A method for enhancing sludge granulation in a continuous flow sewage biological treatment system

Abstract

The present application relates to sewage treatment technical field, more specifically, it relates to a kind of in continuous flow sewage biochemical treatment system Enhanced sludge granulation method, comprising the following steps: control sewage and return sludge into the biochemical tank of continuous flow sewage biochemical treatment system;Control the intermittent stirring of mixing component to the sewage and return sludge entered into the biochemical tank, so that sludge forms particle stratification, the heavy sludge obtained by particle stratification is deposited in the bottom layer of biochemical tank, and the light sludge obtained by particle stratification is deposited in the upper layer of biochemical tank;The sewage entering the biochemical tank from the sewage inlet of biochemical tank first contacts with heavy sludge, and the suspended matter, dissolved organic matter and nutrient in sewage are absorbed by heavy sludge.The present application effectively inhibits the growth of light sludge, reduces the proportion of light sludge, indirectly reduces the overall amount of sludge, improves the overall quality and processing efficiency of sludge, and reduces the subsequent processing cost.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a method for enhancing sludge granulation in a continuous flow wastewater biological treatment system. Background Technology

[0002] Currently, most water sources worldwide are polluted to varying degrees. The main cause of water pollution is the direct discharge of untreated or partially treated sewage and waste into surface water bodies. Meanwhile, the water supply industry, severely affected by water pollution, also discharges large amounts of industrial wastewater into rivers. Wastewater from water treatment plants includes concentrated suspended solids and organic matter, as well as coagulants remaining in the sludge. It mainly consists of sludge discharge from sedimentation tanks and backwash water from filters. This concentrated sludge discharge has an increased solids content and is often referred to as water supply sludge. However, in wastewater treatment, the formation of sludge particles under natural conditions is often slow and inefficient. The presence of lightweight sludge can also interfere with the formation and stability of granular sludge, severely impacting wastewater treatment efficiency and effectiveness. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for enhancing sludge granulation in a continuous flow wastewater biological treatment system.

[0004] The technical solution adopted in this invention is:

[0005] A method for enhancing sludge granulation in a continuous flow wastewater biological treatment system includes the following steps:

[0006] Sewage and returned sludge are controlled to enter the biological treatment tank of the continuous flow sewage biological treatment system, and the horizontal height of the sewage inlet of the biological treatment tank is lower than the horizontal height of the returned sludge inlet of the biological treatment tank.

[0007] The stirring components are controlled to intermittently stir the sewage and return sludge entering the biological treatment tank, so that the sludge forms granular stratification. The heavy sludge obtained from granular stratification is deposited at the bottom of the biological treatment tank, and the light sludge obtained from granular stratification is deposited at the top of the biological treatment tank.

[0008] Wastewater entering the biological treatment tank through the wastewater inlet first comes into contact with heavy sludge. After the heavy sludge adsorbs suspended solids, dissolved organic matter, and nutrients in the wastewater, the wastewater flows upward and is discharged through the outlet at the top of the biological treatment tank.

[0009] Furthermore, the sewage inlet of the biological treatment tank is located at the bottom of one side of the biological treatment tank, and the sludge return inlet of the biological treatment tank is located in the middle of one side of the biological treatment tank.

[0010] Furthermore, when controlling the entry of sewage and returned sludge into the biological treatment tank of the continuous flow sewage biological treatment system, a baffle is installed in the biological treatment tank to divide the tank into a contact zone and a purification zone for influent treatment. The contact zone and the purification zone are connected by an outlet set on the baffle. The contact zone is connected to the sewage inlet and the returned sludge inlet. When the stirring component is turned on, the heavy sludge is synchronously swirled and stirred. Under the driving force of the subsequently entering sewage and returned sludge, the heavy sludge is output from the outlet of the contact zone to the purification zone.

[0011] Furthermore, a sewage distribution pipe is installed at the sewage inlet, allowing sewage to enter the contact area of ​​the biological treatment tank evenly through multiple water distribution holes on the sewage distribution pipe from the bottom of the contact area.

[0012] Furthermore, the influent flow rate of the wastewater is Q, and the flow rate of the returned sludge is Q. 泥 Q 泥 =0.5-2.0Q; When sewage and returned sludge flow upward together, they form an upward velocity V, V=Q+Q 泥 / S, where S is the surface area of ​​the contact area.

[0013] Furthermore, the flow velocity of the water distribution hole is v1 = 1.0-2.5 m / h.

[0014] Furthermore, a sludge distribution pipe is installed at the sludge inlet, allowing the sludge to enter the contact zone evenly from the center of the biological treatment tank through multiple sludge distribution holes on the sludge distribution pipe.

[0015] Furthermore, the flow velocity at the mud-covering orifice is v2 = 1.0-2.5 m / h.

[0016] Furthermore, the continuous flow wastewater biochemical treatment system includes: a biochemical tank, a wastewater inlet at the bottom of the biochemical tank, a return sludge inlet on the side of the biochemical tank, a stirring component inside the biochemical tank, the stirring component being located between the wastewater inlet and the return sludge inlet; and a sludge distribution pipe installed at the return sludge inlet.

