CN107486468A - One kind is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism - Google Patents
One kind is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism Download PDFInfo
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- CN107486468A CN107486468A CN201710696166.5A CN201710696166A CN107486468A CN 107486468 A CN107486468 A CN 107486468A CN 201710696166 A CN201710696166 A CN 201710696166A CN 107486468 A CN107486468 A CN 107486468A
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- hexavalent chromium
- microorganism
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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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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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
- B09C1/08—Reclamation of contaminated soil chemically
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- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses one kind to be used for hexavalent chromium polluted soil heterotopic repairing method of microorganism, including：The Analysis on Pollution Characteristics of hexavalent chromium polluted soil, Analysis on Pollution Characteristics include the test of hexavalent chromium concentration；Pretreatment, pretreatment include the test and regulation of contaminated soil particle diameter, acid-base value and moisture content；It is placed in after contaminated soil, microbial bacterial agent and nutritive salt are stirred in prosthetic device and carries out microorganism remediation.The present invention is a kind of sustainable restorative procedure of green, and by the introducing of microorganism remediation, the addition of chemical agent is greatly lowered, and largely improves soil ecology function, accomplishes appropriate reparation, science reparation.
Description
Technical field
The present invention relates to hexavalent chromium polluted technical field of soil remediation, more particularly to one kind are different for hexavalent chromium polluted soil
Position repairing method of microorganism.
Background technology
For a long time, chromium salt production enterprise in China's does not take any seepage control measure, Cr VI to the place for stacking chromium slag
As rainfall etc. enters surrounding soil and underground water, environment is caused seriously to pollute, serious threat is brought to human health；Cause
This, it is particularly significant to the Controlling research of hexavalent chromium polluted soil.
Filled out safely after using wet method detoxifcation technique currently for chromium slag, dregs mixture and high concentration chromium contaminated soil
Bury, the restorative procedure of electronation is typically used for the hexavalent chromium polluted soil of middle low concentration, but it is big due to chemical agent
Amount addition causes the soil salinization serious, causes the forfeiture of soil ecology function after repairing.
The content of the invention
Weak point present in regarding to the issue above, the present invention provide one kind and are used for the micro- life of hexavalent chromium polluted soil heterotopic
Thing restorative procedure.
To achieve the above object, present invention offer one kind is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism, wraps
Include：
The Analysis on Pollution Characteristics of step 1, hexavalent chromium polluted soil, the Analysis on Pollution Characteristics include the survey of hexavalent chromium concentration
Examination；
Step 2, pretreatment, the pretreatment include the test and regulation of contaminated soil particle diameter, acid-base value and moisture content；
Step 3, it is placed in after contaminated soil, microbial bacterial agent and nutritive salt are stirred in prosthetic device and carries out microorganism
Repair.
As a further improvement on the present invention, in step 2, pretreated contaminated soil particle diameter≤5cm, acid-base value are
5-8, moisture content 20%-30%.
As a further improvement on the present invention, in step 3, the microbial bacterial agent is sulfate reducing bacteria, the battalion
Supporting salt includes the one or more in organic fertilizer and glucose, methanol.
As a further improvement on the present invention, the mass fraction of organic fertilizer is 1-2% in the nutritive salt, the matter of glucose
Amount fraction is 1-2%, and the mass fraction of methanol is 0.5-1%, the mass fraction ＞ 30% of organic matter in organic fertilizer.
As a further improvement on the present invention, in step 3, the condition of the microorganism remediation is：The six of contaminated soil
Valency chromium concn≤500mg/kg, acid-base value 8-9, moisture content 60%-70%, temperature are 27 DEG C -30 DEG C.
As a further improvement on the present invention, as the hexavalent chromium concentration ＞ 500mg/kg of contaminated soil, repaiied in microorganism
Electronation is carried out before multiple, the electronation carries out hexavalent chrome reduction including the use of chemical reducing agent to contaminated soil, by dirt
The hexavalent chromium concentration of dye soil is adjusted to≤500mg/kg.
As a further improvement on the present invention, chemical reducing agent ferrous sulfate, sodium pyrosulfite, calcium polysulfide and the iron
One kind in powder.
As a further improvement on the present invention, the prosthetic device includes：Accommodate the container of contaminated soil；
The container includes cell body and top plate, and the inner surface of the cell body and top plate is equipped with heat-insulation layer；
Multiple thermocouples for the monitoring pollution soil moisture are laid with the top plate and multiple for heating pollution
The heating rod of soil, all parallel thermocouples are accessed on the thermocouple wire of temperature controllers, all heating rods accesses in parallel
The power end of temperature controller.
