CN108838203A - A kind of contaminated soil multi-stage PCE and elution prosthetic device and technique - Google Patents
A kind of contaminated soil multi-stage PCE and elution prosthetic device and technique Download PDFInfo
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- CN108838203A CN108838203A CN201810788621.9A CN201810788621A CN108838203A CN 108838203 A CN108838203 A CN 108838203A CN 201810788621 A CN201810788621 A CN 201810788621A CN 108838203 A CN108838203 A CN 108838203A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
Abstract
The present invention relates to a kind of contaminated soil multi-stage PCE and elution prosthetic device and techniques, device including at least two-stage series connection, the device includes stirring motor (1), stirrer paddle (8), equipment barrel (9), the stirring motor (1) is connected on equipment barrel (9) by sealing and connecting pin (2), the stirrer paddle (8) is connected in the shaft of stirring motor (1), it is placed in equipment barrel (9), filter medium (4) are equipped in the equipment barrel (9), pans (11) are equipped between neighboring devices, fine grain soil outlet (5) connection pans (11) of upper level device, pans (11) connect the mud inlet of next stage arrangement.Compared with prior art, remediation efficiency is high, elution water consumption is few, the operation cycle is short having many advantages, such as also to have while repairing multiple types contaminated soil function by the present invention, can meet soil heterotopic Step gragient elution demand in different operating conditions.
Description
Technical field
The present invention relates to a kind of contaminated soil multi-stage PCE and elution renovation techniques, can carry out efficient repairing to contaminated soil
Multiple processing.
Background technique
With the propulsion of social modernization's process, the industrial or agricultural activity of the mankind causes very big pollution to environment.Especially
Soil environment problem generates greatly harm to the health of the mankind.Repairing and treating is carried out to contaminated soil, has become me
Significant problem in state's city Transformation development process.Soil leaching technology both can be used for heavy-metal contaminated soil reparation, can also
For organic polluted soil reparation, technology is flexible, simple process, but the problem that elution efficiency is lower, especially for viscosity
Soil becomes and limits the key that this technology plays larger effect.Since pollutant is unevenly distributed in the soil, different-grain diameter soil
Also there is significant difference to the absorption and enrichment trend of pollution, it is obvious in specified particle diameter enrichment, and in the soil of the ranges such as coarse grain
Pollutant concentration is lower.Therefore soil property improvement or reparation after being classified using this characteristic.To its soil particle diameter into
The common method of row classification has sieve method, settling methods etc., but the operation is big to the classification and acquisition of fine grain soil
Fine grain soil of amount etc., there are inefficiency, precision is lower the problems such as.During sieve method operates, since particle is easy
It is accumulated in screen surface, causes grain size grading inaccurate, be easy to cause grit hole to build bridge and block, so that being lower than screen size
Soil also sieve top accumulate, technique can not continue carry out.This is also most of screen fractionation operations or its improvement at present
Equipment can not efficient operation basic reason.Settling methods require particle to be uniformly dispersed in the solution, join to sedimentation time etc.
Several assurance difficulty is higher, and can not largely soil high-efficiency and continuous be handled.Therefore consider to research and develop a kind of new process, will pollute
Soil carries out grain size grading and concentration minimizing, carries out targetedly elution etc. for the high partial size soil of pollutant load and repairs
It returns to work work, to improve remediation efficiency.Currently, the research majority of China's Step gragient elution technology stays in the laboratory research stage,
And by classification technique in conjunction with chemical leaching technology, for repair the research of different-grain diameter contaminated soil be also it is considerably less, it is close several
In year only patent " a kind of arsenic and heavy-metal contaminated soil dystopy Step gragient elution repair set technique "
(201510316716.7) the heavy-metal contaminated soil dystopy Step gragient elution provided repairs set technique, is extracted by magnetic separating
And metal target is recycled, at three-level, stone chad is directly used as vibrosieve after clear water rinses after non-magnetic components are just broken
Construction material sieves resulting thick, fine grained soil and respectively enters what two-step washing mixing plant generate after washing cleaning
Mud is separated by solid-liquid separation, and passes through addition solidification and stabilization agent after reuse sludge dewatering treatment after ring waste is purified and regeneration
Equal repair materials are to its safe disposal, and soil particle can backfill after processing.The invented technology low, treatment effeciency with rehabilitation cost
The advantages that height, energy saving.But two-step washing stirring can only be done in the technique to repair, work is repaired in the screening that not can be carried out more stages
Make, is unfavorable for the development of multiregion contaminated soil remediation work.Therefore, it is badly in need of developing a kind of Polluted Soil for being applicable in more particle size ranges
Earth multi-stage PCE and elution renovation technique.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to greatly improve pollution
The contaminated soil multi-stage PCE and elution prosthetic device of the remediation efficiency of soil.