[0017] As can be seen from the above solution, the beneficial effects of the present invention are as follows:

[0018] In a method for enhancing sludge granulation in a continuous-flow wastewater biological treatment system, a contact zone is created in the inlet section of the biological treatment tank. Wastewater and returned sludge come into contact in this zone, and through intermittent stirring, the returned sludge forms granular stratification. Heavy sludge, due to its larger particle size and higher settling velocity, settles at the bottom, while light sludge, due to its smaller particle size and lower settling velocity, settles at the top. When wastewater enters from the bottom of the contact zone, it first contacts the heavy sludge at the bottom. The heavy sludge fully utilizes the nutrients in the influent to grow. As the heavy sludge at the bottom continuously absorbs and utilizes the nutrients, the growth of the light sludge at the top is inhibited because it cannot obtain enough nutrients. This promotes and enhances the granulation growth of the heavy sludge at the bottom and effectively inhibits the growth of light sludge, reducing the proportion of light sludge and indirectly reducing the overall sludge production. This improves the overall sludge quality and treatment efficiency, and lowers subsequent treatment costs.

[0019] The advantages of this invention are:

[0020] 1. Improve sludge granulation efficiency: Through intermittent stirring and bottom water intake strategies, the sludge granulation process is significantly accelerated.

[0021] 2. Optimize sludge morphology: Enhance the particulate components in the sludge, reduce the proportion of light sludge, and improve the overall quality and treatment efficiency of the sludge.

[0022] 3. Improved system stability: The microbial community structure was optimized, enhancing the system's resistance to shocks and its stability.

[0023] 4. Reduce sludge production: By inhibiting the growth of light sludge, the total amount of sludge produced is indirectly reduced, thereby lowering subsequent treatment costs.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 A process flow diagram of a method for enhancing sludge granulation in a continuous flow wastewater biological treatment system provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of a continuous flow wastewater biochemical treatment system provided in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of a sludge distribution pipe provided in an embodiment of the present invention. Figure 1 ;

[0029] Figure 4 A schematic diagram of a sludge distribution pipe provided in an embodiment of the present invention. Figure 2 ;

[0030] Figure 5 A cross-sectional view of the sludge distribution pipe provided in an embodiment of the present invention;

[0031] Figure 6 A partial schematic diagram of the sludge distribution pipe provided in an embodiment of the present invention. Figure 1 ;

[0032] Figure 7 A partial schematic diagram of the sludge distribution pipe provided in an embodiment of the present invention. Figure 2 ;

[0033] Figure 8 A partial schematic diagram of the sludge distribution pipe provided in an embodiment of the present invention. Figure 3 ;

[0034] Figure 9 This is a schematic diagram of the lower mud box provided in an embodiment of the present invention.

[0035] Icons: Biochemical tank 1; Stirring component 2; Baffle 3; Contact area 4; Purification area 5; Sewage distribution pipe 6; Sludge distribution pipe 7; First pipe 701; Second pipe 702; Upper sludge box 703; Lower sludge box 704; First sludge outlet 705; Second sludge outlet 706; Lower side plate 707; Longitudinal axis 708; Upper side plate 709; Tension spring 710; Top frame 711; Sliding connecting rod 712; Retaining ring 713; Outer rotating ring 714; Inclined stirring plate 715; Inner rotating ring 716; Movable rotating shaft 717; Multi-faceted shaft 718; Waterproof motor 719; Protective cover 720; L-shaped hanger 721; Ring frame 722; Sludge breaking rod 723; Compression spring 724; Friction wheel 725; Friction disc 726; Horizontal wheel shaft 727; Shaft seat 728; Spiral impeller 729; Rotating scraper 730. Detailed Implementation

[0036] To ensure a clear and complete description of the technical solutions in the embodiments of the present invention, which will be presented below with reference to the accompanying drawings, it is important to understand that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0038] Please refer to Example 1 Figures 1-9 The present invention provides a method for enhancing sludge granulation in a continuous flow wastewater biological treatment system, comprising the following steps:

[0039] Sewage and returned sludge are controlled to enter the biological treatment tank 1 of the continuous flow sewage biological treatment system. The horizontal height of the sewage inlet of the biological treatment tank 1 is lower than the horizontal height of the returned sludge inlet of the biological treatment tank 1.

[0040] The stirring component 2 is used to intermittently stir the sewage and return sludge entering the biological treatment tank 1, so that the sludge forms granular stratification. The heavy sludge obtained by granular stratification is deposited at the bottom of the biological treatment tank 1, and the light sludge obtained by granular stratification is deposited at the top of the biological treatment tank 1.

[0041] Wastewater entering biological treatment tank 1 through the wastewater inlet first comes into contact with heavy sludge. After the heavy sludge adsorbs suspended matter, dissolved organic matter and nutrients in the wastewater, the wastewater flows upward and is discharged through the outlet above biological treatment tank 1.

