CN208840200U - Spray place suitable for contaminated soil remediation technique - Google Patents
Spray place suitable for contaminated soil remediation technique Download PDFInfo
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- CN208840200U CN208840200U CN201821405231.0U CN201821405231U CN208840200U CN 208840200 U CN208840200 U CN 208840200U CN 201821405231 U CN201821405231 U CN 201821405231U CN 208840200 U CN208840200 U CN 208840200U
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Abstract
The utility model discloses a kind of spray place suitable for contaminated soil remediation technique, has leakage preventing structure, from top to bottom successively includes that solution collects lead layer, film up-protective layer, main impervious barrier, film lower protective layer and basal layer.Solution is collected lead layer and is made of concrete topping, guide french drain in field is provided in concrete topping, surrounding is provided with intercepting ditch.Spray system includes medicament pond, spray pipeline, the pump housing and solution collecting pit；Medicament pond connects main line one end by the pump housing, the main line other end connects multiple bye-passes, solution collecting pit connects the guide french drain that solution collects lead layer, it can be by waste collection derived in guide french drain, and it connects sewage treatment equipment and carries out wastewater treatment, sewage treatment equipment treated water reuse.The utility model enables leacheate to collect guide automatically, eliminates the difficulty that soil is separated with waste water, easy to operate, process runs well is reliable, can greatly shorten the construction period, save the cost, avoid generating secondary pollution.
Description
Technical field
The utility model belongs to environment remediation field, and in particular to a kind of spray field suitable for contaminated soil remediation technique
Ground.
Background technique
Currently, two thinkings of remediation contaminated soil: one is reducing pollutant in soil total amount；The second is by soil
Pollutant is stabilized, and does not reduce total amount, but reduce toxicity and migration.
Dump leaching elution technique, is able to achieve the perfect combination of both river harnessing ideas, elutes technique as realization hand to build heap
Pollutant is eluted from soil by spraying leacheate, reduces pollutant in soil total amount, for remaining dirt by section
Object is contaminated, is stabilized by the way of spraying stabilization agent, relative to the mix of simple soil and solid chemicals, more
Uniformly, react more thorough.
Conventional stabilisation thinking, be by soil and solid chemicals after mixing evenly, then sprinkling maintenance creates reaction condition,
Its implementation is thorough without the directly solution reaction of spray stabilization agent.
Therefore, it is necessary to design, one kind can be suitable for various heavy-metal contaminated soil renovation techniques and non-volatility is organic
Chemical leaching and electronation/oxidation is used alone or in combination with cooperation in the spray place of contaminants soil remediation technique
The technique for repairing all kinds of contaminated soils uses.
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of spray field suitable for contaminated soil remediation technique
Ground, it is suitable for various heavy-metal contaminated soil renovation techniques and non-volatility organic pollutant contaminated soil remediation technique,
It is particularly suitable for that the technique of chemical leaching Yu the repairing hexavalent chromium polluted soil of electronation is used in combination, the technique is practical by this
The spray place of novel offer realizes chemical leaching and the stabilized organic knot of electronation using the technique for building heap spray
It closes.
The utility model provides a kind of spray place of technique suitable for repairing hexavalent chromium polluted soil, the spray field
Ground has leakage preventing structure, from top to bottom successively includes that solution collects lead layer, film up-protective layer, main impervious barrier, film lower protective layer
And basal layer.
The solution is collected lead layer and is made of concrete topping；It is blind that guide in field is provided in the concrete topping
Ditch, surrounding are provided with intercepting ditch；The film up-protective layer selects geotextiles or bentonite blanket；The main impervious barrier is selected
HDPE geomembrane；The film lower protective layer selects clay, geotextiles or bentonite blanket；The basal layer be through overcompaction and
The surface layer of surfacing processing.
The spray place, which is also arranged in pairs or groups, is provided with spray system.
