CN106216368B - One kind containing Cr6+Contaminated soil processing unit and its method - Google Patents

One kind containing Cr6+Contaminated soil processing unit and its method Download PDF

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Publication number
CN106216368B
CN106216368B CN201610607258.7A CN201610607258A CN106216368B CN 106216368 B CN106216368 B CN 106216368B CN 201610607258 A CN201610607258 A CN 201610607258A CN 106216368 B CN106216368 B CN 106216368B
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soil
hydrocyclone
contaminated soil
water
vibration
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CN106216368A (en
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高旭光
周晓峰
邱建超
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Qingdao Institute of Bioenergy and Bioprocess Technology of CAS
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Qingdao Institute of Bioenergy and Bioprocess Technology of CAS
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/02Extraction using liquids, e.g. washing, leaching, flotation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/08Reclamation of contaminated soil chemically

Abstract

The invention discloses one kind to contain Cr6+Contaminated soil processing unit, including wet vibration grading machine, hydrocyclone I, blender, hydrocyclone II, vibration dehydrating device;The wet vibration grading machine is connected by conveyance conduit with hydrocyclone I, the hydrocyclone I is connected by blender with hydrocyclone II, hydrocyclone II is connected with vibration dehydrating device, and hydrocyclone I passes through precipitation tank with hydrocyclone II and connects with filter-press;The vibration dehydrating device is sequentially connected a blender and secondary mixer;The wet vibration grading machine is connected by water pipe with supplement water storage tank.It is open to contain Cr6+Contaminated soil processing method selects the complex technique of " soil washing+electronation+fixation " effectively to realize soil sanitation using soil sanitation condition economically and efficiently.

