A sewage treatment system and a sewage treatment method

Abstract

The present application relates to the technical field of sewage treatment, and discloses a sewage treatment system and a sewage treatment method, wherein the sewage treatment system comprises a tank body, further comprises a slag scraping assembly, the slag scraping assembly comprises a rotating shaft arranged on the axis of the tank body, a connecting plate arranged at the top of the rotating shaft, a plurality of supporting rods arranged in a circular array on the connecting plate, and slag scraping strips arranged on the supporting rods, a plurality of slag collecting shells are arranged at the top of the inner cavity of the tank body, the number of the supporting rods is the same as that of the slag collecting shells, the slag collecting shells have an open side wall, and the slag collecting shells are provided with gaps through which the slag scraping strips rotate. During the rotation of the slag scraping strips, the volume of the slag scraping strips and the slag collecting shells for surrounding and blocking the floating slag is continuously reduced, and then the floating slag is removed to the clamping cavity, which not only can improve the collection efficiency and concentration effect of the floating slag, but also can reduce the interference of the floating slag on the treatment capacity of the air flotation tank, and is an important innovation achievement in the field of environmental governance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and in particular to a sewage treatment system and a sewage treatment method. BACKGROUND

[0002] As an important innovation in the field of environmental governance, the multi-stage air flotation cooperative sewage treatment technology has significant value in realizing the resource utilization of sewage. The device system integrates pressure dissolved gas release devices, micro-nano bubble generators and other core technology modules to build a multi-stage cooperative treatment system of "physical separation-chemical flocculation-biological degradation". At the process implementation level, first, the high-efficiency dissolved gas system generates micro-bubble groups with a particle size of 20-50 μm, which realizes the primary capture of suspended solids, emulsified oil and colloidal particles through surface adsorption; then, the pH adjusting unit activates the activity of the flocculant to form dense flocs for secondary enrichment; finally, the biochemical treatment module can mineralize dissolved organic matter in depth to form a complete sewage treatment closed loop.

[0003] In the patent with the patent number CN110902746A, a sewage treatment air flotation machine is disclosed, which includes a shell, a stirring assembly and a slag scraping assembly. The shell is vertically upwardly arranged, and the inner cavity of the shell is divided into a mixing chamber and a separation chamber from bottom to top. The top of the mixing chamber is provided with a flow guide chamber communicated therewith, and the bottom of the flow guide chamber is communicated with the separation chamber. The side wall of the shell near the bottom is provided with a water inlet pipe, and the side corresponding to the water inlet pipe is provided with a dissolved gas tank. The output end of the dissolved gas tank is arranged in the gas outlet pipe. The stirring assembly is vertically arranged in the mixing chamber and extends into the flow guide chamber. The stirring assembly can mix the sewage and bubbles entering the mixing chamber and guide the mixed liquid into the separation chamber. The slag scraping assembly is arranged on the stirring assembly and located in the cavity of the shell and close to the bottom cover of the shell. The slag scraping assembly can push the floating dregs out of the shell from the periphery of the bottom of the shell.

[0004] The existing technology has the following defects:

[0005] The existing air flotation sewage treatment machine slag scraping system only scrapes the floating dregs on the surface of the sewage. Insufficient scraping depth can cause many disadvantages and problems, mainly in the following aspects:

[0006] 1. The treatment effect is reduced

[0007] Residual suspended solids: Insufficient scraping depth causes part of the floating dregs to be not removed, and the suspended solids content in the effluent increases, affecting the water quality.

[0008] Increased turbidity: The unscraped floating dregs are suspended in the water, causing the turbidity of the water to increase, and the subsequent treatment unit may not operate normally.

[0009] Contaminant removal rate decreases: the overall removal efficiency of the system decreases, failing to meet the expected treatment target.

[0010] 2. Equipment efficiency decreases

[0011] Air floatation efficiency is hindered: scum retention covers the water surface, interfering with the generation and floating process of bubbles, and the efficiency of air floatation separation decreases significantly.

[0012] Increased operating energy consumption: due to the decrease in treatment efficiency, the operating time needs to be extended or the operating load needs to be increased, resulting in increased energy consumption.

[0013] System operation is unstable: the scum scraping system does not operate sufficiently, which can cause frequent abnormalities or efficiency fluctuations of the equipment.

[0014] 3. Increased difficulty of equipment maintenance

[0015] Scum accumulation: unscraped scum accumulates for a long time, which can block the scum scraper or other components, increasing the frequency of maintenance.

