Mud-containing wastewater recycling system based on stacked screw dehydration and fiber filtration

Abstract

The utility model relates to the technical field of water treatment, in particular to a mud-containing wastewater recycling system based on stacked screw dehydration and fiber filtration, which comprises a pretreatment tank, a middle tank and a clean water tank which are sequentially arranged, a primary purification device is arranged between the pretreatment tank and the middle tank, and the primary purification device comprises a concentration part and a dehydration part; a secondary purification device is arranged between the middle tank and the clean water tank and comprises a filtering assembly. According to the utility model, the mud-containing wastewater is purified for multiple times, so that particulate matters with different particle sizes in the wastewater are effectively removed, and the wastewater treatment effect is improved; the dosage of the medicament is reduced, the treatment cost is reduced, and meanwhile, the potential influence of the medicament on the environment is avoided. The recycling of the wastewater is realized, the water resource is saved, and the green and environment-friendly sustainable development concept is met.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a mud-containing wastewater recycling system based on screw stacking dehydration and fiber filtration. Background Art

[0002] During the car washing process at the construction site, the muddy wastewater generated contains particles of various sizes, including clay, silt, sand, gravel particles and pebbles. Traditional wastewater treatment methods often involve the addition of a large amount of chemicals, which are used to settle and decompose impurities in the wastewater, etc. This not only increases the treatment cost, but may also cause secondary pollution to the environment. At the same time, the wastewater treated by traditional treatment methods contains a large amount of additives, which is not suitable for rapid secondary use. It needs to be re-purified before it can be recycled in the future. This involves multiple steps such as wastewater collection and storage, and the process is cumbersome and the cost investment is high.

[0003] It can be seen that the current muddy wastewater treatment process still has room for improvement. It should be optimized to simplify the wastewater treatment process, reduce the cost investment, and put the treated water into secondary use more quickly to save costs. Therefore, a more reasonable technical solution should be proposed to solve the technical problems existing in the existing technology. Utility Model Content

[0004] In order to overcome at least one of the above-mentioned defects, the utility model proposes a mud-containing wastewater recycling system based on spiral dehydration and fiber filtration, which achieves better purification effect by differentially purifying particulate matter in the wastewater.

[0005] In order to achieve the above purpose, the recycling system disclosed in the utility model can adopt the following technical solutions:

[0006] A muddy wastewater recycling system based on spiral dehydration and fiber filtration comprises a pretreatment tank, an intermediate tank and a clear water tank which are arranged in sequence; a primary purification device is arranged between the pretreatment tank and the intermediate tank, and the primary purification device comprises a concentration part and a dehydration part; a secondary purification device is arranged between the intermediate tank and the clear water tank, and the secondary purification device comprises a filtering component.

[0007] The above disclosed recycling system sequentially separates and purifies the muddy wastewater through the pretreatment tank, concentrates and dehydrates it in the primary purification device, and filters and purifies it in the secondary purification device to obtain relatively clean treated water, which can be used for subsequent secondary use, such as watering plants, washing vehicles, etc. This not only simplifies the treatment process of muddy wastewater, ensures the treatment effect, enables it to be quickly put into secondary use, reduces pollution and damage to the environment, but also reduces the cost of treatment.

[0008] Furthermore, the primary purification device in the utility model can separate a large number of particles from water in the muddy wastewater. Its structure can be realized through a variety of schemes and is not limited to a single one. Here, it is optimized and one of the feasible options is proposed: the primary purification device includes a conveying cylinder for conveying muddy wastewater, and a spiral auger is arranged in the conveying cylinder. The spiral auger conveys the muddy wastewater from the inlet end to the outlet end of the conveying cylinder; the lower part of the conveying cylinder is provided with a seepage structure to seep water downward, and the cavity wall of the conveying cylinder is provided with a fixed ring and a floating ring, and the front half of the conveying cylinder is used to cooperate with the concentration of muddy wastewater, and the rear half is used to cooperate with the dehydration of muddy wastewater. The outlet end of the conveying cylinder is provided with a back pressure plate to compress the sludge to form solids and discharge the conveying cylinder. When such a scheme is adopted, the sludge treated by concentration and dehydration eventually forms a mud cake and other structures.

