CN108637003A - A kind of regulation method based on 20 meters or less backfill pollutions of chromium - Google Patents
A kind of regulation method based on 20 meters or less backfill pollutions of chromium Download PDFInfo
- Publication number
- CN108637003A CN108637003A CN201810401000.0A CN201810401000A CN108637003A CN 108637003 A CN108637003 A CN 108637003A CN 201810401000 A CN201810401000 A CN 201810401000A CN 108637003 A CN108637003 A CN 108637003A
- Authority
- CN
- China
- Prior art keywords
- medicament
- well
- chromium
- meters
- pollutions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to technical field of soil remediation, specifically disclose a kind of regulation method based on 20 meters or less backfill pollutions of chromium, include the following steps：Step 1：In-site measurement is carried out, determines repair coverage and side's amount；Step 2：Smooth location is built and faces construction and apply, while doing slope retaining and work is built in gutter；Step 3：Build shallow-layer backwater monitoring well；Step 4：Determine injector well installation location；Step 5：Injector well is built, medicament configuration is carried out at the same time；Step 6：Injector well carries out medicament injection according to a certain percentage, is stripped to the waste water of generation, handles simultaneously reuse；Step 7：Medicament is conserved 35 days, is carried out from examination.The present invention reasonably arranges injector well, ensures that each region within the scope of injector well medicament is injected, avoids that ground soil is caused not have the case where being repaired because being not affected by pharmacy effect.
Description
Technical field
The present invention relates to technical field of soil remediation, more particularly to a kind of whole based on 20 meters or less backfill pollutions of chromium
Control method.
Background technology
Currently, domestic, foreign countries is combined to administer recovery project development condition for contaminated soil, administers repair and mainly divide
For " in-situ immobilization mode ", " showering mode " two ways.It is specific as follows：
1, in-situ immobilization mode
Advantage：Contaminated soil is not moved, and original place reparation or place directly are carried out to it in the position that place is polluted
The soil restoring technology of reason.It is low with investing, surrounding enviroment are influenced small
Weak tendency：Higher for factors dictates such as Geological conditions, process monitoring difficulty is relatively large
2, showering mode
Advantage：Contaminated soil is excavated from the position polluted, within the scope of former site or by transport
The technology administered again afterwards.The site remediation effect higher for pollution concentration, risk is larger is good, and process monitor, monitoring are difficult
It spends relatively small
Weak tendency：The cost is relatively high, relatively large to surrounding environment influence, easily causes pollution expanding, and by site condition
It is affected.
The form of chromium is divided into water-soluble state, exchange state, precipitation state, organically combine state and residual form, wherein residual form in soil
Chromium content is most, is secondly precipitation state chromium, organically combine state chromium.Cr VI be the property swallowed/imbedibility poisonous substance, can by digestion,
Respiratory tract, skin and mucous membrane invade human body.Skin contact may cause sensitivity, sucking can be carcinogenic, be more likely to cause heredity base
Because of defect, there is lasting danger to environment.Relevant report is endangered according to Cr VI, breathes the chromic acid containing various concentration in air
Different degrees of hoarse, Atrophic nasal mucosas are caused when acid anhydride, and perforation of nasal septum and bronchiectasis can be also made when serious.
It is directed in place to be administered and accumulates a large amount of building spoirs, i.e., the soil pollution caused by backfill, and place
Circumferential distribution has the situation of residential area, unspecial soil remediation technique to match, carried out according to showering mode
When reparation, the clear earthwork volume that digs is excessive, and needs cubic metre of earth and stone backfill, is compacted after the completion of repair, repairs fund
Demand is excessive, has consumed social resources excessively；The clear digging work for repairing borderline region is closed on, for the stabilization of high-rise residential building
Property, resident's safety effects are very big, even if being reinforced using engineering measure, feasibility is relatively low and potential security risk still very
Greatly.
Invention content
The technical problem to be solved in the present invention is to overcome the shortcomings of the prior art, provides a kind of based on 20 meters or less
The regulation method of backfill pollution of chromium.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：
A kind of regulation method based on 20 meters or less backfill pollutions of chromium, includes the following steps：
Step 1：In-site measurement is carried out, determines repair coverage and side's amount；
Step 2：Smooth location is built and faces construction and apply, while doing slope retaining and work is built in gutter；
Step 3：Build shallow-layer backwater monitoring well；
Step 4：Determine injector well installation location；
Step 5：Injector well is built, medicament configuration is carried out at the same time；
Step 6：Injector well carries out medicament injection according to a certain percentage, is stripped to the waste water of generation, handles simultaneously reuse；
Step 7：Medicament is conserved 3-5 days, is carried out from examination.
As a preferred embodiment, the step 4 includes the net that the injector well that the radius of influence is 2.5m is layouted according to rectangular 5m
The equilateral triangle mode that the injector well that lattice are layouted and/or the radius of influence is 1m is 1.8m according to the length of side is layouted.Injector well of the present invention
It layouts and layouts according to the grid of rectangular 5m, the area coverage of radius of influence R OI=2.5m, a well are about 19.63m2, in conjunction with
It is live practical, it avoids place and has pipeline position, injector well quantity is laid and calculated by theory；Injector well of the present invention, which is layouted, to be set
Meter injector well is layouted using quincunx (equilateral triangle) mode, radius of influence R OI=1m, well spacing 1.8m.
As a preferred embodiment, the injector well that the radius of influence is 2.5m carries out medicament note using the pouring-in technique of direct weighting
It penetrates, the injector well that the radius of influence is 1m carries out medicament injection using high-pressure rotary-spray technique.
As a preferred embodiment, the medicament in the step 5 includes reducing agent and stabilization agent, the reducing agent is mainly by more
Calcium sulfide, sulfide and calcium hydroxide composition, the stabilization agent is mainly by phosphate, tri-thiol triazine trisodium salt and a small amount of
Other elements form.The reducing agent and stabilization agent are encapsulated using heavy metal crystallization wrapper technology.
As a preferred embodiment, the reducing agent mainly by 13~16% calcium constituent, 40~50% element sulphur and 20~
30% carbon composition.
As a preferred embodiment, the stabilization agent mainly by 23~24% sodium element, 4~5% P elements, 33~
34% oxygen element, 19~20% element sulphur composition.
As a preferred embodiment, in the step 6, medicament injection process is：It is more first than the ratio not less than 0.3% according to adding
Reducing agent is added, then adds stabilization agent than the ratio not less than 0.3% according to adding；Preferably, the reducing agent is thrown
Add than being preferably 0.5%~1.5%, the stabilization agent is added than being preferably 0.5%~1.5%.
As a preferred embodiment, the waste water generated in the step 6 enters setting pot through extracting first, gravel is removed；Then
It is trivalent chromium by hexavalent chrome reduction after pH adjusts back pond and reduction reaction pond adds acid and reduction medicament；Finally in sedimentation basin
The pollutant of alkali and flocculant removal flocculation sediment is added, is discharged into clear water reserviors after sampled detection qualification and makees configuration medicament time
With.
As a preferred embodiment, built in step 2 face construction apply including：
1 sludge keeps in field, and floor space is 140~160m2, for storing up injector well probing extraction soil, wastewater treatment
The Polluted Soil of sludge, pile foundation generation that pond generates；
1 medicament configuration field, floor space are 45~55m2, for medicament dilution, stirring；
1 medicament stores up field, and floor space is 190~210m2。
Include the following steps as a preferred embodiment, building shallow-layer backwater monitoring well in the step 3：
Step 301：Drilling operation：Drilling tools are using detergent to be decontaminated, derusted using preceding, 4m or more soil layers
Drilled dry mode must be used, is used when rock section is crept into plus water drilling visits mode；
Step 302：Down tube：It is arranged in the following order from the downward monitoring well well casing of earth's surface：Wall casing, filter pipe, sediment tube,
It after drilling reaches design requirement, is first punched out before tripping in monitoring well well casing, changes slurry, punching drilling rod should be transferred to hole by when punching
Bottom will be rinsed fluid viscosity and 18~20s, density be reduced to be reduced to 1.1 with big pump amount punching deslagging after rock slag in hole is emptied
~1.15g/cm3；The monitoring well well casing internal diameter is not preferably less than 80mm, and water-bearing interval should install filter pipe, and anti-filter layer thickness is not
Less than 0.05m, when down tube, answers righting wall casing, ensures that wall casing is located at hole center, drainage length of tube should be equal to testing goal layer
Middle water-bearing layer overall thickness, the wall casing, filter pipe, sediment tube are connected through a screw thread, and final down tube Cheng Jinghou draw water washing
Well；
Step 303：Fill out gravel：Using graded quartz sand as filter layer filtrate, from bottom to top, sediment tube periphery diameter
It is filtered with filter layer the periphery of clay particle filling spherical and/or flat 0.6~1.2cm, filter pipe and upper part wall casing
Material tamps, and encloses the thickness for filling out filter layer filtrate not less than 50mm.