[0016] Increased equipment wear and tear: the residual scum contains corrosive components, and long-term retention can cause corrosion or damage to equipment parts.

[0017] Increased maintenance costs: the equipment failure rate increases, which increases the frequency of replacement of spare parts and the cost of maintenance.

[0018] The insufficient scraping depth of the scum scraping system not only directly affects the treatment effect of the air floatation sewage treatment machine, but also causes a series of problems such as equipment efficiency decrease, operating cost increase, and environmental pollution aggravation. SUMMARY

[0019] In view of the above problems existing in the prior art, a sewage treatment system and a sewage treatment method are provided.

[0020] In one aspect of the present application, a sewage treatment system is provided, which aims to improve the working efficiency of the scum discharge assembly and improve the sewage treatment efficiency.

[0021] The technical scheme of the present application is: a sewage treatment system, comprising a tank body, a partition plate is arranged at the bottom of the tank body, which divides the tank body into upper and lower parts, an annular plate is arranged above the partition plate, which divides the upper part of the tank body into an inner cavity and a clamping cavity, a dissolved gas pipe is arranged at the bottom of the tank body, which communicates with the inner cavity of the tank body, a sewage discharge pipe is arranged at the lower part of the tank body, which communicates with the clamping cavity of the tank body, a water inlet pipe is arranged at the middle part of the tank body, which communicates with the inner cavity of the tank body, and a water outlet pipe is arranged at the bottom of the tank body, which communicates with the inner cavity of the tank body.

[0022] The slag scraping assembly comprises a rotating shaft arranged on the tank axis, a connecting plate arranged on the top of the rotating shaft, a plurality of supporting rods arranged on the connecting plate in a circular array, and a plurality of slag scraping strips arranged on the supporting rods.

[0023] The driving assembly is arranged to drive the rotating shaft to rotate.

[0024] According to the above scheme, by arranging the slag scraping assembly, the volume of the floating slag surrounded by the slag scraping strips and the slag collecting shells is continuously reduced during the rotation of the slag scraping strips, and then the floating slag is removed into the clamping cavity. By arranging the gradually reduced surrounding volume, the collection efficiency and concentration effect of the floating slag can be improved, the interference of the floating slag on the treatment capacity of the air flotation tank can be reduced, the process flow can be optimized, the size of the slag scraping equipment can be reduced, and the equipment management is facilitated. This design has important advantages in terms of operation efficiency, equipment protection, and maintenance cost.

[0025] Further, the slag collecting shell is provided with an overflow weir one near the annular plate and at the position of the side wall angle, and the annular plate is provided with an overflow weir two corresponding to the position of the overflow weir one.

[0026] According to the above scheme, by arranging the overflow weir one and the overflow weir two, the floating slag surrounded by the slag scraping strips and the slag collecting shells can be easily discharged.

[0027] Further, the bottom surface of the slag collecting shell is continuously raised from the opening of the side wall to the direction of the overflow weir one.

[0028] According to the above scheme, by the above arrangement, the volume of the floating slag surrounded by the slag scraping strips and the slag collecting shells is further reduced during the rotation of the slag scraping strips, and the slag collecting effect of the slag scraping assembly is enhanced.

[0029] Further, the slag scraping strip is curved towards the rotation direction of the supporting rod.

[0030] According to the above scheme, by the above arrangement, the slag scraping strip can capture the floating slag at a certain depth below the water surface during the rotation of the slag scraping strip, and the slag collecting effect of the slag scraping assembly is enhanced.

[0031] Further, the clamping cavity is provided with an annular flow guide plate, the top surface of the annular flow guide plate is a slope, the bottom surface of the annular flow guide plate is attached to the partition plate, and the lowest point of the slope is connected to the blow-off pipe.

[0032] According to the above scheme, by arranging the annular flow guide plate with the sloping top surface, the floating slag can be quickly discharged to the blow-off pipe.

[0033] Further, the driving assembly comprises a driving motor arranged below the partition plate, a gearbox connected with the driving motor, a wheel disc I arranged on an output shaft of the gearbox, and a wheel disc II arranged on the rotating shaft, and the wheel disc I and the wheel disc II are connected through a belt transmission.

[0034] By the above scheme, the rotating shaft is driven to rotate through the driving assembly.

[0035] Further, the air dissolving and releasing assembly comprises a connecting shell arranged on the shaft wall of the rotating shaft, a plurality of rotating arms arranged on the connecting shell, and a plurality of air dissolving and releasing holes arranged on the rotating arms, the lower end of the rotating shaft is a cavity, the cavity is communicated with the connecting shell, the connecting shell is communicated with the rotating arms, and the air dissolving pipe is rotatably connected with the bottom end of the rotating shaft.