[0009] Furthermore, the structure of the spiral dragon rod can be constructed in various forms, which are not limited to a single one. Here, an optimization is made and one of the feasible options is proposed: the spiral dragon rod includes a rod body extending along the length direction of the conveying cylinder, and the rod diameter of the rod body gradually increases. A spiral winding sheet is provided on the rod body, and the outer diameter of the spiral winding sheet is fixed. When such a scheme is adopted, as the muddy wastewater moves toward the outlet end of the conveying cylinder, the gap between the rod body and the inner cylinder wall of the conveying cylinder is reduced, which plays a role in squeezing and promoting dehydration.

[0010] Furthermore, in the present invention, the structure of the primary purification device is not limited to a single one, and can be optimized. Here, one feasible option is proposed: the primary purification device also includes a stirring part, and the stirring part includes a stirring chamber connected to the pretreatment tank, and a stirring assembly is provided in the stirring chamber, and the muddy wastewater enters the conveying cylinder after being stirred. When such a solution is adopted, the stirring part includes a stirring motor and a stirring shaft, and the stirring shaft extends into the stirring chamber and is connected to a stirring rod or a stirring frame.

[0011] Furthermore, the structure of the stirring chamber is optimized and a feasible option is proposed: the stirring chamber is provided with a venting pipe. When such a solution is adopted, the number of the venting pipe is at least one and is provided at the bottom of the stirring chamber.

[0012] Furthermore, the structure of the secondary purification device can adopt a variety of schemes, which are not limited to the only one. Here, optimization is made and one feasible option is proposed: the secondary purification device includes a purification cylinder, a water inlet is arranged at the bottom of the purification cylinder and a water outlet is arranged at the top; the filter assembly is arranged in the purification cylinder. When such a scheme is adopted, water is introduced from the bottom of the purification cylinder and the water pressure is gradually increased, and the muddy wastewater is purified by passing through the filter assembly under the action of the water pressure.

[0013] Furthermore, the filter assembly structure used in the utility model is not limited to a single one, and an optimization is made here and one of the feasible options is proposed: the filter assembly includes a plurality of longitudinally arranged fiber bundles, and the upper and lower ends of the fiber bundles are respectively connected to the upper hanging plate and the lower hanging plate, and the upper hanging plate and the lower hanging plate are also connected to the rotating shaft and rotate synchronously with the rotating shaft. When such a solution is adopted, the upper hanging plate and the lower hanging plate are provided with water holes or water gaps.

[0014] Further, the structure of the filter assembly is optimized, and one feasible option is proposed here: the inner wall of the purification cylinder is also provided with a supporting rib structure for supporting the lower hanging plate. When such a solution is adopted, the supporting rib structure includes a plurality of rib members distributed at intervals along the inner wall of the purification cylinder.

[0015] Furthermore, in order to help improve the overall stability of the filter assembly, an optimization is made here and a feasible option is proposed: the bottom of the rotating shaft is also provided with a bottom support structure for supporting the lower hanging plate. When such a solution is adopted, the bottom support structure is sleeved on the rotating shaft and is tightened by a screw or a clamping set.

[0016] Furthermore, in the utility model, the pretreatment tank performs initial treatment on the mud-containing wastewater and separates a large amount of impurities therein. The structure of the pretreatment tank is not limited to a single one. It is optimized here and one of the feasible options is proposed: the pretreatment tank, the intermediate tank and the clear water tank are all reinforced concrete structures, and a mud discharge pipe is provided at the bottom of the pretreatment tank. The secondary purification device is connected to the pretreatment tank through a flushing water discharge pipe and discharges flushing water to the pretreatment tank.