As a further improvement on the present invention, the prosthetic device also includes：For supplementing microorganism into contaminated soil
The thrust-type injection device of microbial inoculum and nutritive salt；
The thrust-type injection device includes membrane pump, and the air inlet of the membrane pump is connected with air compressor machine, the barrier film
The charging aperture of pump is connected with medicament barrel, and the discharging opening of the membrane pump is connected by pharmaceutical pipeline with thrust-type injection needle；
The thrust-type injection needle is tip and tube wall sets round-meshed hollow hard structure, the thrust-type injection needle
Tube wall percent opening is 9-12%, and pressure gauge and flowmeter are provided with the pharmaceutical pipeline.
As a further improvement on the present invention, the side of the cell body is provided with reinforcement, the bottom installation of the cell body
There is slot type guide rail；The heat-insulation layer is rock-wool heat insulation plate, and the thermocouple is fixed K-type thermocouple, and the heating rod is low
Warm heating rod.
Compared with prior art, beneficial effects of the present invention are：
The present invention is a kind of sustainable restorative procedure of green, and by the introducing of microorganism remediation, chemistry is greatly lowered
The addition of medicament, and largely improve soil ecology function, accomplish appropriate reparation, science reparation；
The present invention prosthetic device can on a large scale, high quality offer microorganism remediation contaminated soil environment, move
Property it is strong, flexibility ratio is high, and automaticity is high, can increase substantially remediation efficiency.
Brief description of the drawings
Fig. 1 is the disclosed flow for being used for hexavalent chromium polluted soil heterotopic repairing method of microorganism of an embodiment of the present invention
Figure；
Fig. 2 is the structural representation of prosthetic device disclosed in an embodiment of the present invention；
Fig. 3 is the top view of cell body in Fig. 2；
Fig. 4 is the side view of cell body in Fig. 2；
Fig. 5 is the upward view of cell body in Fig. 2；
Fig. 6 is the top view of top plate in Fig. 2；
Fig. 7 is the sectional view of top plate in Fig. 2；
Fig. 8 is the structural representation of temperature controller in Fig. 2；
Fig. 9 is the structural representation of thrust-type injection device disclosed in an embodiment of the present invention；
Figure 10 is the structural representation after prosthetic device series connection disclosed in an embodiment of the present invention.
In figure：
10th, container；11st, cell body；12nd, top plate；13rd, reinforcement；14th, slot type guide rail；20th, heat-insulation layer；30th, thermocouple；40、
Heating rod；50th, temperature controller；51st, thermocouple wire；52nd, power end；60th, thrust-type injection device；61st, membrane pump；62nd, air compressor machine；
63rd, medicament barrel；64th, pharmaceutical pipeline；65th, thrust-type injection needle；66th, pressure gauge；67th, flowmeter.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
In the description of the invention, it is also necessary to explanation, unless otherwise clearly defined and limited, term " installation ",
" connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly be connected
Connect；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can
To be the connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition
Concrete meaning in the present invention.
The present invention provides one kind and is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism, and repairing method of microorganism is one
Hexavalent chrome reduction is trivalent chromium and stabilized by the sustainable repair mode of kind green, the biological agent by microorganism；
The restorative procedure includes：The Analysis on Pollution Characteristics of hexavalent chromium polluted soil, pretreatment, electronation and microorganism remediation.Its
In, the Analysis on Pollution Characteristics of hexavalent chromium polluted soil includes the hexavalent chromium concentration to contaminated soil, leaches hexavalent chromium concentration, soda acid
The test analysis of degree and soluble state Cr VI；Contaminated soil pretreatment includes carrying out the particle diameter of soil, acid-base value, moisture content etc.
Test and corresponding regulation；Contaminated soil electronation processing is included to the pollution beyond microorganism remediation hexavalent chromium concentration category
Soil carries out hexavalent chrome reduction, reduces soil toxicity；Contaminated soil microorganism remediation is included by microbial bacterial agent, preference nutrition
Salt adds and the creation of suitable growth environment and holding process.
The present invention is a kind of sustainable restorative procedure of green, and by the introducing of microorganism remediation, chemistry is greatly lowered
The addition of medicament, and largely improve soil ecology function, accomplish appropriate reparation, science reparation.
