Sewage treatment device and construction method thereof

Abstract

The application relates to the field of sewage treatment, in particular to a sewage treatment device and a construction method thereof, which comprises a coagulation zone, a flocculation zone and a sedimentation zone connected in sequence along the direction of sewage flow, the bottom side of the coagulation zone and the flocculation zone is communicated, the top side of the flocculation zone and the sedimentation zone is communicated, a sludge collecting cylinder is fixedly installed at the bottom side of the sedimentation zone, the sludge collecting cylinder is communicated with the sedimentation zone, a sludge discharging pipe is installed on the sludge collecting cylinder, a sludge suction pump is installed on the sludge discharging pipe, a sludge scraping machine is installed on the sedimentation zone and used for scraping the sludge at the bottom of the sedimentation zone to the sludge collecting cylinder, an overflow mechanism is installed at the top side of the sedimentation zone and used for discharging water in the sedimentation zone, a pumping mechanism is installed on the side of the sedimentation zone far from the flocculation zone and used for pumping the water in the sedimentation zone into the flocculation zone. The application has the effect of reducing the damage of the scraping plate of the sludge scraping machine.

Description

TECHNICAL FIELD

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

[0002] In order to make sewage meet the requirements of discharge or reuse, the sewage generally needs to be transported to a sewage treatment plant for treatment. The sewage treatment device is a device for treating sewage in the sewage treatment plant. The common sewage treatment device in the sewage treatment plant is a high-efficiency sedimentation tank.

[0003] At present, the related technology discloses a high-efficiency sedimentation tank, which includes a coagulation zone, a flocculation zone and a sedimentation zone which are sequentially communicated along the direction of sewage flow. A sludge collecting cylinder is fixedly installed at the bottom side of the sedimentation zone, and the sludge collecting cylinder is communicated with the sedimentation zone. The sludge collecting cylinder is provided with a sludge discharge pipe, and the sludge discharge pipe is provided with a sludge suction pump. The sedimentation zone is provided with a sludge scraper for scraping the sludge at the bottom of the sedimentation zone to the sludge collecting cylinder. The top side of the sedimentation zone is provided with an overflow mechanism for discharging water inside the sedimentation zone. The coagulant and the sewage are added to the coagulation zone for coagulation to form alum flowers. The alum flowers enter the flocculation zone from the coagulation zone, and after adding a flocculating agent to the flocculation zone, the alum flowers are flocculated, so that the volume of the alum flowers is increased and then discharged into the sedimentation zone. The alum flowers are deposited in the sedimentation zone, and the clear water is discharged from the overflow mechanism. The alum flowers at the bottom side of the sedimentation zone are scraped by the sludge scraper and enter the inside of the sludge collecting cylinder. Then the alum flowers in the inside of the sludge collecting cylinder are discharged through the sludge suction pump and the sludge discharge pipe for recycling.

[0004] In view of the related technology in the above, the inventor believes that after the alum flowers enter the sedimentation zone from the flocculation zone, the alum flowers will gather on one side of the sedimentation zone close to the flocculation zone. When the sludge scraper scrapes the alum flowers gathered on the one side of the sedimentation zone close to the flocculation zone, the resistance received by the scraper plate of the sludge scraper is large, so that the scraper plate of the sludge scraper is easily damaged. SUMMARY

[0005] In order to reduce the damage of the scraper plate of the sludge scraper, the present application provides a sewage treatment device and a construction method thereof.

[0006] The sewage treatment device and the construction method thereof provided by the present application adopt the following technical scheme:

[0007] The sewage treatment device comprises a coagulation zone, a flocculation zone and a sedimentation zone which are sequentially connected along the direction of sewage flow, the coagulation zone and the flocculation zone are communicated at the bottom side, the flocculation zone and the sedimentation zone are communicated at the top side, a sludge collecting cylinder is fixedly installed at the bottom side of the sedimentation zone and communicated with the sedimentation zone, a sludge discharging pipe is installed on the sludge collecting cylinder, a sludge pumping pump is installed on the sludge discharging pipe, a sludge scraping machine is installed on the sedimentation zone and used for scraping the sludge at the bottom of the sedimentation zone to the sludge collecting cylinder, an overflow mechanism is installed at the top side of the sedimentation zone and used for discharging the water in the sedimentation zone, and a pumping mechanism is installed on the side of the sedimentation zone away from the flocculation zone and used for pumping the water in the sedimentation zone into the flocculation zone.

