CN114873707B - System and method for treating, regenerating and recycling production sewage of concrete mixing station - Google Patents

Abstract

The application discloses a sewage treatment, regeneration and recycling system for a concrete mixing station, which comprises a dehydration separation system, a water storage tank and a water storage tank, wherein the dehydration separation system is used for carrying out solid-liquid separation on sewage entering the dehydration separation system, dividing the treated sewage into clear water and neutralization water, inputting the neutralization water into the carbon dioxide neutralization device, and inputting the clear water into the clear water storage tank; the carbon dioxide neutralization device is used for receiving the neutralized water input by the dehydration separation system, injecting carbon dioxide into the neutralized water, forming mixed water after the neutralized water is neutralized, and inputting the mixed water into the dehydration separation system; a closed cycle is formed between the dehydration separation system and the carbon dioxide neutralization device. The application performs neutralization treatment on the alkaline neutralization water, and establishes closed circulation between the neutralization device and the dehydration separation system, thereby avoiding the discharge of wastewater and improving the recycling ratio of sewage.

Description

System and method for treating, regenerating and recycling production sewage of concrete mixing station

Technical Field

The application relates to the field of sewage treatment of concrete mixing stations, in particular to a sewage treatment, regeneration and recycling system and method for concrete mixing stations.

Background

The production of the concrete mixing station requires a large amount of water, and a large amount of sewage generated by the concrete mixing station cannot be directly discharged. The water for the concrete mixing station is derived from underground water resources or industrial water, and the water taking cost for production is high. In order to reduce the cost of water for production, and enhance the awareness of people on environmental protection, reasonable recycling of sewage of a concrete mixing plant is required.

When sewage of the concrete mixing station is treated, the discharge of the sewage usually exists, the proportion of the discharge of the sewage can fluctuate within a certain range according to the pollution condition of the sewage, but the generation of the sewage cannot be completely avoided, the generated sewage is not only waste of water resources, but also greatly affects the environment, and environmental pollution can be formed, so that the problem to be solved in the sewage treatment field of the concrete mixing station is solved by avoiding the generation of the sewage and improving the regeneration and reuse rate of the sewage treatment water.

Disclosure of Invention

The application aims to overcome the defect that the prior art has the defects that the wastewater is discharged by people after the wastewater treatment of a concrete mixing station and cannot be recycled in a high proportion, and provides a system and a method for recycling the production wastewater of the concrete mixing station.

The aim of the application is mainly realized by the following technical scheme:

a concrete mixing station production sewage treatment regeneration recycling system comprises:

the sewage stirring pool is used for storing production sewage of the concrete mixing station;

the dehydration separation system is connected with the sewage stirring tank and is used for obtaining production sewage in the sewage stirring tank and carrying out solid-liquid separation to obtain clear water and neutralized water;

the clean water storage pool is connected with the dehydration separation system and used for obtaining and storing clean water of the dehydration separation system;

the carbon dioxide neutralization device is connected with the dehydration separation system and is used for obtaining neutralized water of the dehydration separation system, injecting carbon dioxide into the neutralized water to obtain mixed water, and returning the mixed water to the dehydration separation system;

wherein a closed cycle is formed between the dehydration separation system and the carbon dioxide neutralization device.

At present, on-site mixing building host cleaning, site flushing, environment and workshop dust fall, cement tank truck cleaning and the like of a concrete production mixing station need a large amount of water and generate a large amount of sewage. The sewage contains cement paste, aggregate and impurities, mixtures and the like carried by the aggregate, and although the solid content in the sewage can be separated through sand-stone separation equipment, the separated sewage is strongly alkaline and has a high PH value of more than 13, the direct discharge can pollute the environment, and the sewage cannot be directly used for concrete production. The current concrete production enterprises mainly adopt the following modes for sewage treatment of concrete mixing stations: firstly, the sewage after precipitation or filter pressing is mixed with a certain proportion of fresh water for reuse in production, but the mode can only be used for producing low-grade common concrete (the concrete grade is lower than C40); secondly, sewage is internally recycled after filter pressing, and the mode can only be used for tank car cleaning, site flushing and mixing floor main machine cleaning. When the internal circulation sewage cannot be fully utilized, the sewage can overflow; thirdly, the reclaimed water is recycled after PH value adjustment and oxidation treatment. At present, the pH value of the sewage in the mixing station is adjusted by adopting organic acid to neutralize the mixed sewage, then the mixed sewage is subjected to oxidation treatment by a strong oxidant (such as hydrogen peroxide), and finally the mixed sewage is subjected to shallow precipitation treatment and then is reused for production. The method can achieve the recycling of reclaimed water, but has higher cost and strong corrosiveness of the strong oxidant, and belongs to the controlled transportation products.