The present invention is described in further detail below in conjunction with the accompanying drawings：
As shown in figure 1, the present invention, which provides one kind, is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism, including：
The Analysis on Pollution Characteristics of step 1, hexavalent chromium polluted soil：
It is dense that the Analysis on Pollution Characteristics of hexavalent chromium polluted soil includes the hexavalent chromium concentration to contaminated soil, leaching Cr VI
The test analysis of degree, acid-base value and soluble state Cr VI, the purpose of the Analysis on Pollution Characteristics of hexavalent chromium polluted soil are to different
Position repairs the clear pollution condition for digging contaminated soil and carries out detailed grasp, to microorganism can repairing hexavalent chromium concentration category soil
Clearly divided, the soil beyond microorganism remediation hexavalent chromium concentration category reduces by six by way of adding chemical reducing agent
Valency chromium concn, to reach the OK range that can carry out microorganism remediation, with experiment experience, microorganism remediation contaminated soil sexavalence
Chromium concn answers≤500mg/kg.Wherein, the hexavalent chromium concentration of contaminated soil, leaching hexavalent chromium concentration, acid-base value and soluble state six
The method for testing and analyzing of valency chromium can refer to (GB 5085.3-2007) respectively《Before the sample of annex T solid waste sexavalence chromium analysis
Handle alkali resolution method》、《The measure diphenyl carbazide spectrophotometry of water quality Cr VI》(GB7467-87)、《The total chromium of water quality
Measure》(GB7466-87), USEPA 3060A, BCR forms extraction method,《The measure of forest soil pH value》(LY/T1239-
1999) etc..
Step 2, contaminated soil pretreatment：
Contaminated soil pretreatment includes testing the particle diameter of contaminated soil, acid-base value, moisture content etc. and adjusting accordingly
Section, the purpose of contaminated soil pretreatment are to be easy to contaminated soil to be uniformly mixed with microbial bacterial agent and nutritive salt.Pollution
The pretreatment of soil particle diameter can by sieving approach, the mode such as roll by particle size adjustment to≤5cm；Should be by soil before microorganism remediation
Earth acid-base value is adjusted to 5-8, and hexavalent chromium polluted soil often in alkalescence, is if necessary adjusted acid-base value to reaction bar using sulfuric acid
Part；Contaminated soil moisture content can be adjusted to 20%-30% by turning over the modes such as throwing drying or watering before microorganism remediation.
Step 3, as the hexavalent chromium concentration ＞ 500mg/kg of contaminated soil, should first to contaminated soil carry out electronation at
Reason, the hexavalent chromium concentration of contaminated soil is adjusted to≤500mg/kg；Then microorganism remediation is carried out；When the sexavalence of contaminated soil
Chromium concn≤500mg/kg, directly carry out microorganism remediation.Wherein：
Contaminated soil electronation processing is included to beyond microorganism remediation hexavalent chromium concentration category (＞ 500mg/kg)
Contaminated soil carries out hexavalent chrome reduction, reduces soil toxicity；Specific method is：Pass through ALLU sieving approach bucket, integration stirring
Equipment etc. stirs reproducibility medicament, contaminated soil and water, and end-state is terminal to nearly saturation but without Free water outflow,
Heap covering isolation air care 5-7 days is played, detection again ensures that hexavalent chromium concentration is less than 500mg/kg；Reducing agent is mainly sulfuric acid
Ferrous iron, sodium pyrosulfite, calcium polysulfide, iron powder etc..
Contaminated soil microorganism remediation includes adding and suitable growth environment by microbial bacterial agent, preference nutritive salt
Create and keep process.The process completes contaminated soil by agitation mixer and microbial bacterial agent, the uniform of nutritive salt stir
Mix, microbial growth and growth course under suitable condition are completed by prosthetic device, so as to be carried out to hexavalent chromium polluted soil
Microorganism remediation.
Microorganism remediation principle is the product by the activity of microorganism its life as secreted the ectoenzyme with reproducibility
Deng being trivalent chromium by hexavalent chrome reduction, so as to reduce hexavalent chromium concentration, repairing polluted soil.Therefore it provides objective quantities is micro-
Biological flora and suitable growing environment are particularly important conditions, are verified by being cultivated in Literature Consult and laboratory, this hair
The condition that bright hexavalent chromium polluted edaphon is repaired is：Hexavalent chromium concentration≤500mg/kg of contaminated soil, acid-base value 8-
9, moisture content 60%-70%, temperature are 27 DEG C -30 DEG C；Conventional microbial bacterial agent is sulfate reducing bacteria, and nutritive salt includes
One or more in organic fertilizer and glucose, methanol, the mass fraction of organic fertilizer is 1-2% in nutritive salt, the matter of glucose
Amount fraction is 1-2%, and the mass fraction of methanol is 0.5-1%, the mass fraction ＞ 30% of organic matter in organic fertilizer.Microorganism gives birth to
Long repair keeps environment to pass through lasting prosthetic device of the insulation with temperature detection to realize, passes through the thermocouple pair in heat-insulation layer
The soil moisture is detected in monomer container, is maintained the temperature between 27-30 DEG C, once less than 27 DEG C, starts heating rod；Every batch
The duty cycle for carrying out microorganism remediation soil is 2-4 months.