Step 304：Sealing, well-flushing, sealing of hole：Monitoring well well casing periphery is equipped with sealing layer, and the sealing layer is mainly by swelling
Local soil type is at the sealing layer thickness in monolayer is not preferably less than 5m and input clay ball is to subsurface 2m, after being closed to monitoring well immediately
Well-flushing is carried out, inspection is sampled to cleaning effect after well-flushing, is carried out once again if sampling inspection does not meet water standard
For well-flushing until reaching water standard, the water standard is that the water of monitoring well extraction is as clear as crystal and sand content mass ratio is less than 1/
200000 think well-flushing qualification；It is shunt in a well from subsurface 2m sealing layers to ground with cement using cementing after the completion of well-flushing.
Step 306：Build tree-protector：Monitor well head 0.5-1.0m above ground level, monitoring well head installation protection dress
It sets, the protective device includes the aperture cap of the pedestal and steel plate support of a concrete material, and the base height is not less than
70cm leaks out ground level 40-50cm, the susceptor diameter should be greater than aperture cap diameter wherein entering ground height is not less than 30cm
15cm-20cm, aperture cap thickness are not less than 10mm, height 30cm, and diameter is not less than 34cm.
Advantageous effect is：The present invention reasonably arranges injector well, ensures that model is injected in each region in injector well medicament
Within enclosing, avoid that ground soil is caused not have the case where being repaired because being not affected by pharmacy effect；Particularly, the present invention is to medicine
Further design has been done in agent, and the medicament used in the present invention is reducing agent and stabilization agent, and is calculated by many experiments
It adds ratio, and ratio is added using the medicament cooperation in the present invention is corresponding, can ensure after processing Cr in soil6+Total amount compared with
Low, soil remediation rate is high, while the medicament will not cause secondary pollution to soil, work well.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar reference numeral.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is that the pH-Eh of Cr (III) and Cr (VI) conversions schemes；
Fig. 2 is stratum form general model figure；
Fig. 3 is stratum form general model figure；
Fig. 4 is place water barrier figure；
Fig. 5 is place water barrier figure；
Fig. 6 is shallow-layer backwater runoff distribution map；
Fig. 7 is process flow chart；
Fig. 8 is purification tank for liquid waste layout；
Fig. 9 is injector well location map；
Figure 10 is injector well radius of influence figure；
Figure 11 is high-pressure rotary-spray injector well radius of influence figure；
Figure 12 is monitoring well layout；
Figure 13 is tree-protector vertical view；
Figure 14 is tree-protector side view；
In figure, 1 is wastewater collection pond, and 2 be setting pot, and 3 be reduction reaction pond, and 4 be pH regulating reservoirs, and 5 be precipitation reaction
Pond, 6 be clear water reserviors, and 7 be injector well, and 8 be high-pressure rotary-spray injector well, and 9 be pedestal, and 10 be aperture cap, and 11 be locked instrument, 12
It is well casing for aperture cap steel pipe, 13.
Specific implementation mode
Presently in connection with Figure of description, the present invention is described further.
Embodiment 1：
The present invention is restored using in-situ chemical to soil remediation and Stabilization Remediation Technology.Stabilization Remediation Technology refers to
The pollutant in soil is fixed up with method physically or chemically, or pollutant is converted to chemical property torpescence
Form, prevent it from processes such as migrating, spread in the environment, to reduce pollutant murder by poisoning degree recovery technique.Solidification/
Stabilization Remediation Technology is suitable for the nothings such as heavy metal classes, asbestos, radioactive substance, corrosive inorganic object, cyanide, arsenic compound
The organic compounds such as machine object and pesticide/herbicide, oil or multiring aromatic hydrocarbon, polychlorinated biphenyl and bioxin.The present invention
Include Cr VI mainly for ground characteristic contamination, Cr VI is a kind of special heavy metal contaminants, and the chromium for forming precipitation is dirty
It is not permanent secure to contaminate object, therefore, for hexavalent chromium polluted soil, needs to be first trivalent by hexavalent chrome reduction therein
Then chromium carries out stabilization processes again, reduce influence of the external environment to chromium form, so that the reparation of pollution of chromium is had steady in a long-term
Property.
In-situ chemical restores and stabilisation is the process of two sequences.It is reduction process first, it, will by adding reducing agent
Hexavalent chrome reduction in contaminated soil is trivalent chromium, and forms chromium hydroxide precipitation or ferrochrome mineral, reaches the shape of chromium pollutant
State changes.
In an oxidizing environment, soil pH<When 6.5, Cr (VI) exists in the form of bichromate, works as pH>When 6.5, Cr (VI)
Exist with chromate forms thereof, the two is all extremely toxic substance；Cr (III) (pH in acid condition<4.6) with Cr3+Form exists；
When pH is when between 4.6~13, Cr (III) is with Cr (OH)3Precipitation form exists；When in pH>Under 13 extreme condition, Cr
(III) existence form is Cr (OH)4-.As shown in Figure 1, Cr (VI) is generally present under Strong oxdiative environment, under the reducing conditions
Cr (VI) will be reduced to Cr (III) and be easy to form hydroxide precipitation.Therefore, the present invention using the method for reduction by Cr
(VI) Cr (III) is transformed into, to reach removal Cr (VI) pollutant, eliminates the reparation purpose of environmental risk.
Medicament of the present invention is mainly two kinds, is reducing agent and stabilization agent respectively.Wherein reducing agent mainly at
It is divided into inorganic sulfur (calcium polysulfide, sulfide), calcium hydroxide etc., reducing agent drug main component is as shown in table 1.Reducing agent physics and chemistry
Characteristic is：Form：Liquid.Color：Brown.Smell：There is a little pungent odour.Density：Relative density be 1.2 ± 0.1 (water=
1).Vapour pressure：It is not applicable.Flash-point：It is not applicable.Critical pressure：It is not applicable.Dissolubility：It is dissolved in water on a small quantity.Stability：It is unstable,
Avoid contact with air, wet environment and oxidizing substance.PH value：10~12.Active ingredient：29%~30%.Purposes：As place
Manage soil, slag and the sludge etc. of heavy metal chromium pollution.
It is trivalent chromium that reducing agent, which is by highly toxic hexavalent chrome reduction by reduction, and main function ingredient is lower valency
Sulphur reacts formula：
3S2-+2Cr6+→2Cr3++3S
Sulphur can be formed after reaction, and since sulphur is unstable, the lower sulfate radical of concentration can be ultimately become by series reaction
Ion, it is contemplated that the corrosion problems of sulfate ion, when researching and developing medicament, consider under the premise of meeting medicament validity,
It is added to a certain proportion of calcium constituent (13~16% are advisable) to be matched with medicament active ingredient, the calcium ion in medicament and soil
Heavy metal ion in earth will form sulfuric acid object precipitation with sulfate ion, greatly reduce the corrosivity of sulfate ion, right
Periphery water environment, soil environment and structure effect on building are smaller.
| Element | Content (%) |
| Calcium | 13~16 |
| Sodium | 2~3 |
| Hydrogen | 0.1~0.5 |
| Oxygen | 1~5 |
| Aluminium | 1~2 |
| Silicon | 5~10 |
| Iron | 0~0.5 |
| Sulphur | 40~50 |
| Carbon | 20~30 |
Table 1
Stabilization agent main component is phosphate, tri-thiol triazine trisodium salt and a small amount of other elements, is mainly formed
As shown in table 2.Its physicochemical property is：Form：Liquid.Color：It is colourless to faint yellow.Smell：Nothing.Density：Relative density about 1.1
(water=1).Vapour pressure：It is not applicable.Flash-point：It is not applicable.Critical pressure：It is not applicable.Dissolubility：It is dissolved in water.Stability：Stablize,
Avoid strong acid, strong oxidizer etc..Active ingredient：30%.PH value：>=10.5 purposes：As stabilization processes heavy metal lead, cadmium,
The contaminated soils such as zinc, copper, nickel, mercury, chromium, slag and bed mud etc..Possible hazardous decomposition products：Nothing.
