Sewage sedimentation tank of concrete mixing station and sewage treatment method

Abstract

The invention discloses a sewage sedimentation tank for a concrete mixing station, which comprises a first-stage sedimentation tank, a second-stage sedimentation tank, a third-stage sedimentation tank and a fourth-stage sedimentation tank which are arranged step by step, the first-stage sedimentation tank is communicated with the second-stage sedimentation tank through an overflow port, and the third-stage sedimentation tank is communicated with the fourth-stage sedimentation tank through an overflow port; the bottom wall of the primary sedimentation tank is a slope ramp, and an overflow port between the primary sedimentation tank and the secondary sedimentation tank is positioned at the top end of the slope ramp; a first stirring device is arranged on the secondary sedimentation tank, a filter press is arranged on one side of the secondary sedimentation tank, the filter press is communicated with the secondary sedimentation tank through a water suction pipe and a water return pipe, and a flocculant adding structure is arranged on the secondary sedimentation tank; a second stirring device is arranged on the third-stage sedimentation tank; and the second-stage sedimentation tank, the third-stage sedimentation tank and the fourth-stage sedimentation tank are all of polygonal structures. According to the invention, the cleaning frequency of the sedimentation tank can be reduced, the water quality index is improved, the treatment is compliant, and the to-be-discharged sewage can be discharged or used for site cleaning or road dust falling.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and more specifically to a sewage sedimentation tank of a concrete mixing station and a sewage treatment method. Background Art

[0002] The treatment of wastewater produced by concrete mixing plants still follows the working principle of the original sewage sedimentation tank. The sedimentation tank is set up in three levels, and the sewage is precipitated step by step from dirty to turbid to clear. The sedimentation is relatively slow, and the sedimentation tank is easily filled with sediment, and there are low sedimentation efficiency. In order to improve the working efficiency of the sedimentation tank, give full play to the functional effect of the sedimentation tank, and effectively solve the reasonable discharge of sewage sedimentation, it is necessary to develop a sewage sedimentation tank for concrete mixing plants. Summary of the invention

[0003] The purpose of the present invention is to provide a sewage sedimentation tank and sewage treatment method for a concrete mixing station. In order to facilitate the timely cleaning of sediment, a first-level slope sedimentation tank is set up. The sewage clarified by the first-level sedimentation tank overflows to the second-level sedimentation tank step by step for stirring to prevent the precipitation of silt materials; in order to facilitate the timely treatment of sediment in the sedimentation tank, a filter press is set on one side of the second-level sedimentation tank. The turbid sewage in the second-level sedimentation tank is pumped into the filter press after sufficient stirring, and the filter press performs filter pressing and molding on plastic debris; after the filter pressing treatment of the debris, the sewage that no longer contains debris flows into the second-level sedimentation tank. In order to make the sewage precipitate quickly, a flocculant is added to the second-level tank, and the clarified water flows into the third and fourth-level sedimentation tanks respectively. The advantages of this structural setting are: there is no debris at the bottom of the pool, the frequency of cleaning the sedimentation tank is reduced, the water quality index is improved, the treatment is compliant, and the sewage to be discharged can be discharged or used for site cleaning or road dust reduction.

[0004] In order to achieve these purposes and other advantages of the present invention, a sewage sedimentation tank for a concrete mixing station is provided, comprising a primary sedimentation tank, a secondary sedimentation tank, a tertiary sedimentation tank and a quaternary sedimentation tank which are arranged in stages, the primary sedimentation tank is connected to the secondary sedimentation tank through an overflow port, and the tertiary sedimentation tank is connected to the quaternary sedimentation tank through an overflow port; the bottom wall of the primary sedimentation tank is a ramp, and the overflow port between the primary sedimentation tank and the secondary sedimentation tank is located at the top of the ramp; a first stirring device is arranged on the secondary sedimentation tank, a filter press is arranged on one side of the secondary sedimentation tank, the filter press is connected to the secondary sedimentation tank through a suction pipe and a return pipe, and a flocculant adding structure is arranged on the secondary sedimentation tank; a second stirring device is arranged on the tertiary sedimentation tank; the secondary sedimentation tank, the tertiary sedimentation tank and the quaternary sedimentation tank are all polygonal structures.

