TWM625886U - Heavy metal wastewater treatment system - Google Patents

Abstract

The present invention discloses a heavy metal wastewater treatment system, including a front-end electro-adsorption device, a back-end electro-adsorption device, and a water quality heavy metal concentration analyzer. The front-end electro-adsorption device and the back-end electro-adsorption device each have an input end and a treated water discharge end. The heavy metal concentration analyzer is configured to analyze the heavy metal concentration in the water body within the transmission line. In the overall treatment process, the heavy metals in the water to be treated can be concentrated by introducing an electro-adsorption device before entering the dosing treatment device without adding a large amount of chemicals such as heavy metal removal agents or acid-base agents. Therefore, the treatment efficiency of heavy metal wastewater can be improved, and the goal of water purification can be quickly achieved.

Description

Heavy metal wastewater treatment system

This creation relates to a wastewater treatment system, in particular to a heavy metal wastewater treatment system with high efficiency, convenient operation, and excellent environmental and economic benefits.

The wastewater produced by many industries, including electroplating industry, electronics industry and battery industry, contains a large amount of heavy metals (such as cadmium, nickel, mercury, zinc, etc.), and direct discharge will cause deterioration of the ecological environment and threaten the health of humans, animals and plants. There are many kinds of heavy metals, which can exist in water in different forms, and many heavy metals cannot be separated and exist stably in water, so the treatment is difficult.

At present, the commonly used heavy metal wastewater treatment methods include chemical treatment method and adsorption method. The chemical treatment method is to add a heavy metal removal chemical to react with metal ions in the water to form solid substances, and then remove the solid substances from the water through coagulation, gelation, solid-liquid separation and other steps, and discharge the treated water after reaching the standard. However, when the concentration of heavy metals in water is lower than a certain level, the demand for chemicals will increase in multiples, and the amount of sludge produced will also increase, which will have an adverse impact on the environment.

The adsorption method is to separate heavy metal ions in wastewater with solid-phase adsorption materials (such as resins), and discharge the treated water after reaching the standard; in addition, the regenerated liquid of the solid-phase adsorption materials also needs to be treated separately until it meets the relevant regulations before it can be discharged. However, the regeneration liquid of the solid-phase adsorption material is generally a strong acid. Therefore, a large amount of liquid alkali is often added during the back-end addition of heavy metal removal agents, coagulation or gelation treatment, so as to control the pH value to be neutral and alkaline to facilitate the The formation of solid matter also increases the conductivity of wastewater, which is not conducive to water purification.

The technical problem to be solved in this creation is to provide a heavy metal wastewater treatment system in view of the shortcomings of the existing technology. By introducing the wastewater to be treated into the front-end electro-adsorption device, the heavy metals in the wastewater can be quickly removed. If the heavy metal concentration in the water body meets the requirements, it will directly Discharge, otherwise it will be introduced into the back-end electro-adsorption device or dosing treatment device for purification again.

In order to solve the above technical problems, one of the technical solutions adopted in this creation is to provide a heavy metal wastewater treatment system, which includes a front-end electro-adsorption device, a back-end electro-adsorption device, and a first water quality heavy metal concentration analyzer. A first input end of the back-end electro-adsorption device is communicated with a treated water discharge end of the front-end electro-adsorption device through a conveying line, and the first water quality heavy metal concentration analyzer is configured to analyze the inside of the conveying line. analysis of heavy metal concentrations in water bodies.

In an embodiment of the present invention, the first water quality heavy metal concentration analyzer is connected to the conveying pipeline.

In an embodiment of the present invention, the heavy metal wastewater treatment system further includes a chemical dosing treatment device and a filtering device, a first input end of the chemical dosing treatment device and a concentrated water of the front-end electro-adsorption device The discharge end is communicated, an input end of the filter device is communicated with a discharge end of the dosing treatment device, and a second input end of the back-end electro-adsorption device is communicated with a first discharge end of the filter device Connected.

