CN218309996U - Biological leaching device for treating heavy metal contaminated soil - Google Patents
Biological leaching device for treating heavy metal contaminated soil Download PDFInfo
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- CN218309996U CN218309996U CN202222206201.XU CN202222206201U CN218309996U CN 218309996 U CN218309996 U CN 218309996U CN 202222206201 U CN202222206201 U CN 202222206201U CN 218309996 U CN218309996 U CN 218309996U
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Abstract
The utility model relates to a biological drip washing device for handling heavy metal contaminated soil, biological drip washing device mainly include feeding conveyor, two-stage screening and biological spray set, the biological drip washing device of degree of depth, dewatering device and waste liquid circulation processing apparatus. The device carries out biological leaching on the soil polluted by the heavy metal through the processes of soil two-stage screening, biological spraying mixing treatment, deep biological leaching and mechanical dehydration to obtain purified soil, and meanwhile, the biological leaching agent is recycled.
Description
Technical Field
The utility model relates to a heavy metal contaminated soil restores the field, and more specifically relates to a biological drip washing device for handling heavy metal contaminated soil.
Background
Chromium (Cr) is an important metal element and has wide applications in metallurgy, electroplating, leather tanning and paint manufacturing. Because of the inability to properly discharge and effectively control, large amounts of chromium are discharged into the environment, causing serious pollution. Exposure to chromium compounds may be at risk of cancer because of its strong toxicity and mutagenicity.
At present, the soil remediation generally adopts a soil leaching technology to extract heavy metals in soil, various detergents such as organic acid, chelating agent, inorganic salt and the like are added into the soil, the soil remediation has the characteristics of low cost, high efficiency, simplicity in operation, thorough treatment and the like, and the soil leaching agent is a key factor influencing the heavy metal removal efficiency of soil cleaning. At present, a lot of researches on soil leaching agents exist, but most of the researches still stay in a laboratory stage, the general soil leaching agents can be directly added into soil, and the soil and the leaching agents are difficult to fully contact and react through manual simple treatment, so that the treatment efficiency is low, corresponding soil leaching equipment is lacked, the existing soil leaching equipment on the market is mostly only applied to physical leaching and chemical leaching of heavy metal polluted soil, and special equipment in the aspect of biological leaching technology is still lacked in researches.
Therefore, based on the above-mentioned defect that has the problem, need find a biological leaching device for handling heavy metal contaminated soil, can high-efficiently extract chromium or other heavy metals that soil exists in the device, improve the heavy metal clearance, purify soil to the biological leaching liquid that adopts can cyclic utilization, saves cost, green.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical defects in the prior art, the invention provides a biological leaching device for treating heavy metal contaminated soil, which is used for biologically leaching the heavy metal contaminated soil through the processes of soil two-stage screening, biological spraying and mixing treatment, deep biological leaching and mechanical dehydration in the device, efficiently extracting heavy metal in the heavy metal contaminated soil through biological leaching solution, simultaneously completing the leaching and screening work of the contaminated soil to obtain purified soil, and finally recycling the biological leaching solution; the equipment has simple structure, reasonable layout and reasonable component connection, improves the removal rate of heavy metal and saves the cost of the medicament.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
provided is a biological leaching device for treating heavy metal contaminated soil, comprising:
the feeding conveying device is used for receiving the heavy metal contaminated soil to be treated and is connected with the two-stage screening and biological leaching device;
the two-stage screening and biological spraying device comprises a primary screening device, a secondary screening device and a biological spraying device, wherein a feed inlet of the primary screening device is connected with the feeding conveying device, the biological spraying device is connected with the primary screening device and sprays biological leacheate to heavy metal contaminated soil in the primary screening device, a feed inlet of the secondary screening device is connected with a discharge port of the primary screening device, and soil slurry subjected to biological spraying and screening is discharged from a discharge port of the secondary screening device;