[0036] By the above scheme, the rotating arms are arranged in the air dissolving and releasing system of the air flotation sewage treatment machine, and the design of dynamic air dissolving and releasing when the rotating arms rotate significantly improves the treatment efficiency and system reliability. The advantages of this design include: improving the adhesion probability of bubbles and impurities, enhancing system stability, uniform water flow distribution, reducing blockage, flexible adaptation to different working conditions, and optimizing energy consumption, etc., so that the rotating arms become an important part of modern air flotation technology and have wide application value in the water treatment industry.

[0037] Further, a sealing member I is arranged at the connecting position of the air dissolving pipe and the rotating shaft, and a sealing member II is arranged at the connecting position of the rotating shaft and the partition plate.

[0038] By the above arrangement, the sealing performance of the rotating shaft during rotation is ensured.

[0039] Further, the application further provides a sewage treatment method using the sewage treatment system, comprising the following steps,

[0040] Step one: start the equipment, turn on the power supply, ensure that the power supply is stable, press the switch to start the equipment, check whether the equipment is running normally, whether the air flotation machine is in a stable working state, and whether the driving motor drives the rotating shaft to rotate;

[0041] Step two: adjust the parameters, adjust the gas flow, adjust the gas flow valve according to the water quality demand to control the gas injection amount, ensure that the gas is injected in an appropriate amount, adjust the water inflow through the water inflow valve to control the water inflow of the water inflow pipe, and keep the water level from overflowing outside the overflow weir I;

[0042] Step three: observe the running state, observe the water quality change and bubble generation in the tank body, and judge whether the treatment effect meets the expectation;

[0043] Step four: according to the running condition, clean the suspended matter in the tank body regularly, prevent the equipment from being blocked.

[0044] The beneficial effects of the present application are:

[0045] By setting the slag scraping assembly, the volume of the floating slag enclosed by the slag scraping strip and the slag collecting shell is continuously reduced during the rotation of the slag scraping strip, and then the floating slag is removed to the clamping cavity. By setting the gradually reduced enclosure, the collection efficiency and concentration effect of the floating slag can be improved, the interference of the floating slag on the treatment capacity of the air flotation tank can be reduced, the process flow can be optimized, the size of the slag scraping equipment can be reduced, and the equipment management is facilitated. This design has important advantages in terms of operation efficiency, equipment protection and maintenance cost.

[0046] By setting the dissolved gas release assembly, the rotating arm is in the dissolved gas release system of the air flotation sewage treatment machine. Through the design of dynamic release of dissolved gas during rotation of the rotating arm, the treatment efficiency and system reliability are significantly improved. The advantages of this design include: improving the adhesion probability of bubbles and impurities, enhancing system stability, uniform water flow distribution, reducing blockage, flexible adaptation to different working conditions, and optimizing energy consumption, etc. The rotating arm becomes an important part of modern air flotation technology and has wide application value in the water treatment industry. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 It is a perspective view of the sewage treatment system of the present application;

[0048] Figure 2 It is a top view of the sewage treatment system of the present application;

[0049] Figure 3 It is a Figure 2 sectional view at A-A;

[0050] Figure 4 It is a perspective view of the hidden tank body of the sewage treatment system of the present application;

[0051] Figure 5 It is a Figure 4 perspective view of the hidden annular plate of the present application;

[0052] Figure 6 It is a perspective view of the slag collecting shell in the sewage treatment system of the present application;

[0053] Figure 7 It is a perspective view of the support rod and the slag scraping strip in the sewage treatment system of the present application;

[0054] Figure 8 It is an exploded view of the slag scraping assembly in the sewage treatment system of the present application;

[0055] Figure 9 It is a Figure 4 top view of the present application;

[0056] Figure 10 isometric view of the dissolved air releasing component of the sewage treatment system of the present application;

[0057] Figure 11 isometric view of the dissolved air releasing component of the sewage treatment system of the present application; Figure 10 isometric view of the dissolved air releasing component of the sewage treatment system of the present application;

[0058] Figure 12 isometric view of the dissolved air releasing component of the sewage treatment system of the present application; Figure 11 isometric view of the dissolved air releasing component of the sewage treatment system of the present application.

[0059] isometric view of the dissolved air releasing component of the sewage treatment system of the present application.

