Sewage treatment equipment based on MBBR technology

Abstract

The present invention relates to the field of sewage treatment, and specifically to sewage treatment equipment based on MBBR technology, including a treatment box, which is sequentially arranged from left to right and connected with an anoxic tank, an aerobic tank and a dosing tank, a rotating shaft is rotatably connected in the dosing tank, a sleeve is splined on the upper part of the rotating shaft, a plurality of stirring rods are hinged circumferentially on the lower part of the sleeve, and an elastic member is fixed between the stirring rod and the outer wall of the sleeve; a plurality of groups of first through holes are vertically arranged on the upper part of the sleeve, each group of first through holes is evenly distributed along the circumference of the sleeve, the rotating shaft is hollow and a plurality of second through holes matching the first through holes are arranged on the rotating shaft, a slide plate is vertically slidably connected in the rotating shaft, a connecting rod is fixed between the slide plate and the inner wall of the sleeve, a plurality of liquid outlet holes are circumferentially arranged at the lower part of the rotating shaft, a channel connected with the liquid outlet hole is arranged on the side wall of the rotating shaft, and one end of the channel away from the liquid outlet hole is connected with the second through hole; a liquid inlet hole is arranged at the lower part of the rotating shaft. The solution of the present invention can solve the problem of relatively difficult dosing and phosphorus removal for a large amount of sewage in a relatively uniform manner.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to sewage treatment equipment based on MBBR technology. Background Art

[0002] Domestic sewage is mainly the discharge water generated by various kitchen water, washing water and toilet water used in human life. It is mainly non-toxic inorganic salts, containing a large amount of suspended solids, chemically or biodegradable soluble or colloidally dispersed organic matter, nitrogen-containing compounds, phosphates, potassium and sodium and heavy metal ions, fungal biota, etc. Organic nitrogen and ammonia nitrogen in water will consume dissolved oxygen in water, making the water black and smelly; too much nitrogen and phosphorus in water will cause eutrophication of water and deteriorate the water environment. In response to this, relevant national departments have implemented increasingly strict control over the indicators of nitrogen and phosphorus in sewage.

[0003] The Moving Bed Biofilm Reactor (MBBR) process came into being. The MBBR process originated in Norway in the early 1990s and is currently a mature sewage biochemical treatment technology in the world. Since the construction of the first biological moving bed process unit in 1989, thousands of municipal and industrial wastewater treatment facilities have been built in more than 50 countries, achieving good results. This process uses suspended fillers to provide growth carriers for microorganisms, and achieves efficient sewage treatment through the full fluidization of suspended fillers. This process fully absorbs the advantages of biological contact oxidation and biological fluidized beds, overcomes their disadvantages such as low mass transfer efficiency, poor treatment efficiency, and high fluidization power, uses the basic principles of the biofilm method, and fully utilizes the advantages of the activated sludge method to achieve the activated sludge mode operation of the biofilm process.

[0004] At present, the MBBR process flow is to pass the sewage into the anoxic tank, aerobic tank, dosing tank and sedimentation tank in sequence and then discharge it. The sludge settled in the sedimentation tank needs to be returned to the anoxic tank and aerobic tank to continue to react. The anoxic tank and the aerobic tank are equipped with suspended fillers, and phosphorus is mainly removed by biological phosphorus removal. The phosphorus removal effect is not ideal.

[0005] Therefore, the prior art proposes to add phosphorus removal liquid into the dosing tank, and perform secondary auxiliary phosphorus removal by chemical phosphorus removal to achieve the phosphorus removal requirements. However, the total amount of sewage in the dosing tank is large, and it is difficult to achieve sufficient mixing of sewage and liquid after dosing, and it is difficult to do phosphorus removal uniformly for a large amount of sewage. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a sewage treatment device based on MBBR technology to solve the problem that it is difficult to remove phosphorus by adding chemicals in a relatively uniform manner for a large amount of sewage.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The sewage treatment equipment based on MBBR technology includes a treatment box, which is arranged from left to right and connected with an anoxic tank, an aerobic tank and a dosing tank. The anoxic tank and the aerobic tank are both provided with suspended fillers. The dosing tank is rotatably connected with a rotating shaft, and a sleeve is splined on the upper part of the rotating shaft. A nut is threadedly connected to the outer wall of the sleeve, and the nut is fixed on the top of the treatment box; a plurality of stirring rods are hinged on the upper side of the sleeve, and an elastic member is fixed between the stirring rod and the outer wall of the sleeve; a plurality of first passages are provided on the upper side of the sleeve in the circumferential direction. The rotating shaft is hollow and is provided with a plurality of second through holes matching with the first through holes. A slide is vertically slidably connected in the rotating shaft. A connecting rod is fixed between the slide and the inner wall of the sleeve. A plurality of liquid outlet holes are circumferentially provided at the lower part of the rotating shaft. A channel connected with the liquid outlet hole is provided on the side wall of the rotating shaft. One end of the channel away from the liquid outlet hole is connected with the second through hole. A liquid outlet one-way valve is installed in the first through hole. A liquid inlet hole is provided at the lower part of the rotating shaft. A liquid inlet one-way valve is installed in the liquid inlet hole. The liquid inlet hole is connected with a medicine box for storing liquid medicine.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. The lead screw pair makes the sleeve to move vertically and spirally while rotating. The stirring rod moves vertically while the sleeve rotates. The stirring rod is hinged on the sleeve. When the stirring rod moves up and down, it is deflected by the water pressure, so that the stirring range of the stirring rod is constantly changed, the stirring range is expanded, and the mixture of the liquid medicine and sewage is more uniform and the reaction is more complete.

