CN106623389A - Remediation method for cyanide contaminated soil - Google Patents
Remediation method for cyanide contaminated soil Download PDFInfo
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- CN106623389A CN106623389A CN201611110067.6A CN201611110067A CN106623389A CN 106623389 A CN106623389 A CN 106623389A CN 201611110067 A CN201611110067 A CN 201611110067A CN 106623389 A CN106623389 A CN 106623389A
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- Prior art keywords
- soil
- heap
- toxic substances
- removing toxic
- head tank
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
Abstract
The invention discloses a remediation method for cyanide contaminated soil. The remediation method includes the steps that 1, a pile construction site is finished as a slope surface, and an anti-seepage bottom pad is laid; 2, a pile is built and a dripping pipe is laid; 3, a water collecting ditch, a waterproof weir, a clarification tank, a detoxification container, a sedimentation tank and a high-position water tank are arranged; 4, alkaline leaching solutions are prepared in the sedimentation tank and pumped into the high-position water tank, then permeate into the soil pile through the dripping pipe and carry out leaching; 5, after the leaching solutions permeate into the soil to be treated, the leaching solutions flow into the water collecting ditch and the clarification tank from the bottom of the soil pile and then are pumped into the detoxification container, detoxification chemicals are scattered into the detoxification container and are treated under the stirring condition, treated liquid flows into the sedimentation tank, and clear liquid is pumped into the high-position water tank and used as the leaching solutions; and 6, the step 5 is executed repeatedly, and when the soil to be treated meets the treatment requirements, the soil is continuously leached by new water for 1-2 days, and then the pile is removed. The remediation method for the cyanide contaminated soil can effectively improve the infiltration effect in the soil pile and is good in economical efficiency, large in treating scale, short in time and free of secondary pollution.
Description
Technical field
The present invention relates to technical field of soil remediation, more particularly to a kind of cyanide polluted soil restorative procedure.
Background technology
What on April 17th, 2014 announced《National Soil Pollution Investigation publication》, national soil environment situation is totally not
Hold optimism, industry and mining discarded ground soil environment problem is especially projected.With the appearance of " ten, soil ", contaminated soil administers reparation will
New industry is increasingly becoming, but the research and development and application of contaminated soil remediation technology are also in experimental stage mostly, really can industry
Using technology it is little.
Domestic existing recovery technique containing cyanide polluted soil at present mainly includes luminescence method, phytoremediation, biology
Repairing method, direct chemical oxidization method and incineration method.Consider from economy and environmental friendliness angle, luminescence method, phytoremediation and life
Thing repairing method be can yet be regarded as good processing method, but from ageing consideration, above-mentioned several method process cycle is longer, especially pin
To soil containing cyanide, air is entered because cyanide can slowly decompose under middle sour environment, and cyanide is soluble in water,
Migration velocity is fast in soil, therefore above-mentioned three kinds of methods are not suitable for adopting in the extensive harnessing project containing cyanide polluted soil
With.Directly chemical oxidization method and incineration method are respectively provided with the advantages of process time is short, treatment effeciency is high, but incinerate method processing cost
Height, soil texture destruction is serious after process, is unfavorable for that soil is comprehensively utilized, and direct chemical oxidization method needs to carry out water and soil separation,
But general water and soil separation is highly difficult, and water and soil separation equipment is limited in one's ability.
Existing original position soil drip washing at present to be referred to and apply eluent to soil by injector well etc. so as to infiltration downwards,
Combined with pollutant through contaminated zone, finally become transportable state compound.The technology needs to build reparation in situ and sets
Apply, including cleaning fluid dosing system, soil lower floor leachates collection system and leachates processing system.The technology for homogeneous,
Pollutant has higher separation and removal efficiency in permeable soil.Have the disadvantage：May polluted underground water, it is impossible to removing
Effect is predicted with lasting repair time, and removal effect is limited by place geological condition etc..