[0042] When the sewage and returned sludge enter the biological treatment tank 1 of the continuous flow sewage biological treatment system, a partition 3 is installed in the biological treatment tank 1 to divide the biological treatment tank 1 into a contact zone 4 and a purification zone 5 for influent treatment. The contact zone 4 and the purification zone 5 are connected by an outlet set on the partition 3. The contact zone 4 is connected to the sewage inlet and the returned sludge inlet. When the stirring component 2 is turned on, the heavy sludge is synchronously swirled and stirred. Under the driving force of the subsequently entering sewage and returned sludge, the heavy sludge is output from the outlet of the contact zone 4 to the purification zone 5.

[0043] The working principle and technical effects of the above technical solution are as follows:

[0044] In a method for enhancing sludge granulation in a continuous-flow wastewater biological treatment system, the present invention creates separation conditions for light and heavy sludge, and then preferentially provides nutrients from the wastewater for microbial growth to the heavy sludge, implementing a preferential feeding strategy for the heavy sludge. Specifically, a contact zone 4 is separated in the inlet section of the biological treatment tank 1, where wastewater and returned sludge come into contact. Intermittent stirring is performed by a stirring component 2, causing the returned sludge to form granular stratification. The heavy sludge obtained from granular stratification is deposited at the bottom of the biological treatment tank 1, and the light sludge obtained from granular stratification is deposited at the top. When the stirring component 2 is activated, the heavy sludge is simultaneously swirled and stirred, and then further stirred by the subsequent inflow of wastewater and returned sludge. Under the action of the process, heavy sludge is discharged from the outlet of contact zone 4 to purification zone 5. Due to its larger particle size, the heavy sludge has a higher settling velocity and settles at the bottom, while the light sludge has a smaller particle size and a lower settling velocity and settles at the top. When the sewage enters from the bottom of the contact zone, it first comes into contact with the heavy sludge at the bottom. The heavy sludge makes full use of the nutrients in the influent to grow. As the heavy sludge at the bottom continuously absorbs and utilizes the nutrients, the light sludge at the top is inhibited from growing because it is difficult to obtain enough nutrients. This promotes the granular growth and strengthening of the heavy sludge at the bottom and effectively inhibits the growth of light sludge, reducing the proportion of light sludge, indirectly reducing the total amount of sludge produced, improving the overall quality and treatment efficiency of the sludge, and reducing subsequent treatment costs.

[0045] The influent flow rate of wastewater is Q, and the return sludge flow rate is Q. 泥 Q 泥 =0.5-2.0Q; When sewage and returned sludge flow upward together, they form an upward velocity V, V=Q+Q 泥 / S, where S is the surface area of ​​contact zone 4. The wastewater inlet of biological treatment tank 1 is located at the bottom of one side of biological treatment tank 1, and the return sludge inlet of biological treatment tank 1 is located in the middle of one side of biological treatment tank 1. A wastewater distribution pipe 6 is installed at the wastewater inlet, allowing wastewater to enter the contact zone 4 of biological treatment tank 1 evenly from the bottom through multiple water distribution holes on the wastewater distribution pipe 6. The flow velocity of the water distribution holes is v1 = 1.0-2.5 m / h. A sludge distribution pipe 7 is installed at the return sludge inlet, allowing return sludge to enter the contact zone 4 of biological treatment tank 1 evenly from the middle through multiple sludge distribution holes on the sludge distribution pipe 7. The flow velocity of the sludge distribution holes is v2 = 1.0-2.5 m / h.

[0046] In this invention, contact zone 4 is part of the biological treatment tank 1, and is the area where sewage and returned sludge mix and react, typically for 1-2 hours. When the stirring component 2 is not stirring, the sludge particles form a stratified distribution due to differences in settling velocity. Heavy sludge has a high settling velocity and settles at the bottom of contact zone 4; light sludge has a low settling velocity, and some of it fails to settle due to the upward flow velocity and flows out of contact zone 4, while some may settle but remain above the heavy sludge. This creates a structure where the bottom layer is heavy sludge and the top layer is light sludge. Because the sewage distribution pipe 6 is located at the bottom of contact zone 4, the sewage, when evenly distributed through the sewage distribution pipe 6, preferentially contacts the bottom layer of heavy sludge. The heavy sludge utilizes the sewage... The nutrients in the sludge promote the granulation of heavy sludge, while the light sludge in the upper layer is inhibited due to lack of nutrients. When sludge settles for a long time, the upward flow velocity of the water is limited and insufficient to fluidize the sludge, which will cause sludge caking. The stirring component 2 needs to be turned on to disperse the sludge and prevent caking. When the stirring component 2 is turned on, the heavy sludge (the sludge that increases granulation) is also stirred. Under the driving force of the influent and sludge, the heavy sludge also flows out of the outlet of the contact zone 4 and flows to the subsequent stage of the biological treatment tank, thereby exerting the synergistic effect of granular sludge.