Stabilization agent is to react (Me is heavy metal) formation with heavy metal by chelation group after reducing agent processing
The extremely difficult macromolecular solid chelate products for being dissolved in water, the macromolecular solid chelate products (chemical formula is as shown in Equation 1) of generation are in height
Property stabilization is not decomposed under the conditions of warm (250 DEG C), strong acid and strong base；With lower bio-toxicity, it is excessively used and has not will produce
Evil substance, will not cause secondary pollution to environment.
| Element | Content (%) |
| Sodium | 23~24 |
| Phosphorus | 4~5 |
| Hydrogen | 3~4 |
| Oxygen | 33~34 |
| Carbon | 7~8 |
| Nitrogen | 8~9 |
| Sulphur | 19~20 |
Table 2
Reducing agent and stabilization agent selected by the present invention utilize heavy metal crystallization wrapper technology, will be in contaminated soil
Heavy metal carries out electronation and stabilization treatment, so that its leaching concentration is greatly reduced, to meet the dense of correlation standard
Spend limit value.To verify its validity, the present embodiment utilizes labs small-scale experiment, concrete condition as follows：
(1) laboratory lab scale situation
1) soil pretreatment
Three, region of contaminated soil difference pollution concentration sample, each 1kg of sample are chosen, soil is made in every part of sample mixing
Aggregate sample first air-dries soil according to humidity condition progress is certain, and the soil after air-drying picks up the sundries such as stone, after being crushed
It is sufficiently mixed uniformly, measures soil pH value, each sample measures its content of 6-valence Cr ions and leach content, is divided into 4 parts and compiles respectively
Number.4 parts of samples are divided into 4 groups, 1 group is control group, does not add medicament；Other 3 groups are experimental group, and adding of agent ratio is respectively
0.2%, 0.3%, 0.4%.
2) stabilization agent preparation and operating procedure
The specific steps are：
1, pedotheque pH value according to surveying and determination suitably adjusts medicament pH with lime, and pH is too high or too low after avoiding dosing, makes
PH maintains neutral to alkalescent after dosing.
2, reducing agent is diluted according to the ratio of adding, after preliminary mixing, medicament is subjected to sprinkling and is added, sprinkling is simultaneously
Soil sample and medicament are mixed well, the caking for having big in soil is avoided, pedotheque pH is measured after mixing, maintenance is done after 3-5 days
Leaching test pays attention to the humidity for keeping soil during maintenance.
3, stabilization agent is added after conserving, maintenance does leaching test after 3-5 days.
(2) pilot run and analysis
Reducing agent is added according to the ratio of mass ratio 0%, 0.2%, 0.3%, 0.4% to experimental group sample respectively and is carried out
Stabilization processes add stabilization agent after conserving 3-5 days in same ratio, and stabilization processes carry out Cr VI after 3-5 days total
Amount and leaching concentration measure.Refer to table 3.
Table 3
The result shows that：The blank group of addition 0%, Cr VI total amount and leaching content are substantially unchanged, when primary sample sexavalence
Chromium total amount is 0.9,1.2 additions 0.2%, 0.3%, and when 0.4%, total amount is less than 0.25, leaches and is less than 0.05；Work as primary sample
When Cr VI total amount is 2.0, when adding 0.2% medicament, it is 0.31 that Cr VI total amount, which has detection, not up to repairs desired value,
Addition 0.3%, when 0.4%, total amount is less than 0.25, leaches and is less than 0.05；According to pilot plant test, the result shows that, the present invention provides
Reducing agent and stabilization agent can effectively reduce the content and leaching concentration of Cr VI in soil.
According to laboratory pilot run, when adding of agent ratio is 0.3%, 0.4% as can be seen from the table, Cr6+Total amount and
Leaching can reach reparation desired value.Consider medicament injection after can be reacted with other heavy metals in soil and process of osmosis in cause
Drug out loss.Therefore, in dosages distribution, reducing agent and stabilization agent are added than when not less than 0.3%, enabling to Cr6+
Total amount and leaching can reach reparation desired value.
(3) conclusion
According to the above pilot plant test result and suggestion, reducing agent, the stabilization agent that this experiment is selected can effectively reduce dirt
The content and leaching concentration of Cr VI in soil are contaminated, there is good stabilization processes effect, but advised greatly in actual place
Mould is in application, need to carry out pilot experiment, further clear adding of agent ratio and the radius of influence.
The present embodiment has done the analysis of medicament timeliness to medicament, specially：
(1) reducing agent is the reparation medicament for Cr VI, mainly plays reduction, is trivalent by hexavalent chrome reduction
Chromium reduces toxicity, the migration of chromium, and chromium is made to be converted into the trivalent chromium state for being easy to stable, is the stabilisation of later stage stabilization agent
Work is used as guarantee.And trivalent chromium as chromium it is relatively stable in nature there are valence states, in natural conditions, only pass through strong oxygen
Agent effect can just be oxidized to Cr VI again.
Meanwhile the targeted contaminated soil of the present invention is in backfill absolute altitude 20-30m and hereinafter, according to place future plan,
Former address place will carry out structural closing, be formed and protected to Polluted area, can effectively be obstructed soil and be in direct contact with the external world, prevent
Only oxidation material enters soil horizon.The use of reducing agent by hexavalent chrome reduction is trivalent chromium, and using steady in project implementing process
Determine agent and stabilization processes are carried out to trivalent chromium, stabilization agent forms stable macromolecular by chelation, with trivalent chromium and stands
Body chelate, this process greatly reduce trivalent chromium concentration, avoid being oxidized to Cr VI again, three have been obstructed from source
Conversion of the valence chromium to Cr VI reduces the risk that trivalent chromium is aoxidized again.
(2) stabilization agent is a kind of novel high polymer chelating agent, it is characterized in that carrying several chelatings on macromolecular scaffold
Functional group, the chelating function group have selective chelation, trap heavy metals ion tool to contents of many kinds of heavy metal ion
There is the characteristics of high efficiency and stability (coordination is powerful), forms reticular structure with heavy metal after coordination, can deposit steadily in the long term
.
Therefore, stabilization agent forms highly stable netted knot as a kind of macromolecule organic sequestering agent with heavy metal
Structure product can keep stablizing within the scope of the pH of suitable wide cut, have preferable long-time stability.
The present embodiment has done HAZAN to soil remediation medicament used in the present invention, specific as follows:
It is tested using " maximum limitation method ", oral test dose is 5000mg/kg b.wt., and percutaneous test dose is
2000mg/kg b.wt. in experimentation, have no apparent poisoning manifestations after male and female exposed rats, observation period (14d) interior animal without
Death, gross anatomy are shown no obvious abnormalities.Conclusion is that " male and female rat acute LD50 values are more than 5000mg/kg b.wt., sample
Product category low toxicity level；The percutaneous LD50 values of male and female rat acute are more than 2000mg/kg b.wt., sample category low toxicity level." it is possible thereby to
Find out, influence very little of the reducing agent for health.