The spray system includes medicament pond, spray pipeline, the pump housing and solution collecting pit；The spray pipeline includes master
Pipeline and bye-pass, the medicament pond connect main line one end by the pump housing, are pumped into the medicament in medicament pond by the pump housing
In main line, the main line other end connects multiple bye-passes, and the bye-pass is set to the top in spray place, Ge Gezhi
Multiple spray heads or the bye-pass using floral tube form are arranged at intervals on pipeline, the solution collecting pit connection solution collection is led
The guide french drain of layer is arranged, can be by waste collection derived in guide french drain, and connect sewage treatment equipment and carry out wastewater treatment,
Treated that water is dissolved into reuse in medicament pond for sewage treatment equipment.
Check-valves is provided on the main line.
Filter is provided on the main line
The diameter of the main line is 50mm-70mm, selects UPVC, PE or PPR pipe.
The diameter of the bye-pass is 25mm-30mm, and PE is selected to manage, and branch pipe uses convenient for dismantling and adjusting in operation
The hose of spray head cloth point.
The utility model has advantages in that
The utility model enables leacheate to collect guide automatically, eliminates the difficulty that soil is separated with waste water, operation letter
List, process runs well are reliable, the generation that can greatly be shortened the construction period, save cost, avoiding secondary pollution.The utility model
It can be realized the removal of pollutant and the stabilized perfect combination of amounts of residual contamination, it, can be maximum to the greatest extent when handling contaminated soil
Pollutant in possible reduction soil, to remaining a small amount of pollutant further progress stabilization processes, repairing effect is more
Stablize.
Detailed description of the invention
Fig. 1 is that the structure in the spray place of the technique provided by the utility model suitable for repairing hexavalent chromium polluted soil is shown
It is intended to；
Fig. 2 is the technique stream that chemical leaching Yu the repairing hexavalent chromium polluted soil of electronation are used in combination in the utility model
Cheng Tu.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is a part of the embodiment of the utility model, instead of all the embodiments.Based on the reality in the utility model
Apply example, those of ordinary skill in the art's every other embodiment obtained without making creative work, all
Belong to the range of the utility model protection.
The present embodiment provides a kind of spray places of technique suitable for repairing hexavalent chromium polluted soil, as shown in Figure 1, spray
Leaching place leakage preventing structure be successively from top to bottom solution collect lead layer, film up-protective layer, main impervious barrier, film lower protective layer and
Basal layer；
The solution collects lead layer by guide french drain 10 in field (completely paving rubble, guide floral tube), 9 and of surrounding intercepting ditch
Concrete topping is constituted；Wherein guide french drain 10 is formed among concrete topping, by guide french drain 10, makes to flow into heap body
Liquid collect and flow out through guide french drain 10, surrounding intercepting ditch 9 is formed in concrete topping surrounding, and connects with guide french drain 10
It connects, the liquid in guide french drain 10 is passed through into the intercepting ditch 9 assembly and water conservancy diversion.
The film up-protective layer can select geotextiles or bentonite blanket, select 600g/m in this example2Nonwoven geotechnique
Cloth is as film up-protective layer；
HDPE geomembrane is selected in the main impervious barrier suggestion, selects 1.5mm thickness HDPE geomembrane as master in this example
Impervious barrier；
The film lower protective layer can select clay, geotextiles or bentonite blanket, select 600g/m in this example2Nothing
Geotextiles are spun as film lower protective layer；
The basal layer needs to be compacted and guarantee the smooth of surface.
Crushing and screening is carried out to the contaminated soil digged up clearly.Polluted Soil is carried out using ALLU crushing and screening bucket in this example
The crushing and screening of earth.Contaminated soil is transported on constructed spray place 8 and builds heap, forms heap body 11.
