Recycling device for production wastewater of concrete mixing plant and operation method of recycling device

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a recycling device for production wastewater of a concrete mixing plant and an operation method of the recycling device. Comprising a first-stage barrel, a second-stage barrel is communicated with the first-stage barrel in a penetrating mode, the separation and mixing mechanism is arranged in the first-stage barrel and the second-stage barrel, and the separation and mixing mechanism comprises a conical cover fixedly installed in the second-stage barrel and a centrifugal plate arranged on the lower side of the conical cover and driven by a motor. By arranging the separating and mixing mechanism, after waste water containing sandstone aggregate is put into a secondary barrel, a centrifugal plate rotates at a high speed, the waste water containing the sandstone aggregate can be thrown to a filter barrel, the waste water and the sandstone aggregate can be rapidly separated, when the waste water flows to a first impeller, the waste water is thrown out through high-speed rotation of the first impeller, and the waste water is recycled. And the flocculating agent is sprayed out by matching with the spray pipe, so that the flocculating agent can be uniformly mixed into the wastewater, and uniform mixing of the flocculating agent and the wastewater can be realized without stirring the wastewater by stirring equipment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a device for recycling and utilizing wastewater from a concrete mixing plant and its operating method. Background Technology

[0002] After completing a production task or before starting the next batch of concrete of a different type, the existing mixer must be immediately rinsed with clean water to avoid residual concrete from contaminating the mixer and adversely affecting the performance of the next batch of concrete of a different type. A large amount of wastewater will be generated when rinsing the mixer. The wastewater can be reused after treatment.

[0003] Currently, the wastewater generated by concrete mixing plants during equipment cleaning typically contains a large amount of suspended solids, colloids, and sand and gravel aggregates. Treatment often involves solid-liquid separation using sedimentation tanks or filter presses, followed by flocculation and sedimentation with the addition of flocculants. The flocculants usually need to be thoroughly mixed with the wastewater through mechanical stirring or aeration to achieve the desired treatment effect. However, existing wastewater treatment devices suffer from problems such as complex equipment, large footprint, high energy consumption, and uneven flocculant mixing. Furthermore, it is difficult to control the flocculant dosage based on changes in wastewater volume, resulting in resource waste and unstable treatment effects.

[0004] Therefore, there is an urgent need for a wastewater treatment device that integrates solid-liquid separation and flocculation mixing, has a compact structure, low energy consumption, and can automatically adjust the amount of flocculant added. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a device for recycling and utilizing wastewater from a concrete mixing plant and its operation method.

[0006] The technical solution of the present invention is as follows: a device for recycling wastewater from a concrete mixing plant, comprising a primary tank, a secondary tank being connected through the primary tank, and a separation and mixing mechanism disposed within the primary and secondary tanks. The separation and mixing mechanism includes a conical cover fixedly installed within the secondary tank, and a centrifugal plate disposed below the conical cover and driven by a motor. A filter tank for filtering sand and gravel aggregates in the wastewater is fixedly connected within the secondary tank. A first impeller for uniformly distributing the wastewater is fixedly connected to the centrifugal plate. A spray pipe for spraying flocculant is fixedly connected through the primary tank, and the spray pipe is equipped with an adjustment mechanism for adjusting the amount of flocculant sprayed according to the wastewater volume.

[0007] As a preferred embodiment of the present invention, the separation and mixing mechanism further includes two speed-reducing plates fixedly installed inside the filter barrel.

[0008] As a preferred embodiment of the present invention, the adjustment mechanism includes an input pipe that is fixedly inserted through the primary barrel and communicates with the nozzle, and an adjustment plate is slidably connected through the input pipe.

[0009] As a preferred embodiment of the present invention, the adjustment mechanism further includes an adjustment frame that is slidably mounted on the primary bucket, wherein a tension spring is provided between the adjustment frame and the primary bucket, and a connecting rod is provided between the adjustment frame and the adjustment plate.

[0010] As a preferred embodiment of the present invention, the filter barrel contains two swing rods hinged together by a pair of support plates. A torsion spring is provided between the swing rods and the support plates, and a striking post for striking the filter barrel is fixedly installed at the end of the swing rod.

[0011] As a preferred embodiment of the present invention, a pair of protruding shafts that cooperate with the rocker arm are fixedly installed on the first impeller.