The purpose of the present invention can be achieved through the following technical solutions：A kind of contaminated soil multi-stage PCE and elution are repaired
Device, which is characterized in that the device including at least two-stage series connection, the device include stirring motor, stirrer paddle, device cartridge
Body, the stirring motor are connected in equipment barrel by sealing and connecting pin, and the stirrer paddle is connected to stirring electricity
It in the shaft of machine, is placed in equipment barrel, filter medium is equipped in the equipment barrel, is set above the equipment barrel
There is mud inlet, cake discharge pressure inlets, lower section are exported equipped with fine grain soil, and phegma outlet, bottom is equipped with filter cake discharge port,
Pans, the fine grain soil outlet connection pans of upper level device are equipped between neighboring devices, pans connect next stage
The mud inlet of device.
The aperture of filter medium described in concatenated devices at different levels is different, and from first order further device to the end, mistake
The aperture of filter medium is sequentially reduced.
The filter medium is placed between stirrer paddle and equipment barrel inner wall, in filter medium surfaces externally and internally pressure difference
Under the action of, little particle Soil slurry is separated by filter medium, and is collected, is discharged by discharge port.
The mud inlet is mounted on sealing and connecting pin, and space where stirrer paddle in connectivity device cylinder.
The stirrer paddle is arranged in the shaft of stirring motor, and along cylinder Spiral distribution, stirrer paddle outside
The distance between edge and filter medium inner surface are 1-3mm.Stirrer paddle is close with filter medium but does not contact, and can reduce filter cake
It is deposited in the bridging of inner barrel filter media surface.
The filter medium needs to select aperture and material according to soil to be processed.
Soil to be processed and water are mixed into raw material slurry, are placed in former slurry tank, former slurry tank is connected by level-one feed pump
Mud inlet, the phegma outlet connect former slurry tank.
It is a kind of using the contaminated soil multi-stage PCE and the technique for eluting prosthetic device, which is characterized in that including with
Lower step：
1) technological preparation
According to the technological requirements, the filter medium of effectiveness of classification size is selected to be mounted in equipment barrel, stages of connecting；
2) level-one Step gragient elution
Contaminated soil to be processed and water are mixed into raw slurry, are placed in former slurry tank, is inputted by level-one feed pump
The mud inlet of further device carries out elution operation and grain size grading operation, middle partial size and following simultaneously inside equipment barrel
Partial size soil particle enters level-one pans by the outlet of fine grain soil after filter medium, and coarse grain diameter soil is then from cylinder
Discharge, carries out the subsequent processing such as being dehydrated in the filter cake discharge port of bottom；
3) second level Step gragient elution
Into the soil slurries of pans, the concatenated device of subsequent stages is sequentially entered through pump, soil passed through in slurries
Filter medium is successively classified and comes out；
4) after the soil for being classified out by stages is carried out dehydrating respectively, in conjunction with different-grain diameter pollutant characteristic,
It carries out solidification and stabilization or other repairs operation.
Pipe of receiving after technique waste water progress purified treatment discharges.
Compared with prior art, the present invention has the following advantages that：
(1) present invention is that contaminated soil multi-stage PCE elutes renovation technique, mainly realizes that equipment is a kind of soil particle diameter
Rapid classification device, so that screening aimed at precision is greatly improved, is being known by selecting the filter medium in aimed at precision aperture
In the case where knowing target particle sizes size, it is not necessarily to analysis of experiments, the filter medium that need to only select corresponding precision, which is installed to, to be set
In standby.So that being not necessarily to too many preliminary preparation in detailed programs case, realization is come working forms i.e., effectively
Labor intensity is reduced, the production cycle is reduced, improving effectiveness of classification, high practical value.