Current existing dystopy Soil leaching is referred to excavates contaminated soil, by the component of screening removal super large simultaneously
Soil is divided into coarse fodder and fines, then is mechanically suspended by hydraulics mode or is stirred soil particle, soil particle size
Minimum lower limit is 9.5mm, just can be easier to be washed away pollutant from soil by which more than the chad and particle of this size.
When contaminated soil sand grains and gravel concentration are more than 50%, dystopy Soil leaching technology will be largely effective.And for clay,
Silt content is more than 30%～50%, or the contaminated soil that humus content is higher, and dystopy Soil leaching technology is separated and removed
Effect is poor.
The content of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of cyanide polluted soil restorative procedure, is effectively improved soil
Percolation effect in earth heap, good economy performance, treatment scale are big, the time is short, do not produce secondary pollution.
For this purpose, technical scheme is as follows：
A kind of cyanide polluted soil restorative procedure, comprises the steps：
1) heap place is built in finishing, it is ensured that place is domatic, re-lays antiseepage heelpiece；
2) pending soil layering is built into heap and obtains soil heap, in soil heap upper surface or soil heap upper surface and interior part
Layer laying drop shower pipe；
3) heap place horizontal line lowest side setting charge for remittance ditch is being built, other sides arrange cofferdams, meanwhile, build heap place week
While being provided with depositing reservoir, removing toxic substances container and sedimentation basin, the depositing reservoir is communicated with the charge for remittance ditch；It is provided with the removing toxic substances container
Agitator；The depositing reservoir is communicated with removing toxic substances container by pumping installations；The pumping installations is used in the depositing reservoir
Liquid pumps into removing toxic substances container；The delivery port of the removing toxic substances container is communicated with the sedimentation basin；Water head tank is set, and it is highly higher than
The height of soil heap；The water head tank is communicated by the first pumping installations with sedimentation basin；
4) alkaline leacheate is prepared in the sedimentation basin, alkaline leacheate is pumped into by high-order water by the first pumping installations
Groove；Alkaline leacheate is responsible for the multiple branch line I arranged on I, on branch line I by the supervisor I being connected with water head tank
The drop shower pipe of installation, penetrates into soil heap, and to pending soil drip washing is carried out；
It is preferred that, the alkaline leacheate is any one in quick lime, white lime, NaOH and potassium hydroxide or appoints
Several mixtures with any ratio of meaning；
5) leacheate is penetrated into after pending soil, from soil heap bottom from inflow charge for remittance ditch, then from charge for remittance ditch from inflow
Depositing reservoir, clear liquid pumps into removing toxic substances container in depositing reservoir, is sprinkled into removing toxic substances medicament, and concentration of cyanide is reduced under agitation；Then
Liquid after processing in removing toxic substances container is flowed into into sedimentation basin, clear liquid pumps into water head tank, uses as leacheate；
6) circulation step 5), when pending soil reaches processing requirement, water is pumped in water head tank, drip washing is continued to soil
1～2 day, remove heap.
Further, the removing toxic substances medicament is according to the mass fraction：2～6 parts of lime, 1～3 part of highly basic, persulfate 2～
6 parts, and 4～8 parts of hypochlorite, it is preferable that the lime is the mixture of white lime, quick lime or both；The highly basic is hydrogen
Sodium oxide molybdena, potassium hydroxide, or both mixture.
It is preferred that, the persulfate is any one in sodium peroxydisulfate, sulfuric acid acid potassium and ammonium persulfate or arbitrarily several
With the mixture of any ratio；
It is further preferred that the hypochlorite is any one in calcium hypochlorite, postassium hypochlorite and sodium hypochlorite or arbitrarily several
Plant with the mixture of any ratio.
Further, step 2) in when building heap soil heap, multiple husky wells are also vertically embedded with soil heap, the husky well is
Inside filling gravel, the pipe of side wall punching；Supervisor II, the multiple branch lines on the supervisor II are led to from water head tank
The delivery port of II, the branch line II is located at the surface of the husky well；Meanwhile, step 4) neutral and alkali leacheate also by master
Pipe II, branch line II, the husky well of entrance, so as to penetrate into soil heap.
