CN219058760U - Concrete mixing plant waste water cyclic utilization system - Google Patents

Abstract

The application relates to the technical field of concrete production, and solves the problem of poor clarification effect of waste water of a concrete mixing plant, and discloses a waste water recycling system of the concrete mixing plant, which comprises a primary filtering device, a centrifugal device, a separating device and a sedimentation device which are sequentially connected, wherein the primary filtering device is connected with a waste water pipe and is used for filtering sand and stone with larger particles; the centrifugal device is used for filtering sand grains with smaller volume; the separating device comprises a separating box and a stirring mechanism, a charging hole for adding the cement separating agent is formed in the top of the separating box, and the stirring mechanism enables the cement separating agent to react with hydrated ions in water to be fused into particles and be deposited at the bottom of the separating box; the sedimentation device comprises a sedimentation tank and a separation net arranged at the top of the sedimentation tank, wherein the separation net is internally filled with an absorption part, the side wall of the sedimentation tank is connected with a water outlet pipe, and the clarified water on the upper layer of the sedimentation tank is returned to the stirring production line for reuse after the peculiar smell and suspended matters in the water are absorbed by the absorption part.

Description

Waste water recycling system for concrete mixing plant

technical field

The present application relates to the technical field of concrete production, in particular to a waste water recycling system of a concrete mixing plant.

Background technique

At present, my country's infrastructure construction is advancing rapidly. Concrete is the most basic infrastructure material. With the gradual increase in the amount of concrete, concrete mixing plants have also developed rapidly. During the production and operation of the concrete mixing station, it is often necessary to wash the mixing equipment to prevent the waste from solidifying and hardening on the equipment and affecting the next use. A large amount of waste water will inevitably be generated. In order to save energy and protect the environment, the waste water needs to be recycled.

There is an existing waste water filtration and recovery system for a concrete mixing plant, which includes a separation device and a filter tank. The separation device includes a separation bin and a centrifugal mechanism. The centrifugal mechanism includes a drum screen that is rotatably connected to the separation bin. One end is connected to the water inlet pipe, and the lower end is provided with a motor that drives the trommel to rotate. The lower end of the trommel screen is also provided with a discharge port; The output end is connected with a suction pipe communicated with the filter pool.

In the above-mentioned related technology, the waste water is firstly separated from a large amount of fine sand and water through the separation device, and then the waste water is pumped into the filter box, thereby improving the filtration efficiency of the concrete waste water. However, in addition to a small amount of cement with a low degree of hydration and solid particles such as fine sand, admixtures, and clay, concrete wastewater also contains a large amount of hydration ions and some solid suspended particles. Studies have shown that when the concentration of wastewater is below 5%, Concrete mixture has the best workability, but ions and suspended particles are difficult to deposit in the sedimentation tank, and the secondary use of waste water with poor clarification effect will lead to performance degradation and poor cohesion of concrete.

Contents of the invention

In order to improve the defect of poor clarification effect of wastewater from concrete mixing plants, the present application provides a recycling system for wastewater from concrete mixing plants.

This application provides a waste water recycling system for a concrete mixing plant, which adopts the following technical scheme:

A waste water recycling system for a concrete mixing plant, comprising:

The primary filter device includes a primary filter box and a filter screen arranged in the primary filter box, the top of the primary filter box is connected to a waste water pipe, and the bottom of the primary filter box is connected to a first water pump;

The centrifugal device includes a centrifugal box and a centrifugal mechanism arranged on the centrifugal box, and a second water pump is connected to the bottom of the centrifugal box;

The separation device includes a separation box and a stirring mechanism arranged on the separation box, the side wall of the separation box is connected to the water outlet of the second water pump, a feeding port is opened on the top of the separation box, and the separation A third water pump is also connected to the side wall of the tank; and

The settling device includes a settling tank and a partition net arranged on the top of the settling tank, and the partition net is filled with adsorbents, and the side wall of the settling tank is connected with a fourth water pump at the position of the partition net. A water outlet pipe is connected to the water outlet of the fourth water pump.

By adopting the above technical scheme, the wastewater from the concrete mixing plant is first discharged into the primary filter box, the filter screen filters the larger particles of sand, and the first water pump pumps the preliminary filtered water into the centrifuge box; The sand particles left behind, the secondary filtered water flows into the bottom of the centrifuge box and is pumped into the separation box by the second water pump; open the feeding port and add an appropriate cement separating agent, and the stirring mechanism makes the cement separating agent react with the hydration ions in the water and fuse The water after three times of treatment is pumped into the sedimentation tank by the third water pump; the relatively clear water in the upper layer of the sedimentation tank is then absorbed by the adsorption piece to absorb the peculiar smell and part of the suspended matter in the water The fourth water pump is pumped out and returned to the mixing production line of the concrete mixing plant through the outlet pipe for reuse.