In addition, by engineering practice, a large amount of leach proves that heavy-metal contaminated soil is through crystallization packet with acid washing test
Using existing after envelope processing《Solid waste Leaching leaching method hac buffer method》 (HJ/T300-2007)、《Gu
Body waste Leaching leaching method horizontal vibration method》(HJ/T557-2010) and《Solid waste Leaching leaching method sulphur
Acid+nitric acid method》(HJ/T299-2007) etc. pre-treating method is leached, harmful components disclosure satisfy that relevant criterion is wanted in leaching
It asks, also shows stability, the safety of the medicament indirectly.
Medicament environmental hazard is analyzed：
(1) reducing agent environmental hazard is analyzed
Reducing agent is one kind specifically for Cr6+Reparation medicament, by its chemical composition analysis understand, may be to week
It is sulphur that side, which influences maximum factor, mainly utilizes S2-By Cr6+It is reduced into Cr3+, sulphur can be formed after reaction, since sulphur is unstable,
The lower sulfate ion of concentration can be ultimately become by series reaction, carry out protection and the Disposal Measures of sulfate ion,
Its influence to water body, concrete structure can be minimized.Main counter-measure is as follows：
1) when researching and developing medicament, under the premise of meeting medicament validity, a certain proportion of calcium constituent and medicament are added to
Active ingredient is matched, and the heavy metal ion in calcium ion and soil in medicament will form sulfuric acid object with sulfate ion
Precipitation greatly reduces free state sulfate concentration in soil.
2) contain hydroxide ion in reducing agent, corrosion of the sulfate ion to concrete can be inhibited to a certain extent
Property, therefore influence of the sulfate ion to place building is smaller.
3) it is directed to backfill pollution of chromium, place rock-soil layer is mainly by backfill, silty clay, intense weathering munstone and medium wind
Change mud stone composition, wherein medium weathering mud stone is the relative water resisting layer of place, and the medicament of in-situ injection will not ooze down to shallow substantially
Layer aquitard.Reparation place intermediate region is periphery basement rock tendency lowest point, and under normal circumstances, the medicament injected leaves waste water
It can be preferentially collected to the region, waste water is then evacuated to reuse after collecting pit is disposed by extraction well, there is no outer row's situations, and
The raw material of medicament are mainly the substances such as nature mineral material, absorbable chemical salt, will not extended residual or production in the soil
Raw harmful substance influences periphery minimum.
(2) stabilization agent environmental hazard is analyzed
The main component of stabilization agent is organic sulfur, reacts (Me is heavy metal) formation with heavy metal by chelation group
The macromolecular solid chelate products of the extremely difficult macromolecular solid chelate products for being dissolved in water, generation are strong in high temperature (250 DEG C), strong acid
Property stabilization is not decomposed under the conditions of alkali, and raw material are mainly the substances such as nature mineral material, absorbable chemical salt, Bu Hui
Harmful substance is remained or generated for a long time in soil, will not cause secondary pollution to environment.
Embodiment 2：
It is screened according to recovery technique, and situation is made an on-the-spot survey in conjunction with place, the present embodiment is restored and stabilized using in-situ chemical
Repairing and treating is hexavalent chromium polluted, and the technological process of implementation is shown in that Fig. 7, specific technique are described as follows：
(1) in-site measurement is carried out, determines repair coverage and side's amount；
(2) face construction and apply and build, be ready for subsequent construction, while carrying out slope retaining and work is built in gutter；
(3) shallow-layer backwater monitoring well is built；
(4) injector well position coordinates are measured；
(5) injector well is built, medicament configuration is carried out at the same time；
(6) medicament injection is carried out according to design proportion, the waste water of generation is stripped, handles simultaneously reuse；
(7) medicament conserves 3-5 days, and development is checked and accepted certainly, checks and accepts rear progress third party's examination up to standard certainly.
The present embodiment selects a project place to carry out pilot experiment, has covering on the contaminated soil in this project place about
20~30m backfills the cubic metre of earth and stone.According to the exploration information for 101 drilling that geology prospecting report obtains, formation is generalized as
Three layers：Respectively weathered mudstone/sandstone layer (is considered as in first layer fill stratum, second layer intense weathering munstone/sandstone layer, third layer
Water barrier).Fig. 2 and Fig. 3 is formation form general model figure, it can be seen that the thickness on each generalization stratum, place southeast side are whole
Topography is higher, and middle part is by south and place northwestward hypsography low-lying.Second layer thinner thickness, but pollutant is concentrated mainly on this layer
In.Fig. 4 and Fig. 5 be place water barrier, it can be seen that the place more other regions of southeast corner topography are higher by very much, north side topography relatively in
Portion is higher.Fig. 6 be shallow-layer backwater runoff distribution map, it can be seen from the figure that contaminated sites region be mainly distributed on topography it is lower in
Portion region.There are backwater, water table aquifer and interflow subsurface drainage water body flow directions for from northeast, southwester, this is also medicament on the stratum
Injector well design, the laying of shallow-layer backwater monitoring well provide reference frame.
Repair temporary facility：Wastewater collection pond, sludge keep in field, medicament stockpiling field, medicament configuration field.
As shown in figure 8, purification tank for liquid waste is by wastewater collection pond 1, setting pot 2, reduction reaction pond 3, pH regulating reservoirs 4, precipitation
Reaction tank 5, clear water reserviors 6 are constituted.Waste water enters setting pot 2 via wastewater collection pond 7 first, removes gravel；Then it is adjusted back through pH
It is trivalent chromium by hexavalent chrome reduction after pond 4 and reduction reaction pond 3 add acid and reduction medicament；Then add in precipitation reaction pond 5
Add alkali to remove the pollutant (considering to carry out two stage treatment according to water quality difference) of flocculation sediment with flocculant, goes out after qualification after testing
Water enters clear water reserviors.Clear water reserviors 6 configure medicament reuse, not outer row.It is poured using mixed mud when purification tank for liquid waste is built, and stringent
Seepage control measure is carried out, in bottom of pond construction, mixed mud is sealed after the completion of pouring；And covered using rain-proof paulin, prevent
Only rainwater influences later stage effluent monitoring result.
Medicament 581.416t is needed in the present embodiment altogether, is used after 5 times of dilution, it is 2907m that total amount, which is perfused, in medicament3, it is contemplated that
30% medicament, water, slurry mixture are extracted out with extraction well, altogether about 872m3；10 notes are perfused according to every batch of in medicament injection
Well is penetrated, about 78 batches need to be perfused altogether, the loss medicament of every batch of extraction is about 11.2m3, consider other of field construction generation
Waste water, wastewater treatment tankage is according to 50m3It is designed, handles in batches and carries out loss medicament reuse.Wastewater treatment area master
Construction of structures design size is wanted to refer to shown in table 4, Fig. 8.
Table 4
1 sludge is built respectively in place west side and northeast side and keeps in field, and floor space is respectively 150m2, it is mainly used for
Store up the Polluted Soil that injector well probing extraction soil, the sludge that purification tank for liquid waste generates, pile foundation generate.It is poured using mixed mud when building
It builds, and strictly carries out seepage control measure, in bottom of pond construction, mixed mud is sealed after the completion of pouring using sealing compound；And it uses
Rain-proof paulin is covered, and prevents rain leaching from generating secondary pollution.
Medicament configuration place is laid at the northeast of place, floor space about 50m2, it is mainly used for medicament dilution, stirring.
Medicament stockpiling field is located at the northeast of place, floor space about 200m2。
It according to place surveys data and surveys overview again, in conjunction with other similar projects successful cases, vasopressing injection technique medicament
Dilation angle is designed according to 2.5m, and high-pressure rotary-spray medicament dilation angle is designed according to 1m, is laid respectively in 11#, 21#
4 mouthfuls of injector wells form the square area that the length of side is 5m, as shown in Figure 9.Effect is injected for enhancing medicament, in the square the heart
1 mouthful of extraction well is arranged in region.When injector well and extraction well position, physical prospecting need to be carried out, avoids damaging in injector well drilling process
Underground utilities.Injector well perfusion technique refers to table 5.
