A municipal wastewater treatment device and method based on an improved MSBR process

Abstract

The present invention discloses a municipal wastewater treatment device and method based on an improved MSBR process, which relates to the technical field of environmental engineering sewage treatment. The wastewater treatment device includes a coarse grille, a lift pump house, a fine grille, an aerated grit chamber, an improved MSBR tank, a high-efficiency clarifier, an autotrophic denitrification filter, a rotary disk filter, a contact disinfection tank, and a discharge tank. In the improved MSBR reaction tank of the present invention, the wastewater sequentially undergoes anaerobic and anoxic agitation, aerobic aeration, agitation, aeration, pre-sedimentation, and sedimentation of the effluent in the facultative zone and the sequencing batch zone, and then the total phosphorus is removed by the high-efficiency clarifier, and the autotrophic denitrification unit performs deep denitrification to ensure that the final effluent meets the Class IV surface water standard. The present invention is provided with a first skimming pipe and a second skimming pipe, and the second skimming pipe and the first skimming pipe are controlled by a linkage component to be fixedly connected or slidably connected, so as to facilitate the cleaning mechanism to clean the inner wall of the second skimming pipe and the spiral blade inside the second skimming pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental engineering sewage treatment, and specifically to a municipal wastewater treatment device and method based on an improved MSBR process. Background Art

[0002] Some sewage treatment plants built in the early stage adopted the SBR process and the CAST process based on it. With the increase in water volume and the improvement of discharge standards, it is necessary to upgrade and transform them. The MSBR process is a sewage treatment process developed on the basis of the original A2O process and SBR process, making full use of their advantages, not only ensuring the effluent quality, but also saving land space. This process has gradually been favored, but there are also corresponding defects, such as there are still floating scum on the surface of the sequencing batch, it is easy to generate siphon phenomena, and it is difficult to cultivate bacteria in the sequencing batch area.

[0003] In addition, current wastewater treatment devices usually set skimming devices in areas such as sedimentation tanks. For example, the patent "CN117643749A A peripherally inlet and peripherally outlet secondary sedimentation tank for adaptively removing floating sludge" discloses a method for removing floating scum on the water surface, but the technical solution of this patent cannot effectively clean the inner wall of the skimming pipe and the spiral blades, and can only dredge the liquid outlet end. In the actual working process, after long-term operation, a large amount of floating scum will adhere to the inner wall of the skimming pipe and the spiral blades. When the skimming device is not working, if it is not cleaned in time, not only is there a risk of blockage in the subsequent use process, but also the service life of the skimming pipe and the spiral blades will be affected due to corrosion and other reasons; finally, after the floating scum is discharged, since the floating scum itself contains a lot of water, sewage will drip onto the outside every time the staff collects the floating scum, polluting the environment, and this phenomenon is tantamount to increasing the subsequent cleaning workload of the staff. Summary of the Invention

[0004] The purpose of the present invention is to provide a municipal wastewater treatment device and method based on an improved MSBR process to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A municipal wastewater treatment device based on an improved MSBR process. The wastewater treatment device includes a coarse grille, a lift pump house, a fine grille, an aerated grit chamber, an improved MSBR tank, a high-efficiency clarifier, an autotrophic denitrification filter, a rotary disc filter, a contact disinfection tank, and a discharge tank. The wastewater sequentially passes through the coarse grille, the lift pump house, the fine grille, the aerated grit chamber, the improved MSBR tank, the high-efficiency clarifier, the autotrophic denitrification filter, the rotary disc filter, the contact disinfection tank, and the discharge tank. The improved MSBR tank includes a No. 3 pre-anoxic zone, a No. 2 sludge thickening zone, a No. 4 anaerobic zone, a No. 5 anoxic zone, a No. 6 aerobic zone, an anoxic-aerobic zone, and a sequencing batch zone. The No. 3 pre-anoxic zone, the No. 2 sludge thickening zone, the No. 4 anaerobic zone, the No. 5 anoxic zone, the No. 6 aerobic zone, the anoxic-aerobic zone, and the sequencing batch zone are connected in sequence. A foam collection device, a skimming device, a liquid level gauge, and an air outlet weir are arranged in the sequencing batch zone. The water outlet of the sequencing batch zone is controlled by the air outlet weir. An outlet pipe is arranged at the water outlet end of the sequencing batch zone. A pneumatic valve is arranged on the outlet pipe. The pneumatic valve and the liquid level gauge are interlocked to ensure that no siphon phenomenon occurs during water discharge through the pneumatic valve and the liquid level gauge.

[0006] Further, the skimming device includes a first skimming pipe, a first fixing seat, a second fixing seat, a reversing motor, and a second skimming pipe. The first fixing seat is fixedly installed on the inner wall of the sequencing batch zone. The second fixing seat is arranged outside the sequencing batch zone and is fixedly connected to the outer wall of the sequencing batch zone through a bracket. The first skimming pipe is arranged between the first fixing seat and the second fixing seat. One end of the first skimming pipe close to the first fixing seat is slidably connected to the first fixing seat. An end cover is arranged at one end of the first skimming pipe close to the second fixing seat. The end cover is fixedly connected to the first skimming pipe through bolts. One end of the end cover close to the second fixing seat is slidably connected to the second fixing seat. The reversing motor is arranged at one end of the second fixing seat away from the first skimming pipe. The second skimming pipe is arranged inside the first skimming pipe. The first skimming pipe and the second skimming pipe are connected through a linkage assembly. The working end of the reversing motor is connected to the second skimming pipe. Through the linkage assembly, it is convenient for the staff to control whether the second skimming pipe is fixedly connected or slidably connected to the first skimming pipe according to needs. When the present invention is working to remove floating scum, the second skimming pipe and the first skimming pipe are controlled to be fixed together through the linkage assembly, and the first skimming pipe and the second skimming pipe are controlled to rotate through the reversing motor so as to remove the floating scum on the water surface.