Further, the antiseepage heelpiece is HDPE or PVC antiseepage films, it is preferable that the antiseepage heelpiece in HDPE antiseepage films or
Also it is equipped with coarse sands layer, sack piece on PVC antiseepage films successively.
It is preferred that, the installation site of the water head tank can guarantee that the pressure supplied water to the soil heap upper surface be 0.4～
0.5MPa。
It is preferred that, the height of the soil heap is 1.5～4m.
The processing system that the cyanide polluted soil restorative procedure that the present invention is provided is used is that cyanide polluted soil is different
Position elution circuit, including mound system, elution circuit and processing system,
The mound system includes charge for remittance ditch, ground, the antiseepage heelpiece being arranged on ground, is arranged at the antiseepage heelpiece
On soil heap and cofferdam；It is 5～8 ° that the ground is domatic, the preferably domatic gradient；The charge for remittance ditch is arranged at described
The minimum side in soil heap bottom surface, meanwhile, the cofferdam is arranged at other three side of the soil heap；
The processing system includes depositing reservoir, removing toxic substances container and sedimentation basin；The depositing reservoir is communicated with the charge for remittance ditch；Institute
State in removing toxic substances container and be provided with agitator；The depositing reservoir is communicated with removing toxic substances container by pumping installations；The pumping installations is used for
Liquid in the depositing reservoir is pumped into into removing toxic substances container；The delivery port of the removing toxic substances container is communicated with the sedimentation basin；
The elution circuit includes water head tank and spray system；The water head tank by the first pumping installations with it is described
Sedimentation basin is communicated；First pumping installations is used to for the supernatant in the sedimentation basin to pump into the water head tank；The height
Height of the installation site of position tank higher than the soil heap；The spray system includes the supervisor being connected with the water head tank
I, the multiple branch line I being arranged on the supervisor I, and drop shower pipe composition, the drop shower pipe are installed on the branch line I
On be additionally provided with drip head；The drop shower pipe is laid in the upper surface of the soil heap, and preferably each drop shower pipe be arranged in parallel.It is more excellent
Choosing, the drop shower pipe is not only arranged at the upper surface of the soil heap and is also embedded in inside the soil heap.
Depositing reservoir, sedimentation basin can arrange multiple according to situation.
Further, the cyanide polluted soil dystopy elution circuit also includes husky well filtration system；The husky well diafiltration
System includes the supervisor II being connected with the water head tank, the multiple branch line II being arranged on the supervisor II, and vertically
The husky well being embedded in the soil heap；The delivery port of the branch line II is located at the surface of the husky well；The husky well
For internal filling gravel, the pipe of side wall punching.
Further, the soil heap surface area water position is additionally provided with Sha Jing, and the husky well is internal filling gravel, side wall
The pipe of punching.
Further, the antiseepage heelpiece is HDPE or PVC antiseepage films, it is preferable that the antiseepage heelpiece in HDPE antiseepage films or
Also it is equipped with coarse sands layer, sack piece on PVC antiseepage films successively.
It is preferred that, the installation site of the water head tank can guarantee that the pressure supplied water to the soil heap upper surface be 0.4～
0.5MPa。
It is preferred that, the height of the soil heap is 1.5～4m.
