Grinding wastewater purification treatment system

Abstract

The utility model relates to the technical field of wastewater purification treatment, in particular to a grinding wastewater purification treatment system which comprises a filter tank, a water collection regulating tank, a physicochemical reaction tank, a primary sedimentation tank, an intermediate tank, a UASB (Upflow Anaerobic Sludge Blanket) anaerobic tank, a facultative tank, an aerobic nitrification tank, a secondary sedimentation tank, a water outlet tank and a sludge tank which are communicated in sequence. According to the utility model, the grinding wastewater is primarily filtered through the filter tank; a physicochemical reaction tank is arranged, PAC, PAM and alkali liquor are added to generate floccules, and the impurity removal rate of a primary sedimentation tank is increased; a UASB anaerobic tank is arranged to hydrolyze, acidify and decompose refractory organic matters and insoluble organic matters, so that the COD removal rate is increased; the aerobic tank adopts an aeration contact oxidation method, a vertical aeration pipe and a magnetic suspension fan for supplying air, so that the energy consumption is reduced, and the content of dissolved oxygen is increased. The grinding wastewater purification treatment system disclosed by the utility model can solve the technical problems of poor sludge settling performance, low purification treatment efficiency and high equipment energy consumption of the existing grinding wastewater purification device.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater purification and treatment, in particular to a grinding wastewater purification and treatment system. Background Art

[0002] During the grinding process of materials such as metal, stone, and carbon, manufacturing enterprises generate a large amount of grinding wastewater, which contains a large number of impurities and acidic and alkaline substances. The current treatment process for grinding wastewater is as follows: the wastewater enters the water collection and regulating tank for water volume and quality balance and stabilization, and is then pumped by a lift pump to the pH regulating tank, where alkali solution is added to adjust the pH to around 8.0-9.0; the supernatant from the primary sedimentation tank is discharged to the anaerobic hydrolysis tank for hydrolysis and acidification. The supernatant from the anaerobic hydrolysis tank is then sent to the aerobic tank, where microorganisms decompose most of the organic matter in the water. The water from the aerobic tank is then sent to the secondary sedimentation tank. The sedimented water passes through an adjustable overflow weir and enters the discharge tank to meet discharge standards. The remaining sludge is discharged to the sludge dewatering system.

[0003] However, there are some technical problems in the above process: the COD concentration of the grinding wastewater is high and unstable, the influent contains a large amount of impurities, which can easily lead to clogging of the lifting pump of the water collection and regulating tank, the mud-water separation performance of the primary sedimentation tank is poor, and a large amount of floating black suspended matter cannot be settled, resulting in turbid mud in the effluent and difficulty in cultivating anaerobic bacteria to form an acidic environment; the existing aerobic tank uses a Roots blower to supply air to the aeration pipe, the air volume cannot be adjusted, the electricity consumption is large, and it is not easy to adjust the dissolved oxygen in the aerobic tank; the SV30 of the aerobic tank sludge is maintained at around 96~98, and the sludge settling performance of the secondary sedimentation tank is poor. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a grinding wastewater purification system, which mainly solves the technical problems of poor sludge settling performance, low purification efficiency and high equipment energy consumption in the existing grinding wastewater purification devices.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] In one technical solution of the utility model, a grinding wastewater purification system is provided, which includes a filter tank, a water collection and regulating tank, a physicochemical reaction tank, a primary sedimentation tank, an intermediate tank, a UASB anaerobic tank, an aerobic tank, an aerobic nitrification tank, a secondary sedimentation tank and a water outlet tank, which are connected in sequence.

