Municipal wastewater treatment device and method based on improved MSBR process

Abstract

The invention discloses a municipal wastewater treatment device and method based on an improved MSBR process, and relates to the technical field of environmental engineering sewage treatment, the wastewater treatment device comprises a coarse screen, a lifting pump room, a fine screen, an aerated grit chamber, an improved MSBR tank, an efficient clarification tank, an autotrophic denitrification filter tank, a turntable filter tank, a contact disinfection tank and a discharge tank, wastewater in the improved MSBR reaction tank is sequentially subjected to anaerobic stirring, anoxic stirring, aerobic aeration, stirring in the facultative zone and the sequencing batch zone, aeration, pre-precipitation, precipitation and water discharging, then passes through the efficient clarification tank to remove total phosphorus, and passes through the autotrophic denitrification unit to perform deep denitrification, so that the final effluent is ensured to reach the IV-class standard of surface water; according to the skimming device, the first skimming pipe and the second skimming pipe are arranged, and the second skimming pipe and the first skimming pipe are controlled to be fixedly connected or slidably connected through the linkage assembly, so that the inner wall of the second skimming pipe and the spiral blades in the second skimming pipe can be conveniently cleaned through the cleaning mechanism.

Description

Technical Field

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

[0003] Some of the sewage treatment plants built in the early stage have adopted SBR and the CAST process based on it. With the increase of water volume and the improvement of emission standards, they need to be upgraded. MSBR process is a sewage treatment process developed on the basis of the original A2O process and SBR process. It makes full use of the advantages of both, not only ensuring the water quality of the effluent, but also saving space. This process has gradually become popular, but there are corresponding defects, such as scum still on the surface of the sequential batch, easy to produce siphon site and difficulty in culturing bacteria in the sequential batch area.

[0004] In addition, the current wastewater treatment devices are equipped with skimming devices in areas such as sedimentation tanks. For example, the patent "CN117643749A A self-adaptive sludge removal circumferential inlet and outlet secondary sedimentation tank" discloses a method for removing scum on the water surface, but the technical solution of the 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 working for a long time, a large amount of scum will be attached 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, it will not only be prone to blockage risks during subsequent use, but also affect the life of the skimming pipe and the spiral blades due to rust and other reasons; finally, after the scum is discharged, since the scum itself contains more water, every time the staff collects the scum, sewage will drip into the outside world, polluting the environment, and this phenomenon is tantamount to increasing the subsequent cleaning workload of the staff. Summary of the invention

[0005] The object 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.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a municipal wastewater treatment device based on the improved MSBR process, the wastewater treatment device comprises a coarse screen, a lift pump room, a fine screen, an aerated grit tank, an improved MSBR pool, a high-efficiency clarification tank, an autotrophic denitrification filter, a rotary filter, a contact disinfection tank, and a discharge tank, and the wastewater passes through the coarse screen, the lift pump room, the fine screen, the aerated grit tank, the improved MSBR pool, a high-efficiency clarification tank, an autotrophic denitrification filter, a rotary filter, a contact disinfection tank, and a discharge tank in sequence, and the improved MSBR pool comprises a No. 3 pre-anoxic zone, a No. 2 sewage zone, and a No. 3 pre-anoxic zone. The sludge concentration area, No. 4 anaerobic area, No. 5 anoxic area, No. 6 aerobic area, facultative anoxic area, and sequential batch area, the No. 3 pre-anoxic area, No. 2 sludge concentration area, No. 4 anaerobic area, No. 5 anoxic area, No. 6 aerobic area, facultative anoxic area, and sequential batch area are connected in sequence, the sequential batch area is provided with a foam collection device, a slag skimming device, a liquid level gauge and an air outlet weir, the water outlet of the sequential batch area is controlled by the air outlet weir, the water outlet end of the sequential batch area is provided with an outlet pipe, the outlet pipe is provided with a pneumatic valve, the pneumatic valve and the liquid level gauge are interlocked, and the pneumatic valve and the liquid level gauge are used to ensure that no siphoning occurs during water outlet.

