CN117069317A - Wastewater treatment system for sand and gravel processing and method of use - Google Patents

Abstract

The invention relates to the technical field of sand and stone wastewater treatment, and discloses a wastewater treatment system for sand and stone processing and a use method thereof, wherein the wastewater treatment system comprises a pretreatment unit, a wastewater treatment unit, a wastewater recycling unit and a sludge treatment unit; the pretreatment unit comprises a water inlet main pipe, a water inlet gate is arranged on the right side of the water inlet main pipe, an outlet of the water inlet gate is connected with a grid area, a first sewage pump is arranged on the right side of the grid area, and a working outlet of the first sewage pump is connected with a first grit chamber; the wastewater treatment unit comprises a first water sand setting tank, a second sand setting tank, a flocculation sedimentation tank, an activated carbon adsorption tank and a back flushing water system. According to the wastewater treatment system for sand and stone processing and the application method, different precipitation structures and equipment are respectively used for treating sand-containing wastewater and slurry, so that sand, slurry and water are separated, and the wastewater treatment efficiency is high, the energy consumption is low, and the wastewater can be recycled.

Description

Wastewater treatment system for sand and gravel processing and method of use

Technical field

The present invention relates to the technical field of sand and gravel wastewater treatment, specifically a wastewater treatment system for sand and gravel processing and a method of use.

Background technique

Sand washing wastewater refers to the wastewater produced by water-washed sand and gravel production enterprises when washing sand during the production process. The main pollution factors of sand washing wastewater are chemical oxygen demand and suspended solids. If the production wastewater is not treated promptly and effectively, Not only will it waste a large amount of water resources, pollute water quality, affect road traffic, and affect the normal production and life of nearby residents, it will even intensify social conflicts and add disharmonious factors to society.

The existing method of treating sand and gravel wastewater is to first divide the sewage area at the bottom of the advection sedimentation tank into two sewage areas according to the advection direction of the water in the advection sedimentation tank, and then connect the two sewage areas to their respective Sand and gravel discharge system; then the sand and gravel in the two sewage discharge areas are discharged to the outside of the advection sedimentation tank through their respective sand and gravel discharge systems. However, this method does not solve the problems of mud and gravel separation and water recycling. Big waste. The technical problem to be solved by the present invention is to provide a sand and gravel processing and flushing wastewater treatment system and method, which can recover sand in the wastewater, has high wastewater treatment efficiency, requires less equipment, and has low energy consumption. In the preferred solution, the sand in the wastewater can be recycled in stages, the mud can be concentrated, the volume of mud transported out can be reduced, and the wastewater can be recycled. In addition, the present invention provides two wastewater treatment systems for sand and gravel processing and their usage methods, which are respectively used to treat normal conditions and when the amount of sludge is large.

Contents of the invention

(1) Technical problems solved

In view of the shortcomings of the existing technology, the present invention provides a wastewater treatment system for sand and gravel processing and a method of use, which has the advantages of high wastewater treatment efficiency, low energy consumption, wastewater utilization, multi-mode treatment, etc., and solves the problem of wastewater treatment efficiency. Low energy consumption, high energy consumption, inability to utilize wastewater, and single treatment problems.

(2) Technical solutions

In order to achieve the above-mentioned goals of high wastewater treatment efficiency, low energy consumption, wastewater utilization, and multi-mode treatment, the present invention provides the following technical solutions:

A wastewater treatment system for sand and gravel processing and a method of use, including a pretreatment unit, a wastewater treatment unit, a wastewater reuse unit and a sludge treatment unit;

The pretreatment unit includes a water inlet main pipe. A water inlet gate is provided on the right side of the water inlet main pipe. The outlet of the water inlet gate is connected to the grille area. A first sewage pump is provided on the right side of the grille area. The working outlet of the first sewage pump is connected to the first grit tank, and the first grit tank is connected to the second grit tank;

The wastewater treatment unit includes a first water grit tank, a second grit tank, a flocculation sedimentation tank, an activated carbon adsorption tank and a backwash water system.

As a preferred technical solution of the present invention, the wastewater reuse unit includes a backwash water system, a reuse water pump and a reuse water pipe. The reuse water pump is located on the right side of the washing system. The reuse water pump and the backwash water system Connect via a draft tube.

As a preferred technical solution of the present invention, the first grit tank is connected to the second grit tank through a flow pipe, and a mud scraper is provided at the bottom of the first grit tank and the second grit tank.

