of the top rectangular cavity; a drain pipe disposed between the bottom of the overflow weir and the inclined plate; symmetrically arranged sedimentation baffles extending downward from the top of the two end plates between the overflow weir and the guide plates on both sides of the overflow weir; a sludge sedimentation zone formed between the sedimentation baffles; a guide zone formed between the sedimentation baffles and the guide plates; and a conical sludge hopper surrounded by the inclined plate and the two end plates. The sides of the guide plates are provided with several first through holes. However, on the one hand, this influent flow rate relies on the first through-hole, making it difficult to cope with fluctuations in influent volume and quality; on the other hand, when placed directly in the aeration tank, its separation effect, especially the ability of the baffle plate to prevent air bubbles from entering the sedimentation zone, largely depends on the size and uniformity of the bubbles generated by the aeration system. If the aeration is uneven or large bubbles are generated, it may disrupt the flow pattern in the sedimentation zone, causing the bubbles to carry sludge to the surface and affecting the clarity of the effluent.

[0005] Further investigation revealed several technical barriers: Firstly, the control of circulating backflow needs to be achieved by dynamically adjusting the flow rate. However, the adjustment of the flow rate involves multiple dimensions such as vertical, horizontal, or oblique adjustment. The relationship between the adjustment direction and the flow rate is dynamically affected by the liquid level and aeration intensity, making it difficult to establish a stable control model. Secondly, the accurate determination of the final circulation ratio R requires coupling multiple dynamic variables—different influent volumes and influent water quality (COD, ammonia nitrogen, suspended solids concentration, etc.) correspond to different aeration requirements, while the sludge-water density in the aerobic tank changes dynamically with sludge concentration and viscosity. The real-time fluctuations of the above variables cause the optimal value of the circulation ratio R to always be in a state of dynamic adjustment, which cannot be adapted by traditional fixed parameter control methods. Third, the quantitative relationship between orifice adjustment amount H (or flow rate adjustment range) and circulating water volume is affected by multiple coupled factors: the nonlinear effect of orifice change on local resistance, the dynamic interference of sludge concentration and viscosity on flow characteristics, and the hydraulic disturbance caused by aeration, all of which will disrupt the linear correspondence between orifice size and flow rate. Traditional empirical formulas or simplified models are difficult to accurately describe this dynamic process of multivariate coupling, resulting in the inability to accurately quantify the adjustment amount, and thus the inability to achieve precise control of the circulation ratio R.

[0006] Therefore, in order to achieve precise adjustment of the circulation ratio and enhance the wastewater treatment effect, there is an urgent need for aerobic three-phase separation reactors, water treatment systems and their circulation ratio adjustment methods. Summary of the Invention

[0007] 1. The problem to be solved One of the objectives of this invention is to provide an aerobic three-phase separation reactor, which, through structural design, aims to regulate its influent flow rate.

[0008] Another objective of this invention is to provide a water treatment system that enables precise adjustment of the circulation ratio of the water treatment system, and further to provide a method for adjusting the circulation ratio.

[0009] 2. Technical Solution To solve the above problems, the technical solution adopted by the present invention is as follows: A first aspect of the present invention provides an aerobic three-phase separation reactor, comprising: The water guiding zone is a sandwich space formed by the outer tank and the inner tank. The inner tank is placed inside the outer tank, and the lower end of the inner tank is connected to the outer tank. Several water inlets are opened on the outer tank corresponding to the water guiding zone. A reflux regulator is installed above the water inlet to adjust the water flow rate of the water inlet. The water distribution and energy dissipation zone is located in the inner tank and is connected to the water guiding zone. The clarification zone, located in the inner tank and above the water distribution and energy dissipation zone, is used to separate sludge and clean water. The clear water zone is located in the inner tank and above the clarification zone. It is equipped with a water outlet weir. A water outlet is opened at the junction of the water outlet weir and the outer tank. The clear water is guided from the water outlet weir to the water outlet and discharged. The sludge hopper area is located inside the outer tank and below the water distribution and energy dissipation area; it is used to discharge sludge to the outlet at the bottom of the outer tank.