[0011] 2. When the sleeve moves upward, the slide plate is driven upward by the connecting rod, the space below the rotating shaft increases, and the medicine liquid in the medicine box is drawn into the rotating shaft. When the sleeve moves downward, the slide plate is driven downward, the space below the rotating shaft decreases, and the pressure increases. When the first through hole and the second through hole have overlapping parts, the medicine liquid in the channel is sprayed outward under the action of pressure. According to Bernoulli's principle, as the overlapping area of ​​the first through hole and the second through hole becomes larger and larger, the flow rate of the medicine liquid spraying gradually decreases. Then, in the process of the first through hole and the second through hole gradually overlapping and gradually separating, the flow rate of the medicine liquid spraying changes from large to small and then to large. The change in the flow rate of the medicine liquid causes the distance of the medicine liquid spraying to change, that is, the medicine liquid can be sprayed to different positions in the dosing tank, so that the medicine liquid spraying range is wider, so that it can be better mixed with the sewage.

[0012] 3. As the shaft and sleeve are in the process of rotation, the liquid medicine is also sprayed out while rotating. The sprayed liquid medicine can form a small vortex in the sewage. As the stirring rod moves, the sprayed liquid medicine is stirred and dispersed by the stirring rod. The two cooperate with each other, thereby making the mixing reaction of the liquid medicine and sewage more complete.

[0013] Furthermore, multiple groups of first through holes are vertically arranged along the sleeve, and multiple groups of second through holes are vertically arranged along the rotating shaft.

[0014] Beneficial effect: By vertically arranging multiple groups of first through holes and second through holes, the sprayable range of the liquid medicine is increased.

[0015] Furthermore, the elastic member is a bellows, and a third through hole is provided on the bellows.

[0016] Beneficial effect: During the deflection of the stirring rod, the bellows is driven to stretch or compress, thereby changing the size of the space inside the bellows. The space inside the bellows becomes larger, and the sewage around the bellows can enter the bellows through the third through hole. The space inside the bellows becomes smaller, and the sewage in the bellows is discharged through the third through hole. The sewage changes its position in the dosing tank during the process of entering and exiting the bellows, and cooperates with the stirring of the stirring rod to further achieve mixing of the sewage and the drug solution.

[0017] Furthermore, a closable water outlet is provided in the middle of the sedimentation tank, a closable mud outlet is provided at the bottom of the sedimentation tank, baffles are laterally slidably connected to the water outlet and the mud outlet on the outer wall of the sedimentation tank, and a connecting rod is fixed between the two baffles.

[0018] Beneficial effect: the two baffles can be slid simultaneously through the connecting rod, the two baffles can block the water outlet and the mud outlet at the same time, and can also open the water outlet and the mud outlet at the same time, so that after the sludge in the sedimentation tank is fully settled, the water outlet and the mud outlet can be opened at the same time to drain the water and mud.

[0019] Furthermore, a fixing rod is fixed on the sleeve below the stirring rod along the circumferential direction, the vertical projection of the fixing rod is located between adjacent stirring rods, and the lateral projection of the fixing rod is located between adjacent groups of first through holes.

[0020] Beneficial effect: By adding a fixed rod, the stirring range is increased, the stirring dead angle is reduced, and the mixing reaction of the liquid medicine and sewage is further made more complete.

[0021] Furthermore, the fixing rod is a telescopic rod, and the free end of the fixing rod is in contact with the inner wall of the dosing tank.