In order to avoid the problems that sewage overflows, waste water is still generated, the difficulty of controlling transportation objects is high, engineering danger is increased and the like when the concrete sewage is treated by adopting a conventional means, in the application, a carbon dioxide neutralization device is adopted to treat the neutralized water, and the neutralized water belongs to alkaline sewage, so that solid suspended matters are formed after carbon dioxide is introduced, impurities can be removed to form reusable clear water under the treatment of a dehydration separation system, the closed circulation between the carbon dioxide neutralization device and the dehydration separation system is effectively established, the neutralized water is completely treated to be solid and clear water in the circulation, the recycling proportion of the sewage is greatly improved, the pollution problem caused by the discharge of the waste water is avoided, meanwhile, the carbon dioxide is stable in property and low in hazard, the hazards in the neutralization process are greatly reduced, the neutralized water is treated in the circulation mode, and the clear water is stored by a storage tank independently, water resources can be effectively saved, the emission of pollutants is reduced, and the production benefit is improved; in the application, the dehydration separation system is provided with a clear water outlet pipe and a neutralization water outlet pipe, the clear water outlet pipe is connected with the clear water storage tank, the neutralization water outlet pipe is connected with the inlet of the carbon dioxide neutralization device, and the closed cycle formed between the dehydration separation system and the carbon dioxide neutralization device in the application is represented as follows: the water outlet of the carbon dioxide neutralization device is connected back to the inlet of the dehydration separation system, the neutralized water in the dehydration separation system is not discharged outwards all the time and can be converted into clear water and solid parts gradually in the closed circulation, the mixed water generated in the carbon dioxide neutralization device is dehydrated and separated again in the dehydration separation system, the clear water part is conveyed into the clear water storage tank while solids generated by the neutralization reaction are separated, and the closed circulation avoids the generation of waste water, so that the environmental pollution caused by the waste water is avoided.

Further, the clean water storage tank is connected with a multi-medium filter, the multi-medium filter is connected with a sampling box, clean water enters the sampling box through the multi-medium filter, and the water quality detection chamber is connected with the sampling box;

and a high-level tank is arranged between the sewage stirring tank and the dehydration separation system, and an outlet of the sewage stirring tank and an inlet of the dehydration separation system are communicated with the high-level tank.

Mixing station main machine cleaning sewage of the concrete mixing station, cleaning sewage of the concrete tank truck, site flushing sewage and other mixing station sewage are collected into a sewage stirring pool, and a stirrer in the sewage stirring pool periodically stirs the sewage according to set time to prevent solid matters in the sewage from depositing at the bottom of the pool; when sewage treatment is needed, the system controls a sewage pump in the sewage stirring pool to pump sewage into the overhead tank, and then a feed pump of the dehydration separation system pumps the sewage into the dehydration separation system from the overhead tank for solid-liquid separation. The separated filtrate flows into the carbon dioxide neutralizing device from the sewage filtrate outlet. The mud cake produced after separation is conveyed to a stock yard and can be used as brick making raw materials or foundation backfill. When the reclaimed water in the clean water storage tank needs to be treated, the submersible pump in the clean water storage tank pumps the reclaimed water into the multi-medium filter for deep filtration and COD removal in the water, and the reclaimed water finally flows into the sampling box from the water outlet of the multi-medium filter. The water quality detection instrument in the sampling box monitors the water quality condition. When the water quality meets the detection requirement, the reclaimed water flows into the reclaimed water pipe from the sampling box for reuse or flows into the outer drain pipe for discharge.

Further, the carbon dioxide neutralization device comprises a device shell, a carbon dioxide storage tank capable of injecting carbon dioxide into the device shell is arranged on the side face of the device shell, a neutralization water inlet pipe and a water outlet pipe are arranged on the device shell, the water outlet pipe is located at the upper half part of the device shell, the neutralization water inlet pipe is located at the lower half part of the device shell, a plurality of groups of flow guide partition plates are arranged in the device shell and are horizontally arranged and evenly distributed from bottom to top, and the flow guide partition plates can guide the flow direction of the neutralization water and increase the flow length of the neutralization water.

In the application, the water outlet pipe is positioned at the upper half part of the device shell, the neutralizing water inlet pipe is positioned at the lower half part of the device shell, thus neutralizing water can be conveyed in a mode from bottom to top, the neutralizing water can be fully contacted with carbon dioxide to achieve the aim of neutralizing alkaline substances in the neutralizing water, the guide baffle plate arranged in the application lengthens the flowing length of the neutralizing water in the carbon dioxide neutralizing device and also increases the contact reaction time of the carbon dioxide and the neutralizing water, thus the neutralizing water can be fully reacted, the guide baffle plates are horizontally arranged and uniformly distributed from bottom to top, the flowing length of the neutralizing water is effectively prolonged, and when a plurality of groups of guide baffle plates are arranged, the flowing process of the neutralizing water is arranged in a snake shape, so that carbon dioxide can be fully dissolved in the neutralizing water and the neutralizing reaction can be generated.