[0005] Preferably, in the sewage sedimentation tank of the concrete mixing station, the secondary sedimentation tank and the tertiary sedimentation tank are both octagonal prism-shaped, and the quaternary sedimentation tank is a rectangular parallelepiped structure.

[0006] Preferably, in the sewage sedimentation tank of the concrete mixing station, the secondary sedimentation tank is connected to the tertiary sedimentation tank through an overflow port.

[0007] Preferably, in the sewage sedimentation tank of the concrete mixing station, each overflow outlet is S-shaped.

[0008] Preferably, in the sewage sedimentation tank of the concrete mixing station, an annular first baffle and an annular second baffle are provided in the secondary sedimentation tank, the first baffle and the second baffle are both vertically arranged, and their bottoms are both located at the lower part of the secondary sedimentation tank, and are fixedly connected to the inclined side walls, and the tops are both separated from the secondary sedimentation tank by a certain distance, the second baffle is located outside the first baffle, and a rotating downward channel is provided between the second baffle and the first baffle, the height of the top of the first baffle is higher than the height of the top of the second baffle, the lower part of the first baffle is provided with a first inlet and a second inlet, a second stirring zone is formed between the side wall of the second baffle and the side wall of the secondary sedimentation tank, and the first stirring device includes a driving device, a stirring shaft, a plurality of first stirring blades and at least one second stirring blade The blades are connected to the stirring shaft by a driving device. The stirring shaft, except for its top, is located in the first baffle. The first stirring zone is formed inside the first baffle. Each first stirring blade is fixed on the stirring shaft. One end of each second stirring blade is fixed on the stirring shaft, and the other end passes through the area between the top of the first baffle and the second baffle and the secondary sedimentation tank, and extends downward to the second stirring zone. The overflow port connecting the primary sedimentation tank and the secondary sedimentation tank is connected to the first inlet, and the bottom of the channel is connected to the second inlet. The water suction pipe is connected to the first stirring zone and does not interfere with the rotation of the stirring shaft and the first stirring blade. The return pipe is selectively connected to the second stirring zone or the tertiary sedimentation tank without affecting the rotation of the second stirring blade. The flocculant outlet of the flocculant addition structure is connected to or relative to the second stirring zone.

[0009] Preferably, in the sewage sedimentation tank of the concrete mixing station, the second stirring blade has multiple blades, the driving device drives a driving gear to rotate, the top of the stirring shaft is provided with a driven gear meshing with the driving gear, the top of the stirring shaft and the upper part of the second stirring blade are both hollow inside and connected to each other, the top of the stirring shaft forms a flocculant inlet, the upper part of the second stirring blade is provided with a flocculant outlet, and the flocculant outlet is opposite to the second stirring zone.

[0010] Preferably, in the sewage sedimentation tank of the concrete mixing station, a water quality concentration monitor is provided in the second mixing zone;

[0011] The sewage sedimentation tank of the concrete mixing station also includes:

[0012] A water pump, which is connected to the second stirring zone and the filter press through a water suction pipe and a water delivery pipe respectively;

[0013] A controller is connected to the water quality concentration monitor and the water pump.

[0014] Preferably, in the sewage sedimentation tank of the concrete mixing plant, the height of the portion of the top of the second partition plate opposite to the top of the channel is lower than the height of other portions of the second partition plate.

[0015] Preferably, in the sewage sedimentation tank of the concrete mixing station, the first inlet and the second inlet are both arranged at the bottom of the first partition.