[0007] The filter pool is provided with a water inlet above, a filter screen inside the filter pool, and a grille wall at the bottom of the filter pool connected to the water collection and regulating pool;

[0008] A first lifting pump is provided at the bottom of the water collection and regulating tank to transport the filtered grinding wastewater to the physicochemical reaction tank;

[0009] The physicochemical reaction tank is connected to a dosing device through a dosing pipeline, and a second lifting pump is provided at the bottom of the physicochemical reaction tank for transporting the wastewater in the physicochemical reaction tank to the primary sedimentation tank;

[0010] The supernatant in the primary sedimentation tank overflows into the intermediate tank, and a first sewage pump is provided at the bottom of the primary sedimentation tank to transport the bottom sludge to the sludge tank;

[0011] The intermediate tank is provided with a sewage pump to transport wastewater to the bottom of the UASB anaerobic tank;

[0012] The UASB anaerobic tank has a sludge bed at the bottom, a three-phase separator at the top, and a gas collecting chamber connected to the outside at the top. The effluent from the upper part of the UASB anaerobic tank is transported to the lower part of the facultative aerobic tank through a pipeline, and the effluent from the upper part of the facultative aerobic tank is transported to the lower part of the aerobic nitrification tank through a pipeline.

[0013] The aerobic nitrification tank is provided with a plurality of vertical aeration pipes distributed vertically, and the air inlet end of the vertical aeration pipe is connected to a magnetic suspension fan. The upper effluent of the aerobic nitrification tank is transported to the lower part of the secondary sedimentation tank through a pipeline;

[0014] A sludge hopper is provided at the lower part of the secondary sedimentation tank, and the bottom of the sludge hopper is connected to the second sewage pump through a pipeline. The sludge in the sludge hopper is transported to the sludge tank through the second sewage pump. An overflow weir is provided at the upper part of the secondary sedimentation tank. The supernatant in the secondary sedimentation tank flows to the outlet tank through the overflow weir. An outlet is provided at the upper part of the outlet tank to connect to external water equipment or a sewage treatment plant.

[0015] Using this technical solution, grinding wastewater enters the filter tank from the water inlet, flows through the filter screen and grille wall to remove large particles of impurities, and then enters the water collection and regulation tank. The water volume and quality of each stage are adjusted and equalized to adjust the high and low pollutant content, ensuring the balance and stability of water volume and quality in the subsequent biochemical treatment system. A lift pump transports the wastewater from the water collection and regulation tank to the physicochemical reaction tank. Chemicals such as PAC, PAM, and liquid caustic soda are added to the physicochemical reaction tank through a dosing device to adjust the wastewater pH to approximately 8.0-9.0, and to form flocs from denser suspended impurities in the wastewater, thereby increasing the sedimentation rate in the primary sedimentation tank. A second lift pump then transports the wastewater to the primary sedimentation tank for sedimentation to remove some impurities. The supernatant effluent from the primary sedimentation tank flows into the intermediate tank, and the sludge at the bottom of the primary sedimentation tank is transported to the sludge tank via the first sewage pump. Wastewater from the intermediate tank is pumped to the bottom of the UASB anaerobic tank via a sewage pump. The wastewater then flows upward through a sludge bed containing granular or flocculent sludge. Anaerobic reactions occur during contact between the wastewater and sludge particles, generating biogas that circulates internally. Biogas, both attached and unattached to the sludge, rises to the top, impacting the gas emission plates of the three-phase separator, degassing the sludge flocs with attached bubbles. Once the bubbles are released, the sludge particles settle to the surface of the sludge bed, and the gases are collected in a gas collection chamber at the top and discharged. The effluent from the upper UASB anaerobic tank flows into the facultative aerobic tank, where nutrients are added to gradually transition the bacterial strains in the water from anaerobic to aerobic conditions. The effluent from the facultative aerobic tank then flows into the aerobic nitrification tank. A magnetically levitated fan supplies air to the vertical aeration pipes, ensuring sufficient air volume while increasing the dissolved oxygen content in the water, enhancing the efficiency of the nitrification reaction and accelerating the oxidative decomposition of organic matter. This combined anoxic and aerobic process cultivates diverse microbial communities, which degrade most of the wastewater's pollutants, including COD, N, and P. The effluent from the upper part of the aerobic nitrification tank flows into the secondary sedimentation tank, and the supernatant flows to the effluent tank through the overflow weir and is discharged from the outlet to the external water equipment or sewage treatment plant. The sludge in the water is deposited in the sludge hopper at the bottom and transported to the sludge tank through the second sewage pump for further dehydration treatment.