[0047] Please refer to Example 2 Figures 1-9 In the method for enhancing sludge granulation in a continuous flow wastewater biological treatment system, the continuous flow wastewater biological treatment system includes: a biological tank 1, a wastewater inlet at the bottom of the biological tank 1, a return sludge inlet on the side of the biological tank 1, a stirring component 2 inside the biological tank 1, the stirring component 2 being located between the wastewater inlet and the return sludge inlet; and a sludge distribution pipe 7 installed at the return sludge inlet.

[0048] The working principle and technical effects of the above technical solution are as follows:

[0049] This invention discloses a method for enhancing sludge granulation in a continuous flow wastewater biological treatment system. Applied to the aforementioned continuous flow wastewater biological treatment system, wastewater and returned sludge enter the biological treatment tank 1 through the wastewater inlet and returned sludge inlet, respectively, and undergo mixing and reaction within the tank. Intermittent stirring by a stirring component 2 causes the returned sludge to form granular stratification. The heavy sludge resulting from granular stratification is deposited at the bottom of the biological treatment tank 1, while the light sludge is deposited at the top. When the stirring component 2 is activated, the heavy sludge is simultaneously swirled and stirred. Driven by the subsequently entering wastewater and returned sludge, the heavy sludge is discharged from the outlet of the contact zone 4 to the purification zone 5. Through intermittent stirring and bottom-inlet strategies, the sludge particle formation process is accelerated, the proportion of light sludge is reduced, the overall sludge quality and treatment efficiency are improved, and subsequent treatment costs are reduced.

[0050] Please refer to Example 3 Figures 1-9 To further improve the mixing and reaction effect of wastewater and returned sludge, a sludge distribution pipe 7 is installed in the continuous flow wastewater biological treatment system to ensure that the returned sludge is evenly transported to the contact zone 4. The sludge distribution pipe 7 includes: a first pipe 701 fixed inside the returned sludge inlet; the first pipe 701 is inserted into the inner side of one end of the biological treatment tank 1 and slidably connected to one end of a second pipe 702; the other end of the second pipe 702 is fixed to the sludge inlet of the upper sludge distribution box 703; the lower sludge distribution box 704, which is open at the top, is slidably connected to the bottom opening of the upper sludge distribution box 703; and a plurality of first sludge outlet holes 70 are evenly arranged on the bottom surface of the lower sludge distribution box 704. 5. Multiple second mud outlet holes 706 are evenly arranged around the side of the lower mud distribution box 704. When the lower mud distribution box 704 slides downward in the upper mud distribution box 703, the diameter of the second mud outlet holes 706 gradually increases. A longitudinal shaft 708 is fixed on the lower side plate 707 of the lower mud distribution box 704. The middle part of the longitudinal shaft 708 is slidably connected to the upper side plate 709 of the upper mud distribution box 703. A tension spring 710 is fixed between the upper side plate 709 and the lower side plate 707. A top frame 711 fixed on the longitudinal shaft 708 is located above the first pipe 701. The top frame 711 is rotatably connected to one end of the sliding connecting rod 712, and the other end of the sliding connecting rod 712 is rotatably connected to the first pipe 701.

[0051] The working principle and technical effects of the above technical solution are as follows:

[0052] The first pipe 701 is fixed inside the return sludge inlet. The outer end of the first pipe 701 is connected to the sludge inlet pipe equipped with a sludge pump. The return sludge enters the second pipe 702 through the first pipe 701, and then enters the return sludge transfer zone formed between the upper sludge box 703 and the lower sludge box 704 through the second pipe 702. The sludge in the return sludge transfer zone can be discharged through multiple first sludge outlet holes 705 on the bottom surface of the lower sludge box 704 and multiple second sludge outlet holes 706 on the side of the lower sludge box 704, thereby uniformly transporting it to the contact area 4, effectively dispersing the return sludge, and improving the contact reaction effect between the return sludge and the sewage. The lower sludge box 704 is sealed and slidably connected to the bottom opening of the upper sludge box 703. Under normal conditions, the lower sludge box... The opening size of the multiple second sludge outlet holes 706 on the side of the 704 is relatively small. When the multiple first sludge outlet holes 705 on the bottom surface of the lower sludge box 704 are blocked, or when the amount of return sludge in the return sludge transfer zone exceeds the preset amount, the lower sludge box 704 slides downward under the gravity of the return sludge. This increases the capacity of the return sludge transfer zone formed between the upper sludge box 703 and the lower sludge box 704. Furthermore, as the lower sludge box 704 slides downward within the upper sludge box 703, the diameter of the second sludge outlet holes 706 gradually increases, facilitating the effective discharge of more return sludge, ensuring output efficiency, and reducing the problem of poor mixing reaction caused by blockage of the multiple first sludge outlet holes 705 on the bottom surface of the lower sludge box 704. This effectively ensures the amount of return sludge reacting with the wastewater. When the mud box 704 slides downward, the lower mud box 704 drives the lower side plate 707 to move downward. The lower side plate 707 drives the longitudinal shaft 708 to slide downward on the upper side plate 709 and stretches the tension spring 710. When the return sludge between the upper mud box 703 and the lower mud box 704 is discharged to restore the preset amount, the lower side plate 707 returns to its original position under the elastic force of the tension spring 710, thereby driving the lower mud box 704 to slide upward and reset within the upper mud box 703. When the longitudinal shaft 708 slides downward on the upper side plate 709, it can drive the top frame 711 to move downward. The top frame 711 is rotatably connected to one end of the sliding connecting rod 712, thereby driving one end of the sliding connecting rod 712 to move downward. At this time, the other end of the sliding connecting rod 712 is connected to the first pipe 701. The angle between the two pipes decreases, causing the second pipe 702 to move away from the first pipe 701. This not only increases the overall length of the pipeline formed by the first pipe 701 and the second pipe 702, providing a buffer when a large amount of sludge is discharged from the upper sludge box 703 and the lower sludge box 704, but also allows the return sludge to travel a longer path in the first pipe 701 and the second pipe 702, ensuring effective sludge output from the upper sludge box 703 and the lower sludge box 704. Furthermore, as the second pipe 702 slides away from the first pipe 701, it also drives the upper sludge box 703 and the lower sludge box 704 to move within the contact area 4, changing the positions of the multiple first sludge outlet holes 705 and the multiple second sludge outlet holes 706, thereby adjusting the sludge discharge position.This helps to further improve the uniformity of the sludge, thereby enhancing the contact effect between the returned sludge and the wastewater.

