One-stop green recycling treatment equipment for wastewater purification and sludge dewatering in foundation pit car wash pools

Abstract

This invention relates to the technical field of foundation pits, and discloses a one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in foundation pit car wash pools. The equipment includes multiple sedimentation tanks; the purification structure includes a reaction tank, a distribution tank, a flocculation tank, and an overflow tank, with an overflow weir between the flocculation tank and the overflow tank; a stirrer is installed in the reaction tank; purified water in the overflow tank is discharged into a storage tank via a pipe; the filter press includes multiple filter plates arranged side-by-side and moving apart or towards each other, with filter cloth covering both sides of each filter plate. Two filter cloths on the filter plates surround the filter plates to form a filtration zone. When adjacent filter plates are in a state of mutual pressure, they enclose a dewatering zone located between two filtration zones. When adjacent filter plates are in a state of mutual pressure, sludge mixed with high-pressure gas from the flocculation tank is discharged into the dewatering zone through a feed pipe. The water in the sludge passes through the filter cloth to form filtered water, which is then discharged into a storage tank via a pipe.

Description

Technical Field

[0001] This invention patent relates to the technical field of foundation pits, specifically to a one-stop green recycling treatment equipment for wastewater purification and sludge depressurization in foundation pit car wash pools. Background Technology

[0002] The Guimiao New Village Urban Renewal Project General Contracting Project is located at the intersection of Baishi Road and Xuefu Road, Yuehai Subdistrict, Nanshan District, Shenzhen, covering an area of ​​41,660.1 square meters. 2 The foundation pit has a perimeter of 991m and an excavation area of ​​40499m². 2 The excavation depth of the foundation pit ranged from 12.00 to 17.80 meters, with a total earthwork excavation volume of 603,435 cubic meters. 3 During the excavation of the foundation pit, a large amount of waste soil was transported off-site by dump trucks, at a rate of 10m³ per truck. 3 Based on the carrying capacity calculation, 60,344 dump truck trips are needed to complete the excavation of the foundation pit. To ensure the environmental cleanliness of the roads where the dump trucks travel, the truck bodies must be washed before leaving the construction site.

[0003] In existing technology, washing facilities are installed at the construction site entrance and exit. Vehicles are initially washed using a car wash pool, and then manually rinsed until they meet road safety standards. The daily water consumption for car washing and road rinsing is approximately 300 cubic meters. 3 It consumes a large amount of clean water resources; and when pile foundation construction and large-scale excavation of foundation pits are carried out, traditional drainage systems often cannot meet the on-site sewage discharge requirements, and the three-stage sedimentation tank cannot achieve good treatment effect, so that the untreated sludge and wastewater are discharged into the municipal pipe network, causing pollution or even blockage of municipal pipes. Summary of the Invention

[0004] The purpose of this invention is to provide a one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in car wash pits. It aims to solve the problems in the existing technology where a large amount of polluted wastewater from car washing and road washing cannot be effectively treated, causing pollution or even blockage of municipal pipelines, and the wastewater cannot be effectively utilized, resulting in high water consumption and high costs for car washing.

[0005] This invention is implemented as follows: a one-stop green recycling treatment equipment for the purification and sludge dewatering of car wash wastewater in a foundation pit includes a sedimentation structure for flowing and settling car wash wastewater to form precipitated wastewater, a purification structure, a filter press, and a water storage tank; the sedimentation structure has multiple sedimentation tanks arranged in sequence side by side, and the tops of adjacent sedimentation tanks are interconnected; the car wash wastewater flows and settles sequentially along the multiple sedimentation tanks, forming particulate precipitates settled at the bottom of the sedimentation tanks and precipitated wastewater discharged from the sedimentation tanks;

[0006] The purification structure includes a reaction tank, a water distribution tank, a flocculation tank, and an overflow tank. The reaction tank, water distribution tank, flocculation tank, and overflow tank are connected in sequence and arranged side by side. An overflow weir is provided between the flocculation tank and the overflow tank. A stirrer is provided in the reaction tank. The sedimentation wastewater and the flocculation solution are placed in the reaction tank at the same time and stirred by the stirrer to form a flowing reaction wastewater.