[0007] Furthermore, a first feed hole and a cleaning hole are provided at the middle position of the first scum skimming pipe. A working chamber and a conveying chamber are arranged inside the second scum skimming pipe. A conveying motor is arranged in the working chamber, a conveying shaft is arranged in the conveying chamber, a spiral blade is arranged on the conveying shaft, and a second feed hole is arranged at one end of the conveying chamber close to the first feed hole. When the scum skimming device in the present invention is working to remove scum, the first feed hole is aligned with the second feed hole. The angle between the second feed hole on the second scum skimming pipe and the first feed hole on the first scum skimming pipe and the water surface is controlled by the reversing motor, so as to collect the scum on the water surface into the conveying chamber. The conveying motor drives the conveying shaft and the spiral blade to rotate in the conveying chamber, and then conveys the collected scum to the corresponding treatment area.

[0008] Furthermore, the scum skimming device further includes a cleaning seat. The cleaning seat is arranged on one side of the first scum skimming pipe close to the cleaning hole. A cleaning mechanism is arranged inside the cleaning seat. The linkage assembly includes a first electromagnet and a second electromagnet. The first electromagnet is embedded at one end of the second fixed seat close to the end cover, and the second electromagnet is embedded at one end of the second scum skimming pipe close to the end cover. The end cover is made of ferromagnetic metal. When the scum skimming device is working to remove scum, the second electromagnet generates a magnetic field that attracts the end cover (the first electromagnet is in a non-working state). At this time, the second scum skimming pipe and the first scum skimming pipe are fixed together to form a whole through the second electromagnet and the end cover, so that the reversing motor can control the second scum skimming pipe and the first scum skimming pipe to rotate synchronously. When the scum skimming device is in a non-working state, if the staff needs to clean the inside of the second scum skimming pipe, the second electromagnet can be directly turned off and the first electromagnet can be turned on. The end cover is attracted and fixed by the first electromagnet. Since the second fixed seat is fixedly connected to the outer wall of the sequencing batch zone, when the reversing motor drives the second scum skimming pipe to rotate, the first scum skimming pipe does not rotate. When the second feed hole on the second scum skimming pipe is aligned with the cleaning hole, the staff can turn on the cleaning mechanism to clean the inner wall of the second scum skimming pipe and the spiral blade inside the second scum skimming pipe, avoiding a large amount of scum adhering to the inner wall of the second scum skimming pipe and the spiral blade. Through the above technical solutions, on the one hand, the service life of the second scum skimming pipe and the spiral blade is improved, and on the other hand, the risk of blockage of the second scum skimming pipe is prevented.

[0009] Furthermore, an installation cavity is provided inside the cleaning seat. The installation cavity is aligned with the cleaning hole. A linear motor is provided on the inner wall of the installation cavity. The cleaning mechanism includes a soft brush, a sealing seat, and a mounting plate. The working end of the linear motor is connected to the mounting plate. The sealing seat is arranged at one end of the mounting plate close to the cleaning hole. One end of the sealing seat close to the cleaning hole is of an arc structure. The sealing seat is adapted to the second feed hole. The soft brush is arranged at one end of the sealing seat close to the cleaning hole. When the cleaning mechanism in the present invention works, the linear motor first drives the mounting plate and the sealing seat to move towards the cleaning hole. Finally, the sealing seat and the soft brush will be inserted into the second feed hole. At the same time, the arc surface of the sealing seat will be flush with the inner wall surface of the second skimming pipe. By driving the conveying shaft and the spiral blade to rotate in the conveying cavity through the conveying motor, the conveying shaft and the spiral blade will continuously rub against the soft brush during rotation. The soft brush is used to clean the conveying shaft and the spiral blade. The sealing seat is used to prevent the scum in the second skimming pipe from falling into the cleaning seat during the process of cleaning the second skimming pipe.

[0010] Furthermore, a liquid pump is provided below the cleaning seat. A drain pipe is also provided inside the sealing seat. The drain pipe is connected to the liquid pump through a corrugated expansion pipe. A plurality of groups of water outlets are arranged at one end of the drain pipe close to the second feed hole. When the soft brush in the present invention frictionally cleans the conveying shaft and the spiral blade, the staff can turn on the liquid pump. The liquid pump transports the water in the sequencing batch zone into the drain pipe, and finally the water is sprayed out through the drain pipe. The water sprayed out through the drain pipe, on the one hand, flushes and cleans the inner walls of the conveying shaft, the spiral blade, and the second skimming pipe. On the other hand, the water entering the second skimming pipe will become a medium so that the spiral blade can directly transport and discharge the scum to the outside during rotation. Through the above technical solution of the present invention, the effects of self-cleaning and automatic conveying of cleaning waste liquid can be achieved through the movement of the spiral blade itself without disassembling the skimming device.

[0011] Furthermore, the skimming device further includes an aggregate box. The aggregate box is arranged outside the sequencing batch zone. The outlet end of the second skimming pipe is arranged inside the aggregate box. An aggregate cylinder is provided inside the aggregate box. Filter holes are provided on the aggregate cylinder. The lower end of the aggregate box is communicated with the sequencing batch zone through a reflux pipe. When the skimming device in the present invention removes scum or performs self-cleaning, the transported scum will enter the aggregate box from the outlet end of the second skimming pipe. The aggregate cylinder intercepts the scum, and the water contained in the scum is re-transported into the sequencing batch zone through the reflux pipe.

