A sand removal system for hydrolysis acidification tank

Abstract

This invention relates to a sand removal system for a hydrolysis acidification tank, comprising a water distribution component, a sand settling component, a sand scraping component, and a sand discharge component. The sand settling component is installed inside the hydrolysis acidification tank to form a sand settling zone. The water distribution component is positioned above the sand settling component, and multiple scraper blades of the sand scraping component are evenly distributed in the sand settling zone. The sand discharge component is positioned below the sand settling zone and is connected to the sand discharge port of the sand settling zone. The inlet of the water distribution component is connected to a sewage pipe, allowing sewage to be evenly discharged into the sand settling zone. The scraper blades scrape the sludge and sand from the sand settling zone to the sand discharge port, where they enter the sand discharge component, which then discharges the sludge and sand from the hydrolysis acidification tank. The beneficial effects are that the water distribution component, sand settling component, sand scraping component, and sand discharge component form a complete sand removal chain, and the synergistic effect of each component significantly improves the sand removal effect. Moreover, the system has a simple structure, is easy to install and maintain, has low operating costs, and offers good economic and environmental benefits.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a sand removal system for a hydrolysis acidification tank. Background Technology

[0002] Currently, hydrolysis acidification tanks are crucial treatment units in wastewater treatment processes. Their function is to decompose large organic molecules in wastewater into smaller ones, improving the wastewater's biodegradability. However, wastewater typically contains a certain amount of impurities such as silt and sand. If these silt and sand accumulate excessively in the hydrolysis acidification tank, several problems arise. On one hand, silt and sand occupy the effective volume of the tank, reducing its treatment capacity. On the other hand, excessive silt and sand negatively impact the living environment and metabolic activities of microorganisms within the tank, thus reducing the efficiency and effectiveness of hydrolysis acidification. Traditional sand removal methods in hydrolysis acidification tanks have some shortcomings, such as incomplete sand removal, resulting in significant silt and sand residue; or the sand removal process is complex, requiring substantial manpower, material resources, and time, thus affecting the overall operational efficiency and economic viability of the wastewater treatment system. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a sand removal system for a hydrolysis acidification tank, which solves the technical problems of poor sand removal effect and complex sand removal process affecting the efficiency of sewage treatment in the prior art.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0007] This invention provides a sand removal system for a hydrolysis acidification tank, comprising a water distribution component, a sand settling component, a sand scraping component, and a sand discharge component. The sand settling component is installed inside the hydrolysis acidification tank to form a sand settling zone. The water distribution component is positioned above the sand settling component, and multiple sand scraping plates of the sand scraping component are evenly distributed in the sand settling zone. The sand discharge component is positioned below the sand settling zone and is connected to the sand discharge port of the sand settling zone. The inlet of the water distribution component is connected to a sewage pipe, and the water distribution component can evenly discharge sewage into the sand settling zone. The sand scraping plates scrape the sludge and sand in the sand settling zone to the sand discharge port and enter the sand discharge component, which then discharges the sludge and sand from the hydrolysis acidification tank.

[0008] Optionally, the water distribution assembly includes a circular inlet pipe and multiple water distribution branch pipes; the inlet of the circular inlet pipe is connected to a sewage pipe; both ends of the water distribution branch pipes are connected to the circular inlet pipe and the sand scraping drive mechanism of the sand scraping assembly, and the multiple water distribution branch pipes are evenly distributed in a wheel spoke shape between the circular inlet pipe and the sand scraping drive mechanism; multiple water outlets are evenly opened at the bottom of the water distribution branch pipes along their length.

[0009] Optionally, the diameter of the water distribution branch pipe gradually decreases along the water flow direction, and the diameter ratio of the first end to the last end of the water distribution branch pipe is 1.2 to 1.5:1.

[0010] Optionally, the outlet is a slit structure, with its length direction forming an angle of 50°~60° with the axis of the water distribution branch pipe. The width of the outlet is 5~8mm, and the distance between adjacent outlets is d satisfying d=0.8vt, where v is the design flow velocity and t is the sand settling time threshold.