Further, the guide partition plate comprises a first partition plate and a second partition plate, the first partition plate and the second partition plate are parallel to each other, the first partition plate and the second partition plate are fixed with the device shell, a first gap is reserved between the first partition plate and the device shell, a second gap is reserved between the second partition plate and the device shell, the first gap is close to the side face of the device shell where the position of the neutralization water inlet pipe is opposite, and the second gap is close to the side face of the device shell where the neutralization water inlet pipe is located.

According to the application, the first notch on the first partition plate and the second notch on the second partition plate are staggered, so that the flowing path of the neutralization water becomes a snake shape, and the neutralization water can reach the position of the water outlet pipe through a longer path, thereby enabling the neutralization reaction to be more sufficient.

Further, a carbon dioxide injection plate is arranged at the first notch, a plurality of through holes which are uniformly distributed are formed in the surface of the carbon dioxide injection plate, carbon dioxide is injected into the through holes from the carbon dioxide storage tank, and the neutralizing water can pass through the carbon dioxide injection plate from the through holes.

According to the application, carbon dioxide is injected into the neutralization water through the carbon dioxide injection plate provided with the through holes, and the neutralization water also passes through the carbon dioxide injection plate through the through holes on the carbon dioxide injection plate, so that the carbon dioxide and the neutralization water can be mixed more uniformly, and the neutralization reaction can be carried out more thoroughly.

Further, the carbon dioxide injection plate comprises a plate body, the through-hole link up the plate body and evenly distributed is on the plate body be equipped with the gas injection pipe in the plate body, gas injection pipe and carbon dioxide storage tank intercommunication are equipped with the blast pipe in the plate body, be equipped with the bearing between blast pipe and the gas injection pipe, the one end and the blast pipe of bearing are fixed, and its other end is fixed with the gas injection pipe be equipped with a plurality of exhaust holes on the blast pipe, the exhaust hole is equipped with the baffle in the blast pipe with screw thread form evenly distributed on the blast pipe, it has the screw thread chamber to open on the baffle, the screw thread chamber is along the position distribution in exhaust hole, screw thread chamber and gas injection pipe intercommunication.

The exhaust pipe in the carbon dioxide injection plate can stir the neutralization water liquid in the plate body through the threaded gas discharge, so that the reaction rate of the neutralization reaction is accelerated, the threaded cavity on the current carrier can drive the exhaust pipe to rotate relative to the gas injection pipe during the injection of carbon dioxide, so that the discharged carbon dioxide is distributed more uniformly, and the partial stirring of the liquid in the plate body can be further driven to accelerate the neutralization reaction.

Further, a flow control plate is arranged at the second notch, and the flow control plate can increase or decrease the flow area of the neutralization water at the second notch.

The pH value of the neutralized water is not necessarily constant, but the pH value of the mixed water at the water outlet pipe is required to be regulated within a constant range, so that the regulation of the carbon dioxide injection amount and the regulation of the reaction degree are required.

Further, the flow control plate comprises an annular frame, the annular frame is fixed with the device shell, a plurality of lower control plates are arranged on the annular frame, and the lower control plates completely cover the annular frame.

The flow control plate does not need to completely seal the second notch and prevent the flow of the neutralization water, so that the annular frame is arranged, the minimum flow area of the neutralization water at the second notch is ensured, the probability of turbulence, turbulent flow and other problems in the fluid flow can be reduced to a certain extent by the annular frame, and local blockage is avoided.

Further, the lower control board comprises a fixed rotating head, an arc-shaped track is arranged on the fixed rotating head, a sliding column is embedded in the arc-shaped track and can freely slide along the arc-shaped track, a baffle is arranged on the fixed rotating head, a support rod is arranged between the sliding column and the baffle, one end of the support rod is fixed with the baffle, and the other end of the support rod is fixed with the sliding column;

an arc-shaped cavity is arranged in the fixed rotating head, the position and the size of the arc-shaped cavity correspond to those of the arc-shaped track, and the sliding column is embedded in the arc-shaped cavity;

the arc-shaped cavity is connected with a sealing cavity, a piston is arranged in the sealing cavity, a telescopic rod is fixed on the piston, the telescopic rod is fixed with the sealing cavity, a corrugated pipe is arranged at the joint of the sealing cavity and the arc-shaped cavity, one end of the corrugated pipe is fixed with the sliding column, and the other end of the corrugated pipe is fixed and communicated with the sealing cavity.

