Concrete plant wastewater purification system and method

Abstract

The invention discloses a concrete factory wastewater purification system and method.The concrete factory wastewater purification system comprises a composite filtering pretreatment unit, an efficient flocculation reaction unit, an ion exchange and adsorption treatment unit and a cyclic utilization and discharge monitoring unit which are sequentially connected, and the composite filtering pretreatment unit comprises a vibration screening module and a magnetic adsorption filtering module; a wastewater flow monitoring device is arranged between the vibration screening module and the magnetic adsorption filtering module, and an ultrasonic generator is arranged in the magnetic adsorption filtering module; the efficient flocculation reaction unit comprises an automatic flocculant adding device, a multi-stage stirring reaction tank and an inclined tube precipitator; the ion exchange and adsorption treatment unit comprises an ion exchange resin column and an activated carbon adsorption tower which are connected in series; and the recycling and discharging monitoring unit comprises a clean water tank, a recycling water pump and a water quality monitoring sensor. The ion exchange and adsorption treatment unit adopts a gradient adsorption bed structure, the upper layer of the gradient adsorption bed structure is filled with a large-particle-size adsorption material which can quickly intercept suspended particles and colloidal substances in wastewater, and ion exchange resin in the middle layer can effectively remove heavy metal ions and soluble salts; and the nanoscale adsorption material on the lower layer deeply adsorbs organic matters, pigments and peculiar smell substances by virtue of the huge specific surface area of the nanoscale adsorption material.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater purification and recycling treatment. Specifically, it relates to a wastewater purification system and method for a concrete plant area. Background Art

[0002] A concrete plant area, also known as a concrete mixing plant, is a site where concrete is mixed using a concrete mixing station. Its main function is to mix raw materials such as cement, aggregates, and water through professional equipment and processes to produce concrete that meets construction requirements. The sewage in the concrete plant area mainly comes from wastewater generated during the production process, including wastewater generated from the separation of waste concrete, washing water for production and transportation equipment, and flushing water for the production site. If these wastewaters are directly discharged without proper treatment, they may cause environmental pollution. Therefore, it is necessary to use wastewater treatment devices to purify the wastewater. At the same time, the separated metals and water after treatment can be reused multiple times to save resource costs.

[0003] When the existing wastewater treatment devices for concrete plant areas are in use, a certain amount of coarse materials will be mixed in the concrete wastewater. If the wastewater is uniformly purified without pre - treating the coarse materials first, these large - sized coarse materials will damage the equipment during the wastewater treatment process, and will also cause blockages, affecting the wastewater treatment efficiency and delaying the wastewater treatment process, which is not conducive to the progress of concrete wastewater treatment work. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a wastewater purification system and method for a concrete plant area.

[0005] To achieve the above object, the technical solution of the present invention is: A wastewater purification system for a concrete plant area includes a composite filtration and pretreatment unit, a high - efficiency flocculation reaction unit, an ion exchange and adsorption treatment unit, and a recycling and discharge monitoring unit that are connected in sequence. The composite filtration and pretreatment unit includes a vibration screening module and a magnetic adsorption filtration module. A wastewater flow monitoring device is provided between the vibration screening module and the magnetic adsorption filtration module, and an ultrasonic generator is provided inside the magnetic adsorption filtration module;

[0006] The high - efficiency flocculation reaction unit includes a flocculant automatic dosing device, a multi - stage stirring reaction tank, and a inclined tube settler;

[0007] The ion exchange and adsorption treatment unit includes a series - connected ion exchange resin column and an activated carbon adsorption tower;

[0008] The recycling and discharge monitoring unit includes a clear water tank, a recycled water pump, and a water quality monitoring sensor.

[0009] Further, the vibration screening module includes multiple layers of screens with decreasing pore sizes and high-frequency vibration motors, and the pore sizes of the multiple layers of screens in the vibration screening module gradually decrease from top to bottom.

[0010] Further, the automatic flocculant dosing device is communicatively connected to the wastewater flow monitoring device and the water quality detection device.