As a preferred technical solution of the present invention, the grid area is provided with a coarse grid pool and a fine grid pool, and the coarse grid pool and the fine grid pool are equipped with a slag chute.

As a preferred technical solution of the present invention, the flocculation sedimentation tank is equipped with a flocculant dosing system, a stirring system and a mud discharge system. The backwash water system includes a backwash water supply system, a backwash drainage system and a backwash pump station. .

As a preferred technical solution of the present invention, the sludge treatment unit includes a backwash water system. The backwash water system and the sludge generated in the flocculation sedimentation tank enter the sludge concentration tank for concentration to further remove moisture in the sludge.

The concentrated sludge is dehydrated through mechanical dehydration equipment. The dehydrated dry sludge can be utilized as resources, such as making cement, building materials, etc.

A method of using a wastewater treatment system for sand and gravel processing, including the following steps:

1. Wastewater enters the grille area through the inlet gate. In the grille area, after the wastewater passes through the grille, it enters the first grit chamber through the first sewage pump.

2. After the first grit chamber, the wastewater enters the second advection grit chamber. In the second grit chamber, the wastewater passes through sedimentation and then enters the flocculation sedimentation tank.

3. In the flocculation sedimentation tank, the suspended particles in the wastewater are quickly precipitated to form sludge by adding flocculant.

4. The wastewater after forming sludge enters the activated carbon adsorption pool, and heavy metal ions and other organic pollutants in the wastewater are removed through the adsorption of activated carbon.

5. The wastewater after adsorption treatment enters the backwash water system, and the activated carbon is regenerated and recycled through the backwash water system.

As a preferred technical solution of the present invention, the first grit settling tank includes a horizontal flow sedimentation tank and a vertical flow sedimentation tank. In addition, it is also provided with a regulating pool, a water collection well and a sludge concentration tank. The water collection well is provided with two openings. One opening flows to the advection sedimentation tank, and the other opening flows to the vertical flow sedimentation tank.

As a preferred technical solution of the present invention, the regulating pool, the water collection well and the sludge concentration tank are also provided; when the amount of mud in the water inlet gate is large, the second grit settling tank sends the mud to the sludge concentration tank. In the concentration tank, the settled water in the sludge concentration tank is sent to the water collection well, the liquid in the adjustment pool is sent to the water collection well, and the liquid in the water collection well is sent to the first grit settling tank to settle again.

As a preferred technical solution of the present invention, when the amount of mud in the water inlet gate is large, a horizontal flow sedimentation tank will be used. When the amount of mud in the water inlet gate is small, a vertical flow sedimentation tank will be used. Pool.

(3) Beneficial effects

Compared with the existing technology, the present invention provides a wastewater treatment system and usage method for sand and gravel processing, which has the following beneficial effects:

1. This wastewater treatment system and usage method for sand and gravel processing separates sand, mud and water by treating sandy wastewater and mud with different sedimentation structures and equipment respectively. This method of wastewater treatment efficiency High, low energy consumption, and can recycle waste water.

2. The wastewater treatment system and usage method for sand and gravel processing can change the treatment process route according to the working conditions of the system through a variety of treatment structures, improving the applicability of the entire treatment system to different working conditions.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of Embodiments 1 and 2 of the present invention;

Figure 2 is a schematic diagram of the wastewater treatment structure of Embodiments 1 and 2 of the present invention;

Figure 3 is a system schematic diagram of Embodiments 1 and 2 of the present invention;

Figure 4 is a schematic diagram of the overall structure of Embodiment 2 of the present invention.

In the picture: 1. Inlet main pipe; 2. Inlet gate; 3. Grille area; 4. First sewage pump; 5. First grit tank; 6. Second grit tank; 7. Coarse grid tank ; 8. Fine grid tank; 9. Advection sedimentation tank; 10. Vertical flow sedimentation tank; 11. Reuse water pump; 12. Reuse water pipe; 13. Flocculation sedimentation tank; 14. Activated carbon adsorption tank; 15. Reaction Flush water system; 16. Sludge concentration tank; 17. Mechanical dewatering equipment; 18. Regulating pool; 19. Water collecting well.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the following. It is intended that devices or elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be directly connected, or indirectly connected through an intermediary, or it can be internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

Example 1:

Please refer to Figure 1-3, a wastewater treatment system for sand and gravel processing and its use method, including a pretreatment unit, a wastewater treatment unit, a wastewater reuse unit and a sludge treatment unit;

The pretreatment unit includes a water inlet main pipe 1. A water inlet gate 2 is provided on the right side of the water inlet main pipe 1. The outlet of the water inlet gate 2 is connected to the grille area 3. A first sewage pump 4 is provided on the right side of the grille area 3. The working outlet of the first sewage pump 4 is connected to the first grit tank 5, and the first grit tank 5 is connected to the second grit tank 6;

The wastewater treatment unit includes a first water grit tank 5, a second grit tank 6, a flocculation sedimentation tank 13, an activated carbon adsorption tank 14 and a backwash water system 15.