(2) present invention is that contaminated soil multi-stage PCE elutes renovation technique, and in concrete technology, classification repairs work with elution
Work is to be completed at the same time, and reduces reparing process, shortens repairing efficiency.
(3) present invention is that contaminated soil multi-stage PCE elutes renovation technique, in technical process, using plural serial stage shape
Formula realizes variable grain range, the elution reparation of variety classes pollutant in same process.
(4) present invention is that contaminated soil multi-stage PCE elutes renovation technique, and during process implementing, single process classification is repaired
It is multiple, so that elution water consumption substantially reduces.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of device；
Fig. 2 is the concatenated structural schematic diagram of secondary device.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Fig. 1~2, a kind of contaminated soil multi-stage PCE and elution prosthetic device and technique, including at least two-stage string
The soil of connection is concentrated and elution prosthetic device (being illustrated by taking two-stage series connection as an example in the present embodiment), and the device includes stirring
Motor 1, stirrer paddle 8, equipment barrel 9 are mixed, the stirring motor 1 is connected to equipment barrel 9 by sealing and connecting pin 2
On, the stirrer paddle 8 is connected in the shaft of stirring motor 1, is placed in equipment barrel 9, in the equipment barrel 9
Equipped with filter medium 4, mud inlet 10, cake discharge pressure inlets 3 are equipped with above the equipment barrel 9, lower section is equipped with fine grain
Soil outlet 5, phegma outlet 7, bottom are equipped with filter cake discharge port 6, and soil to be processed and water are mixed into raw material slurry, are placed in raw material
It starches in tank 12, former slurry tank 12 connects mud inlet 10, the 7 connection raw material slurry of phegma outlet by level-one feed pump 13
Tank 12.
Pans 11, the 5 connection pans 11 of fine grain soil outlet of further device, pans are equipped between neighboring devices
11 connect the mud inlet 10 ' of secondary device by second level feed pump 13 ', and secondary device top is equipped with cake discharge pressure inlets 3 ',
Lower part is equipped with fine grain soil outlet 5 ' and phegma outlet 7 ', and phegma outlet 7 ' returns to connection pans 11, fills through level-one
Soil slurries after setting elution classification enter pans 11, input secondary device, middle partial size and particulate by second level feed pump 13 '
Diameter soil is classified out after secondary filtration medium the two.After then two kinds of partial size soil are carried out dehydrating respectively,
In conjunction with different-grain diameter pollutant characteristic, carries out solidification and stabilization or other repair operation.In addition, technique waste water carries out at purification
Pipe of being received after reason discharge.
The aperture of filter medium 4 described in concatenated devices at different levels is different, and from first order further device to the end, mistake
The aperture of filter medium 4 is sequentially reduced.The filter medium 4 is placed between stirrer paddle 8 and equipment barrel inner wall 9, in mistake
Under the action of filter medium surfaces externally and internally pressure difference, little particle Soil slurry is separated by filter medium 4, and passes through discharge port 5
It is collected, is discharged.The mud inlet 10 is mounted on sealing and connecting pin 2, and stirrer paddle in connectivity device cylinder 9
8 places space.The stirrer paddle 8 is arranged in the shaft of stirring motor 1, and along cylinder Spiral distribution, stirrer paddle 8
The distance between outer edge and 4 inner surface of filter medium are 1-3mm.Stirrer paddle 8 is close with filter medium but does not contact, and can subtract
Few filter cake is deposited in the bridging of inner barrel filter media surface.The filter medium 4 needs to select according to soil to be processed
Select aperture and material.