[0011] Optionally, the grit settling assembly includes multiple grit settling plates; the multiple grit settling plates are arranged circumferentially along the hydrolysis acidification tank to form an inverted frustum-shaped grit settling zone; the outer side of the grit settling plate has an angle of 25° to 35° with the horizontal plane.

[0012] Optionally, the sand discharge assembly includes a sand collection hopper, a sand discharge valve, and a sand discharge pipe; the sand inlet of the sand discharge pipe is connected to the sand discharge outlet of the settling area through the sand collection hopper, and the sand discharge valve is located at the connection between the sand discharge pipe and the sand collection hopper.

[0013] Optionally, the sand removal system also includes a controller and a data acquisition component; the signal output terminal of the data acquisition component is connected to the signal input terminal of the controller; the signal output terminal of the controller is connected to the water distribution component, the sand scraping component, and the sand discharge component; the data acquisition component includes a sedimentation monitor and a sand quantity monitor; the sedimentation monitor is installed on the sedimentation component, and the sand quantity monitor is installed on the sand discharge component.

[0014] Optionally, the controller dynamically adjusts the scraping frequency f based on the sand quantity signal fed back from the sand quantity monitor, satisfying the following:

[0015] .

[0016] Where K is the proportionality coefficient, ranging from 0.8 to 1.2, and W... t W0 represents the real-time sand volume, while W0 represents the baseline sand volume.

[0017] Optionally, the controller adjusts the flow rate of the water distribution components proportionally based on the difference between the real-time sediment volume data and a preset threshold to satisfy:

[0018] .

[0019] Among them, Q 实际 Q represents the real-time flow rate of the water distribution component. 设计 α is the initial design flow rate; α is the flow rate attenuation coefficient, with a value range of 0.1~0.3; S is the amount of sediment monitored in real time in the sedimentation zone; S0 is the design threshold for sediment volume.

[0020] Optionally, when the sedimentation rate S > S0, the controller synchronously reduces the flow rate of the water distribution component and adjusts the sand scraping component, ensuring the sand scraper speed meets the following requirements:

[0021] .

[0022] Where n is the real-time rotational speed of the scraper blade; n0 is the reference rotational speed of the scraper blade; and β is the scraper blade compensation coefficient, with a value range of 0.2 to 0.4.

[0023] (III) Beneficial Effects

[0024] The beneficial effects of this invention are:

[0025] This invention provides a sand removal system for a hydrolysis acidification tank. A water distribution component is positioned above a sand settling component, ensuring uniform coverage of the sand settling zone by wastewater. This creates a stable flow field for subsequent sand settling, facilitating sand particle settling and avoiding short-circuiting and eddy current problems associated with traditional single-point water distribution. It also improves the uniformity of water flow velocity in the sand settling zone, reduces sedimentation blind spots within the tank, and increases sand settling efficiency. The sand settling component forms an independent sand settling zone within the hydrolysis acidification tank, increasing the sand particle settling area and utilizing density differences to achieve efficient separation of sand particles from the water phase. Multiple scraper blades are evenly distributed within the sand settling zone, adhering to the tank bottom and the surface of the sand settling zone, directionally scraping the settled sand particles to the sand discharge port of the sand settling zone, resulting in high sand removal efficiency. The sand discharge component connects to the sand discharge port of the sand settling zone, utilizing the gravity of the sand particles to achieve powerless or low-power discharge. Compared to existing technologies, its water distribution component, grit settling component, grit scraping component, and grit discharge component form a complete grit removal chain. The components work together to achieve uniform water distribution, efficient grit settling, thorough grit scraping, and precise grit discharge, significantly improving the grit removal effect, reducing the impact of silt on microorganisms in the hydrolysis acidification tank, and enhancing the hydrolysis acidification effect. This, in turn, improves the treatment capacity and effluent quality of the wastewater treatment system. Moreover, it has a simple structure, is easy to install and maintain, has low operating costs, and offers good economic and environmental benefits. It can be widely used in wastewater treatment plants and industrial wastewater treatment fields of various sizes. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a hydrolysis acidification tank sand removal system according to Embodiment 1 of the present invention;

