Recovery device for low-voltage electric field flotation of leacheate of heavy metal contaminated soil

Abstract

The utility model discloses a recycling device for low-voltage electric field flotation of leacheate of heavy metal contaminated soil, and relates to the technical field of heavy metal pollution. Comprising a leaching agent storage tank, a leaching solution storage tank, a leaching solution screw pump, a leaching reactor, a low-voltage pulsed electric field generator, a heavy metal flotation ultrasonic-assisted separator, an ion exchange filter, a reverse osmosis filter and a metal sludge collector, the leaching reactor, the low-voltage pulse electric field generator and the heavy metal flotation ultrasonic-assisted separator are arranged in sequence; according to the utility model, a leaching agent storage tank, a leaching solution storage tank, a leaching solution screw pump, a leaching reactor, a low-voltage pulse electric field generator, a heavy metal flotation ultrasonic-assisted separator, an ion exchange filter, a reverse osmosis filter, a metal sludge collector and a slurry outlet of the leaching reactor are arranged; heavy metal ions can be effectively extracted from the soil, and high removal rate and high recovery rate of heavy metal in the soil are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heavy metal contaminated soil remediation, and specifically relates to a low-voltage electric field flotation and recycling device for leaching solution of heavy metal contaminated soil. Background Technique

[0002] The technical field of soil remediation is experiencing rapid development, and numerous remediation techniques have emerged to address the increasingly severe soil pollution problem. Traditional soil remediation methods include physical methods, chemical methods, and biological methods, etc. Phytoremediation technology uses plants and their rhizosphere microorganisms to absorb, accumulate, degrade, or stabilize heavy metals in the soil. Microbial remediation technology relies on the metabolic action of microorganisms to degrade, transform, or stabilize heavy metals in the soil. Specific microorganisms can change the chemical forms of heavy metals through processes such as adsorption, precipitation, oxidation-reduction, etc., thereby reducing their toxicity and bioavailability. Soil washing technology is a method of flushing the soil with water or chemical solutions to dissolve and separate heavy metals from the soil. This technology is applicable to sites with relatively light heavy metal pollution and good soil permeability. The leaching solution can be clean water, acidic solution, alkaline solution, or surfactant solution, etc. The washed soil needs to be properly treated to prevent secondary pollution. Electrokinetic remediation technology is a method of separating heavy metals from the soil by using the action of an electric field through processes such as electromigration, electroosmosis, and electrophoresis. This technology is applicable to low-permeability soils and fine-grained soils. Under the action of an electric field, heavy metal ions will move towards the electrodes and then be recovered or treated through a collection system.

[0003] However, these single methods often have problems such as low treatment efficiency, high cost, and secondary pollution. Therefore, it is particularly important to develop an efficient, environmentally friendly, and economical soil remediation technology and equipment.

[0004] Therefore, in view of this, research and improvement are carried out on the existing structural deficiencies, and a low-voltage electric field flotation and recycling device for leaching solution of heavy metal contaminated soil is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a low-voltage electric field flotation and recycling device for leaching solution of heavy metal contaminated soil to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present utility model provides the following technical solution: A low-pressure electric field flotation recovery device for leaching solution of heavy metal contaminated soil, comprising a leaching agent storage tank, a leaching solution storage tank, a leaching solution screw pump, a leaching reactor, a low-voltage pulse electric field generator, a heavy metal flotation ultrasonic assisted separator, an ion exchange filter, a reverse osmosis filter and a metal sludge collector. The leaching reactor, the low-voltage pulse electric field generator and the heavy metal flotation ultrasonic assisted separator are arranged in sequence. The right side of the mixed liquid discharge port of the leaching reactor is connected to the low-voltage pulse electric field generator, and the left side of the low-voltage pulse electric field generator is provided with an electric field generator mixed liquid inlet. The top of the low-voltage pulse electric field generator is provided with a heavy metal flotation ultrasonic assisted separator. The bottom of the ion exchange filter is provided with an ion exchange filter water outlet. The bottom of the ion exchange filter water outlet is connected to the reverse osmosis filter. The bottom of the reverse osmosis filter is provided with a metal sludge collector.