The technique that contaminated soil multi-stage PCE and elution are carried out using above-mentioned apparatus, is included the following steps：
1) technological preparation
According to the technological requirements, the filter medium 4 of effectiveness of classification size is selected to be mounted in equipment barrel 9, dresses at different levels of connecting
It sets；
2) level-one Step gragient elution
The contaminated soil for weighing a certain amount of removal building waste, is then mixed into original with water for the contaminated soil after weighing
Slurry liquid is placed in former slurry tank 12, the mud inlet 10 of further device is inputted by level-one feed pump 13, in equipment barrel 9
Internal to carry out elution operation and grain size grading operation simultaneously, middle partial size and following partial size soil particle lead to after filter medium 4
It crosses fine grain soil outlet 5 and enters level-one pans 11, coarse grain diameter soil, which then passes through refluxing opening 7 and returns in former slurry tank 12, to be become
For raw material slurry, the coarse grain diameter soil being finally concentrated then is discharged out of cylinder body bottom filter cake discharge port 6, carries out the subsequent place such as being dehydrated
Reason；
3) second level Step gragient elution
Soil slurries second level feed pump 13 ' into pans 11 inputs secondary device, middle partial size and fine grain in slurries
Soil is classified out after secondary filtration medium the two.After then two kinds of partial size soil are carried out dehydrating respectively, knot
Different-grain diameter pollutant characteristic is closed, solidification and stabilization is carried out or other repairs operation.In addition, technique waste water carries out purified treatment
After receive pipe discharge.
Embodiment 2
It is tested using soil particle diameter rapid classification device, investigates contaminated soil multi-stage PCE elution renovation technique to soil
250 microns or more bulky grain screenings and 100 microns or less grading effects in earth.
1) system prepares
The soil and water for selecting removal branch and huge rock particles carry out in stirring container according to solid-to-liquid ratio for 1 to 5
Mixing.The filter medium that 250 microns retain precision is crossed into the filter medium for retaining precision with 100 microns and is separately mounted to technique stream
In journey in two-stage soil particle diameter rapid classification device, then filter medium is fixed with device connection structure.
2) it is passed through material
By the mud after soil and water stirring in the present apparatus, entered in 250 micrometer apparatus of level-one by feed pump.And it is logical
Exhaust outlet is opened before entering, gas in cylinder is discharged, and agitating paddle needs to start and revolving speed is adjusted to 30r/ during being passed through
Water in mud and soil particle system are maintained at even suspension state by min.
3) two-stage progressive operation
After material is full of cylinder in device, exhaust outlet is closed, the outlet of fine grain soil and phegma outlet is opened, passes through
Inner barrel gauge pressure is classification pressure difference to be formed in filter medium surfaces externally and internally, less than 250 microns under the driving of 0.15Mpa pressure
Little particle soil be graded out by filter medium and enter in pans, in the process 250 microns or more in system
Particle is constantly concentrated, and the slurries in pans enter 100 microns of second level of soil particle diameter rapid classification device by pump
Middle to carry out identical charging and progressive operation, the finally fine grained outlet from secondary device of the Soil slurry less than 100 microns is arranged
Out.
4) cake discharge arranges bulky grain
In entire mud system, when pressure constantly increases in two-stage equipment barrel, and little particle exports amount of liquid very little, close
It closes refluxing opening and agitating paddle carries out dehydration, by material dewatering in remaining system at bulky grain filter cake.Cake discharge pressure is opened at this time
Power import enters the pressed gas greater than cylinder internal pressure inside equipment, so that the bulky grain filter cake on filter medium is de-
It falls, and cylinder is discharged from filter cake discharge port, the filter cake thickness for measuring discharge is about 2cm.
5) data are analyzed
To after the raw slurry and classification being classified out in above-mentioned two-stage classification process bulky grain filter cake intermediate state filter cake and
Little particle liquid carries out grain size analysis.It was found that the particle fraction in raw slurry greater than 250 microns is about 15%, 250 microns are arrived
100 microns of particle fraction is about 48%；And the granularity for the little particle liquid being classified out by 2 grades of grading plants is shown,
In grain graininess ratio greater than 100 microns be 0, that is, be not present, in intermediate state filter cake 250 microns to 100 micron particles
Partial size accounting example is 86%, and the granularity data in the bulky grain filter cake that level-one separates then is shown, there is about 91% in filter cake
Particle is the bulky grain greater than 250 microns.It can be concluded that the target grain size particle overwhelming majority can quilt during series classification
It is classified out.For investigate subsequent contamination soil in 250 microns or more 100 microns of bulky grain pollutant or less particulate pollutants and between
Intermediate state grain diameter pollutant elution repair among the two lays the foundation.