The technological process has following features：1) heap-drip washing-waste water detoxification technique is built creatively by ore-dressing technique application
In environmental pollution improvement, compared to technologies such as incineration methods, the technique has treatment scale bigger, and the time is shorter, economy
More preferably, the convenient advantage of organizing construction；2) heelpiece has been laid in processing procedure containing cyanide polluted soil and has prevented and treated seepage, and it is first
It is rinsed with alkaline water, harmful substance that can be in sweetening of the soil prevents from releasing the hypertoxic gas such as hydrogen cyanide, it is to avoid cause two
Secondary pollution；3) soil property after processing is not destroyed, and can be comprehensively utilized.On the one hand can be by the soil after process
Backfill after being dried, on the other hand can also use for reference " mound design park " pattern, carry out planting technique and beautify the environment, while also can
Further purification soil.4) current China is widely present industrial and mining enterprises' waste pollution governing problem, and the technique is to processing containing weight
Metal, organic material contaminated soil equally have effect, have broad application prospects in the future, it is contemplated that economic benefit it is very aobvious
Write.
Description of the drawings
Fig. 1 is that cyanide polluted soil dystopy elution circuit used in the present invention is removed from water head tank extraction pipeline
Structural representation；
The action principle figure of the cyanide polluted soil restorative procedure that Fig. 2 is provided for invention；
Fig. 3 is the structural representation of antiseepage heelpiece.
Specific embodiment
Technical scheme is described in detail below in conjunction with the drawings and specific embodiments.
The processing system that the cyanide polluted soil restorative procedure that the present invention is provided is used is that cyanide polluted soil is different
Position elution circuit, the composition of the system is as follows：
As shown in figure 1, a kind of cyanide polluted soil dystopy elution circuit, including mound system, elution circuit and process
System, mound system includes charge for remittance ditch 2, ground, the antiseepage heelpiece 11 being arranged on ground, the soil being arranged on antiseepage heelpiece 11
Earth heap 1 and cofferdam 7；It is 5～8 ° that ground is domatic, the preferably domatic gradient；It is minimum that charge for remittance ditch 2 is arranged at the bottom surface of soil heap 1
Side, meanwhile, cofferdam 7 is arranged at other three side of soil heap 1, for preventing the water oozed out from soil heap from just going out from side
Into underground, polluted underground water；Antiseepage heelpiece 11 is HDPE or PVC antiseepage films 113, it is preferable that antiseepage heelpiece 11 is in HDPE antiseepages
Also it is equipped with coarse sands layer 112, sack piece 111 on film or PVC antiseepage films successively；The height of soil heap 1 is 1.5～4m；Such as Fig. 3
It is shown；Processing system includes depositing reservoir 3, removing toxic substances container 4 and sedimentation basin 5；Depositing reservoir 3 is communicated with charge for remittance ditch 2；In removing toxic substances container 4
It is provided with agitator；Pumping installations is provided between depositing reservoir 3 and removing toxic substances container, pumping installations is used for the liquid pump in depositing reservoir 3
Enter to detoxify container 4；The delivery port of removing toxic substances container 4 is communicated with sedimentation basin 5；Elution circuit includes water head tank 6 and spray system 9；
Water head tank 6 is communicated by the first pumping installations with sedimentation basin 5；First pumping installations is used to pump into the supernatant in sedimentation basin
Water head tank 6；The installation site of water head tank 6 is higher than the height of soil heap 1, specifically, the installation site energy of water head tank 6
The pressure for ensureing water supply to the soil heap upper surface is 0.4～0.5MPa；Spray system 9 includes what is be connected with water head tank 6
Supervisor I, the multiple branch line I being arranged on supervisor I, and drop shower pipe composition is installed on branch line I, also set up in drop shower pipe
There is drip head；Drop shower pipe is laid in the upper surface of soil heap, and preferably each drop shower pipe be arranged in parallel.It is further preferred that drop shower pipe not only sets
It is placed in the upper surface of soil heap to be also embedded in inside soil heap 1.
It is preferred that, the surface area water position of soil heap 1 is additionally provided with Sha Jing 10, and Sha Jing 10 is internal filling gravel, the punching of side wall
Pipe.
Used as a preferred embodiment of the present invention, cyanide polluted soil dystopy elution circuit also includes husky well diafiltration
System 8；Husky well filtration system includes the supervisor II being connected with water head tank 6, the multiple branch line II being arranged on supervisor II,
With the husky well 10 being embedded vertically in soil heap；The delivery port of branch line II is located at the surface of husky well 10；Husky well 10 is interior
Portion's filling gravel, the pipe of side wall punching.