[0016] The sewage treatment method using the sewage sedimentation tank of the concrete mixing plant includes the following steps:

[0017] The sewage after sedimentation in the primary sedimentation tank flows into the first stirring zone through the overflow port between the primary sedimentation tank and the secondary sedimentation tank, and after being stirred by the first stirring blade, it is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage flows into the second stirring zone through the return pipe; the water quality concentration monitor monitors the water quality concentration in the second stirring zone in real time, and when the preset concentration is reached, the controller controls the water pump to start, and pumps the sewage in the second stirring zone into the filter press through the suction pipe for pressure filtration, and then the sewage flows into the second stirring zone through the return pipe;

[0018] Add flocculant into the second stirring zone through the flocculant inlet at the top of the stirring shaft, mix the flocculant with the sewage after stirring by the second stirring blade, and then overflow into the channel between the second partition plate and the first partition plate, and flow from top to bottom. In this process, particles with flocculation properties in the water gather in mutual collision to form larger floccules, and then enter the first stirring zone through the second inlet. After stirring by the first stirring blade, the flocculant is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage enters the tertiary sedimentation tank through the return pipe;

[0019] After being stirred by the second stirring device, the sewage flows into the fourth sedimentation tank through the overflow port between the third sedimentation tank and the fourth sedimentation tank for treatment.

[0020] The present invention has at least the following beneficial effects:

[0021] The present invention sets a first-level slope sedimentation tank for the convenience of timely cleaning of sediment. The sewage clarified by the first-level sedimentation tank overflows to the second-level sedimentation tank step by step for stirring to prevent the precipitation of silt. To facilitate the timely treatment of sediment in the sedimentation tank, a filter press is set on one side of the second-level sedimentation tank. The turbid sewage in the second-level sedimentation tank is pumped into the filter press after sufficient stirring, and the filter press performs filter pressing to shape the plastic debris. After the debris is filtered, the sewage no longer contains debris and flows into the second-level sedimentation tank. In order to make the sewage precipitate quickly, a flocculant is added to the second-level sedimentation tank, and the clarified water flows into the third and fourth-level sedimentation tanks respectively. The advantages of this structural setting are: there is no debris at the bottom of the pool, the frequency of cleaning the sedimentation tank is reduced, the water quality index is improved, the treatment is compliant, and the sewage to be discharged can be discharged or used for site cleaning or road dust reduction.

[0022] The secondary sedimentation tank of the present invention is equipped with a filter press, a first stirring device, a water quality concentration monitor, and a self-priming sewage pump. The sewage treated in the primary sedimentation tank first enters the first stirring zone for stirring to prevent the precipitation of silt materials, and is then pumped into the filter press after being fully stirred, and the filter press performs filter pressing and molding on plastic impurities; after the impurities are filtered and processed, the sewage no longer contains impurities and then flows into the second stirring zone. In order to quickly precipitate the sewage, a flocculant is added to the second stirring zone, and after being stirred by a second stirring blade, the flocculant and the sewage are mixed, and then overflow into the channel between the second partition plate and the first partition plate, and flow from top to bottom. In this process, particles with flocculation performance in the water gather in mutual collision, form larger floccules, and then enter the first stirring zone through the second inlet, and after being stirred by the first stirring blade, the sewage is pumped into the filter press through a water suction pipe for filter pressing, and then the sewage enters the tertiary sedimentation tank through a return pipe; the sewage is stirred, repeatedly filtered and flocculated in the secondary sedimentation tank, and the treatment efficiency of the secondary sedimentation tank can be improved.

[0023] The present invention adds flocculant through the top of the stirring shaft, and the flocculant enters the second stirring zone through the flocculant outlet on the second stirring blade. Since the second stirring blade can rotate with the stirring shaft, the flocculant can evenly enter the second stirring zone during the rotation process, and after entering the second stirring zone, the flocculant is stirred through the lower part of the second stirring blade, so that the flocculant and the sewage in the second stirring zone are evenly mixed, which is beneficial to improving flocculation efficiency.