[0007] The reaction wastewater is discharged into a distribution tank for buffering, forming sludge that settles in the lower part of the distribution tank and is composed of suspended solids, colloids, and flocculated flocs, as well as purified water that forms in the upper part of the distribution tank; the sludge and purified water are discharged into a flocculation tank, the sludge settles in the lower part of the flocculation tank, the purified water is located in the upper part of the flocculation tank, the purified water overflows into an overflow tank through an overflow weir, and the purified water in the overflow tank is discharged into a storage tank through a pipe;

[0008] The filter press includes multiple filter plates arranged side by side and moving apart from or towards each other. Each filter plate is covered with a filter cloth on both sides. The two filter cloths on the filter plate and the filter plate surround each other to form a water filtration zone. When the adjacent filter plates are in a state of mutual pressure, the adjacent filter plates surround each other to form a filtration pressing zone. The filtration pressing zone is located between two water filtration zones.

[0009] When adjacent filter plates press against each other, sludge mixed with high-pressure gas from the flocculation tank is discharged into the filter press zone through the feed pipe, pressing multiple filter plates against each other and forming a sealed filter press zone between adjacent filter plates. The sludge is pressed and filtered in the filter press zone to form a sludge cake, and the water in the sludge is filtered through the filter cloth and enters the water filtration zone to form filtered clear water. The filtered clear water is discharged into the water storage tank through the pipe.

[0010] Optionally, the plurality of sedimentation tanks include a first sedimentation tank, a plurality of intermediate sedimentation tanks, and a last sedimentation tank, wherein the first sedimentation tank, the plurality of intermediate sedimentation tanks, and the last sedimentation tank are arranged in a parallel arrangement in sequence; a first-end partition is provided between the first sedimentation tank and the intermediate sedimentation tanks, an intermediate partition is provided between adjacent intermediate sedimentation tanks, and a last partition is provided between the intermediate partition and the last sedimentation tank.

[0011] After the car wash wastewater is discharged into the first sedimentation tank, it passes through the first partition and enters the intermediate sedimentation tank. After flowing through the intermediate partitions in the multiple sedimentation tanks, it passes through the end partition and enters the end sedimentation tank. The particulate matter in the car wash wastewater settles in the lower part of the multiple sedimentation tanks, and the settled wastewater is discharged into the reaction tank.

[0012] Optionally, along the flow direction of the car wash wastewater in the multiple sedimentation tanks, the top of the first end partition is higher than the top of the middle partition, the top of the end partition is higher than the top of the middle partition, and the top of the end partition is lower than the top of the first end partition.

[0013] Optionally, the flocculant solution is formed by mixing polyacrylamide and water, and the ratio of polyacrylamide to water is 1:(450~550) by mass.

[0014] Optionally, the agitator has a stirring shaft, the bottom of which extends to the middle of the reaction tank; the stirring shaft is provided with multiple stirring blades, which are spaced apart along the axial direction of the stirring shaft; the sedimentation wastewater and the flocculant solution are injected into the reaction tank from the top downwards, and the sedimentation wastewater and the flocculant solution are stirred by the multiple stirring blades in the upper part of the reaction tank to form reaction wastewater, which then flows to the lower part of the reaction tank;

[0015] The lower part of the reaction tank is provided with a reaction connection port. The reaction wastewater in the lower part of the reaction tank, which is in a flowing state, is discharged from bottom to top into the water distribution tank through the reaction connection port for buffering and stabilization.

[0016] Optionally, the lower part of the water distribution tank is provided with a water distribution connection port, through which the sludge and purified water in the water distribution tank are discharged from bottom to top into the flocculation tank; the bottom of the flocculation tank is concave downward, forming multiple concave areas that are larger at the top and smaller at the bottom, and the multiple concave areas are arranged sequentially along the flow direction of the purified water in the flocculation tank, with the tops of adjacent concave areas connected to each other.

[0017] As the sludge and purified water flow along the flocculation tank, the sludge settles in multiple recessed areas and remains stationary, while the purified water is located at the top of the multiple flocculation tanks and is in a flowing state.

[0018] Optionally, the top of the overflow weir extends upward to form an overflow tip; along the width direction of the flocculation tank, the overflow tip is arranged in multiple curved sections to form a wave-like arrangement; the purified water in the flocculation tank passes over the overflow tip and enters the overflow tank.

[0019] Optionally, the filter press includes a thrust plate and a pressing plate, the thrust plate and the pressing plate are arranged facing each other at intervals, there is a filtration interval between the thrust plate and the pressing plate, a plurality of filter plates are arranged in the filtration interval, and the pressing plate is connected to a top pressure shaft that pushes the pressing plate to move toward or away from the thrust plate.

[0020] Two opposing frames are provided between the thrust plate and the clamping plate. The thrust plate is fixedly connected to the ends of the two frames. The multiple filter plates and the clamping plate are movably connected to the two frames respectively. The inner end of the feed pipe communicates with the recessed area. The outer end of the feed pipe passes through the thrust plate and multiple filter plates to form a through section. The through section has a discharge section located in the filter pressing area. The outer periphery of the discharge section is provided with a discharge port.