In an embodiment of the present invention, the heavy metal wastewater treatment system further includes a sludge thickening device, and an input end of the sludge thickening device is communicated with a second discharge end of the filtering device.

In an embodiment of the present invention, the heavy metal wastewater treatment system further includes a dehydration device, and an input end of the dehydration device is communicated with a discharge end of the sludge thickening device.

In an embodiment of the present invention, an input end of the front-end electro-adsorption device is communicated with another conveying pipeline. The heavy metal wastewater treatment system further includes a second water quality heavy metal concentration analyzer, and the second water quality heavy metal concentration analyzer is configured to analyze the concentration of heavy metals in the water body in the other conveying pipeline.

In an embodiment of the present invention, the second water quality heavy metal concentration analyzer is connected to the other transmission pipeline.

In an embodiment of the present invention, each of the front-end electro-suction device and the rear-end electro-suction device is a capacitive electro-suction device.

In an embodiment of the present invention, the delivery line has a branch point, and the branch point communicates with a discharge line. A treated water discharge end of the back-end electro-adsorption device is communicated with another discharge pipeline.

In an embodiment of the present invention, a concentrated water discharge end of the back-end electro-adsorption device is communicated with a second input end of the chemical dosing treatment device through a return line.

One of the beneficial effects of the present invention is that the heavy metal wastewater treatment system of the present invention can discharge the treated water through "a first input end of the back-end electro-adsorption device through a conveying pipeline and a treated water of the front-end electro-adsorption device. The first water quality heavy metal concentration analyzer is configured to analyze the concentration of heavy metals in the water body in the conveying pipeline, so as to improve the treatment efficiency of heavy metal wastewater, and in the overall treatment process, it can be Introduce the electro-adsorption device to concentrate the heavy metals in the water to be treated first, and then enter the dosing treatment device without adding a large amount of drugs (such as heavy metal removal drugs or acid-base drugs), which is beneficial to water purification and environmental protection. In addition, the heavy metal wastewater treatment system of the present invention is convenient in operation, and reduces the amount of sludge produced and the cost of sludge disposal.

In order to further understand the features and technical content of this creation, please refer to the following detailed descriptions and drawings about this creation, however, the provided drawings are only for reference and description, and are not intended to limit this creation.

The following are specific specific examples to illustrate the implementation of the "heavy metal wastewater treatment system" disclosed in this creation, and those skilled in the art can understand the advantages and effects of this creation from the content disclosed in this specification. This creation can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this creation. In addition, the drawings in this creation are only for simple schematic illustration, and are not drawn according to the actual size, and are stated in advance. The following embodiments will further describe the related technical contents of the present creation in detail, but the disclosed contents are not intended to limit the protection scope of the present creation. In addition, the term "or", as used herein, should include any one or a combination of more of the associated listed items, as the case may be.

Although terms such as "first", "second", "third", etc. are used herein to describe the conveying lines for wastewater or sludge, these terms are mainly used to distinguish one conveying line from another, or to distinguish One discharge line and another discharge line are not used to limit these transfer lines.

[First Embodiment]

Please refer to FIG. 1 , which shows a heavy metal wastewater treatment system Z1 according to the first embodiment of the present invention. As shown in FIG. 1 , the heavy metal wastewater treatment system Z1 mainly includes a front-end electro-adsorption device 1 , a back-end electro-adsorption device 2 and a first water quality heavy metal concentration analyzer 3 . The back-end electro-adsorption device 2 communicates with the front-end electro-adsorption device 1 , and the first water quality heavy metal concentration analyzer 3 is configured to analyze the concentration of heavy metals on the wastewater treated by the front-end electro-adsorption device 1 . When in use, the wastewater to be treated is first introduced into the front-end electro-adsorption device 1 to quickly remove heavy metals in the water body. If the concentration of heavy metals in the water body meets the requirements, it will be directly recycled or discharged, otherwise, it will be introduced into the back-end electro-adsorption device 2 for adsorption and removal of heavy metals again. .

