Advanced sewage treatment device
By designing a sewage depth treatment device with automatic pH adjustment and flocculation reaction, the problems of large equipment, high energy consumption and inability to achieve continuous reactions in the prior art are solved, and the efficiency and economicality of sewage treatment are achieved.
Patent Information
- Application Number
- CN202411807670.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-02-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the existing sewage deep treatment technology, a large number of sewage treatment tanks and mixing equipment are required, resulting in high energy consumption, high cost and inability to achieve continuous reactions.
A sewage depth treatment device is designed to realize automatic pH adjustment, stirring and flocculant addition through sewage pipes to achieve continuous reaction. The device includes a pH detection head, a flowmeter, an acid and alkaline mixture pipe, a stirring mechanism and a flocculant mixture pipe, and the pH value and flocculant flow rate are adjusted in real time through the control device.
Automatic pH adjustment and flocculation reaction of sewage during transportation is realized, which reduces sewage treatment costs, improves treatment efficiency, and reduces the energy consumption of equipment.
Smart Images
Figure CN119430420A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of sewage treatment, and in particular is a sewage deep treatment device. Background Art
[0002] The gradual increase in people's awareness of environmental protection is a very positive global trend. In the existing technology, there are relatively comprehensive discharge and treatment standards for sewage treatment. In terms of deep sewage treatment, a common method is to add flocculants to sewage so that the fine suspended matter and colloids in the sewage aggregate to form larger floc particles, and then remove these floc particles from the sewage by sedimentation or filtration. Different coagulants have their appropriate pH range. Taking polyaluminium chloride as an example, it has a better coagulation effect when the pH value is about 6-8. If the pH value is not within this range, the morphology of the hydrolysis product of the coagulant will change, resulting in a poor coagulation effect and failure to remove suspended matter and colloids in sewage. In the prior art, a certain amount of sewage is usually collected in a sewage treatment tank first, and then alkaline / acidic agents are added according to the pH value of the sewage collected in the pretreatment tank to carry out stirring and mixing reaction, and the pH value is adjusted to be suitable for the flocculation reaction, and then a flocculant is added for flocculation. This operation method, on the one hand, requires the preparation of a larger sewage treatment tank, and on the other hand, the reaction time is long, the volume of the stirring equipment is large, the energy consumption is large, and continuous reaction cannot be achieved. Because of the inability to react continuously, multiple sewage treatment tanks need to be prepared, which further increases the treatment cost. Summary of the invention
[0003] In view of the deficiencies in the prior art, the present invention provides a sewage deep treatment device, which can automatically add alkaline or acidic agents according to the pH value of the sewage during transportation to adjust the pH value to a value suitable for flocculation, and complete stirring and add flocculants during transportation to achieve continuous reaction, thereby effectively reducing the cost of sewage treatment.
[0004] In order to solve the above technical problems, the present invention is solved through the following technical solutions: a sewage deep treatment device, including a sewage pipe, the sewage pipe outlet is connected to a filtering device or a sedimentation tank, the sewage pipe includes an inlet section, a pH adjustment section and a flocculation section in sequence along the water flow direction, the inlet section is provided with a pH detection head and a flow meter, the pH adjustment section is connected to an acid mixing pipe and an alkali mixing pipe on the side, the acid mixing pipe and the alkali mixing pipe are connected to a first electromagnetic flow valve, a stirring mechanism is provided in the pH adjustment section on the rear side of the acid mixing pipe and the alkali mixing pipe, a flocculant mixing pipe is connected to the side of the flocculation section, the flocculant mixing pipe is connected to a second electromagnetic flow valve, a stirring mechanism is provided in the flocculation section on the rear side of the flocculant mixing pipe, the pH detection head, the flow meter, the first electromagnetic flow valve and the second electromagnetic flow valve are all connected to a control device. When this sewage treatment device is treating sewage, since the pH value of the sewage entering the sewage pipe will fluctuate, the pH value of the sewage flowing into the sewage pipe is first detected in real time by a pH detection head, and the sewage flow rate is detected by a flow meter. The control device calculates the flow rate of acid or alkali solution to be added according to the pH value and flow rate of the sewage and the suitable pH value of the coagulant used, and then controls the second electromagnetic flow valve to adjust the flow rate of the acid or alkali solution according to the calculation result, so that sewage with different pH values can be finally neutralized to a pH value suitable for flocculant reaction after entering the sewage pipe during the sewage treatment process, and stirring and flocculant addition are completed during the transportation process to achieve continuous reaction, thereby effectively reducing the cost of sewage treatment.