[0021] The top pressure shaft pushes the clamping plate toward the thrust plate until the multiple filter plates are pressed and clamped between the thrust plate and the clamping plate. The sludge mixed with high-pressure gas is injected into the feed pipe and then into the filter press zone through the discharge port. The sludge in the filter press zone is pressed to form a sludge cake. The water in the sludge is filtered through the filter cloth, enters the water filtration zone, and is discharged through the water outlet on the filter plate.

[0022] Optionally, the feed pipe is equipped with a suction pump, and the inner end of the feed pipe is connected to multiple recessed areas respectively; the inner end of the feed pipe has a suction section extending into the recessed area, the suction section extends upward from the bottom of the recessed area and then bends downward, and the end of the suction section forms an end suction port.

[0023] The suction section has multiple elastic sections made of elastic adhesive layers and multiple hard sections made of hard adhesive layers. The multiple elastic sections and multiple hard sections are arranged at intervals along the length direction of the suction section, and the hard sections are located between two adjacent elastic sections. The hard sections are provided with multiple side suction ports, and the multiple side suction ports are arranged at staggered intervals along the circumference of the hard sections.

[0024] During the process of the suction pump drawing sludge from the depression area through the feed pipe, as the amount of sludge entering the suction section changes, the elastic section undergoes reciprocating expansion and contraction deformation, forming elastic compression and peristalsis on the sludge in the suction section, thus preventing the sludge from forming blockages in the suction section.

[0025] Optionally, the end suction port is covered with an elastic mesh layer, the outer periphery of the elastic mesh layer is fixedly connected to the suction section, and the middle part of the elastic mesh layer is suspended and covers the suction port to form an elastic part; the outer side of the elastic part has an outwardly arc-shaped protruding outer mesh layer, and the inner side of the elastic part has an inwardly arc-shaped protruding inner mesh layer, the outer periphery of the outer mesh layer and the outer periphery of the inner mesh layer are joined together, and the middle parts of the outer mesh layer and the middle parts of the inner mesh layer are arranged separately to form an elastic space;

[0026] During the process of the suction pump drawing sludge from the recessed area through the feed pipe, the sludge enters the suction section after passing through the outer convex mesh layer, the elastic space, and the inner convex mesh layer in sequence. The outer and inner convex mesh layers are squeezed by the sludge and undergo reciprocating elastic deformation, which limits the sludge from forming a blockage at the suction port. During the process of the sludge passing through the outer and inner convex mesh layers, it is elastically squeezed by the outer and inner convex mesh layers and is dispersed.

[0027] Compared with existing technologies, the one-stop green recycling treatment equipment for wastewater purification and sludge dewatering provided by this invention removes particulate matter from car wash wastewater through multi-stage sedimentation using a sedimentation structure. Then, the wastewater is reacted with flocculant in a reaction tank, causing suspended solids, colloids, and flocculated matter to flocculate and form sludge. This effectively treats the wastewater into purified water and sludge. The sludge is then dewatered using a filter press to form mud cake and filtered water. Both the filtered and purified water are stored together in a storage tank via pipelines. In this way, car wash wastewater is converted into mud cake and purified water through a one-stop purification system. The purified water is used for on-site production, car washing, dust suppression, and road cleaning, resulting in a thorough overall treatment process. On the one hand, it significantly reduces the discharge of sludge and wastewater, preventing car wash wastewater from polluting municipal pipelines. On the other hand, the purified water is used for car washing, achieving the recycling of polluted wastewater, saving costs, and being green, environmentally friendly, and pollution-free. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in the foundation pit car wash pool provided by the present invention.

[0029] Figure 2 This is a schematic diagram of the purification structure provided by the present invention;

[0030] Figure 3 This is a schematic diagram of the filter press provided by the present invention;

[0031] Figure 4 This is a schematic diagram showing the connection between the filter plate and the discharge section provided by the present invention;

[0032] Figure 5 This is a partial schematic diagram of the purification structure provided by the present invention;

[0033] Figure 6 This is a schematic diagram of the connection between the flocculation tank and the feed pipe provided by the present invention;

[0034] Figure 7 This is a partial cross-sectional schematic diagram of the feed pipe provided by the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0037] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Reference Figure 1-7 The image shown is a preferred embodiment of the present invention.