[0011] Further, multiple groups of stirring paddles in the stirring reaction tank are arranged at different heights and angles to achieve stirring at different levels and directions.

[0012] Further, the stirring paddles of the stirring reaction tank adopt main stirring and secondary stirring. The main stirring shaft is equipped with Archimedes spiral blades, and the secondary stirring shaft is provided with radial shear blades. The rotation speed is divided into two stages: rapid mixing and slow flocculation.

[0013] Further, the ion exchange and adsorption treatment unit adopts a gradient adsorption bed structure. The ion exchange resin column and the activated carbon adsorption tower are internally filled with multiple layers of adsorption materials with different particle sizes, forming a gradient filtration layer from thick to fine to improve the pollutant interception efficiency.

[0014] The present invention also provides a method for purifying wastewater in a concrete factory area, including the following steps:

[0015] (1) Wastewater collection and preliminary adjustment: Collect the wastewater in the concrete factory area through pipelines to the adjustment tank, and adjust the pH value, temperature and flow rate of the wastewater in the adjustment tank to meet the set operating conditions of the subsequent treatment unit;

[0016] (2) Composite filtration pretreatment: The adjusted wastewater sequentially enters the vibration screening module and the magnetic adsorption filtration module to remove large particle impurities and magnetic pollutants;

[0017] (3) High-efficiency flocculation reaction: The pretreated wastewater enters the stirring reaction tank, and the automatic flocculant dosing device adds flocculant according to a preset program. The stirring paddles quickly stir to fully mix the flocculant with the wastewater, and the flocs generated by the reaction precipitate and separate in the inclined tube sedimentation tank;

[0018] (4) Ion exchange and adsorption depth treatment: The supernatant after precipitation enters the ion exchange resin column to remove heavy metal ions and soluble salts, and then enters the activated carbon adsorption tower to adsorb organic substances and odor substances;

[0019] (5) Recycling and discharge monitoring: The deeply purified water enters the clean water tank, and the reuse water pump transports it to the production link for recycling. The water quality monitoring sensor real-time monitors the water quality of the clean water tank. When the water quality is abnormal, start the emergency treatment process.

[0020] Further, in the wastewater collection and preliminary regulation step, the pH value of the wastewater is adjusted to 6 - 9 by adding acid-base regulators.

[0021] Further, in the high-efficiency flocculation reaction step, the stirring paddle first stirs rapidly at a speed of 100 - 150 r / min for 1 - 2 min, and then stirs slowly at a speed of 30 - 50 r / min for 10 - 15 min.

[0022] Further, in the ion exchange and adsorption advanced treatment step, the residence times of the supernatant in the ion exchange resin column and the activated carbon adsorption tower are controlled to be 15 - 30 min and 20 - 40 min respectively.

[0023] After adopting the above technical solution, a concrete plant wastewater purification system and method provided by the present invention have the following beneficial effects compared with the prior art.

[0024] (1) The composite filtration pretreatment unit of the present invention can separate large-particle sand, impurities and magnetic pollutants through the vibration screening module and the magnetic adsorption filtration module; the high-efficiency flocculation reaction unit can make the flocculant fully mix and react with the wastewater, effectively removing various pollutants; the ion exchange resin column can remove heavy metal ions and some soluble salts, and the activated carbon adsorption tower can adsorb organic matters, pigments and odor substances. Through the synergistic effect of these processes, various pollutants in the concrete plant wastewater can be removed more comprehensively, making the treated water quality meet the requirements of recycling and discharge standards.

[0025] (2) The treatment efficiency is effectively improved through unique design. The high-frequency vibration of the vibration screening module speeds up the separation speed of large-particle impurities, and the inclined tube sedimentation tank utilizes the principle of shallow sedimentation to speed up the sedimentation speed of flocs. At the same time, the automatic flocculant dosing device can accurately dose the flocculant according to the flow rate and pollutant concentration of the wastewater, and multiple groups of stirring paddles with different rotation speeds in the stirring reaction tank achieve the full mixing and reaction of the flocculant and the wastewater, improving the flocculation reaction efficiency.

