CN214108289U - Electric enhanced leaching system for effectively removing pollutants in clay - Google Patents
Electric enhanced leaching system for effectively removing pollutants in clay Download PDFInfo
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- CN214108289U CN214108289U CN202022081957.7U CN202022081957U CN214108289U CN 214108289 U CN214108289 U CN 214108289U CN 202022081957 U CN202022081957 U CN 202022081957U CN 214108289 U CN214108289 U CN 214108289U
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Abstract
The utility model relates to an electric enhanced leaching system for effectively removing pollutants in clay, which consists of a leaching agent preparation tank, a leaching agent metering pump, a primary leaching tank, a first slurry pump, an electric enhanced leaching tank, a pulse power supply, a second slurry pump and a mud-water separator; the utility model provides an electronic intensive drip washing system of pollutant in effective getting rid of clay, through exerting the two-way pulse voltage of specific shape, size, frequency at electronic intensive drip washing groove both ends for the pollutant in the clay granule oscillates back and forth repeatedly under the effect of two-way pulse voltage of high frequency, finally breaks away from the strong adsorption affinity of clay granule, resolves in the liquid phase, thereby is caught by the eluent; meanwhile, the bidirectional pulse voltage enhances the mass transfer rate of the eluent, so that the eluent can enter the clay particles to capture pollutants. By the means, the leaching efficiency and the removal effect of pollutants in the clay are greatly improved.
Description
Technical Field
The utility model belongs to the technical field of the environmental remediation, concretely relates to electronic intensive drip washing system suitable for get rid of pollutant in clay.
Background
The ectopic soil leaching technology is a soil remediation technology which is used for digging out contaminated soil, cleaning the soil with clear water or a chemical leaching agent, removing pollutants and then treating cleaning wastewater or waste liquid containing the pollutants. The ectopic soil leaching process can elute pollutants in soil through the steps of crushing, screening, mixing and stirring, dewatering, water treatment and the like, and the leached clean soil can be backfilled in situ or transported outside for disposal. Compared with a solidification and stabilization technology, the soil leaching technology belongs to a pollution source reduction and restoration technology, and the environmental risk is smaller.
The ectopic soil leaching technology can be used for treating pollutants such as heavy metals, petroleum, halogenated hydrocarbons and the like, is more effective for repairing the polluted soil with large particle size grade, and pollutants in gravel, sand, fine sand and similar soil are easier to be cleaned out, while the pollutants in clay are harder to be cleaned out.
The types of the polluted soil in southern areas of China mainly comprise clay and powdery clay, the clay has larger specific surface area and surface energy, so that the clay has stronger adsorption performance on pollutants, and the low permeability of the clay hinders the elution agent from diffusing into clay particles, so that the pollutants are difficult to be resolved into a liquid phase under the action of the elution agent, and the elution efficiency and the pollutant removal effect are inevitably influenced. Patentee Shanghai Kangheng environmental remediation Limited company's all grant publication No. CN 208131664U, the utility model patent of the name "equipment for modular soil leaching", discloses a contain soil screening plant, clean device, hierarchical screening plant and water treatment facilities. The device has the functions of leaching and screening, so that the space utilization rate is improved; the soil is separated according to the particle size while the soil is washed, and the resource utilization rate of the soil is improved. However, when the clay content in the soil is more than 25%, the apparatus is difficult to function, and even if the amount of the eluting agent is increased or the eluting time is prolonged, the removing effect is difficult to achieve.
Therefore, the development of a set of ectopic leaching system for effectively removing pollutants in clay is of great significance on the basis of the existing modularized soil leaching equipment of the utility model human aiming at the high-viscosity polluted soil in the south region.
SUMMERY OF THE UTILITY MODEL
The utility model provides an above-mentioned problem, provide an effective electronic intensive drip washing system who gets rid of pollutant in clay, through the two-way pulse voltage who applys specific shape, size, frequency at drip washing groove both ends, utilize the oscillating action of electrokinetic in the pollutant in with the clay granule is analyzed to the liquid phase.