[0008] By adopting the technical scheme, the sewage and the coagulant are fed into the coagulation zone, the coagulant adsorbs the impurities in the sewage to form alum flowers. The alum flowers enter the flocculation zone, and the flocculation agent is added to the flocculation zone, so that the alum flowers are gathered to increase the volume of the alum flowers. Then the alum flowers enter the sedimentation zone from the flocculation zone. When the alum flowers enter the sedimentation zone, the pumping mechanism is started, and the pumping mechanism pumps the water in the sedimentation zone to the flocculation zone. The water flow in the sedimentation zone is driven by the pumping mechanism to move from one side close to the flocculation zone to the other side. The alum flowers in the sedimentation zone are driven by the water flow in the sedimentation zone to move from one side close to the flocculation zone to the other side, so that the alum flowers are not gathered on one side close to the flocculation zone in the sedimentation zone, and the damage of the scraping plate of the sludge scraping machine is reduced.

[0009] Optionally, the pumping mechanism comprises a pumping pump, a tapping pipe, a plurality of water inlet pipes and a water outlet pipe. The tapping pipe and the water inlet pipes are both provided with a plurality of pipes. The tapping pipes are arranged in a staggered manner in the horizontal and vertical directions. The water inlet pipes are fixedly installed on the side of the sedimentation zone away from the flocculation zone. The water inlet pipes are embedded on the side of the sedimentation zone away from the flocculation zone. One end of the water inlet pipe is connected with the tapping pipe. The other end of the water inlet pipe is communicated with the sedimentation zone. The water inlet end of the pumping pump is connected with the tapping pipe. The water outlet end of the pumping pump is connected with one end of the water outlet pipe. The other end of the water outlet pipe is communicated with the flocculation zone.

[0010] By adopting the technical scheme, the pumping pump is started, and the pumping pump pumps the water in the sedimentation zone into the water outlet pipe through the tapping pipe and the water inlet pipe. Then the water is discharged from the water outlet pipe into the flocculation zone, so that the water in the sedimentation zone is conveniently pumped into the flocculation zone.

[0011] Optionally, the water inlet pipes are spaced apart in multiple rows from top to bottom. In each row of the water inlet pipes, the water inlet pipes are arranged in a spaced apart manner in the horizontal direction. The length of each row of the water inlet pipes gradually decreases from top to bottom.

[0012] By adopting the technical scheme, the pumping mechanism pumps water in the sedimentation area, and the alum flowers in the sedimentation area are pushed by the water flow to move away from the flocculation area. The alum flowers with large volume have a fast sedimentation speed in the sedimentation area and a slow speed of moving away from the flocculation area under the water flow, while the alum flowers with small volume have a slow sedimentation speed in the sedimentation area and a fast speed of moving away from the flocculation area under the water flow. The length of the inlet pipe gradually decreases from top to bottom, so that the inlet pipe can pump the alum flowers with small volume, and then the alum flowers with small volume are sent into the flocculation area through the branch pipe, the pumping pump and the outlet pipe. The alum flowers with small volume are flocculated again in the flocculation area, so that the alum flowers with small volume and slow sedimentation speed appear.

[0013] Optionally, the inlet pipe is gradually lowered and arranged in an inclined manner from one end away from the branch pipe to the other end.

[0014] By adopting the technical scheme, the inlet pipe is arranged in an inclined manner, so that the inlet pipe pumps water away from the bottom side of the sedimentation area, thereby reducing the disturbance of the alum flowers on the bottom side of the sedimentation area by the inlet pipe. At the same time, when part of the alum flowers with small volume are discharged upward from the overflow mechanism, the inlet pipe pumps water, thereby reducing the situation that the alum flowers enter the overflow mechanism, and further improving the quality of the treated sewage.

