CN107309263A - The chemical leaching separation method and its piece-rate system of pollutant in high concentration, complete circulation type soil, solid waste - Google Patents

The chemical leaching separation method and its piece-rate system of pollutant in high concentration, complete circulation type soil, solid waste Download PDF

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CN107309263A
CN107309263A CN201710719568.2A CN201710719568A CN107309263A CN 107309263 A CN107309263 A CN 107309263A CN 201710719568 A CN201710719568 A CN 201710719568A CN 107309263 A CN107309263 A CN 107309263A
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rinsing
pollutant
concentration
soil
leacheate
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CN107309263B (en
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张晨
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张晨
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/02Extraction using liquids, e.g. washing, leaching, flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/26Treatment of water, waste water, or sewage by extraction
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds

Abstract

The invention provides a kind of high concentration, complete circulation type soil, the chemical leaching separation method and its piece-rate system of pollutant in solid waste, wherein, the separation method is first by the high concentration leacheate and soil in chemical leaching step, pollutant in solid waste reacts, make soil, pollutant in solid waste is dissolved in leacheate as solute, then again by countercurrent rinsing step will elute after soil, it is mingled with solid waste in solution and is come out as the pollutant of solute by rinsing liquid aliquot replacement, until soil, it is mingled with solid waste after the pollutant concentration of solution is equal to management goal concentration and is discharged, reach that improvement is required.And regeneration cycle step dynamically starts during the progress of chemical leaching step and countercurrent rinsing step, make soil, solid waste during whole pollutant process, keep the constant concentration of pollutant in the volume and leacheate of leacheate, to realize stable circulation, the system can realize above-mentioned elution separation method.

Description

The chemical leaching separation side of pollutant in high concentration, complete circulation type soil, solid waste Method and its piece-rate system
Technical field
The present invention, which is disclosed, is related to the technical field that soil, solid waste pollution are administered, more particularly to a kind of high concentration, Quan Xun The chemical leaching separation method and its piece-rate system of ring type soil pollutant.
Background technology
At present, when carrying out soil pollutant improvement, generally using chemical leaching method.This method is mainly will be containing elution The leacheate of agent is in contact with pending soil or solid waste, makes the pollutant in material and the eluent phase in leacheate Interaction, by physics, chemical processes such as desorption, chelating, complexing, dissolving or extractions, makes pollutant be transferred in leacheate, with Realize the purification of the materials such as soil or solid waste.
However, existing chemical leaching method is when carrying out soil, solid waste pollution improvement, generally existing secondary pollution Load is serious and the problems such as too high operating cost, causes it to be promoted and used on a large scale in engineering field. For example:Certain dry weight is 10t soil, and its pollutant lead content is 1000mg/kg, and it is to contain lead in soil to repair target Amount is reduced to below 150mg/kg;It 21% (is the quality of moisture content of drying base, i.e. water and arid soil that the actual moisture content of the soil, which is, Than similarly hereinafter), the saturated aqueous rate of this kind of soil is 52%, and saturated aqueous soil is used after economically viable dewatering means, its Moisture content can drop to 30%.To realize the reparation target, the improvement for taking existing chemical leaching method to be polluted is specially: Concentration is used to carry out chemical leaching for the 0.01~0.1mol/L sodium solutions of EDTA- bis-, after 1h or so chelatropic reaction, soil Earth Central Plains is present in the efficiency that the lead in solid phase is eluted and enters liquid phase up to 90%, and with the solute form of lead chelate.It is existing Have in chemical leaching technique, liquid-solid ratio parameter (ratio of leacheate quality and soil quality), for final process effect and useless Aquatic products measurer has conclusive influence, for ensure treatment effect, existing chemical leaching technique generally selected liquid-solid ratio be 2~ 10 (liquid with solid masses ratios), therefore, exemplified by we are 2.0,2.85 and 5.4 3 kind of situation according to liquid-solid ratio respectively, come Analyze the production of waste water in existing chemical leaching method technique:
1) when the liquid-solid ratio of selection is 2.0:
It is 20m that volume is added into soil3, concentration for 0.01~0.1mol/L the sodium solutions of EDTA- bis- carry out chemistry Elution, after 1h chelatropic reaction, the efficiency that the lead in soil is eluted be 90%, into leacheate lead total amount for 9kg, Concentration is 450mg/L;Separation of solid and liquid is carried out to the soil after chemical leaching, soil moisture content is 30% after separation, water content is 3m3, separation process formation lead content 7.65kg, concentration 450mg/L eluate 17m3;After separation of solid and liquid, what is remained in soil consolidates Phase, lead quality is not eluted for 1kg, 3m is remained in soil3Leacheate in Chelating state lead quality be 1.35kg, in solid phase, liquid phase Total lead quality is 2.35kg, in terms of soil dry weight 10t, and its total lead content is 235mg/kg, and not up to 150mg/kg's repaiies Complicated target, it is therefore necessary to be at least introduced back into the soil after chemical leachingClear water it is rinsed, after rinsing again Secondary separation of solid and liquid to soil moisture content is 30%, and now lead quality is down to lead total in 0.5kg, solid phase, liquid phase in liquid phase of soil Quality is down to 1.5kg, reaches 150mg/kg reparation target, while the Chelating state lead for having 0.85kg enters the wash-off of rinse cycle In liquid, lead concentration 166.67mg/L eluate 5.1m is formed3.To sum up, when using liquid-solid ratio for 2.0, lead concentration will be produced 450mg/L eluate 17m3, lead concentration 166.67mg/L eluate 5.1m3, amount to eluate wastewater flow rate 22.1m3.It is above-mentioned If waste water is re-used for the similar soil chemistry elution of other batches, the solution pollutant remained after elution in soil is dense Degree be will increase further, and be rinsed to realize that management goal must be introduced into more clear water, and generation is more washed therefrom Go out liquid, therefore, the multiplexing of above-mentioned waste water is difficult to substantially reduce the purpose of wastewater flow rate.
2) when the liquid-solid ratio of selection is 4.0:
It is 40m that volume is added into soil3, concentration for 0.01~0.1mol/L the sodium solutions of EDTA- bis- carry out chemistry Elution, after 1h chelatropic reaction, the efficiency that the lead in soil is eluted be 90%, into leacheate lead total amount for 9kg, Concentration is 225mg/L;Separation of solid and liquid is carried out to the soil after chemical leaching, soil moisture content is 30% after separation, water content is 3m3, separation process formation lead content 8.325kg, concentration 225mg/L eluate 37m3;After separation of solid and liquid, remained in soil Solid phase, lead quality is not eluted for 1kg, 3m is remained in soil3Leacheate in Chelating state lead quality be 0.675kg, solid phase, liquid phase In total lead quality be 1.675kg, in terms of soil dry weight 10t, its total lead content is 167.5mg/kg, not up to 150mg/kg Reparation target, it is therefore necessary to be at least introduced back into 1.05m into the soil after chemical leaching3Clear water it is rinsed, rinse Separation of solid and liquid to soil moisture content is 30% again afterwards, and now lead quality is down in 0.5kg, solid phase, liquid phase always in liquid phase of soil Lead quality be down to 1.5kg, 150mg/kg reparation target is reached, while the Chelating state lead for having 0.175kg enters rinse cycle Eluate in, form lead concentration 166.67mg/L eluate 1.05m3.To sum up, when using liquid-solid ratio for 4.0, it will produce Lead concentration 225mg/L eluate 37m3, lead concentration 166.67mg/L eluate 1.05m3, amount to eluate wastewater flow rate 38.05m3
3) when the liquid-solid ratio of selection is 5.4:
It is 54m that volume is added into soil3, concentration for 0.01~0.1mol/L the sodium solutions of EDTA- bis- carry out chemistry Elution, after 1h chelatropic reaction, the efficiency that the lead in soil is eluted be 90%, into leacheate lead total amount for 9kg, Concentration is 166.667mg/L;Separation of solid and liquid is carried out to the soil after chemical leaching, soil moisture content is 30% after separation, aqueous Measure as 3m3, separation process formation lead content 8.5kg, concentration 166.667mg/L eluate 51m3;After separation of solid and liquid, in soil The solid phase of residual, lead quality is not eluted for 1kg, 3m is remained in soil3Leacheate in Chelating state lead quality be 0.5kg, solid phase, Total lead quality is 1.5kg in liquid phase, in terms of soil dry weight 10t, and its total lead content is 150mg/kg, reaches 150mg/kg's Repair target.To sum up, when using liquid-solid ratio for 5.4, the eluate wastewater flow rate by lead concentration 166.667mg/L is produced is amounted to 51m3
To sum up, it can be produced although existing chemical leaching method can be realized in the improvement of pollutant in soil, governance process A large amount of waste water containing low concentration pollutant, if these waste water discharged, certainly will cause serious secondary pollution;If will These substantial amounts of low concentration wastewaters are administered, then can produce high operating cost, economically will be difficult to bear again.
Therefore, a kind of chemical leaching separation method of new soil pollutant how is researched and developed, to solve the above problems, is turned into People's urgent problem to be solved.
The content of the invention
In consideration of it, the present disclosure provides a kind of chemistry of pollutant in high concentration, complete circulation type soil, solid waste Separation method and its piece-rate system are eluted, to solve conventional chemical leaching method when carrying out soil, solid waste pollution improvement, The secondary pollution load of generally existing is serious and the problems such as too high operating cost.