Spray equipment is laid above heap body 11 to spray to contaminated soil, spray system is as shown in Fig. 2, packet
It includes: medicament pond 1, spray pipeline, the pump housing 16 and solution collecting pit 3 etc..The medicament pond 1 connects main line 5 by the pump housing 16
One end is entered the compound pump in medicament pond 1 in main line by the pump housing 16, at the same be provided on the main line check-valves 14,
Flowmeter 15, the both ends of the pump housing 16 are provided with entrance door 17 and outlet portal 18, to form the switch of main line 5, also set up simultaneously
There is filter 12, undissolved particle or impurity in medicament pond 1 is avoided to enter main line 5 (diameter 50mm-70mm), the supervisor
The other end on road 5 connects multiple bye-passes 6 (diameter 25mm-30mm), and the bye-pass 6 is spaced apart to be set to spray
The top in place 8 is arranged at intervals with multiple spray heads 7 or bye-pass 6 on each bye-pass 6 using the form of floral tube, bye-pass 6
Setting according to spray place area coverage be configured, can with matts shape be distributed or circular concentric distribution, apart from heap
The diameter of each eyelet of spacing or floral tube between the height and spray head 7 of body 11, which can design, does not do concrete norm, with energy
On enough spray to spray places 11 on the basis of all soil.Wherein the guide of the connection of solution collecting pit 3 solution collection lead layer is blind
Ditch 10 (intercepting ditch 9 of guide french drain 10 convergence and surrounding is indirectly connected with guide french drain 10 by connecting intercepting ditch 9), can incite somebody to action
Derived waste collection in guide french drain 10, and connect sewage treatment equipment 2 and carry out wastewater treatment, the processing of sewage treatment equipment 2
Water afterwards, which is dissolved into medicament pond 1, makees solvent, and sewage treatment equipment 2 generally comprises medicament reaction tank, and some sodium hydroxides are added
Or lime, Cr VI is precipitated to form bed mud, carries out sludge treatment, clear water reuse.
Spray place provided by the present embodiment is suitable for various heavy-metal contaminated soil renovation techniques and non-volatility
Organic pollutant contaminated soil remediation technique is particularly suitable for hexavalent chromium polluted soil remediation technique, repairing hexavalent chromium polluted soil
Earth renovation technique can be using the technique that chemical leaching Yu the repairing hexavalent chromium polluted soil of electronation is used in combination, such as Fig. 2 institute
Show, specifically comprises the following steps:
1) leakage preventing structure for building spray place provided by the utility model is successively from top to bottom that solution collects guide
Layer, film up-protective layer, main impervious barrier, film lower protective layer and basal layer, the spray place have relatively good leakage preventing structure, can
Avoid secondary pollution；
The solution collects lead layer by guide french drain 10 in field (completely paving rubble, guide floral tube), 9 and of surrounding intercepting ditch
Concrete topping is constituted；Wherein guide french drain 10 is formed among concrete topping, and surrounding intercepting ditch 9 is formed in concrete topping
Surrounding.
The film up-protective layer can select geotextiles or bentonite blanket, select 600g/m in this example2Nonwoven geotechnique
Cloth is as film up-protective layer；
HDPE geomembrane is selected in the main impervious barrier suggestion, selects 1.5mm thickness HDPE geomembrane as master in this example
Impervious barrier；
The film lower protective layer can select clay, geotextiles or bentonite blanket, select 600g/m in this example2Nothing
Geotextiles are spun as film lower protective layer；
The basal layer needs to be compacted and guarantee the smooth of surface.
2) contaminated soil pre-processes and builds heap: carrying out crushing and screening to the contaminated soil digged up clearly.It is used in this example
The crushing and screening of ALLU crushing and screening bucket progress contaminated soil.Contaminated soil is transported to spray place constructed by step 1)
Heap is built on 11, forms heap body 11, and height is preferably 2~5m.