[0010] As one possible implementation, the backflow regulator includes a motor, a rotating shaft, a gear, a rack, and a baffle plate. One end of the rotating shaft is connected to the motor, and the opposite end of the rotating shaft is fitted with a gear. The rack is fixed on the baffle plate. The gear and rack are connected by a transmission. The motor powers the gear to rotate, and the gear and rack work together to move the baffle plate up and down, thereby regulating the inlet flow rate.

[0011] As one possible implementation, the outer tank is provided with at least one pair of limiting members to limit the displacement of the baffle in the horizontal direction.

[0012] As one possible implementation, the plurality of water inlets are arranged horizontally side by side, and the water inlets are triangular holes, square holes, circular holes or other shapes of holes.

[0013] As one possible implementation, the inlet is preferably an inverted triangular hole, which has the following advantages: ①The core advantage of the inverted triangular inlet is that the flow area increases non-linearly with the increase of water head, which means that when the water level rises, the flow rate increases faster than that of a circular or square orifice. ② Less prone to clogging: The top of the V-shape is usually wider, making it less likely to be completely clogged by floating leaves, branches and other debris compared to small-diameter round holes; ③Structural stability: The triangular structure itself has good mechanical stability, which is beneficial to the strength of the orifice itself.

[0014] As one possible implementation, a ring of energy-dissipating air guide plates is provided at the bottom of the inner tank. The orientation of the energy-dissipating air guide plates is the same as the orientation of the outer tank corresponding to the sludge hopper area, or the angle between the energy-dissipating air guide plates and the horizontal plane is smaller than the angle between the outer tank corresponding to the sludge hopper area and the horizontal plane. Preferably, the length of the energy-dissipating air guide plates is 1 / 5 to 1 / 2 of the length of the outer tank corresponding to the sludge hopper area. If the energy-dissipating air guide plates are too long, they will disturb the sludge at the bottom, and air bubbles will appear in the water guiding area. If the energy-dissipating air guide plates are too short, the air bubbles in the water guiding area will impact the sludge, affecting the separation effect.

[0015] As one possible implementation, a secondary sedimentation and distribution zone for sludge is also included between the primary baffle plate and the secondary baffle plate: the primary baffle plate and the secondary baffle plate are fixedly connected to the inner wall of the outer tank; the primary baffle plate is set above the bottom outlet of the outer tank, and the secondary baffle plate is set at the bottom outlet of the outer tank to form a composite separation structure; wherein, the cross-section of the primary baffle plate and the secondary baffle plate is a V-shape or arc shape with the opening facing downward.

[0016] As one possible implementation, a primary vent is provided at the connection between the primary baffle and the outer tank; a secondary vent is provided at the connection between the secondary baffle and the outer tank. Both vents are used for gas release.

[0017] As one possible implementation, an inclined tube or plate is installed in the clarification zone, with an inclination angle of 30~60° relative to the horizontal plane.

[0018] A second aspect of the present invention provides a water treatment system comprising an aerobic tank and one or more of the above-described aerobic three-phase separation reactors arranged within the aerobic tank.

[0019] A third aspect of the present invention provides a method for adjusting the circulation ratio of the above-mentioned water treatment system, comprising the following steps: S1. Determine the required circulation ratio R and calculate the required inlet flow rate nQ1 in the aerobic three-phase separator: ; In the formula, N is the number of aerobic three-phase separators, n is the number of inlet orifices of a single aerobic three-phase separator, Q1 is the calculated flow rate of a single circulation orifice, and Q... out To calculate the total effluent flow rate of all aerobic three-phase separators, Q li This refers to the influent flow rate of wastewater into the aerobic tank. S2. The required height Δh for raising the liquid level in the aerobic tank before and after aeration under different influent flow rates and water quality conditions:

[0020] In the formula: P atm For different regions, g represents the pressure parameter; g is the acceleration due to gravity; ρ represents the acceleration due to gravity. li To measure the density of wastewater in the aerobic tank; Q g Q is the required aeration gas flow rate to be adjusted in the aerobic tank. li This refers to the influent flow rate of wastewater into the aerobic tank. S3. Based on the required influent flow rate nQ1 in step S1 and the required height Δh of the liquid level rise in the aerobic tank before and after aeration in step S2, determine the positional relationship between the following three parameters: the height H of the bottom of the three-phase separator inlet from the bottom of the aerobic tank, the height h1 of the effluent surface in the three-phase separator from the bottom of the aerobic tank, and the height h2 of the three-phase separator inlet after flow adjustment. Option 1: When H < h1 + Δh < H + h2, and h1 < H, then Q1 under different influent flow rates and different aeration rates is: ; In the formula: μ1 is the free outflow coefficient of the inlet (related to water quality, which can be directly obtained with existing technology, and the empirical value range of μ1 is 0.62~0.85), a is the minimum vertical distance from the lower edge of the inlet to the liquid level, and x (y) is the vertical distance from each point on the lower edge of the inlet to the water surface of the inlet. Option 2: When H + h2 < h1 + Δh and H < h1 < H + h2, then Q1 under different influent flow rates and different aeration rates is:

[0021] In the formula: b1 is the minimum vertical distance (≥0) from the upper edge of the inlet to the outlet liquid level, b2 is the minimum vertical distance (≥0) from the lower edge of the orifice to the outlet liquid level, x1 (y1) is the vertical distance from each point on the upper edge of the inlet to the outlet liquid surface in the three-phase separator, x2 (y2) is the vertical distance from each point on the lower edge of the inlet to the outlet liquid surface in the three-phase separator, μ2 is the submerged outflow coefficient, and μ2 is less than μ1. The empirical value range of μ2 is 0.6~0.7.

[0022] As one possible implementation, assuming the inlet is not blocked by the baffle, i.e., its opening shape is an inverted triangular hole, And when the water inflow situation is H+h2 li When increasing, while ensuring Q out =Q li To ensure that the cycle ratio R remains constant, based on the assumed conditions, we can obtain... ; Q c Q can be determined by the influent flow rate of all aerobic matrix three-phase separators. c If Q1 needs to be increased, then the water flow area needs to be increased, which means increasing the height of the precision reflux regulator.

[0023] get ; When H+h2 ; The height of the inverted triangular opening is h3, the geometric base length is L, h2 is the height of the water passage before adjustment, and the lifting height of the precision backflow regulator is d. Therefore, combining the above, the calculation of the lifting height d of the baffle plate in the backflow regulator is as follows:​​

[0024] 3. Beneficial effects Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The three-phase separator of the present invention is an innovative aerobic three-phase separator based on a multi-dimensional adjustable structure and dynamic circulation ratio R coupled control—simultaneously achieving efficient three-phase separation and precise control of circulation reflux: ① Innovative structure of multi-dimensional adjustable precision reflux regulator Breaking away from the traditional fixed orifice / weir design, the recirculation regulator at the circulating inlet uses threaded drive to flexibly change the flow cross section and weir height. Compared with the traditional single-direction regulation, it can adapt to complex flow fields, providing a "quantifiable and adaptable" basis for precise control of the circulation ratio, and solving the defects of traditional regulation that only roughly controls the quantity and is difficult to match dynamic flow fields. ②Innovation of the Coupling Control Method for Dynamic Cyclic Ratio R To address the challenges of dynamic changes in influent flow, water quality, aeration rate, and sludge density, a multi-variable coupled circulation ratio R control logic is established. This logic uses multiple variables (water quality, influent flow, aeration rate, sludge density, and liquid level) as the core, breaking through the traditional single-variable mode. Through multi-dimensional adjustment by the regulator, a closed-loop control of "dynamic variable - regulator action - circulation ratio R" is established, overcoming the problems of poor adaptability and lag in traditional fixed parameter control. This ensures that the circulation ratio R is always optimal, rather than relying on rough adjustment.