[0017] Compared with the prior art, some beneficial effects of the technical solution disclosed in the utility model include:

[0018] The utility model realizes the effective removal of particles of different particle sizes in the wastewater through multiple purification treatments of muddy wastewater, improves the wastewater treatment effect, reduces the dosage of the reagent, reduces the treatment cost, and avoids the potential impact of the reagent on the environment. It realizes the recycling of wastewater, saves water resources, and conforms to the concept of green and environmentally friendly sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The schematic diagram of the overall composition of the system.

[0021] Figure 2 It is a schematic diagram of the structure inside the conveying cylinder.

[0022] Figure 3 Schematic diagram of the interior of the secondary purification device.

[0023] In the above drawings, the meanings of the various marks are as follows:

[0024] 1. Pretreatment tank; 2. Lifting pump; 3. Stirring part; 4. Vent pipe; 5. Stirring assembly; 6. Conveying cylinder; 601. Rod body; 602. Spiral winding sheet; 603. Cavity wall; 604. Fixed ring; 605. Moving ring; 7. Intermediate tank; 8. Secondary purification device; 801. Sealing shaft; 802. Water outlet pipe; 803. Rotating shaft; 804. Upper hanging plate; 805. Fiber bundle; 806. Lower hanging plate; 807. Support rib structure; 808. Bottom support; 809. Water inlet pipe; 9. Flushing water discharge pipe; 10. Clean tank. DETAILED DESCRIPTION

[0025] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0026] In view of the low efficiency, poor effect and environmental damage in the treatment of muddy wastewater in the prior art, the following embodiments are optimized and overcome the defects in the prior art.

[0027] Example

[0028] like Figure 1 to Figure 3 As shown, this embodiment provides a mud-containing wastewater recycling system based on spiral dehydration and fiber filtration, including a pretreatment tank 1, an intermediate tank 7 and a clear water tank arranged in sequence, a primary purification device is arranged between the pretreatment tank 1 and the intermediate tank 7, and the primary purification device includes a concentration part and a dehydration part; a secondary purification device 8 is arranged between the intermediate tank 7 and the clear water tank, and the secondary purification device 8 includes a filtering component.

[0029] The recycling system disclosed in this embodiment sequentially performs pre-separation and purification of muddy wastewater through the pre-treatment tank 1, concentration and dehydration purification treatment of the primary purification device, and filtration and purification treatment of the secondary purification device 8 to obtain relatively clean treated water, which can be used for subsequent secondary use, such as watering vegetation, washing vehicles, etc. This not only simplifies the treatment process of muddy wastewater, ensures the treatment effect, can quickly put it into secondary use, reduces pollution and damage to the environment, but also reduces the cost of treatment.

[0030] The primary purification device in this embodiment can separate a large number of particles from water in the muddy wastewater. Its structure can be realized by a variety of schemes and is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: the primary purification device includes a conveying cylinder 6 for conveying muddy wastewater, and a spiral auger rod is arranged in the conveying cylinder 6. The spiral auger rod conveys the muddy wastewater from the inlet end of the conveying cylinder 6 to the outlet end; the lower part of the conveying cylinder 6 is provided with a water seepage structure to seep water downward, and the cavity wall 603 of the conveying cylinder 6 is provided with a fixed ring 604 and a floating ring 605, and the front half of the conveying cylinder is used to cooperate with the concentration of muddy wastewater, and the rear half is used to cooperate with the dehydration of muddy wastewater. The outlet end of the conveying cylinder 6 is provided with a back pressure plate to compress the sludge to form solids and discharge the conveying cylinder 6. When such a scheme is adopted, the sludge treated by concentration and dehydration eventually forms a mud cake and other structures.