[0007] Further, the bottoms of the leaching agent storage tank and the leaching solution storage tank are connected to both sides of the leaching solution screw pump. The bottom of the leaching solution screw pump is connected to the left side of the leaching reactor through leaching agent from the leaching reactor inlet.

[0008] Further, the bottom of the leaching reactor is provided with a leaching reactor mud outlet, and a valve is arranged at the bottom of the leaching reactor mud outlet.

[0009] Further, the top of the right side of the leaching reactor is provided with a leaching reactor mixed liquid discharge port, and one side of the leaching reactor mixed liquid discharge port is communicated with one side of the electric field generator mixed liquid inlet.

[0010] Further, the pulse frequency of the low-voltage pulse electric field generator is 50Hz to 150Hz, the pulse width is 5ms to 25ms, and the electrode spacing is 10 to 20cm. The frequency of the heavy metal flotation ultrasonic assisted separator is 20 - 75kHz, the power range is 0 - 800W, and the ultrasonic intensity is 0.1 - 1W / cm 2 。

[0011] Further, the right side of the heavy metal flotation ultrasonic assisted separator is provided with a heavy metal flotation ultrasonic assisted separator water outlet. The right side of the heavy metal flotation ultrasonic assisted separator water outlet is connected to the ion exchange filter. The ion exchange filter is communicated with the right side of the ion exchange filter water outlet. The right side of the reverse osmosis filter is provided with a reverse osmosis filter water inlet.

[0012] Further, the bottom of the right side of the low-voltage pulse electric field generator is provided with a metal sludge discharge port, and a valve is arranged at the right side of the metal sludge discharge port.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. Compared with the prior art, through the relationship among the eluent storage tank, the leaching solution storage tank, the leaching solution screw pump, the leaching reactor, the low-voltage pulse electric field generator, the heavy metal flotation ultrasonic-assisted separator, the ion exchange filter, the reverse osmosis filter, the metal sludge collector and the slurry outlet of the leaching reactor, the recovery device for low-voltage electric field flotation of leaching solution for heavy metal-contaminated soil can effectively extract heavy metal ions from the soil, achieving a high removal rate and high recovery rate of heavy metals in the soil. By mixing a specific eluent with the contaminated soil, the heavy metal ions are desorbed from the soil particles to form a mixed solution containing heavy metal ions. The leached mixed solution is introduced into the flotation tank. Under the action of the low-voltage electric field, the heavy metal ions and some suspended substances are charged and aggregated on the electrode plate to form heavy metal sludge;