Embodiment 3
The test of Step gragient elution repairing test, verifying contaminated soil multi-stage PCE leaching are carried out using process described in embodiment 1
Renovation technique is washed to the repairing effect of partial size pollutant each in soil.Know that the soil is combined pollution after testing, is primarily present
Two kinds of pollutants of Pb, As, concentration are respectively 4250mg/kg and 610mg/kg, detect and know after pre-classification, 92% Pb member
Element is gathered in greater than within the scope of 250 micron grain sizes, and 85% As element aggregation is in 100-250 microns of partial size.
1) system prepares
The soil of removal branch and huge particle is selected to be mixed in stirring container according to solid-to-liquid ratio for 1 to 5 with water.
The filter medium that 250 microns retain precision is crossed the filter medium for retaining precision with 100 microns to be separately mounted in process flow
In two-stage soil particle diameter rapid classification device, then filter medium is fixed by device connection structure.Greater than 250 microns
Grain pollutant is using elution medicament A, and 100-250 micron particles pollutant is using elution medicament B.
2) it is passed through material
By the mud after soil and water stirring in the present apparatus, entered in 250 microns of screening plants of level-one by feed pump,
Elution medicament A is added simultaneously, and to open exhaust outlet before being passed through, gas in cylinder is discharged, agitating paddle needs during being passed through
Start and revolving speed be adjusted to 30r/min, water in mud and soil particle system are maintained at even suspension state.
3) two-stage Step gragient elution operates
After material is full of cylinder in device, exhaust outlet is closed, the outlet of fine grain soil and phegma outlet is opened, passes through
Inner barrel gauge pressure is classification pressure difference to be formed in filter medium surfaces externally and internally, less than 250 microns under the driving of 0.15Mpa pressure
Little particle soil be graded out by filter medium, and entered in pans by discharge port, in the process system
Interior 250 microns or more particles are constantly concentrated and carry out sufficiently elution with medicament A and repaired, and the slurries in pans pass through pump,
Enter the Step gragient elution behaviour that identical charging and adding medicine B are carried out in 100 microns of second level of soil particle diameter rapid classification device
Make, this operation carries out elution repair to intermediate state grain particles, and Soil slurry of the last partial size less than 100 microns is from second level
Fine grained outlet is discharged into barrel in device.
4) cake discharge arranges bulky grain
In entire mud system, when pressure constantly increases in two-stage equipment barrel, and little particle exports amount of liquid very little, close
It closes refluxing opening and agitating paddle carries out single filter process, by material dewatering in remaining system at bulky grain filter cake.It opens and unloads at this time
Cake pressure inlets enter the pressed gas greater than cylinder internal pressure inside equipment, so that the bulky grain filter cake on filter medium
It falls off, and cylinder is discharged from filter cake discharge port, the filter cake thickness for measuring discharge is about 2cm.
5) data are analyzed
Each partial size soil pollutant separated in above-mentioned two-stage classification repair process test and analyze and is known：250 microns
Above soil particle, the scrubbed removal rate for repairing the Pb after operation is 93%, between 100 microns to 250 microns
Soil particle, it is scrubbed after As element removal rate be 85%.By Step gragient elution, elution therapeutic amount and kind can be carried out
Accurately adding for class, significantly improves efficiency and reduces cost.
Embodiment 4
Device is equipped with level Four, remaining is the same as embodiment 2.
Claims (9)
1. a kind of contaminated soil multi-stage PCE and elution prosthetic device, which is characterized in that the device including at least two-stage series connection, institute
The device stated includes stirring motor (1), stirrer paddle (8), equipment barrel (9), and the stirring motor (1) is by sealing and even
It connects end (2) to be connected on equipment barrel (9), the stirrer paddle (8) is connected in the shaft of stirring motor (1), is placed in
In equipment barrel (9), filter medium (4) are equipped in the equipment barrel (9), mud is equipped with above the equipment barrel (9)
Slurry inlet (10), cake discharge pressure inlets (3), lower section are equipped with fine grain soil outlet (5), and phegma exports (7), and bottom is equipped with filter
Cake discharge port (6) is equipped with pans (11) between neighboring devices, and fine grain soil outlet (5) connection of upper level device is intermediate
Tank (11), pans (11) connect the mud inlet of next stage arrangement.