[0031] The structure of the spiral dragon rod can be constructed in various forms, which are not limited to the only one. This embodiment is optimized and adopts one of the feasible options: the spiral dragon rod includes a rod body 601 extending along the length direction of the conveying cylinder 6, and the rod diameter of the rod body 601 gradually increases. The rod body 601 is provided with a spiral winding sheet 602, and the outer diameter of the spiral winding sheet 602 is fixed. When such a scheme is adopted, as the muddy wastewater moves toward the outlet end of the conveying cylinder 6, the gap between the rod body 601 and the inner cylinder wall of the conveying cylinder 6 is reduced, which plays a role in squeezing and promoting dehydration.

[0032] In this embodiment, the structure of the primary purification device is not limited to a single one, and can be optimized. This embodiment adopts one of the feasible options: the primary purification device also includes a stirring part 3, and the stirring part 3 includes a stirring chamber connected to the pretreatment tank 1. The stirring chamber is provided with a stirring assembly 5, and the muddy wastewater is stirred and then enters the conveying cylinder 6. When such a solution is adopted, the stirring part 3 includes a stirring motor and a stirring shaft, and the stirring shaft extends into the stirring chamber and is connected to a stirring rod or a stirring frame.

[0033] The structure of the stirring chamber is optimized and one of the feasible options is adopted: the stirring chamber is provided with a vent pipe 4. When such a solution is adopted, the number of the vent pipe 4 is at least one and is arranged at the bottom of the stirring chamber.

[0034] The structure of the secondary purification device 8 can adopt a variety of schemes, which are not limited to the only one. This embodiment optimizes and adopts one of the feasible options: the secondary purification device 8 includes a purification cylinder, the bottom of the purification cylinder is provided with a water inlet and the top is provided with a water outlet; the filter assembly is arranged in the purification cylinder. When such a scheme is adopted, water is introduced from the bottom of the purification cylinder and the water pressure is gradually increased. Under the action of the water pressure, the muddy wastewater passes through the filter assembly and is purified.

[0035] The structure of the filter assembly used in this embodiment is not limited to a single one, and this embodiment is optimized and adopts one of the feasible options: the filter assembly includes a plurality of longitudinally arranged fiber bundles 805, and the upper and lower ends of the fiber bundles 805 are respectively connected to the upper hanging plate 804 and the lower hanging plate 806, and the upper hanging plate 804 and the lower hanging plate 806 are also connected to the rotating shaft 803 and rotate synchronously with the rotating shaft 803. When such a solution is adopted, the upper hanging plate 804 and the lower hanging plate 806 are provided with water holes or water gaps.

[0036] Preferably, the upper end of the rotating shaft 803 is connected to the sealing shaft 801 .

[0037] To optimize the structure of the filter assembly, this embodiment adopts one of the feasible options: the inner wall of the purification cylinder is also provided with a supporting rib structure 807 for supporting the lower hanging plate 806. When such a solution is adopted, the supporting rib structure 807 includes a plurality of rib members spaced apart along the inner wall of the purification cylinder.

[0038] In order to help improve the overall stability of the filter assembly, this embodiment is optimized and adopts a feasible option: the bottom of the rotating shaft 803 is also provided with a bottom support 808 structure for supporting the lower hanging plate 806. When such a solution is adopted, the bottom support 808 structure is sleeved on the rotating shaft 803 and is tightened by a screw or a clamping set.

[0039] In this embodiment, the pretreatment tank 1 performs initial treatment on the muddy wastewater and separates a large amount of impurities therein. The structure of the pretreatment tank 1 is not limited to a single one. This embodiment is optimized and adopts one of the feasible options: the pretreatment tank 1, the intermediate tank 7 and the clear water tank are all reinforced concrete structures, and a mud discharge pipe is provided at the bottom of the pretreatment tank 1. The secondary purification device 8 is connected to the pretreatment tank 1 through a flushing water discharge pipe 9 and discharges flushing water to the pretreatment tank 1. When such a scheme is adopted, a lifting pump 2 is provided in the pretreatment tank 1, and the muddy wastewater is transported to the primary purification device through the lifting pump 2.