One aspect of the present invention provides a kind of chemical leaching of pollutant in high concentration, complete circulation type soil, solid waste Separation method, the separation method comprises the following steps:
Chemical leaching:Pending soil, solid waste are put into leacheate and carried out after chemical leaching, then carry out it is solid, Liquid is separated, soil, solid waste after must eluting, wherein, the constant volume of the leacheate contains eluent in the leacheate And in pollutant, and the leacheate pollutant constant concentration, the constant density value of the pollutant is N times of the soil It is mingled with the pollutant control aimed concn of solution in earth, solid waste;
Countercurrent rinsing:Soil, solid waste after above-mentioned elution are subjected to countercurrent rinsing, until the soil, solid waste In be mingled with solution pollutant concentration be equal to the management goal concentration, by the soil after countercurrent rinsing, solid waste discharge, together When the eluate after countercurrent rinsing is input in the leacheate of chemical leaching step, wherein, the rinsing of countercurrent rinsing effect Rate is N, is mingled with soil after pollutant concentration/countercurrent rinsing of solution in soil, solid waste before the N=countercurrent rinsings, consolidates It is mingled with the pollutant concentration of solution, and N >=2 in body waste;
Regeneration cycle:When the concentration of pollutant in the leacheate is more than the constant density of setting, by the leacheate Part output carries out pollutant extraction, the leacheate extracted after pollutant is returned in the leacheate of chemical leaching step or will Eluate after the countercurrent rinsing is carried out after pollutant extraction, and the eluate extracted after pollutant is returned into chemical leaching step In rapid leacheate, until pollutant concentration is equal to the constant density of setting in the leacheate;When the volume of the leacheate More than setting constant volume when, leacheate part output is subjected to counter-infiltration, penetrating fluid and concentrated solution is obtained or will be described Eluate after countercurrent rinsing carries out counter-infiltration, obtains penetrating fluid and concentrated solution, and the concentrated solution is returned into chemical leaching step In rapid leacheate, until the leacheate volume is equal to the constant volume of setting.
It is preferred that, the pollutant is organic matter, and the eluent is the organic solution or described that can dissolve the organic matter Pollutant is the heavy metal compound for being insoluble in water, and the eluent is chelating agent, acid or alkali;Or the pollutant is to be soluble in The heavy metal compound of water, the eluent is water.
Further preferably, multiple potchers are disposed with the countercurrent rinsing step, soil, solid after the elution Waste is transported in first potcher in batches, after the rinsing liquid in first potcher is rinsed, after rinsing Soil, solid waste are transferred in second potcher, are rinsed by the rinsing liquid in second potcher, by that analogy, Until soil, solid waste are removed after the rinsing liquid rinsing in last potcher, wherein, when last potcher When pollutant concentration reaches pollutant control aimed concn in middle rinsing liquid, the rinsing liquid in first potcher is regard as wash-off Liquid is discharged, and the rinsing liquid in second potcher is moved on to as rinsing liquid in first potcher, by that analogy, until will After rinsing liquid in last potcher is moved on in potcher thereon as rinsing liquid, mended in last potcher Enter fresh rinsing liquid.
Further preferably, a plurality of countercurrent rinsing branch road, every countercurrent rinsing branch road are provided with the countercurrent rinsing step In be provided with countercurrent rinsing unit;
Soil, solid waste are sequentially input on different countercurrent rinsing branch roads after the elution, respectively via each described inverse Countercurrent rinsing unit on stream rinsing branch road carries out repeatedly interim rinsing, until being mingled with solution in the soil, solid waste Pollutant concentration be equal to management goal concentration, each rinsing liquid volume is identical in the countercurrent rinsing unit;
Wherein, the eluate after being rinsed for the first time in rinse unit on every countercurrent rinsing branch road is input to chemical leaching In the leacheate of step, and the eluate on the M articles countercurrent rinsing branch road in rinse unit after the W times rinsing is input to M+ Rinsing liquid on 1 article of countercurrent rinsing branch road in rinse unit as the rinsing of the rinse unit the W-1 times, and the M be more than etc. In 1 natural number, the W is the natural number more than or equal to 2.
Further preferably, the interim rinsing includes successively every time:Stirring rinsing and separation of solid and liquid.
Further preferably, in the regeneration cycle step, the penetrating fluid is input in countercurrent rinsing step and is used as drift Washing lotion.
Another aspect of the present invention additionally provides the chemical leaching segregative line of a kind of high concentration, complete circulation type pollutant in soil System, the system is applied to above-mentioned chemical leaching separation method, and the system includes:It is conveying device 2, equipment for separating liquid from solid 3, inverse Flow rinsing device 4, reverse osmosis unit 5, pollutant extraction element 6 and the chemical leaching device 1 for holding leacheate;
It is separately provided for detecting the Concentration Testing of pollutant concentration in the leacheate in the chemical leaching device 1 Device 11 and the volume detector 12 for detecting the leacheate volume, the solid output end of the chemical leaching device 1 and institute State the input connection of conveying device 2;
The output end of the conveying device 2 is connected with the input of the equipment for separating liquid from solid 3;
The solid output end of the equipment for separating liquid from solid 3 passes through pipeline 7 and the solid input of the countercurrent rinsing device 4 Connection, and valve 71 is provided with the pipeline 7, fluid output port and the chemical leaching of the equipment for separating liquid from solid 3 are filled The fluid input port for putting 1 is connected;
The infiltration of the fluid input port of the countercurrent rinsing device 4 respectively with fresh water source and the reverse osmosis unit 5 Liquid output end is connected, and the fluid input port of the fluid output port of the countercurrent rinsing device 4 and the chemical leaching device 1 connects Connect;
The input of the reverse osmosis unit 5 is connected with the fluid output port of the chemical leaching device 1, the counter-infiltration The concentrated solution output end of device 5 is connected with the fluid input port of the chemical leaching device 1;
The input of the pollutant extraction element 6 is connected with the fluid output port of the chemical leaching device 1, the dirt The fluid output port of dye thing extraction element 6 is connected with the fluid input port of the chemical leaching device 1;
Wherein, the output end of the concentration detector 11 is connected with the control end of the pollutant extraction element 6, the body The output end of product detector 12 is connected with the control end of the reverse osmosis unit 5.
It is preferred that, the countercurrent rinsing device 4 is made up of multiple countercurrent rinsing branch roads 41 being arranged in parallel successively, and each inverse Rinsing device 411 and the temporary storage tank 412 of eluate are respectively arranged with stream rinsing branch road 41;
Wherein, the solid output end that the solid input of the rinsing device 411 passes through pipeline 7 and equipment for separating liquid from solid 3 Connection, and be provided with valve 71 on the pipeline 7, the fluid input port of the rinsing device 411 respectively with fresh water source and The penetrating fluid output end connection of the reverse osmosis unit 5, fluid output port and the eluate of the rinsing device 411 are temporarily stored up The input connection of tank 412;
The output end of the temporary storage tank 412 of eluate respectively with the fluid input port of the chemical leaching device 1 and under The fluid input port connection of rinsing device 411 in one countercurrent rinsing branch road 41;
Wherein, the rinsing device 411 is filter-pressing device;
Or the rinsing device 411 include housing 4111, rotating cabin 4112, the first motor 4113, puddler 4114 and Second motor 4115;
Through hole is arranged at intervals with the rotating cabin 4112, the rotation of rotating cabin 4112 is installed in the housing 4111 Portion;
The output end of first motor 4113 and the upper end drive connection of the puddler 4114, the puddler 4114 Lower end be inserted in the inside of the rotating cabin 4112;
The drive end of second motor 4115 and the drive connection of rotating cabin 4112.
Further preferably, the input of the output end of the temporary storage tank 412 of the eluate also respectively with the reverse osmosis unit 5 Connected with the input of the pollutant extraction element 6.
Further preferably, input of the concentrated solution output end of the reverse osmosis unit 5 also with the pollutant extraction element 6 End connection.
Further preferably, the pollutant extraction element 6 is electrodialysis plant or extraction equipment.
The chemical leaching separation method of pollutant in high concentration that the present invention is provided, complete circulation type soil, solid waste, it is main It is divided into chemical leaching step, countercurrent rinsing step and regeneration cycle step, wherein, first by the height in chemical leaching step Concentration leacheate reacts with the pollutant in soil, solid waste, makes the pollutant in soil, solid waste as solute It is dissolved in leacheate, then will be mingled with again by countercurrent rinsing step in soil, solid waste after elution in solution and be used as solute Pollutant come out by rinsing liquid aliquot replacement, until soil, solid waste in be mingled with solution pollutant concentration be equal to control Discharged after reason aimed concn, reach that improvement is required.And regeneration cycle step is walked in chemical leaching step and countercurrent rinsing Dynamically start during rapid progress, by the startup of the regeneration cycle step, soil, solid waste can be made in whole pollutant In processing procedure, the constant concentration of pollutant in the volume and leacheate of leacheate is kept, to realize stable circulation.The present invention The chemical leaching separation method of offer, on the one hand can be by the pollution in soil, solid waste by the setting of high concentration leacheate Thing is converted into solute and is dissolved in leacheate, facilitates the progress of follow-up countercurrent rinsing step;On the other hand, for any stable fortune Capable removes in soil, solid waste for the method for pollutant, and the pollutant gross mass removed in its unit interval is perseverance Definite value, therefore, flows through the solution pollutant concentration that pollutant extraction is carried out in regeneration cycle step, liquid inventory, pollutant and goes Except the product of rate three is steady state value, discounting for the difference of removal efficiency, then solution concentration and liquid inventory are in inverse proportion Relation.Application claims are delivered to chemical leaching liquid at pollutant extraction, the concentrated solution of counter-infiltration, and its pollutant concentration is at least For N times of the pollutant concentration that is mingled with solution in the soil after improvement, solid waste, and N >=2, its principle is to pass through Significantly lifting is delivered in the solution at pollutant extraction pollutant concentration to a certain high concentration value so that pollutant, which is extracted, to be needed Amount of solution to be processed is accordingly greatly reduced.In addition, improving what pollutant concentration value in solution was extracted for improving pollutant For treatment effeciency, generally with positive effect, it can correspondingly cause pollutant is extracted to need amount of solution to be processed further Reduce.Further, since the invention enables needing the amount of solution of pollutant extraction process to be greatly decreased, it is low dense therefore, it is possible to avoid Waste water largely outer row is spent, the corresponding loss amount for causing chemical leaching is greatly decreased.