[0012] Further, a gearbox is also provided inside the aggregate bin. The gearbox is fixedly connected to the top of the aggregate bin through a fixed column. The conveying shaft is connected to the active end of the gearbox. The driven end of the gearbox is connected to the aggregate cylinder through a transmission rod. A speed increasing gear assembly is provided inside the gearbox. When the skimming device in the present invention removes floating slag, in addition to driving the spiral blade to rotate, the conveying shaft also drives the transmission rod and the aggregate cylinder to rotate. After the removal of floating slag is completed, the staff can let the conveying motor continue to operate for a period of time. At this time, the aggregate cylinder will continue to rotate, and the floating slag inside the aggregate cylinder will be quickly dehydrated under the action of centrifugal force, so as to facilitate the staff to collect the floating slag and avoid the water contained in the floating slag from dripping to the outside and affecting the external environment.

[0013] Further, the anoxic zone includes the 1A anoxic zone and the 7A anoxic zone. The sequencing batch zone includes the 1st sequencing batch zone and the 7th sequencing batch zone. The 1A anoxic zone is communicated with the 1st sequencing batch zone, and the 7A anoxic zone is communicated with the 7th sequencing batch zone. By adding the 1A anoxic zone and the 7A anoxic zone in the present invention, nitrifying bacteria and denitrifying bacteria can be better cultivated respectively. The bottoms of the 1st sequencing batch zone and the 7th sequencing batch zone are both communicated with the sludge thickening zone through sludge discharge pumps. The sludge at the bottoms of the 1st sequencing batch zone and the 7th sequencing batch zone is transported to the sludge thickening zone through the sludge discharge pumps. When the present invention is working, the 1st sequencing batch zone and the 7th sequencing batch zone operate alternately and intermittently. The 1st sequencing batch zone and the 7th sequencing batch zone perform stirring, aeration, pre-sedimentation, sedimentation for water discharge, sedimentation for water discharge, sedimentation for water discharge in sequence.

[0014] A municipal wastewater treatment method based on an improved MSBR process includes the following steps:

[0015] S1: When the wastewater passes through the improved MSBR tank, it first enters the 3rd pre-anoxic zone, the 2nd sludge thickening zone, and the 4th anaerobic zone, then enters the 5th anoxic zone and the 6th aerobic zone, and finally alternately enters the 1A anoxic zone, the 1st sequencing batch zone and the 7A anoxic zone, the 7th sequencing batch zone;

[0016] S2: The 1A anoxic zone, the 1st sequencing batch zone, the 7A anoxic zone, and the 7th sequencing batch zone all operate 6 cycles per day (stirring, aeration, pre-sedimentation, sedimentation for water discharge, sedimentation for water discharge, sedimentation for water discharge). The single operating cycle is 4 hours. The 2nd sludge thickening zone is always in a thickening state. The 3rd pre-anoxic zone is always in a stirring state. The 4th anaerobic zone and the 5th anoxic zone are always in a stirring state. The 6th aerobic zone is always in an aeration state. When the 1A anoxic zone and the 1st sequencing batch zone are in the states of stirring, aeration, pre-sedimentation, sedimentation for water discharge, sedimentation for water discharge, sedimentation for water discharge, the corresponding 7A anoxic zone and the 7th sequencing batch zone are in the states of sedimentation for water discharge, sedimentation for water discharge, sedimentation for water discharge, stirring, aeration, pre-sedimentation;

[0017] S3: When the 1st sequencing batch zone and the 7th sequencing batch zone are in the pre-sedimentation state, pre-sediment for 2 hours first, and then start the skimming device to remove scum through the skimming device. The liquid level gauges in the 1st sequencing batch zone and the 7th sequencing batch zone are interlocked with the pneumatic valves on the outlet pipes. If the liquid level drops by more than the set value, it indicates that siphon phenomenon has occurred in the device effluent. At this time, the outlet start valve should be closed and then opened again after 10 minutes.

[0018] S4: When the 1st sequencing batch zone and the 7th sequencing batch zone enter the sedimentation effluent state, close the air inlet valve on the air outlet weir. The air in the air hood on the air outlet weir will be discharged into the atmosphere through the drain valve under the action of water pressure, and the water level in the hood gradually rises. When the water level rises to the triangular weir plate, drainage starts.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: In the improved MSBR reaction tank of the present invention, the wastewater sequentially undergoes anaerobic and anoxic agitation, aerobic aeration, agitation, aeration, pre-sedimentation, and sedimentation effluent in the facultative zone and the sequencing batch zone, and then the total phosphorus is removed by the high-efficiency clarifier, and the autotrophic denitrification unit conducts deep denitrification to ensure that the final effluent meets the Class IV surface water standard. The present invention is provided with a first skimming pipe and a second skimming pipe compared with the current wastewater treatment device. The second skimming pipe and the first skimming pipe are controlled by the linkage component to be fixedly connected or slidably connected. When the present invention is working to remove scum, the second skimming pipe and the first skimming pipe are controlled by the linkage component to be fixed together. When the skimming device is in a non-working state, the second skimming pipe and the first skimming pipe are controlled by the linkage component to be slidably connected to facilitate the alignment of the second feed hole on the second skimming pipe with the cleaning hole. The staff can clean the inner wall of the second skimming pipe and the spiral blades inside the second skimming pipe through the cleaning mechanism, avoiding a large amount of scum adhering to the inner wall of the second skimming pipe and the spiral blades. On the one hand, it improves the service life of the second skimming pipe and the spiral blades, and on the other hand, it prevents the risk of blockage of the second skimming pipe. The cleaning mechanism in the present invention uses a soft brush and the water in the sequencing batch zone to friction and flush the spiral blades and the inner wall of the second skimming pipe. Compared with the current cleaning method, the present invention can achieve the effect of self-cleaning and automatic conveying of the cleaning waste liquid through the movement of the spiral blades themselves without disassembling the skimming device. Finally, the present invention is also provided with an aggregate cylinder. In addition to driving the spiral blades to rotate, the conveying shaft in the skimming device also drives the aggregate cylinder to rotate. After the work of removing scum is completed, if the conveying motor continues to operate for a period of time, the scum in the aggregate cylinder will be quickly dehydrated under the action of centrifugal force, facilitating the staff to collect the scum and avoiding the water contained in the scum from dripping to the outside and affecting the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the process flow chart of the present invention;