In the application, the arc track on the fixed rotating head can limit the movement track of the sliding column, the sliding column can reciprocate along the direction of the arc track and the arc cavity by the expansion and contraction of the corrugated pipe driven by the piston, and the piston is positioned in the sealing cavity, so that the piston can move under the drive of the telescopic rod to drive the expansion and contraction of the corrugated pipe, thereby achieving the purpose of pushing the sliding column, and the sliding column can drive the baffle to rotate through the supporting rod in the movement process, thereby adjusting the flow area of the neutralized water, and achieving the purpose of adjusting the neutralized water flow.

The method for treating, regenerating and recycling the production sewage of the concrete mixing station comprises the following specific steps:

adopting the system for treating, regenerating and recycling the production sewage of the concrete mixing station to treat the sewage of the concrete mixing station, and obtaining clean water injected into the clean water storage tank and neutralizing water input into a carbon dioxide neutralizing device after dehydration;

injecting carbon dioxide gas into the carbon dioxide neutralization device, and adjusting the carbon dioxide injection speed and the flow speed of the neutralization water in the carbon dioxide neutralization device according to the pH value of the mixed water in the carbon dioxide neutralization device;

when the PH value of the mixed water is monitored to be higher than 8.5, the carbon dioxide injection is quickened and the flow rate of the neutralization water is slowed down; and when the PH value of the mixed water is monitored to be lower than 6, slowing down the injection of carbon dioxide and accelerating the flow rate of the neutralized water.

At present, when carrying out concrete mixing station production sewage treatment, the speed of neutralization reaction is always invariable in the neutralization water, but the PH value of the neutralization water is not invariable when facing different batches of sewage, so the PH value of the mixed water adjusted by the neutralization reaction is always not invariable, reworking treatment is required, manpower and material resources are wasted greatly, and the working efficiency is reduced.

According to the application, the condition that the neutralization reaction is incomplete can be effectively improved by controlling the injection speed of carbon dioxide and the flow rate of the neutralization water, and the mixed water reaching the standard can be obtained at one time.

In summary, compared with the prior art, the application has the following beneficial effects:

(1) The application effectively establishes the closed circulation between the carbon dioxide neutralization device and the dehydration separation system, so that the neutralized water is completely treated into solid and clear water in the circulation, the regeneration and reuse proportion of sewage is greatly improved, the pollution problem caused by wastewater discharge is avoided, and meanwhile, the carbon dioxide is stable in property and less in hazard, and therefore, the carbon dioxide is not a controlled transportation product, and the hazard in the neutralization process is greatly reduced.

(2) The guide partition plates are horizontally arranged and uniformly distributed from bottom to top, so that the flowing length of the neutralizing water in the carbon dioxide neutralizing device is effectively prolonged.

(3) The exhaust pipe in the carbon dioxide injection plate can stir the neutralization water liquid in the plate body through the threaded gas discharge, so that the reaction rate of the neutralization reaction is accelerated, the threaded cavity on the current carrier can drive the exhaust pipe to rotate relative to the gas injection pipe during the injection of carbon dioxide, so that the discharged carbon dioxide is distributed more uniformly, and the partial stirring of the liquid in the plate body can be further driven to accelerate the neutralization reaction.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

FIG. 1 is a schematic diagram of a system architecture of the present application;

FIG. 2 is a schematic diagram of a carbon dioxide neutralization apparatus according to the present application;

FIG. 3 is a schematic view of a carbon dioxide injection plate structure according to the present application;

FIG. 4 is a cross-sectional view of a carbon dioxide injection plate of the present application;

FIG. 5 is a cross-sectional view of an exhaust pipe of the present application;

FIG. 6 is a schematic diagram of a flow control plate structure according to the present application;

FIG. 7 is a schematic view of the connection structure of the ring frame and the lower control board of the present application;

FIG. 8 is a schematic view of the lower control panel structure of the present application;

FIG. 9 is a side cross-sectional view of the lower control panel of the present application;

the reference numerals in the present application are as follows: 1. a sewage stirring tank; 2. a dewatering separation system; 3. a carbon dioxide neutralization device; 4. a clean water storage pool; 5. a multi-media filter; 6. a high tank; 7. a water quality detection chamber; 8. sampling box; 31. a device housing; 32. a carbon dioxide storage tank; 33. a carbon dioxide injection plate; 34. a first partition plate; 35. a second partition plate; 36. a neutralized water inlet pipe; 37. a flow control plate; 38. a water outlet pipe; 331. a plate body; 332. a through hole; 333. a bearing; 334. an air injection pipe; 335. an exhaust hole; 336. an exhaust pipe; 337. a threaded cavity; 338. a flow guide body; 371. an annular frame; 372. a lower control board; 3721. fixing the rotating head; 3722. a baffle; 3723. an arc-shaped track; 3724. a sliding column; 3725. a support rod; 3726. a telescopic rod; 3727. an arc-shaped cavity; 3728. a bellows; 3729. a piston; 3720. sealing the cavity.