The utility model discloses technical scheme as follows:
an electric enhanced leaching system for effectively removing pollutants in clay comprises a leaching agent preparation tank 1, a leaching agent metering pump 2, a primary leaching tank 3, a first slurry pump 4, an electric enhanced leaching tank 5, a pulse power supply 6, a second slurry pump 7 and a mud-water separator 8;
wherein the eluent preparation tank 1 is provided with a first stirrer 11 for stirring and dissolving the eluent; the prepared eluent is conveyed to a primary eluent tank 3 through an eluent metering pump 2; a feed hopper 31 for receiving the screened and crushed soil and a second stirrer 32 for mixing the soil and the eluting agent are arranged on the primary eluting tank 3; the slurry in the primary spray washing tank 3 is conveyed to an electric enhanced spray washing tank 5 through a first slurry pump 4; an electrode plate 51 and an inner wall clamping groove 52 are arranged in the electric enhanced spray washing tank 5, and except the electrode plate 51, other structures in the electric enhanced spray washing tank 5 are sprayed with insulating corrosion-resistant wear-resistant paint; the electrode plate 51 is usually made of a titanium alloy plate, the inner wall clamping groove 52 is of a thin-wall structure, and the width of the clamping groove is matched with the thickness of the electrode plate 51, so that the electrode plate 51 is fixed in the clamping groove; the pulse power supply 6 is used for generating bidirectional pulse voltage with the frequency of 1000-10000 Hz and the voltage of 2-25V; the mud after the enhanced washing is conveyed to a mud-water separator 8 through a second mud pump 7; the mud-water separator 8 is composed of a flocculant dosing tank 81 and a screw shaft 82.
Furthermore, the electric enhanced spray washing tank is subjected to insulation treatment except for the electrode plate.
Further, the residence time of the slurry in the electric enhanced leaching tank should be longer than that of the slurry in the primary leaching tank.
Further, the frequency of the bidirectional pulse voltage generated by the pulse power supply is greater than 1000Hz, and the voltage is less than 25V.
The working process of the utility model is as follows:
(1) and (3) adding the soil (with the particle size less than 5mm) which is sieved and crushed by the modular leaching equipment into the primary leaching tank, starting the leaching agent preparation tank and the metering pump while adding, conveying the leaching agent into the primary leaching tank, and starting a second stirrer on the primary leaching tank to fully mix the soil and the leaching agent to form uniform slurry.
(2) And (3) conveying the slurry stirred for a certain time in the primary leaching tank to a pulse intensified leaching tank through a first slurry pump, starting a pulse power supply, and performing electric intensified leaching through high-frequency bidirectional pulse voltage.
(3) After the electrically enhanced leaching is finished, the slurry is conveyed to a mud-water separator through a second slurry pump, mud-water separation is realized through the addition of a flocculating agent and the extrusion action of a spiral shaft, the dewatered soil is discharged as clean soil, and the wastewater is conveyed to a water treatment terminal for treatment.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides an electronic intensive drip washing system of pollutant in effective getting rid of clay, through exerting the two-way pulse voltage of specific shape, size, frequency at electronic intensive drip washing groove both ends for the pollutant in the clay granule oscillates back and forth repeatedly under the effect of two-way pulse voltage of high frequency, finally breaks away from the strong adsorption affinity of clay granule, resolves in the liquid phase, thereby is caught by the eluent; meanwhile, the bidirectional pulse voltage enhances the mass transfer rate of the eluent, so that the eluent can enter the clay particles to capture pollutants. By the means, the leaching efficiency and the removal effect of pollutants in the clay are greatly improved.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a top view of the electrically enhanced shower bath.
Fig. 3 is a left side view of the electrically enhanced shower bath.
Fig. 4 is a graph showing the change in lead concentration before and after rinsing in example 1.
FIG. 5 is a graph showing the change in cadmium concentration before and after rinsing in example 1.
Fig. 6 is a graph showing the change in concentration of contaminants before and after elution in example 2.
Description of reference numerals: 1. the leaching agent preparation tank comprises a leaching agent preparation tank 11, a first stirrer 2, a leaching agent metering pump 3, a primary leaching tank 31, a feed hopper 32, a second stirrer 4, a first slurry pump 5, an electric enhanced leaching tank 51, an electrode plate 52, an inner wall clamping groove 6, a pulse power supply 7, a second slurry pump 8, a mud-water separator 81, a flocculating agent dosing tank 82 and a screw shaft.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not intended to limit the present invention.