In this embodiment, the front-end electro-adsorption device 1 is a capacitive electro-adsorption device, wherein the front-end electro-adsorption device 1 has an input end 11 , a treated water discharge end 12 and a concentrated water discharge end 13 . The input end 11 is configured to introduce the heavy metal wastewater to be treated into the device for the first ion electrosorption, that is, applying an electric field (applied voltage) to drive the anions and cations in the water body to move toward the oppositely charged electrodes, respectively, and use electricity. The bilayer form is adsorbed on the surface of the electrode (such as carbon electrode) to remove most of the heavy metal ions such as Mn ²⁺ , Pb ²⁺ , Cr ³⁺ , Ni ²⁺ and Cd ²⁺ in the water body. The treated water discharge end 12 is configured to discharge the wastewater subjected to the first ion electrosorption to the outside of the device for subsequent treatment, recovery or discharge. It is worth noting that when the electrode adsorption is saturated, as long as the electric field is removed (stop the supply voltage), the ions adsorbed on the electrode can be returned to the water body, and the formed concentrated water can be discharged from the concentrated water discharge end 13. for subsequent treatment, recycling or discharge.

The structure and operation of the back-end electro-adsorption device 2 are the same as those of the front-end electro-adsorption device 1 , wherein the back-end electro-adsorption device 2 has a first input end 21 , a treated water discharge end 22 and a concentrated water discharge end 23 . The first input end 21 is configured to introduce the wastewater that has undergone the first ion electrosorption (the wastewater treated by the front-end electrosorption device 1 ) into the device for the second ion electrosorption, that is, to apply an electric field (applied voltage) to drive the water into the water body. The anions and cations move toward the oppositely charged electrodes respectively, and adsorb on the surface of the electrodes (such as carbon electrodes) in the form of electric double layers to remove residual heavy metal ions such as Mn ²⁺ , Pb ²⁺ , Cr ³⁺ , Ni ²⁺ and Cd ²⁺ . In addition, the treated water discharge end 22 is configured to discharge the wastewater that has undergone the second ion electrosorption out of the device for recovery or discharge. The concentrated water discharge end 23 is configured to discharge the concentrated water formed after the electrode desorption (the ions adsorbed on the electrode return to the water body to increase the solute) out of the device for subsequent treatment, recovery or discharge.

In practical application, the front-end electro-adsorption device 1 and the rear-end electro-adsorption device 2 may be provided with only one electrode module, or may be provided with a plurality of electrode modules in series, wherein electrodes with different electrical properties are separated by a certain distance.

Furthermore, the first input end 21 of the back-end electro-adsorption device 2 can be communicated with the treated water discharge end 12 of the front-end electro-adsorption device 1 through the first conveying pipeline A1, and the first water quality heavy metal concentration analyzer 3 is configured to Carry out water quality heavy metal concentration analysis on the water body in the first conveying pipeline A1 to know the heavy metal concentration of the currently treated water. In addition, the first conveying line A1 may have a branch point P, and the branch point P is communicated with the first discharge line B1, the treated water discharge end 22 of the back-end electro-adsorption device 2 may be communicated with the second discharge line B2, and the second discharge line B2 The discharge line B2 and the first discharge line B1 may be further connected to the same line. In addition, the input end 11 of the front-end electro-adsorption device 1 can introduce the heavy metal wastewater to be treated through the second conveying pipeline A2; The second transfer line A2 is introduced.

In practical application, the first water quality heavy metal concentration analyzer 3 can be connected to the first conveying pipeline A1, and can automatically collect water samples in the first conveying pipeline A1 for analysis, for example, from the target pipeline area (such as an automatic collector) A water sample is collected in the upstream area of the first delivery line A1). However, the above-mentioned example is only one possible embodiment and is not intended to limit the present invention. In some embodiments, the water sample can also be collected manually from the target pipeline area, and then transferred to the first water quality heavy metal concentration analyzer 3 for analysis.