Detailed Description

For the purpose of making apparent the objects, technical solutions and advantages of the present application, the present application will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present application and the descriptions thereof are for illustrating the present application only and are not to be construed as limiting the present application.

Examples:

as shown in fig. 1 to 9, the present embodiment relates to a system for treating, regenerating and recycling production sewage of a concrete mixing station, including:

the sewage stirring pool 1 is used for storing production sewage of the concrete mixing station;

the dehydration separation system 2 is connected with the sewage stirring tank 1 and is used for acquiring production sewage in the sewage stirring tank 1 and carrying out solid-liquid separation to acquire clear water and neutralized water;

the clean water storage pool 4 is connected with the dehydration separation system 2 and is used for acquiring and storing clean water of the dehydration separation system 2;

the carbon dioxide neutralization device 3 is connected with the dehydration separation system 2 and is used for obtaining neutralized water of the dehydration separation system 2, injecting carbon dioxide into the neutralized water to obtain mixed water, and returning the mixed water to the dehydration separation system 2;

wherein a closed cycle is formed between the dehydration separation system 2 and the carbon dioxide neutralization device 3.

The clean water storage tank 4 is connected with a multi-medium filter 5, the multi-medium filter 5 is connected with a sampling box 8, clean water enters the sampling box 8 through the multi-medium filter 5, and the water quality detection chamber 7 is connected with the sampling box 8;

a high-level tank 6 is arranged between the sewage stirring tank 1 and the dehydration separation system 2, and the outlet of the sewage stirring tank 1 and the inlet of the dehydration separation system 2 are communicated with the high-level tank 6.

The carbon dioxide neutralization device 3 comprises a device shell 31, a carbon dioxide storage tank 32 capable of injecting carbon dioxide into the device shell 31 is arranged on the side face of the device shell 31, a neutralization water inlet pipe 36 and a water outlet pipe 38 are arranged on the device shell 31, the water outlet pipe 38 is located on the upper half portion of the device shell 31, the neutralization water inlet pipe 36 is located on the lower half portion of the device shell 31, a plurality of groups of flow guide partition plates are arranged in the device shell 31, are horizontally arranged and uniformly distributed from bottom to top, and can guide the flow direction of the neutralization water and increase the flow length of the neutralization water.

The flow guide partition plate comprises a first partition plate 34 and a second partition plate 35, the first partition plate 34 and the second partition plate 35 are parallel to each other, the first partition plate 34 and the second partition plate 35 are fixed with the device housing 31, a first gap is reserved between the first partition plate 34 and the device housing 31, a second gap is reserved between the second partition plate 35 and the device housing 31, the first gap is close to the side face of the device housing 31 where the neutral water inlet pipe 36 is located, and the second gap is close to the side face of the device housing 31 where the neutral water inlet pipe 36 is located.

A carbon dioxide injection plate 33 is arranged at the first notch, a plurality of through holes 332 which are uniformly distributed are arranged on the surface of the carbon dioxide injection plate 33, carbon dioxide is injected into the through holes 332 by the carbon dioxide storage tank 32, and the neutralizing water can pass through the carbon dioxide injection plate 33 from the through holes 332.

The carbon dioxide injection plate 33 comprises a plate body 331, the through holes 332 penetrate through the plate body 331 and are uniformly distributed on the plate body 331, an air injection pipe 334 is arranged in the plate body 331, the air injection pipe 334 is communicated with the carbon dioxide storage tank 32, an exhaust pipe 336 is arranged in the plate body 331, a bearing 333 is arranged between the exhaust pipe 336 and the air injection pipe 334, one end of the bearing 333 is fixed with the exhaust pipe 336, the other end of the bearing 333 is fixed with the air injection pipe 334, a plurality of exhaust holes 335 are formed in the exhaust pipe 336, the exhaust holes 335 are uniformly distributed on the exhaust pipe 336 in a threaded mode, a guide body 338 is arranged in the exhaust pipe 336, a threaded cavity 337 is formed in the guide body 338, the threaded cavity 337 is distributed along the position of the exhaust holes 335, and the threaded cavity 337 is communicated with the air injection pipe 334.

A flow control plate 37 is provided at the second notch, and the flow control plate 37 can increase or decrease the flow area of the neutralization water at the second notch.