[0039] The present invention provides a one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in a car wash pit, comprising a sedimentation structure 100 for flowing sedimentation of car wash wastewater to form sedimented wastewater, a purification structure 200, a filter press 300, and a water storage tank 400; the sedimentation structure 100 has multiple sedimentation tanks arranged in sequence side by side, with the tops of adjacent sedimentation tanks interconnected; the car wash wastewater flows and settles sequentially along the multiple sedimentation tanks, forming particulate sediment at the bottom of the sedimentation tanks and sedimented wastewater discharged from the sedimentation tanks;

[0040] The purification structure includes a reaction tank 201, a water distribution tank 202, a flocculation tank 203, and an overflow tank 204. The reaction tank 201, water distribution tank 202, flocculation tank 203, and overflow tank 204 are connected in sequence and arranged side by side. An overflow weir 210 is provided between the flocculation tank 203 and the overflow tank 204. A stirrer 2010 is provided in the reaction tank 201. The sedimentation wastewater and the flocculation solution are placed in the reaction tank 201 at the same time and are stirred by the stirrer 2010 to form a flowing reaction wastewater.

[0041] The reaction wastewater is discharged into the distribution tank 202 for buffering, forming sludge that settles in the lower part of the distribution tank 202 and is composed of suspended solids, colloids and flocculated flocs, as well as purified water that forms in the upper part of the distribution tank 202; the sludge and purified water are discharged into the flocculation tank 203, the sludge settles in the lower part of the flocculation tank 203, the purified water is located in the upper part of the flocculation tank 203, the purified water overflows into the overflow tank 204 through the overflow weir 210, and the purified water in the overflow tank 204 is discharged into the storage tank 400 through the pipe 220;

[0042] The filter press 300 includes multiple filter plates 304 arranged side by side and moving apart from or towards each other. Filter cloths 305 are respectively covered on both sides of the filter plates 304. The two filter cloths 305 on the filter plates 304 and the filter plates 304 surround each other to form a water filtration zone. When adjacent filter plates 304 are in a state of mutual pressure, the adjacent filter plates 304 surround each other to form a filtration pressing zone, which is located between two water filtration zones.

[0043] When adjacent filter plates 304 press against each other, the sludge mixed with high-pressure gas in the flocculation tank 203 is discharged into the filter press zone through the feed pipe 230, pressing multiple filter plates 304 against each other and forming a sealed filter press zone between adjacent filter plates 304. The sludge is pressed and filtered in the filter press zone to form a sludge cake, and the water in the sludge is filtered through the filter cloth 305 and enters the water filtration zone to form filtered clean water. The filtered clean water is discharged into the water storage tank 400 through the pipe 220.

[0044] The aforementioned one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in car wash pits utilizes a sedimentation structure 100 to remove particulate matter from the wastewater through multi-stage sedimentation. The wastewater is then reacted with flocculant in a reaction tank 201, causing suspended solids, colloids, and flocculated materials to flocculate into sludge in a flocculation tank 203. This effectively treats the wastewater into purified water and sludge. The sludge is then dewatered in a filter press 300 to form a mud cake and filtered water. The filtered and purified water are stored together in a storage tank 400 via pipe 220. In this way, car wash wastewater is converted into mud cake and purified water through a one-stop purification system. The purified water is used for on-site production, car washing, dust suppression, and road cleaning. The overall treatment process is thorough, significantly reducing the discharge of sludge and wastewater and preventing pollution of municipal pipelines 220. Furthermore, the purified water is used for car washing, achieving the recycling of polluted wastewater, cost savings, and a green and pollution-free process.

[0045] Specifically, high-pressure air is injected into the feed pipe 230 through the air compressor 320.

[0046] Multiple sedimentation tanks include a first sedimentation tank 101, multiple intermediate sedimentation tanks 102, and a last sedimentation tank 103, which are arranged side by side in sequence. A first-end partition 110 is provided between the first-end sedimentation tank 101 and the intermediate sedimentation tanks 102, an intermediate partition 120 is provided between adjacent intermediate sedimentation tanks 102, and a last partition 130 is provided between the intermediate partition 120 and the last sedimentation tank 103.

[0047] After being discharged into the initial sedimentation tank 101, the car wash wastewater flows through the initial baffle 110 into the intermediate sedimentation tank 102. It then flows through multiple sedimentation tanks, passing through the intermediate baffle 120 before finally passing through the final baffle 130 into the final sedimentation tank 103. Particulate matter in the wastewater settles at the bottom of each sedimentation tank, and the settled wastewater is discharged into the reaction tank 201. In this way, after the wastewater enters the sedimentation tanks, the suspended particles in the wastewater are separated through sedimentation, utilizing the characteristic that the specific gravity of the particles is greater than that of water. To ensure sedimentation effectiveness, this method specifically incorporates a five-stage sedimentation process in addition to the usual three-stage sedimentation tank. The wastewater after sedimentation is then pumped to the purification structure 200 for secondary treatment.