One kind of the invention, which is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism, to be divided into before prosthetic device
Part and the part that enters after prosthetic device, wherein, the main purpose that front portion is implemented is by hexavalent chromium polluted soil
Content of 6-valence Cr ions, acid-base value and moisture content, which are adjusted to suitable for microorganism, grows the physico chemical factor repaired；What rear portion was implemented
Main purpose promotes the biological reducing of Cr VI to act on to provide microorganism suitable propagation growth conditions.Wherein, repaiied in entrance
Before apparatus for coating, can be put into contaminated soil conveniently in the container of lifting, such as jumbo bag, can be easy to putting for every batch repairing polluted soil
Enter and take out.
As shown in figs. 2-10, the present invention provides a kind of reparation for hexavalent chromium polluted soil heterotopic microorganism remediation and filled
Put, insulation, temperature monitoring and automatic heating function can be achieved.The prosthetic device includes：Accommodate the container of hexavalent chromium polluted soil
10th, heat-insulation layer 20, thermocouple 30, heating rod 40, temperature controller 50 and the thrust-type injection device of the inner surface of container 10 are arranged on；Hold
Device 10 includes cell body 11 and top plate 12, and the inner surface of cell body 11 and top plate 12 is equipped with heat-insulation layer 20, and heat-insulation layer 20 is detachably set
Put and thickness can adjust；Multiple thermocouples 30 for the monitoring pollution soil moisture are laid with top plate 12 and multiple for adding
The heating rod 40 of thermal pollution soil, all thermocouples 30 are in parallel to be accessed on the thermocouple wire of temperature controllers 50, and all heating rods 40 are simultaneously
Couple the power end into temperature controller 50, Fig. 2 only shows the connection of part heating rod and temperature controller.Wherein：
The cell body 11 of the container 10 of the present invention can be according to the selection brick such as time that device uses, field condition, construction cost
Block, steel plate welding, concrete structure etc., if the covering device is as project construction, disposably input can use brick or coagulation civil engineering
Make, Liftable equipment can be welded into by steel plate if device can be used for multiple times in conduct.Top plate 12 is the top cover of cell body 11, for groove
The installation of the thermal-insulating sealing and temperature control component (thermocouple 30 and heating rod 40) of body 11, top plate 12 can use PVC or ABS etc.
Lightweight engineered plastic material, drill and install in the point position of thermocouple 30 and heating rod 40.In order to improve the heat-insulating property of container 10,
The present invention is lined with heat-insulation layer 20 in the face of inside 5 of cell body 11 (4 sides and 1 bottom surface), is lined with protecting in the lower surface of top plate 12
Rock-wool heat insulation plate can be selected in warm layer 20, heat-insulation layer 20, and rock-wool heat insulation plate uses integral plate as far as possible, to ensure optimal insulation work(
Can, as shown in Figure 3.As shown in figure 4, difference of the present invention according to the material of cell body 11, selectivity are set two layers in the side of cell body 11
Reinforcement 13, prevent the lateral pressure after contaminated soil entrance from destroying trough body structure.As shown in figure 5, use the device in batch
In the case of, to ensure the mobile flexibility of device, in the bottom of cell body 11 installation slot type guide rail 14, can be easy to device arrangement and
To slide, unit scaleization of the invention uses as shown in Figure 10, in Figure 10 in addition to first container, the thermocouple of remaining container
30th, heating rod 40 and temperature controller 50 are not shown.As a kind of embodiment, the size of container 10 of the invention be 150cm × 150cm ×
150cm, the thickness of rock-wool heat insulation plate is 10cm-30cm, and the preferably thickness of rock-wool heat insulation plate is 15cm, is lined with the appearance of warming plate
Device inner space need to ensure that jumbo bag bales stained soil is put into completely.The height that two layers of reinforcement 13 is set is 50cm and 100cm,
Two long tank type guide rails 14 are arranged on the centre position of the bottom of cell body 11, and the width of slot type guide rail 14 is 5cm and two long tank type guide rails
14 spacing is 100cm.