[0007] Furthermore, 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 area, the second fixing seat is arranged outside the sequencing batch area and is fixedly connected to the outer wall of the sequencing batch area 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, one end of the first skimming pipe close to the second fixing seat is provided with an end cover, the end cover is fixedly connected to the first skimming pipe by bolts, and one end of the end cover close to the second fixing seat is connected to the second fixing seat The fixed seat is slidably connected, the reversing motor is arranged at one end of the second fixed 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 component, the working end of the reversing motor is connected to the second skimming pipe, and the linkage component is convenient for the staff to control whether the second skimming pipe and the first skimming pipe are fixedly connected or slidably connected according to needs. When the present invention is in the work of removing scum, the second skimming pipe is fixed together with the first skimming pipe through the linkage component, and the first skimming pipe and the second skimming pipe are rotated by the reversing motor to remove the scum on the water surface.

[0008] Furthermore, a first feed hole and a cleaning hole are provided at a middle position of the first skimming pipe, a working chamber and a conveying chamber are provided inside the second skimming pipe, a conveying motor is provided in the working chamber, a conveying shaft is provided in the conveying chamber, a spiral blade is provided on the conveying shaft, and a second feed hole is provided at one end of the conveying chamber close to the first feed hole. When the skimming device in the present invention is working to remove scum, the first feed hole is aligned with the second feed hole, and the angle between the second feed hole on the second skimming pipe and the first feed hole on the first 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, and the conveying shaft and the spiral blade are driven to rotate in the conveying chamber by the conveying motor, so as to convey the collected scum to the corresponding treatment area.

[0009] Furthermore, the skimming device also includes a cleaning seat, which is arranged on a side of the first skimming tube close to the cleaning hole, and a cleaning mechanism is arranged in the cleaning seat. The linkage assembly includes a first electromagnet and a second electromagnet, and the first electromagnet is embedded in one end of the second fixing seat close to the end cover, and the second electromagnet is embedded in one end of the second skimming tube close to the end cover. The end cover is made of ferromagnetic metal. When the skimming device is working to remove scum, the second electromagnet will generate a set of magnetic fields to attract the end cover (the first electromagnet is in a non-working state). At this time, the second skimming tube and the first skimming tube are fixed together to form a whole through the second electromagnet and the end cover, so that the reversing motor can control the second skimming tube and the first skimming tube to rotate synchronously. When the skimming device is in a non-working state When the second skimming pipe is in the unlocked state, if the staff needs to clean the inside of the second skimming pipe, the second electromagnet can be directly closed and the first electromagnet can be opened. The end cover can be fixed by the first electromagnet. Since the second fixing seat is fixedly connected to the outer wall of the sequencing area, the first skimming pipe does not rotate when the reversing motor drives the second skimming pipe to rotate. When the second feed hole on the second skimming pipe is aligned with the cleaning hole, the staff can open the cleaning mechanism to clean the inner wall of the second skimming pipe and the spiral blades inside the second skimming pipe to avoid a large amount of floating scum adhering to the inner wall and spiral blades of the second skimming pipe. Through the above technical solution, on the one hand, the service life of the second skimming pipe and the spiral blades is improved, and on the other hand, the risk of blockage of the second skimming pipe is prevented.

[0010] Furthermore, an installation cavity is provided in the cleaning seat, and 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 comprises 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 provided at one end of the mounting plate close to the cleaning hole. The end of the sealing seat close to the cleaning hole is an arc-shaped structure. The sealing seat is adapted to the second feed hole. The soft brush is provided at one end of the sealing seat close to the cleaning hole. When the cleaning mechanism of the present invention is working, the linear motor will first drive the mounting plate and the sealing seat to move in the direction close to the cleaning hole, and 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. The conveying motor drives the conveying shaft and the spiral blades to rotate in the conveying cavity. The conveying shaft and the spiral blades will continuously rub against the soft brush during rotation. The conveying shaft and the spiral blades are cleaned by the soft brush. The sealing seat prevents the scum in the second skimming pipe from falling into the cleaning seat during the cleaning of the second skimming pipe.