[0005] In the above technical scheme, preferably, the stirring mechanism includes a plurality of stirring units, the stirring unit includes a bracket, a main shaft is provided on the bracket, an outer shell is rotatably provided on the main shaft, a plurality of guide blades are rotatably provided on the outer shell, a sliding block is slidably provided on the main shaft, a rack is provided on the sliding block, a gear meshing with the rack is provided at the inner end of the guide blade, a guide groove is axially provided on the outer wall of the sliding block, a first guide block extending into the guide groove is provided on the outer shell, two limit slots with axial spacing are provided at the bottom of the guide groove, an arc head positioning block is elastically provided at the bottom of the first guide block, an internal threaded ring is threadedly matched on the main shaft, a second guide block extending into the guide groove is provided on the internal threaded ring, a first spring is rotatably connected between the internal threaded ring and the sliding block, the first spring pushes or pulls the sliding block to slide so that the arc head positioning block reciprocates between the two limit slots and causes the guide blade to flip. This stirring mechanism stirs the sewage through multiple stirring units so that the sewage can fully react with the acid or alkali solution involved in the reaction and fully mix with the flocculant. When the stirring unit is working, no additional power source is required. The sewage flows in the sewage pipe to push the guide vanes to make the outer shell rotate on the main shaft. When the outer shell rotates, it drives the sliding block and the internal thread ring to rotate together. When the internal thread ring is on the side away from the outer shell, the direction of rotation will make the internal thread ring cooperate with the main shaft thread and approach the outer shell. At this time, the first spring will be compressed. When the elastic force of the first spring causes the arc head positioning block to shrink and move out of the limit slot, the sliding block moves to the side close to the outer shell until the arc head positioning block is inserted Another limiting slot, during the movement, the rack and the gear cooperate to make the guide blade flip over, after the guide blade flips over, due to the flow of sewage, the guide blade will drive the outer shell to rotate in the opposite direction, at this time the internal thread ring cooperates with the main shaft thread and moves away from the outer shell, when the pulling force of the first spring causes the arc head positioning block to shrink and move out of the limiting slot, the sliding block moves to the side away from the outer shell until the arc head positioning block is inserted into another limiting slot, during the movement, the rack and the gear cooperate to flip the guide blade again, the guide blade will drive the outer shell to reverse rotation again, and the reciprocating stirring of the guide blades on several stirring units can effectively improve the reaction efficiency without the need for an additional power source.
[0006] In the above technical solution, preferably, a positioning groove is provided at the bottom of the first guide block, a second spring is provided in the positioning groove, and the arc head positioning block is provided at the bottom of the second spring.
[0007] In the above technical solution, preferably, the outer wall of the sliding block is provided with a support portion, a bending arm is rotatably provided on the support portion, a torsion spring is provided between the bending arm and the bending arm, one end of the bending arm is against the inner wall of the sewage pipe, and the other end of the bending arm is located on the outside of the outer shell, and a protrusion is provided on the outer shell. When the sliding block slides to make the arc head positioning block reciprocate between the two limit slots, the bending arm passes over the protrusion to make the other end of the bending arm hammer the inner wall of the sewage pipe. When this structure is used, during the sliding process of the sliding block, one end of the bending arm will pass over the protrusion once, so that the other end of the bending arm hammers the inner wall of the sewage pipe. The use of this structure can make the side wall of the sewage pipe vibrate, effectively reducing the adhesion or accumulation of substances in the sewage on the inner wall of the sewage pipe, which may cause the sewage pipe to be blocked.
[0008] In the above technical solution, preferably, the raised portion is annularly arranged around the surface of the outer shell. When the stirring unit is assembled using this structure, there is no need to find the angle at which the bending arm and the raised portion are aligned to assemble the sliding block and the outer shell. When the sliding block and the outer shell are assembled at any angle, the bending arm can pass over the raised portion when the sliding block slides.