3) spray system in the spray place of the utility model is laid above heap body 11, as shown in Figure 1, comprising: medicament
Pond 1, spray pipeline, the pump housing 16 and solution collecting pit 3 etc..The spray pipeline include the main line 5 of diameter 50mm-70mm with
And diameter is the bye-pass 6 of 25mm-30mm.The medicament pond 1 connects 5 one end of main line by the pump housing 16, will by the pump housing 16
Compound pump in medicament pond 1 enters in main line, while check-valves 14, flowmeter 15 are provided on the main line, the pump housing 16
Both ends are provided with entrance door 17 and outlet portal 18, to form the switch of main line 5, while being additionally provided with filter 12, avoid medicine
Undissolved particle or impurity enter main line 5 (diameter 50mm-70mm) in agent pond 1, and the other end connection of the main line 5 is more
A bye-pass 6 (diameter 25mm-30mm), the bye-pass 6 top spaced apart for being set to spray place 8, Ge Gezhi
Multiple spray heads 7 or bye-pass 6 are arranged at intervals on pipeline 6 using the form of floral tube, the setting of bye-pass 6 is according to spray place
Area coverage be configured, can with matts shape be distributed or circular concentric distribution, height and spray head 7 apart from heap body 11
Between spacing or the diameter of each eyelet of floral tube can design and do not do concrete norm, can spray on spray place 11
On the basis of all soil.Wherein solution collecting pit 3 connect solution collect lead layer guide french drain 10 (guide french drain 10 convergence with
The intercepting ditch 9 of surrounding is indirectly connected with guide french drain 10 by connecting intercepting ditch 9), it can will be derived outward in guide french drain 10
Waste collection, and connect sewage treatment equipment 2 and carry out wastewater treatment, treated that water is dissolved into medicament pond 1 for sewage treatment equipment 2
In make solvent, sewage treatment equipment 2 generally comprises medicament reaction tank, and some sodium hydroxides or lime is added, Cr VI is sunk
It forms sediment to form bed mud, carries out sludge treatment, clear water reuse.
4) prepare leacheate in medicament pond, leacheate can be tap water in step 5), inorganic acid, Organic Acid and Base or
The salting liquids such as person's sodium carbonate can also make the reducing agent in step 6).By making in contaminated soil toward eluent is sprayed on mound
Water solubility and acid-alkali salt dissolubility Cr VI be transferred in solution, and the Cr VI after reduction is transferred in solution, is passed through
Solution is collected lead layer and is imported in solution collecting pit, and waste water is can return to after processing for preparing leacheate.
5) implement leacheate spray, spraying intensity is preferably 10~40L/m2·h.During spray, at regular intervals
Sample detection.Hexavalent chromium concentration remaining in hexavalent chromium concentration in leachates, soil is monitored, according to monitoring analysis as a result,
The regime of agent and spray system of spray are set.
Preferably regime of agent and spray system it is as follows: the stage spray process include sequentially carry out using water as leaching
The spray process and inorganic acid (such as sulfuric acid) of washing lotion, organic acid (such as citric acid or oxalic acid), alkali (such as sodium hydroxide) or carbon
Spray process of the salting liquids such as sour sodium as leacheate (i.e. acid-alkali salt is as leacheate).Wherein, spray of the water as leacheate
Process can be omitted and directly carry out spray process of the acid-alkali salt as leacheate.
Wherein each stage spray process carries out data monitoring, according to process monitoring data, when hexavalent chromium removal rate reaches
When to 25% or more, stops water as the spray process of leacheate and enter spray process of the acid-alkali salt as leacheate, according to
Process monitoring data stop spray process of the acid-alkali salt as leacheate, simultaneously when hexavalent chromium removal rate reaches 70% or more
Judge whether hexavalent chromium concentration reaches reparation target in soil extract, if so, stopping repair procedure, completes entire technique stream
Journey carries out next step if not being.
Wherein leacheate ingredient used by each stage does not constrain, and concentration does not also standardize, as long as being able to satisfy each
The medicament of the spray target in stage may be selected.Spray process and acid-alkali salt spray as leacheate of the water as leacheate
The setting of the hexavalent chromium removal rate of journey can be determined according to the factors such as monitoring result and the economic benefit of actual motion.It is gone back in spray
During former agent, (remaining hexavalent chromium concentration can be with every two days sample detections in contaminated soil for sample detection at regular intervals
Once, leachates can sample daily detects twice), it is dense to Cr VI remaining in hexavalent chromium concentration in leachates, contaminated soil
Degree is monitored.