[0040] According to the above scheme, several actual cases are listed below to illustrate its effect.

[0041] The pretreatment tank 1 is made of reinforced concrete and is provided with a water inlet, a water outlet and a sewage outlet. Wastewater enters the pretreatment tank 1 through the water inlet for preliminary sedimentation and separation. A mud discharge pipe is provided at the bottom of the pretreatment tank 1 for regular discharge of sediment.

[0042] The main body of the spiral stack dewatering machine is composed of a filter body and a spiral shaft. The filter body is divided into two parts: concentration and dewatering. After the sludge enters the filter body, the relative movement of the fixed ring 604 and the movable ring is used to quickly discharge the filtrate through the gap between the stacked sheets, quickly concentrate, and push the sludge to the dewatering part. After the sludge enters the dewatering part, the space in the filter chamber continues to shrink, the internal pressure of the sludge continues to increase, and the back pressure of the back pressure plate at the mud outlet causes it to be dehydrated, and the dry mud is continuously discharged from the machine. The effluent of the spiral stack dewatering machine flows into the intermediate tank 7.

[0043] The fiber filter is made of polymer fiber material and has high filtering accuracy and adsorption capacity. Wastewater enters from the water inlet of the fiber filter, and small-size particles in the wastewater are removed through the filtration and adsorption of the fiber material. The water outlet of the fiber filter is connected to the water inlet of the clean water tank. The clean water tank adopts reinforced concrete structure or carbon steel structure, and is equipped with water inlet and water outlet. The purified water treated by the fiber filter is collected in the clean water tank. The water outlet of the clean water tank can be used for recycling such as car washing on construction sites.

[0044] Case 1

[0045] Each mud truck at the construction site will generate about 0.4m per cleaning. 3 of sediment wastewater, generating about 80m 3 / d, the mud content (SS) is 20000-30000mg / L. The mud is yellow-brown, alkaline, and has a relative density of 1.10g / cm 3 , slightly higher than water, with a Zeta potential of -20.1mV, negatively charged, good stability, not easy to precipitate, high mud colloid rate, good dispersibility, slow sedimentation rate, and the time required to achieve mud-water separation effect under natural conditions is more than 8h. First, build a car wash wastewater collection pool, remove large particles through the grille, and then use the sludge pump to pump the wastewater into the spiral stacking equipment for dehydration treatment to remove most of the particles, and then flow into the fiber filter for filtration to remove fine particles. Finally, the wastewater treated by fiber filtration is introduced into the clear water tank, and the mud removal rate is about 99.5%. Finally, it is reused for car washing on the construction site through the pumping system to achieve the recycling of wastewater.

[0046] Case 2

[0047] The particle size of sandy wastewater is 0.1-1μm, accounting for about 4%; the particle size of 1-10μm, accounting for about 35%; the particle size of 10-100μm, accounting for about 57%; the particle size of 100-1000μm and above, accounting for about 4%. Mud particles with a particle size less than 15um have good dispersibility, and it is difficult to separate mud and water under natural conditions. This embodiment adds a set of dosing equipment on the basis of embodiment 1. By adding cationic PAM with a mass concentration of 0.002-0.003, the sediment wastewater is conditioned to increase the particle removal capacity of the spiral stacking equipment.

[0048] Case 3

[0049] This embodiment improves the filter material of the fiber filter on the basis of Case 2. A filter material with better interception ability is selected, and the filter pore size is 5um, which improves the interception ability of the fiber filter.

[0050] In the above cases, physical methods were mainly used to reduce the use of chemical agents, reduce treatment costs, and reduce secondary pollution to the environment. The combination of spiral dehydrator and fiber filter effectively removed solid particles in the wastewater, improving the efficiency and water quality of wastewater treatment. The process is simple, easy to operate and maintain, and suitable for promotion and use in construction sites of all sizes.