[0015] 2. Compared with the prior art, through the relationship among the eluent storage tank, the leaching solution storage tank, the leaching solution screw pump, the leaching reactor, the low-voltage pulse electric field generator, the heavy metal flotation ultrasonic-assisted separator, the ion exchange filter, the reverse osmosis filter, the metal sludge collector and the slurry outlet of the leaching reactor, the recovery device for low-voltage electric field flotation of leaching solution for heavy metal-contaminated soil can recover heavy metals, achieving nearly zero emissions of heavy metal pollutants in the leaching solution and reducing environmental pollution. The heavy metal sludge after flotation is collected by the collector and further processed by the filtering device to extract heavy metals. The filtrate can be recycled or safely discharged after treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0017] In the figure: 1, eluent storage tank; 2, leaching solution storage tank; 3, leaching solution screw pump; 4, eluent from the inlet of the leaching reactor; 5, leaching reactor; 6, outlet of the mixed solution of the leaching reactor; 7, inlet of the mixed solution of the electric field generator; 8, low-voltage pulse electric field generator; 9, heavy metal flotation ultrasonic-assisted separator; 10, outlet of the heavy metal flotation ultrasonic-assisted separator; 11, ion exchange filter; 12, outlet of the ion exchange filter; 13, inlet of the reverse osmosis filter; 14, reverse osmosis filter; 15, metal sludge collector; 16, metal sludge discharge port; 17, slurry outlet of the leaching reactor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1: As Figure 1 shown, a recovery device for low-pressure electric field flotation of leaching solution for heavy metal-contaminated soil includes a leaching agent storage tank 1, a leaching solution storage tank 2, a leaching solution screw pump 3, a leaching reactor 5, a low-voltage pulse electric field generator 8, a heavy metal flotation ultrasonic-assisted separator 9, an ion exchange filter 11, a reverse osmosis filter 14, and a metal sludge collector 15. The leaching reactor 5, the low-voltage pulse electric field generator 8, and the heavy metal flotation ultrasonic-assisted separator 9 are arranged in sequence. The right side of the mixed liquid discharge port 6 of the leaching reactor 5 is connected to the low-voltage pulse electric field generator 8, and the left side of the low-voltage pulse electric field generator 8 is provided with an electric field generator mixed liquid inlet 7. The top of the low-voltage pulse electric field generator 8 is provided with a heavy metal flotation ultrasonic-assisted separator 9. The bottom of the ion exchange filter 11 is provided with an ion exchange filter water outlet 12, and the bottom of the ion exchange filter water outlet 12 is connected to the reverse osmosis filter 14. The bottom of the reverse osmosis filter 14 is provided with a metal sludge collector 15.

[0020] Furthermore, the bottoms of the leaching agent storage tank 1 and the leaching solution storage tank 2 are connected to both sides of the leaching solution screw pump 3, and the bottom of the leaching solution screw pump 3 is connected to the left side of the leaching reactor 5 through the leaching agent from the leaching reactor inlet 4.

[0021] Furthermore, the bottom of the leaching reactor 5 is provided with a leaching reactor slurry outlet 17, and a valve is provided at the bottom of the leaching reactor slurry outlet 17.

[0022] Furthermore, the top of the right side of the leaching reactor 5 is provided with a leaching reactor mixed liquid discharge port 6, and one side of the leaching reactor mixed liquid discharge port 6 is communicated with one side of the electric field generator mixed liquid inlet 7.

[0023] Furthermore, the pulse frequency of the low-voltage pulse electric field generator 8 is 50Hz - 150Hz, and the pulse width is 5ms - 25ms, the electrode spacing is 10 - 20cm, the frequency of the heavy metal flotation ultrasonic-assisted separator 9 is 20 - 75kHz, the power range is 0 - 800W, and the ultrasonic intensity is 0.1 - 1W / cm 2 2.

[0024] Furthermore, a heavy metal flotation ultrasonic-assisted separator water outlet 10 is provided on the right side of the heavy metal flotation ultrasonic-assisted separator 9. The right side of the heavy metal flotation ultrasonic-assisted separator water outlet 10 is connected to an ion exchange filter 11, and the ion exchange filter 11 communicates with the right side of the ion exchange filter water outlet 12. A reverse osmosis filter water inlet 13 is provided on the right side of the reverse osmosis filter 14.

[0025] Furthermore, a metal sludge discharge port 16 is provided at the bottom on the right side of the low-voltage pulsed electric field generator 8, and a valve is provided on the right side of the metal sludge discharge port 16.

[0026] Working principle: Through the relationship among the eluent storage tank 1, the eluent storage tank 2, the eluent screw pump 3, the elution reactor 5, the low-voltage pulsed electric field generator 8, the heavy metal flotation ultrasonic-assisted separator 9, the ion exchange filter 11, the reverse osmosis filter 14, the metal sludge collector 15, and the elution reactor slurry outlet 17, heavy metal ions can be effectively extracted from the soil, achieving a high removal rate and high recovery rate of heavy metals in the soil. By mixing a specific eluent with the contaminated soil, the heavy metal ions are desorbed from the soil particles to form a mixed solution containing heavy metal ions. The eluted mixed solution is introduced into the flotation cell. Under the action of the low-voltage electric field, the heavy metal ions and some suspended substances are charged and aggregated on the electrode plate to form heavy metal sludge.