[0060] 1, tank; 2, partition; 3, annular plate; 4, dissolved air pipe; 5, blowdown pipe; 6, water inlet pipe; 7, water outlet pipe; 8, rotating shaft; 9, connecting plate; 10, support rod; 11, slag scraping strip; 12, slag collecting shell; 13, gap; 14, overflow weir one; 15, overflow weir two; 16, flow guide plate; 17, inclined surface; 18, driving motor; 19, wheel disc one; 20, wheel disc two; 21, belt; 22, connecting shell; 23, rotating arm; 24, dissolved air releasing hole; 25, cavity; 26, sealing member one; 27, sealing member two. DETAILED DESCRIPTION

[0061] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0062] Embodiment 1, with reference to Figures 1-12 , the first embodiment of the present application provides a sewage treatment system, which comprises a tank 1, the bottom of the tank 1 is provided with a partition 2, which divides the tank 1 into upper and lower parts, an annular plate 3 is arranged above the partition 2, which divides the upper part of the tank 1 into an inner cavity and a clamping cavity, a dissolved air pipe 4 is arranged at the bottom of the tank 1, the dissolved air pipe 4 communicates with the inner cavity of the tank 1, and the other end is connected with a dissolved air tank, a blowdown pipe 5 is arranged at the lower part of the tank 1, the blowdown pipe 5 communicates with the clamping cavity of the tank 1, a water inlet pipe 6 is arranged at the middle part of the tank 1, the water inlet pipe 6 communicates with the inner cavity of the tank 1, a water outlet pipe 7 is arranged at the bottom of the tank 1, the water outlet pipe 7 communicates with the inner cavity of the tank 1; further comprising a slag scraping assembly, the slag scraping assembly comprises a rotating shaft 8 arranged on the axis of the tank 1, a connecting plate 9 arranged at the top of the rotating shaft 8, a plurality of support rods 10 arranged in a circular array on the connecting plate 9, and a slag scraping strip 11 arranged on the support rod 10, a plurality of slag collecting shells 12 are arranged at the top of the inner cavity of the tank 1, the number of the support rods 10 is the same as that of the slag collecting shells 12, the slag collecting shell 12 has an open side wall, and the slag collecting shell 12 is provided with a gap 13 for the slag scraping strip 11 to rotate through, when the slag scraping strip 11 penetrates along the open side wall of the slag collecting shell 12, the space formed by the slag scraping strip 11 and the slag collecting shell 12 becomes smaller and smaller, and the slag scraping strip 11 penetrates out of the gap 13; further comprising a driving assembly for driving the rotating shaft 8 to rotate.

[0063] In this embodiment, the top view of the slag collecting shell 12 is approximately triangular, with one side wall attached to the annular plate 3. The slag collecting shell 12 has an open side wall, and the other two side walls form an acute angle. When the slag scraping strip 11 penetrates along the open side wall of the slag collecting shell 12, the space formed by the slag scraping strip 11 and the slag collecting shell 12 becomes smaller. The trapped scum eventually overflows into the clamping cavity through the annular plate 3 and is finally discharged through the discharge pipe. The gap 13 on the slag collecting shell 12 is just suitable for the slag scraping strip 11 to pass through, preventing the scum from passing through. It can be understood that the distribution interval of the gap 13 and the slag scraping strip 11 is not fixed, but is selected according to the impurities in the water body and the purification requirements, so that the gap 13 has an obstacle effect on the scum. In this way, when the slag scraping strip 11 rotates, both water and the slag scraping strip 11 can pass through the gap 13, while the scum cannot pass through, thereby concentrating and skimming the scum.

[0064] By setting the slag scraping assembly, the volume of the space enclosed by the slag scraping strip 11 and the slag collecting shell 12 is continuously reduced during the rotation of the slag scraping strip 11, and then the scum is skimmed into the clamping cavity. By setting the area of the enclosure that is continuously reduced, the scum is scraped off, which has the following advantages:

[0065] 1. Improve the efficiency of scum collection

[0066] The design of the gradually reduced enclosure area can concentrate the scum and guide it to a smaller area, reducing the dispersion range of the scum. This design speeds up the collection of the scum and reduces the residence time of the scum on the surface of the flotation tank, thereby avoiding the re-settlement or backflow of the scum into the water body.

[0067] 2. Enhance the concentration effect of the scum

[0068] The reduced area of the enclosure will have a certain extrusion effect on the scum, which will be concentrated during the scraping process. The lower water content of the scum is more conducive to subsequent sludge dewatering and drying treatment, improving the economy and efficiency of the entire sludge treatment.