[0025] ③Innovation in precise adaptation and performance assurance across multiple scenarios Based on the above innovations, the core solution addresses problems in multiple scenarios by focusing on "precise control of the cycle ratio R": At low flow rates, adjust the regulator height to restore the circulation ratio and prevent mud and water from flowing backwards. At high flow rates, the height limit circulation ratio is lowered to reduce sludge disturbance; when there are installation errors, the parameters of each inlet are independently adjusted to calibrate the local circulation ratio, ensuring water balance, compensating for errors, and avoiding local imbalances caused by traditional overall regulation.

[0026] (2) In the three-phase separation reactor, the inner energy-dissipating gas guide plate of the present invention is extended, thereby constructing an extended uniform water distribution channel, which brings about many technical improvements: ① Reduced flow velocity and uniform water distribution: The extended inner energy-dissipating air guide plate effectively increases the water flow path and slows down the water flow velocity, making the influent more evenly dispersed during the water distribution process. This avoids the impact of excessively fast local water flow on the sedimentation effect, creates stable hydraulic conditions for the subsequent sedimentation process, improves the overall water distribution uniformity, and enhances the reactor's adaptability to different influent flow rates.

[0027] ② Baffle and Gas Release: The baffle formed by the energy-dissipating air guide plate not only extends the water path, but more importantly, it promotes the gradual release of gas carried in the influent within the evenly distributed water channel. This design effectively prevents gas from directly entering the inclined tube or sludge hopper inclined plate sedimentation zone, reduces water flow disturbance caused by gas rising, ensures that the sludge-water separation process in the sedimentation zone is undisturbed, and significantly improves sedimentation efficiency and effluent quality.

[0028] ③ Optimized sedimentation effect: The carefully designed extended inner energy-dissipating air guide plate, with a length of 1 / 5 to 1 / 2, avoids insufficient water distribution and flow stabilization due to being too short, while also preventing erosion and damage to the sedimentation zone and bottom sediment caused by excessive length in the inclined tube or mud hopper. By precisely controlling the length of the energy-dissipating air guide plate, the sedimentation effect is optimized. While ensuring uniform water distribution, the negative impact on the sedimentation process is minimized, improving the overall performance of the reactor.

[0029] (3) In this invention, double baffles are installed on both sides of the sludge outlet of the aerobic sedimentation device, providing double protection for the sedimentation process: ② Enhanced primary baffle plate in the upper layer: The primary baffle plate enhances the protection of the sedimentation zone, intercepting a small amount of entrained gas that may enter due to water flow fluctuations or the failure of the secondary baffle plate at the bottom layer to completely block it, and discharging it through the top release port. This further reduces the disturbance of gas to the sedimented sludge, ensures that the sedimentation process is not disturbed by gas, improves the reliability of the sedimentation effect, reduces the loss of sedimented sludge, and improves the overall operating efficiency of the reactor. ① Bottom-level secondary air baffle protection: The bottom secondary air baffle effectively prevents gas generated during aeration from entering the sedimentation zone, avoiding disturbance of the settled sludge by aeration and air entrapment in the tank. Under aeration conditions, this secondary air baffle effectively reduces the impact of gas on the settled sludge, maintains a stable environment in the sedimentation zone, reduces the risk of sludge floating, improves sedimentation efficiency, and ensures the stability of effluent quality. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the aerobic three-phase separation reactor of the present invention.

[0031] Figure 2 This is a front view of the aerobic three-phase separation reactor of the present invention.

[0032] Figure 3 for Figure 2 A magnified view of a portion of region A in the middle.

[0033] Figure 4 for Figure 3 A magnified view of a portion of region B in the middle.

[0034] Figure 5This is a perspective view of the aerobic three-phase separation reactor of the present invention.

[0035] Figure 6 This is a first cross-sectional view of the water treatment system of the present invention.

[0036] Figure 7 This is a second cross-sectional view of the water treatment system of the present invention.