[0016] Furthermore, a stopper is provided on the inner wall of the filter tank, which is flush with the top of the grille wall. The filter screen is clipped onto the stopper and the grille wall. The filter screen is removably installed in the filter tank and cooperates with the grille wall to achieve a double-layer filtration effect, effectively removing large particles of impurities in the filtered wastewater and preventing wastewater from entering the water collection and regulating tank and clogging the first lift pump.

[0017] Furthermore, the dosing device is connected to a first lift pump via a water supply line, drawing water from the water collection and regulating tank and transporting it to the dosing device for initial dissolution and mixing of the reagent. The dosing device is equipped with an agitator for stirring, mixing, and dissolving the reagent. PAC, PAM, and liquid caustic soda are added to the dosing device for coagulation and flocculation, removing pollutants such as organic matter (COD), oils, heavy metal ions, and nitrogen and phosphorus from the wastewater.

[0018] Furthermore, a plurality of spaced-apart spoiler baffles are provided in the physicochemical reaction tank, one end of each spoiler baffle is fixedly connected to the physicochemical reaction tank, and the other end does not contact the inner wall of the physicochemical reaction tank. Two adjacent spoiler baffles are respectively fixed on non-same-side inner walls of the physicochemical reaction tank. After the wastewater and the liquid medicine are mixed, they flow through each spoiler baffle from top to bottom in sequence, forming an S-shaped flow path, which has a turbulent mixing effect, prolongs the contact reaction time between the liquid medicine and the wastewater, and improves the flocculation effect.

[0019] Furthermore, the UASB anaerobic tank is equipped with an internal return pipe, with its upper and lower ends connected to the gas collection chamber and the sludge bed, respectively. Due to the biogas's gas lift effect, the mixture of biogas, sludge, and water rises to the three-phase separator, where the biogas is separated from the sludge and water and collected in the gas collection chamber for discharge into the treatment system. The sludge and water mixture then returns along the internal return pipe to the bottom of the UASB anaerobic tank, where it is fully mixed with the influent and then enters the sludge bed, forming an internal circulation system, thereby improving the mass transfer and mixing between the sludge and water.

[0020] Furthermore, a nitrification liquid reflux pipe is provided between the aerobic nitrification tank and the facultative aerobic tank to return the nitrification liquid in the aerobic nitrification tank to the facultative aerobic tank for reprocessing, thereby maintaining the concentration of microbial flora and further removing pollutants such as nitrogen, phosphorus, and COD in the wastewater.

[0021] Furthermore, a sludge return pipe is provided between the secondary sedimentation tank and the aerobic tank to return the activated sludge in the secondary sedimentation tank to the aerobic tank, so as to maintain the quantity and stability of the activated sludge in the treatment system, increase the residence time of the sludge in the aerobic nitrification tank, and facilitate the removal of organic matter and the biodegradation process, thereby improving the sewage treatment efficiency.

[0022] Furthermore, the sludge pool is connected to a filter press workshop, which is equipped with a high-pressure diaphragm filter press. The sludge in the sludge pool is transported to the filter press workshop through a pipeline for dehydration treatment. The filtrate generated in the filter press workshop is transported to a water collection and regulating tank through a pipeline. The mud cake dehydrated in the filter press workshop is collected and outsourced for treatment.

[0023] The beneficial effects of the utility model are as follows:

[0024] The grinding wastewater purification treatment system provided by the utility model adds a filter pool at the water inlet, and sets a filter screen and a grille wall, which can preliminarily filter and remove large particles of impurities and floating objects in the grinding wastewater, avoid clogging the lifting pump, and improve the subsequent biochemical treatment efficiency of impurities in the wastewater.