[0009] In the above technical solution, preferably, the pH adjustment section and the flocculation section are both provided with a plurality of stirring units, and the rotation directions of the plurality of guide blades on two adjacent stirring units are opposite. With this structure, the stirring directions of the guide blades of two adjacent stirring units are opposite, making the sewage agitation more chaotic and further improving the mixing effect.
[0010] In the above technical solution, preferably, the pH adjustment section is provided with a first venturi tube, the throat side of the first venturi tube is connected to a first mixing tube, the first electromagnetic flow valve is provided on the first mixing tube, the first mixing tube is connected to the acid mixing tube and the alkali mixing tube through an electromagnetic two-position three-way valve, the electromagnetic two-position three-way valve is connected to the control device, and the electromagnetic two-position three-way valve is used to switch the sewage pipe to connect to the acid mixing tube or the alkali mixing tube. The structure can provide power for mixing acid or alkali through the flow of sewage without additional power, and the control device controls the first electromagnetic flow valve and the electromagnetic two-position three-way valve to conveniently control the flow and switch the acid and alkali.
[0011] In the above technical solution, preferably, the flocculation section is provided with a second venturi tube, and the throat side of the second venturi tube is connected to the flocculant mixing tube. This structure can provide power for mixing flocculants through the flow of sewage without additional power.
[0012] Compared with the prior art, the present invention has the following beneficial effects: when the sewage treatment device is treating sewage, since the pH value of the sewage entering the sewage pipe will fluctuate, the pH value of the sewage flowing into the sewage pipe is first detected in real time by a pH detection head, and the sewage flow rate is detected by a flow meter. The control device calculates the flow rate of acid or alkali solution to be added according to the pH value and flow rate of the sewage and the suitable pH value of the coagulant used, and then controls the second electromagnetic flow valve to adjust the flow rate of the acid or alkali solution according to the calculation result, so that sewage with different pH values can be finally neutralized to a pH value suitable for flocculant reaction after entering the sewage pipe during the sewage treatment process, and stirring and flocculant addition are completed during the transportation process to achieve continuous reaction, effectively reducing the cost of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.
[0014] Figure 2 It is a schematic diagram of the structure in which the stirring unit is fixed in the sewage pipe in an embodiment of the present invention.
[0015] Figure 3 Schematic diagram of the structure of the stirring unit in the embodiment of the present invention.
[0016] Figure 4 Schematic diagram of the cross-sectional structure of the stirring unit in the embodiment of the present invention.
[0017] Figure 5 Schematic diagram of the coordination between the arc head positioning block and the limiting slot of the stirring unit in an embodiment of the present invention.
[0018] Figure 6 It is a schematic diagram of the state of the bending arm when the sliding block is away from the outer shell in the embodiment of the present invention.
[0019] Figure 7 It is a schematic diagram of the state of the bending arm when the sliding block is close to the outer shell in the embodiment of the present invention. DETAILED DESCRIPTION
[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figures 1 to 7A sewage deep treatment device comprises a sewage pipe 1, the outlet of the sewage pipe 1 is connected to a filter device or a sedimentation tank, the filter device or the sedimentation tank is used to remove flocculent particles, the sewage pipe 1 comprises an inlet section 2, a pH adjustment section 3 and a flocculation section 4 in sequence along the water flow direction, the inlet section 2 is provided with a pH detection head 5 and a flow meter 6, the side of the pH adjustment section 3 is connected to an acid mixing pipe 7 and an alkali mixing pipe 8, the acid mixing pipe 7 and the alkali mixing pipe 8 are connected to an acid storage tank and an alkali storage tank They are connected respectively, the acid mixing pipe 7 and the alkali mixing pipe 8 are connected to the first electromagnetic flow valve 9, a stirring mechanism is provided in the pH adjusting section 3 at the rear side of the acid mixing pipe 7 and the alkali mixing pipe 8, a flocculant mixing pipe 10 is connected to the side of the flocculation section 4, the flocculant mixing pipe 10 is connected to the second electromagnetic flow valve 11, a stirring mechanism is provided in the flocculation section 4 at the rear side of the flocculant mixing pipe 10, and the pH detection head 5, the flow meter 6, the first electromagnetic flow valve 9 and the second electromagnetic flow valve 11 are all connected to the control device. When this sewage treatment device is treating sewage, since the pH value of the sewage entering the sewage pipe 1 will fluctuate, the pH value of the sewage flowing into the sewage pipe 1 is first detected in real time by the pH detection head 5, and the sewage flow rate is detected by the flow meter 6. The control device calculates the flow rate of the acid or alkali solution to be added according to the pH value and flow rate of the sewage and the suitable pH value of the coagulant used, and then controls the second electromagnetic flow valve 11 to adjust the flow rate of the acid or alkali solution according to the calculation result, so that in the sewage treatment process, sewage with different pH values can be finally neutralized to a pH value suitable for the flocculant reaction after entering the sewage pipe 1, and stirring and flocculant addition are completed during the transportation process to achieve continuous reaction, thereby effectively reducing the cost of sewage treatment.