[0048] Specifically, along the flow direction of the car wash wastewater in the multiple sedimentation tanks, the top of the first baffle 110 is higher than the top of the middle baffle 120, the top of the last baffle 130 is higher than the top of the middle baffle 120, and the top of the last baffle 130 is lower than the top of the first baffle 110. This ensures that most of the particulate sediment accumulates in the first sedimentation tank 101.

[0049] The flocculant solution is formed by mixing polyacrylamide with water. According to the mass ratio, the ratio between polyacrylamide and water is 1:(450~550).

[0050] The agitator 2010 has an agitator shaft, the bottom of which extends to the middle of the reaction tank 201. The agitator shaft is equipped with multiple agitator blades, which are arranged at intervals along the axial direction of the agitator shaft. The sedimentation wastewater and the flocculant solution are injected into the reaction tank 201 from the top downwards. The sedimentation wastewater and the flocculant solution are agitated by the multiple agitator blades in the upper part of the reaction tank 201 to form reaction wastewater, which then flows to the lower part of the reaction tank 201.

[0051] The lower part of the reaction tank 201 is provided with a reaction connection port. The reaction wastewater in the lower part of the reaction tank 201 flows upward through the reaction connection port to the water distribution tank 202 for buffering and stabilization. In this way, the agitator 2010 ensures sufficient reaction, and the design of the water distribution tank 202 prevents the reaction wastewater from flowing too fast when entering the flocculation tank 203.

[0052] The lower part of the water distribution tank 202 is provided with a water distribution connection port. The sludge and purified water in the water distribution tank 202 are discharged from bottom to top into the flocculation tank 203 through the water distribution connection port. The bottom of the flocculation tank 203 is concave downward, forming multiple concave areas 2030 that are larger at the top and smaller at the bottom. The multiple concave areas 2030 are arranged sequentially along the flow direction of the purified water in the flocculation tank 203, and the tops of adjacent concave areas 2030 are interconnected.

[0053] As the sludge and purified water flow into the flocculation tank 203, the sludge settles in multiple recessed zones 2030 and remains stationary, while the purified water is located at the top of the multiple flocculation tanks 203 and is in a flowing state. This design of multiple recessed zones 2030, which are larger at the top and smaller at the bottom, provides space for settling. This allows the sludge to settle as the wastewater enters the flocculation tank 203 from bottom to top, while the purified water flows upwards, causing the sediment to accumulate at the bottom of the recessed zones 2030, ensuring thorough purification.

[0054] The overflow weir 210 extends upwards to form an overflow tip 211. Along the width of the flocculation tank 203, the overflow tip 211 is arranged in multiple curved sections, forming a wave-like pattern. The purified water in the flocculation tank 203 flows over the overflow tip 211 and into the overflow tank 204. In this way, the overflow weir 210 effectively intercepts and retains sludge and suspended solids in the flocculation tank 203, ensuring that only clean, purified water at the top can flow over the weir tip into the overflow tank 204. This helps ensure the quality of the purified water and provides a high-quality water source for subsequent use.

[0055] Next, the overflow tip 211 is arranged in a wave-like pattern, which enhances the structural stability of the weir and increases the overflow area, allowing more purified water to flow smoothly into the overflow pool 204. Furthermore, it slows down the water flow velocity, enabling the purified water to be distributed more evenly as it crosses the weir crest, reducing impact and wear on the weir and extending its service life.

[0056] The filter press 300 includes a thrust plate 302 and a pressing plate 303. The thrust plate 302 and the pressing plate 303 are arranged facing each other at intervals. There is a filter press interval between the thrust plate 302 and the pressing plate 303. Multiple filter plates 304 are arranged in the filter press interval. The pressing plate 303 is connected to a top pressure shaft 3010 that pushes the pressing plate 303 to move toward or away from the thrust plate 302.

[0057] Two opposing frames 301 are provided between the thrust plate 302 and the clamping plate 303. The thrust plate 302 is fixedly connected to the ends of the two frames 301. Multiple filter plates 304 and the clamping plate 303 are movably connected to the two frames 301 respectively. The inner end of the feed pipe 230 communicates with the recessed area 2030. The outer end of the feed pipe 230 passes through the thrust plate 302 and multiple filter plates 304 to form a through section. The through section has a discharge section 3000 located in the filter pressing area. The discharge section 3000 has a discharge port on its outer periphery.