[0024] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a sedimentation tank according to an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the structure of a secondary sedimentation tank according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] like Figure 1 As shown, the present invention provides a sewage sedimentation tank for a concrete mixing station, comprising a primary sedimentation tank 1, a secondary sedimentation tank 2, a tertiary sedimentation tank 3 and a quaternary sedimentation tank 4 which are arranged in stages, the primary sedimentation tank 1 is connected to the secondary sedimentation tank 2 through an overflow port, and the tertiary sedimentation tank 3 is connected to the quaternary sedimentation tank 4 through an overflow port; the bottom wall of the primary sedimentation tank 1 is a ramp, and the overflow port between the primary sedimentation tank 1 and the secondary sedimentation tank 2 is located at the top of the ramp; a first stirring device 5 is arranged on the secondary sedimentation tank 2, a filter press is arranged on one side of the secondary sedimentation tank 2, the filter press is connected to the secondary sedimentation tank 2 through a suction pipe and a return pipe, and a flocculant adding structure is arranged on the secondary sedimentation tank 2; a second stirring device is arranged on the tertiary sedimentation tank 3; the secondary sedimentation tank 2, the tertiary sedimentation tank 3 and the quaternary sedimentation tank 4 are all polygonal structures.

[0030] The present invention sets a first-level slope sedimentation tank for the convenience of timely cleaning of sediment. The sewage clarified by the first-level sedimentation tank 1 overflows to the second-level sedimentation tank 2 step by step for stirring to prevent the precipitation of silt. To facilitate the timely treatment of sediment in the sedimentation tank, a filter press is set on one side of the second-level sedimentation tank 2. The turbid sewage in the second-level sedimentation tank 2 is pumped into the filter press after sufficient stirring, and the filter press performs filter pressing to shape the plastic debris. After the debris is filtered, the sewage that no longer contains debris flows into the second-level sedimentation tank 2. In order to make the sewage precipitate quickly, a flocculant is added to the second-level sedimentation tank 2, and the clarified water flows into the third and fourth sedimentation tanks respectively. The advantages of this structural setting are: there is no debris at the bottom of the pool, the frequency of cleaning the sedimentation tank is reduced, the water quality index is improved, the treatment is compliant, and the sewage to be discharged can be discharged or used for site cleaning or road dust reduction.

[0031] The main sources of wastewater produced by the mixing plant are mechanical cleaning and sand and gravel separation. Sand and gravel separation is achieved by reversing the vehicle onto the reversing platform, aligning the tanker unloading chute with the separator, turning on the separator and turning on the tanker unloading switch at the same time to separate the sand and gravel, and the sewage slurry flows into the primary sedimentation tank 1. The debris precipitated in the primary sedimentation tank 1 is cleaned by the loader, and the sewage in the tank flows into the secondary sedimentation tank 2 through the overflow port. After sedimentation, the sewage flows into the third and fourth sedimentation tanks respectively. The clarified water source that meets the standards is used for cleaning the site or dust reduction, and the sediment is excavated and cleaned in stages.

[0032] Beneficial effects:

[0033] 1. The sedimentation tank system is equipped with a sand and gravel separator. Beneficial effects: Separate and utilize the remaining concrete in the tank truck, and recycle and reuse the resources.

[0034] 2. A mud and debris mixer is installed along the mouth of the secondary sedimentation tank 2. Beneficial effect: Sewage debris and mud are filtered and formed by the filter press to remove debris in the water.

[0035] 3. The first-level sedimentation tank 1 is designed as a slope type, which is convenient for using a loader to clean up the sediment. Beneficial effects: reduce labor intensity, save manual cleaning time, and improve work efficiency.

[0036] 4. The secondary sedimentation tank 2 is equipped with a stirring device to facilitate the precipitation of high-density particles. Beneficial effect: high-density particles are formed by stirring and filtering, and the treated sewage overflows into the next sedimentation tank, reducing the frequency of equipment cleaning and reducing cost investment.