[0011] Furthermore, a liquid pump is provided under the cleaning seat, and a drain pipe is also provided inside the sealing seat. The drain pipe and the liquid pump are connected by a corrugated telescopic tube, and a plurality of water outlets are provided at one end of the drain pipe close to the second feed hole. When the soft brush in the present invention is used for friction cleaning of the conveying shaft and the spiral blades, the staff can turn on the liquid pump, and the water in the batch area is transported to the drain pipe through the liquid pump, and finally the water is sprayed out through the drain pipe. On the one hand, the water sprayed through the drain pipe flushes and cleans the conveying shaft, the spiral blades and the inner wall of the second skimming pipe. On the other hand, the water entering the second skimming pipe becomes a medium so that the spiral blades can directly transport the scum to the outside during the rotation. Through the above technical scheme, the present invention can achieve the effect of self-cleaning and automatic transportation of cleaning waste liquid through the movement of the spiral blades themselves without disassembling the skimming device.

[0012] Furthermore, the skimming device also includes an aggregate box, which is arranged on the outside of the sequencing batch area, and the outlet end of the second skimming pipe is arranged in the aggregate box, and a collection barrel is arranged in the aggregate box, and filter holes are arranged on the collection barrel. The lower end of the aggregate box is connected with the sequencing batch area through a reflux pipe. When the skimming device in the present invention is removing scum or self-cleaning, the transported scum will enter the aggregate box from the outlet end of the second skimming pipe, and the scum will be intercepted by the collection barrel, and the moisture contained in the scum will be re-transported to the sequencing batch area through the reflux pipe.

[0013] Furthermore, a gear box is also provided in the aggregate box, and the gear box is fixedly connected to the top of the aggregate box through a fixed column, the conveying shaft is connected to the active end of the gear box, and the driven end of the gear box is connected to the aggregate barrel through a transmission rod. A speed increasing gear assembly is provided in the gear box. When the scum skimming device in the present invention is removing scum, the conveying shaft not only drives the spiral blades to rotate, but also drives the transmission rod and the aggregate barrel to rotate. When the scum removal work is completed, the staff can let the conveying motor continue to run for a period of time. At this time, the aggregate barrel will continue to rotate, and the scum in the aggregate barrel will be quickly dehydrated under the action of centrifugal force, so as to facilitate the staff to collect the scum and prevent the moisture contained in the scum from dripping to the outside and affecting the external environment.

[0014] Furthermore, 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 to batch zone No. 1, and the anoxic zone No. 7A is connected to batch zone No. 7. The present invention can better cultivate nitrifying bacteria and denitrifying bacteria respectively by adding anoxic zone No. 1A and anoxic zone No. 7A. The bottoms of batch zone No. 1 and batch zone No. 7 are both connected to sludge concentrating zone No. 1 through a sludge pump, and the sludge at the bottom of batch zone No. 1 and batch zone No. 7 is transported to sludge concentrating zone No. 1 through the sludge pump. When the present invention is working, batch zone No. 1 and batch zone No. 7 are operated alternately and intermittently, and batch zone No. 1 and batch zone No. 7 perform stirring, aeration, pre-sedimentation, sedimentation water discharge, sedimentation water discharge, and sedimentation water discharge in turn.

[0015] A method for treating municipal wastewater based on a modified MSBR process comprises the following steps:

[0016] 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;

[0017] S2: No. 1A facultative anoxic zone, No. 1 batch zone and No. 7A facultative anoxic zone, No. 7 batch zone all run 6 cycles per day (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 a 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 sedimentation effluent, sedimentation effluent, sedimentation effluent, stirring, aeration, and pre-sedimentation states;

[0018] S3: When batch area No. 1 and batch area No. 7 are in the pre-settling state, pre-settling is carried out for 2 hours, and then the skimming device is started to remove the floating scum. The liquid level gauges in batch area No. 1 and batch area No. 7 are interlocked with the pneumatic valves on the outlet pipes. If the liquid level drops beyond the set value, it indicates that the outlet water of the device has siphoning. At this time, the outlet start valve should be closed and opened again after 10 minutes.