the deep biological leaching device comprises at least one biological leaching and stirring device and an automatic dosing device, wherein the at least one biological leaching and stirring device is used for receiving soil slurry subjected to biological leaching and screening, the automatic dosing device is used for supplementing biological leaching liquid in the at least one biological leaching and stirring device, the at least one biological leaching and stirring device is connected with a discharge port of the secondary screening device, the automatic dosing device is connected with the at least one biological leaching and stirring device, and the soil slurry subjected to deep biological leaching and screening by the at least one biological leaching and stirring device is discharged from the discharge port;
the dewatering device comprises a slurry concentration device for receiving the soil slurry deeply and biologically leached by the at least one biological leaching and stirring device and a dewaterer for carrying out solid-liquid separation on the soil slurry, wherein a feed port of the slurry concentration device is connected with a discharge port of the at least one biological leaching and stirring device, a discharge port of the slurry concentration device is connected with a feed port of the dewaterer, and the soil and waste liquid after solid-liquid separation are respectively discharged from a discharge port and a liquid discharge port of the dewaterer;
the waste liquid circulating treatment device comprises a water treatment device for receiving and treating waste liquid after solid-liquid separation of the dehydrator, a biological leacheate storage device for separating heavy metal precipitate from the biological leacheate and automatically feeding the biological leacheate for recycling the biological leacheate, wherein the water treatment device is connected with a liquid outlet of the dehydrator, the water treatment device is connected with the biological leacheate storage device, and the waste liquid treated by the water treatment device is conveyed to the biological leacheate storage device for recycling;
and the biological leacheate storage device is connected with the biological spraying device in the two-stage screening and biological spraying device, and the recovered biological leacheate is conveyed to the two-stage screening and biological spraying device to rinse the soil in the first-stage screening device.
Preferably, at least one biological leaching stirring device of the deep biological leaching device is provided with 4 biological leaching stirring devices, the 4 biological leaching stirring devices are provided with liquid level control devices and stirring devices and are communicated with each other, the automatic dosing device comprises a dosing pipe communicated with the at least one biological leaching stirring device and a tank body for storing biological leaching liquid, and the automatic dosing device supplements the biological leaching liquid in the at least one biological leaching stirring device.
Preferentially, feeding conveyor is including feeder hopper and the first conveyor that is used for receiving pending heavy metal contaminated soil, and first conveyor's feed inlet is connected to the discharge gate of feeder hopper, and soil is discharged from first conveyor's discharge gate, and one-level screening plant's feed inlet is connected with feeding conveyor's first conveyor's discharge gate.
Preferably, the primary screening device further comprises a second conveying device; the secondary screening device also comprises a third conveying device; the second conveying device is used for discharging coarse sand in soil screened by the primary screening device, and the third conveying device is used for discharging fine sand in soil screened by the secondary screening device.
Preferably, a slurry temporary storage device is arranged between the at least one biological leaching stirring device and the slurry concentration device, and a slurry temporary storage device is arranged between the secondary screening device and the at least one biological leaching stirring device.
Preferably, the discharge port of the dewatering machine is provided with a fourth conveyor for discharging the soil after solid-liquid separation.
Preferably, the dewatering machine comprises one or more of a horizontal screw centrifugal dewatering device, a stacked screw dewatering device and a belt dewatering device.
Preferably, the primary screening device and the secondary screening device are one or more of a drum-type hydraulic screening device and a vibrating hydraulic screening device.
Preferably, the water treatment device of the waste liquid circulation treatment device is a three-level inclined-bottom conical sedimentation tank, the inner space of the sedimentation tank is provided with a feeder and a stirring device, and a heavy metal precipitator is added through the feeder to carry out solid-liquid separation on the waste liquid recovered in the waste liquid circulation treatment device so as to obtain recyclable biological leacheate.
Preferably, the bioleaching solution is a mixture prepared by coupling nano materials and microorganisms; the microorganism is a bacterium.
In general, the present invention has one or more of the following technical effects:
(1) The utility model provides a process of soil two-stage screening, biological spraying and mixing treatment, deep biological leaching and mechanical dehydration, which has simple equipment structure, reasonable layout and reasonable component connection; the polluted soil can be integrally treated, and the heavy metal polluted soil is sieved and treated by biological spraying, so that the biological leaching cost is saved.