The flow control plate 37 includes an annular frame 371, the annular frame 371 is fixed with the device housing 31, a plurality of lower control plates 372 are provided on the annular frame 371, and the lower control plates 372 completely cover the annular frame 371.

The lower control plate 372 comprises a fixed rotating head 3721, an arc-shaped track 3723 is arranged on the fixed rotating head 3721, a sliding column 3724 is embedded in the arc-shaped track 3723, the sliding column 3724 can slide freely along the arc-shaped track 3723, a baffle 3722 is arranged on the fixed rotating head 3721, a supporting rod 3725 is arranged between the sliding column 3724 and the baffle 3722, one end of the supporting rod 3725 is fixed with the baffle 3722, and the other end of the supporting rod 3725 is fixed with the sliding column 3724;

an arc-shaped cavity 3727 is arranged in the fixed rotating head, the position and the size of the arc-shaped cavity 3727 correspond to those of the arc-shaped track 3723, and the sliding column 3724 is embedded in the arc-shaped cavity 3727;

the arc-shaped cavity 3727 is connected with a sealing cavity 3720, a piston 3729 is arranged in the sealing cavity 3720, a telescopic rod 3726 is fixed on the piston 3729, the telescopic rod 3726 is fixed with the sealing cavity 3720, a corrugated pipe 3728 is arranged at the joint of the sealing cavity 3720 and the arc-shaped cavity 3727, one end of the corrugated pipe 3728 is fixed with the sliding column 3724, and the other end of the corrugated pipe 3728 is fixed with and communicated with the sealing cavity 3720.

In the embodiment, the carbon dioxide neutralization device 3 is adopted to treat the neutralized water, and because the neutralized water belongs to alkaline sewage, solid suspended matters are formed after the carbon dioxide is introduced, impurities can be removed to form clear water which can be reused under the treatment of the dehydration separation system 2, and the application effectively establishes closed circulation between the carbon dioxide neutralization device 3 and the dehydration separation system 2, so that the neutralized water is completely treated to be solid and clear water in the circulation, the regeneration and reuse proportion of sewage is greatly improved, the pollution problem caused by the discharge of waste water is avoided, meanwhile, because the carbon dioxide is stable in property and less in hazard, the danger in the neutralization process is greatly reduced, the neutralized water is circulated and the clear water is stored by a clear water storage tank alone, the water resource can be effectively saved, the emission of pollutants is reduced, the raw material utilization rate is improved, and the production benefit can also be improved.

The water outlet pipe 38 is positioned at the upper half part of the device shell 31, the neutralization water inlet pipe 36 is positioned at the lower half part of the device shell 31, so that the neutralization water can be conveyed in a bottom-to-top mode, the neutralization water can be fully contacted with carbon dioxide to achieve the aim of neutralizing alkaline substances in the neutralization water, and the guide baffle plate provided by the application prolongs the flowing length of the neutralization water in the carbon dioxide neutralization device and increases the contact reaction time of the carbon dioxide and the neutralization water, so that the neutralization water can be fully reacted, and the guide baffle plate is horizontally arranged and uniformly distributed from bottom to top, thereby effectively prolonging the flowing length in the application.

The first notch on the first partition plate 34 and the second notch on the second partition plate 35 are staggered in this embodiment, so that the flow path of the neutralization water becomes serpentine, and the neutralization water needs to pass through a longer path to reach the position of the water outlet pipe 38, so that the neutralization reaction is more sufficient.

In this embodiment, carbon dioxide is injected into the neutralization water through the carbon dioxide injection plate 33 provided with the through holes 332, and the neutralization water also passes through the carbon dioxide injection plate 33 through the through holes 332 on the carbon dioxide injection plate 33, so that the mixing of carbon dioxide and the neutralization water can be more uniform, and the neutralization reaction can be more thoroughly performed.

The exhaust pipe 336 in the carbon dioxide injection plate 33 in this embodiment can stir the neutralizing water liquid in the plate 331 through the screw-shaped gas discharge, so that the reaction rate of the neutralization reaction is accelerated, and the screw cavity 337 on the guide body 338 can push the exhaust pipe 336 to rotate relative to the gas injection pipe 334 when injecting carbon dioxide, so that the discharged carbon dioxide is distributed more uniformly, and can further drive the local stirring of the liquid in the plate 331 to accelerate the neutralization reaction.

The ph of the neutralized water in this embodiment is not necessarily constant, but the ph of the mixed water at the water outlet pipe 38 needs to be adjusted within a constant range, so that adjustment of the carbon dioxide injection amount and adjustment of the reaction degree are required.