5 injector well perfusion technique list of table
According to 1 laboratory small-scale experiment data of embodiment, according to 0.5%, 1% adding of agent ratio, in conjunction with quantitatively commenting
Estimate report conclusion, the pollution soil thickness of 11#, 21# takes 1m, 2m to carry out the calculating of pharmaceutical quantities respectively, and the wherein soil weight is
1.8t/m3, single hole medicament injection rate refer to the following table 6：
6 pilot scale point medicament injection rate of table
After medicament conserves, for judge in the region 11#, 21# the injection effect of each pilot scale point difference perfusion technique and
Medicament dilation angle need to be arranged 14 soil samplings according to pouring-in, two kinds of techniques of high-pressure rotary-spray principal radii and check and accept point.
Point arrangement refers to the following table 7.
List of layouting is checked and accepted in 7 pilot scale of table
Pilot plant test samples, and the present embodiment drills 14 altogether, samples 33 samples, monitoring result is as shown in table 8.
8 pilot plant test sampling inspection results of table
The exceeded testing result of 9 pilot scale on-the-ground test of table processing soil
According to table 8, table 9, when the direct weighting injection radius of influence is 3.0-3.5m, reparation mesh in place cannot be met
Scale value；When the high-pressure rotary-spray radius of influence is that 1.5m is sampled, reparation desired value in place cannot be met.At pilot plant test experiment
Native inspection is managed as a result, considering that place soil is inhomogenous, and infiltration and interflow subsurface drainage direction, obtains following pilot scale conclusion.
It is combined using the pouring-in technique of direct weighting and high-pressure rotary-spray technique and carries out pilot scale medicament perfusion, it is native according to checking and accepting
Sample monitoring result obtains two kinds of technique optimal processing parameters, is shown in Table 10.As can be drawn from Table 10, using direct weighting injection medicament
The injector well radius of influence be 2.5m, best adding of agent ratio be 1%, time 120min；Medicine is injected using high-pressure rotary-spray
The injector well radius of influence of agent is 1m, and best adding of agent ratio is 1%, time 60min.
10 pilot plant test parameter list of table
Embodiment 3：
The present embodiment selects a reparation place to be tested.It repairs place and is located at the big masonry dam Hongyuan in Chongqing City Jiangbei District
Road belongs to the big masonry dam in Chongqing City Jiangbei District and forms a team the plot J, K standard subregion K04-3/02,106 ° 29 ' ' 35 of place center latitude ",
29 ° 34 ' 06 of latitude ".
Topography and geomorphology：It was hills landforms originally to repair place, had been flattened, the high northwest in the southeast is low on the whole.Because of development ＆ construction,
There is a soil quality dam in place southern side, is formed for the direct throwing of surrounding development ＆ construction, high about 20m, about 45 ° of slope angle, proposed place
Present situation 208~245m of absolute altitude, relative relief about 37.00m, for topography compared with big rise and fall, landform slope angle is generally 5~10 °, side slope
The section gradient is up to 55 °.
The meteorological, hydrology：According to the data that Chongqing City Weather Bureau provides, the prospecting area subtropical zones Nei Shu moisten monsoon climate, tool
Having the winter to warm up, the spring is early, hot cool autumn days in summer, has a moderate climate, abundant rainfall, and air humidity is big, the climatic characteristic more than cloud and mist.Long-term average air
18.4 DEG C of temperature.43 DEG C of Extreme Maximum Temperature (on August 8th, 2006), -2.4 DEG C of Annual lowest climate temperature (on December 15th, 1975).It is more
Average annual rainfall 1151.5mm, maximum daily rainfall 96mm average for many years, maximum daily rainfall 266.6mm (July 17 in 2007
Day), the distribution of season of precipitation is uneven, and wherein spring accounts for the 30% of precipitation, and summer accounts for 37%, and autumn accounts for 27%, and winter
6% is only accounted for, the precipitation of 5-Septembers is most, accounts for the 66.1% of annual precipitation, and wherein heavy rain, heavy rain focuses mostly in 7~August,
Intensity is big.It repairs place periphery to be enriched with without surface water such as river, streams and fish ponds, by seeing drilling water level during prospecting
It surveys, banketing, section deeper carries out bailing test, moment forms " dry hole ", observation there are underground water by drilling to the location
Return water water level, water level restore very slow, can not obtain effective bailing test achievement.Therefore place underground water be mainly perched water and
Pore water is mainly fed by Atmospheric precipitation, no fixed level.
Geological structure：According to areal geology data, repairs place and be located at the temples Jin Ao to the oblique northwest (NW) wing, rock stratum is in Jurassic system
It unites sandy soil stabilizer mud stone and sandstone, passes through without tomography in place.Survey in the venue the attitude of rocks be 120 ° of 17 ° of ∠.Pass through
Investigation to neighbouring basement rock exposure location, without cementing between rock level, surface is straight, in conjunction with difference, belongs to hard structural plane.Proposed field
Major developmental has following two groups of structural fractures in ground rock mass：
(1) LX1 is inclined to 50 °, and 79 ° of inclination angle is more straight, parts shape a little, and no filling extends 4.0~8.0m, crack spacing 2.0
~4.0m in conjunction with difference, belongs to hard structural plane without cementing；
(2) LX2 is inclined to 130 °, and 80 ° of inclination angle is more straight, parts shape a little, and no filling extends 4.0~9.0m, crack spacing
3.0~4.0m in conjunction with difference, belongs to hard structural plane without cementing.
Ground rock characteristic：According to this results of drilling, formation is broadly divided into：4th is Holocene series plain fill layer
(Q4ml), system lower chromatic number (J2s) mud stone and sandstone in Jurassic system.Its lithologic character is from top to bottom described below：
(1) the 4th is Holocene series plain fill layer (Q4ml)
Plain fill：It is variegated, mainly it is made of cohesive soil and rock fragment, wherein hard content of material accounts for about 11~31%, it is more
Throwing is flattened for building yard to form, it is slightly wet~wet, loosely, dead weight consolidation is not completed, the accumulation time limit about 4 years is not contaminated.Root
It is disclosed according to this prospecting probing, which is distributed in entire place, and thickness is average between 0.50m (ZY22)~45.30m (ZY81)
Thickness about 27.11m.
(2) lower chromatic number stratum (J2s) is united in Jurassic system
1) system lower chromatic number (J2S-Ms) mud stone in Jurassic system：Brown red, aubergine, main component are clay mineral, mud
Matter structure, thick-layer columnar structure, crack are relatively developed.The layer is distributed in proposed place, by its rate of decay can be divided into it is severely-weathered,
Medium weathering band.
Intense weathering munstone：Brown red, aubergine, catamorphism, developmental joint fissure, core are broken in broken for most of mineral
Blocky, soil is caught broken blocky and short cylinder, and sillar taps frangible.This prospecting discloses the layer in 69 drillings, and layer probing discloses
Thickness 0.5m (ZY75)~3.2m (ZY1), most of thickness are within 1.50m, average layer thickness about 0.99m.
Medium weathering mud stone：Brown red, aubergine, main component are clay mineral and quartz, fine debris, shale~aleuritic texture
Structure, thick-layer columnar structure is even to press from both sides thin layer gray post band, and local weathering fissures are relatively developed, and core is in short cylinder, and section is long by 6~
45cm, core is more complete, is soft rock.
2) system lower chromatic number (J2S-Ss) sandstone in Jurassic system：Steel gray, canescence.Mineralogical composition is long based on quartz
Stone takes second place, and containing mica etc., middle acinose texture, thick-layer columnar structure, calcite cementation, crack is relatively developed.The layer is equal in proposed place
It is distributed.It can be divided into severely-weathered, medium weathering band by its rate of decay.
Intense weathering soft rock：Canescence, isabelline, weathering fissures are developed very much, and protolith structure is largely destroyed, and core is in sand
Shape, chunky shape and short cylinder, sillar tap frangible.This prospecting discloses the layer in 32 drillings, is sporadicly distributed in entire place,
Probing discloses thickness 0.5m (ZY10)~2.1m (ZY2).Medium weathering sandstone：Canescence, cinerous, main mineral constituent are stone
English, feldspar and a small amount of clay mineral, acinose texture, thick-layer construction, argillaceous agglutination, stratification and crack are relatively developed.Rock matter is hard,
Knock is crisp.Core is more complete to be in the form of a column, and long 5~55cm is saved.