[0053] In this invention, the structure of the sludge distribution pipe 7 allows the continuous flow wastewater biological treatment system to automatically adjust according to changes in the amount of returned sludge. When the first sludge outlet 705 on the bottom surface of the lower sludge distribution box 704 is blocked or the amount of returned sludge exceeds a preset amount, the lower sludge distribution box 704 will slide downwards under gravity, changing the capacity of the returned sludge transfer zone and the diameter of the second sludge outlet 706. This allows the system to adapt to different operating conditions, reducing manual intervention and improving the stability of the entire wastewater treatment system. When the returned sludge is discharged to the preset amount, the tension spring 710 can drive the lower sludge distribution box 704 to slide upwards and reset, ensuring that the system can return to normal operation under different conditions and enhancing the reliability of the system. Blockage of the first sludge outlet 705 is a common equipment failure. In this technical solution, the sliding of the lower sludge distribution box 704 and the change in the diameter of the second sludge outlet 706 can alleviate the impact of blockage of the first sludge outlet 705 to a certain extent, avoiding the failure of the entire sludge conveying and mixing system due to local blockage and reducing the impact of equipment failure on the wastewater treatment effect.

[0054] When the second pipe 702 moves away from the first pipe 701, it increases the overall length of the pipeline formed by the first pipe 701 and the second pipe 702. This lengthens the path of the returned sludge within the pipeline, increasing the residence time of the sludge. This facilitates further mixing and homogenization of the sludge within the pipeline, improving the quality of the sludge before it enters the upper sludge box 703 and the lower sludge box 704, thereby enhancing the subsequent reaction with the wastewater. The sliding of the second pipe 702 causes the upper sludge box 703 and the lower sludge box 704 to move within the contact area 4, changing the positions of the first sludge outlet 705 and the second sludge outlet 706. This dynamic adjustment of the sludge outlet position prevents localized accumulation of sludge within the contact area 4, allowing the sludge to be more evenly dispersed within the contact area 4. This further improves the uniformity of the sludge distribution, significantly enhancing the contact effect between the returned sludge and the wastewater, and improving wastewater treatment efficiency.

[0055] Furthermore, the increased overall length of the first pipe 701 and the second pipe 702 acts as a buffer when a large amount of sludge is discharged from the upper sludge box 703 and the lower sludge box 704, reducing the instantaneous impact force of the sludge on the pipes and sludge boxes, lowering the risk of equipment damage due to excessive impact force, and extending the service life of the pipes, sludge boxes, and other equipment. The tension spring 710 not only realizes the reset function of the lower sludge box 704, but also buffers the impact force during the up-and-down sliding process of the lower sludge box 704 to a certain extent, protecting the lower sludge box 704 and its connecting parts, reducing mechanical wear, and helping to extend the service life of related components.

[0056] The sludge distribution pipe 7 further includes: two upper and lower retaining rings 713 fixedly connected to the inner wall of the upper sludge distribution box 703; an outer rotating ring 714 rotatably connected within the annular groove formed between the two retaining rings 713; multiple inclined stirring plates 715 uniformly fixed around the inner side of the outer rotating ring 714; the inner ends of the multiple inclined stirring plates 715 fixedly connected to the outer side of the inner rotating ring 716; a movable rotating shaft 717 slidably connected within the central hole of the inner rotating ring 716; and the protrusions on the inner side of the inner rotating ring 716 slidably engaging with the movable rotating shaft. In the axial groove of the side wall of 717, the bottom of the movable shaft 717 is sealed and rotatably connected to the bottom surface of the lower mud box 704, and the top of the middle part of the movable shaft 717 is sealed and rotatably connected to the circular through hole on the top surface of the upper mud box 703. One end of the movable shaft 717 that extends to the top surface of the upper mud box 703 is provided with a multi-faceted groove. The multi-faceted shaft 718 that is slidably connected in the multi-faceted groove is connected to the output shaft of the waterproof motor 719. The waterproof motor 719 is installed in the protective cover 720 on the upper surface of the upper mud box 703.