[0051] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. A system for recycling muddy wastewater based on screw press dehydration and fiber filtration, characterized by: The invention comprises a pretreatment tank (1), an intermediate tank (7) and a clean water tank which are arranged in sequence. A primary purification device is arranged between the pretreatment tank (1) and the intermediate tank (7), and the primary purification device comprises a concentration part and a dehydration part. A secondary purification device (8) is arranged between the intermediate tank (7) and the clean water tank, and the secondary purification device (8) comprises a filtering component.

2. The sludge-containing wastewater recycling system based on screw press dehydration and fiber filtration according to claim 1 is characterized by: The primary purification device comprises a conveying cylinder (6) for conveying muddy wastewater, wherein a spiral auger is arranged inside the conveying cylinder (6), and the spiral auger conveys the muddy wastewater from the inlet end to the outlet end of the conveying cylinder (6); a water seepage structure is arranged at the lower part of the conveying cylinder (6) to seep water downward, and a cavity wall (603) of the conveying cylinder (6) is provided with a fixed ring (604) and a floating ring (605), and the front half of the conveying cylinder is used to cooperate with the concentration of the muddy wastewater, and the rear half is used to cooperate with the dehydration of the muddy wastewater, and a back pressure plate is arranged at the outlet end of the conveying cylinder (6) to compress the sludge to form solids and discharge them from the conveying cylinder (6).

3. The sludge-containing wastewater recycling system based on screw press dehydration and fiber filtration according to claim 2 is characterized in that: The spiral auger rod comprises a rod body (601) extending along the length direction of the conveying cylinder (6), and the rod diameter of the rod body (601) gradually increases. A spiral winding sheet (602) is provided on the rod body (601), and the outer diameter of the spiral winding sheet (602) is fixed.

4. The sludge-containing wastewater recycling system based on screw press dehydration and fiber filtration according to claim 1 is characterized in that: The primary purification device further comprises a stirring portion (3), the stirring portion (3) comprising a stirring chamber connected to the pretreatment tank (1), a stirring assembly (5) being arranged in the stirring chamber and the muddy wastewater is stirred and then enters the conveying cylinder (6).

5. The sludge-containing wastewater recycling system based on screw press dehydration and fiber filtration according to claim 4 is characterized in that: The stirring chamber is provided with a vent pipe (4).

6. The sludge-containing wastewater recycling system based on screw press dehydration and fiber filtration according to claim 1 is characterized by: The secondary purification device (8) comprises a purification cylinder, a water inlet is arranged at the bottom of the purification cylinder and a water outlet is arranged at the top; the filter assembly is arranged in the purification cylinder.

7. The sludge-containing wastewater recycling system based on screw press dehydration and fiber filtration according to claim 6 is characterized by: The filtering assembly comprises a plurality of longitudinally arranged fiber bundles (805), wherein the upper and lower ends of the fiber bundles (805) are respectively connected to an upper hanging plate (804) and a lower hanging plate (806), and the upper hanging plate (804) and the lower hanging plate (806) are also connected to a rotating shaft (803) and rotate synchronously with the rotating shaft (803).

8. The sludge-containing wastewater recycling system based on screw press dehydration and fiber filtration according to claim 7 is characterized in that: The inner wall surface of the purification cylinder is also provided with a supporting rib structure (807) for supporting the lower hanging plate (806).

9. The system for recycling muddy wastewater based on screw press dehydration and fiber filtration according to claim 7 is characterized in that: The bottom of the rotating shaft (803) is also provided with a bottom support (808) structure for supporting the lower hanging plate (806).

10. The sludge-containing wastewater recycling system based on screw press dehydration and fiber filtration according to claim 1 is characterized by: The pretreatment tank (1), the intermediate tank (7) and the clean water tank are all made of reinforced concrete structures. A mud discharge pipe is provided at the bottom of the pretreatment tank (1). The secondary purification device (8) is connected to the pretreatment tank (1) through a flushing water discharge pipe (9) and discharges flushing water to the pretreatment tank (1).

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