Cr VI total amount is 5670mg/kg in soil used in the present embodiment, wherein water soluble hexavalent chromium accounting
22.75%, acid soluble hexavalent chromium accounting 40.92%, the present embodiment is according to contaminated soil property and small-scale experiment early period design fortune
Capable regime of agent and spray system, spraying intensity 20L/m2H or so.First stage sprays the selection of process leacheate originally
Water, when hexavalent chromium removal rate reaches 25% or more, stops first stage spray process and opens according to process monitoring data
Second stage sprays process.Second stage spray process is changed to spray and compounds environmentally protective salting liquid (such as sodium carbonate and sulfuric acid
The mixed solution of sodium, wherein the mass ratio of sodium carbonate and sodium sulphate meets between 3:1-5:1, the sodium carbonate in specific mixed solution
Do not standardize, can be constantly adjusted according to elution effect with the concentration of sodium sulphate) as elution medicament, according to process monitoring number
According to when hexavalent chromium removal rate reaches 70% or more, stopping second stage spraying process, and soil leaches hexavalent chromium concentration and is not up to
It repairs target (hexavalent chromium concentration is lower than 0.5mg/L in leachate) and enters next step.
6) after water-soluble and acid, alkali, salt dissolubility Cr VI remove substantially in soil original sample, to reduce remnants six in soil
The risk of valence chromium prepares reducing solution in medicament pond, carries out the spray of reducing agent, and reducing agent can be ferrous sulfate, sulfurous acid
Sodium, sodium hydrogensulfite, sodium pyrosulfite etc. restore medicament, according to process monitoring data, at regular intervals sample detection (pollution
Remaining hexavalent chromium concentration can be primary with every two days sample detections in soil, and leachates can sample daily to be detected twice), work as soil
After leaching hexavalent chromium concentration satisfaction reparation target, stop spray.By toward reducing agent is sprayed on mound, for the dirt for being difficult to remove
Object, pollutant remaining in soil are contaminated, the use of reduction means by hexavalent chrome reduction remaining in contaminated soil is hypotoxicity, low moves
The trivalent chromium of shifting property, realizes the thorough removing toxic substances of contaminated soil.
Using ferrous sulfate solution, (common chemical field uses concentration to the reducing agent, and concentration is not advised in the present embodiment
Model, and the concentration of the solution is constantly adjusted in repair process according to monitoring data) as reduction medicament, according to process monitoring number
According to repairing target when Cr VI total amount in soil and soil leach hexavalent chromium concentration and meets (hexavalent chromium concentration be lower than in leachate
After 0.5mg/L), stop phase III spray.
In the present embodiment, after spray operation 1 month, final soil is using " solid waste Leaching leaching method overturning
Method " (GB5086.1-1997) prepare leachate, and hexavalent chromium concentration is lower than 0.5mg/L in leachate, reaches reparation target.It is preferred that
, step 5) and 6) in operating parameter (type and concentration of time, spraying intensity, leacheate including spray etc.) should basis
Process monitoring data carry out adjusting and optimizing appropriate.The early period of technique is reduced by spray place shower water or other eluents
The later period of the total amount of pollutant in dregs, technique is further to remaining hexavalent chromium polluted carry out by spray place spray reducing agent
Detoxified treatment.Heap spray is built while concentrating reduction stabilization technology and chemical leaching technical advantage in spray place, avoids
The problem of it is individually present.By spray place provided by the utility model, design collects lead layer, realizes leacheate
It is automatic to collect guide, it avoids and is separated by solid-liquid separation difficult problem in chemical leaching, reduce the destruction and loss of soil matrix, together
When spray liquid be recycled after processing, greatly reduce water consumption, saved resource.The leaching that the utility model passes through early period
Washing lotion spray removes most water soluble hexavalent chromiums and part acid soluble hexavalent chromium, uses reducing agent for remaining Cr VI
The mode of spray carries out electronation stabilisation, compared to medicament and dregs mix, using reduction liquid medicine circulated sprinkling work
The reduction of skill Cr VI is more thorough, simultaneously because reducing in advance a large amount of hexavalent chromium polluted, also greatly reduces reduction
The use of medicament, reduces environmental risk.