[0025] The utility model transforms the traditional pH regulating tank into a physicochemical reaction tank, performs pretreatment at the water inlet, and simultaneously adds PAC, PAM and alkali solution, which can convert the fine and dense suspended impurities in the wastewater into floccules, which then enter the primary sedimentation tank for sedimentation and removal, and can quickly achieve the effect of separating water and impurities, increase the impurity removal rate of the primary sedimentation tank, and also improve the influence of the subsequent biochemical system on the activated sludge, thereby improving the efficiency of the biochemical treatment.

[0026] The utility model also adds a UASB anaerobic pool, which utilizes the characteristics of the acidic fermentation stage during the anaerobic decomposition of organic matter to convert large-molecule difficult-to-degrade organic matter into small-molecule organic matter that is easily degraded by microorganisms, and degrades most insoluble organic matter into soluble substances, creating favorable conditions for subsequent aerobic treatment. The COD removal rate can reach more than 90%. The biogas generated by the system can be collected and enter the biogas water seal tank (fire retardant tank), and then passed into the user's own biogas storage tank or burned for treatment.

[0027] The aerobic pool of the utility model adopts an aeration contact oxidation method, is provided with a vertical aeration pipe, and adopts a magnetic levitation fan to supply air to the vertical aeration pipe. The magnetic levitation fan has a large frequency conversion adjustment range for wind pressure and air volume, can better adapt to the changes in water volume and water quality of the sewage plant, and timely adjust the control parameters to make the aeration volume adjustment more accurate, save energy consumption, and increase the dissolved oxygen content of the aerobic pool. The aeration pipe can be directly pulled out from the top of the aerobic pool for cleaning, maintenance and replacement when the system is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the internal structure of the grinding wastewater purification treatment system in the utility model;

[0030] Figure 2 yes Figure 1 Enlarged view of point "A" in the middle;

[0031] Figure 3 yes Figure 1 Enlarged view of point "B" in the middle;

[0032] Figure 4 It is a schematic diagram of the wastewater treatment process of the grinding wastewater purification treatment system of the present utility model.

[0033] Explanation of the numbers in the figure: 1. Filter tank; 101. Water inlet; 102. Filter screen; 103. Grille wall; 104. Limit block; 2. Water collection and regulation tank; 201. First lifting pump; 3. Physicochemical reaction tank; 301. Dosing pipeline; 302. Dosing device; 303. Second lifting pump; 304. Water adding pipeline; 305. Agitator; 306. Disturbing baffle; 4. Primary sedimentation tank; 401. First sewage pump; 5. Intermediate tank; 501. Sewage pump; 6. U ASB anaerobic tank; 601, sludge bed; 602, three-phase separator; 603, gas collecting chamber; 604, internal return pipe; 7, facultative aerobic tank; 8, aerobic nitrification tank; 801, vertical aeration pipe; 802, magnetic levitation fan; 803, nitrification liquid return pipe; 9, secondary sedimentation tank; 901, sludge hopper; 902, second sewage pump; 903, overflow weir; 904, sludge return pipe; 10, outlet tank; 11, sludge tank; 12, filter press workshop; 13, water outlet. DETAILED DESCRIPTION

[0034] The following describes the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand the other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of the present invention are limited to the embodiment.

[0035] In the description of this embodiment, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top", "bottom", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to has a specific direction, is constructed and operates in a specific direction. Therefore, they should not be understood as limiting the utility model.

[0036] In the description of this embodiment, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on their specific circumstances.

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0038] like Figures 1 to 3As shown, in one embodiment of the present invention, a grinding wastewater purification system is provided, including a filter tank 1, a water collection and regulation tank 2, a physicochemical reaction tank 3, a primary sedimentation tank 4, an intermediate tank 5, a UASB anaerobic tank 6, an aerobic tank 7, an aerobic nitrification tank 8, a secondary sedimentation tank 9 and an outlet tank 10, which are connected in sequence.