High concentration that the present invention is provided, the chemical leaching piece-rate system of complete circulation type pollutant in soil, it is adaptable to above-mentioned Chemical leaching separation method, it is reasonable in design with simple in construction, the advantages of easy to use.
Brief description of the drawings
Accompanying drawing herein is merged in specification and constitutes the part of this specification, shows the implementation for meeting the present invention Example, and for explaining principle of the invention together with specification.
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art Speech, on the premise of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1, which is disclosed for the present invention in a kind of high concentration that embodiment provides, complete circulation type soil, solid waste, pollutes materialization Learn the schematic flow sheet of elution separation method;
Fig. 2 discloses the chemical leaching of a kind of high concentration that embodiment provides, complete circulation type pollutant in soil for the present invention The structural representation of piece-rate system, wherein, 8 represent that slag, local product hopper, 9 represent supplement eluent;
Fig. 3 discloses the chemical leaching of a kind of high concentration that embodiment provides, complete circulation type pollutant in soil for the present invention The structural representation of piece-rate system, wherein, 8 represent that slag, local product hopper, 9 represent supplement eluent.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended The example of the consistent apparatus and method of some aspects be described in detail in claims, the present invention.
Due to the chemical leaching method used in the prior art, during soil renewal or Solid Waste Treatment, generally The phenomenon big in the presence of wastewater flow rate is produced, therefore problems with can be produced:1) a large amount of waste water, the generation of waste liquid will increase by two secondary environments The risk of pollution;If 2) carry out purification treatment to produced a large amount of waste water, waste liquid, its high waste water treatment cost is in warp It is probably to be difficult to what is born in Ji;3) because waste water, waste liquid amount are larger, and elution agent concentration contained therein is generally relatively low, therefore So that the target for recycling eluent is technically difficult to realize, and if not reclaiming eluent, operating cost will be increased again; 4) because waste water, waste liquid amount are larger, and pollutant concentration contained therein is generally relatively low, hence in so that the recycling of pollutant is reclaimed Using be technically difficult to realize;5) technical process causes water resources consumption excessive, is difficult to bear for arid area.
High concentration that the present embodiment is provided, complete circulation type soil, in solid waste pollutant chemical leaching separation side Method, intends by significantly cutting down technique waste water yield, the problem of making above-mentioned associated while be resolved, and make soil renewal or The financial cost of Solid Waste Treatment is significantly cut down.
The chemical leaching separation method that the present embodiment is provided, comprises the following steps:
Chemical leaching:Pending soil, solid waste are put into leacheate and carried out after chemical leaching, then carry out it is solid, Liquid is separated, soil, solid waste after must elute, wherein, the constant volume of leacheate contains eluent and pollution in leacheate The constant concentration of pollutant in thing, and leacheate, the constant density value of pollutant for N times soil, be mingled with molten in solid waste The pollutant control aimed concn of liquid;
Countercurrent rinsing:Soil, solid waste after above-mentioned elution are subjected to countercurrent rinsing, until being pressed from both sides in soil, solid waste The pollutant concentration of mixture solution is equal to management goal concentration, and the soil after countercurrent rinsing, solid waste are discharged, while will adverse current Eluate after rinsing is input in the leacheate of chemical leaching step, wherein, the rinse efficiency of countercurrent rinsing is N, the N= It is mingled with before countercurrent rinsing in soil, solid waste after pollutant concentration/countercurrent rinsing of solution and is mingled with molten in soil, solid waste The pollutant concentration of liquid, and N >=2, it should be pointed out that the rinse-system of any one setting, in stable operation, it is rinsed Efficiency N is a fixed parameter value;
Regeneration cycle:When the concentration of pollutant in leacheate is more than the constant density of setting, leacheate part is exported Pollutant extraction is carried out, the leacheate extracted after pollutant is returned in the leacheate of chemical leaching step or by countercurrent rinsing Eluate afterwards is carried out after pollutant extraction, and the eluate extracted after pollutant is returned to the leacheate of chemical leaching step In, until pollutant concentration is equal to the constant density of setting in leacheate;When the volume of leacheate is more than the constant volume of setting When, the output of leacheate part is subjected to counter-infiltration, penetrating fluid and concentrated solution is obtained or the eluate after countercurrent rinsing is subjected to reverse osmosis Thoroughly, penetrating fluid and concentrated solution are obtained, and concentrated solution is returned in the leacheate of chemical leaching step, until leacheate volume is equal to The constant volume of setting, wherein, pollutant concentration is more than or equal to the constant density value set in chemical leaching step in concentrated solution.
Wherein, the constant density value set described in regeneration cycle step and pollutant in leacheate in chemical leaching step Constant concentration value it is identical;The homoeostat product value set described in regeneration cycle step and the body of leacheate in chemical leaching step Product steady state value is identical.
, can be with when being mingled with pending soil, solid waste without stone to be processed, gravel or during unclassified stores Increase sorting step before chemical leaching step, the stone, gravel or unclassified stores that need not handle are removed, to reduce The operating load of each processing step in rear end.
Wherein, when pollutant is organic matter, eluent is the organic solution that can dissolve the organic matter;When pollutant is difficult When being dissolved in the heavy metal compound of water, eluent is chelating agent, acid or alkali;When pollutant is heavy metal compound soluble in water When, eluent is water.Wherein, it is insoluble in water to refer under the conditions of 20 DEG C, meltage is less than 0.1g in 100g water, soluble in water to be Refer under the conditions of 20 DEG C, meltage is more than 10g in 100g water.For example:When pollutant is the organic matters such as DDT, BHC, Eluent can select the organic solvent that n-hexane etc. can dissolve above-mentioned organic matter;When pollutant is chrome green, lead oxide etc. When being insoluble in the heavy metal compound of water, eluent can select the chelating agents such as EDETATE SODIUM, oxalic acid or sulfuric acid, sodium hydroxide etc. Acid, alkali;When pollutant is the heavy metal compound soluble in water such as copper sulphate, eluent can select water.
The process chart of chemical leaching separation method provided referring to Fig. 1 for the present invention, wherein, 1. chemical leaching step (correspond to high concentration chemical elution circuit), high concentration chemistry elution circuit receive by handled the need for outside send soil, Leacheate in the material such as solid waste (stream S), high concentration chemistry elution circuit contains eluent and pollutant, and so-called The levels that high concentration is primarily referred to as pollutant are higher, are N times of soil, are mingled with the pollutant control of solution in solid waste Aimed concn, the high concentration leacheate derives from fresh leacheate stream C and the multiplexing leacheate in other steps, makes The materials such as soil to be processed, solid waste and leacheate is needed to interact, it would be desirable to soil, solid waste of processing etc. Pollutant in material is as solute dissolving with leacheate, the material after chemical leaching then is carried out into solid and liquid separation Afterwards, the material after partially liq will be removed to remove and be delivered in countercurrent rinsing system in the form of stream A;2. countercurrent rinsing step (corresponding to countercurrent rinsing system), countercurrent rinsing system receives the stream A of the chemical elution circuit output of high concentration, by outside input Rinsing liquid liquid stream U, the two is interacted, then by after rinsing material carry out solid and liquid separation after, will remove Material after partially liq is removed in the form of stream G (for technological process product), and the eluate that rinsing is produced is moved out of to be formed Eluate liquid stream H, the flow portion or is all fed directly to using in the form of liquid stream E in the chemical elution circuit of high concentration as being multiplexed Leacheate, remainder is liquid stream J, is delivered in regeneration cycle system;3. regeneration cycle step (correspond to regeneration cycle system), The startup of the regeneration cycle system, mainly pollutes according in the volume and leacheate of leacheate in the chemical elution circuit of high concentration The concentration of thing is determined, when pollutant concentration exceedes the perseverance of constant density or leacheate volume more than setting of setting in leacheate When determining volume, high concentration chemistry elution circuit will export leacheate liquid stream B or countercurrent rinsing system output eluate liquid stream J, lead to Cross the processing that regeneration cycle system carries out chemically or physically to above-mentioned stream containing pollutant make its pollutant concentration reduce or The volume of stream is reduced, regeneration leacheate, regeneration rinse liquid, the pollutant being separated with solution is formed, regeneration leacheate is with liquid Stream D form is delivered in the chemical elution circuit of high concentration as leacheate reuse, and regeneration rinse liquid is removed in the form of liquid stream R Countercurrent rinsing system is completely or partially delivered to after regeneration cycle system as rinsing liquid reuse, the pollutant being separated with solution It is moved to outside system and forms contaminated material stream P.