[0022] Beneficial effect: The free end of the fixed rod can scrape the sludge adhering to the inner wall of the dosing tank, so that the sludge adhering to the inner wall of the dosing tank can be separated from the inner wall of the dosing tank and fall to the bottom of the dosing tank, which is convenient for the final discharge of the sludge. If the fixed rod is set as a telescopic rod, it can meet the different shapes of the inner wall of the dosing tank, so that the inner wall of the dosing tank is not limited to a cylindrical shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a top view of an embodiment of the present invention.

[0024] Figure 2It is a front cross-sectional view of the dosing tank in an embodiment of the present invention.

[0025] Figure 3 It is a side view of the sedimentation tank in an embodiment of the present invention.

[0026] In the figure: treatment box 1, dosing tank 2, partition 3, rotating shaft 4, sleeve 5, nut 6, stirring rod 7, bellows 8, slide plate 9, connecting rod 10, strip groove 11, first through hole 12, second through hole 13, channel 14, liquid outlet 15, rod body 16, telescopic part 17, fixing rod 18, spring 19, wedge 20, anoxic tank 21, aerobic tank 22, aerator 23, baffle 24, water inlet 25, connecting rod 26, sedimentation tank 27. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings, and specific implementation methods are given.

[0028] like Figure 1 As shown, the sewage treatment equipment based on MBBR technology includes a treatment box 1, three partitions 3 are fixed in the treatment box 1, the partitions 3 divide the treatment box 1 into an anoxic tank 21, an aerobic tank 22, a dosing tank 2 and a sedimentation tank 27 from left to right, and a plurality of sieve holes are provided on the partition 3. Suspended fillers are provided in the anoxic tank 21 and the aerobic tank 22. The setting of the suspended filler is a common means of the existing MBBR technology. For details, please refer to the patent application number 201820377477.5 "An integrated MBBR integrated sewage treatment equipment", which will not be described in detail in this application.

[0029] A water inlet 25 is provided on the left side of the anoxic tank 21. A mixer is installed in the anoxic tank 21. Sewage enters the anoxic tank 21 through the water inlet 25. The sewage initially reacts with the suspended filler through the mixer in the anaerobic environment of the anoxic tank 21. An aerator 23 is installed at the bottom of the aerobic tank 22. The specific aerator 23 is a jet aerator 23. The sewage enters the aerobic tank 22 through the partition 3 between the anoxic tank 21 and the aerobic tank 22. Under the aeration action of the aerator 23, the sewage reacts with the suspended filler in the aerobic tank 22. The reaction processes of the sewage in the anoxic tank 21 and the aerobic tank 22 are all common means of the existing MBBR technology, which will not be described in detail in this embodiment. The sewage enters the dosing tank 2 through the partition 3 between the aerobic tank 22 and the dosing tank 2. A dosing mechanism is installed in the dosing tank 2. After the sewage is mixed with the liquid medicine in the dosing tank 2, it enters the sedimentation tank 27 through the partition 3 between the dosing tank 2 and the sedimentation tank 27. Figure 3As shown, a closable water outlet is provided in the middle of the sedimentation tank 27, and a closable mud outlet is provided at the bottom of the sedimentation tank. Specifically, baffles 24 are laterally slidably connected at the water outlet and the mud outlet on the outer wall of the sedimentation tank 27, and a connecting rod 26 is fixed between the two baffles 24. The two baffles 24 can be slid at the same time by the connecting rod 26. The two baffles 24 can block the water outlet and the mud outlet at the same time, and can also open the water outlet and the mud outlet at the same time.

[0030] Combination Figure 2 As shown, the dosing mechanism includes a rotating shaft 4 rotatably connected in the dosing tank 2, the upper end of the rotating shaft 4 passes through the top of the processing box 1 and extends to the outside of the processing box 1, the upper part of the rotating shaft 4 is splined with a sleeve 5, the upper end of the sleeve 5 also passes through the processing box 1 and extends to the outside of the processing box 1, the upper part of the sleeve 5 is provided with a threaded section, the threaded section is threadedly connected with a nut 6, the nut 6 is fixed to the top of the processing box 1, and a motor for driving the rotating shaft 4 to rotate is fixed to the top of the processing box 1, and the output shaft of the motor is fixed to the top of the rotating shaft 4.