(2) And a biological spraying device is added in the two-stage screening, biological spraying is synchronously carried out in the soil screening process, the soil can be in full contact reaction with the biological leacheate recovered by the waste liquid circulating treatment device, pretreatment is realized, and the soil enters the deep biological leaching device for deep leaching, so that the removal rate of chromium and other heavy metals in the soil is improved.
(3) The soil bioleaching solution is prepared by mixing the nano material and the microorganism, is green and safe, and the leaching waste liquid generated after the bioleaching solution is leached can be recycled without a complex water treatment process.
(4) The soil screening and spraying treatment equipment has high automation degree, can save the cost of a large number of operators, can achieve the daily treatment capacity of 500 tons, and has low comprehensive cost.
(5) The waste liquid circulating treatment device is a three-level inclined bottom conical sedimentation tank, a feeder and a stirring device are attached, the feeder provides a heavy metal precipitator, the stirring device enables the leaching waste liquid to be fully contacted with the heavy metal precipitator, the rotating speed of a rotary stirring system is set to be 100-500 r/min, microorganisms partially enriched with heavy metals and inactivated microorganisms precipitate at the bottom of the waste liquid circulating treatment device after reaction is finished, and the treated biological leacheate is conveyed to a biological leacheate storage device for recycling.
(6) At least one biological leaching stirring device is also provided with an automatic dosing device, the automatic dosing device can supplement active microbial inoculum/biological leaching solution/biological strain, and the concentration of the biological leaching solution and the soil leaching efficiency can be improved under the stirring action of the stirring device.
Drawings
The foregoing and other objects, features and advantages of the invention will be more fully appreciated and understood from the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic flow diagram of the biological leaching apparatus for treating chromium-contaminated soil according to the present invention;
the biological leaching device comprises a feeding conveying device 1, a feeding hopper 101, a first conveying device 102, a second conveying device 103, a third conveying device 104, a fourth conveying device 105, a two-stage screening and biological spraying device 2, a first-stage screening device 201, a biological spraying device 202, a second-stage screening device 203, a deep biological leaching device 3, a first biological leaching stirring device 301, a second biological leaching stirring device 302, a third biological leaching stirring device 303, a fourth biological leaching stirring device 304, a biological leaching solution storage device 305, a slurry temporary storage device 306, a dewatering device 4, a slurry concentration device 401, a dewatering machine 402 and a water treatment device 403.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that in the description of the present application, a description made with reference to the expression "one embodiment", "some embodiments", "exemplary embodiments", "specific examples", or "some examples", etc., means that a specific feature, structure, material, or characteristic described in connection with the embodiment or the examples is included in at least one exemplary embodiment or example of the present disclosure. Thus, the schematic descriptions herein of what is presented above are not necessarily intended to be the same embodiment or example only. Rather, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more of the exemplary embodiments or examples. Furthermore, various exemplary embodiments or examples and features of various exemplary embodiments or examples described in this specification can be combined and combined by those skilled in the art without contradiction.
For purposes of clarity, certain techniques, structures, materials, and so forth known in the art to which this disclosure pertains have not been described in detail so as not to obscure the present application.
The present invention will be described in further detail with reference to specific embodiments.
Fig. 1 shows schematically in the form of a flow diagram a preferred embodiment of the biological leaching apparatus according to the invention for treating chromium-contaminated soil. As shown, the biological leaching apparatus mainly comprises: the device comprises a feeding conveying device 1, a two-stage screening and biological spraying device 2, a deep biological leaching device 3, a dewatering device 4 and a waste liquid circulating treatment device. The feeding conveying device 1 is used for crushing or removing stones with the particle size of about 5mm after the heavy metal polluted soil to be subjected to biological leaching treatment is crushed and screened by ALLU, the rest soil is supplied to a transport device such as a forklift and enters the feeding device 101, a discharge hole of the feeding device 101 is connected with a feeding hole of the first conveying device 102, and the soil is discharged from the discharge hole of the first conveying device 102.