[0027] Figure 2 This is a top view of the structure of a sedimentation zone and scraper assembly according to Embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the water distribution assembly according to Embodiment 1 of the present invention;

[0029] Figure 4 This is a schematic diagram of the water distribution branch pipe according to Embodiment 1 of the present invention;

[0030] Figure 5 This is a connection diagram of the controller in Embodiment 1 of the present invention.

[0031] [Explanation of Labels in the Attached Image]

[0032] 1: Hydrolysis acidification tank; 2: Settling zone; 21: Settling plate; 31: Scraper; 32: Scraper drive mechanism; 41: Circular inlet pipe; 42: Water distribution branch pipe; 43: Outlet; 44: Flow control valve; 51: Sand collection hopper; 52: Sand discharge valve; 53: Sand discharge pipe; 61: Controller; 62: Settling monitor; 63: Sand quantity monitor. Detailed Implementation

[0033] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0034] Example 1:

[0035] like Figure 1 As shown in the figure, a specific embodiment of the present invention provides a sand removal system for a hydrolysis acidification tank, including a water distribution component, a sand settling component, a sand scraping component, and a sand discharge component. The sand settling component is installed in the hydrolysis acidification tank 1 to form a sand settling zone 2. The water distribution component is positioned above the sand settling component, and multiple sand scraping blades 31 of the sand scraping component are evenly distributed in the sand settling zone. The sand discharge component is positioned below the sand settling zone 2 and is connected to the sand discharge port of the sand settling zone 2. The inlet of the water distribution component is connected to a sewage pipe, and the water distribution component can evenly discharge sewage into the sand settling zone 2. The sand scraping blades 31 scrape the sludge and sand in the sand settling zone 2 to the sand discharge port and enter the sand discharge component, and the sand discharge component discharges the sludge and sand out of the hydrolysis acidification tank 1. In this embodiment, the sand scraping blades 31 are made of rubber and have a certain degree of flexibility, and the sand scraping blades 31 can closely adhere to the surface of the sand settling zone 2 to perform the sand scraping operation.

[0036] Specifically, the water distribution component is positioned above the grit settling component, enabling wastewater to evenly cover the grit settling zone 2, creating a stable flow field for subsequent grit settling. This facilitates the settling of sand particles in the grit settling zone 2, avoiding the short-circuiting and eddy current problems caused by traditional single-point water distribution, improving the uniformity of water flow velocity in the grit settling zone 2, reducing sedimentation blind spots in the tank, and increasing grit settling efficiency. The grit settling component forms an independent grit settling zone 2 within the hydrolysis acidification tank 1. The grit settling zone 2 increases the sedimentation area of ​​sand particles, utilizing density differences to achieve efficient separation of sand particles from the water phase. Multiple scraper blades 31 are evenly distributed in the grit settling zone 2, adhering to the tank bottom and the surface of the grit settling zone 2, directionally scraping the settled sand particles to the grit discharge port of the grit settling zone 2, resulting in high grit removal efficiency. The grit discharge component connects to the grit discharge port of the grit settling zone 2, utilizing the gravity of the sand particles to achieve powerless or low-power discharge. Compared to existing technologies, its water distribution component, grit settling component, grit scraping component, and grit discharge component form a complete grit removal chain. The components work together to achieve uniform water distribution, efficient grit settling, thorough grit scraping, and precise grit discharge, significantly improving the grit removal effect, reducing the impact of silt on microorganisms in the hydrolysis acidification tank 1, and enhancing the hydrolysis acidification effect. This, in turn, improves the treatment capacity and effluent quality of the wastewater treatment system. Moreover, it has a simple structure, is easy to install and maintain, has low operating costs, and offers good economic and environmental benefits. It can be widely used in wastewater treatment plants and industrial wastewater treatment fields of various sizes.