[0019] S4: When batch area No. 1 and batch area No. 7 enter the sedimentation and water discharge 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. The water level in the hood will gradually rise. When the water level rises to the triangular weir plate, drainage will begin.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the wastewater in the improved MSBR reaction tank of the present invention is sequentially subjected to anaerobic and anoxic stirring, aerobic aeration, stirring, aeration, pre-sedimentation, and sedimentation of the effluent in the facultative and batch zones, and then the total phosphorus is removed by the high-efficiency clarification tank, and the autotrophic denitrification unit is subjected to deep denitrification to ensure that the final effluent meets the surface water Class IV standard. Compared with the current wastewater treatment device, the present invention is provided with a first skimming pipe and a second skimming pipe, and the second skimming pipe is fixedly connected or slidably connected to the first skimming pipe through a linkage component. When the present invention is in the scum removal work, the second skimming pipe is fixedly connected to the first skimming pipe through the linkage component. When the skimming device is in a non-working state, the second skimming pipe is slidably connected to the first skimming pipe through the linkage component, so as 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 inside the second skimming pipe through the cleaning mechanism. The blades are cleaned to prevent a large amount of scum from being attached to the inner wall of the second skimming pipe and the spiral blades. On the one hand, the service life of the second skimming pipe and the spiral blades is improved, and on the other hand, the risk of clogging of the second skimming pipe is prevented. The cleaning mechanism in the present invention uses a soft brush and water in the sequencing area to rub 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 self-cleaning and automatic conveying of cleaning waste liquid through the movement of the spiral blades themselves without disassembling the skimming device. Finally, the present invention is also provided with a collecting barrel. In addition to driving the spiral blades to rotate, the conveying shaft in the skimming device also drives the collecting barrel to rotate. After the scum removal work is completed, if the conveying motor continues to run for a period of time, the scum in the collecting barrel will be quickly dehydrated under the action of centrifugal force, so as to facilitate the staff to collect the scum and prevent the moisture contained in the scum from dripping to the outside and affecting the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a process flow chart of the present invention;

[0022] Figure 2This is a schematic diagram of the improved MSBR process device of the present invention;

[0023] Figure 3 This is a schematic diagram of the installation of the slag skimming device of the present invention from a first perspective;

[0024] Figure 4 This is a schematic diagram of the installation of the slag skimming device of the present invention from a second viewing angle;

[0025] Figure 5 It is a schematic structural diagram of the slag skimming device of the present invention;

[0026] Figure 6 It is a schematic diagram of the installation of the first skimming pipe and the second skimming pipe of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the first skimming pipe of the present invention;

[0028] Figure 8 It is a schematic diagram of the structure of the second skimming pipe of the present invention;

[0029] Fig. 9 For the present invention Figure 6 Schematic diagram of the structure of the middle A part;

[0030] Fig.10 It is a schematic diagram of the cleaning mechanism structure of the present invention;

[0031] Fig.11 It is a schematic diagram of the internal structure of the sealing seat of the present invention;

[0032] Fig.12 It is a schematic diagram of the internal structure of the aggregate box of the present invention.