Two-stage screening and biological spray system 2, including one-level screening plant 201, second grade screening plant 203 and biological spray system 202, the feed inlet of one-level screening plant 201 is connected with first conveyor 102's discharge gate, and biological spray system 202 is connected with one-level screening plant 201, and the feed inlet of second grade screening plant 203 is connected with the discharge gate of one-level screening plant 201, and the soil thick liquid after biological spray screening is discharged from the discharge gate of second grade screening plant 203. The biological spraying device 202 can be located above or on the side or in the inner space of the primary screening device 201, and performs biological spraying or rinsing on the heavy metal contaminated soil in the primary screening device. In a preferred embodiment, the biological spray device 202 may be located above the primary screening device 201 and near the feed inlet, or the biological spray may be applied to the primary screening device 201 throughout the space above the primary screening device 201. The biological spray device 202 may be a hollow cone spray head, a solid cone spray head, a square spray head, an oval spray head, a fan spray head, a cylindrical flow spray head, a two fluid spray head, a multi-fluid spray head, or other means. First-order screening plant 201 is drum-type hydraulic screening plant for the cylinder screening of heavy metal contaminated soil is in order to realize coarse sand and soil separation, and its screen cloth aperture is 0.28mm. Second grade screening plant 203 is vibrating hydraulic screening plant for the vibratory screening of heavy metal contaminated soil is in order to realize that fine sand and small-size footpath pollute soil separation, and the screen cloth aperture footpath is 0.075mm. Heavy metal contaminated soil is subjected to physical screening by the drum-type hydraulic screening device, coarse sand with the particle size larger than 0.28mm is discharged out of equipment from the drum-type hydraulic screening device, residual soil is subjected to physical screening by the vibrating-type hydraulic screening device, fine sand with the particle size larger than 0.075mm is discharged out of equipment from the vibrating-type hydraulic screening device 203, and the residual soil with the small particle size is combined with the bioleaching solution to form slurry which can be conveyed to the deep bioleaching device 3 or a slurry temporary storage device (not shown) by a lifting pump or other conveying modes. Drum-type hydraulic screening device and vibrating hydraulic screening device can exchange the use, can carry out the primary screening through vibrating hydraulic screening device earlier that is to say, and reentrant drum-type hydraulic screening device carries out the secondary screening, can also adopt other similar physical screening modes to sieve soil.
The biological spray device 202 can automatically control the on-off of spraying the biological leacheate according to the liquid scale position of the drum-type hydraulic screening device, the biological leacheate comes from the biological leacheate storage device 305, and the biological spray device 202 is used for timely supplementing regenerated biological leacheate for the drum-type hydraulic screening device and the vibrating hydraulic screening device, so that the purposes of hydraulic screening and preliminary soil washing are achieved.
The primary screening device 201 and the secondary screening device 203 further comprise a second conveying device 103 and a third conveying device 104 respectively, the second conveying device 103 is used for discharging coarse sand in soil screened by the primary screening device, and the third conveying device 104 is used for discharging fine sand in soil screened by the secondary screening device.
In one embodiment, not shown, the primary and secondary screening devices are drum screening devices, vibratory screening devices, disc screening devices, and the like.
The deep biological leaching device 3 comprises at least one biological leaching stirring device (301, 302,303, 304) for receiving the soil slurry after biological leaching screening, and an automatic dosing device (not shown) for supplementing the biological leaching solution in the at least one biological leaching stirring device, and the soil slurry after deep biological leaching by the at least one biological leaching stirring device is discharged from a discharge hole. In a preferred embodiment, at least one of the biological leaching stirring devices includes 4 biological leaching stirring devices, and the internal spaces of the first biological leaching stirring device 301, the second biological leaching stirring device 302, the third biological leaching stirring device 303, and the fourth biological leaching stirring device 304,4 all include a liquid level control device and a stirring device, the liquid level control device may be a liquid level sensor, and after entering the device, the soil slurry after biological leaching and screening may automatically switch pipelines between the 4 biological leaching stirring devices according to information provided by the liquid level sensor, so as to ensure continuous production of soil leaching. The concentration of the biological eluting agent and the soil eluting efficiency are improved under the action of the stirring device. After the soil stirring and washing is completed, the slurry flows to the slurry concentration device 401 of the slurry temporary storage device or the dehydration device 4 through a lifting pump or other conveying modes. In addition, a slurry holding device (not shown) is provided between the secondary screening device 203 and the at least one bioleaching agitation device.