[0015] Optionally, a support plate is fixedly installed inside the flocculation area, the support plate is provided with a mounting opening, first flow guide cylinders are fixedly installed between the inner walls of the mounting opening, a flocculation agitator for stirring inside the first flow guide cylinders is installed in the flocculation area, the impeller of the flocculation agitator is further used to push the water flow from top to bottom, second flow guide cylinders are fixedly installed at the top end of the first flow guide cylinders, the diameters of the second flow guide cylinders gradually decrease from top to bottom, a flocculant feeding pipe is installed in the flocculation area, a flocculant dosing ring is communicated at one end of the feeding pipe, the flocculant dosing ring is fixedly sleeved on the first flow guide cylinder, and the flocculant dosing ring is in communication with the inside of the first flow guide cylinder.

[0016] By adopting the technical scheme, the flocculant enters the first flow guide cylinder in sequence through the flocculant feeding pipe and the flocculant dosing ring. The flocculation agitator forms a vortex in the first flow guide cylinder, so that the sewage inside the flocculation area enters the first flow guide cylinder from the second flow guide cylinder. Then the flocculant and the sewage are mixed in the first flow guide cylinder. The flocculation agitator pushes the water flow from top to bottom, and the water flow impacts the bottom side of the flocculation area, thereby disturbing the alum flowers on the bottom side of the flocculation area, and further reducing the situation that the alum flowers accumulate in the flocculation area.

[0017] Optionally, support rods are arranged inside the first flow guide cylinder, a plurality of flow guide plates are fixedly installed on the rod bodies of the support rods in a circumferential direction, and the sides of the flow guide plates away from the support rods are fixedly connected with the inner walls of the first flow guide cylinder.

[0018] By adopting the technical scheme, when the flocculation agitator drives the sewage and the flocculant to form a vortex, the vortex impacts the guide plate, and the guide plate can disrupt the vortex, thereby facilitating the full reaction of the sewage and the flocculant.

[0019] Optionally, the flocculant adding ring is located above the impeller of the flocculation agitator, and the guide plate is located below the impeller of the flocculation agitator.

[0020] By adopting the technical scheme, after the flocculant enters the first guide cylinder, it is affected by the vortex inside the first guide cylinder and moves downward to impact the guide plate, thereby facilitating the full reaction of the sewage and the flocculant.

[0021] Optionally, the first guide cylinder is fixedly sleeved with a recovery adding ring, the recovery adding ring is in communication with the inside of the first guide cylinder, and the recovery adding ring is used for receiving water sent into the flocculation zone by the pumping mechanism.

[0022] By adopting the technical scheme, the recovery adding ring sprays the water sent into the flocculation zone by the pumping mechanism toward the inside of the first guide cylinder, and the water sprayed by the recovery adding ring disrupts the vortex inside the first guide cylinder, thereby facilitating the full reaction of the sewage and the flocculant.

[0023] Optionally, the overflow mechanism includes an inclined plate filler, an overflow tank body and a water collecting tank body, the overflow tank body and the inclined plate filler are fixedly installed on the top side of the precipitation zone, the overflow tank body is located above the inclined plate filler, both side walls of the overflow tank body are provided with overflow ports, the water collecting tank body is fixedly installed on the circumferential wall of the precipitation zone, and both ends of the overflow tank body are in communication with the water collecting tank body.

[0024] By adopting the technical scheme, the alum flowers in the precipitation zone are precipitated, the clear water flows through the inclined plate filler, and then enters the inside of the overflow tank body from the overflow ports. Then the water enters the inside of the water collecting tank body from the overflow tank body, and the clear water is discharged through the water collecting tank body. The inclined plate filler is conducive to reducing the situation that the alum flowers rise and enter the overflow tank body, thereby improving the quality of the treated sewage.

[0025] A construction method of a sewage treatment device includes the following installation steps:

[0026] Excavate a foundation pit, pre-bury support pipes, compact the foundation pit, and pour a base in the foundation pit;

[0027] Support a formwork on the base, and the formwork encloses a space for pouring the coagulation zone, the flocculation zone and the precipitation zone;

[0028] Pour concrete into the space enclosed by the support formwork, and after the concrete solidifies, remove the formwork to form the coagulation zone, the flocculation zone and the precipitation zone

[0029] Install a pumping mechanism, a mud scraper and an overflow mechanism in the precipitation zone.