[0057] The working principle and technical effects of the above technical solution are as follows:

[0058] When the waterproof motor 719 starts, it drives the polygonal shaft 718 to rotate. The rotation of the polygonal shaft 718, through its engagement with the polygonal groove, drives the movable shaft 717 to rotate. The rotation of the movable shaft 717, through the engagement of the axial groove and the protruding ridge, drives the inner rotating ring 716 to rotate. The rotation of the inner rotating ring 716 drives the multiple inclined stirring plates 715 to rotate, thereby stirring the returned sludge, improving the dispersion effect of the returned sludge, and reducing the probability of clogging caused by sludge agglomeration. The rotation of the multiple inclined stirring plates 715 drives the outer rotating ring 714 to rotate within the annular groove formed between the two retaining rings 713. The two retaining rings 713 act as blocking and limiting elements, ensuring the proper positioning of the stirring structure formed by the inner rotating ring 716, the multiple inclined stirring plates 715, and the outer rotating ring 714. To ensure stability, multiple rotating scrapers 730 fixedly connected to the movable shaft 717 slide against the bottom surface of the lower sludge box 704, thereby scraping the return sludge on the bottom surface of the lower sludge box 704, preventing the return sludge from accumulating on the bottom surface of the lower sludge box 704, and improving the discharge effect of the return sludge. The bottom of the movable shaft 717 is sealed and rotatably connected to the bottom surface of the lower sludge box 704, so that the movable shaft 717 can move with the movement of the lower sludge box 704. When the lower sludge box 704 moves downward, it can drive the movable shaft 717 downward. At this time, the position of the multi-faceted shaft 718 inserted into the multi-faceted groove of the movable shaft 717 is changed, but it does not affect the rotation of the movable shaft 717 driven by the multi-faceted shaft 718, ensuring the stability of the stirring.

[0059] The upper mud-distributing box 703 is fixedly connected to the upper end of an L-shaped hanger 721 on its side wall. The lower end of the L-shaped hanger 721 is fixedly connected to an annular frame 722. Multiple mud-breaking rods 723 are fixedly connected to the annular frame 722. The multiple mud-breaking rods 723 are arranged opposite to multiple first mud outlet holes 705 one by one. The diameter of the mud-breaking rod 723 is smaller than the diameter of the first mud outlet hole 705, and the height of the mud-breaking rod 723 is not greater than the depth of the first mud outlet hole 705. When the lower mud-distributing box 704 slides downward to a preset distance in the upper mud-distributing box 703, the multiple mud-breaking rods 723 gradually insert into the multiple first mud outlet holes 705. A compression spring 724 is fixedly connected between the lower surface of the upper mud-distributing box 703 and the horizontal plate of the L-shaped hanger 721. The top of the mud-breaking rod 723 has a conical tip structure.

[0060] The working principle and technical effect of the above technical solution are as follows: Multiple sludge breaking rods 723 are arranged one-to-one with multiple first sludge outlet holes 705, located directly below the multiple first sludge outlet holes 705. The top of the sludge breaking rod 723 has a conical tip structure, which can further divert and disperse the return sludge output through the multiple first sludge outlet holes 705, thereby improving the dispersion effect. When the first sludge outlet hole 705 on the bottom surface of the lower sludge distribution box 704 is blocked or the amount of return sludge is greater than the preset amount, the lower sludge distribution box 704 will slide down to the preset distance under the action of gravity, and the multiple sludge breaking rods 723 can be gradually inserted into the multiple first sludge outlet holes 705, thereby clearing the blocked first sludge outlet holes 705. A compression spring 724 is fixed between the lower surface of the upper sludge distribution box 703 and the horizontal plate of the L-shaped hanger 721, which facilitates the improvement of the reset effect of the lower sludge distribution box 704.