[0027] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. A recovery device for low-pressure electric field flotation of leaching solution for heavy metal contaminated soil, comprising a leaching agent storage tank (1), a leaching solution storage tank (2), a leaching solution screw pump (3), a leaching reactor (5), a low-voltage pulse electric field generator (8), a heavy metal flotation ultrasonic-assisted separator (9), an ion exchange filter (11), a reverse osmosis filter (14) and a metal sludge collector (15), characterized in that, The elution reactor (5), low-voltage pulsed electric field generator (8), and heavy metal flotation ultrasonic-assisted separator (9) are arranged in sequence. The right side of the elution reactor mixed liquid discharge port (6) is connected to the low-voltage pulsed electric field generator (8), and the left side of the low-voltage pulsed electric field generator (8) is provided with an electric field generator mixed liquid inlet (7). The top of the low-voltage pulsed electric field generator (8) is provided with a heavy metal flotation ultrasonic-assisted separator (9). The bottom of the ion exchange filter (11) is provided with an ion exchange filter water outlet (12), and the bottom of the ion exchange filter water outlet (12) is connected to a reverse osmosis filter (14). The bottom of the reverse osmosis filter (14) is provided with a metal sludge collector (15).

2. The low-voltage electric field flotation recovery device for the leaching solution of heavy metal contaminated soil according to claim 1, wherein The bottoms of the eluent storage tank (1) and the elution liquid storage tank (2) are connected to both sides of the elution liquid screw pump (3). The bottom of the elution liquid screw pump (3) is connected to the left side of the elution reactor (5) through the elution agent from the elution reactor inlet (4).

3. The eluent low-voltage electric field flotation recovery device for heavy metal contaminated soil according to claim 2, characterized in that, The bottom of the elution reactor (5) is provided with an elution reactor slurry outlet (17), and a valve is provided at the bottom of the elution reactor slurry outlet (17).

4. A recovery device for low-voltage electric field flotation selection of leaching solution for heavy metal contaminated soil according to claim 1, characterized in that, The top of the right side of the elution reactor (5) is provided with an elution reactor mixed liquid discharge port (6), and one side of the elution reactor mixed liquid discharge port (6) is communicated with one side of the electric field generator mixed liquid inlet (7).

5. The eluent low-voltage electric field flotation recovery device for heavy metal contaminated soil according to claim 1, characterized in that, The pulse frequency of the low-voltage pulsed electric field generator (8) is 50 Hz to 150 Hz, the pulse width is 5 ms to 25 ms, the electrode spacing is 10 to 20 cm, the frequency of the heavy metal flotation ultrasonic-assisted separator (9) is 20 - 75 kHz, the power range is 0 - 800 W, and the ultrasonic intensity is 0.1 - 1 W / cm 2 .

6. The low-voltage electric field flotation recovery device for the leaching solution of heavy metal contaminated soil according to claim 1, characterized in that, The right side of the heavy metal flotation ultrasonic-assisted separator (9) is provided with a heavy metal flotation ultrasonic-assisted separator water outlet (10). The right side of the heavy metal flotation ultrasonic-assisted separator water outlet (10) is connected to an ion exchange filter (11). The ion exchange filter (11) is communicated with the right side of the ion exchange filter water outlet (12). The right side of the reverse osmosis filter (14) is provided with a reverse osmosis filter water inlet (13).

7. A recovery device for low-voltage electric field flotation selection of leaching solution for heavy metal contaminated soil according to claim 1, characterized in that, The bottom of the right side of the low-voltage pulsed electric field generator (8) is provided with a metal sludge discharge port (16), and a valve is provided on the right side of the metal sludge discharge port (16).

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