[0037] Furthermore, such as Figure 3 As shown, the water distribution assembly includes a circular inlet pipe 41 and multiple water distribution branch pipes 42. The inlet of the circular inlet pipe 41 is connected to the sewage pipe. The two ends of the water distribution branch pipes 42 are connected to the circular inlet pipe 41 and the sand scraping drive mechanism 32 of the sand scraping assembly. The multiple water distribution branch pipes 42 are evenly distributed in a spoke-like pattern between the circular inlet pipe 41 and the sand scraping drive mechanism 32. Multiple outlets 43 are evenly distributed along the length of the bottom of the water distribution branch pipes 42. The spoke-like distribution covers the entire circumference of the sedimentation zone 2, and the outlets 43 are evenly arranged along the length of the branch pipes to ensure that the sewage forms a uniform laminar flow on the surface of the sedimentation zone 2, reducing turbulent disturbance. The two ends of the water distribution branch pipes 42 are respectively connected to the circular inlet pipe 41 and the sand scraping drive mechanism 32, forming a ring truss structure, which has both water distribution and support functions, resisting water flow impact and vibration. The sand scraping drive mechanism 32 is connected to the sand scraper 31 to drive the sand scraper 31 to rotate circumferentially along the sedimentation zone 2 to scrape and deliver mud and sand.

[0038] Furthermore, in this embodiment, the head loss along the pipe is offset by a gradual change in pipe diameter, ensuring that the flow rate at each outlet 43 of the water distribution branch pipe 42 is consistent, as verified by the formula:

[0039] .

[0040] Among them, Q i Let be the flow rate of the i-th water distribution branch pipe 42, and let represent the water output capacity of a certain section of the water distribution branch pipe 42. This is achieved by adjusting the pipe diameter D. i Make each water distribution branch pipe 42Qi To achieve near-uniformity and ensure even water distribution. D i Let D be the diameter of the i-th water distribution branch pipe 42. The diameter of the water distribution branch pipe 42 gradually decreases along the water flow direction. i Adjusting the flow velocity and resistance to offset the pressure drop along the pipe. g is the acceleration due to gravity; H is the total effective head of the water distribution assembly; f is the friction coefficient; L is the length of the water distribution branch pipe 42; ∑ξ is the sum of all local resistance coefficients in the water distribution branch pipe 42. Verification shows that the diameter ratio of the beginning and end of the water distribution branch pipe 42 is 1.2~1.5:1. Exceeding this range will lead to excessively low flow velocity at the beginning (sand deposition) or excessive pressure drop at the end (uneven water distribution).

[0041] Furthermore, such as Figure 4 As shown, the outlet 43 is a slit-type structure, with its length direction forming an angle of 50°~60° with the axis of the water distribution branch pipe 42. The width of the outlet 43 is preferably 5~8mm, and the spacing d between adjacent outlets 43 satisfies d=0.8vt, where v is the design flow velocity and t is the sand settling time threshold. The inclined angle of the outlet 43 allows the water flow to enter the sand settling zone 2 tangentially, inducing the water flow to form a slow vortex, extending the sand settling path (the centrifugal force of the vortex assists in sand separation). The slit width is designed to be larger than the common sand particle size, and the spacing between adjacent slits meets the dynamic design, ensuring water distribution uniformity while avoiding water flow interference caused by excessively small spacing, thus reducing the probability of clogging.

[0042] Furthermore, such as Figure 1 and Figure 2 As shown, the grit settling assembly includes multiple grit settling plates 21; these plates are arranged circumferentially along the hydrolysis acidification tank 1 to form an inverted frustum-shaped grit settling zone 2; a grit discharge port is located on any of the grit settling plates 21; the angle between the outer side of the grit settling plate 21 and the horizontal plane is 25°~35°. The inverted frustum structure has a large upper cross-sectional area to meet the requirements of wastewater diffusion; the lower cross-sectional area is small, concentrating sand particles for easy grit discharge, resulting in high volume utilization. In this embodiment, the grit settling plates 21 are made of a special hydrophilic material with a certain degree of surface roughness, which is beneficial for the adhesion and sedimentation of silt particles.