[0030] By adopting the above technical scheme, the support pipe and the base support the coagulation zone, the flocculation zone and the sedimentation zone. Thus, the settling of the coagulation zone, the flocculation zone and the sedimentation zone is reduced.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The pumping mechanism pumps water from the sedimentation zone back to the flocculation zone, thereby driving the water flow in the sedimentation zone to move from one side of the sedimentation zone close to the flocculation zone to the other side. The movement of the water flow pushes the alum flowers in the sedimentation zone to move away from the flocculation zone, thereby reducing the settling of the alum flowers on the side of the sedimentation zone close to the flocculation zone, and further reducing the damage to the scraper blades of the mud scraper.

[0033] 2. The volume of alum flowers that have reacted sufficiently in the flocculation zone is large, and the settling speed is fast. The volume of alum flowers that have not reacted sufficiently in the flocculation zone is small, and the settling speed is slow. Thus, the pumping mechanism can easily pump the small volume of alum flowers back to the flocculation zone for re-flocculation, thereby reducing the situation where the small volume of alum flowers is discharged from the overflow mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure of the first perspective of the embodiment of the present application;

[0035] Figure 2 is a schematic diagram of the overall structure of the second perspective of the embodiment of the present application;

[0036] Figure 3 is Figure 2 a sectional view at A-A;

[0037] Figure 4 is Figure 3 an enlarged view at A;

[0038] Figure 5 is Figure 3 an enlarged view at B;

[0039] Figure 6 is Figure 3 an enlarged view at C.

[0040] Explanation of reference signs: 1, coagulation zone; 2, flocculation zone; 3, sedimentation zone; 4, coagulant feeding pipe; 5, sewage feeding pipe; 6, stirrer; 7, support plate; 8, mounting port; 9, first flow guide cylinder; 10, second flow guide cylinder; 11, flocculation stirrer; 12, flocculant feeding pipe; 13, flocculant feeding ring; 14, support rod; 15, flow guide plate; 16, sludge collecting cylinder; 17, sludge scraper; 18, sludge discharge pipe; 19, sludge suction pump; 20, overflow mechanism; 201, inclined plate filler; 202, overflow tank body; 203, water collecting tank body; 21, overflow port; 22, pumping mechanism; 221, pumping pump; 222, tapping pipe; 223, water inlet pipe; 224, water outlet pipe; 23, recovery feeding ring. DETAILED DESCRIPTION

[0041] The following will be described in detail with reference to the accompanying drawings. Figures 1-6 The present application is further described in detail.

[0042] The present application discloses a sewage treatment device and a construction method thereof.

[0043] Reference will be made to Figure 1 , Figure 2 A sewage treatment device comprises a coagulation zone 1, a flocculation zone 2 and a sedimentation zone 3 connected in sequence along the direction of sewage flow. The coagulation zone 1 is provided with a coagulant feeding pipe 4 on one side, and a sewage feeding pipe 5 is fixedly installed on the side of the coagulation zone 1 away from the flocculation zone 2. The sewage enters the coagulation zone 1 from the sewage feeding pipe 5, and the coagulant enters the coagulation zone 1 from the coagulant feeding pipe 4. The coagulation zone 1 is provided with a stirrer 6, and the stirrer 6 is started to stir the sewage in the coagulation zone 1, thereby facilitating the coagulation of the coagulant and the sewage. The bottom sides of the coagulation zone 1 and the flocculation zone 2 are communicated, and the coagulant adsorbs impurities in the sewage to form alum flowers, which then enter the flocculation zone 2.

[0044] Reference will be made to Figure 3 , Figure 4 The flocculation zone 2 is fixedly provided with a support plate 7 inside, one side of the support plate 7 faces the coagulation zone 1, and the other side of the support plate 7 faces the sedimentation zone 3. The support plate 7 is provided with a mounting port 8 in the middle, and first flow guide cylinders 9 are fixedly installed between the opposite side walls of the mounting port 8. The top side of the first flow guide cylinder 9 is fixedly provided with a second flow guide cylinder 10.