Optionally, the two ends of the side wall of the primary filter box along the length direction are respectively provided with a first roller with a lower height and a second roller with a higher height, and the filter screen is sleeved on the two second rollers. Between the first turning roller and the second turning roller, the primary filter device also includes a first driving member for driving the first turning roller or the second turning roller to rotate, and the lower part of the second turning roller is arranged There is a first collecting box.

By adopting the above technical solution, the filter screen is set in the form of an inclined conveyor belt, and the first driving member drives the first rotating roller or the second rotating roller to rotate, thereby driving the filter screen to rotate and then separating the filtered sand from low to high transmission. Filter screen, and fall into the first collecting box, which is convenient for material recovery, and at the same time, the waste water directly falls into the bottom of the primary filter box through the filter screen, so as to realize the preliminary separation of water and impurities.

Optionally, the filter screen is connected with a material guide plate at the second rotating roller, and the end of the material guide plate away from the filter screen extends out of the primary filter box.

By adopting the above technical scheme, the material guide plate is located under the second roller, which can reduce the possibility of the filtered sand and gravel falling into the primary filter box, and can also have a certain scraping effect on the filter screen, reducing sand and gravel. The possibility of stone clogging on the filter mesh improves the filtration effect of wastewater. The material guide plate extends out of the primary filter box, and the first collection box is set outside the primary filter box, which is convenient for recycling and transporting sand and gravel.

Optionally, a spray head is provided on the inner wall of the primary filter box above the filter screen.

By adopting the above technical scheme, the spray head sprays clean water to clean the wastewater slurry adhering to the surface of the sand and gravel, so as to facilitate the subsequent recycling of the sand and gravel. The water generated during the cleaning process also falls through the filter to the bottom of the primary filter box , is pumped to the subsequent filter equipment.

Optionally, the centrifugal mechanism includes a centrifugal cylinder, the wall of the centrifugal cylinder is provided with screen holes, and one end of the centrifugal cylinder is rotatably connected to the inner wall of the centrifugal box and communicated with the water outlet of the first water pump The end of the centrifugal cylinder away from the first water pump is provided with a discharge port and is connected with a second driving member that drives the centrifugal cylinder to rotate, and a second collection box is arranged below the second rotating roller .

By adopting the above technical scheme, the wastewater initially filtered by the primary filter box is directly pumped into the centrifuge cylinder through the first water pump, and the second driving member drives the centrifuge cylinder to rotate so that the fine sand particles are separated from the water, the fine sand remains in the centrifuge cylinder, and the wastewater flows along the The sieve holes flow down to the bottom of the centrifugal box to separate the fine sand from the water, and the fine sand can also fall into the second collecting box from the centrifugal cylinder through the discharge port.

Optionally, the discharge port protrudes from the centrifugal box.

By adopting the above technical scheme, the discharge port of the centrifugal cylinder protrudes from the centrifugal box, and the second collection box is arranged outside the centrifugal box, which is convenient for recycling and transporting sand particles.

Optionally, the stirring mechanism includes a stirring rod arranged in the separation box and a third driving member for driving the stirring rod to rotate, and the stirring rod is provided with several paddles.

By adopting the above technical scheme, the stirring mechanism is specifically set as a rotatable paddle to stir the wastewater, so that additives such as cement separators can fully react with ions in the water, improve the filtration and clarification effect of the wastewater, and make the wastewater reach the standard of secondary utilization .

Optionally, a fine mesh filter is provided at the opening where the side wall of the separation box is connected to the third water pump.

By adopting the above technical solution, the fine sieve filter can reduce the possibility that the particles generated by the reaction will be turned to the upper layer on the water surface by the stirring mechanism and then be pumped to the next process.

Optionally, the water outlet end of the fourth water pump is further connected with a water return pipe, and the water return pipe communicates with the shower head.

By adopting the above technical scheme, the clarified wastewater can return to the primary filter device through the return pipe to clean the sand and gravel. The wastewater recycling system does not need external clean water, which further improves the utilization rate of wastewater and is more energy-saving and environmentally friendly.