[0037] In the picture: 1. Water guiding zone; 11. Outer tank; 111. Inlet; 12. Inner tank; 121. Energy dissipation air guide plate; 13. Return flow regulator; 131. Motor; 132. Rotating shaft; 133. Gear; 134. Rack; 135. Baffle plate; 136. Limiting component; 2. Water distribution and energy dissipation zone; 3. Clarification zone; 4. Clear water zone; 41. Effluent weir; 42. Effluent outlet; 5. Sludge hopper zone; 6. Secondary sludge sedimentation and distribution zone; 61. Primary air baffle plate; 611. Primary vent; 62. Secondary air baffle plate; 621. Secondary vent; 7. Aerobic tank. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments.

[0039] Example 1 like Figure 1 As shown in the figure, this embodiment provides a cross-sectional view of an aerobic three-phase separation reactor, including a water guiding zone 1, a water distribution and energy dissipation zone 2, a clarification zone 3, a clear water zone 4, a sludge hopper zone 5, and: Water guiding zone 1 is a sandwich space formed by the outer tank 11 and the inner tank 12. The inner tank 12 is placed inside the outer tank 11, and the lower end of the inner tank 12 is connected to the outer tank 11. Several water inlets 111 are opened on the outer tank 11 corresponding to water guiding zone 1. The water inlets 111 are arranged horizontally side by side. The water inlets 111 are triangular holes, square holes, circular holes or other shapes of holes. In this embodiment, the water inlets 111 are set as inverted triangular holes.

[0040] like Figure 2 As shown, a backflow regulator 13 is installed above the inlet 111 to regulate the inlet flow rate of the inlet 111: Figure 3 , 4As shown, the reflux regulator 13 includes a motor 131, a rotating shaft 132, a gear 133, a rack 134, and a baffle plate 135. One end of the rotating shaft 132 is connected to the motor 131, and the opposite end of the rotating shaft 132 is fitted with the gear 133. The rack 134 is welded to the baffle plate 135. The gear 133 and the rack 134 are connected in a transmission manner. The motor 131 supplies power to make the gear 133 rotate, and the gear 133 and the rack 134 cooperate to drive the baffle plate 135 to move up and down, thereby regulating the inlet flow rate of the water inlet 111. In order to limit the horizontal displacement of the baffle plate 135, a pair of limiting members 136 are set at both ends of the baffle plate 135 corresponding to the positions on the outer tank 11.

[0041] A ring of energy-dissipating air guide plates 121 is provided at the bottom of the inner tank 12. The orientation of the energy-dissipating air guide plates 121 is consistent with the orientation of the outer tank corresponding to the sludge hopper area 5. In this embodiment, the length of the energy-dissipating air guide plates 121 is 1 / 2 of the length of the outer tank corresponding to the sludge hopper area 5.

[0042] Water distribution and energy dissipation zone 2 is located inside inner tank 12 and is connected to water guiding zone 1.

[0043] Clarification zone 3, located inside inner tank 12 and above water distribution and energy dissipation zone 2, is used to separate sludge and clean water. Inclined tubes or plates are installed in clarification zone 3, with an inclination angle of 30~60° relative to the horizontal plane. In this embodiment, it is set at 45° to prolong the retention time of sewage and enhance the sludge separation effect.

[0044] Clear water zone 4, located inside inner tank 12 and above clarification zone 3, is equipped with an outlet weir 41, such as... Figure 5 As shown, an outlet 42 is opened at the junction of the outlet weir 41 and the outer tank 11, and clean water is guided from the outlet weir 41 to the outlet 42 and discharged.

[0045] The sludge hopper area 5 is located inside the outer tank 11 and below the water distribution and energy dissipation area 2; it is used to discharge sludge to the outlet at the bottom of the outer tank 11.