Embodiment 1
Contaminated soil contains cyanide polluted soil from PORT OF TIANJIN " 812 " explosion accident, and sample analysis show in soil
2.42～114.30mg/kg of total cyanogen content, soil pH value 8.85, moisture 19.3%.
The multinomial analysis result of the contaminated soil of table 1
Implementing specific targets is：Build heap scale 200m3；Heap length 45m, width 4.5m, the high 1.5m of heap；Spraying intensity 40-
60L/m2·h；Rinse Cycle 45 days；Wastewater treatment scale 200m3/d；Waste water treatment process：Carried out using the chemical agent of configuration
Oxidation removing toxic substances.Implementation steps are as follows：
1) heap place is built in finishing, and the place gradient is 6 °, re-lays HDPE antiseepage films；
2) pending soil layering is built into heap and obtains soil heap, in soil heap upper surface laying drop shower pipe；Build heap scale
200m3；Heap length 45m, width 4.5m, the high 1.5m of heap；
3) heap place horizontal line lowest side setting charge for remittance ditch is being built, other sides arrange cofferdams, meanwhile, build heap place week
While being provided with depositing reservoir, removing toxic substances container and sedimentation basin, depositing reservoir is communicated with charge for remittance ditch；Agitator is provided with removing toxic substances container；Clarification
Pond is communicated with removing toxic substances container by pumping installations；Pumping installations is used to for the liquid in depositing reservoir to pump into removing toxic substances container；Removing toxic substances is held
The delivery port of device is communicated with sedimentation basin；Water head tank is set, and it is highly higher than the height of soil heap；Water head tank passes through the first pump
Device is sent to communicate with sedimentation basin；
4) alkaline leacheate is prepared in sedimentation basin, alkaline leacheate is pumped into by water head tank by the first pumping installations；
Alkaline leacheate is responsible for the multiple branch line I arranged on I by the supervisor I being connected with water head tank, pacifies on branch line I
The drop shower pipe of dress, penetrates into soil heap, and drip washing, spraying intensity 40-60L/m are carried out to pending soil2·h；Rinse Cycle 45 days；
Alkaline leacheate is sodium hydrate aqueous solution；
5) leacheate is penetrated into after pending soil, from soil heap bottom from inflow charge for remittance ditch, then from charge for remittance ditch from inflow
Depositing reservoir, clear liquid pumps into removing toxic substances container in depositing reservoir, is sprinkled into removing toxic substances medicament, and concentration of cyanide is reduced under agitation；Then
Liquid after processing in removing toxic substances container is flowed into into sedimentation basin, clear liquid pumps into water head tank, uses as leacheate；Removing toxic substances medicament be
Component meter by weight：2 parts of quick lime, 3 parts of NaOH, 2 parts of sodium peroxydisulfate, 7 parts of calcium hypochlorite；
6) circulation step 5), it is high-order when pending soil reaches nation-building land used soil pollution risk screening standard
New water is pumped in tank, drip washing 1～2 day is continued to soil, remove heap.
Relevant test data is as follows：
Total cyanogen result is analyzed in the final different depth position soil sample of table 2
Cyanide Leaching toxicity data is analyzed in the final diverse location soil sample of table 3
Final water sample analysis result (mg/L) after the process of table 4
According to final acceptance sampling interpretation of result, following recovery technique index is reached：1) the total cyanogen content of all sample points is complete
Portion is up to standard, and mean value is 5.57mg/kg, reaches nation-building land used soil pollution risk screening standard house class standard for land use
Limits value less than 9.86mg/kg；2) soil total cyanogen Leaching is 0.017mg/L, reaches national underground standards of water quality
(GB14848-93) IV classes are less than 0.1mg/L limit values；3) total cyanogen mean value is 0.05mg/L in the waste water water sample after final process,
Reach national sewage comprehensive emission standard (GB8978-1996) to require less than 0.5mg/L；4) heavy metal in final waste water water sample,
COD, pH value are all within national integrated wastewater discharge primary standard limits value.