[0039] Specifically, a water inlet 101 for wastewater inflow is provided above the filter tank 1, a filter screen 102 is provided inside the filter tank 1, and a grille wall 103 is provided at the bottom of the filter tank 1 to communicate with the water collection and regulation tank 2. A first lifting pump 201 is provided at the bottom of the water collection and regulation tank 2 to transport the filtered grinding wastewater to the physicochemical reaction tank 3. The physicochemical reaction tank 3 is connected to a dosing device 302 through a dosing pipeline 301, and a second lifting pump 303 is provided at the bottom of the physicochemical reaction tank 3 to transport the wastewater in the physicochemical reaction tank 3 to the primary sedimentation tank 4. The supernatant in the primary sedimentation tank 4 overflows into the intermediate tank 5, and a first sewage pump 401 is provided at the bottom of the primary sedimentation tank 4 to transport the bottom sludge to the sludge tank 11. A sewage pump 501 is provided in the intermediate tank 5 to transport the wastewater to the bottom of the UASB anaerobic tank 6.

[0040] The UASB anaerobic tank 6 has a sludge bed 601 at its bottom, a three-phase separator 602 at its top, and a gas collecting chamber 603 connected to the outside at its top. The effluent from the upper portion of the UASB anaerobic tank 6 is piped to the lower portion of the facultative aerobic tank 7, which in turn is piped to the lower portion of the aerobic nitrification tank 8. The aerobic nitrification tank 8 is equipped with several vertically distributed sets of plastic vertical aeration pipes 801. The air inlet ends of the vertical aeration pipes 801 are connected to magnetic levitation fans 802. The effluent from the upper portion of the aerobic nitrification tank 8 is piped to the lower portion of the secondary sedimentation tank 9. A sludge hopper 901 is located at the lower portion of the secondary sedimentation tank 9. The bottom of the sludge hopper 901 is connected to a second sewage pump 902 via a pipeline. The second sewage pump 902 pumps the sludge in the hopper 901 to the sludge tank 11. An overflow weir 903 is provided at the upper part of the secondary sedimentation tank 9. The supernatant in the secondary sedimentation tank 9 flows to the outlet tank 10 through the overflow weir 903. An outlet port 13 is provided at the upper part of the outlet tank 10. The treated wastewater in the outlet tank 10 is discharged to an external sewage treatment plant or other water use points through the outlet port 13.

[0041] refer to Figure 2 A stopper 104 is provided on the inner wall of the filter tank 1, and the stopper 104 is flush with the top of the grille wall 103. The filter screen 102 is clamped above the stopper 104 and the grille wall 103. The filter screen 102 is detachably mounted within the filter tank 1, and cooperates with the grille wall 103 to achieve a double-layer filtration effect, effectively removing large particles of impurities in the filtered wastewater and preventing the wastewater from entering the water collection and regulating tank and clogging the first lift pump 201.

[0042] refer to Figure 1 and Figure 2The dosing device 302 is connected to the first lift pump 201 via a water supply line 304. Water is drawn from the water collection and regulating tank 2 and transported to the dosing device 302 for initial dissolution and mixing of the reagent. The dosing device 302 is equipped with an agitator 305 for stirring, mixing, and dissolving the reagent. PAC, PAM, and liquid caustic soda are added to the dosing device 302 for coagulation and flocculation, removing pollutants such as organic matter (COD), oils, heavy metal ions, and nitrogen and phosphorus from the wastewater. A plurality of spaced-apart spoiler baffles 306 are provided in the physicochemical reaction tank 3. One end of each spoiler baffle 306 is fixedly connected to the physicochemical reaction tank 3, and the other end does not contact the inner wall of the physicochemical reaction tank 3. Two adjacent spoiler baffles 306 are respectively fixed on the inner walls of the physicochemical reaction tank 3 on different sides. After the wastewater and the liquid medicine are mixed, they flow through each spoiler baffle 306 from top to bottom in turn, forming an S-shaped flow path, which has a turbulent mixing effect, prolongs the contact reaction time between the liquid medicine and the wastewater, and improves the flocculation effect.