[0037] 5. The second, third and fourth stage sedimentation tanks are designed as polygonal structures. Beneficial effects: vortexes are easily formed during the stirring process, which is conducive to the mixing of sediment and sewage and the cleaning of light suspended matter on its surface.

[0038] This technical solution has been promoted and used in railway, expressway and highway reconstruction and expansion projects under construction.

[0039] 1. For the rectangular sedimentation tanks used previously, the first-level sedimentation tank 1 has a small capacity, and the sediment cleaning is difficult, the cleaning frequency is high, and the cost investment is large. This application innovatively changes the structural design of each level of the sedimentation tank, sets a slope for the first-level tank to facilitate cleaning, and configures polygonal second, third, and fourth-level sedimentation tanks, which are conducive to overflow to form a vortex and facilitate the cleaning of suspended light materials.

[0040] 2. Through on-site verification, it was found that the original rectangular sedimentation tank design was not installed with a stirring device. Comparing the two, the latter is easy to clean the sediment, has high work efficiency, and has a good sewage sedimentation effect.

[0041] In the sewage sedimentation tank of the concrete mixing station, the secondary sedimentation tank 2 and the tertiary sedimentation tank 3 are both octagonal prism-shaped, and the quaternary sedimentation tank 4 is a rectangular parallelepiped structure.

[0042] In the sewage sedimentation tank of the concrete mixing station, the secondary sedimentation tank 2 is connected to the tertiary sedimentation tank 3 through an overflow port.

[0043] In the sewage sedimentation tank of the concrete mixing station, each overflow port is S-shaped, which can prevent the sediment from directly overflowing into the next level.

[0044] In the sewage sedimentation tank of the concrete mixing station, Figure 2 As shown, the secondary sedimentation tank 2 is provided with an annular first baffle 21 and an annular second baffle 22, the first baffle 21 and the second baffle 22 are both vertically arranged, and their bottoms are both located at the lower part of the secondary sedimentation tank 2, and are fixedly connected to the inclined side walls, and the tops are both separated from the secondary sedimentation tank 2 by a certain distance, the second baffle 22 is located outside the first baffle 21, and a rotating downward channel is provided between the second baffle 22 and the first baffle 21, the height of the top of the first baffle 21 is higher than the height of the top of the second baffle 22, so that the sewage in the second stirring zone can only overflow between the first baffle 21 and the second baffle 22, and cannot flow directly into the first baffle 21, the lower part of the first baffle 21 is provided with a first inlet 211 and a second inlet 212, and a second stirring zone is formed between the side wall of the second baffle 22 and the side wall of the secondary sedimentation tank 2, and the first stirring device 5 includes a driving device, a stirring shaft, a plurality of first stirring blades 51 and at least one second stirring blade 52, the driving device is connected to the stirring shaft, and the stirring shaft, except for its top, is located in the first partition 21. The first partition 21 forms a first stirring zone inside. Each first stirring blade 51 is fixed on the stirring shaft, and one end of each second stirring blade 52 is fixed on the stirring shaft, and the other end passes through the area between the top of the first partition 21 and the second partition 22 and the secondary sedimentation tank 2, and extends downward to the second stirring zone, so that the first partition 21 and the second partition 22 do not affect the rotation of the second stirring blade 52, the overflow port connecting the primary sedimentation tank 1 and the secondary sedimentation tank 2 is connected to the first inlet 211 through a downwardly inclined water pipe, and the bottom of the channel is connected to the second inlet 212, the water suction pipe is connected to the first stirring zone, and does not interfere with the rotation of the stirring shaft and the first stirring blade 51, the return pipe is selectively connected to the second stirring zone or the tertiary sedimentation tank 3, and does not affect the rotation of the second stirring blade 52, and the flocculant outlet 54 of the flocculant addition structure is connected to or relative to the second stirring zone.