[0069] 3. Reduce the impact of scum on the flotation tank

[0070] If the scum floats on the surface of the flotation tank for a long time, it may cause secondary pollution, affect the treatment effect of the flotation tank, and may cause equipment blockage or damage. Timely removal of the scum can protect the treatment efficiency of the flotation tank, prolong the service life of the equipment, and reduce the failure rate.

[0071] 4. Optimize the flotation process and improve the stability of the system

[0072] The timely removal of the scum helps to keep the water flow in the air floatation tank uniform, and avoid the scum accumulation to disturb the flow state in the tank. Through the guidance and the narrowing area of the enclosure, the operation efficiency and the process stability of the whole system are improved, and the effect of the sewage treatment is ensured.

[0073] With reference to Figures 4-5 , the slag collecting shell 12 is provided with the overflow weir one 14 near the annular plate 3 and at the position of the side wall angle, and the annular plate 3 is provided with the overflow weir two 15 corresponding to the position of the overflow weir one 14.

[0074] In the embodiment, the depth of the overflow weir one 14 and the overflow weir two 15 can be the same or different. Generally, the depth of the overflow weir one 14 is greater than that of the overflow weir two 15, and the faster the filtering speed is, the deeper the overflow weir should be selected.

[0075] Through the setting of the overflow weir one 14 and the overflow weir two 15, the scum surrounded by the slag scraping strip 11 and the slag collecting shell 12 is discharged.

[0076] With reference to Figures 5-6 , the bottom surface of the slag collecting shell 12 is continuously lifted from the opening of the side wall to the direction of the overflow weir one 14.

[0077] In the embodiment, the bottom surface of the slag collecting shell 12 is an arc surface triangle, so that the surrounding area formed by the slag scraping strip 11 and the slag collecting shell 12 is reduced on two side surfaces and one bottom surface during the rotation of the slag scraping strip 11, and thus the surrounding volume formed by the slag scraping strip 11 and the slag collecting shell 12 is rapidly reduced.

[0078] Through the above setting, the surrounding volume of the scum by the slag scraping strip 11 and the slag collecting shell 12 is further reduced during the rotation of the slag scraping strip 11, and the slag collecting effect of the slag scraping assembly is enhanced.

[0079] With reference to Figure 8 , the slag scraping strip 11 is curved to the rotation direction of the supporting rod 10.

[0080] In the embodiment, the bending arc of the slag scraping strip 11 is conducive to the concentration of the scum blocked in the rotation process into the slag collecting shell 12, and avoids the backflow of the scum to the water body or the settlement.

[0081] Through the above setting, the slag scraping strip 11 can capture the scum at a certain depth below the water surface during the rotation of the slag scraping strip 11, and the slag collecting effect of the slag scraping assembly is enhanced.

[0082] With reference to Figure 5 , the annular flow guide plate 16 is arranged in the clamping cavity, the top surface of the annular flow guide plate 16 is a slope 17, the bottom surface is attached to the partition plate 2, and the lowest point of the slope 17 is connected to the blow-off pipe 5.

[0083] Through the setting of the annular flow guide plate 16 with the top surface being the slope 17, the scum is discharged to the blow-off pipe 5 more quickly.

[0084] Referring to Figure 3 and Figure 9 , the drive assembly includes a drive motor 18 arranged below the partition plate 2, a gearbox connected to the drive motor 18, a pulley I 19 arranged on the output shaft of the gearbox, and a pulley II 20 arranged on the rotating shaft 8, the pulley I 19 and the pulley II 20 being drivingly connected through a belt 21. Through the drive assembly, the rotating shaft 8 is driven to rotate.

[0085] Referring to Figure 3 and Figures 10-12 , the air release assembly further includes a connecting shell 22 arranged on the shaft wall of the rotating shaft 8, a plurality of rotating arms 23 arranged on the connecting shell 22, and a plurality of air release holes 24 arranged on the rotating arms 23. The lower end of the rotating shaft 8 is a hollow cavity 25, the hollow cavity 25 is in communication with the connecting shell 22, the connecting shell 22 is in communication with the rotating arms 23, and the air release pipe 4 is rotatably connected to the bottom end of the rotating shaft 8.