In one embodiment, not shown, the first, second, third and fourth bio-leaching stirrers 301,302,303,304 further comprise automatic dosing devices (not shown) in communication with each other, the automatic dosing devices comprising dosing pipes in communication with the at least one bio-leaching stirrer and tanks for storing bio-leaching solution, the automatic dosing devices replenishing the bio-leaching solution or the bio-species or the active microbial agent in the at least one bio-leaching stirrer.
The dewatering device 4 is provided with a slurry concentration device 401 for receiving soil slurry after deep biological leaching of at least one biological leaching and stirring device and a soil slurry dewatering machine 402 for performing solid-liquid separation on the soil slurry, wherein a discharge port of the slurry concentration device 401 is connected with a feed port of the dewatering machine 402, and soil and waste liquid after solid-liquid separation are respectively discharged from a discharge port and a liquid discharge port of the dewatering machine 402. The slurry concentration device 401 is a deep-cone concentration tank which is used for forming soil after biological leaching and primarily separating soil and leaching waste liquid after biological leaching, and the effective volume of the deep-cone concentration tank is preferably 30m 3 . The slurry is initially separated in a deep cone thickener tank and then flows to dewaterer 402. Preferably, the dewatering machine 402 is a horizontal spiral centrifugal dewatering device for spiral separation of the washed waste liquid from the soil after the biological washing, the rotating speed of the horizontal spiral centrifugal dewatering device is set to be 1000-2000 r/min, and the dewatering machine can also be a stacked spiral dewatering device, a belt dewatering device and other dewatering devices. The elution waste liquid and the soil to be detected are separated by solid-liquid separation in a spiral centrifugal mode, the elution waste liquid flows into the waste liquid circulation treatment device, and the purified soil to be detected is discharged from a discharge port of the horizontal spiral centrifugal dehydration device and can be transported to the soil area to be detected. Preferably, the discharge port of the dewatering machine 402 may be provided with a fourth conveyor 105 for discharging the soil after solid-liquid separation to the soil test area. In addition, a slurry temporary storage device 306 is arranged between at least one biological leaching stirring device and the slurry concentration device.
The waste liquid recycling device comprises a water treatment device 403 for receiving and treating waste liquid after solid-liquid separation of the dehydrator 402, a biological bacteria liquid storage device 305 for separating heavy metal precipitate from biological leacheate and automatically adding medicaments for recycling the biological leacheate, and the waste liquid treated by the water treatment device 403 is conveyed to the biological leacheate storage device 305 for recycling. The water treatment device 403 and the biological leacheate storage device 305 are mainly used for treating the leaching waste liquid, regenerating and recycling the biological leacheate and dehydrating the generated heavy metal waste residues, the water treatment device 403 can be a three-level inclined-bottom conical sedimentation tank, a feeder and a stirring device are arranged in the inner space of the sedimentation tank, and a heavy metal precipitator is added through the feeder to precipitate heavy metals in the waste liquid recovered in the water treatment device and perform solid-liquid separation, so that the recyclable biological leacheate is obtained. Wherein, the stirring device of the water treatment device 403 ensures that the leaching waste liquid is fully contacted with the heavy metal precipitator, the rotating speed of the rotating stirring system is set to be 100-500 r/min, and after the reaction is finished, microorganisms partially enriched with heavy metals and inactivated microorganisms are precipitated at the bottom of the water treatment device. The treated leacheate is lifted to the biological leacheate storage device 305 through a lifting pump, the biological leacheate after water treatment is activated through the biological leacheate storage device 305, and the biological leacheate storage device 305 conveys the recovered biological leacheate to the biological spraying device 202 to spray or rinse soil in the primary screening device, so that cyclic utilization is achieved.