Wherein, referring to Fig. 1, high concentration chemistry elution circuit (chemical leaching step):In certain steady production period T It is interior, there is quality to be M into the stream S of the chemical elution circuit of high concentrationSPollutant X by chemical leaching and eluent it is anti- Should, it is dissolved in as solute in leacheate, the solid phase that is formed for lessivation, liquid phase mixture, it is desirable to control the system Pollutant X mass concentration C in interior liquid phaseXMaintain in a higher scope, specific requirement is:CX=N*C0, in preceding formula:N For the rinse efficiency of rinse-system, N=CA/CG, and require N >=2, wherein CAPollutant X in the solution carried under one's arms by stream A Concentration, CGPollutant X Rong Du, C in the solution carried under one's arms by stream G0To be mingled with the dirt of solution in the soil of setting, solid waste Contaminate thing management goal concentration, it should be pointed out that the rinse-system of any one setting, in stable operation, its rinse efficiency N It is a fixed parameter value.
To keep leacheate volume VTConstant, specific control mode is as follows:
It is highly concentrated by entering into and out in the process control unit interval in the period T of certain steady production The solution body accumulated amount for spending chemical leaching system is equal so that total solution amount volume stability is in some fixed value V in the systemT。 Solution body accumulated amount into system includes:The solution body accumulated amount V carried under one's arms in stream SS, by regeneration cycle system convey Lai regeneration Leacheate liquid stream D volume VD, by countercurrent rinsing system convey Lai eluate liquid stream E volume VE;Removal system it is molten Liquid accumulated amount includes:The eluate liquid stream B of chemical leaching system output volume VB, chemical leaching system output stream A The volume V of middle carried under one's arms solutionA, technological process by control cause:VS+VD+VE=VB+VA, then now high concentration chemistry drenches It is a certain constant fixed value V to wash solution body accumulated amount in systemT, wherein, VTMaintenance it is stable be opening using counter-infiltration system What the size of dynamic, penetrating fluid yield was kept.
Concentration C to keep pollutant in leacheateXConstant, specific control mode is as follows:
Leacheate volume is a certain stationary value V in the chemical elution circuit of high concentrationTUnder conditions of, pass through technological process control The pollutant X amounts entered in unit interval processed in the chemical elution circuit liquid phase of into and out high concentration are equal, you can.Work as the unit interval When interior inlet is more than discharge, pollutant X is constantly enriched with leacheate, CXValue increases;When inlet is small in the unit interval When discharge, total amounts of the pollutant X in leacheate is constantly reduced, CXValue reduction;When inlet is equal to stream in the unit interval During output, the concentration Cs of pollutant X in the solutionXValue keeps stable.Pollutant X mass Ms in into system in solutionINIncluding: The pollutant X amounts of being eluted M in stream SS, the pollutant X mass for regenerating leacheate liquid stream D conveyed by regeneration cycle system MD, by countercurrent rinsing system convey Lai eluate liquid stream E pollutant X mass MsE, i.e. MIN=MS+MD+ME;Removal system Pollutant X mass Ms in solutionOUTIncluding:Pollutant X mass Ms in the eluate liquid stream B of chemical leaching system outputB, change The pollutant X mass Ms in solution are carried under one's arms in the stream A for learning elution circuit outputA, i.e. MOUT=MB+MA.System is in stable operation Phase, because now leacheate volume is a certain stationary value V in chemical leaching systemT, during by process control unit In the pollutant X amounts entered in the chemical elution circuit solution of into and out high concentration it is equal, i.e., by controlling MIN=MOUTSo that The concentration C of pollutant X in high concentration chemistry elution circuit in solutionXValue stabilization is in N*C0.Work as CXValue appearance is fluctuated and more than N* C0When, by increasing the clearance δ of liquid stream B, liquid stream J volume flow or increase regeneration cycle system to pollutant so that single There are more pollutant X to be reproduced circulatory system removal in the time of position, correspondingly cause MIN< MOUT, high concentration chemical leaching system C in systemXValue is reduced to N*C0;In CXValue constantly reduces and occurs or be likely to occur less than N*C0In the case of, reduce liquid stream B, liquid Flow J volume flow or reduce clearance δ of the regeneration cycle system to pollutant so that have less pollutant in the unit interval X is reproduced circulatory system removal, correspondingly causes MIN> MOUT, C in the chemical elution circuit of high concentrationXValue increases to N*C0
In stable operation stage, because the pollutant X mass removed in unit interval T via regeneration cycle system is definite value MDEL(MDEL=MS-MG, M in formulaGPolluted in the solution carried under one's arms by the stream G that technological process final product is rinse-system output Thing X mass), therefore by setting pollutant concentration C in the chemical elution circuit of stable operation stage high concentrationXFor the N* of higher concentration C0, eluate volume flow to be processed is needed to reduce regeneration cycle system.When regeneration cycle system only receives to come from high concentration During the leacheate liquid stream B of chemical leaching system, leacheate liquid stream B volume V in control unit interval TB=MS/(N*C0*δ);When Regeneration cycle system receives the leacheate liquid stream B from the chemical elution circuit of high concentration, washing from countercurrent rinsing system simultaneously When going out liquid liquid stream J, liquid stream B, liquid stream J volume in unit interval T are controlled as the following formula:VB*C0B+VJ*CJJ=MS, (in formula δB、δJRespectively regeneration cycle system is to the pollutant X clearances in liquid stream B, liquid stream J, CJFor the pollutant X mass in liquid stream J Concentration).
For countercurrent rinsing step, multi-stage batch formula countercurrent rinsing is can select, specially in countercurrent rinsing step successively It is provided with soil, solid waste after multiple potchers, elution to be transported in batches in first potcher, by first potcher In rinsing liquid rinsed after, the soil after rinsing, solid waste are transferred in second potcher, by second rinsing Rinsing liquid in groove is rinsed, by that analogy, until the rinsing liquid drift that soil, solid waste pass through in last potcher Removed after washing, wherein, will when pollutant concentration reaches pollutant control aimed concn in rinsing liquid in last potcher Rinsing liquid in first potcher is discharged as eluate, and the rinsing liquid in second potcher is moved on into first rinsing As rinsing liquid in groove, by that analogy, make until the rinsing liquid in last potcher is moved on in a potcher thereon After rinsing liquid, fresh rinsing liquid is filled into last potcher, wherein, the soil, solid waste in every batch are defeated The amount of sending is equal.
However, soil after being rinsed using above-mentioned countercurrent rinsing step, being mingled with containing for pollutant in solution in solid waste Situation about always constantly fluctuating from low to high is measured, the problem of wash effect is unstable is caused.
Referring to Fig. 1, countercurrent rinsing system (countercurrent rinsing step):In the chemical leaching method that the present embodiment is provided preferably A kind of countercurrent rinsing mode, it is desirable to eluate stream H its pollutant X concentration Cs produced by countercurrent rinsing systemHIt is more than or equal to The stream G of system output carries under one's arms the pollutant concentration C in liquidG, i.e. CH≥CG;System receive rinsing liquid liquid stream U include by Fresh rinse solution liquid stream F, the regeneration rinse liquid liquid stream R of regeneration cycle system output of technological process outside input, certain In steady production period T, if because chemical reaction or physics steam in high concentration chemistry elution circuit and regeneration cycle system Liquor capacity loss amount V caused by hairLOSSMore than the solution body accumulated amount V carried under one's arms in stream SSAnd intend passing through countercurrent rinsing system institute The eluate of generation compensation volume into the chemical elution circuit of high concentration, regeneration cycle system is VCOMPSolution [VCOMP≤ ﹙ VLOSS-VS﹚] when, Fresh rinse solution liquid stream its volume of fluid of F V by technological process outside input should be controlledFIt is defeated equal to system The volume of fluid V that the stream G gone out is carried under one's armsGWith VCOMPSum, i.e. VF=VG+VCOMP;In the case of other in addition to aforementioned circumstances, V should be controlledF≤VG;The purpose of above-mentioned technique and parameter selection is:Ensure the chemical elution circuit of high concentration, in regeneration cycle system Overall solution volume amount will not be due to the V of technological process outside inputFVolume is excessive and ever-increasing unstable phenomenon occurs.
Countercurrent rinsing step is preferably provided with a plurality of countercurrent rinsing branch road, every countercurrent rinsing branch road in the embodiment above In be provided with countercurrent rinsing unit, and soil, solid waste sequentially input different countercurrent rinsing branch roads in batches after elution On, interim rinsing is carried out repeatedly via the countercurrent rinsing unit on countercurrent rinsing branch road respectively, until in soil, solid waste It is mingled with the pollutant concentration of solution identical equal to rinsing liquid volume each in management goal concentration, and countercurrent rinsing unit;Its In, the eluate after being rinsed for the first time in rinse unit on every countercurrent rinsing branch road is input to the elution of chemical leaching step In liquid, and the eluate on the M articles countercurrent rinsing branch road in rinse unit after the W times rinsing is input to the M+1 articles adverse current drift The rinsing liquid in rinse unit as the W-1 times rinsing of the rinse unit on branch road is washed, and M is the natural number more than or equal to 1, W For the natural number more than or equal to 2, wherein, the number of countercurrent rinsing branch road is with each rinse unit to a collection of soil, solid waste Rinsing to reach management goal requirement rinsing times it is equal.