[0086] In this embodiment, the rotating arms 23 are arranged in four groups, the connecting shell 22 and the rotating arms 23 each have a hollow cavity 25, the connecting shell 22 is fixedly connected with the rotating arms 23 and the rotating shaft 8, the rotating shaft 8 is provided with a hole communicating the hollow cavity 25 with the connecting shell 22, and the connecting shell 22 is also provided with a hole communicating the rotating arms 23. When the rotating shaft 8 rotates, it drives the rotating arms 23 to rotate, so that the micro-bubbles released by the air release holes 24 are distributed in a spiral shape in the annular plate 3, increasing the uniformity of the distribution of micro-bubbles in the liquid. At the same time, the rotating arms 23 have a turbulence effect, causing the liquid to be stirred and uniformly contacted with the micro-bubbles.

[0087] By arranging the air release assembly, the rotating arms 23 in the air release system of the air flotation sewage treatment machine, through the design of dynamic release of air during the rotation of the rotating arms 23, significantly improve the treatment efficiency and system reliability. The advantages of this design include:

[0088] 1. Improve the adhesion efficiency of bubbles and impurities: The dynamic release method of the rotating arms 23 can make the bubbles more uniformly dispersed in the water, and through its continuous rotating motion, increase the collision probability between the bubbles and the suspended matter. This design effectively improves the adhesion efficiency of bubbles and impurities in the water, so that more suspended matter can be attached by micro-bubbles and floated, thereby improving the effect of sewage treatment.

[0089] 2. Enhance the stability of bubbles and maintain the small size: The movement of the rotating arms 23 avoids the aggregation or merging phenomenon that may occur during the release of bubbles, and can maintain the small size of the bubbles. The total surface area of the micro-bubbles is larger, and the contact efficiency with the suspended matter is higher, which is crucial for improving the efficiency of air flotation. Maintaining the stability of the bubbles is one of the keys to achieving high-efficiency air flotation.

[0090] 3. Uniformly improve water flow distribution: The dynamic release of the rotating arm 23 can form a uniform water flow distribution within the dissolved gas release area. This can prevent local areas from being over-treated or under-treated, ensuring that bubbles and suspended matter are evenly distributed throughout the treatment area, thereby improving overall treatment effectiveness and making the treatment process more efficient.

[0091] 4. Reduce clogging and maintenance costs: The rotating arm 23 can constantly change the direction and speed of the water flow during movement, and this dynamic water flow helps prevent solid particles from accumulating inside the diffuser, thereby reducing clogging problems. The stable operation of the dissolved gas diffuser not only reduces the frequency of maintenance, but also reduces the time and cost of shutdown maintenance.

[0092] 5. Adapt to various treatment needs: The speed and direction of the rotating arm 23 can be flexibly adjusted, which enables the air flotation wastewater treatment machine to optimize system parameters according to different water quality and treatment goals. For example, when the concentration of suspended matter in the water is high, the treatment efficiency can be improved by adjusting the movement parameters of the rotating arm 23. This flexibility enhances the adaptability of the air flotation system to different working conditions.

[0093] 6. Optimize energy consumption: Through precise control of the rotating arm 23, the release and distribution of bubbles are more reasonable, thereby avoiding energy waste. Optimized air flotation process can reduce the overall energy consumption of the equipment, which not only reduces operating costs, but also meets environmental protection requirements, promoting the sustainable development of water treatment technology.

[0094] Reference Figure 3 , the sealing piece one 26 is arranged at the connection position of the dissolved gas pipe 4 and the rotating shaft 8, and the sealing piece two 27 is arranged at the connection position of the rotating shaft 8 and the partition plate 2.

[0095] In this embodiment, the sealing piece one 26 and the sealing piece two 27 are rotating seals, which are key components for sealing the rotating shaft 8 in rotating equipment, commonly used in rotating pumps, compressors, mixers, centrifuges and other equipment. It can effectively prevent liquid from leaking from the inside of the equipment to the outside environment and maintain the normal operation of the equipment. Through the above setting, the sealing performance of the rotating shaft 8 during rotation is guaranteed.

[0096] Working principle of the present application:

[0097] The driving motor 18 drives the rotating shaft 8 to rotate, and the rotating shaft 8 drives the connecting plate 9, the supporting rod 10, and the slag scraping strip 11 to rotate. When the slag scraping strip 11 passes through the slag collecting shell 12, the volume enclosed by the slag scraping strip 11 and the slag collecting shell 12 is continuously reduced, and finally the concentrated floating slag is discharged into the clamping cavity through the overflow weir one 14 and the overflow weir two 15, and finally discharged through the discharge pipe. At the same time, the rotating shaft 8 drives the rotating arm 23 to rotate when rotating, so that the micro-bubbles released by the dissolved air release hole 24 are distributed in a spiral shape in the annular plate 3, increasing the uniformity of the distribution of micro-bubbles in the liquid. At the same time, the rotating arm 23 has a flow disturbance effect, so that the liquid is stirred and uniformly contacted with the micro-bubbles, thereby improving the slag filtering efficiency.