[0026] (3) Precise control of flocculant dosing reduces unnecessary consumption of chemicals; the wastewater can be recycled after treatment, reducing waste of water resources and the demand for fresh water resources, thereby reducing the production cost of the concrete plant. The system is also equipped with energy recovery devices, such as wastewater waste heat recovery devices and kinetic energy recovery devices for the vibration screening module, which convert energy into electric energy for system use, further reducing the operating cost.

[0027] The following further describes in detail the specific implementation manners of the present invention with reference to the drawings. Description of the Drawings

[0028] The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0029] Figure 1 It is a schematic diagram of the system composition of the present invention.

[0030] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise clearly and specifically defined.

[0035] Such as Figure 1As shown in the figure, a waste water purification system for a concrete plant area provided by the present invention mainly includes a composite filtration pretreatment unit, a high-efficiency flocculation reaction unit, an ion exchange and adsorption treatment unit, and a recycling and discharge monitoring unit that are connected in sequence.

[0036] Furthermore, the composite filtration pretreatment unit includes a vibration screening module and a magnetic adsorption filtration module; the vibration screening module is provided with multiple layers of screens with different pore sizes and a vibration motor, and the vibration motor is used to generate high-frequency vibrations to preliminarily screen the waste water, separating out large-particle sand and impurities. The magnetic adsorption filtration module uses magnetic adsorption materials to adsorb magnetic pollutants in the waste water;

[0037] The high-efficiency flocculation reaction unit consists of a flocculant automatic dosing device, a stirring reaction tank, and an inclined tube sedimentation tank. The flocculant automatic dosing device is used to accurately dose flocculants according to the flow rate and pollutant concentration of the waste water. Multiple groups of stirring paddles with different rotation speeds are arranged in the stirring reaction tank to fully mix and react the flocculants with the waste water. The inclined tube sedimentation tank utilizes the principle of shallow sedimentation to accelerate the sedimentation speed of the flocs;

[0038] The ion exchange and adsorption deep treatment unit includes an ion exchange resin column and an activated carbon adsorption tower. The ion exchange resin column is used to remove heavy metal ions and some soluble salts in the waste water, and the activated carbon adsorption tower is used to adsorb organic matters, pigments, and odor substances in the waste water;

[0039] The recycling and discharge monitoring unit is provided with a clean water tank, a recycled water pump, and a water quality monitoring sensor. The clean water tank is used to store the treated water, the recycled water pump is used to transport the clean water to the production process for recycling, and the water quality monitoring sensor is used to monitor the water quality in the clean water tank in real time. When the water quality does not meet the standard, an emergency treatment program is automatically started.

[0040] Furthermore, the vibration screening module includes multiple layers of screens with decreasing pore sizes and a high-frequency vibration motor. The pore sizes of the multiple layers of screens in the vibration screening module gradually decrease from top to bottom, and the pore size of the screen can be selected according to requirements.

[0041] Furthermore, the flocculant automatic dosing device is communicatively connected to a waste water flow rate monitoring device and a water quality detection device, and accurately doses flocculants according to the monitoring and detection data.

[0042] Furthermore, multiple groups of stirring paddles in the stirring reaction tank are arranged at different heights and angles to achieve stirring at different levels and directions.

[0043] Furthermore, the stirring paddle of the stirring reaction tank adopts main stirring and auxiliary stirring. The main stirring shaft is equipped with Archimedes spiral blades, and the auxiliary stirring shaft is provided with radial shearing blades to achieve the rapid dispersion of the flocculant and the directional growth of the flocs. The rotation speed is divided into two stages: rapid mixing and slow flocculation.