[0061] The conical tip of the sludge-breaking rod 723 effectively cuts and diverts the sludge as it exits through the first sludge outlet 705. This diversion effect results in a wider and more uniform distribution of sludge within the contact area 4, further increasing the contact area between the returned sludge and wastewater. This significantly improves the mixing and reaction effect of the sludge and wastewater, contributing to more efficient wastewater treatment. Because multiple sludge-breaking rods 723 are arranged one-to-one with multiple first sludge outlets 705, the sludge discharged from each first sludge outlet 705 can be specifically dispersed, ensuring the consistency and uniformity of sludge dispersion throughout the sludge outlet area and avoiding the problem of localized sludge concentration affecting the treatment effect. During normal sludge output, the sludge-breaking rod 723... The sludge diversion function can break up any potential agglomeration within the sludge, allowing it to enter the contact zone in the form of finer particles or flocs. This finer sludge morphology enhances the sludge's activity and reactivity, promoting full contact and reaction between microorganisms in the sludge and pollutants in the wastewater, thereby improving wastewater treatment quality. The diameter of the sludge breaking rod 723 is smaller than the diameter of the first sludge outlet hole 705, and its height is no greater than the depth of the first sludge outlet hole 705. This design ensures that the sludge breaking rod 723 can be smoothly inserted into the first sludge outlet hole 705 for unblocking without damaging it, thus extending the service life of the lower sludge distribution box 704.

[0062] The friction wheel 725 fixed on the movable rotating shaft 717 is vertically frictionally connected to the friction disc 726. The friction disc 726 is fixed on the horizontal wheel shaft 727. The horizontal wheel shaft 727 is rotatably connected to the top surface inside the upper mud box 703 through the bearing seat 728. The spiral impeller 729 fixed on the horizontal wheel shaft 727 is rotatably connected inside the second pipe 702. The friction wheel 725 is located between the inner rotating ring 716 and the horizontal wheel shaft 727.