[0021] In this embodiment, the stirring mechanism includes a plurality of stirring units 12, and the stirring unit 12 includes a bracket 13, a main shaft 14 is provided on the bracket 13, an outer shell 15 is rotatably provided on the main shaft 14, four guide blades 16 are rotatably provided on the outer shell 15 in the radial direction, and four through holes are evenly provided on the outer shell 15 in the circumferential direction. The shaft of the guide blade 16 is inserted into the through hole, and the blade of the guide blade 16 located on the outer side of the outer shell 15 blocks water to generate lateral force to rotate the outer shell, and a sliding block 17 is slidably provided on the main shaft 14, and the sliding block 17 is cylindrically sleeved on the main shaft 14, and a rack 18 is fixedly provided on the sliding block 17, and a gear 19 meshing with the rack 18 is fixedly provided at the inner end of the guide blade 16, and the rack 18 can be integrated with the sliding block 17, and the gear 19 can also be directly formed at the inner end of the guide blade 16, and the sliding block 17 A guide groove 20 is axially arranged on the outer wall, a first guide block 21 extending into the guide groove 20 is arranged on the outer shell 15, two limit slots 22 with an axial spacing are opened at the bottom of the guide groove 20, an arc head positioning block 23 is elastically arranged at the bottom of the first guide block 21, an internal thread ring 24 is threadedly matched on the main shaft 14, a second guide block 25 extending into the guide groove 20 is arranged on the internal thread ring 24, a first spring 26 is rotatably connected between the internal thread ring 24 and the sliding block 17, rotating rings are rotatably arranged on the surfaces opposite to the internal thread ring 24 and the sliding block 17, the two rotating rings are fixedly connected to the two ends of the first spring 26, the first spring 26 pushes or pulls the sliding block 17 to slide so that the arc head positioning block 23 reciprocates between the two limit slots 22, and the guide vane 16 is flipped, and the flipping angle of the guide vane in this embodiment is 90 degrees.This stirring mechanism stirs the sewage through multiple stirring units 12 so that the sewage can fully react with the acid or alkali solution involved in the reaction and fully mix with the flocculant. When the stirring unit 12 is working, no additional power source is required. The sewage flows in the sewage pipe 1 to push the guide blades 16 to make the outer shell 15 rotate on the main shaft 14. When the outer shell 15 rotates, it drives the sliding block 17 and the internal threaded ring 24 to rotate together. When the internal threaded ring 24 is on the side away from the outer shell 15, the direction of rotation will make the internal threaded ring 24 and the main shaft 14 thread fit together and approach the outer shell 15. At this time, the first spring 26 will be compressed. When the elastic force of the first spring 26 causes the arc head positioning block 23 to shrink and move out of the limit slot 22, the sliding block 17 moves to the side close to the outer shell 15 until the arc head positioning block 23 is inserted into the other limit slot. The guide vane 16 is engaged with the guide slot 22, and during the movement, the rack 18 cooperates with the gear 19 to flip the guide vane 16. After the guide vane 16 flips, due to the flow of sewage, the guide vane 16 will drive the outer shell 15 to rotate in the opposite direction. At this time, the internal threaded ring 24 cooperates with the main shaft 14 thread and moves away from the outer shell 15. When the arc head positioning block 23 shrinks and moves out of the limiting slot 22 under the pulling force of the first spring 26, the sliding block 17 moves to the side away from the outer shell 15 until the arc head positioning block 23 is inserted into another limiting slot 22. During the movement, the rack 18 cooperates with the gear 19 to flip the guide vane 16 again, and the guide vane 16 will drive the outer shell 15 to reverse and rotate again. The reciprocating stirring of the guide vanes 16 on the stirring units 12 can effectively improve the reaction efficiency without the need for an additional power source.