[0045] The sewage treatment method using the sewage sedimentation tank of the concrete mixing plant includes the following steps:

[0046] The sewage after sedimentation in the primary sedimentation tank 1 flows into the first stirring zone through the overflow port between the primary sedimentation tank 1 and the secondary sedimentation tank 2, and after being stirred by the first stirring blade 51, it is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage flows into the second stirring zone through the return pipe;

[0047] Add flocculant to the second stirring zone, stir with the second stirring blade 52, mix the flocculant with the sewage, and then overflow to the channel between the second partition plate 22 and the first partition plate 21, and flow from top to bottom. In this process, particles with flocculation properties in the water gather in mutual collision to form larger floccules, and then enter the first stirring zone through the second inlet 212. After being stirred by the first stirring blade 51, the flocculant is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage enters the tertiary sedimentation tank 3 through the return pipe;

[0048] After being stirred by the second stirring device, the sewage flows through the overflow port between the tertiary sedimentation tank 3 and the quaternary sedimentation tank 4 to the quaternary sedimentation tank 4 for treatment.

[0049] In the sewage sedimentation tank of the concrete mixing station, the second stirring blade 52 has multiple blades, the driving device drives a driving gear to rotate, and the top of the stirring shaft is provided with a driven gear meshing with the driving gear. The top of the stirring shaft and the upper part of the second stirring blade 52 are both hollow inside and connected to each other. The top of the stirring shaft forms a flocculant inlet 53, and the upper part of the second stirring blade 52 is provided with a flocculant outlet 54, and the flocculant outlet 54 is opposite to the second stirring zone.

[0050] The sewage treatment method using the sewage sedimentation tank of the concrete mixing plant includes the following steps:

[0051] The sewage after sedimentation in the primary sedimentation tank 1 flows into the first stirring zone through the overflow port between the primary sedimentation tank 1 and the secondary sedimentation tank 2, and after being stirred by the first stirring blade 51, it is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage flows into the second stirring zone through the return pipe;

[0052] A flocculant is added to the second stirring zone through the flocculant inlet 53 at the top of the stirring shaft. After being stirred by the second stirring blade 52, the flocculant is mixed with the sewage, and then overflows into the channel between the second partition plate 22 and the first partition plate 21, and flows from top to bottom. In this process, particles with flocculation properties in the water gather in mutual collision to form larger floccules, and then enter the first stirring zone through the second inlet 212. After being stirred by the first stirring blade 51, the flocculant is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage enters the tertiary sedimentation tank 3 through the return pipe;

[0053] After being stirred by the second stirring device, the sewage flows through the overflow port between the tertiary sedimentation tank 3 and the quaternary sedimentation tank 4 to the quaternary sedimentation tank 4 for treatment.

[0054] In the present invention, flocculant is added through the top of the stirring shaft, and the flocculant enters the second stirring zone through the flocculant outlet 54 on the second stirring blade 52. Since the second stirring blade 52 can rotate with the stirring shaft, the flocculant can evenly enter the second stirring zone during the rotation process. After entering the second stirring zone, the flocculant is stirred through the lower part of the second stirring blade 52, so that the flocculant and the sewage in the second stirring zone are evenly mixed, which is beneficial to improving flocculation efficiency.

[0055] In the sewage sedimentation tank of the concrete mixing station, a water quality concentration monitor is provided in the second mixing zone;

[0056] The sewage sedimentation tank of the concrete mixing station also includes:

[0057] A water pump, which is connected to the second stirring zone and the filter press through a water suction pipe and a water delivery pipe respectively, and the water suction pipe and the water delivery pipe do not affect the rotation of the second stirring blade;

[0058] A controller is connected to the water quality concentration monitor and the water pump.

[0059] The water quality concentration monitor monitors the water quality concentration in the second stirring zone in real time. When the preset concentration is reached, the controller controls the water pump to start up and pumps the sewage in the second stirring zone into the filter press through the suction pipe for pressure filtration. After that, the sewage flows into the second stirring zone through the return pipe.