The flow control plate 37 in this embodiment does not need to completely seal the second gap and prevent the flow of the neutralized water, so that the annular frame 371 is provided to ensure the minimum flow area of the neutralized water at the second gap, and the annular frame 371 can also reduce the probability of turbulence, turbulence and other problems in the fluid flow to a certain extent, so as to avoid local blockage.

The arc track 3723 on the fixed rotating head 3721 can limit the movement track of the sliding column 3724, the rotation of the baffle 3722 drives the expansion and contraction of the corrugated pipe 3728 through the piston 3729, so that the sliding column 3724 can reciprocate along the directions of the arc track 3723 and the arc cavity 3727, the piston 3729 is positioned in the sealing cavity 3720, the piston 3729 can drive the expansion and contraction of the corrugated pipe 3728 under the driving of the telescopic rod 3726, the purpose of pushing the sliding column 3724 is achieved, the sliding column 3724 can drive the baffle 3722 to rotate through the supporting rod 3725 in the movement process, the flow area of the neutralized water is regulated, and the purpose of regulating the neutralized water flow is achieved

In this embodiment, only one piston 3729 is provided, but bellows 3728 are provided on both sides of the seal chamber 3720, and arc chamber 3727, sliding column 3724, arc track 3723 and support rod 3725 are provided in a matched manner, so that when piston 3729 moves, bellows 3728 on both sides can be synchronously stretched, and when bellows 3728 on one side stretches, bellows 3728 on the other side contracts, so that two sliding columns 3724 can cooperate with rotating baffle 3722, so that the on-duty rotation is more stable, and because the working environment of flow control plate 37 is in alkaline solution, the adjustment failure caused by corrosion of movable components can be avoided in a stretching manner of bellows 3728, thereby guaranteeing the stability of flow adjustment.

The method for treating, regenerating and recycling the production sewage of the concrete mixing station comprises the following specific steps:

adopting a concrete mixing station production sewage treatment regeneration recycling system to treat the concrete mixing station sewage, and obtaining clear water injected into the clear water storage tank 4 and neutralizing water input into the carbon dioxide neutralizing device 3 after dehydration;

injecting carbon dioxide gas into the carbon dioxide neutralization device 3, and adjusting the carbon dioxide injection speed and the flow speed of the neutralization water in the carbon dioxide neutralization device 3 according to the PH value of the mixed water in the carbon dioxide neutralization device 3;

when the PH value of the mixed water is monitored to be higher than 8.5, the carbon dioxide injection is quickened and the flow rate of the neutralization water is slowed down; and when the PH value of the mixed water is monitored to be lower than 6, slowing down the injection of carbon dioxide and accelerating the flow rate of the neutralized water.

In this embodiment, by controlling the injection speed of carbon dioxide and the flow rate of the neutralization water, the condition that the neutralization reaction is not thorough can be effectively improved, and the mixed water reaching the standard can be obtained at one time.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.

Claims (2)

1. A concrete mixing station production sewage treatment regeneration recycling system comprises:

the sewage stirring pool (1) is used for storing production sewage of the concrete mixing station;

it is characterized in that the method comprises the steps of,

the dehydration separation system (2) is connected with the sewage stirring tank (1) and is used for obtaining production sewage in the sewage stirring tank (1) and carrying out solid-liquid separation to obtain clear water and neutralized water;

the clean water storage pool (4) is connected with the dehydration separation system (2) and is used for acquiring and storing clean water of the dehydration separation system (2);

the carbon dioxide neutralization device (3) is connected with the dehydration separation system (2) and is used for obtaining neutralized water of the dehydration separation system (2), injecting carbon dioxide into the neutralized water to obtain mixed water, and returning the mixed water to the dehydration separation system (2);

wherein a closed cycle is formed between the dehydration separation system (2) and the carbon dioxide neutralization device (3);

the carbon dioxide neutralization device (3) comprises a device shell (31), a carbon dioxide storage tank (32) capable of injecting carbon dioxide into the device shell (31) is arranged on the side surface of the device shell (31), a neutralization water inlet pipe (36) and a water outlet pipe (38) are arranged on the device shell (31), the water outlet pipe (38) is positioned at the upper half part of the device shell (31), the neutralization water inlet pipe (36) is positioned at the lower half part of the device shell (31), a plurality of groups of flow guide baffles are arranged in the device shell (31), are horizontally arranged and are uniformly distributed from bottom to top, and can guide the flow direction of the neutralization water and increase the flow length of the neutralization water;

the clean water storage tank (4) is connected with a multi-medium filter (5), the multi-medium filter (5) is connected with a sampling box (8), clean water enters the sampling box (8) through the multi-medium filter (5), and the water quality detection chamber (7) is connected with the sampling box (8);