[0043] refer to Figure 1 and Figure 3 , an internal return pipe 604 is provided inside the UASB anaerobic tank 6, and the upper and lower ends of the internal return pipe 604 are connected to the gas collecting chamber 603 and the sludge bed 601 respectively. Due to the gas lift effect of biogas, the mixture of biogas, sludge and water rises to the three-phase separator 602, where the biogas is separated from the mud and water and collected into the gas collecting chamber 603 to be discharged into the treatment system. The mud and water mixture then returns to the bottom of the UASB anaerobic tank 6 along the internal return pipe 604 and is fully mixed with the influent before entering the sludge bed 601, forming an internal circulation, thereby improving the mass transfer and mixing effect between mud and water. The anaerobic sludge concentration in the UASB anaerobic tank 6 is high, with an average sludge concentration of 20~40gMLVSS / L, a high organic load, and a short hydraulic retention time. For example, when medium-temperature fermentation is adopted, the volumetric load is 5~10kgCOD / (m 3 •d). UASB anaerobic tank 6 does not contain any mixing equipment. Instead, the upward movement of biogas generated during the fermentation process keeps the sludge above the sludge bed suspended and also stirs the lower sludge layer to a certain extent. UASB anaerobic tank 6 utilizes the acidic fermentation phase of the anaerobic decomposition process to convert certain large, recalcitrant organic matter into small molecules that are easily degraded by microorganisms. It also degrades most insoluble organic matter into soluble substances, creating conditions for subsequent aerobic treatment. The biogas generated by the system is collected and stored in a biogas water-sealed tank (flame retardant tank). It is then fed into a user-provided biogas storage tank or burned for disposal.

[0044] refer to Figure 1 and Figure 3A nitrification liquid return pipe 803 is provided between the aerobic nitrification tank 8 and the facultative aerobic tank 7 to return the nitrification liquid in the aerobic nitrification tank 8 to the facultative aerobic tank 7 for reprocessing, maintain the concentration of microbial flora, and further remove pollutants such as nitrogen, phosphorus, and COD in the wastewater. A sludge return pipe 904 is provided between the secondary sedimentation tank 9 and the facultative aerobic tank 7 to return the activated sludge in the secondary sedimentation tank 9 to the facultative aerobic tank 7 to maintain the amount and stability of the activated sludge in the treatment system, increase the residence time of the sludge in the aerobic nitrification tank 8, and facilitate the removal of organic matter and the biodegradation process, thereby improving the treatment efficiency of sewage. The sludge tank 11 is connected to the filter press workshop 12, which is equipped with a high-pressure diaphragm filter press. The sludge in the sludge tank 11 is transported to the filter press workshop 12 through a pipeline for dehydration treatment. The filtrate produced in the filter press workshop 12 is transported to the water collection and regulating tank 2 through a pipeline. The mud cake dehydrated in the filter press workshop 12 is collected and outsourced for treatment.

[0045] All pipelines of the utility model are equipped with electric valves, which are connected to the remote PLC control system and can be remotely and automatically controlled. The system has good stability and a high total wastewater treatment capacity.

[0046] When the grinding wastewater purification system of the utility model is in operation:

[0047] refer to Figure 1 and Figure 4 The grinding wastewater enters the filter tank 1 from the water inlet 101, flows through the filter screen 102 and the grille wall 103 in sequence to filter out large particles of impurities, and then enters the water collection and regulation tank 2. The water volume and water quality of each stage are regulated and equalized according to the high and low values ​​of pollutant content to ensure the balance and stability of the water volume and water quality of the subsequent biochemical treatment system. The wastewater in the water collection and regulation tank 2 is transported to the physicochemical reaction tank 3 by the lifting pump 201. The physicochemical reaction tank 3 is added with chemicals such as PAC, PAM and liquid alkali through the dosing device 302 to adjust the pH of the wastewater to about 8.0-9.0, and the suspended impurities with higher density in the wastewater are formed into floccules to improve the sedimentation rate of the primary sedimentation tank. The wastewater is transported to the primary sedimentation tank 4 by the second lifting pump 303 to sediment and remove some impurities in the water. The supernatant in the primary sedimentation tank 4 flows into the intermediate tank 5. The sludge at the bottom of the primary sedimentation tank 4 is transported to the sludge tank 11 by the first sewage pump 401.