[0044] Furthermore, the ion exchange and adsorption treatment unit adopts a gradient adsorption bed structure. The ion exchange resin column and the activated carbon adsorption tower are filled with multiple layers of adsorption materials with different particle sizes inside, forming a gradient filtration layer from thick to fine to improve the pollutant interception efficiency. The upper layer is filled with large-particle-size adsorption materials that can quickly intercept suspended particles and colloidal substances in the wastewater. The ion exchange resin in the middle layer can effectively remove heavy metal ions and soluble salts, and the nanoscale adsorption materials in the lower layer deeply adsorb organic substances, pigments, and odor substances with their huge specific surface area.

[0045] A method for purifying wastewater from a concrete factory area includes the following steps:

[0046] (1) Wastewater collection and preliminary adjustment: Collect the wastewater in the concrete factory area through pipelines into the adjustment tank, and adjust the pH value, temperature, and flow rate of the wastewater in the adjustment tank to meet the set operating conditions of the subsequent treatment unit.

[0047] (2) Composite filtration pretreatment: The adjusted wastewater enters the vibrating screening module and the magnetic adsorption filtration module in sequence to remove large particle impurities and magnetic pollutants.

[0048] (3) High-efficiency flocculation reaction: The pretreated wastewater enters the stirring reaction tank, and the flocculant automatic dosing device doses the flocculant according to the preset program. The stirring paddle quickly stirs to fully mix the flocculant with the wastewater, and the flocs generated by the reaction are precipitated and separated in the inclined tube sedimentator.

[0049] (4) Ion exchange and adsorption deep treatment: The supernatant after precipitation enters the ion exchange resin column to remove heavy metal ions and soluble salts, and then enters the activated carbon adsorption tower to adsorb organic substances and odor substances.

[0050] (5) Recycling and discharge monitoring: The deeply purified water enters the clean water tank, and the recycled water pump transports it to the production link for recycling. The water quality monitoring sensor monitors the water quality of the clean water tank in real time. When the water quality is abnormal, the emergency treatment process is started.

[0051] Furthermore, in the wastewater collection and preliminary adjustment step, the pH value of the wastewater is adjusted to 6 - 9 by adding acid-base regulators.

[0052] Furthermore, in the high-efficiency flocculation reaction step, the stirring paddle first stirs quickly at a rotation speed of 100 - 150 r / min for 1 - 2 min, and then stirs slowly at a rotation speed of 30 - 50 r / min for 10 - 15 min.

[0053] Further, in the ion exchange and adsorption advanced treatment step, the residence times of the supernatant liquid in the ion exchange resin column and the activated carbon adsorption tower are controlled to be 15 - 30 min and 20 - 40 min respectively.

[0054] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects:

[0055] (1) In a weakly acidic to weakly alkaline environment with a pH value of 6 - 9, the flocs are not easily disturbed by external factors and redispersed, and can maintain a good coagulated state during the precipitation process, which is beneficial to rapid precipitation separation in the inclined tube settler, reducing the problems of sludge floating and effluent turbidity.

[0056] (2) The tiny flocs formed by rapid stirring have enough time to collide, aggregate and fuse with each other under slow stirring, and gradually grow into larger and denser flocs. Slow stirring provides a relatively mild water flow environment, avoiding the fragmentation and dispersion of the formed flocs caused by high - speed stirring. At this stage, the flocs continuously increase in size through bridging, net - catching and other effects, and their sedimentation performance is also significantly improved.

[0057] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0058] The above - mentioned are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent can make some changes or modifications to the above - mentioned technical content to be equivalent change equivalent embodiments within the scope of the technical solution of the present invention. The implementation schemes in the above - mentioned embodiments can also be further combined or replaced. However, as long as it does not depart from the technical content of the present invention, any simple modification, equivalent change and modification made to the above - mentioned embodiments according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A concrete plant wastewater purification system, comprising a composite filtration pretreatment unit, a high-efficiency flocculation reaction unit, an ion exchange and adsorption treatment unit, and a recycling and emission monitoring unit connected in sequence, characterized in that: The composite filtration pretreatment unit comprises a vibration screening module and a magnetic adsorption filtration module, a wastewater flow monitoring device is arranged between the vibration screening module and the magnetic adsorption filtration module, and an ultrasonic generator is arranged in the magnetic adsorption filtration module; The high-efficiency flocculation reaction unit includes an automatic flocculant dosing device, a multi-stage stirring reaction tank and an inclined tube precipitator; The ion exchange and adsorption treatment unit comprises an ion exchange resin column and an activated carbon adsorption tower connected in series; The recycling and discharge monitoring unit includes a clean water tank, a recycled water pump and a water quality monitoring sensor.