[0012] As a preferred embodiment of the present invention, a discharge pipe is fixedly installed through the primary barrel, the first impeller is rotatably installed on the discharge pipe, a second impeller is rotatably fitted on the discharge pipe, and a plurality of first scrapers are fixedly connected to the second impeller and slidably connected to the inner wall of the primary barrel.

[0013] As a preferred embodiment of the present invention, a second scraper is fixedly connected to the first scraper and slidably connected to the inner wall of the primary barrel.

[0014] As a preferred embodiment of the present invention, the second impeller, under the action of wastewater flow, enables the first scraper and the second scraper to move and clean the inner wall of the primary tank.

[0015] As a preferred embodiment of the present invention, an operation method for a device for recycling and utilizing wastewater from a concrete mixing plant includes the following steps: S1: Wastewater is put into the secondary tank, and the output shaft of the motor is controlled to rotate, so that the centrifugal plate throws the wastewater containing sand and gravel aggregates into the filter tank to achieve solid-liquid separation; S2: The regulating mechanism automatically adjusts the dosage of flocculant sprayed from the nozzle according to the amount of wastewater input. When the first impeller throws the wastewater onto the inner wall of the first-stage tank, the flocculant is evenly mixed into the wastewater. S3: When the wastewater is discharged, the second impeller drives several of the first scrapers to move under the action of the wastewater flow. The first scrapers drive the second scrapers to clean the inner wall of the first-stage tank.

[0016] The beneficial effects of this invention are: 1. This invention, by setting up a separation and mixing mechanism, allows wastewater containing sand and gravel aggregates to be put into a secondary tank. The high-speed rotation of the centrifugal plate throws the wastewater containing sand and gravel aggregates into the filter tank, quickly separating the wastewater from the sand and gravel aggregates. When the wastewater flows to the first impeller, the high-speed rotation of the first impeller throws the wastewater out, and the flocculant is sprayed out with the spray pipe, which can make the flocculant evenly mixed into the wastewater. The flocculant and wastewater can be evenly mixed without the need for stirring equipment.

[0017] 2. By setting an adjustment mechanism, the present invention can automatically adjust the amount of flocculant added according to the amount of wastewater, preventing the waste of flocculant while ensuring that a sufficient amount of flocculant is sprayed into the wastewater. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the separation and mixing mechanism of the present invention; Figure 3 This is a schematic diagram of the installation of the speed reduction plate of the present invention; Figure 4 This is a schematic diagram of the installation at the input tube of the present invention; Figure 5 This is a schematic diagram of the installation of the adjustment frame of the present invention; Figure 6 This is a schematic diagram of the installation of the striking post in this invention; Figure 7 This is a schematic diagram of the installation of the swing arm in this invention; Figure 8 This is a schematic diagram of the installation at the second impeller of the present invention; Figure 9 This is a schematic diagram of the structure of the second scraper of the present invention.

[0019] The markings in the diagram are as follows: 1-First stage tank, 101-Second stage tank, 201-Conical cover, 202-Motor, 203-Centrifuge plate, 204-Filter tank, 205-First impeller, 206-Spray nozzle, 301-Speed ​​reduction plate, 401-Input pipe, 402-Adjusting plate, 501-Adjusting frame, 502-Connecting rod, 601-Swing rod, 602-Striking column, 701-Protruding shaft, 801-Discharge pipe, 802-Second impeller, 803-First scraper, 901-Second scraper, 100-Water level gauge, 200-Butterfly valve. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection and application of the present invention. Example

[0021] A device for recycling wastewater from a concrete mixing plant, such as... Figures 1-8 As shown, the system includes a primary tank 1, with a secondary tank 101 penetrating through the top of the primary tank 1. It also includes a separation and mixing mechanism disposed within the primary tank 1 and the secondary tank 101. The separation and mixing mechanism includes a conical cover 201 fixedly installed on the upper part of the inner wall of the secondary tank 101, and a centrifugal plate 203 disposed on the lower side of the conical cover 201 and driven by a motor 202. The motor 202 is installed at the bottom of the conical cover 201. A filter tank 204 for filtering sand and gravel aggregates in wastewater is fixedly connected inside the secondary tank 101. A first impeller 205 for uniformly distributing wastewater is fixedly connected to the bottom of the centrifugal plate 203. A spray pipe 206 for spraying flocculant is penetrating through the primary tank 1. The spray pipe 206 is provided with an adjustment mechanism for adjusting the amount of flocculant sprayed according to the amount of wastewater.