[0031] A plurality of first through holes 12 are vertically arranged on the sleeve 5, and each group of first through holes 12 is evenly distributed along the circumference of the sleeve 5. A liquid discharge check valve is installed in the first through hole 12. The rotating shaft 4 is hollow and a plurality of second through holes 13 cooperating with the first through holes 12 are arranged on the rotating shaft 4. A plurality of liquid discharge holes 15 are circumferentially arranged at the lower part of the rotating shaft 4. A channel 14 communicating with the liquid discharge holes 15 is arranged on the side wall of the rotating shaft 4. The end of the channel 14 away from the liquid discharge hole 15 is communicated with the second through hole 13. When the first through hole 12 and the second through hole 13 coincide, the liquid inside the rotating shaft 4 can be discharged through the liquid discharge hole 15, the channel 14, the second through hole 13, and the first through hole 12 in sequence. A slide plate 9 is vertically slidably connected inside the rotating shaft 4, and an L-shaped connecting rod 10 is fixed on the upper end of the slide plate 9. A vertical strip groove 11 is arranged on the upper part of the rotating shaft 4, and the upper end of the connecting rod 10 is inserted into the strip groove 11 and fixed to the inner wall of the sleeve 5. A liquid inlet hole is provided at the lower part of the rotating shaft 4, and a liquid inlet check valve is installed in the liquid inlet hole. When the pressure inside the rotating shaft 4 decreases, external liquid can enter the rotating shaft 4 through the liquid inlet check valve. The liquid inlet hole is connected to a medicine box for storing liquid medicine through a pipeline. The medicine box is fixed on the outer wall of the treatment box 1, and the operator can regularly replenish the liquid medicine into the medicine box.

[0032] A plurality of stirring rods 7 are hingedly connected to the lower part of the sleeve 5 along the circumferential direction, and an elastic member is fixed between the stirring rod 7 and the outer wall of the sleeve 5, and the elastic member is a bellows 8, and a third through hole is provided on the bellows 8. The vertical projections of the stirring rods 7 are all located between each group of adjacent first through holes 12. A fixed rod 18 is fixed to the sleeve 5 along the circumferential direction below the stirring rod 7, and the vertical projection of the fixed rod 18 is located between adjacent stirring rods 7, and the horizontal projection of the fixed rod 18 is located between adjacent groups of first through holes 12. The fixed rod 18 is a telescopic rod, and specifically, the fixed rod 18 includes a rod body 16 and a telescopic portion 17 sleeved on the rod body 16, a spring 19 is fixed between the telescopic portion 17 and the rod body 16, and a wedge 20 is fixed to the free end of the telescopic portion 17, and the end of the wedge 20 is in contact with the inner wall of the dosing tank 2.

[0033] The working process of sewage in the dosing tank 2 is as follows:

[0034] When the motor rotates forward, it drives the shaft 4 to rotate forward. The shaft 4 drives the sleeve 5 to rotate through the spline connection. At the same time, the sleeve 5 and the nut 6 form a screw pair, which makes the sleeve 5 move upward. When the sleeve 5 moves upward, the slide plate 9 is driven upward through the connecting rod 10. The space below the shaft 4 increases, and the medicine liquid in the medicine box is drawn into the shaft 4.

[0035] When the motor reverses, the shaft 4 is driven to rotate in the opposite direction, and the sleeve 5 moves downward through the screw pair. When the sleeve 5 moves downward, the slide plate 9 is driven to move downward, the space below the shaft 4 is reduced, and the pressure is increased. At this time, the first through hole 12 gradually approaches the second through hole 13 as the sleeve 5 moves downward, gradually overlaps, and then gradually separates. When the first through hole 12 and the second through hole 13 have overlapping parts, the liquid medicine in the channel 14 is sprayed outward under the pressure. According to the Bernoulli principle, as the overlapping area of ​​the first through hole 12 and the second through hole 13 becomes larger and larger, the flow rate of the liquid medicine spraying gradually decreases. Then, in the process of the first through hole 12 and the second through hole 13 gradually overlapping and gradually separating, the flow rate of the liquid medicine spraying changes from large to small and then to large. The change of the liquid medicine flow rate causes the liquid medicine spraying distance to change, that is, the liquid medicine can be sprayed to different positions in the dosing tank 2, and multiple vertical groups of first through holes 12 and second through holes 13 are set at the same time, so that the liquid medicine spraying range is wider, so as to better mix with the sewage.