Specifically, referring to Fig. 1, material A to be rinsed in batches, successively respectively enters countercurrent rinsing system, the adverse current The Q countercurrent rinsing branch road (Q is the natural number more than or equal to 2) that rinse-system is included, the quality per batches A is equal, warp Removed after crossing rinsing by system, the product as technological process.Each batches, the elder generation of processing is completed by it by technological process Order, is named as A successively afterwards1、A2、A3……AX... (X is positive integer), each rinsing is sequentially inputted in order per batch materials On branch road, for any batch material AX, successively implementing Q times in rinse-system, (Q is more than or equal to 2 for any of setting Natural number) rinse cycle, referred to as Q stage countercurrents rinse-system rinses the number of branch road and every wherein in countercurrent rinsing system Rinse unit is equal to the rinsing times of a batch materials on countercurrent rinsing branch road, material AXAny a times (a is positive integer, 1 < a≤Q) rinse cycle is:Rinsing liquid used in the process and material to be rinsed are mixed to form mixture, in mixed process In, the polluter X in material to be rinsed is equal in the form of dissolved matter by effects such as dissolving, diffusion, dilution or chemical reactions It is dispersed into evenly in the liquid contained by mixture, the eluate containing polluter X is isolated in mixture, separation is washed out Residue after liquid is material AXThe a times rinse cycle washes rear thing.As a < Q, a times rinse cycle washes rear thing conduct Material to be rinsed enters material AXThe a+1 times rinse cycle;As a=Q, material AXAfter washing produced by the Q times rinse cycle Thing is the final product of countercurrent rinsing system and whole technological process, removes system;Material AXAt a times, (a is positive integer, and 1 ≤ a < Q) rinsing liquid used in rinse cycle be material AX-1Eluate produced by the a+1 times rinse cycle;Material AXIt is the rinsing liquid liquid stream F inputted by countercurrent rinsing its exterior in rinsing liquid used in the Q times rinse cycle;Material AX Eluate produced by 1st rinse cycle, is moved out of system formation eluate liquid stream H;Material AXThe Q times rinse cycle Produced rear thing of washing is moved out of after system, material AX+QInto material AXThe 1st cleaning is carried out in rinse unit where original.
Countercurrent rinsing system used in above-mentioned countercurrent rinsing step preferred scheme can be named as the differential step dystopy change of current rinsings of Q System, using the rinse-system of above-mentioned preferred scheme, in carried under one's arms solution the material stream A containing pollutant X it is rinsed Journey, if according to rinse cycle of the following state modulator to material stream A:1. the difference that material stream A to be rinsed is divided equally with equivalent Batch successively enters system;2. pollutant X is free of in the rinsing liquid liquid stream U of outside input;3. at each time of each batches The rinsing liquid volumetric usage of its in rinse cycle is VGK times, and each rinse cycle isolates the wash-off of same volume amount Liquid, makes to wash rear thing solution content (i.e. V identical with material stream AG=VA).According to above state modulator to the rinsed of material stream A Journey, in the steady production stage, its wash effect is as follows:
1. with CAWith CGThe ratio N size of value represent the wash effects of Q stage countercurrent rinse-systems, i.e. NQ=CA/CG;When During Q=2 (i.e. system is 2 stage countercurrent rinse-systems), N2=(K+1)2-K;When Q=3 (i.e. system is 3 stage countercurrent rinse-systems) When, N3=(K+1) * N2-K*(K+1);As Q > 3, NQ=(K+1) * NQ-1-K*NQ-2.(in formula:CACarried under one's arms by material stream A molten Pollutant X concentration, C in liquidGPollutant X concentration in solution is carried under one's arms by countercurrent rinsing system output stream G, Q is default Rinsing times);
②MA=MG+MH(in formula:MAPollutant X mass, M in solution are carried under one's arms by material stream AGIt is defeated for countercurrent rinsing system Reactor effluent stream G carries under one's arms pollutant X mass, M in solutionHPollutant X matter in the eluate liquid stream H exported for countercurrent rinsing system Amount);
③CG=CA/NQ, CH=CA*(NQ-1)/(K*NQ), VH=VU=K*VG=K*VA(in formula:VUFor input countercurrent rinsing The rinsing liquid liquid stream U volumes of system;VHThe eluate liquid stream H volumes exported for countercurrent rinsing system);
By the design of above-mentioned countercurrent rinsing preferred steps, the need processing eluate generated in each countercurrent rinsing step is only Be rinsed the eluate produced by material is rinsed for the first time for each batch, and second so that the eluate after rinsing for the Q time all Can repeatedly utilize, can greatly reduce the wash-off liquid measure of generation, reduce the sewage quantity that need to be handled, reduction waste water control into Point, simultaneously because each batch of design of the preferred scheme is rinsed material rinses produced eluate by multiple for the first time Just discharged after use, therefore pollutant concentration is higher in the eluate of its discharge, if handled again by reverse osmosis unit, meeting The concentrated solution containing higher concentration pollutant is obtained, pollutant extraction element is now sent to again and is handled, because pollutant is dense Degree is higher, and can greatly reduce needs solution body accumulated amount to be processed and can reduce the difficulty and processing cost of processing, preferably solves Problems of the prior art.
To reduce the rinsing times that rinse unit is carried out on every countercurrent rinsing branch road, as the improvement of scheme, each drift Unit is washed after generally stirring rinse step is carried out, then carries out solid-liquid separation step, rinse unit is remarkably improved and floats every time The efficiency washed, and then realization reaches the technical of management goal, reduces the rinsing times for needing to carry out, reduces cost consumption.
For using water wisely, as the improvement of technical scheme in regeneration cycle step, penetrating fluid is input to adverse current and floated Wash in step as rinsing liquid.
Above-mentioned countercurrent rinsing step, although multi-stage batch formula countercurrent rinsing can be used, it is preferred that using above-mentioned excellent The high performance counter current rinse method of choosing, main reason is that, between above-mentioned preferred rinse method and multi-stage batch formula countercurrent rinsing There are two significantly intuitively to distinguish:
1) preferred rinse method is divided into multiple rinsing branch roads, and each branch road sets a rinse unit, any rinsing list Member is capable of the rinsing of a certain batches of complete independently, and pollutant concentration reaches the requirement of management goal value after rinsing, and many Although level batch (-type) countercurrent rinsing is also classified into multiple units, but any batches all have to pass through several units of series connection Rear make it that pollutant concentration reaches desired value after rinsing, i.e., only one unit be soil after the final rinsing of external output, Solid waste.
2) preferred rinse method is during stable operation, and its concentration for being mingled with solution of each batch materials of its output is steady Fixed, and multi-stage batch formula countercurrent rinsing, its every batches its concentration for being mingled with solution exported is to fluctuate, i.e., concentration is not Disconnected to rise, until reaching after the upper limit, it is clear water to change final rinse liquid, and then concentration is minimized suddenly, and concentration is again continuous thereafter Rise, until next time changes final rinse liquid.
Referring to Fig. 1, regeneration cycle system has following features:
1. the system receives stream B, stream J, and the reduction of its pollutant concentration is made to its processing carried out chemically or physically, and Output regeneration leacheate liquid stream D, regeneration rinse liquid liquid stream R, the pollutant stream P being separated with solution to outside system;2. one In fixed steady production period T, the liquid stream (or stream) for entering system by control is measured, pollutant X clearance so that from Pollutant X mass M in the pollutant stream P separated in the system in solutionDELFor MSWith MGDifference, i.e. MDEL=MS- MG(M in formulaGPollutant X mass in the solution carried under one's arms by the stream G that technological process final product is rinse-system output);③ In certain steady production period T, the regeneration rinse liquid liquid stream R volumes V that system is exported is caused by controlRMeet with It is lower to require, i.e. VR=VS+VH-VA-VLOSS-VP
High concentration that the present embodiment is provided, complete circulation type soil, in solid waste pollutant chemical leaching separation side Method, with following beneficial effect:
1st, the pollutant quality removed is needed to be fixed value within the steady production stage, unit interval, due to work of the present invention Pollutant concentration is higher in the eluate produced in skill flow so that the eluate of pollutant need to be removed via regeneration cycle system Flow is greatly decreased, and higher pollutant concentration is generally also beneficial to improve the removal efficiency of pollutant.
2nd, the eluate grade that reverse-flow rinsing process system of the present invention is produced is high, volume is few, and fully enters regeneration and follow Loop system, it is to avoid the discharge of low concentration poaching wastewater causes the phenomenon of secondary pollution, environmental benefit is good.
3rd, due to the not external waste discharge of present invention process flow, the corresponding eluent number of dropouts caused in solution is down to most It is low, it can effectively reduce operating cost.