Embodiment 2
Contaminated soil includes cyanide polluted soil from Tianjin Chemical Plant region, and sample analysis show that total cyanogen contains in soil
40.2～88.60mg/kg of amount, soil pH value 7.85, moisture 21.5%.
The multinomial analysis result of the contaminated soil of table 5
| Element | CaO | K2O | MgO | Na2O | SiO2 | Fe2O3 | TiO2 |
| Content/% | 10.06 | 3.25 | 3.65 | 2.04 | 50.11 | 6.25 | 0.60 |
| Element | Al2O3 | Cu | Pb | Zn | Cr | Carbon | Organic carbon |
| Content/% | 13.40 | 0.004 | 0.002 | 0.010 | 0.007 | 2.13 | 0.90 |
| Element | Cl- | Cd | Ba | As | P | Hg | S |
| Content/% | 0.8108 | 0.000017 | 0.0465 | 0.00131 | 0.078 | <0.001 | 0.17 |
Implementing specific targets is：Build heap scale 500m3；Heap length 40m, width 5m, the high 2.7m of heap；Spraying intensity 50-
75L/m2·h；Φ 50cm are buried in the range of the rice diameter of heap face 3,2.5 meters of height, PVC materials infiltration husky well casing sets on tube wall
Put the permeable circular ports of Φ 1.0cm, two Hole center distances 5cm, filling gravel in the husky well casing of infiltration；Rinse Cycle 72 days；At waste water
Reason scale 240m3/d；
Process step is as follows：
1) heap place is built in finishing, and the place gradient is 7 °, re-lays PVC antiseepage films, and thereon coarse sands layer, sack are laid respectively by portion
Piece；
2) pending soil layering is built into heap and obtains soil heap, build every high 1m during heap, lay one layer of drop shower pipe, built heap and complete
Afterwards, in soil heap upper surface laying drop shower pipe；Build heap scale 500m3；Heap length 40m, width 5m, the high 2.7m of heap；
Multiple husky wells (Φ 50cm, 2.5 meters of height), Sha Jingwei inside filling gravel, side wall are vertically embedded with soil heap
The pvc pipe of punching (aperture 1.0cm, two pitchs of holes 5cm)；Supervisor II, the multiple branches being responsible on II are led to from water head tank
The delivery port of pipeline II, branch line II is located at the surface of husky well；
3) heap place horizontal line lowest side setting charge for remittance ditch is being built, other sides arrange cofferdams, meanwhile, build heap place week
While being provided with depositing reservoir, removing toxic substances container and sedimentation basin, depositing reservoir is communicated with charge for remittance ditch；Agitator is provided with removing toxic substances container；Clarification
Pond is communicated with removing toxic substances container by pumping installations；Pumping installations is used to for the liquid in depositing reservoir to pump into removing toxic substances container；Removing toxic substances is held
The delivery port of device is communicated with sedimentation basin；Water head tank is set, and it is highly higher than the height of soil heap；Water head tank passes through the first pump
Device is sent to communicate with sedimentation basin；
4) alkaline leacheate is prepared in sedimentation basin, alkaline leacheate is pumped into by water head tank by the first pumping installations；
Alkaline leacheate is responsible for the multiple branch line I arranged on I by the supervisor I being connected with water head tank, pacifies on branch line I
The drop shower pipe of dress, penetrates into soil heap, meanwhile, alkaline leacheate is also by supervisor II, branch line II, into husky well, so as to ooze
Enter soil heap, drip washing, spraying intensity 50-75L/m are carried out to pending soil2·h；Rinse Cycle 72 days；Alkaline leacheate is
Potassium hydroxide aqueous solution；
5) leacheate is penetrated into after pending soil, from soil heap bottom from inflow charge for remittance ditch, then from charge for remittance ditch from inflow
Depositing reservoir, clear liquid pumps into removing toxic substances container in depositing reservoir, is sprinkled into removing toxic substances medicament, and concentration of cyanide is reduced under agitation；Then
Liquid after processing in removing toxic substances container is flowed into into sedimentation basin, clear liquid pumps into water head tank, uses as leacheate；Removing toxic substances medicament be
Component meter by weight：1 part of quick lime, 2 parts of NaOH, 3 parts of sodium peroxydisulfate, 5 parts of calcium hypochlorite；
6) circulation step 5), it is high-order when pending soil reaches nation-building land used soil pollution risk screening standard
New water is pumped in tank, drip washing 1 day is continued to soil, remove heap.