[0058] The top pressure shaft 3010 pushes the clamping plate 303 toward the thrust plate 302 until multiple filter plates 304 are pressed and clamped between the thrust plate 302 and the clamping plate 303. Sludge mixed with high-pressure gas is injected into the feed pipe 230 and then into the filter press zone through the discharge port. The sludge in the filter press zone is pressed to form a sludge cake, while the water in the sludge is filtered through the filter cloth 305 and enters the water filtration zone, exiting through the outlet 3040 on the filter plate 304. Thus, through the filtration effect of the filter cloth 305, purified water enters the water filtration zone, while the sludge remains in the filter press zone and is discharged through the outlet 3040.

[0059] In this embodiment, a suction pump 310 is provided on the feed pipe 230, and the inner end of the feed pipe 230 is connected to a plurality of recessed areas 2030 respectively; the inner end of the feed pipe 230 has a suction section extending into the recessed area 2030, the suction section extends upward from the bottom of the recessed area 2030 and then bends downward, and the end of the suction section forms an end suction port.

[0060] The suction section has multiple elastic segments 232 made of elastic adhesive layers and multiple hard segments 231 made of hard adhesive layers. The multiple elastic segments 232 and multiple hard segments 231 are arranged at intervals along the length direction of the suction section, and the hard segments 231 are located between two adjacent elastic segments 232. The hard segments 231 are provided with multiple side suction ports 2310, and the multiple side suction ports 2310 are arranged at staggered intervals along the circumference of the hard segments 231.

[0061] During the process of the suction pump 310 drawing sludge from the recessed area 2030 through the feed pipe 230 using frequency conversion, the elastic section 232 undergoes reciprocating expansion and contraction deformation as the amount of sludge entering the suction section changes. This creates elastic compression and peristalsis on the sludge in the suction section, preventing sludge from forming blockages. Thus, the suction section employs an alternating design of elastic and hard rubber layers, ensuring both flexibility and enhanced durability. Multiple side suction ports 2310 on the hard section 231 effectively extract sludge, while the reciprocating expansion and contraction deformation of the elastic section 232 prevents sludge from forming blockages in the suction section. This improves sludge extraction efficiency and reduces the risk of blockages.

[0062] In this embodiment, the end suction port is covered with an elastic mesh layer 233. The outer periphery of the elastic mesh layer 233 is fixedly connected to the suction section. The middle part of the elastic mesh layer 233 is suspended and covers the suction port to form an elastic part. The outer side of the elastic part has an outwardly arc-shaped protruding outer mesh layer 234, and the inner side of the elastic part has an inwardly arc-shaped protruding inner mesh layer 235. The outer periphery of the outer mesh layer 234 and the outer periphery of the inner mesh layer 235 are joined together. The middle part of the outer mesh layer 234 and the middle part of the inner mesh layer 235 are arranged separately to form an elastic space.

[0063] During the process of the suction pump 310 drawing sludge from the recessed area 2030 through the feed pipe 230, the sludge sequentially passes through the outer convex mesh layer 234, the elastic space, and the inner convex mesh layer 235 before entering the suction section. The outer and inner convex mesh layers 234 and 235 are compressed by the sludge, exhibiting reciprocating elastic deformation, thus preventing sludge from clogging the suction port. As the sludge passes through the outer and inner convex mesh layers 234 and 235, it is elastically compressed and dispersed. Therefore, through the combined design of the outer convex mesh layer 234, the elastic space, and the inner convex mesh layer 235, the sludge passes through these three parts sequentially during the suction process, effectively dispersing the sludge, preventing sludge from clogging the suction port, and increasing the contact area between the sludge and the suction port, thereby improving suction efficiency.