[0036] At the same time, the stirring rod 7 and the fixed rod 18 both make vertical spiral motions simultaneously with the rotation of the sleeve 5. The stirring rod 7 is hinged on the sleeve 5. The stirring rod 7 is subjected to water pressure when moving up and down. The stirring rod 7 deflects upward when moving downward, and deflects downward when moving upward, so as to realize the continuous change of the stirring range of the stirring rod 7. The stirring rod 7 drives the bellows 8 to stretch or compress during the deflection process. The setting of the bellows 8 also avoids the stirring rod 7 from deflecting too much upward or downward and deflecting too fast under the action of water pressure, thereby losing the stirring effect. When the bellows 8 is stretched, the space inside the bellows 8 becomes larger, and the sewage around the bellows 8 can enter the bellows 8 through the third through hole. When the bellows 8 is compressed, the space inside the bellows 8 becomes smaller, and the sewage in the bellows 8 is discharged through the third through hole. The sewage changes its position in the dosing tank 2 through the process of entering and exiting the bellows 8. With the stirring of the stirring rod 7, the mixing of sewage and liquid medicine can be better achieved.

[0037] During the rotation of the fixed rod 18 with the sleeve 5, the telescopic portion 17 drives the wedge block 20 to always be in contact with the inner wall of the dosing tank 2 through the force of the spring 19. The wedge block 20 scrapes the sludge adhered to the inner wall of the dosing tank 2, so that the sludge adhered to the inner wall of the dosing tank 2 can be separated from the inner wall of the dosing tank 2, which is convenient for discharging the sludge and prevents the sludge from clogging the partition 3.

[0038] After the sewage reacts in the dosing tank 2, it enters the sedimentation tank 27. After sedimentation in the sedimentation tank 27, the two baffles 24 are slid simultaneously through the connecting rod 26, so that the water outlet and the mud outlet are both opened, and the water in the upper part of the sedimentation tank 27 is discharged through the water outlet, and the sludge in the lower part of the sedimentation tank 27 is discharged through the mud outlet.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. The wastewater treatment equipment based on MBBR technology includes a treatment box, which is arranged from left to right and connected with an anoxic tank, an aerobic tank, a dosing tank and a sedimentation tank. The anoxic tank and the aerobic tank are both provided with suspended fillers, and the characteristics are: The dosing tank is rotatably connected with a rotating shaft, and the upper part of the rotating shaft is splined with a sleeve, and the outer wall of the sleeve is threadedly connected with a nut, and the nut is fixed on the top of the processing box; a plurality of stirring rods are hinged on the sleeve along the circumference, and a bellows is fixed between the stirring rod and the outer wall of the sleeve, and a third through hole is provided on the bellows; a plurality of first through holes are circumferentially provided on the sleeve, the rotating shaft is hollow and a plurality of second through holes matching the first through holes are provided on the rotating shaft, and the first through holes are vertically arranged in multiple groups along the sleeve, and the second through holes are also vertically arranged in multiple groups along the rotating shaft; a slide plate is vertically slidably connected in the rotating shaft, and a connecting rod is fixed between the slide plate and the inner wall of the sleeve, a plurality of liquid outlet holes are circumferentially provided at the lower part of the rotating shaft, and a channel connected to the liquid outlet hole is provided on the side wall of the rotating shaft, and an end of the channel away from the liquid outlet hole is connected to the second through hole, and a liquid outlet one-way valve is installed in the first through hole; the lower part of the rotating shaft A liquid inlet hole is provided, in which a liquid inlet one-way valve is installed, and the liquid inlet hole is connected to a medicine box for storing liquid medicine; a fixed rod is fixed on the sleeve below the stirring rod along the circumferential direction, the vertical projection of the fixed rod is located between adjacent stirring rods, and the horizontal projection of the fixed rod is located between adjacent groups of first through holes, the fixed rod is a telescopic rod, and the free end of the fixed rod is in contact with the inner wall of the dosing tank; the rotating shaft can drive the sleeve to rotate, and the sleeve and the nut form a screw pair; the stirring rod and the fixed rod both make vertical spiral motion at the same time as the sleeve rotates, and the stirring rod drives the bellows to stretch or compress during the deflection process; when the bellows is stretched, the space inside the bellows becomes larger, and the sewage around the bellows can enter the bellows through the third through hole; when the bellows is compressed, the space inside the bellows becomes smaller, and the sewage in the bellows is discharged through the third through hole.

2. The MBBR-based sewage treatment equipment according to claim 1, characterized in that: The sedimentation tank is provided with a closable water outlet hole in the middle, a closable mud outlet hole at the bottom, baffles are laterally slidably connected at the water outlet hole and the mud outlet hole on the outer wall of the sedimentation tank, and a connecting rod is fixed between the two baffles.

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