Please refer to FIG. 1 again, the heavy metal wastewater treatment system Z1 may further include a second water quality heavy metal concentration analyzer 4, and the second water quality heavy metal concentration analyzer 4 is configured to perform water quality heavy metal concentration analysis on the water body in the second conveying pipeline A2 , the operation mode is the same as that of the first water quality heavy metal concentration analyzer 3, in order to know the heavy metal concentration of the inflow water (heavy metal waste water to be treated), so that the heavy metal concentration in the treated water can reach a certain proportion of the inflow water heavy metal concentration (such as 90% or more). % or more), start the ion desorption and flushing and discharge concentrated water procedures of the front-end electro-adsorption device 1 to ensure a stable wastewater treatment effect.

[Second Embodiment]

Please refer to FIG. 2 , which shows a heavy metal wastewater treatment system Z2 according to the second embodiment of the present invention. As shown in FIG. 2 , except for the front-end electro-adsorption device 1 , the back-end electro-adsorption device 2 , the first water quality heavy metal concentration analyzer 3 and the second water quality heavy metal concentration analyzer 4 described in the first embodiment, heavy metals The wastewater treatment system Z2 also includes a dosing treatment device 5 and a filtering device 6, which are arranged between the front-end electro-adsorption device 1 and the back-end electro-adsorption device 2, so as to separate the front-end electro-adsorption device 1 and the back-end electro-adsorption device 2. The discharged concentrated water is purified, thereby improving the overall water recovery rate of the system and achieving no concentrated water discharge.

In this embodiment, the dosing treatment device 5 may include a reaction tank having a first input end 51 , a dosing end 52 and a discharge end 53 . The first input end 51 is configured to introduce the concentrated water discharged from the front-end electro-adsorption device 1 into the device for dosing treatment, so that the heavy metal pollutants in the wastewater react with the additional heavy metal removal agent to form solid substances (such as heavy metal-containing solids). particles). The dosing end 52 is configured to add a quantitative heavy metal removal agent to the concentrated water. Drain 53 is configured to drain the medicated water out of the device.

In addition, the filtering device 6 may include a membrane filter having an input end 61 , a first discharge end 62 and a second discharge end 63 . The input end 61 is configured to introduce the medicated treated water into the device for filtration. The filtration membrane used can be a microfiltration membrane or an ultrafiltration membrane to remove suspended solids and muddy substances in the water body. The first discharge end 62 is configured to discharge the filtered water out of the device, and the second discharge end 63 is configured to discharge the suspended solids and muddy substances filtered from the water body out of the device.

In practical application, the first input end 51 of the dosing treatment device 5 can be communicated with the concentrated water discharge end 13 of the front-end electro-adsorption device 1 through the third conveying pipeline A3, and the input end 61 of the filtering device 6 can pass through the fourth conveying pipeline A4. It communicates with the discharge end 53 of the dosing treatment device 5 . In addition, the back-end electro-adsorption device 2 may further have a second input end 24, which may communicate with the first discharge end 62 of the filter device 6 through the fifth delivery line A5. In order to improve the circulation and practicability of the heavy metal wastewater treatment system Z1, the dosing treatment device 5 can also have a second input end 54, which can be communicated with the concentrated water discharge end 23 of the back-end electro-adsorption device 2 through a return line C1 .

The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not repeated here in order to reduce repetition. Similarly, the related technical details mentioned in this embodiment can also be applied in the first embodiment.

[Third Embodiment]

Please refer to FIG. 3 , which shows a heavy metal wastewater treatment system Z3 according to the third embodiment of the present invention. As shown in FIG. 3, in addition to the front-end electrosorption device 1, the back-end electrosorption device 2, the first water quality heavy metal concentration analyzer 3, the second water quality heavy metal concentration analyzer 4, In addition to the dosing treatment device 5 and the filtering device 6 , the heavy metal wastewater treatment system Z3 also includes a sludge thickening device 7 and a dewatering device 8 . The sludge thickening device 7 communicates with the filtering device 6 , and the dewatering device 8 communicates with the sludge thickening device 7 .