[0021] Figure 2Schematic diagram of the improved MSBR process device of the present invention;

[0022] Figure 3 First perspective installation schematic diagram of the skimming device of the present invention;

[0023] Figure 4 Second perspective installation schematic diagram of the skimming device of the present invention;

[0024] Figure 5 Structural schematic diagram of the skimming device of the present invention;

[0025] Figure 6 Installation schematic diagram of the first skimming pipe and the second skimming pipe of the present invention;

[0026] Figure 7 Structural schematic diagram of the first skimming pipe of the present invention;

[0027] Figure 8 Structural schematic diagram of the second skimming pipe of the present invention;

[0028] Figure 9 Of the present invention Figure 6 Schematic diagram of the structure of part A;

[0029] Figure 10 Structural schematic diagram of the cleaning mechanism of the present invention;

[0030] Figure 11 Internal structural schematic diagram of the sealing seat of the present invention;

[0031] Figure 12 Internal structural schematic diagram of the aggregate box of the present invention.

[0032] In the figure: 1. Foam collection device; 2. Skimming device; 21. First skimming pipe; 211. First feed hole; 212. Cleaning hole; 22. Cleaning seat; 221. Installation cavity; 222. Soft brush; 223. Sealing seat; 224. Liquid pump; 225. Installation plate; 226. Linear motor; 227. Drain pipe; 23. First fixing seat; 24. Aggregate box; 241. Return pipe; 242. Aggregate cylinder; 243. Gear box; 244. Transmission rod; 25. Second fixing seat; 251. First electromagnet; 26. Reversing motor; 27. Second skimming pipe; 271. Spiral blade; 272. Conveyor shaft; 273. Conveyor motor; 274. Second feed hole; 275. Second electromagnet; 28. End cover; 3. Liquid level gauge; 4. Pneumatic valve; 5. Air outlet weir. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment: As Figures 1-4 shown, the present invention provides a technical solution, a municipal wastewater treatment device based on an improved MSBR process. The wastewater treatment device includes a coarse grid, a lift pump house, a fine grid, an aerated grit chamber, an improved MSBR tank, a high-efficiency clarifier, an autotrophic denitrification filter, a rotary disk filter, a contact disinfection tank, and a discharge tank. The wastewater sequentially passes through the coarse grid, the lift pump house, the fine grid, the aerated grit chamber, the improved MSBR tank, the high-efficiency clarifier, the autotrophic denitrification filter, the rotary disk filter, the contact disinfection tank, and the discharge tank. The improved MSBR tank includes a No. 3 pre-anoxic zone, a No. 2 sludge thickening zone, a No. 4 anaerobic zone, a No. 5 anoxic zone, a No. 6 aerobic zone, an anoxic-aerobic zone, and a sequencing batch zone. The No. 3 pre-anoxic zone, the No. 2 sludge thickening zone, the No. 4 anaerobic zone, the No. 5 anoxic zone, the No. 6 aerobic zone, the anoxic-aerobic zone, and the sequencing batch zone are sequentially connected. A foam collection device 1, a skimming device 2, a level gauge 3, and an air outlet weir 5 are arranged in the sequencing batch zone. The water outlet of the sequencing batch zone is controlled by the air outlet weir 5. An outlet pipe is arranged at the water outlet end of the sequencing batch zone. A pneumatic valve 4 is arranged on the outlet pipe. The pneumatic valve 4 and the level gauge 3 are interlocked to ensure that no siphon phenomenon occurs during water discharge through the pneumatic valve 4 and the level gauge 3.

[0035] As Figures 3-6 shown, the skimming device 2 includes a first skimming pipe 21, a first fixing seat 23, a second fixing seat 25, a reversing motor 26, and a second skimming pipe 27. The first fixing seat 23 is fixedly installed on the inner wall of the sequencing batch zone. The second fixing seat 25 is arranged outside the sequencing batch zone and is fixedly connected to the outer wall of the sequencing batch zone through a bracket. The first skimming pipe 21 is arranged between the first fixing seat 23 and the second fixing seat 25. One end of the first skimming pipe 21 close to the first fixing seat 23 is slidably connected to the first fixing seat 23. One end of the first skimming pipe 21 close to the second fixing seat 25 is provided with an end cover 28. The end cover 28 is fixedly connected to the first skimming pipe 21 through bolts. One end of the end cover 28 close to the second fixing seat 25 is slidably connected to the second fixing seat 25. The reversing motor 26 is arranged at one end of the second fixing seat 25 away from the first skimming pipe 21. The second skimming pipe 27 is arranged inside the first skimming pipe 21. The first skimming pipe 21 and the second skimming pipe 27 are connected through a linkage assembly. The working end of the reversing motor 26 is connected to the second skimming pipe 27.