The heavy metals of the soil treated as referred to herein are primarily total chromium and total hexavalent chromium, and include other heavy metals such as mercury, cadmium, lead, copper, arsenic, nickel, iron, manganese, zinc, and the like.
In an embodiment not shown, the first conveyor 102, the second conveyor 103, the third conveyor 104, and the fourth conveyor 105 may be screw conveyors, belt conveyors, or other conveying means.
In another embodiment, not shown, the bioleaching solution is one or more of a biological bacterial solution (mainly secretion of bacteria), a biological bacterial species (bacteria such as bacillus) or an active microbial agent (mainly a mixture prepared by coupling nano materials and microbial species), and the preferred bioleaching solution is a mixture prepared by coupling iron-based nano materials and bacteria.
An operation flow of a biological leaching device for treating chromium-contaminated soil comprises the following specific steps:
crushing or removing stones with the particle size of about 5mm from the heavy metal polluted soil to be leached after crushing and screening of ALLU, and feeding the rest soil into a forklift from a feeding hopper 101;
conveying the heavy metal polluted soil to be leached to a primary screening device 201 through a first conveying device 102 for primary biological spraying and primary screening, and separating coarse sand from the soil;
the soil after primary spraying and screening enters a secondary screening device 203 to carry out secondary screening on the soil, and fine sand is separated from the small-particle-size polluted soil;
after secondary screening, slurry formed by mixing the small-particle-size polluted soil and the biological leacheate is conveyed to at least one biological leaching and stirring device (301, 302,303 and 304) according to the liquid level condition of the leaching and stirring device to be subjected to deep leaching and stirring so as to ensure that the whole process is continuous production rather than intermittent production, and the automatic dosing device supplements the biological leacheate to the biological leaching and stirring device regularly and quantitatively so as to ensure that the biological leacheate has sufficient quantity and activity;
conveying the soil slurry subjected to deep leaching and stirring to a dehydration device 4 for concentration and dehydration treatment, performing solid-liquid separation to obtain leaching waste liquid and purified soil, and discharging the leaching waste liquid and purified soil out of the device;
the separated leaching waste liquid is conveyed to a water treatment device 403 of the waste liquid circulation treatment device for advanced treatment, heavy metal precipitate is separated from the biological leaching liquid, and the treated biological leaching liquid is recycled to the biological leaching liquid storage device 305.
The biological leaching device for treating the chromium-polluted soil is adopted, and the mixture prepared by coupling the preferred iron-based nano material and bacteria is used for carrying out biological leaching treatment on the chromium-polluted soil. The chromium-polluted soil is taken from a certain chromium-polluted site of Changsha in Hunan, the total hexavalent chromium concentration of the collected soil sample is about 300mg/kg, the total chromium concentration of the soil is about 100mg/kg, five groups of experimental results after treatment show that the removal rates of the total hexavalent chromium in the soil are respectively 98.1%, 98.5%, 98.9%, 99.3% and 99.2%, the removal rates of the total hexavalent chromium in the soil can reach more than 98%, the removal rates of the total chromium are respectively 70.1%, 71.3%, 71.5%, 73.2% and 75.2%, the removal rates of the total hexavalent chromium in the soil can reach more than 70%, and compared with the traditional extensive type method in which leacheate is directly added from the soil, the removal rate of heavy metals, particularly the removal rate of the total chromium, is greatly improved.