[0022] like Figure 3 As shown, the separation and mixing mechanism also includes two deceleration plates 301 fixedly installed inside the filter barrel 204. The deceleration plates 301 are used to reduce the falling speed of the sand and gravel aggregate, thereby extending the residence time of the sand and gravel aggregate in the action area of ​​the centrifugal plate 203, increasing the chance of being thrown multiple times, and improving the solid-liquid separation efficiency.

[0023] like Figure 4 and Figure 5 As shown, the regulating mechanism includes an input pipe 401 that is fixedly connected through the primary barrel 1 and communicates with the nozzle 206. An regulating plate 402 is slidably connected through the input pipe 401. When the regulating plate 402 moves up and down, it can regulate the flow rate of flocculant in the input pipe 401.

[0024] like Figure 5 As shown, the adjustment mechanism also includes an adjustment frame 501 that is slidably mounted on the primary barrel 1 in the left-right direction. A tension spring is provided between the adjustment frame 501 and the outer wall of the primary barrel 1, and a connecting rod 502 is provided between the adjustment frame 501 and the adjustment plate 402.

[0025] Initially, a gap is left between the regulating plate 402 and the inner wall of the input pipe 401. When the flocculant flows in the input pipe 401, the flocculant flow rate is at its minimum. First, wastewater containing sand and gravel aggregate is introduced into the secondary tank 101 through the top. The output shaft of the motor 202 is controlled to rotate, which drives the centrifugal plate 203 to rotate at high speed. The centrifugal plate 203 drives the first impeller 205 to rotate at high speed. At the same time, the flocculant is injected into the input pipe 401. The flocculant flows into the spray pipe 206 through the regulating plate 402. The wastewater containing sand and gravel aggregate falls onto the cone cover 201 and then falls along the surface of the cone cover 201 onto the upper deceleration plate 301. The wastewater containing sand and gravel aggregate falls onto the centrifugal plate 203 and is thrown against the inner wall of the filter tank 204 by the high-speed rotating centrifugal plate 203. The wastewater flows down the inner wall of the secondary tank 101 through the filter tank 204, while the sand and gravel aggregate is intercepted in the filter tank 204 and falls again onto the surface of the upper deceleration plate 301 and along the surface of the upper deceleration plate 301 until it contacts the centrifugal plate 203. The sand and gravel aggregate is then thrown onto the filter tank 204 by the centrifugal plate 203, or falls through the upper deceleration plate 301 to the surface of the lower deceleration plate 301 and moves along the surface of the lower deceleration plate 301 until it contacts the centrifugal plate 203. The wastewater from the aggregate is again thrown by the centrifuge plate 203 onto the filter tank 204. The centrifuge plate 203 repeatedly throws the sand and gravel aggregate into the filter tank 204, ensuring separation of the wastewater and aggregate and preventing the wastewater from falling too quickly together and failing to be effectively treated before discharge. The wastewater flows down the inner wall of the secondary tank 101 to the first impeller 205. The high-speed rotation of the first impeller 205 throws the wastewater against the inner wall of the primary tank 1. During this process, the spray nozzle 206 sprays flocculant, which is evenly mixed with the wastewater thrown by the first impeller 205. Some of the wastewater thrown by the first impeller 205 impacts the regulating frame 501. Because the rotation speed of the first impeller 205 is constant, the wastewater is... The ejection speed is stable, so the impact force on the regulating frame 501 mainly depends on the wastewater flow rate. That is, the greater the amount of wastewater input, the greater the impact force. Under the action of the impact force, the regulating frame 501 slides to the left due to the impact of the wastewater, and the tension spring is stretched by the force. The regulating frame 501 pushes the regulating plate 402 to slide upward through the connecting rod 502, which increases the gap between the regulating plate 402 and the input pipe 401, increases the flocculant flow rate in the input pipe 401, and thus increases the flocculant dosage sprayed from the nozzle 206. The greater the amount of wastewater input, the greater the flocculant dosage sprayed from the nozzle 206. In this way, the amount of flocculant sprayed can be adjusted according to the amount of wastewater, preventing the waste of flocculant while ensuring that a sufficient amount of flocculant is sprayed into the wastewater.