[0045] Reference will be made to Figure 2 , Figure 4, the flocculation zone 2 is provided with a flocculation agitator 11 and a flocculant feeding pipe 12, and the impeller of the flocculation agitator 11 is located inside the first draft tube 9. The impeller of the flocculation agitator 11 is also used to push the water flow from top to bottom. One end of the flocculant feeding pipe 12 is used for flocculant feeding, and the other end of the flocculant feeding pipe 12 is fixedly provided with a flocculant feeding ring 13. The flocculant feeding ring 13 is fixedly sleeved on the first draft tube 9, and the flocculant feeding ring 13 is in communication with the inside of the first draft tube 9. The flocculant feeding ring 13 is located above the impeller of the flocculation agitator 11.

[0046] Start the flocculation agitator 11, and the flocculation agitator 11 pushes the water flow inside the first draft tube 9 from top to bottom to form a vortex, so that the alum flowers enter the first draft tube 9 from the second draft tube 10, and then are discharged from the bottom end of the first draft tube 9. The diameter of the second draft tube 10 gradually decreases from top to bottom, so as to facilitate the alum flowers to enter the second draft tube 10.

[0047] The flocculant is added to the flocculant feeding pipe 12, and the flocculant enters the inside of the first draft tube 9 from the flocculant feeding pipe 12 and the flocculant feeding ring 13. The flocculant reacts with the alum flowers in the inside of the first draft tube 9, thereby increasing the volume of the alum flowers. At the same time, after the flocculant feeding ring 13 sprays the flocculant, the flocculant has the effect of disrupting the vortex in the inside of the first draft tube 9, thereby facilitating the alum flowers to fully contact with the flocculant for flocculation.

[0048] Referring to Figure 4 , the inside of the first draft tube 9 is provided with a support rod 14, and the rod body of the support rod 14 is fixedly provided with a plurality of guide plates 15 in the circumferential direction, and in the present application, there are four guide plates 15. The side of the guide plate 15 away from the support rod 14 is fixedly connected with the inner wall of the first draft tube 9. The guide plate 15 is located below the impeller of the flocculation agitator 11. The flocculation agitator 11 agitates the sewage and the flocculant in the inside of the first draft tube 9 to form a vortex. The vortex hits the guide plate 15, thereby disrupting the vortex. By disrupting the vortex, it is convenient for the flocculant to fully contact with the alum flowers for flocculation, thereby improving the speed of alum flower flocculation.

[0049] Referring to Figure 3 , the top side between the flocculation zone 2 and the precipitation zone 3 is communicated. When the flocculation agitator 11 pushes the water flow from top to bottom, it will impact the alum flowers precipitated in the flocculation zone 2, thereby reducing the situation that the alum flowers are precipitated in the flocculation zone 2, and in addition, part of the alum flowers enter the precipitation zone 3 from the flocculation zone 2. The alum flowers in the inside of the flocculation zone 2 continuously enter and exit the first draft tube 9, thereby facilitating the alum flowers to fully contact with the flocculant for flocculation.

[0050] Referring to Figure 1 , Figure 3The bottom side of the sedimentation area 3 is fixedly installed with a sludge collecting cylinder 16, and the inner bottom wall of the sedimentation area 3 is inclinedly arranged with the lowest position being the position of the sludge collecting cylinder 16, so as to facilitate the alum flowers in the sedimentation area 3 to enter the inside of the sludge collecting cylinder 16. The sedimentation area 3 is installed with a sludge scraping machine 17, and the sludge scraping machine 17 slowly rotates, so as to scrape the alum flowers in the sedimentation area 3 into the inside of the sludge collecting cylinder 16. The sludge collecting cylinder 16 is installed with a sludge discharging pipe 18, and the sludge discharging pipe 18 is installed with a sludge suction pump 19. When the sludge suction pump 19 is started, the alum flowers in the inside of the sludge collecting cylinder 16 enter the sludge discharging pipe 18 and are discharged.

[0051] Referring to Figure 3 The top side of the sedimentation area 3 is provided with an overflow mechanism 20. The overflow mechanism 20 comprises an inclined plate filler 201, an overflow groove body 202 and a water collecting groove body 203. The inclined plate filler 201 is fixedly installed on the top side of the sedimentation area 3, and the inclined plate filler 201 is spaced from the inner wall of the side of the sedimentation area 3 close to the flocculation area 2 to allow the alum flowers to enter the sedimentation area 3 from the flocculation area 2. The side of the inclined plate filler 201 close to the flocculation area 2 is inclinedly arranged, so as to facilitate buffering the alum flowers and water entering the sedimentation area 3. The shaft rod of the sludge scraping machine 17 penetrates through the inclined plate filler 201. The alum flowers in the sedimentation area 3 are downwardly precipitated, and the clarified water flows upwardly through the inclined plate filler 201. The inclined plate filler 201 has the function of blocking the upward flow of the alum flowers, so as to improve the quality of the treated sewage.