The device can efficiently extract the heavy metal in the heavy metal contaminated soil through the leaching agent, firstly, the contaminated soil is subjected to primary biological spraying and two-stage screening, then, deep biological leaching is carried out, and finally, purified soil and leaching waste liquid are separated through the dewatering device. The biological leacheate is prepared by combining the nano material and the microorganism, the heavy metal is transferred from the solid-phase soil to the liquid-phase leacheate by utilizing the synergistic effect of the nano material and the microorganism, the biological leacheate can be recycled in the leaching process, and the aim of recovering or treating the heavy metal is finally fulfilled. By the method, the removal rate of total hexavalent chromium in the soil can reach more than 98%, the removal rate of total chromium can reach more than 70%, and compared with the traditional method of directly adding leacheate into the soil in an extensive manner, the removal rate of heavy metals, particularly the removal rate of total chromium, is greatly improved.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (9)
1. A biological leaching apparatus for treating heavy metal contaminated soil, the biological leaching apparatus comprising:
a feed conveyor;
the two-stage screening and biological spraying device comprises a primary screening device, a secondary screening device and a biological spraying device, wherein a feed inlet of the primary screening device is connected with the feeding conveying device, the biological spraying device is connected with the primary screening device, and a feed inlet of the secondary screening device is connected with a discharge outlet of the primary screening device;
the deep biological leaching device comprises at least one biological leaching and stirring device and an automatic dosing device, wherein the at least one biological leaching and stirring device is connected with a discharge port of the secondary screening device, and the automatic dosing device is connected with the at least one biological leaching and stirring device;
the dewatering device comprises a slurry concentration device and a dewatering machine, wherein a feed port of the slurry concentration device is connected with a discharge port of at least one biological leaching stirring device, and a discharge port of the slurry concentration device is connected with a feed port of the dewatering machine;
the waste liquid circulating treatment device comprises a water treatment device and a biological leacheate storage device, wherein the water treatment device is connected with a liquid outlet of the dehydrator and is connected with the biological leacheate storage device;
wherein, the bioleaching liquid storage device is connected with a biological spraying device in the two-stage screening and biological spraying device.
2. The bioleaching apparatus for treating heavy metal contaminated soil according to claim 1, wherein at least one bioleaching agitation apparatus of the deep bioleaching apparatus has 4 bioleaching agitation apparatuses, and the 4 bioleaching agitation apparatuses have a liquid level control apparatus and an agitation apparatus and are communicated with each other; the automatic dosing device comprises a dosing pipe communicated with the at least one biological leaching and stirring device and a tank body for storing biological leaching liquid.
3. The biological leaching device for treating heavy metal contaminated soil according to claim 1, wherein the feeding and conveying device comprises a feeding hopper and a first conveying device, a discharge port of the feeding hopper is connected with a feed port of the first conveying device, and a feed port of the primary screening device is connected with a discharge port of the first conveying device.
4. The biological leaching apparatus for treating heavy metal contaminated soil according to claim 1, wherein the primary screening device further comprises a second conveying device, and the secondary screening device further comprises a third conveying device.
5. The bioleaching device for treating heavy metal contaminated soil according to claim 1, wherein a slurry temporary storage device is arranged between the at least one bioleaching stirring device and the slurry concentration device, and a slurry temporary storage device is arranged between the secondary screening device and the at least one bioleaching stirring device.
6. The biological leaching device for treating heavy metal contaminated soil according to claim 1, wherein the discharge port of the dewatering machine is provided with a fourth conveying device.
7. The biological leaching apparatus for treating heavy metal contaminated soil according to claim 1 or 6, wherein the dewatering machine comprises one or more of a horizontal screw centrifugal dewatering device, a stacked screw dewatering device and a belt dewatering device.
8. The biological leaching apparatus for treating heavy metal contaminated soil according to claim 1 or 4, wherein the primary screening device and the secondary screening device are one or more of a drum type hydraulic screening device and a vibrating type hydraulic screening device.
9. The biological leaching device for treating heavy metal contaminated soil according to claim 1, wherein the water treatment device of the waste liquid recycling treatment device is a three-stage inclined bottom conical sedimentation tank, and the inner space of the sedimentation tank is provided with a feeder and a stirring device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222206201.XU CN218309996U (en) | 2022-08-22 | 2022-08-22 | Biological leaching device for treating heavy metal contaminated soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222206201.XU CN218309996U (en) | 2022-08-22 | 2022-08-22 | Biological leaching device for treating heavy metal contaminated soil |
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