2. The concrete plant wastewater deep purification system according to claim 1 is characterized in that: The vibration screening module comprises multiple layers of screens with decreasing apertures and a high-frequency vibration motor, and the apertures of the multiple layers of screens of the vibration screening module gradually decrease from top to bottom.

3. The concrete plant wastewater deep purification system according to claim 1 is characterized in that: The automatic flocculant dosing device is communicatively connected with the wastewater flow monitoring device and the water quality detection device.

4. The concrete plant wastewater deep purification system according to claim 1 is characterized in that: The multiple groups of stirring paddles in the stirring reaction tank are arranged at different heights and angles to achieve stirring at different levels and directions.

5. The concrete plant wastewater deep purification system according to claim 4 is characterized in that: The stirring paddle of the stirred reaction tank adopts main stirring and auxiliary stirring, the main stirring shaft is equipped with Archimedean spiral blades, the auxiliary stirring shaft is provided with radial shear blades, and the rotation speed is divided into two stages of rapid mixing and slow flocculation.

6. The concrete plant wastewater purification system according to claim 1, characterized in that: The ion exchange and adsorption treatment unit adopts a gradient adsorption bed structure. Multiple layers of adsorption materials with different particle sizes are filled inside the ion exchange resin column and the activated carbon adsorption tower to form a gradient filtration layer from coarse to fine, thereby improving the pollutant interception efficiency.

7. A method for purifying a concrete plant area based on the system according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Wastewater collection and preliminary conditioning: The wastewater in the concrete plant is collected through pipes to the regulating tank, where the pH value, temperature and flow rate of the wastewater are adjusted to meet the set operating conditions of the subsequent treatment units; (2) Composite filtration pretreatment: The conditioned wastewater enters the vibration screening module and the magnetic adsorption filtration module in sequence to remove large particle impurities and magnetic pollutants; (3) High-efficiency flocculation reaction: The pretreated wastewater enters the stirred reaction tank, and the flocculant automatic dosing device adds flocculant according to the preset program. The stirring paddle quickly stirs the flocculant and wastewater to mix them thoroughly, and the flocculants generated by the reaction are precipitated and separated in the inclined tube sedimentator; (4) Ion exchange and adsorption deep treatment: The supernatant after precipitation enters the ion exchange resin column to remove heavy metal ions and soluble salts, and then enters the activated carbon adsorption tower to adsorb organic matter and odor substances; (5) Recycling and emission monitoring: The deeply purified water enters the clean water tank, and the reuse water pump transports it to the production link for recycling. The water quality monitoring sensor monitors the water quality of the clean water tank in real time. When the water quality is abnormal, the emergency treatment process is initiated.

8. The method for purifying wastewater from a concrete plant according to claim 7, characterized in that: In the wastewater collection and preliminary adjustment step, the pH value of the wastewater is adjusted to 6-9 by adding an acid-base regulator.

9. The method for purifying wastewater from a concrete plant according to claim 7, characterized in that: In the high-efficiency flocculation reaction step, the stirring paddle first stirs rapidly at a speed of 100 to 150 r / min for 1 to 2 minutes, and then stirs slowly at a speed of 30 to 50 r / min for 10 to 15 minutes.

10. The method for purifying wastewater from a concrete plant according to claim 7, characterized in that: In the ion exchange and adsorption deep treatment step, the residence time of the supernatant in the ion exchange resin column and the activated carbon adsorption tower is controlled to be 15 to 30 minutes and 20 to 40 minutes respectively.

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