[0052] Referring to Figure 3 , Figure 5 The overflow groove body 202 has a plurality of overflow ports 21. The overflow groove body 202 is fixedly installed between the two side walls on the top side of the sedimentation area 3. The clarified water enters the inside of the overflow groove body 202 from the overflow ports 21 after passing through the inclined plate filler 201.

[0053] The water collecting groove body 203 is installed along the outer wall of the side of the sedimentation area 3 away from the flocculation area 2 and the two outer walls of the sedimentation area 3 adjacent to the flocculation area 2. The two ends of the overflow groove body 202 penetrate through the side walls of the sedimentation area 3 and are communicated with the water collecting groove body 203. The clarified water enters the water collecting groove body 203 from the overflow groove body 202 for recycling.

[0054] Referring to Figure 1 , Figure 6 The side of the sedimentation area 3 away from the flocculation area 2 is provided with a pumping mechanism 22, and the pumping mechanism 22 comprises a pumping pump 221, a tapping pipe 222, a water inlet pipe 223 and a water outlet pipe 224. The tapping pipe 222 and the water inlet pipe 223 each have a plurality of pipes. The tapping pipes 222 are fixedly installed on the outer wall of the side of the sedimentation area 3 away from the flocculation area 2 after being horizontally and vertically staggered and connected with each other. One end of the water inlet pipe 223 is communicated with the tapping pipe 222, and the other end of the water inlet pipe 223 penetrates through the side wall of the sedimentation area 3 and is communicated with the sedimentation area 3. The other end of the water inlet pipe 223 is located between the scraping plate of the sludge scraping machine 17 and the inclined plate filler 201.

[0055] Referring to Figure 4 , Figure 6 The water inlet end of the pumping pump 221 is communicated with a branch pipe 222, and the water outlet end of the pumping pump 221 is connected with one end of a water outlet pipe 224. The other end of the water outlet pipe 224 is fixedly installed with a recovery dosing ring 23. The recovery dosing ring 23 is fixedly sleeved on the first flow guide cylinder 9, and the recovery dosing ring 23 is located between the coagulant dosing ring and the impeller of the coagulation stirrer.

[0056] When the alum flowers enter the precipitation zone 3 from the flocculation zone 2, the pumping pump 221 is started, and the water inside the precipitation zone 3 enters the water inlet pipe 223, so as to drive the water flow of the precipitation zone 3 to move away from the flocculation zone 2. The water flow pushes the alum flowers to move away from the flocculation zone 2, so as to reduce the accumulation of the alum flowers on the side of the precipitation zone 3 close to the flocculation zone 2, and further reduce the damage of the scraper blade of the mud scraper 17.

[0057] The volume of the alum flowers is large, and the precipitation speed is fast; the volume of the alum flowers is small, and the precipitation speed is slow. When the alum flowers enter the precipitation zone 3 and are pushed by the water flow to flow to the water inlet pipe 223, the alum flowers with large volume precipitate in the precipitation zone 3, and the alum flowers with small volume enter the inside of the water inlet pipe 223 together with the water flow. Then the water and the alum flowers are sprayed into the inside of the first flow guide cylinder 9 after passing through the branch pipe 222, the pumping pump 221, the water outlet pipe 224 and the recovery dosing ring 23 in turn.

[0058] The water and the alum flowers sprayed by the recovery dosing ring 23 are beneficial to destroy the vortex inside the first flow guide cylinder 9, so as to facilitate the alum flowers inside the first flow guide cylinder 9 to fully contact and flocculate with the flocculant. At the same time, the alum flowers with small volume may not be fully reacted in the flocculation zone 2 and enter the precipitation zone 3, and are pumped back to the flocculation zone 2 by the pumping mechanism 22, so as to facilitate the alum flowers to flocculate with the flocculant again, and further facilitate the alum flowers to fully contact and flocculate with the flocculant.