[0036] As Figures 6-8As shown, a first feed hole 211 and a cleaning hole 212 are provided at the middle position of the first skimming pipe 21. A working chamber and a conveying chamber are provided inside the second skimming pipe 27. A conveying motor 273 is provided in the working chamber, a conveying shaft 272 is provided in the conveying chamber, a spiral blade 271 is provided on the conveying shaft 272, and a second feed hole 274 is provided at one end of the conveying chamber close to the first feed hole 211.

[0037] When the skimming device 2 in the present invention is working to remove floating slag, the first feed hole 211 is aligned with the second feed hole 274. At the same time, the second skimming pipe 27 and the first skimming pipe 21 are fixed together as a whole through a linkage component. The angle between the second feed hole 274 on the second skimming pipe 27 and the first feed hole 211 on the first skimming pipe 21 and the water surface is controlled by the reversing motor 26, so as to collect the floating slag on the water surface into the conveying chamber. The conveying motor 273 drives the conveying shaft 272 and the spiral blade 271 to rotate in the conveying chamber, and then conveys the collected floating slag to the corresponding treatment area.

[0038] As Figure 6 , Figures 9-10 shown, the skimming device 2 further includes a cleaning seat 22. The cleaning seat 22 is arranged on one side of the first skimming pipe 21 close to the cleaning hole 212. A cleaning mechanism is arranged inside the cleaning seat 22. The linkage component includes a first electromagnet 251 and a second electromagnet 275. The first electromagnet 251 is embedded at one end of the second fixing seat 25 close to the end cover 28, and the second electromagnet 275 is embedded at one end of the second skimming pipe 27 close to the end cover 28. The end cover 28 is made of ferromagnetic metal. When the skimming device 2 is working to remove floating slag, the second electromagnet 275 generates a magnetic field that attracts the end cover 28 (the first electromagnet 251 is in a non-working state). At this time, the second skimming pipe 27 and the first skimming pipe 21 are fixed together as a whole through the second electromagnet 275 and the end cover 28, so that the reversing motor 26 can control the synchronous rotation of the second skimming pipe 27 and the first skimming pipe 21. When the skimming device 2 is in a non-working state, if the staff needs to clean the inside of the second skimming pipe 27, the second electromagnet 275 can be directly turned off and the first electromagnet 251 can be turned on. The end cover 28 is attracted and fixed by the first electromagnet 251. Since the second fixing seat 25 is fixedly connected to the outer wall of the sequencing batch area, when the reversing motor 26 drives the second skimming pipe 27 to rotate, the first skimming pipe 21 does not rotate. When the second feed hole 274 on the second skimming pipe 27 is aligned with the cleaning hole 212, the staff can turn on the cleaning mechanism, and the inner wall of the second skimming pipe 27 and the spiral blade 271 inside the second skimming pipe 27 can be cleaned through the cleaning mechanism, so as to avoid a large amount of floating slag adhering to the inner wall of the second skimming pipe 27 and the spiral blade 271. Through the above technical solutions, on the one hand, the service life of the second skimming pipe 27 and the spiral blade 271 is improved, and on the other hand, the risk of blockage of the second skimming pipe 27 is prevented.

[0039] As Figure 10 shown, an installation cavity 221 is provided in the cleaning base 22. The installation cavity 221 is aligned with the cleaning hole 212. A linear motor 226 is provided on the inner wall of the installation cavity 221. The cleaning mechanism includes a soft brush 222, a sealing seat 223, and a mounting plate 225. The working end of the linear motor 226 is connected to the mounting plate 225. The sealing seat 223 is arranged at one end of the mounting plate 225 close to the cleaning hole 212. One end of the sealing seat 223 close to the cleaning hole 212 is an arc structure. The sealing seat 223 is adapted to the second feed hole 274. The soft brush 222 is arranged at one end of the sealing seat 223 close to the cleaning hole 212. When the cleaning mechanism in the present invention works, the linear motor 226 will first drive the mounting plate 225 and the sealing seat 223 to move towards the direction close to the cleaning hole 212. Finally, the sealing seat 223 and the soft brush 222 will be inserted into the second feed hole 274. At the same time, the arc surface of the sealing seat 223 will be flush with the inner wall surface of the second skimming pipe 27. By driving the conveying shaft 272 and the spiral blade 271 to rotate in the conveying cavity through the conveying motor 273, the conveying shaft 272 and the spiral blade 271 will continuously rub against the soft brush 222 during the rotation process. The soft brush 222 is used to clean the conveying shaft 272 and the spiral blade 271. The sealing seat 223 is used to prevent the scum in the second skimming pipe 27 from falling into the cleaning base 22 during the process of cleaning the second skimming pipe 27.

[0040] As Figure 11 shown, a liquid pump 224 is provided below the cleaning base 22. A drain pipe 227 is further provided inside the sealing seat 223. The drain pipe 227 is connected to the liquid pump 224 through a corrugated expansion pipe. Several groups of water outlets are provided at one end of the drain pipe 227 close to the second feed hole 274. When the soft brush 222 in the present invention rubs and cleans the conveying shaft 272 and the spiral blade 271, the staff can turn on the liquid pump 224. The liquid pump 224 is used to transport the water in the sequencing area into the drain pipe 227. Finally, the water is sprayed out through the drain pipe 227. The water sprayed out through the drain pipe 227, on the one hand, flushes and cleans the inner walls of the conveying shaft 272, the spiral blade 271, and the second skimming pipe 27. On the other hand, the water entering the second skimming pipe 27 will become a medium, so that the spiral blade 271 can directly transport and discharge the scum to the outside during the rotation process. Through the above technical solutions of the present invention, the effects of self-cleaning and automatic conveying and cleaning of waste liquid can be achieved through the movement of the spiral blade 271 itself without disassembling the skimming device 2.