a high-level tank (6) is arranged between the sewage stirring tank (1) and the dehydration separation system (2), and an outlet of the sewage stirring tank (1) and an inlet of the dehydration separation system (2) are both communicated with the high-level tank (6);

the flow guide partition plate comprises a first partition plate (34) and a second partition plate (35), the first partition plate (34) and the second partition plate (35) are parallel to each other, the first partition plate (34) and the second partition plate (35) are both fixed with the device shell (31), a first gap is reserved between the first partition plate (34) and the device shell (31), a second gap is reserved between the second partition plate (35) and the device shell (31), the first gap is close to the side face of the device shell (31) where the neutralization water inlet pipe (36) is located, and the second gap is close to the side face of the device shell (31) where the neutralization water inlet pipe (36) is located;

a carbon dioxide injection plate (33) is arranged at the first notch, a plurality of through holes (332) which are uniformly distributed are formed in the surface of the carbon dioxide injection plate (33), carbon dioxide is injected into the through holes (332) by the carbon dioxide storage tank (32), and the neutralizing water can pass through the carbon dioxide injection plate (33) from the through holes (332);

the carbon dioxide injection plate (33) comprises a plate body (331), the through holes (332) penetrate through the plate body (331) and are uniformly distributed on the plate body (331), an air injection pipe (334) is arranged in the plate body (331), the air injection pipe (334) is communicated with a carbon dioxide storage tank (32), an exhaust pipe (336) is arranged in the plate body (331), a bearing (333) is arranged between the exhaust pipe (336) and the air injection pipe (334), one end of the bearing (333) is fixed with the exhaust pipe (336), the other end of the bearing (333) is fixed with the air injection pipe (334), a plurality of exhaust holes (335) are formed in the exhaust pipe (336), the exhaust holes (335) are uniformly distributed on the exhaust pipe (336) in a threaded mode, a guide body (338) is arranged in the exhaust pipe (336), threaded cavities (337) are formed in the guide body (338), and the threaded cavities (337) are distributed along the positions of the exhaust holes (335), and the threaded cavities (337) are communicated with the air injection pipe (334);

a flow control plate (37) is arranged at the second notch, and the flow control plate (37) can increase or decrease the flow area of the neutralization water at the second notch;

the flow control plate (37) comprises an annular frame (371), the annular frame (371) is fixed with the device shell (31), a plurality of lower control plates (372) are arranged on the annular frame (371), and the annular frame (371) is completely covered by the lower control plates (372);

the lower control plate (372) comprises a fixed rotating head (3721), an arc-shaped track (3723) is arranged on the fixed rotating head (3721), a sliding column (3724) is embedded in the arc-shaped track (3723), the sliding column (3724) can freely slide along the arc-shaped track (3723), a baffle (3722) is arranged on the fixed rotating head (3721), a supporting rod (3725) is arranged between the sliding column (3724) and the baffle (3722), one end of the supporting rod (3725) is fixed with the baffle (3722), and the other end of the supporting rod is fixed with the sliding column (3724);

an arc-shaped cavity (3727) is arranged in the fixed rotating head (3721), the position and the size of the arc-shaped cavity (3727) correspond to those of the arc-shaped track (3723), and the sliding column (3724) is embedded in the arc-shaped cavity (3727);

the novel sliding column is characterized in that the arc-shaped cavity (3727) is connected with a sealing cavity (3720), a piston (3729) is arranged in the sealing cavity (3720), a telescopic rod (3726) is fixed on the piston (3729), the telescopic rod (3726) is fixed with the sealing cavity (3720), a corrugated pipe (3728) is arranged at the joint of the sealing cavity (3720) and the arc-shaped cavity (3727), one end of the corrugated pipe (3728) is fixed with the sliding column (3724), and the other end of the corrugated pipe is fixed with and communicated with the sealing cavity (3720).

2. A method for treating, regenerating and recycling production sewage of a concrete mixing station is characterized by comprising the following specific steps:

adopting the system for treating, regenerating and recycling the production sewage of the concrete mixing station according to claim 1 to treat the sewage of the concrete mixing station, and obtaining clean water injected into the clean water storage tank (4) and neutralizing water input into the carbon dioxide neutralizing device (3) after dehydration;

injecting carbon dioxide gas into the carbon dioxide neutralization device (3), and adjusting the carbon dioxide injection speed and the flow speed of the neutralization water in the carbon dioxide neutralization device (3) according to the PH value of the mixed water in the carbon dioxide neutralization device (3);

when the PH value of the mixed water is monitored to be higher than 8.5, the carbon dioxide injection is quickened and the flow rate of the neutralization water is slowed down; and when the PH value of the mixed water is monitored to be lower than 6, slowing down the injection of carbon dioxide and accelerating the flow rate of the neutralized water.