[0026] As a further supplement, the first impeller 205 sprays flocculant while throwing out wastewater, which can achieve uniform fusion of wastewater and flocculant. There is no need for stirring equipment to stir the wastewater, which reduces the overall size of the device and the cost of the device, while also reducing the energy consumption of wastewater treatment.

[0027] like Figure 6 and Figure 7 As shown, the bottom of the inner wall of the filter barrel 204 is hinged with two rocker arms 601 by a pair of support plates. A torsion spring is provided between the rocker arms 601 and the support plates. A striking post 602 for striking the filter barrel 204 is fixedly installed at the end of the rocker arms 601 near the filter barrel 204.

[0028] like Figure 6 and Figure 7 As shown, a pair of protruding shafts 701 that cooperate with the rocker arm 601 are fixedly installed on the top of the first impeller 205. When the first impeller 205 rotates, it can drive the protruding shafts 701 to squeeze the rocker arm 601, causing the rocker arm 601 to rotate.

[0029] During the high-speed rotation of the first impeller 205, the first impeller 205 drives the two protruding shafts 701 to move at high speed. Taking one of the protruding shafts 701 as an example, when the protruding shaft 701 moves to contact one of the rocker arms 601, the protruding shaft 701 squeezes the rocker arm 601, the rocker arm 601 rotates under force and drives the striking column 602 to move. The torsion spring stores energy under force. Then the protruding shaft 701 passes the rocker arm 601, the torsion spring is released and drives the rocker arm 601 to rotate quickly and reset. The rocker arm 601 drives the striking column 602 to strike the inner wall of the filter barrel 204 quickly, causing the filter barrel 204 to vibrate. The fine sand and gravel in the filter holes of the filter barrel 204 are dislodged from the filter holes under the action of vibration, preventing the fine sand and gravel from clogging the filter holes of the filter barrel 204 and ensuring the separation efficiency of wastewater and sand and gravel aggregate.

[0030] like Figure 8 and Figure 9 As shown, a discharge pipe 801 for discharging sand and gravel aggregate is fixedly installed through the front side of the primary bucket 1. A first impeller 205 is rotatably installed at the top of the discharge pipe 801. A second impeller 802 is rotatably fitted on the middle of the outer wall of the discharge pipe 801. Four first scrapers 803 that are slidably connected to the inner wall of the primary bucket 1 are fixedly connected to the second impeller 802. A water level gauge 100 is installed on the outer wall of the discharge pipe 801. A butterfly valve 200 that is electrically connected to the water level gauge 100 is installed at the bottom of the primary bucket 1.

[0031] like Figure 8 and Figure 9As shown, a second scraper 901 is fixedly connected to the first scraper 803 and slidably connected to the inner wall of the first-stage tank 1. The first scraper 803 and the second scraper 901 scrape off the flocculent material adhering to the inner wall of the first-stage tank 1. When the butterfly valve 200 is opened, the second impeller 802 can make the first scraper 803 and the second scraper 901 move under the action of the wastewater flow to clean the inner wall of the first-stage tank 1.

[0032] Initially, butterfly valve 200 is closed, sealing the bottom of primary tank 1. Sand and gravel aggregate enter the discharge pipe 801 through the lower speed-reducing plate 301 and fall down the pipe. Wastewater is thrown against the inner wall of primary tank 1 by the first impeller 205 and flows downwards along the inner wall. During this process, flocculent material adheres to the inner wall of primary tank 1. When the wastewater level in primary tank 1 reaches the level gauge 100, the level gauge 100 controls butterfly valve 200 to open. When started, the wastewater in the primary tank 1 is gradually discharged through the butterfly valve 200. During this process, the water flow impacts the blades of the second impeller 802, causing it to rotate counterclockwise and drive the four first scrapers 803 to move. The first scrapers 803 drive the second scrapers 901 to move. The first scrapers 803 and the second scrapers 901 scrape off the flocculent material attached to the inner wall of the primary tank 1, so that the flocculent material is discharged with the wastewater, preventing the flocculent material from adhering and accumulating on the inner wall of the primary tank 1 and causing the volume of the primary tank 1 to shrink.

[0033] Once the wastewater has been completely discharged, the water level gauge 100 controls the butterfly valve 200 to close, thus completing the wastewater treatment process.