It should be noted that the description of the present invention, referring to the orientation or position indication (such as up, down, left, right, front, back, center, etc.), is based on the orientation or position relation shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, fig. 2 and fig. 3, the electric enhanced leaching system for effectively removing the pollutants in the clay provided by the present invention comprises a leaching agent preparation tank 1, a leaching agent metering pump 2, a primary leaching tank 3, a first slurry pump 4, an electric enhanced leaching tank 5, a pulse power supply 6, a second slurry pump 7 and a mud-water separator 8.
Wherein the eluent preparation tank 1 is provided with a first stirrer 11 for stirring and dissolving the eluent; the prepared eluent is conveyed to a primary eluent tank 3 through an eluent metering pump 2; a feed hopper 31 for receiving the screened and crushed soil and a second stirrer 32 for mixing the soil and the eluting agent are arranged on the primary eluting tank 3; the slurry in the primary spray washing tank 3 is conveyed to an electric enhanced spray washing tank 5 through a first slurry pump 4; an electrode plate 51 and an inner wall clamping groove 52 are arranged in the electric enhanced spray washing tank 5, and except the electrode plate 51, other structures in the electric enhanced spray washing tank 5 are sprayed with insulating corrosion-resistant wear-resistant paint; the electrode plate 51 is usually made of a titanium alloy plate, the inner wall clamping groove 52 is of a thin-wall structure, and the width of the clamping groove is matched with the thickness of the electrode plate 51, so that the electrode plate 51 is fixed in the clamping groove; the pulse power supply 6 is used for generating bidirectional pulse voltage with the frequency of 1000-10000 Hz and the voltage of 2-25V; the mud after the enhanced washing is conveyed to a mud-water separator 8 through a second mud pump 7; the mud-water separator 8 is composed of a flocculant dosing tank 81 and a screw shaft 82.
The working process of the utility model is as follows:
(1) the method comprises the steps of feeding the soil (with the particle size less than 5mm) which is sieved and crushed by modular leaching equipment into a primary leaching tank 3, starting a leaching agent preparation tank 1 and a metering pump 2 at the same time of feeding, conveying a leaching agent into the primary leaching tank 3, and starting a second stirrer 32 on the primary leaching tank to fully mix the soil and the leaching agent to form slurry with uniform texture.
(2) The slurry stirred for a certain time in the primary leaching tank 3 is conveyed into a pulse strengthening leaching tank 5 through a first slurry pump 4, a pulse power supply 6 is started to generate high-frequency bidirectional pulse voltage, so that pollutants in clay particles are repeatedly oscillated back and forth under the action of the high-frequency bidirectional pulse voltage, the strong adsorption force of the clay particles is finally eliminated, and the pollutants are resolved into a liquid phase and are captured by a leaching agent; meanwhile, the bidirectional pulse voltage enhances the mass transfer rate of the eluent, so that the eluent can enter the clay particles to capture pollutants.
(3) The mud after the electric enhanced washing is conveyed to a mud-water separator 8 through a second mud pump 7, mud-water separation is realized through the addition of a flocculating agent and the extrusion action of a screw shaft, the dewatered soil is discharged as clean soil, and the wastewater is conveyed to a water treatment terminal for treatment.
The present invention provides an electro-enhanced leaching system for removing contaminants from clay, which is further described with reference to the following embodiments.
Example 1
Site characteristics: in a heavy metal polluted land, the pollutants are lead and cadmium, wherein the maximum lead concentration is 1910mg/kg, the maximum cadmium concentration is 235mg/kg, the lead restoration target value is 800mg/kg, the cadmium restoration target value is 65mg/kg, the pollution depth is 1.5m, and the pollution area is 554.5m2Repair volume 831.8m3The polluted soil is mainly gray yellow powdery clay, the surface layer is 0.3m and contains a small amount of miscellaneous fill, and the ectopic soil leaching technology is adopted for remediation.
The technical parameters are as follows: each item was selected to be 100m3Carrying out an electric enhanced leaching test on the polluted soil, wherein the leaching agent selected by the experimental group is disodium ethylene diamine tetraacetate (EDTA-2Na), the addition ratio is 0.2%, and the solid-liquid ratio is selected from 1: 4, the residence time of the primary spray washing tank is 0.5h, the residence time of the electric reinforced spray washing tank is 1h, the bidirectional pulse voltage frequency is 5000Hz, the size is 20V, the electrode plate is a titanium alloy plate, and the equipment processing capacity is 5m3H; the control group maintains one with the experimental group except that the electrically enhanced rinsing bath is not openedThus, the method can be used for the treatment of the tumor.