[0048] Wastewater from the intermediate tank 5 is pumped to the bottom of the UASB anaerobic tank 6 via a sewage pump 501. The wastewater then flows upward through a sludge bed 601 containing granular or flocculent sludge. Anaerobic reactions occur during contact between the wastewater and sludge particles, generating biogas that circulates internally. Biogas, both attached and unattached to the sludge, rises to the top, impacting the gas emission plates of the three-phase separator 602, degassing the sludge flocs with attached bubbles. After the bubbles are released, the sludge particles settle to the surface of the sludge bed 601, and the gas is collected in the top gas collection chamber 603 for discharge.

[0049] The upper effluent from the UASB anaerobic tank 6 flows into the facultative aerobic tank 7, where nutrients are supplemented to gradually convert the biological bacteria in the water from anaerobic to aerobic. The upper effluent from the facultative aerobic tank 7 then flows into the aerobic nitrification tank 8. A magnetic levitation fan 802 supplies air to the vertical aeration pipe 801, ensuring sufficient air volume while increasing the dissolved oxygen content in the water, improving the efficiency of the nitrification reaction, and accelerating the oxidative decomposition of organic matter. Through a combined anoxic and aerobic process, diverse microbial flora are cultivated, relying on microorganisms to degrade most of the COD, N, P, and other pollutants in the wastewater. A portion of the nitrified liquid in the aerobic nitrification tank 8 is returned to the facultative aerobic tank 7 through the nitrified liquid return pipe 803 to maintain the microbial flora concentration and further remove pollutants such as nitrogen, phosphorus, and COD from the wastewater.

[0050] The effluent from the aerobic nitrification tank 8 flows into the secondary sedimentation tank 9. The supernatant flows through the overflow weir 903 to the effluent tank 10 and is discharged from the outlet 13 to an external water-using device or sewage treatment plant. The sludge in the water is deposited in the sludge hopper 901 at the bottom and is transported to the sludge tank 11 via the second sewage pump 902. Some of the activated sludge in the secondary sedimentation tank 9 is returned to the aerobic tank 7 via the sludge return pipe 904 to maintain the quantity and stability of the activated sludge in the treatment system and increase the sludge residence time in the aerobic nitrification tank 8. The sludge tank 11 is connected to the filter press workshop 12, which is equipped with a high-pressure diaphragm filter press. The sludge in the sludge tank 11 is transported to the filter press workshop 12 via a pipeline for dehydration treatment, reducing the sludge moisture content to approximately 65%. The filtrate produced in the filter press workshop 12 is transported via a pipeline to the water collection and regulating tank 2. The dehydrated sludge cake is collected and outsourced for treatment.

[0051] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, those skilled in the art should understand that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the specific implementation of the present invention is not limited to these descriptions. Therefore, any technical solution that can be derived by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technologies shall fall within the scope of protection defined by the claims.