As shown in Figure 6,7, the present invention drills on top plate 12, for installing the temperature monitoring and heating unit of contaminated soil
Part, temperature-monitoring element are thermocouple 30, preferably fixed K-type thermocouple；Heating element heater is heating rod 40, preferably low-temperature heat
Rod.Thermocouple 30 and heating rod 40 are connected by temperature controller 50, specifically：The heat of all access temperature controllers 50 in parallel of thermocouple 30
On galvanic couple line 51, the power end 52 of all access temperature controllers 50 in parallel of heating rod 40, as shown in Figure 8.The temperature controller 50 of the present invention
Purpose digital temperature controller or electronic temperature controller can be selected, temperature controller 50 is used for temperature monitoring and heats the control of start and stop, temperature controller
50 set start-up temperature as 27 DEG C, and it is 30 DEG C to stop temperature.As a kind of embodiment, in order to coordinate the size of container 10, such as Fig. 6
Shown, thermocouple 30 of the invention is up to 5 in the outfit of each top plate, and heating rod 40 is up in the outfit of each top plate
16；The quantity of thermocouple 30 and heating rod 40 can take the circumstances into consideration to delete according to project situation；As shown in fig. 7, thermocouple 30 is from top plate
The length that heat-insulation layer extends downwardly from is 81cm, and the length that heating rod 40 extends downwardly from from top plate heat-insulation layer is 91cm, thermocouple 30
The length extended downwardly from heating rod 40 can be taken the circumstances into consideration to adjust according to project situation.
The present invention is in use, first by the microbial bacterial agent and micro- life of hexavalent chromium polluted soil and repairing hexavalent chromium polluted soil
Nutritive salt needed for thing growth is placed in jumbo bag or ton bucket after stirring, and is then lifted jumbo bag or ton bucket to cell body 11, is covered
Upper plate 12；The power supply of thermocouple 30, heating rod 40 and temperature controller 50 is connected, checks three's working condition, can after confirmation is errorless
Into microorganism remediation state, without other operations；During reparation, the temperature of the real-time monitoring pollution soil of thermocouple 30,
When startup critical value (27 DEG C) of the temperature less than setting, temperature controller 50 controls heating rod 40 to work, when temperature reaches setting
When stopping critical value (30 DEG C), temperature controller 50 controls heating rod 40 to be stopped, and can ensure optimal micro- life by said structure
Thing repairing condition；The device is 2-4 months per the batch cycle of operation, and after the completion of reparation, jumbo bag or ton bucket are hung out.
During microorganism remediation contaminated soil, sampling detects the repairing effect of microorganism, and according to repairing effect
Carry out the supplement of microbial bacterial agent and nutritive salt.The thrust-type injection device of the present invention is with being mended when necessary in contaminated soil
Fill the device of nutritive salt needed for microbial bacterial agent and microorganism growth, the optional part as the present apparatus.
As shown in figure 9, the thrust-type injection device 60 of the present invention includes membrane pump 61, air compressor machine 62, medicament barrel 63, medicament
Pipeline 64, thrust-type injection needle 65, pressure gauge 66 and flowmeter 67, the air inlet of membrane pump 61 are connected with air compressor machine 62, barrier film
The charging aperture of pump 61 is connected with medicament barrel 63, and the discharging opening of membrane pump 61 passes through pharmaceutical pipeline 64 and the phase of thrust-type injection needle 65
Even, pressure gauge 66 and flowmeter 67 are installed on pharmaceutical pipeline 64.Wherein, thrust-type injection needle 65 is tip and tube wall carries circle
The hollow hard structure in hole, acid and alkali-resistance or corrosion-resistant structure may be selected according to the property of injection medicament, general material suggests carbon steel
Or 304 stainless steels, tube wall percent opening need to reach 9-12%；Pharmaceutical pipeline 64 is nylon inner lining plastic tube, and caliber connects with injection needle
Mouth and membrane pump discharging opening are supporting；Pressure gauge and flowmeter are installed on the medicine between thrust-type injection needle 65 and membrane pump 61
On agent pipeline 64, for monitoring liquid injection pressure and flow；Medicament barrel 63 is PE the or PVC medicament barrels with agitating device.