[0022] In this embodiment, a positioning groove 27 is provided at the bottom of the first guide block 21 , a second spring 28 is provided in the positioning groove 27 , and an arc head positioning block 23 is provided at the bottom of the second spring 28 .
[0023] Since the inner wall of the sewage pipe is prone to scale or flocculent particles when sewage flows through it, the resistance of the sewage pipe is increased or even blocked. In this embodiment, a support portion 29 is provided on the outer wall of the sliding block 17, and a bending arm 30 is rotatably provided on the support portion 29. A torsion spring 31 is provided between the bending arm 30, and one end of the bending arm 30 is against the inner wall of the sewage pipe 1, and the other end of the bending arm 30 is located on the outside of the outer shell 15. A protrusion 32 is provided on the outer shell 15. When the sliding block 17 slides to make the arc head positioning block 23 reciprocate between the two limit slots 22, the bending arm 30 passes over the protrusion 32 to make the other end of the bending arm 30 hammer the inner wall of the sewage pipe 1. When the sliding block 17 slides using this structure, one end of the bending arm 30 will pass over the protrusion 32 once, so that the other end of the bending arm 30 hammers the inner wall of the sewage pipe 1. This structure can make the side wall of the sewage pipe 1 vibrate, effectively reducing the adhesion and accumulation of substances in the sewage on the inner wall of the sewage pipe 1 and causing blockage of the sewage pipe 1.
[0024] In this embodiment, the protrusion 32 is annularly arranged on the surface of the outer shell 15. When the stirring unit is assembled by adopting this structure, there is no need to find the angle at which the bending arm 30 and the protrusion 32 are aligned to assemble the sliding block 17 and the outer shell 15. When the sliding block 17 and the outer shell 15 are assembled at any angle, the bending arm 30 can pass over the protrusion 32 when the sliding block 17 slides.
[0025] In this embodiment, a plurality of stirring units 12 are provided in both the pH adjustment section 3 and the flocculation section 4, and the rotation directions of the plurality of guide blades 16 on two adjacent stirring units 12 are opposite. This structure makes the stirring directions of the guide blades 16 of two adjacent stirring units opposite, making the sewage agitation more chaotic and further improving the mixing effect.
[0026] In this embodiment, the pH adjustment section 3 is provided with a first venturi tube 33, the throat side of the first venturi tube 33 is connected with a first mixing pipe 34, the first mixing pipe 34 is provided with a first electromagnetic flow valve 9, the first mixing pipe 34 is connected to the acid mixing pipe 7 and the alkali mixing pipe 8 through an electromagnetic two-position three-way valve 35, the electromagnetic two-position three-way valve 35 is connected to the control device, and the sewage pipe 1 is switched to connect the acid mixing pipe 7 or the alkali mixing pipe 8 through the electromagnetic two-position three-way valve 35. The structure can provide power for mixing acid or alkali through the flow of sewage, without additional power, and the control device controls the first electromagnetic flow valve 9 and the electromagnetic two-position three-way valve 35 to conveniently control the flow and switch the acid and alkali.
[0027] Of course, in other embodiments, the acid solution mixing pipe 7 and the alkali solution mixing pipe 8 can be connected to the pH adjustment section 3 separately, and the flow rates can be controlled separately through a first electromagnetic flow valve 9 .
[0028] In this embodiment, a second venturi tube 36 is provided on the flocculation section 4, and a flocculant mixing pipe 10 is connected to the throat side of the second venturi tube 36. This structure can provide power for mixing flocculants through the flow of sewage without additional power.