[0059] The gap is left between the scraper blade of the mud scraper 17 and the inner bottom wall of the precipitation zone 3, so as to reduce the friction between the scraper blade of the mud scraper 17 and the inner bottom wall of the precipitation zone 3 and the damage, and further reduce the large force received by the scraper blade of the mud scraper 17 and the damage. The alum flowers with small volume are pumped back to the flocculation zone 2 to flocculate again to increase the volume, so as to facilitate the alum flowers to be scraped into the mud collecting cylinder 16 by the scraper blade of the mud scraper 17.

[0060] The water inlet pipe 223 is spaced apart and distributed by multiple rows from top to bottom, and the water inlet pipe 223 is spaced apart and arranged along the horizontal direction in each row of the water inlet pipe 223. The length of each row of the water inlet pipe 223 gradually decreases from top to bottom. The water inlet pipe 223 is gradually lowered and arranged in an inclined manner from one end away from the branch pipe 222 to the other end.

[0061] The alum flowers are pushed by the water flow and move to the water inlet pipe 223 and sink downward. The length of each row of the water inlet pipe 223 gradually decreases from top to bottom, so that the water flow has enough force to push the alum flowers, and the large volume alum flowers sink downward, thereby reducing the situation that the large volume alum flowers enter the water inlet pipe 223.

[0062] The water inlet pipe 223 is inclined upward to pump water, thereby reducing the disturbance of the water pumped by the water inlet pipe 223 to the alum flowers deposited in the sedimentation area 3. In addition, part of the small volume alum flowers move to the inclined plate filler 201, and the water inlet pipe 223 is inclined upward to pump water, thereby reducing the situation that the small volume alum flowers move to the inclined plate filler 201.

[0063] Referring to Figure 1 A construction method of a sewage treatment device, for installing the sewage treatment device of the present application, comprising the following steps:

[0064] Step S1, excavate the foundation pit and pre-bury the support pipe, compact the foundation pit, and pour the base inside the foundation pit.

[0065] Step S2, support the formwork on the base, and the formwork encloses the space for pouring the coagulation area 1, the flocculation area 2 and the sedimentation area 3. At the same time, holes for installing the sewage inlet pipe 5 and the water inlet pipe 223 are reserved on the formwork.

[0066] Step S3, pour concrete into the space enclosed by the supported formwork, and after the concrete solidifies, remove the formwork to form the coagulation area 1, the flocculation area 2 and the sedimentation area 3.

[0067] Step S4, install the pumping mechanism 22, the mud scraper 17 and the overflow mechanism 20 in the sedimentation area 3.

[0068] The implementation principle of the sewage treatment device and the construction method thereof is that the pumping mechanism 22 pumps the water in the sedimentation area 3 back to the flocculation area 2, thereby driving the water inside the sedimentation area 3 to move away from the flocculation area 2. When the alum flowers enter the sedimentation area 3, the water flow pushes the alum flowers to move away from the flocculation area 2, thereby reducing the situation that the alum flowers gather on the side of the sedimentation area 3 close to the flocculation area 2, and further reducing the situation that the scraper blade of the mud scraper 17 is damaged.