[0063] The working principle and technical effect of the above technical solution are as follows: In order to further improve the flow effect of the returned sludge and reduce the probability of blockage in the second pipe 702, a spiral impeller 729 is also rotatably installed in the second pipe 702. When the movable shaft 717 rotates, it drives the friction wheel 725 to rotate. When the friction wheel 725 rotates, it drives the friction disc 726 to rotate vertically. When the friction disc 726 rotates, it drives the horizontal wheel shaft 727 and the spiral impeller 729 on the horizontal wheel shaft 727 to rotate. When the spiral impeller 729 rotates, it can transport the returned sludge in the second pipe 702 to the upward sludge distribution box 703, thereby improving the conveying effect of the returned sludge and reducing the probability of blockage. Furthermore, since the friction wheel 725 is located between the inner rotating ring 716 and the horizontal wheel shaft 727, when there is a large amount of sludge in the upper sludge box 703 and the lower sludge box 704, causing the lower sludge box 704 to move downwards and drive the movable rotating shaft 717 downwards, the friction wheel 725 gradually moves downwards away from the horizontal wheel shaft 727, that is, away from the axis of the friction disc 726. This reduces the number of rotations of the friction disc 726 per revolution of the friction wheel 725, thereby reducing the rotational speed of the spiral impeller 729 and the conveying capacity. This is beneficial for better sludge output from the upper sludge box 703 and the lower sludge box 704, and has a dynamic adjustment function based on the amount of sludge. The sludge conveying capacity in the lower sludge distribution box 704 is adjusted in real time to avoid sludge accumulation in the box due to excessive conveying capacity. This facilitates better sludge output from the box and ensures the stability and efficiency of the entire sludge conveying and treatment system. This adaptive adjustment function enables the system to better adapt to changes in sludge volume under different operating conditions without frequent manual intervention and adjustment. This improves the flexibility and intelligence of the system operation and reduces manual operation costs and the possibility of errors.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for enhancing sludge granulation in a continuous flow wastewater biological treatment system, characterized in that, Includes the following steps: Sewage and returned sludge are controlled to enter the biological treatment tank of the continuous flow sewage biological treatment system, and the horizontal height of the sewage inlet of the biological treatment tank is lower than the horizontal height of the returned sludge inlet of the biological treatment tank. The stirring components are controlled to intermittently stir the sewage and return sludge entering the biological treatment tank, so that the sludge forms granular stratification. The heavy sludge obtained from granular stratification is deposited at the bottom of the biological treatment tank, and the light sludge obtained from granular stratification is deposited at the top of the biological treatment tank. Wastewater entering the biological treatment tank through the wastewater inlet first comes into contact with heavy sludge. After the heavy sludge adsorbs suspended solids, dissolved organic matter and nutrients in the wastewater, the wastewater flows upward and is discharged through the outlet at the top of the biological treatment tank. The wastewater inlet of the biological treatment tank is located at the bottom of one side of the biological treatment tank, and the sludge return inlet of the biological treatment tank is located in the middle of one side of the biological treatment tank. When wastewater and returned sludge enter the biological treatment tank of the continuous flow wastewater biological treatment system, a baffle is installed in the biological treatment tank to divide it into a contact zone and a purification zone for influent treatment. The contact zone and the purification zone are connected by an outlet set on the baffle. The contact zone is connected to the wastewater inlet and the returned sludge inlet. When the stirring component is turned on, the heavy sludge is synchronously swirled and stirred. Under the driving force of the subsequently entering wastewater and returned sludge, the heavy sludge is discharged from the outlet of the contact zone to the purification zone. A sludge distribution pipe is installed at the sludge inlet, so that the sludge is evenly introduced into the contact zone from the middle of the biological tank through multiple sludge distribution holes on the sludge distribution pipe. The continuous flow wastewater biological treatment system includes: a biological tank, a wastewater inlet at the bottom of the biological tank, a return sludge inlet on the side of the biological tank, a stirring component inside the biological tank, the stirring component being located between the wastewater inlet and the return sludge inlet; and a sludge distribution pipe installed at the return sludge inlet. The sludge distribution pipe includes: a first pipe fixed inside the return sludge inlet; the first pipe is inserted into the inner side of the biological treatment tank and slidably connected to one end of a second pipe; the other end of the second pipe is fixed to the sludge inlet of the upper sludge distribution box; the lower sludge distribution box, which is open at the top, is slidably connected to the bottom opening of the upper sludge distribution box; multiple first sludge outlet holes are evenly arranged on the bottom surface of the lower sludge distribution box; multiple second sludge outlet holes are evenly arranged around the side of the lower sludge distribution box; as the lower sludge distribution box slides downward inside the upper sludge distribution box, the diameter of the second sludge outlet holes gradually increases; a longitudinal shaft is fixed on the lower side plate of the lower sludge distribution box; the middle part of the longitudinal shaft is slidably connected to the upper side plate of the upper sludge distribution box; a tension spring is fixed between the upper and lower side plates; a top frame fixed on the longitudinal shaft is located above the first pipe; the top frame is rotatably connected to one end of a sliding connecting rod; and the other end of the sliding connecting rod is rotatably connected to the first pipe. The sludge distribution pipe further includes: two upper and lower retaining rings fixedly connected to the inner wall of the upper sludge distribution box; an outer rotating ring rotatably connected in the annular groove formed between the two retaining rings; multiple inclined stirring plates evenly fixed around the inner side of the outer rotating ring; the inner ends of the multiple inclined stirring plates fixed to the outer side of the inner rotating ring; a movable rotating shaft slidably connected in the central hole of the inner rotating ring; the protruding ridges on the inner side of the inner rotating ring slidably fitted in the axial groove of the side wall of the movable rotating shaft; the bottom of the movable rotating shaft is sealed and rotatably connected to the bottom surface of the lower sludge distribution box; the top of the middle part of the movable rotating shaft is sealed and movably connected to the circular through hole on the top surface of the upper sludge distribution box; one end of the movable rotating shaft that extends to the top surface of the upper sludge distribution box is provided with a multi-faceted groove; the multi-faceted shaft slidably connected in the multi-faceted groove is connected to the output shaft of a waterproof motor; and the waterproof motor is installed in the protective cover on the upper surface of the upper sludge distribution box. The upper mud distribution box is fixedly connected to the upper end of an L-shaped hanger on its side wall, and the lower end of the L-shaped hanger is fixedly connected to a ring frame. Multiple mud-breaking rods are fixedly connected to the ring frame, and the multiple mud-breaking rods are arranged opposite to multiple first mud outlet holes one by one. The diameter of the mud-breaking rod is smaller than the diameter of the first mud outlet hole, and the height of the mud-breaking rod is not greater than the depth of the first mud outlet hole. When the lower mud distribution box slides down to a preset distance in the upper mud distribution box, the multiple mud-breaking rods gradually insert into the multiple first mud outlet holes. A compression spring is fixed between the lower surface of the upper mud distribution box and the horizontal plate of the L-shaped hanger. The top of the mud-breaking rod has a conical tip structure. The friction wheel fixed on the movable rotating shaft is vertically frictionally connected to the friction disc. The friction disc is fixed on the horizontal wheel shaft. The horizontal wheel shaft is rotatably connected to the top surface inside the upper mud box through a shaft seat. The spiral impeller fixed on the horizontal wheel shaft is rotatably connected inside the second pipe. The friction wheel is located between the inner rotating ring and the horizontal wheel shaft.

2. The method for enhancing sludge granulation in a continuous flow wastewater biological treatment system according to claim 1, characterized in that, The influent flow rate of wastewater is Q, and the return sludge flow rate is Q. 泥 Q 泥 = (0.5-2.0)Q; When sewage and returned sludge flow upward together, they form an upward velocity V, where V = (Q + Q). 泥 ) / S, where S is the surface area of ​​the contact area.

3. The method for enhancing sludge granulation in a continuous flow wastewater biological treatment system according to claim 2, characterized in that, A sewage distribution pipe is installed at the sewage inlet, allowing sewage to enter the contact area of ​​the biological treatment tank evenly from the bottom through multiple water distribution holes on the sewage distribution pipe.

4. A method for enhancing sludge granulation in a continuous flow wastewater biological treatment system according to claim 3, characterized in that, The flow velocity at the water distribution hole is v1 = 1.0-2.5 m / h.

5. A method for enhancing sludge granulation in a continuous flow wastewater biological treatment system according to claim 1, characterized in that, The flow velocity at the mud-covering orifice is v2 = 1.0-2.5 m / h.

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