Place basement rock is repaired based on mud stone, sandstone is in interlayer or lenticular body shape, part location mud stone and sandstone alternating layers.
The reparation place mounds the Shu Qian denudational landform of the present embodiment selection, microrelief are slope coombe landforms.Rainwash item
Part is preferable, the geological conditions without a large amount of enrichment underground water, underground water agensis.Now groundwater condition is summarized as follows：In place
Groundwater type is Quaternary pore water and Bedrock Crevice Water.Pore water is distributed mainly on place plain fill band thicker, water
It is smaller, mainly by atmospheric precipitation and surface water supply；The main preservation of Bedrock Crevice Water is controlled in bedrock fracture by crack,
Atmospheric precipitation and the supply of pore water, bedrock fracture is not very developed in place, and crevice water is limited.This prospecting is to place internal drilling
Carried out fixed level observation, probing residual water drained behind whole hole, carried out hydrological observation afterwards for 24 hours, all drilling water levels substantially without
Restore.Illustrate that on-site Quaternary pore water and Bedrock Crevice Water are poor, has no groundwater occurrence, therefore place is deep in this prospecting
It is poor to spend underground water in range, but rainy season place plain fill thicker section may preservation more rich perched water, in foundation pit
Slot may also can cause collecting for underground water when constructing, and pumping drainage measure appropriate should be taken in work progress.
It is screened according to recovery technique, and combines reconnaissance trip situation, this project is restored and stabilized using in-situ chemical and repaiied
Administer again it is hexavalent chromium polluted, the present embodiment implement technological process see that Fig. 7, specific technique are described as follows：
(1) in-site measurement is carried out, determines repair coverage and side's amount；
(2) face construction and apply and build, be ready for subsequent construction, while carrying out slope retaining and work is built in gutter；
(3) shallow-layer backwater monitoring well is built；
(4) injector well position coordinates are measured；
(5) injector well is built, medicament configuration is carried out at the same time；
(6) medicament injection is carried out according to design proportion, the waste water of generation is stripped, handles simultaneously reuse；
(7) medicament conserves 3-5 days, and development is checked and accepted certainly, checks and accepts rear progress third party's examination up to standard certainly.
Situation is verified according to 2 pilot experiment of embodiment, the present embodiment injector well is layouted layouts according to the grid of rectangular 5m, shadow
Radius ROI=2.5m is rung, the area coverage of a well is about 19.63m2, in conjunction with live reality, avoids place and has pipeline position
It sets, is laid and calculated by theory, arrange 432 mouthfuls of injector wells altogether.7 radius of influence of injector well is shown in Figure 10.
According to place exploration survey, in conjunction with the average elevation after average substrate and flat field, injector well is presented not according to absolute altitude
Place is divided into 7 regions a-g, the injector well in each area by same drilling depth for convenience of the drilling depth of injector well is counted
Quantity and drilling depth are as shown in table 11 below.Root is it is estimated that need to drill 9801.41m, but according to pilot plant test drilling data,
Since this place is irregular, it is therefore desirable to consider drilling depth, total drilling depth (9801.41m) * safety factors (5%)=
491m, therefore the present embodiment in-situ injection drilling depth is 10292.41m.
11 place drilling hole number of table and deep statistical table
Situation is verified according to pilot experiment, the Nan Xi areal geology situations in place are more complex, overlying quaternary formation thickness
Greatly, most thick about 27m, and loosely, porosity is larger, therefore in view of shallow-layer backwater flows to, high-pressure rotary-spray is used to the region
Technique.In order to ensure that Polluted area all covers, laid using single high-pressure rotary-spray in east region.The present embodiment mesohigh revolves
Spray injector well scattered point design injector well is layouted using quincunx (equilateral triangle) mode, and 8 radius of influence of high-pressure rotary-spray injector well is shown in
Figure 11, radius of influence R OI=1m, well spacing L=1.8m.Situation is surveyed in base area, and place shallow-layer backwater to east northeast flows to Nan Xi, knot
It is larger to close the pilot plant test place undergrounds Nan Xi gap, to ensure that pollutant can be effectively treated in the region medicament, avoids medicament everywhere
Lower runoff loss is migrated to place, and medicament note is carried out using high-pressure rotary-spray method in the wide region in about 6 meters of place south edge
Enter, and sets up two medicine discharging agent extraction wells (same to injector well).High-pressure rotary-spray injection zone overall length 273m, the wherein regions 6m, 3-4 rounds are
122 meters, high-pressure rotary-spray hole count is 264, and churning depth is located at absolute altitude 193.2-196.3m.Single hole region is 151 meters, high pressure
Churning hole count is 79.Churning depth is located at absolute altitude 195.8-196.8m.It is laid and is calculated by theory, arrange 343 mouthfuls of notes altogether
Penetrate well.Refer to table 12.
12 high-pressure rotary-spray statistical form of table
It is hexavalent chromium polluted that the present embodiment, which is directed to, and according to pilot plant test conclusion, adding of agent ratio is 1% optimal.It is first
First use reducing agent by Cr6+It is reduced to Cr3+, stabilization agent is reused to Cr3+And other heavy metals carry out stabilization processes.Cause
This reducing agent and stabilization agent) contaminated soil side to be treated amount is 16150.5m3.Need reducing agent and stabilization agent each
290.708 tons (291 tons of roundings) add up to 582 tons.By calculate reducing agent and stabilization agent add ratio and dosage is shown in Table
13。
Note：The soil weight is according to 1.8t/m3It calculates.
13 stabilization agent injection rate of table is calculated
For the present embodiment according to shallow-layer backwater runoff direction reasonable Arrangement monitoring well, 3 mouthfuls of shallow-layers are arranged in upstream, downstream in total
Backwater monitoring well, as shown in figure 12.
It includes following steps to monitor well construction.
(1) shaft building material
Monitoring well well casing uses PVC pipe (for pure PVC without other adding ingredients, thickness is 4~6mm).Monitoring well casing should be adopted
With hickey, any bonding agent must not be used.Drainage pipeline section should use 120 mesh steel wire loopings, be fixed using sealing strip.Well
Mouth protection sleeve pipe should be stainless steel.Monitoring well filtering material is using classification (coefficient of uniformity is between 1.5~2.0) quartz sand
As filter layer filtrate.Filtering material should be rinsed before, when drilling well place stores it is ensured that not contacted with pollutant
And foreign matter is prevented to be mixed into.In filter layer top and the bottom, annular gap should be insulated using sealing material.The material used is
Bentonite and cement.
(2) drilling operation
Drilling tools should use physical method decontamination, derusting before use.The detergent of use is answered nontoxic.Driller
Process meets coring requirement, and 4m or more soil layers must use drilled dry (being not added with water) mode.When rock section is crept into, drilling water is not
It obtains and uses contaminant water, poor-quality water.It should carry out drilling core record.
(3) down tube
It is arranged in the following order from earth's surface to downhole pipe：Wall casing, filter pipe, sediment tube.After drilling reaches design requirement,
It should be punched out before tripping in monitoring well casing, change slurry.Punching drilling rod should be transferred to bottom hole when punching, with big pump amount punching deslagging,
After rock slag in hole empties, fluid viscosity will be rinsed, 18~20s, density is reduced to be reduced to 1.1~1.15g/cm3.Monitoring well
Depth should be more than known maximum shallow-layer backwater buried depth or less 2m.Water-bearing layer lower sandstone layer should be sealed using quartz sand
It fills out.Diving monitoring well must not penetrate the bottom plate of the water barrier under phreatic aquifer.Every hundred meters of well depths of monitoring well apex angle gradient must not
More than 1 °.The whole bore dia of new chisel monitoring well is 127m, and monitoring well well casing internal diameter is not preferably less than 80mm, and water-bearing interval should install filter
Water pipe (floral tube), anti-filter layer thickness are not less than 0.05m, and Cheng Jinghou should carry out the well-flushing that draws water.Righting well casing is answered when down tube, is ensured
Well casing is located at hole center.Filter pipe (floral tube) length should be equal to water-bearing layer overall thickness in testing goal layer.Monitoring well casing should use
Hickey must not use any bonding agent.Drainage pipeline section is to twine silk to embed filter.