[0041] As Figure 12As shown, the skimming device 2 further includes an aggregate tank 24. The aggregate tank 24 is arranged outside the sequencing batch zone. The outlet end of the second skimming pipe 27 is arranged inside the aggregate tank 24. An aggregate cylinder 242 is arranged inside the aggregate tank 24. The aggregate cylinder 242 is provided with filter holes. The lower end of the aggregate tank 24 is connected to the sequencing batch zone through a reflux pipe 241. When the skimming device 2 in the present invention removes scum or performs self-cleaning, the transported scum will enter the aggregate tank 24 from the outlet end of the second skimming pipe 27. The scum is intercepted by the aggregate cylinder 242, and the water contained in the scum is re-transported into the sequencing batch zone through the reflux pipe 241.

[0042] As Figure 12 shown, a gear box 243 is further arranged inside the aggregate tank 24. The gear box 243 is fixedly connected to the top of the aggregate tank 24 through a fixed column. The conveying shaft 272 is connected to the driving end of the gear box 243. The driven end of the gear box 243 is connected to the aggregate cylinder 242 through a transmission rod 244. A speed increasing gear assembly is arranged inside the gear box 243. When the skimming device 2 in the present invention removes scum, the conveying shaft 272 not only drives the spiral blade 271 to rotate, but also drives the transmission rod 244 and the aggregate cylinder 242 to rotate. After the scum removal work is completed, the staff can let the conveying motor 273 continue to operate for a period of time. At this time, the aggregate cylinder 242 will continue to rotate, and the scum inside the aggregate cylinder 242 will be quickly dehydrated under the action of centrifugal force, so as to facilitate the staff to collect the scum and prevent the water contained in the scum from dripping to the outside and affecting the external environment.

[0043] As Figure 2 shown, the anoxic zone includes the 1A anoxic zone and the 7A anoxic zone. The sequencing batch zone includes the 1st sequencing batch zone and the 7th sequencing batch zone. The 1A anoxic zone is connected to the 1st sequencing batch zone, and the 7A anoxic zone is connected to the 7th sequencing batch zone. By adding the 1A anoxic zone and the 7A anoxic zone in the present invention, nitrifying bacteria and denitrifying bacteria can be better cultivated respectively. The bottoms of the 1st sequencing batch zone and the 7th sequencing batch zone are both connected to the 2nd sludge thickening zone through sludge discharge pumps. The sludge at the bottoms of the 1st sequencing batch zone and the 7th sequencing batch zone is transported to the 2nd sludge thickening zone through the sludge discharge pumps. When the present invention is working, the 1st sequencing batch zone and the 7th sequencing batch zone operate alternately and intermittently, and the 1st sequencing batch zone and the 7th sequencing batch zone perform stirring, aeration, pre-sedimentation, sedimentation for water discharge, sedimentation for water discharge, sedimentation for water discharge work in sequence.

[0044] Working principle of the present invention: When the wastewater passes through the improved MSBR tank, it first enters the No. 3 pre-anoxic zone, the No. 2 sludge thickening zone, and the No. 4 anaerobic zone, then enters the No. 5 anoxic zone and the No. 6 aerobic zone, and finally alternately enters the No. 1A facultative zone, the No. 1 sequencing batch zone and the No. 7A facultative zone, the No. 7 sequencing batch zone. When the No. 1 sequencing batch zone and the No. 7 sequencing batch zone are in the pre-sedimentation state, they are pre-sedimented for 2 hours first, and then the first skimming pipe 21 and the second skimming pipe 27 are rotated by the reversing motor 26, so as to collect the scum on the water surface into the second skimming pipe 27. The conveying shaft 272 and the spiral blade 271 are rotated by the conveying motor 273 to convey the collected scum into the aggregate box 24. The scum is intercepted by the aggregate cylinder 242, and the water contained in the scum is re-conveyed into the sequencing batch zone through the return pipe 241. After the scum removal work is completed, the staff can directly turn off the second electromagnet 275 and turn on the first electromagnet 251. At this time, the reversing motor 26 drives the second skimming pipe 27 to rotate, and the first skimming pipe 21 does not rotate. When the second feed hole 274 on the second skimming pipe 27 is aligned with the cleaning hole 212, the staff can turn on the cleaning mechanism to clean the inner wall of the second skimming pipe 27 and the spiral blade 271 inside the second skimming pipe 27, so as to prevent a large amount of scum from adhering to the inner wall of the second skimming pipe 27 and the spiral blade 271.

[0045] Another embodiment of the present application provides a municipal wastewater treatment method based on the improved MSBR process, including the following steps:

[0046] S1: When the wastewater passes through the improved MSBR tank, it first enters the No. 3 pre-anoxic zone, the No. 2 sludge thickening zone, and the No. 4 anaerobic zone, then enters the No. 5 anoxic zone and the No. 6 aerobic zone, and finally alternately enters the No. 1A facultative zone, the No. 1 sequencing batch zone and the No. 7A facultative zone, the No. 7 sequencing batch zone;

[0047] S2: The No. 1A facultative zone, the No. 1 sequencing batch zone, the No. 7A facultative zone, and the No. 7 sequencing batch zone all operate 6 cycles per day (stirring, aeration, pre-sedimentation, sedimentation for water discharge, sedimentation for water discharge, sedimentation for water discharge), and the single operating cycle is 4 hours. The No. 2 sludge thickening zone is always in the thickening state, the No. 3 pre-anoxic zone is always in the stirring state, the No. 4 anaerobic zone and the No. 5 anoxic zone are always in the stirring state, the No. 6 aerobic zone is always in the aeration state. When the No. 1A facultative zone and the No. 1 sequencing batch zone are in the states of stirring, aeration, pre-sedimentation, sedimentation for water discharge, sedimentation for water discharge, sedimentation for water discharge, the corresponding No. 7A facultative zone and the No. 7 sequencing batch zone are in the states of sedimentation for water discharge, sedimentation for water discharge, sedimentation for water discharge, stirring, aeration, pre-sedimentation;