Referring to Fig. 2, what the present embodiment was provided is dirty suitable for above-mentioned high concentration, complete circulation type soil, solid waste The piece-rate system of the chemical leaching separation method of thing is contaminated, the system is main by conveying device 2, equipment for separating liquid from solid 3, countercurrent rinsing Device 4, reverse osmosis unit 5, pollutant extraction element 6 and constituted for the chemical leaching device 1 for holding leacheate;Wherein, Be separately provided in chemical leaching device 1 detect leacheate in pollutant concentration concentration detector 11 and for detect drench The volume detector 12 of washing lotion volume, the solid output end of chemical leaching device 1 is connected with the input of conveying device 2, conveying The output end of device 2 is connected with the input of equipment for separating liquid from solid 3, the solid output end of equipment for separating liquid from solid 3 by pipeline 7 with The solid input connection of countercurrent rinsing device 4, and valve 71, the fluid output port of equipment for separating liquid from solid 3 are provided with pipeline 7 Be connected with the fluid input port of chemical leaching device 1, the fluid input port of countercurrent rinsing device 4 respectively with fresh water source and anti- The penetrating fluid output end connection of permeability apparatus 5, the liquid of the fluid output port and chemical leaching device 1 of countercurrent rinsing device 4 is defeated Enter end connection, the input of reverse osmosis unit 5 is connected with the fluid output port of chemical leaching device 1, reverse osmosis unit 5 it is dense molten Liquid output end is connected with the fluid input port of chemical leaching device 1, input and the chemical leaching device of pollutant extraction element 6 1 fluid output port connection, the fluid output port of pollutant extraction element 6 is connected with the fluid input port of chemical leaching device 1, The output end of concentration detector 11 is connected with the control end of pollutant extraction element 6, the output end and reverse osmosis of volume detector 12 The control end connection of saturating device 5.
The specific work process of above-mentioned piece-rate system is as follows:Pending soil or solid waste is input to chemical leaching dress Chemical leaching is carried out in putting 1, the eluent in the pollutant and leacheate in soil or solid waste is reacted, is dissolved in elution In liquid, partial contamination thing is deposited in leacheate, and partial contamination thing is present in solute and is mixed in soil or solid waste In solution, then the soil or solid waste after elution are transported in equipment for separating liquid from solid 3 by conveying device 2, will be eluted Soil or solid waste afterwards carries out separation of solid and liquid, to reduce the solution content being mingled with soil or solid waste, and then reduces Liquid after pollutant load in soil or solid waste, separation of solid and liquid is returned in chemical leaching device 1, and separation of solid and liquid Solid afterwards, which is transported in countercurrent rinsing device 4, carries out countercurrent rinsing, to remove the pollution remained in soil or solid waste Thing, until contained pollutant reaches management goal in doped solution in soil or solid waste, wherein, the rinsing after countercurrent rinsing Liquid can be returned to as multiplexing leacheate in chemical leaching device 1, and is respectively arranged with Concentration Testing in chemical leaching device 1 Device 11 and volume detector 12, when concentration detector 11 detects that the pollutant concentration in chemical leaching device 1 exceedes the perseverance of setting During definite value, start pollutant extraction element 6 and export the part leacheate in chemical leaching device 1, extracted and filled by pollutant 6 carry out pollution extractions are put, the leacheate extracted after pollutant are returned in chemical leaching device 1, to realize pollutant concentration Reduction, when the leacheate volume that volume detector 12 is detected in chemical leaching device 1 exceedes the steady state value of setting, start anti- Permeability apparatus 5 exports the part leacheate in chemical leaching device 1, carries out counter-infiltration, the concentrated solution that counter-infiltration is formed is returned Return in chemical leaching device 1, realize the reduction of leacheate volume in chemical leaching device 1, the penetrating fluid that counter-infiltration is formed is Clear water, is sent to countercurrent rinsing device 4 and is used as Fresh rinse solution.
Referring to Fig. 3, the structure design of preferred countercurrent rinsing device 4 in above-mentioned piece-rate system, the countercurrent rinsing device 4 by Multiple countercurrent rinsing branch roads 41 being arranged in parallel successively are constituted, and each countercurrent rinsing branch road 41 is respectively arranged with rinsing device 411 and the temporary storage tank 412 of eluate;Wherein, the solid input of rinsing device 411 passes through pipeline 7 and equipment for separating liquid from solid 3 Solid output end is connected, and is provided with valve 71 on the pipeline 7, the fluid input port of rinsing device 411 respectively with fresh water The penetrating fluid output end connection of source and reverse osmosis unit 5, fluid output port and the temporary storage tank 412 of eluate of rinsing device 411 Input connection;The output end of the temporary storage tank 412 of eluate respectively with the fluid input port of chemical leaching device 1 and next inverse The fluid input port connection of rinsing device 411 in stream rinsing branch road 41.
Wherein, rinsing device 411 can select filter-pressing device, can be mechanism filter-pressing or air press filtration.
Referring to Fig. 3, rinsing device 411 can also select following structure design, wherein, rinsing device 411 is main by housing 4111st, rotating cabin 4112, the first motor 4113, the motor 4115 of puddler 4114 and second are constituted, wherein, on rotating cabin 4112 Through hole is arranged at intervals with, the rotation of rotating cabin 4112 is installed on inside housing 4111, the output end and puddler of the first motor 4113 4114 upper end drive connection, the lower end of puddler 4114 is inserted in the inside of rotating cabin 4112, the driving of the second motor 4115 End and the drive connection of rotating cabin 4112.
The course of work of countercurrent rinsing device 4 is:Equipment for separating liquid from solid 3 by the soil or solid waste of output in batches according to It is secondary to enter in different countercurrent rinsing branch roads 41, initially entered into the soil or solid waste in each bar countercurrent rinsing branch road 41 Rinsed to rinsing device 411, when rinsing device 411 is from filter-pressing device, soil or solid waste are put into filter-pressing device It is interior, it is passed through rinsing liquid and is once rinsed, after rinsing terminates, eluate is press-filtered out by filter-pressing device, and completion is once rinsed, so Rinsing liquid is passed through for the second time into filter-pressing device again afterwards and carries out secondary rinsing, and after rinsing terminates, eluate is by filter-pressing device press filtration Out, secondary rinsing is completed, up to soil or solid waste are mingled with the pollutant concentration of solution and reach improvement mesh in filter-pressing device Mark is required, the soil or solid waste after rinsing are input in finished product apparatus for placing, and is input to washes from filter-pressing device every time Go out in the filter-pressing device that the eluate in the temporary storage tank 412 of liquid can be input in next countercurrent rinsing branch road 41 according to setting as multiple With rinsing liquid or return in chemical leaching device 1 as multiplexing leacheate;When rinsing device 411 is the structure shown in Fig. 3, It is first into the soil or solid waste in each bar countercurrent rinsing branch road 41 in the rotating cabin 4112 of rinsing device 411, And be passed through in rotating cabin after rinsing liquid, start the first motor 4113 driving puddler 4114 and once stirred rinsing, rinse After stirring rinsing terminates, start the second motor 4413 driving rotating cabin 4112 and rotated relative to housing 4111, carry out solid-liquid point From, complete a rinse cycle, required according to administering, repeatedly can be passed through into rotating cabin the rinsing liquid above-mentioned stirring rinsing of progress with And separation of solid and liquid process, until soil or solid waste are mingled with the pollutant concentration of solution and reach that management goal will in rotating cabin Ask, the soil or solid waste after rinsing are input in finished product apparatus for placing, and the housing 4111 every time from rinsing device is defeated Enter in the filter-pressing device that can be input to the eluate in the temporary storage tank 412 of eluate according to setting in next countercurrent rinsing branch road 41 Multiplexing leacheate is used as being multiplexed rinsing liquid or returning in chemical leaching device 1.
Wherein, the output end of the temporary storage tank 412 of eluate is also extracted with the input and pollutant of reverse osmosis unit 5 and filled respectively The input for putting 6 is connected, and by the structure design, the eluate in the temporary storage tank 412 of eluate not only being returned directly to Learn in elution device 1, but also open can be handled by reverse osmosis unit 5 and pollutant extraction element 6 after return again to leacheate In, it is used as multiplexing leacheate.
The concentrated solution output end of reverse osmosis unit 5 can also be connected with the input of pollutant extraction element 6, i.e., by anti- Concentrated solution after the processing of permeability apparatus 5 carries out the extraction of pollutant by pollutant extract extraction element 6 again.
Because the process object of pollutant is different, pollutant extraction element 6 can select no device respectively, for example: When pollutant is heavy metal element, electrodialysis plant is can select as pollutant extraction element, and when pollutant is organic matter When, extraction equipment is can select as the extraction element of pollutant.Referring to Fig. 2, pollutant extraction element shown in this Fig is the moon Ion diaphragm electrolysis unit (note:Anion membrane electrolysis unit is one kind of electrodialysis plant), i.e., set in the middle part of electrolytic cell Anion membrane is equipped with, electrolytic cell is divided into cathode pool and anode pool, after leacheate is input in the electrodialysis plant, is carried out Electrolysis, wherein heavy metal ion can be restored in negative electrode, the chelator anion in cathode chamber due to by anion every The barrier of film is oxidized without entering anode chamber, decomposes destruction, and chelator anion can be together with the aqueous solution together returning to Learn and be multiplexed in elution device 1, to avoid the loss of chelating agent.
Explanation is further explained in detail to present invention progress with a specific case study on implementation below.