In use, thrust-type injection needle 65 is inserted in contaminated soil through the pre- preset hole on top plate 12, start air compressor machine 62, pneumatics
Microbial bacterial agent in medicament barrel 63 and nutritive salt are transported at thrust-type injection needle 65 by machine 62, and through thrust-type injection needle 65
It is supplemented in contaminated soil.
The present invention is a kind of sustainable restorative procedure of green, and by the introducing of microorganism remediation, chemistry is greatly lowered
The addition of medicament, and largely improve soil ecology function, accomplish appropriate reparation, science reparation；The reparation dress of the present invention
Put can on a large scale, the environment of the offer microorganism remediation contaminated soil of high quality, mobility is strong, and flexibility ratio is high, automates journey
Degree is high, can increase substantially remediation efficiency.
The preferred embodiments of the present invention are these are only, are not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. one kind is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism, it is characterised in that including：
The Analysis on Pollution Characteristics of step 1, hexavalent chromium polluted soil, the Analysis on Pollution Characteristics include the test of hexavalent chromium concentration；
Step 2, pretreatment, the pretreatment include the test and regulation of contaminated soil particle diameter, acid-base value and moisture content；
Step 3, it is placed in after contaminated soil, microbial bacterial agent and nutritive salt are stirred in prosthetic device and carries out microorganism and repair
It is multiple.
2. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 1, it is characterised in that in step
In 2, pretreated contaminated soil particle diameter≤5cm, acid-base value 5-8, moisture content 20%-30%.
3. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 1, it is characterised in that in step
In 3, the microbial bacterial agent is sulfate reducing bacteria, the nutritive salt include organic fertilizer and one kind in glucose, methanol or
It is a variety of.
4. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 3, it is characterised in that the battalion
The mass fraction for supporting organic fertilizer in salt is 1-2%, and the mass fraction of glucose is 1-2%, and the mass fraction of methanol is 0.5-
1%, the mass fraction ＞ 30% of organic matter in organic fertilizer.
5. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 1, it is characterised in that in step
In 3, the condition of the microorganism remediation is：Hexavalent chromium concentration≤500mg/kg of contaminated soil, acid-base value 8-9, moisture content
For 60%-70%, temperature is 27 DEG C -30 DEG C.
6. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 5, it is characterised in that work as pollution
During the hexavalent chromium concentration ＞ 500mg/kg of soil, carry out electronation before microorganism remediation, the electronation including the use of
Chemical reducing agent carries out hexavalent chrome reduction to contaminated soil, and the hexavalent chromium concentration of contaminated soil is adjusted to≤500mg/kg.
7. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 6, it is characterised in that describedization
Learn one kind in reducing agent ferrous sulfate, sodium pyrosulfite, calcium polysulfide and iron powder.
8. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 1, it is characterised in that described to repair
Apparatus for coating includes：Accommodate the container of contaminated soil；
The container includes cell body and top plate, and the inner surface of the cell body and top plate is equipped with heat-insulation layer；
Multiple thermocouples for the monitoring pollution soil moisture are laid with the top plate and multiple for heating contaminated soil
Heating rod, on the thermocouple wire of all parallel thermocouples access temperature controllers, all heating rods access temperature controls in parallel
The power end of device.
9. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 8, it is characterised in that described to repair
Apparatus for coating also includes：For supplementing the thrust-type injection device of microbial bacterial agent and nutritive salt into contaminated soil；
The thrust-type injection device includes membrane pump, and the air inlet of the membrane pump is connected with air compressor machine, the membrane pump
Charging aperture is connected with medicament barrel, and the discharging opening of the membrane pump is connected by pharmaceutical pipeline with thrust-type injection needle；
The thrust-type injection needle is tip and tube wall sets round-meshed hollow hard structure, the tube wall of the thrust-type injection needle
Percent opening is 9-12%, and pressure gauge and flowmeter are provided with the pharmaceutical pipeline.
10. it is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism as claimed in claim 8, it is characterised in that described
The side of cell body is provided with reinforcement, and the bottom of the cell body is provided with slot type guide rail；The heat-insulation layer is rock-wool heat insulation plate, institute
It is fixed K-type thermocouple to state thermocouple, and the heating rod is low-temperature heat rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710696166.5A CN107486468A (en) | 2017-08-15 | 2017-08-15 | One kind is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710696166.5A CN107486468A (en) | 2017-08-15 | 2017-08-15 | One kind is used for hexavalent chromium polluted soil heterotopic repairing method of microorganism |
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| Publication Number | Publication Date |
|---|---|
| CN107486468A true CN107486468A (en) | 2017-12-19 |
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Application publication date: 20171219 |