[0048] S3: When the 1st sequencing batch zone and the 7th sequencing batch zone are in the pre-sedimentation state, pre-sediment for 2 hours first, and then start the skimming device 2 to remove the floating scum through the skimming device 2. The liquid level gauges 3 in the 1st sequencing batch zone and the 7th sequencing batch zone are interlocked with the pneumatic valves 4 on the outlet pipes. If the liquid level drops by more than the set value, it indicates that siphonage has occurred in the device effluent. At this time, the outlet start valve should be closed and opened again after 10 minutes.

[0049] S4: When the 1st sequencing batch zone and the 7th sequencing batch zone enter the sedimentation effluent state, close the air inlet valve on the air outlet weir 5. The air in the air hood on the air outlet weir 5 will be discharged into the atmosphere through the drain valve under the action of water pressure, and the water level in the hood gradually rises. When the water level rises to the triangular weir plate, drainage starts.

[0050] In the present invention, the liquid level gauges 3 in the 1st sequencing batch zone and the 7th sequencing batch zone are interlocked with the air inlet valves of the corresponding air outlet weirs 5 and the pneumatic valves 4 on the outlet pipes. When the air inlet valve of the air outlet weir 5 is in the open state, if the corresponding liquid level gauge 3 fluctuates by more than 0.3 m at this time, it indicates that siphonage may have occurred in the device effluent. At this time, the automatic control system issues an abnormal prompt and automatically closes the pneumatic valve 4 on the outlet pipe. After 10 minutes, the pneumatic valve 4 resumes to achieve the drainage work.

[0051] In the present invention, chemical phosphorus removal agents are added to the high-efficiency clarifier. The chemical phosphorus removal agents are generally aluminum salts, iron salts or composite inorganic phosphorus removal agents, which are selected according to the phosphorus removal effect.

[0052] In the present invention, the total nitrogen is further removed through the autotrophic denitrification process. This unit does not need to add any carbon source. The denitrification load of the autotrophic denitrification unit is generally controlled at 0.5 - 0.7 kg / (m3·d) in spring and summer, and generally controlled at 0.3 - 0.4 kg / (m3·d) in autumn and winter.

[0053] Compared with the original CAST process before transformation, for the improved MSBR process, the water quality of this unit has been significantly improved. The COD Cr has increased from the original 60 - 70 mg / L to about 50 mg / L, the SS has increased from the original about 50 mg / L to about 15 mg / L, the total nitrogen has increased from the original 20 mg / L to about 12 mg / L, and the total phosphorus has increased from about 1.5 mg / L to about 1 mg / L.

[0054] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A municipal wastewater treatment device based on a modified MSBR process, the wastewater treatment device comprises a coarse screen, a lift pump room, a fine screen, an aerated grit chamber, a modified MSBR tank, a high-efficiency clarification tank, an autotrophic denitrification filter tank, a rotary filter tank, a contact disinfection tank, and a discharge tank, characterized in that: The improved MSBR pool comprises a No. 3 pre-anoxic zone, a No. 2 sludge concentration zone, a No. 4 anaerobic zone, a No. 5 anoxic zone, a No. 6 aerobic zone, an anoxic zone, and a sequential batch zone. The No. 3 pre-anoxic zone, the No. 2 sludge concentration zone, the No. 4 anaerobic zone, the No. 5 anoxic zone, the No. 6 aerobic zone, an anoxic zone, and a sequential batch zone are sequentially connected. A foam collecting device (1), a slag skimming device (2), a liquid level meter (3), and an air outlet weir (5) are provided in the sequential batch zone. The water outlet of the sequential batch zone is controlled by the air outlet weir (5). A water outlet pipe is provided at the water outlet end of the sequential batch zone. A pneumatic valve (4) is provided on the water outlet pipe. The pneumatic valve (4) and the liquid level meter (3) are interlocked with each other. The slag skimming device (2) comprises a first slag skimming pipe (21), a first fixing seat (23), a second fixing seat (25), a reversing motor (26) and a second slag skimming pipe (27), wherein the second slag skimming pipe (27) is arranged inside the first slag skimming pipe (21); A first feeding hole (211) and a cleaning hole (212) are provided at a middle position of the first skimming pipe (21), a working chamber and a conveying chamber are provided inside the second skimming pipe (27), a conveying motor (273) is provided in the working chamber, a conveying shaft (272) is provided in the conveying chamber, and a spiral blade (271) is provided on the conveying shaft (272).

2. A municipal wastewater treatment device based on a modified MSBR process according to claim 1, characterized in that: The first fixing seat (23) is fixedly mounted on the inner wall of the sequencing area; the second fixing seat (25) is arranged outside the sequencing area and fixedly connected to the outer wall of the sequencing area through a bracket; the first skimming pipe (21) is arranged between the first fixing seat (23) and the second fixing seat (25); one end of the first skimming pipe (21) close to the first fixing seat (23) is slidably connected to the first fixing seat (23); one end of the first skimming pipe (21) close to the second fixing seat (25) is provided with an end cover (28); the end cover (28) and the first skimming pipe (21) are fixedly connected by bolts; one end of the end cover (28) close to the second fixing seat (25) is slidably connected to the second fixing seat (25); the reversing motor (26) is arranged at one end of the second fixing seat (25) away from the first skimming pipe (21); the first skimming pipe (21) and the second skimming pipe (27) are connected through a linkage assembly; and the working end of the reversing motor (26) is connected to the second skimming pipe (27).