In this embodiment, the sludge thickening device 7 can be a gravity thickening device, an air flotation thickening device or a centrifugal thickening device, which has an input end 71 and a discharge end 72 . The input end 71 is configured to introduce the sludge filtered from the medicated treatment water into the device for concentration, so as to increase the sludge concentration and reduce the volume of the sludge, and the discharge end 72 is configured to discharge the concentrated sludge out of the device . In addition, the dehydration device 8 can be a mechanical dehydration device, which has an input end 81 for introducing the concentrated sludge into the device for dehydration, and the obtained metal solid waste can be transferred to a designated place for final treatment and dehydration. Disposal (eg stabilization, solidification, landfill or incineration).

In practical application, the input end 71 of the sludge thickening device 7 can be communicated with the second discharge end 63 of the filtering device 6 through the sixth conveying line A6, and the input end 81 of the dewatering device 8 can be communicated with the sludge through the seventh conveying line A7. The discharge end 72 of the enrichment device 7 is in communication.

The related technical details mentioned in the first and second embodiments are still valid in this embodiment, and are not repeated here in order to reduce repetition. Likewise, the related technical details mentioned in this embodiment can also be applied to the first and second embodiments.

[Advantageous effects of the embodiment]

One of the beneficial effects of the present invention is that the heavy metal wastewater treatment system of the present invention can discharge the treated water through "a first input end of the back-end electro-adsorption device through a conveying pipeline and a treated water of the front-end electro-adsorption device. The first water quality heavy metal concentration analyzer is configured to analyze the concentration of heavy metals in the water body in the conveying pipeline, so as to improve the treatment efficiency of heavy metal wastewater, and in the overall treatment process, it can be Introduce the electro-adsorption device to concentrate the heavy metals in the water to be treated first, and then enter the dosing treatment device without adding a large amount of drugs (such as heavy metal removal drugs or acid-base drugs), which is beneficial to water purification and environmental protection. In addition, the heavy metal wastewater treatment system of the present invention is convenient in operation, and reduces the amount of sludge produced and the cost of sludge disposal.

Furthermore, a dosing treatment device and a filtering device can be further arranged between the front-end electro-adsorption device and the back-end electro-adsorption device to purify the concentrated water discharged from the front-end electro-adsorption device and the rear-end electro-adsorption device, thereby improving The overall water recovery rate of the system, and achieve no concentrated water discharge. In addition, the circulation and practicability of the heavy metal wastewater treatment system can be improved in the presence of the dosing treatment device and the filtering device.

Furthermore, since the heavy metal ions in the concentrated water discharged from the front-end electro-adsorption device and the back-end electro-adsorption device are further concentrated, the dosing treatment device can achieve a certain degree of heavy metal ion removal effect with less dosing; The concentration of heavy metals in the water body has not yet met the requirements, and heavy metals can still be removed by adsorption through the back-end electro-adsorption device.

Furthermore, this creation abandons the method of adding coagulants and gelling agents to make the particulate matter aggregate and remove it more easily. Instead, a filter device is used to directly filter out the particulate matter in the water body, which can save both coagulant and glue. The cost of the coagulant and the blocking of the back-end electro-adsorption device and pipeline caused by the coagulant can be avoided, and the amount of sludge to be disposed of can be reduced.

The contents disclosed above are only the preferred and feasible embodiments of this creation, and are not intended to limit the scope of the patent application of this creation. Therefore, any equivalent technical changes made by using the descriptions and drawings of this creation are included in the application for this creation. within the scope of the patent.