[0033] In the figure: 1. foam collecting device; 2. skimming device; 21. first skimming pipe; 211. first feeding hole; 212. cleaning hole; 22. cleaning seat; 221. mounting cavity; 222. soft brush; 223. sealing seat; 224. liquid pump; 225. mounting plate; 226. linear motor; 227. drain pipe; 23. first fixed seat; 24. collecting box; 241. return pipe; 242. collecting barrel; 243. gear box; 244. transmission rod; 25. second fixed seat; 251. first electromagnet; 26. reversing motor; 27. second skimming pipe; 271. spiral blade; 272. conveying shaft; 273. conveying motor; 274. second feeding hole; 275. second electromagnet; 28. end cover; 3. liquid level meter; 4. pneumatic valve; 5. air outlet weir. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example: Figure 1-Figure 4 As shown, the present invention provides a technical solution, a municipal wastewater treatment device based on the improved MSBR process, the wastewater treatment device includes a coarse screen, a lift pump room, a fine screen, an aerated grit tank, an improved MSBR pool, a high-efficiency clarification tank, an autotrophic denitrification filter, a rotary filter, a contact disinfection tank, and a discharge tank. The wastewater passes through the coarse screen, the lift pump room, the fine screen, the aerated grit tank, the improved MSBR pool, a high-efficiency clarification tank, an autotrophic denitrification filter, a rotary filter, a contact disinfection tank, and a discharge tank in sequence. The improved MSBR pool includes a No. 3 pre-anoxic zone, a No. 2 sludge thickening zone, and a No. 3 pre-anoxic zone. Zone, No. 4 anaerobic zone, No. 5 anoxic zone, No. 6 aerobic zone, facultative anoxic zone, and sequencing batch zone, No. 3 pre-anoxic zone, No. 2 sludge concentration zone, No. 4 anaerobic zone, No. 5 anoxic zone, No. 6 aerobic zone, facultative anoxic zone, and sequencing batch zone are connected in sequence, and a foam collecting device 1, a slag skimming device 2, a liquid level meter 3 and an air outlet weir 5 are arranged in the sequencing batch zone, and the water outlet of the sequencing batch zone is controlled by the air outlet weir 5, and a water outlet pipe is arranged at the water outlet end of the sequencing batch zone, and a pneumatic valve 4 is arranged on the water outlet pipe, and the pneumatic valve 4 and the liquid level meter 3 are interlocked with each other, and the pneumatic valve 4 and the liquid level meter 3 are used to ensure that no siphoning phenomenon occurs when the water is discharged.

[0036] like Figure 3-Figure 6 As shown, the slag skimming device 2 includes a first slag skimming pipe 21, a first fixed seat 23, a second fixed seat 25, a reversing motor 26 and a second slag skimming pipe 27. The first fixed seat 23 is fixedly mounted on the inner wall of the sequencing area, the second fixed seat 25 is arranged outside the sequencing area and is fixedly connected to the outer wall of the sequencing area through a bracket, the first slag skimming pipe 21 is arranged between the first fixed seat 23 and the second fixed seat 25, and one end of the first slag skimming pipe 21 close to the first fixed seat 23 is slidably connected to the first fixed seat 23, and the first slag skimming pipe 21 close to the first fixed seat 23 is slidably connected to the first fixed seat 23. An end cover 28 is provided at one end near the second fixed seat 25, and the end cover 28 is fixedly connected to the first skimming pipe 21 by bolts. The end of the end cover 28 close to the second fixed seat 25 is slidably connected to the second fixed seat 25. The reversing motor 26 is provided at the end of the second fixed seat 25 away from the first skimming pipe 21. The second skimming pipe 27 is provided inside the first skimming pipe 21. The first skimming pipe 21 and the second skimming pipe 27 are connected by a linkage assembly, and the working end of the reversing motor 26 is connected to the second skimming pipe 27.

[0037] like Figure 6-Figure 8As shown, a first feed hole 211 and a cleaning hole 212 are arranged at the middle position of the first skimming pipe 21, a working chamber and a conveying chamber are arranged inside the second skimming pipe 27, a conveying motor 273 is arranged in the working chamber, a conveying shaft 272 is arranged in the conveying chamber, a spiral blade 271 is arranged on the conveying shaft 272, and a second feed hole 274 is arranged at one end of the conveying chamber close to the first feed hole 211.

[0038] When the skimming device 2 in the present invention is working to remove scum, the first feed hole 211 is aligned with the second feed hole 274, and the second skimming pipe 27 and the first skimming pipe 21 are fixed together to form a whole through a linkage assembly. The reversing motor 26 controls 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, so that the scum on the water surface is collected into the conveying chamber, and the conveying motor 273 drives the conveying shaft 272 and the spiral blade 271 to rotate in the conveying chamber, thereby conveying the collected scum to the corresponding processing area.