3. A municipal wastewater treatment device based on a modified MSBR process according to claim 2, characterized in that: A second feed hole (274) is provided at one end of the conveying cavity close to the first feed hole (211); when the scum skimming device (2) is working to remove scum, the first feed hole (211) is aligned with the second feed hole (274).

4. A municipal wastewater treatment device based on a modified MSBR process according to claim 3, characterized in that: The slag skimming device (2) further comprises a cleaning seat (22) and a material collecting box (24); the cleaning seat (22) is arranged on a side of the first slag skimming pipe (21) close to the cleaning hole (212); a cleaning mechanism is arranged in the cleaning seat (22); the linkage assembly comprises a first electromagnet (251) and a second electromagnet (275); the first electromagnet (251) is embedded in one end of the second fixing seat (25) close to the end cover (28); the second electromagnet (275) is embedded in one end of the second slag skimming pipe (27) close to the end cover (28); the end cover (28) is made of ferromagnetic metal.

5. A municipal wastewater treatment device based on a modified MSBR process according to claim 4, characterized in that: The cleaning seat (22) is provided with a mounting cavity (221), the mounting cavity (221) being aligned with the cleaning hole (212), a linear motor (226) being provided on the inner wall of the mounting cavity (221), the cleaning mechanism comprising a soft brush (222), a sealing seat (223) and a mounting plate (225), the working end of the linear motor (226) being connected to the mounting plate (225), the sealing seat (223) being provided at one end of the mounting plate (225) close to the cleaning hole (212), the end of the sealing seat (223) close to the cleaning hole (212) being an arc-shaped structure, the sealing seat (223) being adapted to the second feed hole (274), and the soft brush (222) being provided at one end of the sealing seat (223) close to the cleaning hole (212).

6. A municipal wastewater treatment device based on a modified MSBR process according to claim 5, characterized in that: A liquid pump (224) is provided below the cleaning seat (22), and a drainage pipe (227) is also provided inside the sealing seat (223). The drainage pipe (227) is connected to the liquid pump (224) via a corrugated telescopic pipe, and a plurality of groups of water outlets are provided at one end of the drainage pipe (227) close to the second feed hole (274).

7. A municipal wastewater treatment device based on a modified MSBR process according to claim 3, characterized in that: The skimming device (2) further comprises a material collection box (24), wherein the material collection box (24) is arranged outside the sequential batch area, and the outlet end of the second skimming pipe (27) is arranged in the material collection box (24). A material collection barrel (242) is arranged in the material collection box (24), and filter holes are arranged on the material collection barrel (242). The lower end of the material collection box (24) is connected to the sequential batch area via a return pipe (241).

8. A municipal wastewater treatment device based on a modified MSBR process according to claim 7, characterized in that: A gear box (243) is also provided in the material collection box (24); the gear box (243) is fixedly connected to the top of the material collection box (24) via a fixing column; the conveying shaft (272) is connected to the active end of the gear box (243); and the driven end of the gear box (243) is connected to the material collection barrel (242) via a transmission rod (244).

9. A municipal wastewater treatment device based on a modified MSBR process according to claim 1, characterized in that: The anoxic zone includes anoxic zone No. 1A and anoxic zone No. 7A, and the batch zone includes batch zone No. 1 and batch zone No.

7. The anoxic zone No. 1A is connected with batch zone No. 1, and the anoxic zone No. 7A is connected with batch zone No.

7. The bottoms of batch zone No. 1 and batch zone No. 7 are connected with sludge concentration zone No. 2 through sludge pumps, and the sludge at the bottom of batch zone No. 1 and batch zone No. 7 is transported to sludge concentration zone No. 2 through the sludge pumps.

10. A municipal wastewater treatment method based on a modified MSBR process. The present invention is based on a municipal wastewater treatment device based on a modified MSBR process according to claim 9, characterized in that: The following steps are involved: S1: When the wastewater passes through the improved MSBR pool, it first enters the No. 3 pre-anoxic zone, No. 2 sludge concentration zone, No. 4 anaerobic zone, then enters the No. 5 anoxic zone, No. 6 aerobic zone, and finally alternately enters the No. 1A facultative anoxic zone, No. 1 batch zone, and the No. 7A facultative anoxic zone, No. 7 batch zone; S2: No. 1A facultative anoxic zone, No. 1 batch zone and No. 7A facultative anoxic zone, No. 7 batch zone all run 6 cycles a day, including: stirring, aeration, pre-sedimentation, sedimentation effluent, sedimentation effluent, sedimentation effluent, and a single operation cycle is 4 hours. No. 2 sludge concentration zone is always in a concentration state, No. 3 pre-anoxic zone is always in a stirring state, No. 4 anaerobic zone and No. 5 anoxic zone are always in a stirring state, No. 6 aerobic zone is always in an aeration state, and when No. 1A facultative anoxic zone and No. 1 batch zone are in the stirring, aeration, pre-sedimentation, sedimentation effluent, sedimentation effluent, and sedimentation effluent states, the corresponding No. 7A facultative anoxic zone and No. 7 batch zone are in the sedimentation effluent, sedimentation effluent, sedimentation effluent, stirring, aeration, and pre-sedimentation states; S3: When the No. 1 batch area and the No. 7 batch area are in the pre-settling state, the scum is removed by the scum skimming device (2); S4: When the No. 1 batch area and the No. 7 batch area enter the sedimentation and water discharge state, the air inlet valve on the air water discharge weir (5) is closed to achieve water discharge.

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