[0046] The secondary sedimentation and distribution zone 6 for sludge is located between the primary air baffle 61 and the secondary air baffle 62. The primary air baffle 61 and the secondary air baffle 62 are fixedly connected to the inner wall of the outer tank 11. The cross-sections of the primary air baffle 61 and the secondary air baffle 62 are V-shaped or arc-shaped with the opening facing downwards, forming a composite separation structure to prevent aeration from the aerobic tank from entering the three-phase separator and disrupting the sludge settling effect. A primary baffle plate 61 is located above the bottom outlet of the outer tank 11, and a primary vent 611 is opened at the connection with the outer tank 11; The secondary baffle plate 62 is located at the bottom outlet of the outer tank 11, and a secondary vent 621 is opened at the connection between the baffle plate and the outer tank 11.

[0047] The water treatment system of this embodiment includes an aerobic tank 7 and N aerobic three-phase separation reactors arranged within the aerobic tank 7. Wastewater in the aerobic tank 7 enters the guide zone 1 of the three-phase separator through the inlet 111. Passing through the extended energy-dissipating air guide plate 121, the wastewater enters the water distribution and energy dissipation zone 2, while some wastewater mixed with sludge floats to the clarification zone 3. Under the separation and sedimentation effect in the clarification zone 3, the clear water floats to the clear water zone 4, and the clear water zone 4 reaches the effluent level, which is then discharged into the effluent weir 41 and discharged through the effluent outlet 42; while the sludge in the clarification zone 3 settles down to the sludge hopper zone 5.

[0048] The sludge hopper 5 is funnel-shaped, and the sludge is discharged from the bottom of the outer tank 11 to the aerobic tank 7.

[0049] To reduce the aeration in the aerobic tank 7 and prevent sludge from returning from the bottom outlet of the three-phase separator to the outer tank 11, the combined action of the primary baffle plate 61 and the secondary baffle plate 62 ensures that the sludge will almost never re-enter the three-phase separator, thus increasing the separation effect.

[0050] Example 2 This embodiment describes the method for adjusting the circulation ratio of the water treatment system in Embodiment 1. The steps are as follows: S1. Determine the required circulation ratio R, and calculate the required inlet flow rate nQ1 at inlet 111 of the aerobic three-phase separator: ; In the formula, N is the number of aerobic three-phase separators, n is the number of inlet orifices of a single aerobic three-phase separator, Q1 is the calculated flow rate of a single circulation orifice, and Q... out To calculate the total effluent flow rate of all aerobic three-phase separators, Q li The influent flow rate of wastewater in aerobic tank 7; S2. The required height Δh for raising the liquid level in the aerobic tank 7 before and after aeration under different influent flow rates and water quality conditions:

[0051] In the formula: P atm For different regions, g represents the pressure parameter; g is the acceleration due to gravity; ρ represents the acceleration due to gravity. li To measure the density of wastewater in the aerobic tank; Q g Q is the required aeration gas flow rate to be adjusted in the aerobic tank. li The influent flow rate of wastewater in aerobic tank 7; S3. Based on the required influent flow rate nQ1 in step S1 and the required height Δh of the liquid level rise in the aerobic tank 7 before and after aeration in step S2, determine the positional relationship between the following three parameters: the height H of the bottom of the three-phase separator inlet 111 from the bottom of the aerobic tank, the height h1 of the effluent surface in the three-phase separator from the bottom of the aerobic tank, and the height h2 of the three-phase separator inlet after flow adjustment. Option 1: As Figure 6 The diagram shows the parameters when the air-lift liquid level does not exceed the top of the inlet. That is, when H < h1 + Δh < H + h2, and h1 < H, Q1 under different inlet flow rates and different aeration rates is: ; In the formula: μ1 is the free outflow coefficient of inlet 111, μ1 is 0.62~0.85, a is the minimum vertical distance from the lower edge of inlet 111 to the liquid level, and x (y) is the curve formula of the vertical distance from each point on the lower edge of inlet 111 to the water surface of the inlet. Option 2: Figure 7 The diagram shows the parameters for the air-lift liquid level submerging the top of the inlet. Specifically, when H + h2 < h1 + Δh and H < h1 < H + h2, Q1 under different inlet flow rates and aeration rates is:

[0052] In the formula: b1 is the minimum vertical distance (≥0) from the upper edge of the inlet 111 to the outlet liquid level, b2 is the minimum vertical distance (≥0) from the lower edge of the orifice to the outlet liquid level, x1 (y1) is the curve formula of the vertical distance from each point on the upper edge of the inlet to the outlet liquid surface in the three-phase separator, x2 (y2) is the curve formula of the vertical distance from each point on the lower edge of the inlet to the outlet liquid surface in the three-phase separator, μ2 is the submerged outflow coefficient, and μ2 is less than μ1, μ2 is 0.6~0.7.

[0053] In this embodiment, when the inlet is not blocked by the baffle plate, the shape of its opening is an inverted triangular hole. And when the water inflow situation is H+h2 li When increasing, while ensuring Q out =Q li To ensure that the cycle ratio R remains constant, based on the assumed conditions, we can obtain... ; Q c Q can be determined by the influent flow rate of all aerobic matrix three-phase separators. c If Q1 needs to be increased, then the water flow area needs to be increased, which means increasing the height of the precision reflux regulator.

[0054] get ; When H+h2 ; ​​The geometric height of the inverted triangular hole is h3, the geometric base length is L, h2 is the height of the water passage hole before adjustment, and the lifting height of the precision backflow regulator is d. An empirical coefficient k is introduced, with a range of 0.01 to 0.06. Therefore, the calculation of the lifting height d of the baffle 135 in the backflow regulator is as follows:

[0055] Table 1 shows the relevant data for adjusting the cycle ratio in three sets of this embodiment.

[0056] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. Aerobic three-phase separation reactor, characterized in that: The utility model relates to a sewage treatment device, which comprises: a water guide area (1) formed by a sandwiched space of an outer tank (11) and an inner tank (12), wherein the inner tank (12) is arranged in the outer tank (11), and the lower end of the inner tank (12) is communicated with the outer tank (11); a plurality of water inlets (111) are arranged on the outer tank (11) corresponding to the water guide area (1), and a reflux regulator (13) is arranged above the water inlets (111) to adjust the water inflow of the water inlets (111); a water distribution and energy dissipation area (2) arranged in the inner tank (12) and communicated with the water guide area (1); a clarification area (3) arranged in the inner tank (12) and above the water distribution and energy dissipation area (2) to separate sludge and clean water; a clean water area (4) arranged in the inner tank (12) and above the clarification area (3), and provided with a water outlet weir (41); a water outlet (42) is arranged at the joint of the water outlet weir (41) and the outer tank (11), and the clean water is guided to the water outlet (42) by the water outlet weir (41) and discharged; a sludge hopper area (5) arranged in the outer tank (11) and below the water distribution and energy dissipation area (2) to discharge sludge to the outlet at the bottom of the outer tank (11).

2. The aerobic three-phase separation reactor according to claim 1, characterized in that: The reflux regulator (13) comprises a motor (131), a rotating shaft (132), a gear (133), a rack (134) and a flow baffle (135); one end of the rotating shaft (132) is connected with the motor (131), the other end of the rotating shaft (132) is sleeved with the gear (133), and the rack (134) is fixed on the flow baffle (135); the gear (133) and the rack (134) are in transmission connection; the motor (131) is powered to drive the gear (133) to rotate, and the gear (133) and the rack (134) cooperate to drive the flow baffle (135) to move up and down, thereby adjusting the water inflow of the water inlets (111).

3. The aerobic three-phase separation reactor according to claim 1, characterized in that: The plurality of water inlets (111) are arranged horizontally and side by side; the water inlets (111) are triangular holes, square holes, circular holes or other shaped holes, preferably inverted triangular holes.