Embodiment 1
The same high concentration by taking the soil remediation in background technology by heavy metal lead pollution as an example, provided using the present invention, The chemical leaching separation method and piece-rate system of complete circulation type soil pollutant carry out the improvement of lead contamination.Wherein, the soil Before processing, its total lead content is 1000mg/kg (in terms of dry soil quality, similarly hereinafter), and soil moisture content (contains for 21% for butt The mass ratio of water rate, i.e. water and arid soil, similarly hereinafter), the saturated aqueous rate of the soil is 52%, and saturated aqueous soil is using warp After the feasible dewatering means of Ji, its moisture content can drop to 30%;Management goal is:By soil treatment amount 10t/h's (butt) Speed continuous and steady operation, makes total lead content in the soil after processing be less than 150mg/kg.
Following parameter is set to rinse-system:1. 7 differential step dystopy change of current rinse-systems (Q=7) are used;2. chemical leaching The material stream A moisture content to be rinsed of device output is 30%, and the different batches divided equally with equivalent successively enter system;3. each Its rinsing liquid volumetric usage is V in each rinse cycle of batchesGK times (K values 1.5), and each rinse cycle, The eluate of same volume amount is isolated, it is identical with material stream A to make to wash solution content in rear thing, is 30%;4. by system The rinsing liquid liquid stream U volumes of outside input are 4.5m3/ h, wherein without pollutant X.According to above state modulator to material stream A rinse cycle, in the steady production stage, its wash effect is as follows:N7=CA/CG=49.25781, (in formula:CAFor material stream A carries under one's arms pollutant X concentration, C in solutionGPollutant X concentration in solution is carried under one's arms by countercurrent rinsing system output stream G).
Following parameter is set to chemical leaching device (high concentration chemistry elution circuit) stable operation stage:1. System Solution The high concentration desired value C of middle lead0For 8000mg/L, chemical leaching uses the sodium solutions of EDTA- bis- of 0.1mol/L concentration;2. it is native Earth in the chemical elution circuit of high concentration through chemical leaching, be dehydrated to moisture content 30%, exported to adverse current and floated in the form of stream A Wash process system;3. soil has the enough reaction time in system, and is sufficiently stirred, it is ensured that enter solution in soil Total lead eluting rate reach 90%.
Make following setting to regeneration cycle system:1. system uses anion membrane electrolysis to by high concentration chemical leaching The leaded eluate liquid stream B of system output is administered, and eluate enters behind anion membrane electric tank cathode room, lead and EDTA The chelate of molecule formation is destroyed, and metallic lead separates out in negative electrode and is moved out of system formation pollutant stream P, EDTA molecule quilt Anion membrane barrier is without entering anode chamber, being destroyed, and the sodium solutions of EDTA- bis- regenerated after removing lead are by cathode chamber stream Go out, removal system is utilized as regeneration leacheate.Suitable selection electrode parameter, voltage parameter so that the removal of lead in solution Rate reaches 75%;2. system uses hyperfiltration to being handled by eluate liquid stream, the not leaded and chemical leaching after processing The clear water of agent, removal system forms regeneration rinse liquid liquid stream R, is multiplexed as rinsing liquid in rinse-system, and concentrated solution removes system; 3. the regeneration leacheate of anion membrane electric tank cathode room output, the concentrated solution output system in the lump of reverse osmosis unit output, Regeneration leacheate liquid stream D is formed, is multiplexed as leacheate in the chemical elution circuit of high concentration.
In the steady production stage of 1h durations, the soil dry matrix amount of the chemical elution circuit of input high concentration is 10t, input The volume that water is carried under one's arms in soil is 2.1m3(before processing moisture content 21%), after being contacted with leacheate, the lead eluting rate in soil 90%, it is eluted the lead mass M into leacheateSFor 9kg;Due to the solution lead concentration value of the chemical elution circuit setting of high concentration For 8000mg/L, therefore lead concentration C in the solution that it is carried under one's arms by the stream A of the chemical elution circuit output of high concentrationAIt is worth for 8000mg/ L, solution body accumulated amount is VA=3m3Lead mass M in (moisture content 30%), solutionAIt is worth for 24kg;Using 7 differential step dystopy change of current drifts Wash system to rinse stream A, due to CA/CG=49.25781, therefore lead in rear material stream G its solution for carrying under one's arms is washed in output Concentration CGValue is that 162.4108mg/L, solution body accumulated amount are VG=3m3, lead quality is 0.48723kg in solution, rinse-system is defeated Lead concentration C in the eluate liquid stream H gone outHValue is that 5225.059mg/L, solution body accumulated amount are VH=4.5m3, lead mass MHIt is worth and is 23.51277kg。
In the steady production stage of 1h durations:Input the liquid bulk of the chemical elution circuit of high concentration and liquid regeneration cycle system Accumulated amount includes:VS(to carry under one's arms the volume of water, V in input soilS=2.1m3)、VH(it is by washing that countercurrent rinsing system is exported Go out liquid liquid stream H volumes, VH=4.5m3);High concentration chemistry elution circuit and the volume of fluid bag of regeneration cycle system output Include:VA(for its solution body accumulated amount for carrying under one's arms of the stream A of the chemical elution circuit output of high concentration, VA=3.0m3)、VR(followed by regeneration The regeneration rinse liquid liquid stream R volumes of loop system reverse osmosis unit output).To ensure that the chemical elution circuit of high concentration and regeneration are followed Liquid volume constant in loop system, it is necessary to so that input and output volume of fluid is identical, i.e. VR=VS+VH-VA=3.6m3, it is real Existing object above:By VH(4.5m3) regeneration cycle system reverse osmosis unit is fully entered, and moved by the chemical elution circuit of high concentration Go out 2.7m3Eluate input to the reverse osmosis unit of regeneration cycle system, 7.2m is amounted to above3Solution through reverse osmosis unit at Reason, it is 50% to control its producing water ratio, forms volume 3.6m3Regeneration rinse liquid liquid stream VROutput forms volume to rinse-system Measure 3.6m3Concentrated solution be back to the chemical elution circuit of high concentration.
In the steady production stage of 1h durations:Input in the chemical elution circuit of high concentration and regeneration cycle system in solution Lead quality includes:MS(for the lead quality being eluted in input soil, MS=9kg), MH(for the eluate exported by rinse-system Lead quality in liquid stream H, MH=23.51277kg);In high concentration chemistry elution circuit and the solution of regeneration cycle system output Lead quality include:MA(for the lead quality in the stream A of the chemical elution circuit output of high concentration its solution for carrying under one's arms, MA= 24kg)、MP(metallic lead separates out in electric tank cathode and is moved out of the quality of system).To ensure in the chemical elution circuit of high concentration Lead maintains high concentration desired value C in solution0(8000mg/L), it is necessary to so that high concentration chemistry elution circuit and regeneration cycle system The input of lead, output quantity are identical in solution, i.e. MP=MS+MH-MA=8.51277kg, to realize object above:By high concentration Learn elution circuit and remove 1.418795m3Eluate input to regeneration cycle system electrodialysis plant, control the clearance of its lead 75% is reached, is now separated out in electric tank cathode and is moved out of the metallic lead mass M of systemPFor 8.51277kg.
In the steady production stage of 1h durations:The rinsing liquid liquid stream U volumes for inputting countercurrent rinsing system are 4.5m3, its Include volume 3.6m3Regeneration rinse liquid liquid stream VR, by the Fresh rinse solution liquid stream F volumes of technological process external complement VFFor 0.9m3
In the steady production stage of 1h durations, the solution that it is carried under one's arms by the stream A of the chemical elution circuit output of high concentration EDTA molar concentration values CAE is 0.1mol/L, and solution body accumulated amount is VA=3m3(moisture content 30%), rinse-system enters to stream A After row rinsing, wash effect value N7=49.25781, therefore EDTA molar concentrations in rear material stream G its solution for carrying under one's arms are washed in output Value CGE is that 0.00203mol/L, solution body accumulated amount are VG=3m3, EDTA moles are 6.090405mol in solution.To remain high The concentration value of elution medicament in concentration chemical leaching system, from technological process outside input mole into the system and be 6.090405mol EDTA- disodiums (i.e. stream C), its reduced mass is 2.267092kg.
In the steady production stage of 1h durations, what rinse-system was exported washes rear material stream G (i.e. technological process final product) Butt quality is 10t, carries under one's arms amount of solution for 3m3(moisture content 30%).Because the chemical elution circuit of high concentration is to lead in soil Elution efficiency is 90%, therefore the lead (quality 1kg) containing 100mg/kg in stream G its solid phase;Lead in its solution for carrying under one's arms of stream G Concentration CGIt is worth for 162.4108mg/L, therefore lead quality is 0.48723kg in the liquid phases carried under one's arms of stream G.The lead that stream G is carried under one's arms Gross mass is 1.48723kg, and the lead content in conversion butt soil is 148.723mg/kg, is less than 150mg/kg improvement Target.
To sum up, in the steady production stage of 1h durations:The material that technological process is consumed only includes 0.9m3Fresh rinsing The EDTA- disodiums of liquid, 2.267092kg;Wash-off liquid measure handled by regeneration cycle system electrodialysis plant is only 1.418795m3, reverse osmosis unit processing solution amount is 7.2m3;Technological process processing amount of soil 10t (butt), lead clearance reaches To 85.13%, it is 1.48723kg to reclaim metallic lead quality, and realizes wastewater zero discharge, it is to avoid the possibility of secondary pollution.