Chemical leaching, electronation or chemical oxidation are specifically used during soil remediation, are to remove or stablize
Change, depends primarily on the operating parameters such as spray medicament and the spraying intensity of our selections.Collocation uses the spray of the utility model
Place can be used as an important technological means during process implementing using dump leaching elution technique, practical new by this
Type provide spray place, be carried out dump leaching elution technique, and realize heavy metal or organic pollutant removal and surely
Fixedization.
The above is only the preferred embodiments of the utility model, are not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (7)
1. a kind of spray place suitable for contaminated soil remediation technique, which is characterized in that the spray place has antiseepage knot
Structure from top to bottom successively includes that solution collects lead layer, film up-protective layer, main impervious barrier, film lower protective layer and basal layer, described
Solution collect lead layer be made of concrete topping；Guide french drain in field is provided in the concrete topping, surrounding is provided with
Intercepting ditch；The film up-protective layer selects geotextiles or bentonite blanket；The main impervious barrier selects HDPE geomembrane；It is described
Film lower protective layer select clay, geotextiles or bentonite blanket；The basal layer is to handle through overcompaction and surfacing
Surface layer.
2. the spray place according to claim 1 suitable for contaminated soil remediation technique, which is characterized in that the spray
It also arranges in pairs or groups and is provided with spray system in place.
3. the spray place according to claim 2 suitable for contaminated soil remediation technique, which is characterized in that the spray
System includes medicament pond, spray pipeline, the pump housing and solution collecting pit；The spray pipeline includes main line and bye-pass,
The medicament pond connects main line one end by the pump housing, is entered the compound pump in medicament pond in main line by the pump housing, the master
The pipeline other end connects multiple bye-passes, and the bye-pass is set to the top in spray place, is spaced setting on each bye-pass
There are multiple spray heads or the bye-pass using floral tube form, the guide that the solution collecting pit connection solution collects lead layer is blind
Ditch, can be by waste collection derived in guide french drain, and connects sewage treatment equipment and carry out wastewater treatment, sewage treatment equipment
Treated, and water is dissolved into reuse in medicament pond.
4. the spray place according to claim 3 suitable for contaminated soil remediation technique, which is characterized in that the supervisor
Road is provided with check-valves.
5. the spray place according to claim 3 suitable for contaminated soil remediation technique, which is characterized in that the supervisor
Road is provided with filter.
6. the spray place according to claim 3 suitable for contaminated soil remediation technique, which is characterized in that the supervisor
The diameter on road is 50mm-70mm, selects UPVC, PE or PPR pipe.
7. the spray place according to claim 3 suitable for contaminated soil remediation technique, which is characterized in that the branch pipe
The diameter on road is 25mm-30mm, and PE is selected to manage, and branch pipe uses convenient for the soft of spray head cloth point is dismantled and adjusted in operation
Pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821405231.0U CN208840200U (en) | 2018-08-29 | 2018-08-29 | Spray place suitable for contaminated soil remediation technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821405231.0U CN208840200U (en) | 2018-08-29 | 2018-08-29 | Spray place suitable for contaminated soil remediation technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110961449A (en) * | 2019-12-25 | 2020-04-07 | 北京矿冶科技集团有限公司 | Soil leaching system and soil leaching method |
-
2018
- 2018-08-29 CN CN201821405231.0U patent/CN208840200U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110961449A (en) * | 2019-12-25 | 2020-04-07 | 北京矿冶科技集团有限公司 | Soil leaching system and soil leaching method |
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