[0064] Secondly, the elastic deformation characteristics of the outwardly convex mesh layer 234 and the inwardly convex mesh layer 235 can handle sludge of different properties. When the sludge is denser, the outwardly convex mesh layer 234 and the inwardly convex mesh layer 235 are subjected to greater compression, resulting in greater elastic deformation and ensuring that the sludge can pass through smoothly. When the sludge is looser, the elastic deformation of the outwardly convex mesh layer 234 and the inwardly convex mesh layer 235 is relatively smaller, but it can still maintain a certain dispersing effect. This adaptive elastic deformation characteristic makes the suction process more stable and reliable. This improves the operating efficiency of the entire treatment system, reduces downtime caused by blockages, and improves the continuity and stability of the entire treatment system.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A one-stop green recycling treatment equipment for wastewater purification and sludge depressurization in foundation pit car wash pools, characterized in that: The system includes a sedimentation structure, a purification structure, a filter press, and a water storage tank for the flow and sedimentation of car wash wastewater to form precipitated wastewater. The sedimentation structure has multiple sedimentation tanks arranged in sequence and side by side, with the tops of adjacent sedimentation tanks interconnected. The car wash wastewater flows and settles sequentially along the multiple sedimentation tanks, forming particulate sediment at the bottom of the sedimentation tanks and precipitated wastewater discharged from the sedimentation tanks. The purification structure includes a reaction tank, a water distribution tank, a flocculation tank, and an overflow tank. The reaction tank, water distribution tank, flocculation tank, and overflow tank are connected in sequence and arranged side by side. An overflow weir is provided between the flocculation tank and the overflow tank. A stirrer is provided in the reaction tank. The sedimentation wastewater and the flocculation solution are placed in the reaction tank at the same time and stirred by the stirrer to form a flowing reaction wastewater. The reaction wastewater is discharged into a distribution tank for buffering, forming sludge that settles in the lower part of the distribution tank and is composed of suspended solids, colloids, and flocculated flocs, as well as purified water that forms in the upper part of the distribution tank; the sludge and purified water are discharged into a flocculation tank, the sludge settles in the lower part of the flocculation tank, the purified water is located in the upper part of the flocculation tank, the purified water overflows into an overflow tank through an overflow weir, and the purified water in the overflow tank is discharged into a storage tank through a pipe; The filter press includes multiple filter plates arranged side by side and moving apart from or towards each other. Each filter plate is covered with a filter cloth on both sides. The two filter cloths on the filter plate and the filter plate surround each other to form a water filtration zone. When the adjacent filter plates are in a state of mutual pressure, the adjacent filter plates surround each other to form a filtration pressing zone. The filtration pressing zone is located between two water filtration zones. When adjacent filter plates press against each other, sludge mixed with high-pressure gas in the flocculation tank is discharged into the filter press zone through the feed pipe, pressing multiple filter plates against each other and forming a sealed filter press zone between adjacent filter plates. The sludge is pressed and filtered in the filter press zone to form a sludge cake, and the water in the sludge is filtered through the filter cloth and enters the water filtration zone to form filtered clear water. The filtered clear water is discharged into the water storage tank through the pipe. The lower part of the water distribution tank is provided with a water distribution connection port. The sludge and purified water in the water distribution tank are discharged from bottom to top into the flocculation tank through the water distribution connection port. The bottom of the flocculation tank is concave downward, forming multiple concave areas that are larger at the top and smaller at the bottom. The multiple concave areas are arranged sequentially along the flow direction of the purified water in the flocculation tank, and the tops of adjacent concave areas are interconnected. As the sludge and purified water flow along the flocculation tank, the sludge settles in multiple depressions and remains stationary, while the purified water is located at the top of the multiple flocculation tanks and is in a flowing state. The feed pipe is equipped with a suction pump, and the inner end of the feed pipe is connected to multiple recessed areas respectively; the inner end of the feed pipe has a suction section extending into the recessed area, the suction section extends upward from the bottom of the recessed area and then bends downward, and the end of the suction section forms an end suction port. The suction section has multiple elastic sections made of elastic adhesive layers and multiple hard sections made of hard adhesive layers. The multiple elastic sections and multiple hard sections are arranged at intervals along the length direction of the suction section, and the hard sections are located between two adjacent elastic sections. The hard sections are provided with multiple side suction ports, and the multiple side suction ports are arranged at staggered intervals along the circumference of the hard sections. During the process of the suction pump drawing sludge from the depression area through the feed pipe, as the amount of sludge entering the suction section changes, the elastic section reciprocates and expands, forming elastic compression and peristalsis on the sludge in the suction section, thus limiting the sludge from forming blockages in the suction section. The end suction port is covered with an elastic mesh layer. The outer periphery of the elastic mesh layer is fixedly connected to the suction section. The middle part of the elastic mesh layer is suspended and covers the suction port, forming an elastic part. The outer side of the elastic part has an outwardly arc-shaped convex mesh layer, and the inner side of the elastic part has an inwardly arc-shaped convex mesh layer. The outer periphery of the outwardly convex mesh layer and the outer periphery of the inwardly convex mesh layer are joined together. The middle parts of the outwardly convex mesh layer and the middle parts of the inwardly convex mesh layer are arranged separately to form an elastic space. During the process of the suction pump drawing sludge from the recessed area through the feed pipe, the sludge enters the suction section after passing through the outer convex mesh layer, the elastic space, and the inner convex mesh layer in sequence. The outer and inner convex mesh layers are squeezed by the sludge and undergo reciprocating elastic deformation, which limits the sludge from forming a blockage at the suction port. During the process of the sludge passing through the outer and inner convex mesh layers, it is elastically squeezed by the outer and inner convex mesh layers and is dispersed.