In this embodiment, the first grit chamber 5 is connected to the second grit chamber 6 through a flow pipe. A mud scraper is provided at the bottom of the first grit chamber 5 and the second grit chamber 6. The main functions of the mud scraper are: Remove the sludge settled at the bottom of the pool, reduce the volume of sludge, and increase the sludge concentration, thereby effectively removing scum on the pool surface. For the second grit tank 6, the mud scraper also needs to suck out the activated sludge settled at the bottom of the second grit tank 6. The second grit tank 6 is generally equipped with a scraper to assist in suctioning mud.

Grille area The grille area 3 is equipped with a coarse grille pool 7 and a fine grille pool 8. The main functions of the coarse grille pool and the fine grille pool are to intercept dirt of different sizes for more effective sewage treatment; The grating spacing of the grating pool is usually 0.5cm, which mainly intercepts debris and suspended solids in the sewage; the effluent from the coarse grating pool flows into the regulating pool for further treatment; the grating spacing of the fine grating pool is usually 0.2cm , mainly intercepting smaller dirt; through the double interception of coarse grille and fine grille, various dirt in the sewage can be more effectively removed, providing clean sewage for the subsequent sewage treatment process; coarse grille pool 7 The fine grid pool 8 is provided with a slag chute, which is used to transport and intercept dirt; the fine grid pool and the dirt intercepted by the coarse grid are processed separately.

In this embodiment, the wastewater reuse unit includes a backwash water system 15, a reuse water pump 11 and a reuse water pipe 12. The reuse water pump 11 is located on the right side of the backwash water system 15, and the reuse water pump 11 and the backwash water system 15 pass through Diversion pipe connection; the function of the backwash water system 15 is mainly to clean each processing unit to remove clogging materials in the filter material, thereby increasing the permeability of the filter and reducing head loss; the function of the reuse water pump 11 is The treated water is reused in various stages of the water treatment process, which can reduce the demand for new water and improve the utilization efficiency of water resources; the recycled water pipe 12 transports the treated wastewater to where it is needed for reuse. .

In this embodiment, the flocculation sedimentation tank 13 is a device used to treat sewage. Its function is to use the action of flocculant to make the suspended solids and colloidal particles in the sewage form larger flocs to facilitate sedimentation and removal; The flocculation and sedimentation tank 13 is equipped with a flocculant dosing system, a stirring system and a mud discharge system; the flocculant dosing system is a key part of the flocculation and sedimentation tank, and it is necessary to ensure that the flocculant can fully mix with the sewage, so that the suspended matter in the sewage and Colloidal particles form larger flocs; the design of the mixing system can ensure that the sewage in the pool can be fully mixed, so that the flocculant and sewage are fully contacted to form larger flocs; the sludge discharge system can discharge the settled sludge in time to avoid Impact on water quality in the pool.

The sludge treatment unit includes a backwash water system 15. The sludge generated by the backwash water system 15 enters the sludge concentration tank 16 for concentration together with the sludge generated in the second grit chamber 6 and the flocculation sedimentation tank 13 to further remove sewage. Moisture in mud.

The concentrated sludge is dehydrated through mechanical dehydration equipment 17, and the dehydrated dry sludge can be utilized as resources, such as making cement, building materials, etc.

Example 2:

Please refer to Figures 1-4. Based on Embodiment 1, a wastewater treatment system for sand and gravel processing and its use method include the following steps:

1. When the amount of mud in the water inlet gate 2 is large, the second grit chamber 6 will send the mud to the sludge concentration tank 16, and the precipitated water in the sludge concentration tank 16 will be sent to the water collection well 19 to regulate the pool. The liquid in 18 is sent to the water collection well 19, and the liquid in the water collection well 19 is sent to the first grit chamber 5 to settle again.

2. After sedimentation again in the first grit tank 5, it then enters the second grit tank 6, flocculation sedimentation tank 13, activated carbon adsorption tank 14 and backwash water system 15.