(4) gravel is filled out
Using classification (coefficient of uniformity is between 1.5~2.0) quartz sand as filter layer filtrate.From bottom to top, sediment tube
The periphery of the clay particle filling that periphery need to use 0.6~1.2cm of diameter spherical or flat, filter pipe and upper part well casing is both needed to use
Filtrate tamps.Enclose the thickness for filling out filtrate, no less than 50mm.
(5) sealing, well-flushing, sealing of hole
Monitoring well should carry out permanent leaking water, and sealing material selects bentonite.Sealing layer thickness in monolayer is not preferably less than 5m, throws
Enter clay ball to subsurface 2m.After closing and sealing, it is necessary to carry out well-flushing in time.It is examined after well-flushing to cleaning effect
It tests, the water of monitoring well extraction is answered as clear as crystal, and sand content mass ratio is less than 1/200000 it is believed that well-flushing is qualified.It is sealed with cement
Hole.In subsurface 2m sealing layers, is shunt in a well to ground with cement, be connected with raised platform around a well construction.
(6) tree-protector
The vertical view and side view of tree-protector are as shown in Figure 13, Figure 14.Monitoring well (hole) mouth is answered above ground level
0.5-1.0m, well head install protection cap, aperture mounting cap, and bidding is known.Protective device includes concrete material for protecting
The aperture cap 10 of pedestal 9 and the steel plate support of guide-well pipe 13.9 height of pedestal is not less than 70cm, is not less than wherein entering ground height
30cm, leaks out ground level 40-50cm, and 9 diameter of pedestal should be greater than 10 diameter 15cm-20cm of aperture cap.Aperture cap steel pipe 12 is thick
Degree is not less than 10mm, height 30cm, and diameter is not less than 34cm, a locked instrument 11 is designed on aperture cap 10.
The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；Although with reference to aforementioned each reality
Applying example, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each
Technical solution recorded in embodiment is modified, and either carries out equivalent replacement to which part or all technical features；And
These modifications or replacements, the range for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution,
It should all cover in the claim of the present invention and the range of specification.
Claims (10)
1. a kind of regulation method based on 20 meters or less backfill pollutions of chromium, it is characterised in that：Include the following steps：
Step 1：In-site measurement is carried out, determines repair coverage and side's amount；
Step 2：Smooth location is built and faces construction and apply, while doing slope retaining and work is built in gutter；
Step 3：Build shallow-layer backwater monitoring well；
Step 4：Determine injector well installation location；
Step 5：Injector well is built, medicament configuration is carried out at the same time；
Step 6：Injector well carries out medicament injection according to a certain percentage, is stripped to the waste water of generation, handles simultaneously reuse；
Step 7：Medicament is conserved 3-5 days, is carried out from examination.
2. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 1, it is characterised in that：Institute
State step 4 include the radius of influence be 2.5m injector well layout and layout according to the grid of rectangular 5m and/or the radius of influence is 1m
Injector well according to the length of side be 1.8m equilateral triangle mode layout.
3. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 2, it is characterised in that：Shadow
It rings the injector well that radius is 2.5m and medicament injection is carried out using the pouring-in technique of direct weighting, the radius of influence is that the injector well of 1m is adopted
Medicament injection is carried out with high-pressure rotary-spray technique.
4. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 1, it is characterised in that：Institute
It includes reducing agent and stabilization agent to state the medicament in step 5, and the reducing agent is mainly by calcium polysulfide, sulfide and calcium hydroxide
Composition, the stabilization agent are mainly made of phosphate, tri-thiol triazine trisodium salt and a small amount of other elements.
5. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 4, it is characterised in that：Institute
Reducing agent is stated mainly to be made of 13~16% calcium constituent, 40~50% element sulphur and 20~30% carbon.
6. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 4, it is characterised in that：Institute
State stabilization agent mainly by 23~24% sodium element, 4~5% P elements, 33~34% oxygen element, 19~20% sulphur
Element forms.
7. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 4, it is characterised in that：Institute
It states in step 6, medicament injection process is：Reducing agent is first added than the ratio not less than 0.3% according to adding, then according to adding
Stabilization agent is added than the ratio not less than 0.3%.
8. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 1, it is characterised in that：Institute
It states the waste water generated in step 6 and enters setting pot through extracting first, remove gravel；Then it adjusts back pond through pH and reduction reaction pond is thrown
It is trivalent chromium by hexavalent chrome reduction after acid adding and reduction medicament；Alkali is finally added in sedimentation basin and flocculant removal flocculation is heavy
The pollutant in shallow lake is discharged after sampled detection is qualified and enters clear water reserviors work configuration medicament reuse.
9. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 1, it is characterised in that：Step
Built in rapid 2 face construction apply including：
1 sludge keeps in field, and floor space is 140~160m2, for storing up injector well probing extraction soil, purification tank for liquid waste generates
Sludge, pile foundation generate Polluted Soil；
1 medicament configuration field, floor space are 45~55m2, for medicament dilution, stirring；
1 medicament stores up field, and floor space is 190~210m2。
10. a kind of regulation method based on 20 meters or less backfill pollutions of chromium according to claim 1, it is characterised in that：
Shallow-layer backwater monitoring well is built in the step 3 to include the following steps：
Step 301：Drilling operation：Drilling tools are using detergent to be decontaminated, derusted using preceding, and 4m or more soil layers must be adopted
With drilled dry mode, is used when rock section is crept into plus water drilling visits mode；
Step 302：Down tube：It is arranged in the following order from the downward monitoring well well casing of earth's surface：Wall casing, filter pipe, sediment tube, drilling
It after reaching design requirement, being first punched out before tripping in monitoring well well casing, changes slurry, punching drilling rod should be transferred to bottom hole by when punching,
With big pump amount punching deslagging, after rock slag in hole empties, fluid viscosity will be rinsed and be reduced to 18~20s, density is reduced to 1.1~
1.15g/cm3；The monitoring well well casing internal diameter is not preferably less than 80mm, and water-bearing interval should install filter pipe, and anti-filter layer thickness is not small
Righting wall casing is answered when 0.05m, down tube, ensures that wall casing is located at hole center, drainage length of tube should be equal in testing goal layer
Water-bearing layer overall thickness, the wall casing, filter pipe, sediment tube are connected through a screw thread, and final down tube Cheng Jinghou carries out the well-flushing that draws water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810401000.0A CN108637003A (en) | 2018-04-28 | 2018-04-28 | A kind of regulation method based on 20 meters or less backfill pollutions of chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810401000.0A CN108637003A (en) | 2018-04-28 | 2018-04-28 | A kind of regulation method based on 20 meters or less backfill pollutions of chromium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108637003A true CN108637003A (en) | 2018-10-12 |
Family