In summary, the present application includes at least one of the following beneficial effects:

1. The wastewater from the concrete mixing plant can filter and remove large particles of sand, fine sand, hydration ions, suspended solids and odors in the water step by step through the sequentially connected primary filter device, centrifugal device, separation device and sedimentation device. Improve the clarification effect of wastewater so as to meet the standard of secondary utilization;

2. The filter screen is set on the first rotating roller and the second rotating roller in the form of an inclined conveyor belt, which can not only improve the filtering effect, but also send the filtered sand to the first collection box, which is convenient for sand and gravel recycle and re-use;

3. The centrifugal cylinder filters out the fine sand and falls into the second collection box, which is convenient for recycling the sand.

Description of drawings

Fig. 1 is the working flow diagram of the waste water recycling system of the concrete mixing plant in the embodiment of the present application;

Fig. 2 is the structural schematic diagram of the waste water recycling system of the concrete mixing plant in the embodiment of the present application;

Fig. 3 is the cross-sectional view of primary filter device in the embodiment of the present application;

Fig. 4 is the cross-sectional view of centrifugal device in the embodiment of the present application;

Fig. 5 is a sectional view of the separation device in the embodiment of the present application;

Fig. 6 is a cross-sectional view of the precipitation device in the embodiment of the present application.

Explanation of reference signs: 1, waste water pipe; 2, primary filter device; 21, primary filter box; 211, baffle plate; 22, filter screen; 23, first water pump; 24, first rotary roller; 25, second rotary Roller; 26. The first driving member; 27. The first collecting box; 28. Material guide plate; 29. Spray head; 3. Centrifugal device; 31. Centrifugal box; 32. Centrifugal mechanism; 321. Centrifugal cylinder; 322 , the second driving member; 323, the screen hole; 324, the discharge port; 325, the guide plate; 33, the second water pump; 34, the second collection box; 4, the separation device; 41, the separation box; 411, the feeding port ; 42, stirring mechanism; 421, the third driving member; 422, stirring rod; 423, paddle; 43, the third water pump; 44, fine screen filter; 5, sedimentation device; 51, sedimentation box; 52, spacer ; 53, adsorption piece; 54, the fourth water pump; 6, outlet pipe; 7, return pipe.

Detailed ways

The present application will be described in further detail below in conjunction with accompanying drawings 1-6.

Referring to Figure 1 and Figure 2, the embodiment of the present application discloses a waste water recycling system for a concrete mixing plant, which includes a primary filter device 2, a centrifuge device 3, a separation device 4 and a sedimentation device 5 connected in sequence, and the waste water is discharged into the primary filter device 2 After filtration, it flows out from the sedimentation device 5 and returns to the mixing equipment. This system can gradually remove large particles of sand, fine sand, hydration ions, suspended solids and odors in the water, and improve the wastewater clarification effect to achieve secondary Standards used.

With reference to Fig. 3, primary filter device 2 comprises primary filter box 21, and the top of primary filter box 21 is communicated with waste water pipe 1, and the bottom is connected with the first water pump 23 that the waste water after primary filtration is pumped in centrifugal device 3, primary filter box 21 is provided with filter screen 22, and the water outlet of waste water pipe 1 is arranged on filter screen 22 top, and the shape of filter screen 22 can be set to be consistent with the cross section of primary filter box 21 and be fixedly connected with primary filter box 21. In order to improve the filtering effect and facilitate the recovery of the first filtered sand and gravel, the two ends of the side wall of the primary filter box 21 along the length direction are respectively provided with a first turning roller 24 with a lower height and a second turning roller 25 with a higher height. The first turning roller 24 or the second turning roller 25 is connected with the first driving member 26 that drives the first turning roller 24 or the second turning roller 25 to rotate, and the first driving member 26 is arranged on the outer wall of the primary filter box 21, and the filter The net 22 is sleeved between the two first turning rollers 24 and the second turning roller 25 so as to be arranged in the form of an inclined conveyor belt. The filter screen 22 is connected with a material guide plate 28 at the second turning roller 25, and the material guide plate 28 is away from One end of the filter screen 22 protrudes from the primary filter box 21 , and a first collecting box 27 is arranged below the material guide plate 28 . In order to prevent sand from moving between the first turn roller 24 and the wall of the primary filter box 21, the inner wall of the primary filter box 21 is provided with a baffle plate 211 near the first turn roller 24, and the baffle plate 211 and the filter screen 22 Abut. The filtered sand and gravel are transported from low to high and detached from the filter screen 22 and fall into the first collecting box 27. At the same time, the waste water directly falls into the bottom of the primary filter box 21 through the filter screen 22 to realize the preliminary separation of water and impurities.