[0069] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A wastewater treatment device, characterized in that: The system includes a coagulation zone (1), a flocculation zone (2), and a sedimentation zone (3) connected sequentially along the direction of sewage flow. The coagulation zone (1) and the flocculation zone (2) are connected at their bottom sides, and the flocculation zone (2) and the sedimentation zone (3) are connected at their top sides. A sludge collection cylinder (16) is fixedly installed at the bottom side of the sedimentation zone (3). The sludge collection cylinder (16) is connected to the sedimentation zone (3). A sludge discharge pipe (18) is installed on the sludge collection cylinder (16), and a sludge suction pump is installed on the sludge discharge pipe (18). 19), the sedimentation zone (3) is equipped with a scraper (17) for scraping the sludge at the bottom of the sedimentation zone (3) toward the sludge collection cylinder (16), the top side of the sedimentation zone (3) is equipped with an overflow mechanism (20) for discharging water inside the sedimentation zone (3), and a pumping mechanism (22) is installed on the side of the sedimentation zone (3) away from the flocculation zone (2) for pumping water inside the sedimentation zone (3) into the flocculation zone (2). The pumping mechanism (22) includes a pumping pump (221), a branch pipe (222), an inlet pipe (223), and an outlet pipe (224). There are multiple branch pipes (222) and inlet pipes (223). The branch pipes (222) are arranged in a crisscross pattern. The inlet pipe (223) is fixedly installed on the side of the sedimentation zone (3) away from the flocculation zone (2). The inlet pipe (223) is embedded on the side of the sedimentation zone (3) away from the flocculation zone (2). One end of the inlet pipe (223) is connected to the branch pipe (222), and the other end of the inlet pipe (223) is connected to the sedimentation zone (3). The inlet end of the pumping pump (221) is connected to the branch pipe (222). The outlet end of the pumping pump (221) is connected to one end of the outlet pipe (224), and the other end of the outlet pipe (224) is connected to the flocculation zone (2). The water inlet pipes (223) are arranged in multiple rows at intervals from top to bottom. In each row of water inlet pipes (223), the water inlet pipes (223) are arranged at intervals in the horizontal direction, and the length of each row of water inlet pipes (223) gradually decreases from top to bottom. The inlet pipe (223) is inclined and gradually decreases from one end away from the branch pipe (222) to the other end.

2. The wastewater treatment device according to claim 1, characterized in that: A support plate (7) is fixedly installed inside the flocculation zone (2). The support plate (7) has an installation port (8). A first guide tube (9) is fixedly installed between the inner walls of the installation port (8). A flocculation agitator (11) for stirring inside the first guide tube (9) is installed in the flocculation zone (2). The impeller of the flocculation agitator (11) is also used to push water flow from top to bottom. A second guide tube (10) is fixedly installed at the top of the first guide tube (9). The diameter of the second guide tube (10) gradually decreases from top to bottom. A flocculant feed pipe (12) is installed in the flocculation zone (2). One end of the feed pipe is connected to a flocculant dosing ring (13). The flocculant dosing ring (13) is fixedly sleeved on the first guide tube (9). The flocculant dosing ring (13) is connected to the inside of the first guide tube (9).

3. The wastewater treatment device according to claim 2, characterized in that: The first guide tube (9) is provided with a support rod (14), and multiple guide plates (15) are fixedly installed on the body of the support rod (14) along the circumference. The side of the guide plate (15) away from the support rod (14) is fixedly connected to the inner wall of the first guide tube (9).

4. A wastewater treatment device according to claim 3, characterized in that: The flocculant dosing ring (13) is located above the impeller of the flocculation agitator (11), and the guide plate (15) is located below the impeller of the flocculation agitator (11).

5. A wastewater treatment device according to claim 2, characterized in that: The first guide tube (9) is fixedly fitted with a recovery and addition ring (23), which is connected to the interior of the first guide tube (9). The recovery and addition ring (23) is used to receive water sent into the flocculation zone (2) by the pumping mechanism (22).

6. A wastewater treatment device according to claim 1, characterized in that: The overflow mechanism (20) includes inclined plate packing (201), overflow trough (202) and water collection trough (203). The overflow trough (202) and inclined plate packing (201) are both fixedly installed on the top side of the sedimentation zone (3). The overflow trough (202) is located above the inclined plate packing (201). Both sides of the overflow trough (202) are provided with overflow ports (21). The water collection trough (203) is fixedly installed on the periphery of the sedimentation zone (3). Both ends of the overflow trough (202) are connected to the water collection trough (203).

7. A construction method for a wastewater treatment device, used for installing a wastewater treatment device as described in any one of claims 1-6, characterized in that, The installation process includes the following steps: excavating the foundation pit and pre-embedding the support pipe, compacting the foundation pit, and pouring a base inside the foundation pit; supporting the formwork on the base, with the formwork enclosing the space for pouring the concrete zone (1), flocculation zone (2) and sedimentation zone (3); pouring concrete into the space enclosed by the support formwork, and removing the formwork after the concrete has solidified to form the concrete zone (1), flocculation zone (2) and sedimentation zone (3); and installing the pumping mechanism (22), sludge scraper (17) and overflow mechanism (20) in the sedimentation zone (3).

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