[0043] Furthermore, such as Figure 1 As shown, the sand discharge assembly includes a sand collecting hopper 51, a sand discharge valve 52, and a sand discharge pipe 53. The sand inlet of the sand discharge pipe 53 is connected to the sand discharge outlet of the settling zone 2 through the sand collecting hopper 51. The sand discharge valve 52 is located at the connection between the sand discharge pipe 53 and the sand collecting hopper 51. In this embodiment, the sand collecting hopper 51 enables sand particles to converge more quickly under gravity, improving sand discharge efficiency and reducing mud and sand residue. The sand discharge valve 52 enables on-demand sand discharge.

[0044] Furthermore, such as Figure 5As shown, in this embodiment, the sand removal system further includes a controller 61 and a data acquisition component; the signal output terminal of the data acquisition component is connected to the signal input terminal of the controller 61; the signal output terminal of the controller 61 is connected to the water distribution component, the sand scraping component, and the sand discharge component; the data acquisition component includes a sedimentation monitor 62 and a sand quantity monitor 63; the sedimentation monitor 62 is disposed in the sedimentation component, and the sand quantity monitor 63 is disposed in the sand discharge component. Specifically, in this embodiment, the water distribution component further includes a flow control valve 44, and the signal output terminal of the controller 61 is connected to the flow control valve 44; the signal output terminal of the controller 61 is connected to the sand scraping drive mechanism 32 of the sand scraping component; the signal output terminal of the controller 61 is connected to the sand discharge valve 52 of the brush discharge component; the sedimentation monitor 62 is disposed in the sedimentation plate 21, and the sand quantity monitor 63 is disposed in the sand collection hopper 51.

[0045] Furthermore, in this embodiment, the controller 61 dynamically adjusts the scraping frequency f based on the sand quantity signal fed back by the sand quantity monitor 63, satisfying the following:

[0046] .

[0047] Where K is the proportionality coefficient, ranging from 0.8 to 1.2, and W... t W0 represents the real-time sand volume, while W0 represents the baseline sand volume. An exponential term is used to achieve a non-linear match between the scraping frequency and the sand volume, avoiding over-adjustment caused by a linear relationship. Setting the exponent to 0.6 adapts to the characteristic of sand layer accumulation being initially rapid and then slowing down (rapid initial sand volume growth requires a quick response, while later, denser sand layers require stable removal). Based on W... t The ratio / W0 can be used to predict the growth trend of sand layers and adjust the frequency in advance to reduce the risk of blockage at the sand discharge port.

[0048] Furthermore, in this embodiment, the controller 61 adjusts the flow rate of the water distribution component proportionally based on the difference between the real-time data of the sedimentation volume and a preset threshold, satisfying the following:

[0049] .

[0050] Among them, Q 实际 Q represents the real-time flow rate of the water distribution component. 设计 The initial design flow rate is given by α, which is the flow rate attenuation coefficient ranging from 0.1 to 0.3; S is the amount of sediment monitored in real time in sedimentation zone 2; and S0 is the design threshold for sediment volume. When the sediment volume S approaches the design threshold S0, the influent flow rate Q is reduced proportionally by the flow rate attenuation coefficient α. 实际 This reduces the amount of new sand input and prevents sand from overflowing and getting stuck on the scraper plate 31 due to excessive instantaneous load in the settling zone 2. Reducing the flow rate also reduces the shear force of the water flow in the settling zone 2, preventing the already settled fine sand from being re-flushed and suspended, thus ensuring stable effluent quality.