4. The aerobic three-phase separation reactor according to claim 1, characterized in that: A circle of energy dissipation air guide plates (121) is arranged at the bottom of the inner tank (12); the direction of the energy dissipation air guide plates (121) is consistent with the direction of the outer tank corresponding to the sludge hopper area (5), or the included angle between the energy dissipation air guide plates (121) and the horizontal plane is smaller than the included angle between the outer tank corresponding to the sludge hopper area (5) and the horizontal plane; preferably, the length of the energy dissipation air guide plates (121) is 1 / 5-1 / 2 of the length of the outer tank corresponding to the sludge hopper area (5).

5. The aerobic three-phase separation reactor according to claim 1, characterized in that: The inner wall of the outer tank (11) is fixedly connected with a first gas baffle (61) and a second gas baffle (62); the first gas baffle (61) is arranged above the outlet at the bottom of the outer tank (11), and the second gas baffle (62) is arranged at the outlet at the bottom of the outer tank (11); the cross section of the first gas baffle (61) and the second gas baffle (62) is V-shaped or arc-shaped with the opening downward.

6. The aerobic three-phase separation reactor according to claim 5, characterized in that: A first gas escape hole (611) is arranged at the joint of the first gas baffle (61) and the outer tank (11); a second gas escape hole (621) is arranged at the joint of the second gas baffle (62) and the outer tank (11).

7. The aerobic three-phase separation reactor according to any one of claims 1 to 6, characterized in that: An inclined pipe or an inclined plate is arranged in the clarification area (3).

8. A water treatment system characterised by: The aerobic tank (7) and one or more aerobic three-phase separation reactors according to any one of claims 1-7 arranged in the aerobic tank (7).

9. The method of claim 8, wherein the ratio of the circulation of the water treatment system is adjusted by: The steps are: S1, determining the required circulation ratio R, and calculating the required water inflow nQ1 of the water inlet (111) in the aerobic three-phase separator; S2, adjusting the height Δh of the liquid level in the aerobic tank (7) before and after aeration under different water inflow and water quality conditions: wherein: P atm is the pressure parameter for different regions; g is the acceleration of gravity; p li is the density of the wastewater measured in the aerobic tank; Q g is the required aeration gas flow rate adjusted in the aerobic tank; Q li is the influent flow rate of the wastewater in the aerobic tank (7); S3, determining the position relationship among the height H of the bottom end of the water inlet (111) of the three-phase separator from the bottom of the aerobic tank, the height h1 of the water outlet liquid surface in the three-phase separator from the bottom of the aerobic tank, and the height h2 of the water inlet (111) of the three-phase separator after adjusting the flow rate according to the required water inflow nQ1 of the water inlet (111) in step S1 and the height Δh of the liquid level in the aerobic tank (7) before and after aeration in step S2: Scheme one: when H < h1 + Δh < H + h2, and h1 < H, then Q1 under different water inflow and aeration conditions is: ； In the formula, μ1 is the free outflow flow coefficient of the water inlet (111), a is the minimum vertical distance from the lower edge of the water inlet (111) to the liquid level, and x (y) is the vertical distance from each point of the lower edge of the water inlet (111) to the water outlet liquid surface of the water inlet (111); Scheme two: when H + h2 < h1 + Δh, and H < h1 < H + h2, then Q1 under different water inflow and aeration conditions is: In the formula, b1 is the minimum vertical distance from the upper edge of the water inlet (111) to the water outlet liquid level (≥0), b2 is the minimum vertical distance from the lower edge of the orifice to the water outlet liquid level (≥0), x1 (y1) is the vertical distance from each point of the upper edge of the water inlet (111) to the water outlet liquid surface in the three-phase separator, x2 (y2) is the vertical distance from each point of the lower edge of the water inlet (111) to the water outlet liquid surface in the three-phase separator, μ2 is the submerged outflow flow coefficient, and μ2 is less than μ1.

10. The method of claim 9, wherein: When the water inlet (111) is not blocked by the baffle (135), it is a reverse triangular hole, and H + h2 < h1 + Δh, H < h1 < H + h2, the lifting height d of the baffle (135) in the backflow regulator (13) is: In the formula, k is a coefficient, h3 is the height of the reverse triangular hole, and L is the geometric base length of the water inlet (111).

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