2. a kind of contaminated soil multi-stage PCE according to claim 1 and elution prosthetic device, which is characterized in that strings at different levels
The aperture of filter medium described in the device of connection (4) is different, and from first order further device to the end, filter medium (4)
Aperture is sequentially reduced.
3. a kind of contaminated soil multi-stage PCE according to claim 1 and elution prosthetic device, which is characterized in that described
Filter medium (4) is placed between stirrer paddle (8) and equipment barrel (9), small under differential pressure action inside and outside filter medium
Granular soil mud is separated by filter medium (4), and is collected, is discharged by discharge port (5).
4. a kind of contaminated soil multi-stage PCE according to claim 1 and elution prosthetic device, which is characterized in that described
Mud inlet (10) is mounted on sealing and connecting pin (2), and space where connectivity device cylinder (9) interior stirrer paddle (9).
5. a kind of contaminated soil multi-stage PCE according to claim 1 and elution prosthetic device, which is characterized in that described
Stirrer paddle (8) is arranged in the shaft of stirring motor (1), and along cylinder Spiral distribution, stirrer paddle (8) outer edge and mistake
The distance between filter medium (4) inner surface is 1-3mm.
6. a kind of contaminated soil multi-stage PCE according to claim 1 and elution prosthetic device, which is characterized in that described
Filter medium (4) needs to select aperture and material according to soil to be processed.
7. a kind of contaminated soil multi-stage PCE according to claim 1 and elution prosthetic device, which is characterized in that be processed
Soil and water are mixed into raw material slurry, are placed in former slurry tank (12), and former slurry tank (12) connects mud by level-one feed pump (13)
Slurry inlet (10), the phegma outlet (7) connect former slurry tank (12).
8. a kind of technique using contaminated soil multi-stage PCE described in claim 1 and elution prosthetic device, which is characterized in that
Include the following steps：
(1) technological preparation
According to the technological requirements, the filter medium (4) of effectiveness of classification size is selected to be mounted in equipment barrel (9), dresses at different levels of connecting
It sets；
(2) level-one Step gragient elution
Contaminated soil to be processed and water are mixed into raw slurry, are placed in former slurry tank (12), by level-one feed pump (13)
The mud inlet (10) for inputting further device carries out elution operation in equipment barrel (9) inside simultaneously and grain size grading operates, in
Partial size and following partial size soil particle enter level-one pans by fine grain soil outlet (5) after filter medium (4)
(11), coarse grain diameter soil, which then passes through refluxing opening (7) and returns in former slurry tank (12), becomes raw material slurry, the coarse grain being finally concentrated
The discharge out of cylinder body bottom filter cake discharge port (6) of diameter soil, carries out the subsequent processing such as being dehydrated；
(3) second level Step gragient elution
Into the soil slurries of pans (11), the concatenated device of subsequent stages is sequentially entered through pump, soil passed through in slurries
Filter medium is successively classified and comes out；
(4) it after the soil for being classified out by stages is carried out dehydrating respectively, in conjunction with different-grain diameter pollutant characteristic, carries out
Solidification and stabilization or other reparation operations.
9. the technique according to claim 8 using contaminated soil multi-stage PCE and elution prosthetic device, which is characterized in that
Pipe of receiving after technique waste water progress purified treatment discharges.
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| CN201810788621.9A CN108838203B (en) | 2018-07-18 | 2018-07-18 | Contaminated soil grading concentration and leaching remediation device and process |
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| CN201810788621.9A CN108838203B (en) | 2018-07-18 | 2018-07-18 | Contaminated soil grading concentration and leaching remediation device and process |
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| CN111781329A (en) * | 2020-05-25 | 2020-10-16 | 清华大学 | Rapid screening device and method for soil leaching restoration applicability |
| CN112692045A (en) * | 2020-11-30 | 2021-04-23 | 四川长虹格润环保科技股份有限公司 | Leaching process for repairing high-load metal polluted soil |
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