Z1, Z2, Z3: heavy metal wastewater treatment system 1: Front-end electro-adsorption device 11: Input terminal 12: Treated water discharge end 13: Concentrated water discharge end 2: Back-end electro-adsorption device 21: The first input terminal 22: Treated water discharge end 23: Concentrated water discharge end 24: The second input terminal 3: The first water quality heavy metal concentration analyzer 4: The second water quality heavy metal concentration analyzer 5: Dosing treatment device 51: The first input terminal 52: Dosing end 53: Discharge end 54: The second input terminal 6: Filter device 61: Input terminal 62: First discharge end 63: Second discharge end 7: Sludge thickening device 71: Input terminal 72: Discharge end 8: Dehydration device 81: Input terminal A1: The first delivery line P: divergence point A2: Second delivery line A3: The third delivery line A4: Fourth delivery line A5: Fifth delivery line A6: Sixth Delivery Line A7: Seventh delivery line B1: First discharge line B2: Second discharge line C1: return line

FIG. 1 is a schematic diagram of a heavy metal wastewater treatment system according to a first embodiment of the invention.

FIG. 2 is a schematic diagram of a heavy metal wastewater treatment system according to a second embodiment of the invention.

FIG. 3 is a schematic diagram of a heavy metal wastewater treatment system according to a third embodiment of the invention.

Z1: Heavy Metal Wastewater Treatment System

1: Front-end electro-adsorption device

11: Input terminal

12: Treated water discharge end

13: Concentrated water discharge end

2: Back-end electro-adsorption device

21: The first input terminal

22: Treated water discharge end

23: Concentrated water discharge end

3: The first water quality heavy metal concentration analyzer

4: The second water quality heavy metal concentration analyzer

A1: The first delivery line

P: divergence point

A2: Second delivery line

B1: First discharge line

B2: Second discharge line

Claims (10)

A heavy metal wastewater treatment system, comprising: a front-end electro-adsorption device; a back-end electro-adsorption device, a first input end of the back-end electro-adsorption device is discharged through a conveying pipeline and a treated water of the front-end electro-adsorption device and a first water quality heavy metal concentration analyzer, the first water quality heavy metal concentration analyzer is configured to analyze the concentration of heavy metals in the water body in the conveying pipeline. The heavy metal wastewater treatment system according to claim 1, wherein the first water quality heavy metal concentration analyzer is connected to the conveying pipeline. The heavy metal wastewater treatment system according to claim 1, wherein the heavy metal wastewater treatment system further comprises a chemical dosing treatment device and a filter device, a first input end of the chemical dosing treatment device and the front-end electrosorption A concentrated water discharge end of the device is communicated with, an input end of the filter device is communicated with a discharge end of the dosing treatment device, and a second input end of the back-end electro-adsorption device is communicated with the filter device. A first discharge end communicates. The heavy metal wastewater treatment system according to claim 3, wherein the heavy metal wastewater treatment system further comprises a sludge thickening device, an input end of the sludge thickening device is communicated with a second discharge end of the filtering device . The heavy metal wastewater treatment system according to claim 4, wherein the heavy metal wastewater treatment system further comprises a dehydration device, and an input end of the dehydration device is communicated with a discharge end of the sludge thickening device. The heavy metal wastewater treatment system according to claim 1, wherein an input end of the front-end electro-adsorption device is communicated with another conveying pipeline; wherein, the heavy metal wastewater treatment system further comprises a second water quality heavy metal concentration analyzer, And the second water quality heavy metal concentration analyzer is configured to analyze the heavy metal concentration in the water body in the other transmission pipeline. The heavy metal wastewater treatment system according to claim 6, wherein the second water quality heavy metal concentration analyzer is connected to the other conveying pipeline. The heavy metal wastewater treatment system according to any one of claims 1 to 7, wherein each of the front-end electro-adsorption device and the back-end electro-adsorption device is a capacitive electro-adsorption device. The heavy metal wastewater treatment system according to any one of claims 1 to 7, wherein the conveying pipeline has a branch point, and the branch point is communicated with a discharge pipeline; wherein, the back-end electro-adsorption device has a A treated water discharge end is communicated with another discharge line. The heavy metal wastewater treatment system according to any one of claims 3 to 5, wherein a concentrated water discharge end of the back-end electro-adsorption device is connected to a second input end of the chemical dosing treatment device through a return line Connected.

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