Further, with reference to Fig. 2 and Fig. 3, in order to facilitate the recycling of sand and gravel, the inner wall of the primary filter box 21 is provided with a shower head 29 above the filter screen 22, and the shower head 29 sprays clear water for cleaning the adhering For the wastewater slurry on the gravel surface, the outlet of the fourth water pump 54 is connected to the return pipe 7, and the return pipe 7 is connected to the sprinkler head 29. The waste water recycling system does not need external clean water, which further improves the utilization rate of waste water and is more energy-saving and environmentally friendly.

Referring to Fig. 4, centrifugal device 3 comprises centrifugal case 31 and the centrifugal mechanism 32 that is arranged on centrifugal case 31, and the bottom of centrifugal case 31 is connected with second water pump 33, and centrifugal mechanism 32 comprises the centrifugal cylinder 321 that horizontal setting, the centrifugal cylinder 321 A screen hole 323 is opened on the cylinder wall, and one end of the centrifugal cylinder 321 is rotationally connected with the inner wall of the centrifugal box 31 and communicated with the water outlet of the first water pump 23 , and the end of the centrifugal cylinder 321 far away from the first water pump 23 is provided with a discharge port 324 And it is connected with the second driving member 322 that drives the centrifugal cylinder 321 to rotate, the second driving member 322 is arranged on the outside of the centrifugal box 31, the inner wall of the centrifugal cylinder 321 is provided with a spiral guide plate 325, and the discharge port 324 protrudes from the centrifugal box 31. A second collection box 34 is arranged below the second rotating roller 25. The centrifugal cylinder 321 rotates to separate the fine sand from the water. The sand remains in the centrifugal cylinder 321 and continues to the discharge port 324 with the guide plate 325. The waste water flows down to the bottom of the centrifuge box 31 along the sieve hole 323 to realize the separation of water and sand particles.

With reference to Fig. 5, separation device 4 comprises separation box 41 and the stirring mechanism 42 that is arranged on the separation box 41, and the side wall of separation box 41 is communicated with the water outlet end of second water pump 33, and the top of separation box 41 is provided with for adding cement separation. The feeding port 411 of the additives such as machine, the outer wall of separation case 41 is hinged to be flipped at the feeding port 411 place, and the side wall of separation case 41 is also connected with the 3rd water pump 43, and the 3rd water pump 43 is preferably arranged as the top of separation case 41 It is connected to extract relatively clear water from the upper layer, and the side wall of the separation box 41 is connected to the opening of the third water pump 43 to be provided with a fine mesh filter 44 . The stirring mechanism 42 includes a stirring rod 422 arranged in the separation box 41 and a third driver 421 for driving the stirring rod 422 to rotate. on the wall. In other embodiments, the stirring rod 422 can be set as a reciprocating screw rod, and the paddle 423 is set at the end of the stirring rod 422 away from the third driving member 421 so that it can reciprocate vertically while rotating, further improving the stirring effect, so that Additives such as cement separating agent fully react with ions in water, improve the filtration and clarification effect on wastewater, and make wastewater meet the standard of secondary utilization.

It should be noted that the first driving member 26 , the second driving member 322 and the third driving member 421 can all be configured as motors, air cylinders or hydraulic cylinders, and are preferably configured as motors in this embodiment.

With reference to Fig. 6, settling device 5 comprises settling box 51 and is arranged on the partition net 52 of settling box 51 tops, is filled with adsorbent 53 in the partition net 52, and adsorbent 53 can be active carbon, and the side wall of settling box 51 is separated from partition net 52 The position of the fourth water pump 54 is connected with the water outlet end of the fourth water pump 54 with the water outlet pipe 6 . The relatively clear water in the upper layer of the settling tank 51 is pumped out by the fourth water pump 54 through the adsorption member 53 to absorb the peculiar smell and part of the suspended solids in the water, and then returned to the mixing production line of the concrete mixing plant through the outlet pipe 6 for reuse.