Claims

1. A grinding wastewater purification system, characterized in that: It includes a filtering tank (1), a water collection and regulating tank (2), a physicochemical reaction tank (3), a primary sedimentation tank (4), an intermediate tank (5), a UASB anaerobic tank (6), an aerobic tank (7), an aerobic nitrification tank (8), a secondary sedimentation tank (9) and a water outlet tank (10) which are connected in sequence; A water inlet (101) is provided above the filter pool (1), a filter screen (102) is provided inside the filter pool (1), and a grille wall (103) is provided at the bottom of the filter pool (1) and is connected to the water collection and regulation pool (2); A first lifting pump (201) is provided at the bottom of the water collection and regulation tank (2) to transport the filtered grinding wastewater to the physicochemical reaction tank (3); The physicochemical reaction tank (3) is connected to a dosing device (302) via a dosing pipeline (301), and a second lifting pump (303) is provided at the bottom of the physicochemical reaction tank (3) for transporting wastewater in the physicochemical reaction tank (3) to the primary sedimentation tank (4); The supernatant in the primary sedimentation tank (4) overflows into the intermediate tank (5), and a first sewage pump (401) is provided at the bottom of the primary sedimentation tank (4) to transport the bottom sludge to the sludge tank (11); The intermediate tank (5) is provided with a sewage pump (501) to transport wastewater to the bottom of the UASB anaerobic tank (6); The UASB anaerobic tank (6) has a sludge bed (601) at the bottom, a three-phase separator (602) at the top, and a gas collecting chamber (603) connected to the outside at the top. The effluent from the upper part of the UASB anaerobic tank (6) is transported to the lower part of the anoxic tank (7) through a pipeline, and the effluent from the upper part of the anoxic tank (7) is transported to the lower part of the aerobic nitrification tank (8) through a pipeline. The aerobic nitrification tank (8) is provided with a plurality of groups of vertically distributed vertical aeration pipes (801), the air inlet ends of the vertical aeration pipes (801) are connected to magnetic suspension fans (802), and the upper effluent of the aerobic nitrification tank (8) is transported to the lower part of the secondary sedimentation tank (9) through pipelines; A sludge hopper (901) is provided at the lower part of the secondary sedimentation tank (9). The bottom of the sludge hopper (901) is connected to a second sewage pump (902) via a pipeline. The sludge in the sludge hopper (901) is transported to the sludge tank (11) via the second sewage pump (902). An overflow weir (903) is provided at the upper part of the secondary sedimentation tank (9). The supernatant in the secondary sedimentation tank (9) flows to the outlet tank (10) via the overflow weir (903). An outlet (13) is provided at the upper part of the outlet tank (10) for connection to an external water-using device or a sewage treatment plant.

2. A grinding wastewater purification system according to claim 1, characterized in that: A limit block (104) is provided on the inner wall of the filter tank (1), the limit block (104) is flush with the top of the grille wall (103), and the filter screen (102) is clamped above the limit block (104) and the grille wall (103).

3. A grinding wastewater purification system according to claim 1, characterized in that: The dosing device (302) is connected to the first lifting pump (201) via a water adding pipeline (304), and water is taken from the water collecting and regulating tank (2) and transported to the dosing device (302). An agitator (305) is provided in the dosing device (302).

4. A grinding wastewater purification system according to claim 1, characterized in that: A plurality of flow-distributing baffles (306) are arranged at intervals in the physicochemical reaction pool (3); one end of each flow-distributing baffle (306) is fixedly connected to the physicochemical reaction pool (3), and the other end does not contact the inner wall of the physicochemical reaction pool (3); two adjacent flow-distributing baffles (306) are respectively fixed on inner walls of the physicochemical reaction pool (3) on different sides.

5. A grinding wastewater purification system according to claim 1, characterized in that: An internal recirculation pipe (604) is provided inside the UASB anaerobic tank (6), and the upper and lower ends of the internal recirculation pipe (604) are respectively connected to the gas collecting chamber (603) and the sludge bed (601).

6. A grinding wastewater purification system according to claim 1, characterized in that: A nitrification liquid return pipe (803) is provided between the aerobic nitrification pool (8) and the anoxic pool (7) to return the nitrification liquid in the aerobic nitrification pool (8) to the anoxic pool (7) for reprocessing.

7. A grinding wastewater purification system according to claim 1, characterized in that: A sludge return pipe (904) is provided between the secondary sedimentation tank (9) and the aerobic tank (7) to return the activated sludge in the secondary sedimentation tank (9) to the aerobic tank (7).

8. A grinding wastewater purification system according to claim 1, characterized in that: The sludge pool (11) is connected to a filter press workshop (12), and a high-pressure diaphragm filter press is provided in the filter press workshop (12). The sludge in the sludge pool (11) is transported to the filter press workshop (12) via a pipeline for dehydration treatment, and the filtrate generated in the filter press workshop (12) is transported to the water collection and regulating tank (2) via a pipeline.

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