[0051] Furthermore, in this embodiment, when the amount of sediment S > S0, the controller 61 simultaneously reduces the flow rate of the water distribution component and adjusts the sand scraping component, and the rotation speed of the sand scraper 31 satisfies:

[0052] .

[0053] Where n is the real-time rotational speed of the scraper blade 31; n0 is the reference rotational speed of the scraper blade 31; and β is the compensation coefficient of the scraper blade 31, with a value ranging from 0.2 to 0.4. The compensation coefficient β of the scraper blade 31 enhances the sand removal intensity, quickly clearing accumulated sand layers. The rotational speed is linearly related to the proportion of sand exceeding the threshold, ensuring a match between the driving force of the scraper blade 31 and the degree of sand accumulation.

[0054] Example 2:

[0055] This embodiment provides a sand removal method for the sand removal system of the hydrolysis acidification tank described in Embodiment 1, including the following steps:

[0056] S1. Before the sewage enters the circular inlet pipe 41, it undergoes pretreatment filtration to intercept large particles of debris, prevent slit blockage, reduce the maintenance frequency of the water distribution branch pipe 42 due to debris blockage, avoid uneven water distribution caused by slit blockage, and indirectly ensure the uniformity of water flow in the sedimentation zone 2. Specifically, according to the design flow rate Q... 设计 =500m³ / h set total inlet pressure, so that the outlet velocity of the slit is 1.0±0.2m / s, and the water flows through the slit with an inclination angle of 50°~60° and forms a vortex with an angular velocity of 0.5~1.2rad / s.

[0057] S2. The flow control valve 44 of the water distribution assembly is opened by the controller 61. The sewage enters the circular inlet pipe 41 and diffuses into the hydrolysis acidification tank 1 through the evenly distributed spoke-shaped water distribution branch pipes 42. The sewage enters the grit settling zone 2 through the slit-type outlet 43 at the bottom of the water distribution branch pipe 42.

[0058] S3. The silt and sand carried by the sewage settles in the inverted frustum-shaped sedimentation zone 2. The sedimentation monitor 62 monitors the silt thickness in the sedimentation zone 2 in real time. The controller 61 adjusts the flow rate of the water distribution component proportionally based on the difference between the real-time sedimentation data and the preset threshold. When the silt thickness exceeds the sedimentation threshold, the controller 61 activates the sand scraping drive mechanism 32. The sand scraping drive mechanism 32 drives multiple sand scrapers 31 to rotate circumferentially along the sedimentation zone 2, scraping the silt and sand in the sedimentation zone 2 to the sand discharge port and into the sand collection hopper 51 of the sand discharge component. The controller 61 dynamically adjusts the sand scraping frequency f based on the sand quantity signal fed back by the sand quantity monitor 63 in the sand collection hopper 51.

[0059] S4. The controller 61, based on the real-time monitoring of the sand volume in the sand collection hopper 51 by the sand volume monitor 63, opens the sand discharge valve 52 when the sand volume reaches the set volume, and the mud and sand are discharged along the sand discharge pipe 53 under the action of gravity.

[0060] Specifically, through the full-process control of pretreatment anti-clogging, intelligent water distribution, dynamic sand scraping, and precise sand discharge, the efficiency of sand removal, operational reliability, and energy saving have been comprehensively improved. In particular, it has formed significant technical advantages in anti-clogging and precise control, which meets the urgent needs of the wastewater treatment industry for efficient and low-consumption sand removal technology.