The implementation principle of a concrete mixing plant wastewater recycling system in the embodiment of the present application is as follows:

The waste water from the concrete mixing plant is first discharged into the primary filter box 21, the filter screen 22 filters the larger particles of sand and gravel, and the spray head 29 sprays clean water to clean the waste slurry adhering to the surface of the sand and gravel, and the sand and gravel are conveyed In the first collection box 27, the first water pump 23 pumps the preliminary filtered water into the centrifugal cylinder 321; the centrifugal cylinder 321 leaves the smaller sand particles and guides them into the second collection box 34 through the guide groove, The water filtered twice flows into the bottom of the centrifuge box 31 through the sieve hole 323 and is pumped into the separation box 41 by the second water pump 33; the feeding port 411 is opened to add a suitable cement separating agent, and the rotating paddle 423 makes the cement separating agent and the water The hydration ions reacted and fused into particles and precipitated at the bottom of the separation box 41, and the water in the upper layer of the separation box 41 was pumped into the sedimentation tank 51 by the third water pump 43; the relatively clear water in the upper layer of the sedimentation tank 51 passed through the adsorption piece 53 After absorbing the peculiar smell and part of the suspended matter in the water, it is pumped out by the fourth water pump 54. One is to return to the concrete mixing plant through the outlet pipe 6 for reuse, and the other is to return to the sprinkler head 29 through the return pipe 7 for utilization.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims (9)

1. A concrete batching plant wastewater recycling system, comprising:

the primary filtering device (2) comprises a primary filtering box (21) and a filter screen (22) arranged in the primary filtering box (21), wherein the top of the primary filtering box (21) is communicated with a waste water pipe (1), and the bottom of the primary filtering box (21) is connected with a first water pump (23);

the centrifugal device (3) comprises a centrifugal box (31) and a centrifugal mechanism (32) arranged on the centrifugal box (31), and the bottom of the centrifugal box (31) is connected with a second water pump (33);

the separation device (4) comprises a separation box (41) and a stirring mechanism (42) arranged on the separation box (41), the side wall of the separation box (41) is communicated with the water outlet end of the second water pump (33), a charging port (411) is formed in the top of the separation box (41), and the side wall of the separation box (41) is also connected with a third water pump (43); and

the sedimentation device (5) comprises a sedimentation tank (51) and a separation net (52) arranged at the top of the sedimentation tank (51), an absorption part (53) is filled in the separation net (52), a fourth water pump (54) is connected to the side wall of the sedimentation tank (51) at the position of the separation net (52), and a water outlet end of the fourth water pump (54) is connected with a water outlet pipe (6).

2. The concrete mixing plant wastewater recycling system according to claim 1, wherein the primary filter box (21) is provided with a first rotating roller (24) with a lower height and a second rotating roller (25) with a higher height at two ends of the side wall along the length direction respectively, the filter screen (22) is sleeved between the two first rotating rollers (24) and the second rotating rollers (25), the primary filter device (2) further comprises a first driving piece (26) for driving the first rotating rollers (24) or the second rotating rollers (25) to rotate, and a first collecting box (27) is arranged below the second rotating rollers (25).

3. A concrete mixing plant waste water recycling system according to claim 2, characterized in that the filter screen (22) is connected with a material guiding plate (28) at the second rotating roller (25), and one end of the material guiding plate (28) far away from the filter screen (22) extends out of the primary filter box (21).

4. A concrete mixing plant waste water recycling system according to claim 3, characterized in that the inner wall of the primary filter box (21) is provided with a spray header (29) above the filter screen (22).

5. The concrete mixing plant wastewater recycling system according to claim 2, wherein the centrifugal mechanism (32) comprises a centrifugal cylinder (321), a screen hole (323) is formed in the cylinder wall of the centrifugal cylinder (321), one end of the centrifugal cylinder (321) is rotatably connected with the inner wall of the centrifugal box (31) and is communicated with the water outlet end of the first water pump (23), the centrifugal cylinder (321) is far away from one end communicated with the first water pump (23) and is provided with a discharge hole (324) and a second driving piece (322) for driving the centrifugal cylinder (321) to rotate, and a second collecting box (34) is arranged below the second rotating roller (25).

6. A concrete mixing plant waste water recycling system according to claim 5, characterized in that the discharge opening (324) protrudes from the centrifugal box (31).

7. A concrete mixing plant waste water recycling system according to claim 1, characterized in that the mixing mechanism (42) comprises a mixing rod (422) arranged in the separation tank (41) and a third driving piece (421) for driving the mixing rod (422) to rotate, and a plurality of paddles (423) are arranged on the mixing rod (422).

8. A concrete mixing plant waste water recycling system according to claim 1, characterized in that the side wall of the separating tank (41) is provided with a fine screen (44) connected to the opening of the third water pump (43).

9. The concrete mixing plant wastewater recycling system according to claim 4, wherein the water outlet end of the fourth water pump (54) is further connected with a water return pipe (7), and the water return pipe (7) is communicated with the spray header (29).

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