[0039] like Figure 6 , Figure 9-10 As shown, the slag skimming device 2 also includes a cleaning seat 22, which is arranged on a side of the first slag skimming tube 21 close to the cleaning hole 212, and a cleaning mechanism is arranged in the cleaning seat 22. The linkage assembly includes 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, and the second electromagnet 275 is embedded in one end of the second slag skimming tube 27 close to the end cover 28. The end cover 28 is made of ferromagnetic metal. When the slag skimming device 2 is working to remove slag, the second electromagnet 275 will generate a set of magnetic fields that attract the end cover 28 (the first electromagnet 251 is in a non-working state). At this time, the second slag skimming tube 27 and the first slag skimming tube 21 are fixed together to form a whole through the second electromagnet 275 and the end cover 28, so that the reversing motor 26 controls the second slag skimming tube 27 and the first slag skimming tube 21 to rotate synchronously. When the slag 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 closed and the first electromagnet 251 can be turned on. The end cover 28 is fixedly attracted by the first electromagnet 251. Since the second fixing seat 25 is fixedly connected to the outer wall of the sequencing area, the first skimming pipe 21 does not rotate when the reversing motor 26 drives the second skimming pipe 27 to 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 use the cleaning mechanism to clean the inner wall of the second skimming pipe 27 and the spiral blades 271 inside the second skimming pipe 27 to avoid a large amount of scum being attached to the inner wall of the second skimming pipe 27 and the spiral blades 271. Through the above technical solution, on the one hand, the service life of the second skimming pipe 27 and the spiral blades 271 is improved, and on the other hand, the risk of blockage of the second skimming pipe 27 is prevented.

[0040] like Fig.10 As shown, a mounting cavity 221 is provided in the cleaning seat 22, and the mounting cavity 221 is aligned with the cleaning hole 212. A linear motor 226 is provided on the inner wall of the mounting 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 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 is an arc-shaped structure. The sealing seat 223 is adapted to the second feed hole 274. The soft brush 222 is provided at one end of the sealing seat 223 close to the cleaning hole 212. When the cleaning mechanism in the present invention is working, the linear motor 226 will first drive The mounting plate 225 and the sealing seat 223 move toward the direction approaching the cleaning hole 212, and finally the sealing seat 223 and the soft brush 222 are inserted into the second feed hole 274, and at the same time, the arc surface of the sealing seat 223 is flush with the inner wall surface of the second skimming pipe 27, and the conveying shaft 272 and the spiral blade 271 are driven to rotate in the conveying chamber by the conveying motor 273. The conveying shaft 272 and the spiral blade 271 will continuously rub against the soft brush 222 during the rotation, and the conveying shaft 272 and the spiral blade 271 are cleaned by the soft brush 222, and the sealing seat 223 is used to prevent the scum in the second skimming pipe 27 from falling into the cleaning seat 22 during the cleaning process of the second skimming pipe 27.

[0041] like Fig.11 As shown, a liquid pump 224 is arranged below the cleaning seat 22, and a drain pipe 227 is also arranged inside the sealing seat 223. The drain pipe 227 is connected to the liquid pump 224 through a corrugated telescopic tube, and a plurality of water outlets are arranged at one end of the drain pipe 227 close to the second feed hole 274. When the soft brush 222 of the present invention rubs and cleans the conveying shaft 272 and the spiral blade 271, the staff can turn on the liquid pump 224, and the water in the batch area is conveyed to the drain pipe 227 through the liquid pump 224, and finally the water is discharged through the drain pipe. 227 sprays water. On the one hand, the water sprayed through the drain pipe 227 flushes and cleans the conveying shaft 272, the spiral blades 271 and the inner wall of the second skimming pipe 27. On the other hand, the water entering the second skimming pipe 27 becomes a medium so that the spiral blades 271 can directly transport the scum to the outside during the rotation. Through the above technical solution, the present invention can achieve the effect of self-cleaning and automatic transportation of cleaning waste liquid through the movement of the spiral blades 271 itself without disassembling the skimming device 2.

[0042] like Fig.12As shown, the skimming device 2 also includes an aggregate box 24, which is arranged on the outside of the sequencing batch area, and the outlet end of the second skimming pipe 27 is arranged in the aggregate box 24, and a collection barrel 242 is arranged in the aggregate box 24, and the collection barrel 242 is provided with filter holes. The lower end of the aggregate box 24 is connected with the sequencing batch area through a return pipe 241. When the skimming device 2 in the present invention is removing scum or self-cleaning, the transported scum will enter the aggregate box 24 from the outlet end of the second skimming pipe 27, and the scum will be intercepted by the collection barrel 242, and the moisture contained in the scum will be re-transported to the sequencing batch area through the return pipe 241.