[0061] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sand removal system for a hydrolysis acidification tank, characterized in that, This includes water distribution components, sedimentation components, sand scraping components, and sand removal components; The grit settling assembly is installed in the hydrolysis acidification tank (1) to form a grit settling zone (2). The water distribution assembly is set above the grit settling assembly. Multiple scraper blades (31) of the scraper assembly are evenly distributed in the grit settling zone. The sand discharge assembly is set below the grit settling zone (2) and is connected to the sand discharge port of the grit settling zone (2). The inlet of the water distribution component is connected to the sewage pipe. The sewage can be evenly discharged into the sedimentation zone (2) through the water distribution component. The mud and sand in the sedimentation zone (2) are scraped and sent to the sand discharge port through the sand discharge component through the sand discharge component. The mud and sand are discharged from the hydrolysis acidification tank (1) through the sand discharge component. It also includes a controller (61) and a data acquisition component; The signal output terminal of the data acquisition component is connected to the signal input terminal of the controller (61); The signal output terminal of the controller (61) is connected to the water distribution assembly, the sand scraping assembly and the sand discharge assembly; The data acquisition components include a sedimentation monitor (62) and a sediment quantity monitor (63); A sedimentation monitor (62) is installed on the sedimentation assembly, and a sand volume monitor (63) is installed on the sand discharge assembly; The controller (61) dynamically adjusts the sand scraping frequency f based on the sand quantity signal fed back by the sand quantity monitor (63) to satisfy: ； Where K is the proportionality coefficient, ranging from 0.8 to 1.2, and W... t W0 represents the real-time sand volume, while W0 represents the baseline sand volume. The controller (61) adjusts the flow rate of the water distribution component proportionally based on the difference between the real-time data of sediment volume and the preset threshold, to satisfy: ； Among them, Q 实际 Q represents the real-time flow rate of the water distribution component. 设计 α is the initial design flow rate; α is the flow rate attenuation coefficient, with a value range of 0.1~0.3; S is the amount of sediment in the sedimentation zone (2) monitored in real time; S0 is the design threshold for sedimentation. The water distribution assembly includes a circular inlet pipe (41) and multiple water distribution branch pipes (42). The inlet of the circular water inlet pipe (41) is connected to the sewage pipe; the two ends of the water distribution branch pipe (42) are connected to the circular water inlet pipe (41) and the sand scraping drive mechanism (32) of the sand scraping assembly; multiple water distribution branch pipes (42) are evenly distributed in a wheel spoke shape between the circular water inlet pipe (41) and the sand scraping drive mechanism (32); multiple water outlets (43) are evenly opened at the bottom of the water distribution branch pipe (42) along its length direction. The outlet (43) is a slit structure, and its length direction is at an angle of 50°~60° with the axis of the water distribution branch pipe (42); the width of the outlet (43) is 5~8mm, and the distance between adjacent outlets (43) is d satisfying d=0.8vt, where v is the design flow velocity and t is the sand settling time threshold.

2. The sand removal system for the hydrolysis acidification tank as described in claim 1, characterized in that, The diameter of the water distribution branch pipe (42) gradually decreases along the direction of water flow, and the ratio of the diameter of the first end to the last end of the water distribution branch pipe (42) is 1.2~1.5:

1.

3. The sand removal system for the hydrolysis acidification tank as described in claim 1, characterized in that, The sand settling assembly includes multiple sand settling plates (21); Multiple sedimentation plates (21) are arranged around the hydrolysis acidification tank (1) to form an inverted frustum-shaped sedimentation zone (2). The angle between the outer side of the sand settling plate (21) and the horizontal plane is 25°~35°.

4. The sand removal system for the hydrolysis acidification tank as described in claim 1, characterized in that, The sand discharge assembly includes a sand collection hopper (51), a sand discharge valve (52), and a sand discharge pipe (53); The sand inlet of the sand discharge pipe (53) is connected to the sand discharge outlet of the sedimentation zone (2) through the sand collection hopper (51), and the sand discharge valve (52) is set at the connection between the sand discharge pipe (53) and the sand collection hopper (51).

5. The sand removal system for the hydrolysis acidification tank as described in claim 1, characterized in that, When the sedimentation rate S > S0, the controller (61) simultaneously reduces the flow rate of the water distribution component and adjusts the sand scraping component, and the rotation speed of the sand scraper (31) satisfies: ； Where n is the real-time rotational speed of the scraper (31); n0 is the reference rotational speed of the scraper (31); β is the compensation coefficient of the scraper (31), with a value range of 0.2~0.4.

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