[0060] In the sewage sedimentation tank of the concrete mixing plant, the height of the portion of the top of the second partition 22 opposite to the top of the channel is lower than the height of the other portions of the second partition 22. In this way, the sewage in the second mixing zone can flow to the top of the channel through the portion of the top of the second partition 22 opposite to the top of the channel, and then flow from top to bottom.

[0061] In the sewage sedimentation tank of the concrete mixing station, the first inlet 211 and the second inlet 212 are both arranged at the bottom of the first partition 21, so that all the sewage in the second mixing zone and the channel can be introduced into the first mixing zone.

[0062] The sewage treatment method using the sewage sedimentation tank of the concrete mixing plant includes the following steps:

[0063] The sewage after sedimentation in the primary sedimentation tank 1 flows into the first stirring zone through the overflow port between the primary sedimentation tank 1 and the secondary sedimentation tank 2, and after being stirred by the first stirring blade 51, it is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage flows into the second stirring zone through the return pipe; the water quality concentration monitor monitors the water quality concentration in the second stirring zone in real time, and when the preset concentration is reached, the controller controls the water pump to start, and pumps the sewage in the second stirring zone into the filter press through the suction pipe for pressure filtration, and then the sewage flows into the second stirring zone through the return pipe;

[0064] A flocculant is added to the second stirring zone through the flocculant inlet 53 at the top of the stirring shaft. After being stirred by the second stirring blade 52, the flocculant is mixed with the sewage, and then overflows into the channel between the second partition plate 22 and the first partition plate 21, and flows from top to bottom. In this process, particles with flocculation properties in the water gather in mutual collision to form larger floccules, and then enter the first stirring zone through the second inlet 212. After being stirred by the first stirring blade 51, the flocculant is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage enters the tertiary sedimentation tank 3 through the return pipe;

[0065] After being stirred by the second stirring device, the sewage flows through the overflow port between the tertiary sedimentation tank 3 and the quaternary sedimentation tank 4 to the quaternary sedimentation tank 4 for treatment.

[0066] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A sewage sedimentation tank of a concrete mixing station, comprising a primary sedimentation tank, a secondary sedimentation tank, a tertiary sedimentation tank and a quaternary sedimentation tank arranged in stages, wherein the primary sedimentation tank is connected to the secondary sedimentation tank through an overflow port, and the tertiary sedimentation tank is connected to the quaternary sedimentation tank through an overflow port; characterized in that: The bottom wall of the primary sedimentation tank is a ramp, and the overflow port between the primary sedimentation tank and the secondary sedimentation tank is located at the top of the ramp; a first stirring device is provided on the secondary sedimentation tank, and a filter press is provided on one side of the secondary sedimentation tank. The filter press is connected to the secondary sedimentation tank through a suction pipe and a return pipe, and a flocculant adding structure is provided on the secondary sedimentation tank; a second stirring device is provided on the tertiary sedimentation tank; the secondary sedimentation tank, the tertiary sedimentation tank and the quaternary sedimentation tank are all polygonal structures.

2. The sewage sedimentation tank of a concrete mixing station as claimed in claim 1, characterized in that: The secondary and tertiary sedimentation tanks are both octagonal prisms, and the fourth-stage sedimentation tank is a rectangular structure.

3. The sewage sedimentation tank of a concrete mixing station as claimed in claim 1, characterized in that: The secondary sedimentation tank is connected to the tertiary sedimentation tank through an overflow port.

4. The sewage sedimentation tank of a concrete mixing station as claimed in claim 3, characterized in that: Each overflow port is S-shaped.