Relevant test data is as follows：
Total cyanogen result is analyzed in the final different depth position soil sample of table 6
Cyanide Leaching toxicity data is analyzed in the final diverse location soil sample of table 7
Final water sample analysis result (mg/L) after the process of table 8
According to final acceptance sampling interpretation of result, following recovery technique index is reached：1) the total cyanogen content of all sample points is complete
Portion is up to standard, and mean value is 4.63mg/kg, reaches nation-building land used soil pollution risk screening standard house class standard for land use
Limits value less than 9.86mg/kg；2) soil total cyanogen Leaching is 0.057mg/L, reaches national underground standards of water quality
(GB14848-93) IV classes are less than 0.1mg/L limit values；3) total cyanogen mean value is 0.027mg/ in the waste water water sample after final process
L, reaches national sewage comprehensive emission standard (GB8978-1996) and requires less than 0.5mg/L；4) huge sum of money in final waste water water sample
Category, COD, pH value are all within national integrated wastewater discharge primary standard limits value.
Claims (10)
1. a kind of cyanide polluted soil restorative procedure, it is characterised in that comprise the steps：
1) heap place is built in finishing, it is ensured that place is domatic, re-lays antiseepage heelpiece；
2) pending soil layering is built into heap and obtains soil heap, in soil heap upper surface or soil heap upper surface and interior laminate layer paving
If drop shower pipe；
3) heap place horizontal line lowest side setting charge for remittance ditch is being built, other sides arrange cofferdams, meanwhile, build heap place periphery and set
Depositing reservoir, removing toxic substances container and sedimentation basin are equipped with, the depositing reservoir is communicated with the charge for remittance ditch；Stirring is provided with the removing toxic substances container
Device；The depositing reservoir is communicated with removing toxic substances container by pumping installations；The pumping installations is used for the liquid in the depositing reservoir
Pump into removing toxic substances container；The delivery port of the removing toxic substances container is communicated with the sedimentation basin；Water head tank is set, and it is highly higher than soil
The height of heap；The water head tank is communicated by the first pumping installations with sedimentation basin；
4) alkaline leacheate is prepared in the sedimentation basin, alkaline leacheate is pumped into by water head tank by the first pumping installations；
Alkaline leacheate is responsible for the multiple branch line I arranged on I by the supervisor I being connected with water head tank, pacifies on branch line I
The drop shower pipe of dress, penetrates into soil heap, and to pending soil drip washing is carried out；
5) leacheate is penetrated into after pending soil, from soil heap bottom from inflow charge for remittance ditch, then from charge for remittance ditch from inflow clarification
Pond, clear liquid pumps into removing toxic substances container in depositing reservoir, is sprinkled into removing toxic substances medicament, and concentration of cyanide is reduced under agitation；Then will solution
Liquid after processing in malicious container flows into sedimentation basin, and clear liquid pumps into water head tank, uses as leacheate；
6) circulation step 5), when pending soil reaches processing requirement, water is pumped in water head tank, drip washing 1～2 is continued to soil
My god, remove heap.