[0098] Example 2 provides a sewage treatment method using a sewage treatment system, comprising the following steps:

[0099] Step one, start the equipment:

[0100] 1. Turn on the power supply, before starting the air flotation machine, first confirm that the required power supply of the equipment has been correctly connected, and check whether the power voltage and frequency meet the requirements of the equipment, to ensure the stability of the power supply.

[0101] 2. Start the equipment, press the start switch, and observe the running condition during the starting process of the equipment. Pay attention to the following points: whether the air flotation machine starts normally and enters a stable working state; whether the driving motor 18 operates normally and the rotating shaft 8 is driven; whether there are abnormal noises, vibrations or other abnormal phenomena in the equipment.

[0102] 3. Abnormal processing, if it is found that the equipment does not run normally after starting, for example, the motor does not rotate, the air flotation machine is unstable, or abnormal noise occurs, the equipment should be turned off immediately, stopped running and troubleshooting. Common problems may include motor failure, bearing wear, power supply abnormalities, etc., which need to be repaired or replaced in time.

[0103] Step two, adjust the parameters:

[0104] 1. Gas flow adjustment, according to the water quality to be treated, adjust the gas flow valve to control the amount of gas injection, to ensure that the injected gas can be fully mixed and not waste excess gas. If the gas amount is too much, it may cause excessive bubble production, affecting the water quality separation effect; if the gas amount is too small, it may not produce enough bubbles for effective treatment.

[0105] 2. Adjust the water inflow, adjust the water inflow valve to control the water inflow, to ensure that the water level in the equipment is moderate. Pay attention to the change of water level: keep the water level within the specified range to avoid water overflow outside the overflow weir; if the water level is too low, it may cause the treatment effect to decrease or the equipment to be unable to operate normally; if the water level is too high, it may cause the equipment to overload or leak.

[0106] 3. Optimize the adjustment, parameter adjustment needs to be combined with the actual situation, through several times of debugging to find the best gas and water ratio, to ensure that the equipment can achieve the ideal treatment effect.

[0107] Step three, observe the running state:

[0108] 1. Internal observation, regularly observe the internal running state of the tank 1, especially the change of water quality and the generation of bubbles. Check the following aspects: whether the bubble distribution is uniform and the size is moderate; whether the suspended solids in the water can be effectively captured by the bubbles and brought to the surface; whether the discharged clean water is clear and the treatment effect meets the expectation. If the treatment effect is found to be poor, such as turbid water, abnormal bubble distribution, etc., the following needs to be done: adjust the gas flow, water inflow and other parameters; check whether the equipment has problems such as blockage, wear and tear; evaluate whether the equipment running state meets the design requirements.

[0109] 2. Quick response, if serious abnormalities or significant decline in treatment effect are found during observation, stop immediately for inspection to avoid long-term operation causing equipment damage or substandard water treatment.

[0110] Step four, regular cleaning and maintenance:

[0111] 1. Clean the suspended solids, during the operation of the equipment, a certain amount of suspended solids will accumulate inside the tank 1. If not cleaned in time, it may cause the following problems: suspended solids accumulate and block the internal pipes or discharge port of the equipment; affect the normal distribution and flow of bubbles, leading to a decline in the treatment efficiency of the equipment, and even possible damage to the equipment parts. It is recommended to clean the internal suspended solids every day or after each use, especially in critical parts such as the separation tank and the overflow weir, according to the running situation of the equipment.

[0112] 2. Equipment maintenance, regularly check the key components of the equipment, such as the driving motor 18, rotating shaft 8, gas flow valve, etc. to see if they are in good condition. Pay attention to the following: whether the driving motor 18 needs to be lubricated or replaced; whether the rotating shaft 8 has wear or looseness; whether there is leakage or blockage in the valves and pipes.

[0113] 3. Regular maintenance, carry out comprehensive regular maintenance of the air floatation machine. For example: clean the surface and interior of the equipment to prevent dirt accumulation; check whether the electrical wiring is aging or loose; record the equipment running data, analyze the performance change trend, and handle problems in time.

[0114] 4. Abnormal treatment, if some parts of the equipment have been damaged or the function has declined, they should be replaced or repaired in time to avoid small problems leading to overall equipment failure.