[0029] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A sewage deep treatment device, comprising a sewage pipe (1), wherein the outlet of the sewage pipe (1) is connected to a filtering device or a sedimentation tank, characterized in that: The sewage pipe (1) comprises an inlet section (2), a pH adjustment section (3) and a flocculation section (4) in sequence along the water flow direction; the inlet section (2) is provided with a pH detection head (5) and a flow meter (6); the pH adjustment section (3) is connected to an acid mixing pipe (7) and an alkali mixing pipe (8) on the side thereof; the acid mixing pipe (7) and the alkali mixing pipe (8) are connected to a first electromagnetic flow valve (9); a stirring mechanism is provided in the pH adjustment section (3) at the rear side of the acid mixing pipe (7) and the alkali mixing pipe (8); the flocculation section (4) is connected to a flocculant mixing pipe (10) on the side thereof; the flocculant mixing pipe (10) is connected to a second electromagnetic flow valve (11); a stirring mechanism is provided in the flocculation section (4) at the rear side of the flocculant mixing pipe (10); the pH detection head (5), the flow meter (6), the first electromagnetic flow valve (9) and the second electromagnetic flow valve (11) are all connected to a control device.
2. A sewage deep treatment device as claimed in claim 1, characterized in that: The stirring mechanism comprises a plurality of stirring units (12), wherein the stirring units (12) comprise a bracket (13), wherein a main shaft (14) is provided on the bracket (13), an outer shell (15) is rotatably provided on the main shaft (14), a plurality of guide vanes (16) are rotatably provided on the outer shell (15) in the radial direction, a sliding block (17) is slidably provided on the main shaft (14), a rack (18) is provided on the sliding block (17), a gear (19) meshing with the rack (18) is provided at the inner end of the guide vane (16), a guide groove (20) is axially provided on the outer wall of the sliding block (17), and a first gear (19) extending into the guide groove (20) is provided on the outer shell (15). A guide block (21), wherein two limit slots (22) with an axial spacing are formed at the bottom of the guide groove (20), an arc head positioning block (23) is elastically provided at the bottom of the first guide block (21), an internal thread ring (24) is threadedly matched on the main shaft (14), and a second guide block (25) extending into the guide groove (20) is provided on the internal thread ring (24), and a first spring (26) is rotatably connected between the internal thread ring (24) and the sliding block (17), and the first spring (26) pushes or pulls the sliding block (17) to slide so that the arc head positioning block (23) reciprocates between the two limit slots (22) and causes the guide vane (16) to flip.
3. A sewage deep treatment device as claimed in claim 2, characterized in that: A positioning groove (27) is provided at the bottom of the first guide block (21), a second spring (28) is provided in the positioning groove (27), and the arc head positioning block (23) is provided at the bottom of the second spring (28).
4. A sewage deep treatment device as claimed in claim 2, characterized in that: The outer wall of the sliding block (17) is provided with a support portion (29), a bending arm (30) is rotatably provided on the support portion (29), a torsion spring (31) is provided between the bending arm (30), one end of the bending arm (30) is in contact with the inner wall of the sewage pipe (1), the other end of the bending arm (30) is located outside the outer shell (15), and a protrusion (32) is provided on the outer shell (15), and when the sliding block (17) slides to make the arc head positioning block (23) reciprocate between the two limit slots (22), the bending arm (30) passes over the protrusion (32) so that the other end of the bending arm (30) hammers the inner wall of the sewage pipe (1).
5. A sewage deep treatment device as claimed in claim 4, characterized in that: The raised portion (32) is arranged in an annular shape around the surface of the outer shell (15).
6. A sewage deep treatment device as claimed in claim 2, characterized in that: A plurality of stirring units (12) are provided in the pH adjustment section (3) and the flocculation section (4), and the plurality of guide blades (16) on two adjacent stirring units (12) rotate in opposite directions.
7. A sewage deep treatment device as claimed in claim 1, characterized in that: The pH adjustment section (3) is provided with a first venturi tube (33), the throat side of the first venturi tube (33) is connected to a first liquid mixing tube (34), the first electromagnetic flow valve (9) is provided on the first liquid mixing tube (34), the first liquid mixing tube (34) is connected to the acid liquid mixing tube (7) and the alkali liquid mixing tube (8) via an electromagnetic two-position three-way valve (35), the electromagnetic two-position three-way valve (35) is connected to the control device, and the electromagnetic two-position three-way valve (35) is used to switch the sewage pipe (1) to connect to the acid liquid mixing tube (7) or the alkali liquid mixing tube (8).
8. A sewage deep treatment device as claimed in claim 1, characterized in that: The flocculation section (4) is provided with a second venturi tube (36), and the throat side of the second venturi tube (36) is connected to the flocculant mixing tube (10).