Fig. 4 is a graph showing the change in lead concentration before and after rinsing in example 1. FIG. 5 is a graph showing the change in cadmium concentration before and after rinsing in example 1.
And (4) analyzing results: after the contaminated soil of the experimental group is subjected to electric enhanced leaching, the average lead concentration in the soil is reduced from 1563.2mg/kg to 80.1mg/kg, the removal rate is 94.9%, the cadmium concentration is reduced from 201.5mg/kg to 8.86mg/kg, and the removal rate is 95.6%; the lead concentration in the soil of the control group is reduced from 1698.5mg/kg to 968.6mg/kg, the target restoration value is not reached, the removal rate is 42.9 percent, the cadmium concentration is reduced from 197.7mg/kg to 49.4mg/kg, and the removal rate is 75.0 percent.
From the results, compared with the control group, the removal rates of lead and cadmium in the soil of the experimental group are greatly improved to be more than 90% and far lower than the remediation target value, which indicates that the removal efficiency and leaching efficiency of pollutants in the clay can be greatly improved by applying high-frequency bidirectional pulse voltage to the two ends of the leaching tank.
Example 2
Site characteristics: in a polluted land, the heavy metal pollutants are copper, lead and antimony, and the pollution formula amount is 2100m3And the pollution depth is 3m, wherein the maximum copper concentration is 2110mg/kg, the restoration target value is 800mg/kg, the cadmium restoration target value is 667mg/kg, the maximum lead concentration is 290mg/kg, the restoration target value is 140mg/kg, the maximum antimony concentration is 12.5mg/kg, the restoration target value is 6.67mg/kg, the polluted soil is gray yellow silty clay and gray silty clay, and the in-situ ectopic electric enhanced leaching technology is adopted for restoration.
The technical parameters are as follows: the eluting agent selected by the project is citric acid, the adding ratio is 0.3%, and the solid-liquid ratio is selected from 1: 4, the residence time of the primary spray washing tank is 0.5h, the residence time of the electric reinforced spray washing tank is 1h, the frequency of the bidirectional pulse voltage is 8000Hz, the size is 24V, the electrode plate is a titanium alloy plate, and the equipment processing capacity is 5m3/h。
Fig. 6 is a graph showing the change in concentration of contaminants before and after elution in example 2.
And (4) analyzing results: after the heavy metal contaminated soil is subjected to electric enhanced leaching, the average concentration of copper in the soil is reduced from 1964mg/kg to 118mg/kg, the removal rate is 94%, the concentration of lead is reduced from 265mg/kg to 15.1mg/kg, the removal rate is 94.3%, the concentration of antimony is reduced from 11.3mg/kg to 2.35mg/kg, and the removal rate is 79.2%. The content of the three pollutants is lower than the target repairing value, and the repairing requirement is met.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (1)
1. An electric enhanced leaching system for effectively removing pollutants in clay is characterized by comprising a leaching agent preparation tank, a leaching agent metering pump, a primary leaching tank, a first slurry pump, an electric enhanced leaching tank, a pulse power supply, a second slurry pump and a mud-water separator;
wherein the first stirrer is arranged on the eluent preparation tank and is used for stirring and dissolving the eluent; the prepared eluent is conveyed to a primary eluent tank through an eluent metering pump; the primary leaching tank is provided with a feed hopper for receiving the screened and crushed soil and a second stirrer for mixing the soil and the leaching agent; the slurry in the primary leaching tank is conveyed to the electric enhanced leaching tank through a first slurry pump; the electric enhanced spray washing tank is internally provided with a plate electrode and an inner wall clamping groove; the electrode plate is made of a titanium alloy plate, the clamping groove on the inner wall is of a thin-wall structure, and the width of the clamping groove is matched with the thickness of the electrode plate, so that the electrode plate is fixed in the clamping groove; the pulse power supply generates bidirectional pulse voltage; conveying the slurry subjected to the enhanced leaching to a mud-water separator through a second slurry pump; the mud-water separator consists of a flocculant dosing tank and a spiral shaft.
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| CN202022081957.7U CN214108289U (en) | 2020-09-21 | 2020-09-21 | Electric enhanced leaching system for effectively removing pollutants in clay |
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