[0115] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A sewage treatment system comprising a tank (1) characterised in that: The bottom of the tank body (1) is provided with a partition plate (2) separating the tank body (1) into upper and lower parts, the partition plate (2) is provided with an annular plate (3) above separating the upper part of the tank body (1) into an inner cavity and a clamping cavity, the bottom of the tank body (1) is provided with a dissolved air pipe (4) communicating with the inner cavity of the tank body (1), the lower part of the tank body (1) is provided with a blowdown pipe (5) communicating with the clamping cavity of the tank body (1), the middle part of the tank body (1) is provided with a water inlet pipe (6) communicating with the inner cavity of the tank body (1), the bottom of the tank body (1) is provided with a drain pipe (7) communicating with the inner cavity of the tank body (1). Further comprising a slag scraping assembly, the slag scraping assembly comprises a rotating shaft (8) rotatingly arranged on the axis of the tank body (1), a connecting plate (9) arranged on the top of the rotating shaft (8), a plurality of support rods (10) arranged in a circular array on the connecting plate (9), and a plurality of slag scraping strips (11) arranged on the support rods (10), the inner cavity of the tank body (1) is provided with a plurality of slag collecting shells (12) on the top, the number of the support rods (10) is the same as that of the slag collecting shells (12), the slag collecting shell (12) has an open side wall, the slag collecting shell (12) is provided with a gap (13) through which the slag scraping strip (11) rotates, when the slag scraping strip (11) penetrates along the open side wall of the slag collecting shell (12), the space formed by the slag scraping strip (11) and the slag collecting shell (12) becomes smaller and smaller, and the slag scraping strip (11) penetrates out of the gap (13); Further comprising a driving assembly for driving the rotating shaft (8) to rotate; The slag collecting shell (12) is provided with an overflow weir one (14) near the annular plate (3) and at the position of the side wall angle, and the annular plate (3) is provided with an overflow weir two (15) corresponding to the position of the overflow weir one (14); The bottom surface of the slag collecting shell (12) is continuously raised from the opening of the side wall to the direction of the overflow weir one (14).

2. The sewage treatment system of claim 1, wherein: The slag scraping strip (11) is curved to the rotating direction of the support rod (10).

3. The sewage treatment system of claim 1, wherein: The clamping cavity is provided with an annular flow guide plate (16), the top surface of the annular flow guide plate (16) is a slope (17), the bottom surface is attached to the partition plate (2), and the lowest point of the slope (17) is connected to the blowdown pipe (5).

4. The sewage treatment system of claim 1, wherein: The driving assembly comprises a driving motor (18) arranged below the partition plate (2), a gearbox connected to the driving motor (18), a wheel disc one (19) arranged on the output shaft of the gearbox, and a wheel disc two (20) arranged on the rotating shaft (8), and the wheel disc one (19) and the wheel disc two (20) are drivingly connected through a belt (21).

5. The sewage treatment system of claim 1, wherein: Further comprising a dissolved air releasing assembly, the dissolved air releasing assembly comprises a connecting shell (22) arranged on the shaft wall of the rotating shaft (8), a plurality of rotating arms (23) arranged on the connecting shell (22), and a plurality of dissolved air releasing holes (24) arranged on the rotating arms (23), the lower end of the rotating shaft (8) is a hollow cavity (25), the hollow cavity (25) is communicated with the connecting shell (22), the connecting shell (22) is communicated with the rotating arms (23), and the dissolved air pipe (4) is rotatably connected to the bottom end of the rotating shaft (8).

6. The sewage treatment system of claim 5, wherein: The sealing piece one (26) is arranged at the connection of the gas dissolving pipe (4) and the rotating shaft (8), and the sealing piece two (27) is arranged at the connection of the rotating shaft (8) and the partition plate (2).

7. A sewage treatment method using the sewage treatment system according to claim 4, characterized by, The method comprises the following steps: Step one: start the equipment, turn on the power supply, press the switch to start the equipment after ensuring the stable power supply, check whether the equipment is running normally, whether the air floatation machine is in the stable working state, and whether the driving motor (18) drives the rotating shaft (8) to rotate; Step two: adjust the parameters, adjust the gas flow, adjust the water inflow, and keep the water level from overflowing outside the overflow weir one (14); Step three: observe the running state, observe the water quality change and the bubble generation in the tank body (1), and judge whether the treatment effect reaches the expectation; Step four: according to the running state, clean the suspended matter in the tank body (1) regularly, and prevent the equipment from being blocked.

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