ID=63748735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810401000.0A Pending CN108637003A (en) | 2018-04-28 | 2018-04-28 | A kind of regulation method based on 20 meters or less backfill pollutions of chromium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108637003A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365522A (en) * | 2018-12-10 | 2019-02-22 | 北京博诚立新环境科技股份有限公司 | A method of the reparation of contaminated soil anaerobic organism is carried out using bioreactor |
| CN110449455A (en) * | 2019-08-07 | 2019-11-15 | 光大环境修复(江苏)有限公司 | A kind of restorative procedure for the contaminated soil that heavy metal lead is exceeded |
| CN110846044A (en) * | 2019-11-25 | 2020-02-28 | 连云港新江环保材料有限公司 | Efficient soil remediation agent and preparation method thereof |
| CN111794285A (en) * | 2020-06-08 | 2020-10-20 | 郑州大学 | Horizontal blocking method for risk control of polluted land |
| CN112658013A (en) * | 2020-12-22 | 2021-04-16 | 昆明理工大学 | Method for in-situ disposal of building solid waste and prevention and control of horizontal migration of industrial site pollutants |
| CN113377126A (en) * | 2021-05-31 | 2021-09-10 | 湖北君邦环境技术有限责任公司 | Site survey stationing point location generation method, device, equipment and storage medium |
| CN114147060A (en) * | 2021-11-29 | 2022-03-08 | 四川佳士特环境检测有限公司 | Restoration method of hexavalent chromium contaminated soil |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624624A (en) * | 2014-12-19 | 2015-05-20 | 湖南凯天重金属污染治理工程有限公司 | Method for restoring severe chromium contaminated soil through in-situ elution and curing-stabilizing |
| CN104759458A (en) * | 2015-04-03 | 2015-07-08 | 北京建工环境修复股份有限公司 | Application and remediation method of calcium polysulfide in chromium-contaminated soil or underground water remediation |
| CN105013810A (en) * | 2014-04-16 | 2015-11-04 | 永清环保股份有限公司 | Chromium-contaminated soil remediation medicament and remediation method |
| CN105945050A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Biogas residue-based hexavalent chromium heavily-polluted site in-situ detoxification method |
| CN106984644A (en) * | 2017-05-10 | 2017-07-28 | 青岛科技大学 | The preparation of calcium polysulfide renovation agent and its application in pollution law |
| CN207238749U (en) * | 2017-08-03 | 2018-04-17 | 苏州中晟环境修复股份有限公司 | One kind injection extraction well formula soil in-situ elution repair system |
-
2018
- 2018-04-28 CN CN201810401000.0A patent/CN108637003A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105013810A (en) * | 2014-04-16 | 2015-11-04 | 永清环保股份有限公司 | Chromium-contaminated soil remediation medicament and remediation method |
| CN104624624A (en) * | 2014-12-19 | 2015-05-20 | 湖南凯天重金属污染治理工程有限公司 | Method for restoring severe chromium contaminated soil through in-situ elution and curing-stabilizing |
| CN104759458A (en) * | 2015-04-03 | 2015-07-08 | 北京建工环境修复股份有限公司 | Application and remediation method of calcium polysulfide in chromium-contaminated soil or underground water remediation |
| CN105945050A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Biogas residue-based hexavalent chromium heavily-polluted site in-situ detoxification method |
| CN106984644A (en) * | 2017-05-10 | 2017-07-28 | 青岛科技大学 | The preparation of calcium polysulfide renovation agent and its application in pollution law |
| CN207238749U (en) * | 2017-08-03 | 2018-04-17 | 苏州中晟环境修复股份有限公司 | One kind injection extraction well formula soil in-situ elution repair system |
Non-Patent Citations (6)
| Title |
|---|
| 中国煤田地质总局: "《煤田钻探工程 第四分册 特种钻探工程》", 31 January 1996 * |
| 吴文等: "电镀废水综合治理应用实例", 《材料保护》 * |
| 国土资源部地质环境司等: "《地质环境监测方法及其应用》", 31 August 2014 * |
| 张建荣等: "原位生物稳定固化技术在铬污染场地治理中的应用研究", 《环境科学》 * |
| 环境保护部环境监测司: "《"十二五"环境监测工作手册（2012版）》", 30 June 2012, 中国环境科学出版社 * |
| 郑家传等: "污染场地六价铬的还原和微生物稳定化研究", 《环境科学》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365522A (en) * | 2018-12-10 | 2019-02-22 | 北京博诚立新环境科技股份有限公司 | A method of the reparation of contaminated soil anaerobic organism is carried out using bioreactor |
| CN110449455A (en) * | 2019-08-07 | 2019-11-15 | 光大环境修复(江苏)有限公司 | A kind of restorative procedure for the contaminated soil that heavy metal lead is exceeded |
| CN110846044A (en) * | 2019-11-25 | 2020-02-28 | 连云港新江环保材料有限公司 | Efficient soil remediation agent and preparation method thereof |
| CN111794285A (en) * | 2020-06-08 | 2020-10-20 | 郑州大学 | Horizontal blocking method for risk control of polluted land |
| CN111794285B (en) * | 2020-06-08 | 2021-12-17 | 郑州大学 | Horizontal blocking method for risk control of polluted land |
| CN112658013A (en) * | 2020-12-22 | 2021-04-16 | 昆明理工大学 | Method for in-situ disposal of building solid waste and prevention and control of horizontal migration of industrial site pollutants |
| CN112658013B (en) * | 2020-12-22 | 2022-08-12 | 昆明理工大学 | Method for in-situ disposal of building solid waste and prevention and control of horizontal migration of industrial site pollutants |
| CN113377126A (en) * | 2021-05-31 | 2021-09-10 | 湖北君邦环境技术有限责任公司 | Site survey stationing point location generation method, device, equipment and storage medium |
| CN114147060A (en) * | 2021-11-29 | 2022-03-08 | 四川佳士特环境检测有限公司 | Restoration method of hexavalent chromium contaminated soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108637003A (en) | A kind of regulation method based on 20 meters or less backfill pollutions of chromium | |
| Coetzee et al. | An assessment of sources, pathways, mechanisms and risks of current and potential future pollution of water and sediments in gold-mining areas of the wonderfonteinspruit catchment: Report to the water research commission | |
| Whittemore | Geochemical differentiation of oil and gas brine from other saltwater sources contaminating water resources: Case studies from Kansas and Oklahoma | |
| Pan et al. | Priority control factors for heavy metal groundwater contamination in peninsula regions based on source-oriented health risk assessment | |
| Mossmark et al. | Hydrochemical changes caused by underground constructions—a case study of the Kattleberg rail tunnel | |
| Singhal | Environmental Impacts of Sandstone Quarrying at Keru, Jodhpur, Rajasthan | |
| Fayer et al. | Recharge Data Package for Hanford Single-Shell Tank Waste Management Areas | |
| Dodd et al. | A comparative field and laboratory study of fly ash leaching characteristics | |
| Daniell | Geochemical monitoring of soil pollution from the MWS-5 gold tailings facility on the Farm Stilfontein | |
| Hall | Influence of urban expansion on groundwater recharge in southeast Melbourne, Australia. | |
| Lahdenpera et al. | Summary of overburden studies at Olkiluoto with an emphasis on geosphere-biosphere interface | |
| Naylor et al. | Hydrochemical effects of using coal combustion byproducts as structural fill and capping material at an abandoned mine lands reclamation site, southwestern Indiana | |
| Smit | The geohydrology and related stability of the dolomite aquifer underlying Ikageng: Potchefstroom | |
| Kleeschulte et al. | Compilation and Preliminary Interpretation of Hydrologic Data for the Weldon Spring Radioactive Waste-disposal Sites, St. Charles County, Missouri: A Progress Report | |
| Director et al. | Dorstfontein West Mine Hydrogeological Investigation | |
| Галкин et al. | Assessment of phosphorus fertilizer wastes production impact on subterranean water quality (Gomel chemical plant, Republic of Belarus) | |
| Mohamed et al. | Site investigation | |
| Butler | Ground water pollution at sanitary landfill sites: geohydrological, environmental isotope and hydrochemical studies | |
| Strickland et al. | Rocky Mountain Geo-Conference 2018 | |
| Wołkowicz et al. | Liquidation and recultivation of repositories containing unwanted pesticides in Poland: current status and perspectives for solving the problem | |
| SHIPROCK et al. | SITE OBSERVATIoNAL Work PLAN FOR THE UMTRA Ppoje cr Sprg | |
| Plants | Technical Guide to Managing Ground Water Resources | |
| Buck et al. | INTEGRATION OF SURFACE WATER MANAGEMENT WITH MITIGATION OF GROUND WATER IMPACTS AT A PROPOSED PHOSPHATE MINE OVERBURDEN FACILITY1 | |
| Myburgh | Development of guidelines for the management of groundwater in and around rehabilitated coal discard facilities | |
| Kotoub | Groundwater vulnerability and pollution risk assessment of Jizzi Catchment, Sohar, Sultanate of Oman |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181012 |
|
| RJ01 | Rejection of invention patent application after publication |