5. The sewage sedimentation tank of a concrete mixing station as claimed in claim 2, characterized in that: The secondary sedimentation tank is provided with an annular first partition and an annular second partition, the first partition and the second partition are both vertically arranged, and the bottoms thereof are both located at the lower part of the secondary sedimentation tank, and are fixedly connected to the inclined side walls, and the tops are both separated from the secondary sedimentation tank by a certain distance, the second partition is located outside the first partition, a rotating downward channel is provided between the second partition and the first partition, the height of the top of the first partition is higher than the height of the top of the second partition, the lower part of the first partition is provided with a first inlet and a second inlet, a second stirring zone is formed between the side wall of the second partition and the side wall of the secondary sedimentation tank, the first stirring device comprises a driving device, a stirring shaft, a plurality of first stirring blades and at least one second stirring blade, the driving device and the stirring shaft The stirring shaft is connected, except for its top, the other parts are located in the first baffle, the first baffle forms a first stirring zone inside, each first stirring blade is fixed on the stirring shaft, one end of each second stirring blade is fixed on the stirring shaft, and the other end passes through the area between the top of the first baffle and the second baffle and the secondary sedimentation tank, and extends downward to the second stirring zone, the overflow port connecting the primary sedimentation tank and the secondary sedimentation tank is connected to the first inlet, the bottom of the channel is connected to the second inlet, the water suction pipe is connected to the first stirring zone and does not interfere with the rotation of the stirring shaft and the first stirring blade, the return pipe is selectively connected to the second stirring zone or the tertiary sedimentation tank and does not affect the rotation of the second stirring blade, and the flocculant outlet of the flocculant addition structure is connected to or relative to the second stirring zone.

6. The sewage sedimentation tank of a concrete mixing station as claimed in claim 5, characterized in that: The second stirring blade has multiple blades, the driving device drives a driving gear to rotate, the top of the stirring shaft is provided with a driven gear meshing with the driving gear, the top of the stirring shaft and the upper part of the second stirring blade are both hollow inside and connected to each other, the top of the stirring shaft forms a flocculant inlet, the upper part of the second stirring blade is provided with a flocculant outlet, and the flocculant outlet is opposite to the second stirring zone.

7. The sewage sedimentation tank of a concrete mixing station as claimed in claim 6, characterized in that: A water quality concentration monitor is provided in the second stirring zone; The sewage sedimentation tank of the concrete mixing station also includes: A water pump, which is connected to the second stirring zone and the filter press through a water suction pipe and a water delivery pipe respectively; A controller is connected to the water quality concentration monitor and the water pump.

8. The sewage sedimentation tank of a concrete mixing station as claimed in claim 7, characterized in that: A portion of the top of the second separator that is opposite to the top of the channel has a height lower than that of other portions of the second separator.

9. The sewage sedimentation tank of a concrete mixing station as claimed in claim 5, characterized in that: The first inlet and the second inlet are both disposed at the bottom of the first partition plate.

10. The sewage treatment method using the sewage sedimentation tank of a concrete mixing plant as claimed in claim 8 is characterized in that: The following steps are involved: The sewage after sedimentation in the primary sedimentation tank flows into the first stirring zone through the overflow port between the primary sedimentation tank and the secondary sedimentation tank, and after being stirred by the first stirring blade, it is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage flows into the second stirring zone through the return pipe; the water quality concentration monitor monitors the water quality concentration in the second stirring zone in real time, and when the preset concentration is reached, the controller controls the water pump to start, and pumps the sewage in the second stirring zone into the filter press through the suction pipe for pressure filtration, and then the sewage flows into the second stirring zone through the return pipe; Add flocculant into the second stirring zone through the flocculant inlet at the top of the stirring shaft, mix the flocculant with the sewage after stirring by the second stirring blade, and then overflow into the channel between the second partition plate and the first partition plate, and flow from top to bottom. In this process, particles with flocculation properties in the water gather in mutual collision to form larger floccules, and then enter the first stirring zone through the second inlet. After stirring by the first stirring blade, the flocculant is pumped into the filter press through the suction pipe for pressure filtration, and then the sewage enters the tertiary sedimentation tank through the return pipe; After being stirred by the second stirring device, the sewage flows into the fourth sedimentation tank through the overflow port between the third sedimentation tank and the fourth sedimentation tank for treatment.

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