In this embodiment, the first grit tank 5 includes a horizontal flow sedimentation tank 9 and a vertical flow sedimentation tank 10. In addition, it is also provided with a regulating tank 18, a water collection well 19 and a sludge concentration tank 16. The water collection well 19 is provided with two Openings, one opening flows to the horizontal flow sedimentation tank 9, and the other opening flows to the vertical flow sedimentation tank 10; the settled water in the sludge concentration tank 16 passes through the pipeline, and if necessary, a pump is set to be pumped to the regulating pool 18, and the regulating pool 18 passes through the pipe The water in the sludge concentration tank 16 is sent to the second water collection well 19 through the pipeline for dilution, and then the liquid in the second water collection well 19 is pumped to the first water collection well 19. The grit chamber 5 is sent from between the regulating pool 18 and the first grit chamber 5 for circulation within the system.

In this embodiment, a regulating pool 18, a water collection well 19 and a sludge concentration tank 16 are also provided; when the amount of sludge in the water inlet gate 2 is large, an advection sedimentation tank 9 will be used. When the water inlet gate 2 When the amount of sludge in the sediment is small, the vertical flow sedimentation tank 10 will be used. The horizontal flow sedimentation tank 9 has good sedimentation effect, stable working performance, and is suitable for large-scale sedimentation; the vertical flow sedimentation tank 10 occupies a small area and has low drainage capacity. It is easy to sludge, does not require mechanical equipment, and is easy to manage, but the vertical flow sedimentation tank 10 can only handle small and medium-sized wastewater treatment.

The working principle of the above embodiment is:

Wastewater enters the water inlet gate 2 through the water inlet main pipe 1 for storage, and then enters the grille area 3 through the water inlet gate 2. In the grille area 3, after passing through the grille, the wastewater enters through the first sewage pump 4 The first grit chamber 5. After the wastewater passes through the first grit chamber 5, it enters the second advection grit chamber 6. In the second grit chamber 6, the wastewater passes through sedimentation and then enters the flocculation sedimentation tank 13. Afterwards, in the flocculation sedimentation tank 13, by adding flocculant, the suspended particles in the wastewater are rapidly precipitated to form sludge. The wastewater after forming sludge enters the activated carbon adsorption pool 14, and heavy metal ions and other organic pollutants in the wastewater are removed through the adsorption of activated carbon. The wastewater after adsorption treatment enters the backwash water system 15, and the activated carbon is regenerated and recycled through the backwash water system.

Among them, the water treated by the backwash water system 15 enters the reuse water pump 11. The reuse water pump 11 will reuse the treated water through the reuse water pipe 12 for various stages of the water treatment process, which can reduce the demand for new water. , improve the utilization efficiency of water resources.

Among them, the sludge generated in the grid area 3, the flocculation sedimentation tank 13, the activated carbon adsorption tank 14 and the backwash water system 15 enters together with the sludge generated in the second grit settling tank 6 and the flocculation sedimentation tank 13. The sludge concentration tank 16 concentrates to further remove moisture in the sludge; the concentrated sludge is dehydrated through the mechanical dehydration equipment 17, and the dehydrated dry sludge can be utilized as resources, such as making cement, building materials, etc.

When the amount of mud in the water inlet gate 2 is large, the second grit chamber 6 sends the mud to the sludge concentration tank 16, and the precipitated water in the sludge concentration tank 16 is sent to the water collection well 19, and the regulating pool 18 The liquid is sent to the water collecting well 19, and the liquid in the water collecting well 19 is sent to the first grit settling tank 5 to settle again. After settling again in the first grit tank 5, it then enters the second grit tank 6, flocculation sedimentation tank 13, activated carbon adsorption tank 14 and backwash water system 15.

Beneficial effects of the above embodiments:

1. This wastewater treatment system and usage method for sand and gravel processing separates sand, mud and water by treating sandy wastewater and mud with different sedimentation structures and equipment respectively. This method of wastewater treatment efficiency High, low energy consumption, and can recycle waste water.