[0043] like Fig.12 As shown, a gear box 243 is also provided in the collection box 24, and the gear box 243 is fixedly connected to the top of the collection box 24 through a fixed column, and 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 collection barrel 242 through a transmission rod 244. A speed increasing gear assembly is provided in the gear box 243. When the scum skimming device 2 of the present invention is removing scum, the conveying shaft 272 not only drives the spiral blade 271 to rotate, but also drives the transmission rod 244 and the collection barrel 242 to rotate. When the scum removal work is completed, the staff can let the conveying motor 273 continue to run for a period of time. At this time, the collection barrel 242 will continue to rotate, and the scum in the collection barrel 242 will be quickly dehydrated under the action of centrifugal force, so as to facilitate the staff to collect the scum and prevent the moisture contained in the scum from dripping to the outside and affecting the external environment.

[0044] like Figure 2 As shown, the facultative anoxic zone includes facultative anoxic zone No. 1A and facultative anoxic zone No. 7A, the batch zone includes batch zone No. 1 and batch zone No. 7, the facultative anoxic zone No. 1A is connected with batch zone No. 1, and the facultative anoxic zone No. 7A is connected with batch zone No. 7. The present invention can better cultivate nitrifying bacteria and denitrifying bacteria respectively by adding facultative anoxic zone No. 1A and facultative anoxic zone No. 7A, the bottoms of batch zone No. 1 and batch zone No. 7 are connected with sludge concentrating 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 concentrating zone No. 2 through the sludge pumps. When the present invention is working, batch zone No. 1 and batch zone No. 7 are alternately operated intermittently, and batch zone No. 1 and batch zone No. 7 perform stirring, aeration, pre-sedimentation, sedimentation water discharge, sedimentation water discharge, and sedimentation water discharge in turn.

[0045] The working principle of the present invention is as follows: when the wastewater passes through the improved MSBR pool, it first enters the No. 3 pre-anoxic zone, the No. 2 sludge concentration zone, the No. 4 anaerobic zone, then enters the No. 5 anoxic zone, the No. 6 aerobic zone, and finally alternately enters the No. 1A facultative anoxic zone, the No. 1 batch zone, the No. 7A facultative anoxic zone, and the No. 7 batch zone. When the No. 1 batch zone and the No. 7 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 driven to rotate by the reversing motor 26, and then the scum on the water surface is collected into the second skimming pipe 27, and the conveying motor 273 drives the conveying shaft 272 and the spiral blade 271 to rotate, so as to convey the collected scum to the aggregate box 24, and then the aggregate is collected. The cylinder 242 intercepts the scum, and the moisture contained in the scum is re-transported to the sequencing area through the reflux pipe 241. When the scum removal work is completed, the staff can directly close 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 will 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 blades 271 inside the second skimming pipe 27 through the cleaning mechanism to avoid a large amount of scum attached to the inner wall of the second skimming pipe 27 and the spiral blades 271.

[0046] Another embodiment of the present application provides a municipal wastewater treatment method based on a modified MSBR process, comprising the following steps:

[0047] S1: When the wastewater passes through the modified 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;

[0048] S2: No. 1A facultative anoxic zone, No. 1 batch zone and No. 7A facultative anoxic zone, No. 7 batch zone all run 6 cycles per day (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 a 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 sedimentation effluent, sedimentation effluent, sedimentation effluent, stirring, aeration, and pre-sedimentation states;

[0049] S3: When batch area No. 1 and batch area No. 7 are in the pre-settling state, pre-settling is carried out for 2 hours, and then the scum skimmer 2 is started to remove the scum. The liquid level gauge 3 in batch area No. 1 and batch area No. 7 and the pneumatic valve 4 on the outlet pipe are interlocked. If the liquid level drops beyond the set value, it indicates that the outlet water of the device has siphoning. At this time, the outlet start valve should be closed and opened again after 10 minutes.