2. cyanide polluted soil restorative procedure as claimed in claim 1, it is characterised in that：Step 2) in when building heap soil heap,
Multiple husky wells are also vertically embedded with soil heap, the husky well is internal filling gravel, the pipe of side wall punching；From water head tank
Supervisor II is led to, the delivery port of the multiple branch line II on the supervisor II, the branch line II is located at the husky well
Surface；Meanwhile, step 4) neutral and alkali leacheate also by supervisor II, branch line II, husky well is entered, so as to penetrate into soil
Heap.
3. cyanide polluted soil restorative procedure as claimed in claim 1 or 2, it is characterised in that：The removing toxic substances medicament is by matter
Amount number meter：2～6 parts of lime, 1～3 part of highly basic, 2～6 parts of persulfate, and 4～8 parts of hypochlorite；
It is preferred that, the persulfate is any one in sodium peroxydisulfate, sulfuric acid acid potassium and ammonium persulfate or arbitrarily several to appoint
The mixture of meaning ratio；
It is further preferred that the hypochlorite be any one in calcium hypochlorite, postassium hypochlorite and sodium hypochlorite or it is arbitrarily several with
The mixture of any ratio.
4. cyanide polluted soil restorative procedure as claimed in claim 3, it is characterised in that：The lime is white lime, raw stone
The mixture of ash or both；The highly basic be NaOH, potassium hydroxide, or both mixture.
5. cyanide polluted soil restorative procedure as claimed in claim 1 or 2, it is characterised in that：The alkaline leacheate is made a living
Any one in lime, white lime, NaOH and potassium hydroxide or any several mixtures with any ratio.
6. cyanide polluted soil restorative procedure as claimed in claim 1 or 2, it is characterised in that：The antiseepage heelpiece is HDPE
Or PVC antiseepage films.
7. cyanide polluted soil restorative procedure as claimed in claim 1 or 2, it is characterised in that：The antiseepage heelpiece is in HDPE
Also it is equipped with coarse sands layer, sack piece on antiseepage film or PVC antiseepage films successively.
8. cyanide polluted soil restorative procedure as claimed in claim 1 or 2, it is characterised in that：The installation of the water head tank
Position can guarantee that the pressure of water supply to the soil heap upper surface is 0.4～0.5MPa.
9. cyanide polluted soil restorative procedure as claimed in claim 1 or 2, it is characterised in that：The height of the soil heap is
1.5～4m.
10. cyanide polluted soil restorative procedure as claimed in claim 1 or 2, it is characterised in that：It is described that to build heap place domatic
The gradient is 5～8 °.
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| CN201611110067.6A CN106623389A (en) | 2016-12-06 | 2016-12-06 | Remediation method for cyanide contaminated soil |
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ID=58818652
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| CN107309262A (en) * | 2017-08-11 | 2017-11-03 | 重庆大学 | A kind of method that aqueous slkali phase transfer of technology repairs cyanide polluted soil |
| CN108405599A (en) * | 2018-03-27 | 2018-08-17 | 中交天航环保工程有限公司 | One heavy metal species and cyanide polluted composite soil repairing method |
| CN108746175A (en) * | 2018-07-30 | 2018-11-06 | 天津华勘环保科技有限公司 | Dump leaching-ozone cooperative decyanation technology and processing system |
| CN108787726A (en) * | 2018-08-29 | 2018-11-13 | 北京高能时代环境技术股份有限公司 | A kind of technique that chemical leaching and electronation repairing polluted soil is used in combination |
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| CN109396167A (en) * | 2018-12-06 | 2019-03-01 | 天津华勘环保科技有限公司 | One kind soil repair system containing cyanogen and restorative procedure |
| CN110369478A (en) * | 2018-04-13 | 2019-10-25 | 陈淡宁 | The method for comprehensive repairing of heavy-metal contaminated soil |
| CN110523758A (en) * | 2019-09-09 | 2019-12-03 | 上海环境绿色生态修复科技有限公司 | A kind of contaminated soil builds heap cycling elution prosthetic device and method |
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