Those skilled in the art will readily occur to its of the present invention after considering specification and putting into practice invention disclosed herein Its embodiment.The application be intended to the present invention any modification, purposes or adaptations, these modifications, purposes or Person's adaptations follow the general principle of the present invention and including undocumented common knowledge in the art of the invention Or conventional techniques.Description and embodiments be considered only as it is exemplary, true scope and spirit of the invention by right will Ask and point out.
It should be appreciated that the invention is not limited in the precision architecture for being described above and being shown in the drawings, and And various modifications and changes can be being carried out without departing from the scope.The scope of the present invention is only limited by appended claim.

Claims (10)

1. the chemical leaching separation method of pollutant in a kind of high concentration, complete circulation type soil, solid waste, it is characterised in that Comprise the following steps:
Chemical leaching:Pending soil, solid waste are put into leacheate and carried out after chemical leaching, then carries out solid, liquid point From, soil, solid waste after must eluting, wherein, the constant volume of the leacheate, in the leacheate containing eluent and The constant concentration of pollutant in pollutant, and the leacheate, the constant density value of the pollutant for N times the soil, It is mingled with the pollutant control aimed concn of solution in solid waste;
Countercurrent rinsing:Soil, solid waste after above-mentioned elution are subjected to countercurrent rinsing, until being pressed from both sides in the soil, solid waste The pollutant concentration of mixture solution is equal to the management goal concentration, and the soil after countercurrent rinsing, solid waste are discharged, and simultaneously will Eluate after countercurrent rinsing is input in the leacheate of chemical leaching step, wherein, the rinse efficiency of the countercurrent rinsing is It is mingled with soil, solid after pollutant concentration/countercurrent rinsing of solution before N, the N=countercurrent rinsings in soil, solid waste to give up It is mingled with the pollutant concentration of solution, and N >=2 in thing;
Regeneration cycle:When the concentration of pollutant in the leacheate is more than the constant density of setting, by the leacheate part Output carries out pollutant extraction, the leacheate extracted after pollutant is returned in the leacheate of chemical leaching step or by described in Eluate after countercurrent rinsing is carried out after pollutant extraction, and the eluate extracted after pollutant is returned into chemical leaching step In leacheate, until pollutant concentration is equal to the constant density of setting in the leacheate;When the volume of the leacheate is more than During the constant volume of setting, leacheate part output is subjected to counter-infiltration, penetrating fluid and concentrated solution is obtained or by the adverse current Eluate after rinsing carries out counter-infiltration, obtains penetrating fluid and concentrated solution, and the concentrated solution is returned into chemical leaching step In leacheate, until the leacheate volume is equal to the constant volume of setting.
2. according to claim 1 in high concentration, complete circulation type soil, solid waste pollutant chemical leaching separation side Method, it is characterised in that the pollutant is organic matter, the eluent is the organic solution or described that can dissolve the organic matter Pollutant is the heavy metal compound for being insoluble in water, and the eluent is chelating agent, acid or alkali;Or the pollutant is to be soluble in The heavy metal compound of water, the eluent is water.
3. according to claim 1 in high concentration, complete circulation type soil, solid waste pollutant chemical leaching separation side Method, it is characterised in that multiple potchers are disposed with the countercurrent rinsing step, soil, solid waste after the elution Be transported in batches in first potcher, after the rinsing liquid in first potcher is rinsed, by the soil after rinsing, Solid waste is transferred in second potcher, is rinsed by the rinsing liquid in second potcher, by that analogy, until soil Earth, solid waste are removed after the rinsing liquid rinsing in last potcher, wherein, when rinsing in last potcher When pollutant concentration reaches pollutant control aimed concn in liquid, the rinsing liquid in first potcher is arranged as eluate Go out, and the rinsing liquid in second potcher is moved on to as rinsing liquid in first potcher, by that analogy, until will be last After rinsing liquid in one potcher is moved on in potcher thereon as rinsing liquid, filled into last potcher new Fresh rinsing liquid.
4. according to claim 1 in high concentration, complete circulation type soil, solid waste pollutant chemical leaching separation side Method, it is characterised in that be provided with a plurality of countercurrent rinsing branch road, every countercurrent rinsing branch road and be all provided with the countercurrent rinsing step It is equipped with countercurrent rinsing unit;
Soil, solid waste are sequentially input on different countercurrent rinsing branch roads after the elution, are floated respectively via each adverse current The countercurrent rinsing unit washed on branch road carries out repeatedly interim rinsing, until being mingled with the dirt of solution in the soil, solid waste It is identical that dye thing concentration is equal to rinsing liquid volume each in management goal concentration, the countercurrent rinsing unit;
Wherein, the eluate after being rinsed for the first time in rinse unit on every countercurrent rinsing branch road is input to chemical leaching step Leacheate in, and on the M articles countercurrent rinsing branch road in rinse unit the W times rinsing after eluate be input to the M+1 articles Rinsing liquid on countercurrent rinsing branch road in rinse unit as the W-1 times rinsing of the rinse unit, and the M is more than or equal to 1 Natural number, the W is natural number more than or equal to 2.
5. according to claim 4 in high concentration, complete circulation type soil, solid waste pollutant chemical leaching separation side Method, it is characterised in that the interim rinsing includes successively every time:Stirring rinsing and separation of solid and liquid.
6. according to claim 1 in high concentration, complete circulation type soil, solid waste pollutant chemical leaching separation side Method, it is characterised in that in the regeneration cycle step, the penetrating fluid is input in countercurrent rinsing step and is used as rinsing liquid.
7. a kind of high concentration, the chemical leaching piece-rate system of complete circulation type pollutant in soil, the system will suitable for right Seek the chemical leaching separation method described in 1~6, it is characterised in that the system includes:Conveying device (2), equipment for separating liquid from solid (3), countercurrent rinsing device (4), reverse osmosis unit (5), pollutant extraction element (6) and the chemistry pouring for holding leacheate Cleaning device (1);
It is separately provided for detecting the concentration detector of pollutant concentration in the leacheate in the chemical leaching device (1) (11) and for detecting the volume detector (12) of the leacheate volume, the solid output end of the chemical leaching device (1) It is connected with the input of the conveying device (2);
The output end of the conveying device (2) is connected with the input of the equipment for separating liquid from solid (3);
The solid output end of the equipment for separating liquid from solid (3) is inputted by the solid of pipeline (7) and the countercurrent rinsing device (4) End connection, and valve (71), fluid output port and describedization of the equipment for separating liquid from solid (3) are provided with the pipeline (7) Learn the fluid input port connection of elution device (1);
The infiltration of the fluid input port of the countercurrent rinsing device (4) respectively with fresh water source and the reverse osmosis unit (5) Liquid output end is connected, the fluid output port of the countercurrent rinsing device (4) and the fluid input port of the chemical leaching device (1) Connection;
The input of the reverse osmosis unit (5) is connected with the fluid output port of the chemical leaching device (1), the counter-infiltration The concentrated solution output end of device (5) is connected with the fluid input port of the chemical leaching device (1);
The input of the pollutant extraction element (6) is connected with the fluid output port of the chemical leaching device (1), the dirt The fluid output port of dye thing extraction element (6) is connected with the fluid input port of the chemical leaching device (1);
Wherein, the output end of the concentration detector (11) is connected with the control end of the pollutant extraction element (6), the body The output end of product detector (12) is connected with the control end of the reverse osmosis unit (5).
8. high concentration, the chemical leaching piece-rate system of complete circulation type pollutant in soil according to claim 6, its feature exist In the countercurrent rinsing device (4) is made up of multiple countercurrent rinsing branch roads (41) being arranged in parallel successively, and each countercurrent rinsing Rinsing device (411) and the temporary storage tank of eluate (412) are respectively arranged with branch road (41);
Wherein, the solid input of the rinsing device (411) is exported by the solid of pipeline (7) and equipment for separating liquid from solid (3) End connection, and be provided with valve (71) on the pipeline (7), the fluid input port of the rinsing device (411) respectively with it is fresh The penetrating fluid output end connection of water source and the reverse osmosis unit (5), the fluid output port of the rinsing device (411) and institute State the input connection of the temporary storage tank of eluate (412);
The output end of the temporary storage tank of eluate (412) respectively with the fluid input port of the chemical leaching device (1) and under The fluid input port connection of rinsing device (411) in one countercurrent rinsing branch road (41);
Wherein, the rinsing device (411) is filter-pressing device;
Or the rinsing device (411) includes housing (4111), rotating cabin (4112), the first motor (4113), puddler And the second motor (4115) (4114);
Through hole is arranged at intervals with the rotating cabin (4112), rotating cabin (4112) rotation is installed on the housing (4111) It is internal;
The output end of first motor (4113) and the upper end drive connection of the puddler (4114), the puddler (4114) lower end is inserted in the inside of the rotating cabin (4112);
The drive end of second motor (4115) and the rotating cabin (4112) drive connection.
9. high concentration, the chemical leaching piece-rate system of complete circulation type pollutant in soil according to claim 8, its feature exist In the output end input and the pollutant also respectively with the reverse osmosis unit (5) of, the temporary storage tank of eluate (412) The input connection of extraction element (6).
10. high concentration, the chemical leaching piece-rate system of complete circulation type pollutant in soil, its feature according to claim 7 It is, the input of the concentrated solution output end of the reverse osmosis unit (5) also with the pollutant extraction element (6) is connected.
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