2. The wastewater treatment system and usage method for sand and gravel processing can change the treatment process route according to the working conditions of the system through a variety of treatment structures, improving the applicability of the entire treatment system to different working conditions.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principles and spirit of the invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. A wastewater treatment system for sand and gravel processing, including a pretreatment unit, a wastewater treatment unit, a wastewater reuse unit and a sludge treatment unit; It is characterized in that: the pretreatment unit includes a water inlet main pipe (1), a water inlet gate (2) is provided on the right side of the water inlet main pipe (1), and the outlet of the water inlet gate (2) is connected to the grille area ( 3) connection, a first sewage pump (4) is provided on the right side of the grille area (3), and the working outlet of the first sewage pump (4) is connected to the first grit tank (5). One grit tank (5) is connected to the second grit tank (6); The wastewater treatment unit includes a first water grit tank (5), a second grit tank (6), a flocculation sedimentation tank (13), an activated carbon adsorption tank (14) and a backwash water system (15). 2. A wastewater treatment system for sand and gravel processing according to claim 1, characterized in that: the wastewater reuse unit includes a backwash water system (15), a reuse water pump (11) and a reuse water pipe (12) ), the recycled water pump (11) is located on the right side of the backwash water system (15), and the recycled water pump (11) and the backwash water system (15) are connected through a guide pipe. 3. A wastewater treatment system for sand and gravel processing according to claim 1, characterized in that: the first grit tank (5) is connected to the second grit tank (6) through a flow pipe, so Mud scrapers are provided at the bottoms of the first grit tank (5) and the second grit tank (6). 4. A wastewater treatment system for sand and gravel processing according to claim 1, characterized in that: the grid area (3) is provided with a coarse grid pool (7) and a fine grid pool. (8), the coarse grid pool (7) and the fine grid pool (8) are equipped with slag chutes. 5. A wastewater treatment system for sand and gravel processing according to claim 1, characterized in that: the flocculation sedimentation tank (13) is provided with a flocculant dosing system, a stirring system and a mud discharge system, and a backwash water The system (16) includes a backwash water supply system, a backwash drainage system and a backwash pump station. 6. A wastewater treatment system for sand and gravel processing according to claim 1, characterized in that: the sludge treatment unit includes a backwash water system (15), and the sludge generated by the backwash water system (15) is mixed with The sludge generated in the second grit settling tank (6) and the flocculation sedimentation tank (13) enter the sludge thickening tank (16) for concentration to further remove the water in the sludge. The concentrated sludge is dehydrated through mechanical dehydration equipment (17), and the dehydrated dry sludge can be utilized as resources, such as making cement, building materials, etc. 7. A method of using a wastewater treatment system for sand and gravel processing, using the wastewater treatment system for sand and gravel processing according to any one of claims 1 to 6 for wastewater treatment, which is characterized by comprising the following steps : 1. Wastewater enters the grille area (3) from the inlet gate (2). In the grille area (3), after passing through the grille, the wastewater enters the first grit chamber (5) through the first sewage pump (4). . 2. After the first grit chamber (5), the wastewater enters the second advection grit chamber (6). In the second grit chamber (6), the wastewater passes through sedimentation and then enters the flocculation sedimentation tank (13). 3. In the flocculation sedimentation tank (13), by adding flocculant, the suspended particles in the wastewater are rapidly precipitated to form sludge. 4. The wastewater after forming sludge enters the activated carbon adsorption pool (14), and heavy metal ions and other organic pollutants in the wastewater are removed through the adsorption of activated carbon. 5. The wastewater after adsorption treatment enters the backwash water system (15), and the activated carbon is regenerated and recycled through the backwash water system. 8. The method for a wastewater treatment system for sand and gravel processing according to claim 7, characterized in that: the first grit settling tank (5) includes an advection sedimentation tank (9) and a vertical flow sedimentation tank. The pool (10) is also provided with a regulating pool (18), a water collection well (19) and a sludge concentration tank (16). The water collection well (19) is provided with two openings, and one opening flows to the advection sedimentation tank (9) , and the other opening flows to the vertical flow sedimentation tank (10). 9. A wastewater treatment system for sand and gravel processing according to claim 8, characterized in that: it is also provided with the regulating pool (18), the water collection well (19) and the sludge concentration tank (16); When the amount of mud in the water inlet gate (2) is large, the second grit chamber (6) sends the mud to the sludge concentration tank (16), and the precipitated water from the sludge concentration tank (16) is sent to The water collecting well (19) and the liquid in the regulating pool (18) are sent to the water collecting well (19), and the liquid in the water collecting well (19) is sent to the first grit settling tank (5) to settle again. 10. A wastewater treatment system for sand and gravel processing according to claim 7, characterized in that: when the amount of mud in the water inlet gate (2) is large, an advection sedimentation tank (9 ), when the amount of mud in the inlet gate (2) is small, a vertical flow sedimentation tank (10) will be used.