[0034] An operating method for a device for recycling and utilizing wastewater from a concrete mixing plant includes the following steps: S1: Put the wastewater into the secondary tank 101, control the output shaft of the motor 202 to rotate, so that the centrifugal plate 203 throws the wastewater containing sand and gravel aggregates into the filter tank 204 to achieve solid-liquid separation. S2: The regulating mechanism automatically adjusts the dosage of flocculant sprayed from the nozzle 206 according to the amount of wastewater input. When the first impeller 205 throws the wastewater onto the inner wall of the first stage tank 1, the flocculant is evenly mixed into the wastewater. S3: When the wastewater is discharged, the second impeller 802 drives several first scrapers 803 to move under the action of the wastewater flow. The first scrapers 803 drive the second scrapers 901 to move and clean the inner wall of the first-stage tank 1.

[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A device for recycling wastewater from a concrete mixing plant, comprising a primary tank (1), wherein a secondary tank (101) is connected through the primary tank (1), characterized in that: It also includes a separation and mixing mechanism located in the primary tank (1) and the secondary tank (101). The separation and mixing mechanism includes a cone cover (201) fixedly installed in the secondary tank (101) and a centrifugal plate (203) located on the lower side of the cone cover (201) and driven by a motor (202). A filter tank (204) for filtering sand and gravel aggregate in wastewater is fixedly connected in the secondary tank (101). A first impeller (205) for uniformly distributing wastewater is fixedly connected on the centrifugal plate (203). A spray pipe (206) for spraying flocculant is fixedly connected through the primary tank (1). The spray pipe (206) is provided with an adjustment mechanism for adjusting the amount of flocculant sprayed according to the amount of wastewater.

2. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 1, characterized in that: The separation and mixing mechanism also includes two speed-reducing plates (301) fixedly installed inside the filter barrel (204).

3. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 2, characterized in that: The adjustment mechanism includes an input pipe (401) that is fixedly inserted through the primary barrel (1) and communicates with the nozzle (206), and an adjustment plate (402) is slidably connected through the input pipe (401).

4. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 3, characterized in that: The adjustment mechanism also includes an adjustment frame (501) that is slidably mounted on the first-stage bucket (1). A tension spring is provided between the adjustment frame (501) and the first-stage bucket (1), and a connecting rod (502) is provided between the adjustment frame (501) and the adjustment plate (402).

5. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 4, characterized in that: Inside the filter barrel (204), there are two rocker arms (601) hinged by a pair of support plates. A torsion spring is provided between the rocker arms (601) and the support plates. A striking post (602) for striking the filter barrel (204) is fixedly installed at the end of the rocker arms (601).

6. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 5, characterized in that: A pair of protruding shafts (701) that cooperate with the rocker arm (601) are fixedly installed on the first impeller (205).

7. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 6, characterized in that: A discharge pipe (801) is fixedly installed through the primary bucket (1). The first impeller (205) is rotatably installed on the discharge pipe (801). A second impeller (802) is rotatably fitted on the discharge pipe (801). Several first scrapers (803) that are slidably connected to the inner wall of the primary bucket (1) are fixed on the second impeller (802).

8. The device for recycling and utilizing wastewater from a concrete mixing plant according to claim 7, characterized in that: A second scraper (901) is fixedly connected to the first scraper (803) and slidably connected to the inner wall of the first-stage bucket (1).

9. A device for recycling and utilizing wastewater from a concrete mixing plant according to claim 8, characterized in that: The second impeller (802) can cause the first scraper (803) and the second scraper (901) to move and clean the inner wall of the primary tank (1) under the action of the wastewater flow.

10. The operating method of the device for recycling and utilizing wastewater from a concrete mixing plant according to claim 9, characterized in that: Includes the following steps: S1: The wastewater is put into the secondary tank (101), and the output shaft of the motor (202) is controlled to rotate, so that the centrifugal plate (203) throws the wastewater containing sand and gravel aggregates toward the filter tank (204) to achieve solid-liquid separation; S2: The regulating mechanism automatically adjusts the dosage of flocculant sprayed by the nozzle (206) according to the amount of wastewater input. When the first impeller (205) throws the wastewater onto the inner wall of the first-stage tank (1), the flocculant is evenly mixed into the wastewater. S3: When the wastewater is discharged, the second impeller (802) drives several of the first scrapers (803) to move under the action of the wastewater flow. The first scrapers (803) drive the second scrapers (901) to move to clean the inner wall of the first-stage barrel (1).

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