2. The one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in a foundation pit car wash pool as described in claim 1, characterized in that, The plurality of sedimentation tanks include a first sedimentation tank, a plurality of intermediate sedimentation tanks and a last sedimentation tank, wherein the first sedimentation tank, the plurality of intermediate sedimentation tanks and the last sedimentation tank are arranged in a row in sequence; a first-end partition is provided between the first sedimentation tank and the intermediate sedimentation tanks, a middle partition is provided between adjacent intermediate sedimentation tanks, and a last partition is provided between the middle partition and the last sedimentation tank. After the car wash wastewater is discharged into the first sedimentation tank, it passes through the first partition and enters the intermediate sedimentation tank. After flowing through the intermediate partitions in the multiple sedimentation tanks, it passes through the end partition and enters the end sedimentation tank. The particulate matter in the car wash wastewater settles in the lower part of the multiple sedimentation tanks, and the settled wastewater is discharged into the reaction tank.

3. The one-stop green recycling treatment equipment for wastewater purification and sludge depressurization of pit car wash pools as described in claim 2, characterized in that, Along the flow direction of the car wash wastewater in multiple sedimentation tanks, the top of the first end partition is higher than the top of the middle partition, the top of the last end partition is higher than the top of the middle partition, and the top of the last end partition is lower than the top of the first end partition.

4. The one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in a foundation pit car wash pool as described in claim 1, characterized in that, The flocculant solution is formed by mixing polyacrylamide and water, and the ratio of polyacrylamide to water is 1:(450~550) by mass.

5. The one-stop green recycling treatment equipment for wastewater purification and sludge depressurization of pit car wash pools as described in claim 1, characterized in that, The agitator has an agitator shaft, the bottom of which extends to the middle of the reaction tank; the agitator shaft is provided with multiple agitator blades, which are spaced apart along the axial direction of the agitator shaft; the sedimentation wastewater and the flocculant solution are injected into the reaction tank from the top downwards, and the sedimentation wastewater and the flocculant solution are agitated by the multiple agitator blades in the upper part of the reaction tank to form reaction wastewater, which then flows to the lower part of the reaction tank; The lower part of the reaction tank is provided with a reaction connection port. The reaction wastewater in the lower part of the reaction tank, which is in a flowing state, is discharged from bottom to top into the water distribution tank through the reaction connection port for buffering and stabilization.

6. The one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in pit car wash pools as described in any one of claims 1 to 5, characterized in that, The top of the overflow weir extends upward to form an overflow tip; along the width of the flocculation tank, the overflow tip is arranged in multiple curved sections to form a wave-like arrangement; the purified water in the flocculation tank passes over the overflow tip and enters the overflow tank.

7. The one-stop green recycling treatment equipment for wastewater purification and sludge dewatering in foundation pit car wash pools as described in any one of claims 1 to 5, characterized in that, The filter press includes a thrust plate and a pressing plate. The thrust plate and the pressing plate are arranged facing each other at intervals. There is a filtration interval between the thrust plate and the pressing plate. A plurality of filter plates are arranged in the filtration interval. The pressing plate is connected to a top pressure shaft that pushes the pressing plate to move toward or away from the thrust plate. Two opposing frames are provided between the thrust plate and the clamping plate. The thrust plate is fixedly connected to the ends of the two frames. The multiple filter plates and the clamping plate are movably connected to the two frames respectively. The inner end of the feed pipe communicates with the recessed area. The outer end of the feed pipe passes through the thrust plate and multiple filter plates to form a through section. The through section has a discharge section located in the filter pressing area. The outer periphery of the discharge section is provided with a discharge port. The top pressure shaft pushes the clamping plate toward the thrust plate until the multiple filter plates are pressed and clamped between the thrust plate and the clamping plate. The sludge mixed with high-pressure gas is injected into the feed pipe and then into the filter press zone through the discharge port. The sludge in the filter press zone is pressed to form a sludge cake. The water in the sludge is filtered through the filter cloth, enters the water filtration zone, and is discharged through the water outlet on the filter plate.

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