[0050] S4: When batch area No. 1 and batch area No. 7 enter the sedimentation and water discharge 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. The water level in the hood will gradually rise. When the water level rises to the triangular weir plate, drainage will begin.

[0051] In the present invention, the liquid level gauges 3 in batch area No. 1 and batch area No. 7 are interlocked with the corresponding air outlet weir 5 air inlet valve and the pneumatic valve 4 on the outlet pipe. When the air inlet valve of the air outlet weir 5 is in an open state, if the corresponding liquid level gauge 3 fluctuates by more than 0.3m at this time, it indicates that siphonage may have occurred in the water outlet of the device. 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 is restored to achieve drainage.

[0052] The present invention adds a chemical dephosphorization agent into a high-efficiency clarification tank. The chemical dephosphorization agent is generally an aluminum salt, an iron salt or a composite inorganic phosphorus dephosphorization agent, which is selected according to the dephosphorization effect.

[0053] The present invention further removes total nitrogen through the autotrophic denitrification process. The 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 0.3-0.4 kg / (m3·d) in autumn and winter.

[0054] Compared with the CAST process before the transformation, the water quality of the unit has been significantly improved after the improved MSBR process. Cr It increased from the original 60-70 mg / L to about 50 mg / L, SS increased from the original about 50 mg / L to about 15 mg / L, total nitrogen increased from the original 20 mg / L to about 12 mg / L, and total phosphorus increased from about 1.5 mg / L to about 1 mg / L.

[0055] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. The embodiments should therefore be considered exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

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 arranged 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 arranged at the water outlet end of the sequential batch zone. A pneumatic valve (4) is arranged on the water outlet pipe. The pneumatic valve (4) and the liquid level meter (3) are interlocked with each other.

2. A municipal wastewater treatment device based on a modified MSBR process according to claim 1, characterized in that: The slag skimming device (2) comprises a first slag skimming pipe (21), a first fixed seat (23), a second fixed seat (25), a reversing motor (26) and a second slag skimming pipe (27), wherein the first fixed seat (23) is fixedly mounted on the inner wall of the sequencing batch area, the second fixed seat (25) is arranged outside the sequencing batch area and is fixedly connected to the outer wall of the sequencing batch area through a bracket, the first slag skimming pipe (21) is arranged between the first fixed seat (23) and the second fixed seat (25), one end of the first slag skimming pipe (21) close to the first fixed seat (23) is slidably connected to the first fixed seat (23), and the first slag skimming pipe (21) close to the second fixed seat (25) is slidably connected to the first fixed seat (23). An end cover (28) is provided at one end of the second fixed seat (25), and the end cover (28) is fixedly connected to the first skimming pipe (21) by bolts. The end of the end cover (28) close to the second fixed seat (25) is slidably connected to the second fixed seat (25). The reversing motor (26) is arranged at an end of the second fixed 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 by 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 first feed hole (211) and a cleaning hole (212) are arranged at the middle position of the first skimming pipe (21); a working chamber and a conveying chamber are arranged inside the second skimming pipe (27); a conveying motor (273) is arranged in the working chamber; a conveying shaft (272) is arranged in the conveying chamber; a spiral blade (271) is arranged on the conveying shaft (272); a second feed hole (274) is arranged at one end of the conveying chamber close to the first feed hole (211); when the 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) is aligned with the cleaning hole (212), a linear motor (226) is provided on the inner wall of the mounting cavity (221), the cleaning mechanism comprises 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 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) is an arc-shaped structure, the sealing seat (223) is adapted to the second feed hole (274), and the soft brush (222) is 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 arranged below the cleaning seat (22), and a drain pipe (227) is also arranged inside the sealing seat (223). The drain pipe (227) is connected to the liquid pump (224) via a corrugated telescopic tube, and a plurality of groups of water outlets are arranged at one end of the drain 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), and a material collection barrel (242) is arranged in the material collection box (24), and filter holes are arranged on the material collection barrel (242), and the lower end of the material collection box (24) is connected to the sequential batch area through a reflux 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). 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 per day (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 a 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 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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