Description

One kind containing Cr6+Contaminated soil processing unit and its method
Technical field
The invention belongs to contaminated soil processing technology fields, and in particular to one kind contains Cr6+Contaminated soil processing unit and its Method.
Background technique
Due to swift and violent economic development and the industrialization thus caused, the serious ring caused by various pollutants matter occurs Border pollution.Especially China obtains fast development economically on behalf of starting point with nineteen ninety, but to the dirt that industrial activity causes Processing and the recycling for contaminating substance be not good enough.
The current trends of developed country headed by the U.S. are, from the post-processing technology of the first generation preventing by the second generation Pollution technology just enters the depollution of environment technology of the third generation recently, and is purification, the soil of regeneration of contaminated and underground water investment Cleaning market scale 1994 of huge financial resources and manpower, whole world contaminated soil and underground water are 14,300,000,000 dollars, 1998 It is 19,500,000,000 dollars, reaches within 2001 23700000000 dollars and just continue to increase.On the contrary, with wherein domestic soil and underground water pollution journey The seriousness of degree is compared, and the exploitation of depollution of environment technology and actual field usable condition are but very insufficient, to the practical of the technology Change horizontal very low.Therefore in order to protect environment and safeguard national health, it is badly in need of the effective purification of exploitation, repairs contaminated material The technology of contaminated soil and underground water.
In China cure of Soil pollution be the by-product that will occur after industrial activity not over treatment process appropriate at Reason, and arbitrarily discharge so that Soil Surrounding etc. has been contaminated or has been in contaminated state i.e..In particular, in polluter In contain micro heavy metal when, persistently release will cause natural ecosystem predator chain upset and bioaccumulation occurs (bioaccumulation), and human pathology's phenomenon or toxicity occurs to cause problem.It is wherein representational at home Pollution sources Cr VI is dispersed in 21 about 5,000,000 tons of area contaminated soils.
Averagely there is 100ppm or so as component in the earth's crust as rarer metal in chromium, and in soil In there are 20ppm concentration.Contain the chromium of about 2-3000ppm in ore, the source ore commercially most widely utilized is chrome ore (chromite), chromite (FeCr2O4) etc..Due to industrial activity chromium flows out to environment and polluted surface and underground water, it is especially main Wanting pollution sources is the pollution of the chromium dissolved out in silver metal mine.It is reported that chromium detects 84 μ g/l in surface water and in underground water 50 μ g/l of middle detection (U.S.EPA, 1987).It is closed with the chromaking of the trivalents such as its chromium oxide (chrome green, chrome green), chromium hydroxide Object is compared, and chromium compound, that is, chromic acid (chromium trioxide) of sexavalence, chromate, bichromate etc. are readily permeable mucocutaneous, to life The influence for ordering body is big, and is changed into trivalent in life entity.Usual Cr6+Compound ratio Cr3+Toxicity of compound is strong.The toxicity of chromium Mainly originate from Cr6+.Cause liver, nephropathy, internal haemorrhage, respiratory disorder, causes vomiting etc. as acute symptom.Because polluting model Enclose wide and impacted polluter that is big, therefore managing concentratedly very early at every country.Technique for fixing to inorganic substances and The obvious processing effect of radioactive substance generally can also be applied in the purification in the area polluted non-halogen and halogen SVOCs. However it is bad to volatile organic contaminant matter and the clean-up effect of oils and gunpowder class, especially to containing Cr6+At contaminated soil It is poor to manage effect.To the treatment Countermeasures of soil pollution, the case where according to pollution level, diffusion, geology, surrounding area, land use The nature such as plan, social condition, should select optimal method.Therefore how according to the presence limitation of polluter applicable technology Situation and select purification techniques, have important practical significance.
Summary of the invention
Contain Cr for existing in the prior art6+The technical issues of contaminated soil poor processing effect, the purpose of the present invention exists It is a kind of containing Gr in providing6+Contaminated soil processing method.
The technical scheme adopted by the invention is as follows:
One kind containing Cr6+Contaminated soil processing unit, including wet vibration grading machine, hydrocyclone I, blender, waterpower Cyclone II, vibration dehydrating device;The wet vibration grading machine is connected by conveyance conduit with hydrocyclone I, the water Power cyclone I is connected by blender with hydrocyclone II, and hydrocyclone II is connected with vibration dehydrating device, hydraulic cyclone Device I passes through precipitation tank with hydrocyclone II and connects with filter-press;The vibration dehydrating device, which is sequentially connected, once to be stirred Mix machine and secondary mixer;The wet vibration grading machine is connected by water pipe with supplement water storage tank.
Further, it is provided with sieve plate in the wet vibration grading machine, sieve plate upper surface is set as diamond shape sieve, diamond shape The lower section intersection position of sieve is arranged in parallel with manages every hole, and sieve plate two sides are provided with tilting baffle, tilting baffle it is following Edge is provided with two rows of spray apertures being staggered in parallel, and spray apertures are connected by water pipe with high-pressure hydraulic pump.
Further, the continous way contaminated soil of the wet vibration grading machine and hydrocyclone I composition is washed for the first time Wash device;Second of wash mill of continous way contaminated soil of the blender and hydrocyclone II composition, sets in blender It is equipped with high pressure spray tracheae.
Further, it is provided with vortex finder in the hydrocyclone I and hydrocyclone II, 3.0mm is below Small soil is husky to carry out partial size separation by hydrocyclone, and the small soil of 0.15mm pollution below is husky to pass through water with pollution washing water The vortex finder of power cyclone is moved in precipitating and neutralization chamber.
One kind containing Cr6+Contaminated soil processing method, specifically comprises the following steps:
(1) soil cleans for the first time: taking contaminated soil, is placed into the wet vibration grading machine of soil first time wash mill Sieve plate on, according to the volume ratio 1:3 of contaminated soil and water, to contaminated soil spray washing liquid, mixed material passes through waterpower and revolves Stream device I is centrifuged, and obtains soil I and the waste water I containing polluter;
(2) the soil I that hydrocyclone I is handled in step (1) soil I secondary washing: is placed into soil second In secondary wash mill, it is 1:1 according to the volume ratio of water and soil, adds water into the blender of second of wash mill of soil, Addition is according to Cr in contaminated soil simultaneously6+The hydrochloric acid that 10 times of equivalent, stirs 10-20min, and mixed material passes through hydrocyclone II It is centrifuged, obtains soil II and the waste water II containing polluter;
(3) wastewater treatment: by step (1) hydrocyclone I the waste water I handled and step (2) hydrocyclone II It handles obtained waste water II to be placed into precipitation tank, addition and the comparable NaOH solution of hydrochloric acid dosage and pollution into precipitation tank Cr in soil6+Identical centinormal 1 ferrous sulfate precipitates 2-2.5h, and the filtrate being obtained by filtration, which is placed into filter-press, to be pressed Filter, the water that obtains that treated and partial size are 0.075mm soil below;
(4) soil II is once stirred: step (2) hydrocyclone II soil II handled is placed into vibration dehydration In device, dehydration obtains soil III and the waste water III containing polluter, is 1:4, Xiang Zhendong according to the volume ratio of water and soil Soil in dehydration device adds water, while adding according to Cr in contaminated soil6+The ferrous sulfate that 3 times of equivalent, uniform stirring 0.5-0.8h;
(5) soil II secondary agitation: in the soil III in step (4) after stirring, according to Cr in soil III6+3 times of equivalent Potassium phosphate, stir 0.5-0.8h, filtering, obtain partial size be 0.075mm-3mm purification soil.
Further, the screening partial size of wet vibration grading machine is 3.0mm in the step (1), and 3.0mm soil below is husky It is injected into mixed stirring device, the gravel of 3.0mm or more is separated into peace and quiet gravel discharge.
Further, the waste water III that processing obtains in the step (4) is placed into precipitation tank, is added into precipitation tank The NaOH and contaminated soil Cr of contaminated soil and hydrochloric acid dosage comparable 5%6+Quite centinormal 1 5% ferrous sulfate, 2-2.5h is precipitated, the filtrate being obtained by filtration is placed into filters pressing in filter-press, and the waste water and partial size for obtaining high pollution concentration are 0.075mm soil below.
Further, the additional amount of HCl is Cr in contaminated soil in the step (2)6+10 times of equivalent;In step (2) The additional amount of NaOH is suitable with the additional amount of HCl.
The invention has the benefit that
Washing technology in the present invention uses the most suitable size controlling of contaminated soil in the sand and gravel of 0.25mm or more When, the effect of washing technology can be played to the utmost, and volume is washed there are when 0.25mm or less small silty sand and clay Efficiency will greatly improve.
Soil treatment technique of the invention has selected " soil washing (3 times) using economy and efficiency as most suitable technology The complex technique of+electronation+fixation " has selected soil washing to use distilled water, chlorination as the reagent used in the art Hydrogen;Electronation uses ferrous sulfate;Electronation: hexavalent chrome reduction is removed to be precipitated as hydroxide after trivalent.Sulphur Equal acidulants or Fe2+Equal reducing agents promote Cr6+It is reduced to Cr3+Reaction.Promote to release Fe from soil under acid state2+From And restore Cr6+
The present invention be first washed with distilled water it is primary after, then with hydrochloric acid reduce pollution concentration, while playing the work for reducing pH value With.It is reduced to trivalent using ferrous sulfate after the soil washing stage, finally potassium phosphate product is recycled to carry out fixed skill Art.The soil statutory standards 30mg/kg for not only having met China, but also soil sanitation condition economically and efficiently can be had selected, expense is reduced With.
After carrying out once washing using distilled water, it washed once again using hydrogen chloride.Hereafter it has carried out again sub- using sulfuric acid The electronation technology of iron and the technique for fixing for utilizing potassium phosphate.The liquid-solid ratio of contaminated soil and solution is made into 1:3, every 30 points Clock has carried out the running time stage by stage.Using soil sanitation device as a result, final hexavalent chromium concentration is legal lower than China Standard 30mg/kg.
The structure that the equipment that the present invention uses is equipped for large capacity is sorted due to carrying out wet vibration when washing first time Containing a large amount of washing water in the soil sand occurred afterwards, smoothly isolated with waste water so that vibration dehydrating device be arranged, at second In the blender of wash mill, supplement is provided with precipitation tank, i.e. reactive tank, to be washed twice and reduce pollutant Matter;Stirring for the first time has used continuous process without using batch mode with second of stirring, so that engineering when large volume handling Keep fair current.
Reprocessing operates engineering advantageous after first storage stays at one when processing low capacity when washing water process, but handles great Rong Need all to handle the washing water of generation and regenerate use when amount, therefore application continuous process supplements, and riffler is arranged thus The small soil that processing flows into is husky, and the fine soil Sha Zeyong solid-liquid separator for being deposited on lower part is removed.Continuous setting processing sexavalence The redox slot of chromium waste water, so as to be purged at any time along the water flow flowed into.
Hexavalent chromium-treatments in washing water are in acid condition, i.e. 3 or less pH value carries out, without adding special drug, The washing water that the washing water occurred for the first time occurs with second need to only be mixed and be adjusted to acid condition again, so that it may reduce adjusting Drug expenditure needed for pH value.Ferrous sulfate is added in reduction cell, is formed in neutralization chamber clear in precipitation tank after hydroxide It removes.However the defect (pH value is adjusted to strong basicity) on equipment is likely to occur in neutralization chamber, so that setting is stirred for the second time It mixes after slot adjusts pH value again and is transplanted on precipitation tank.
Detailed description of the invention
Fig. 1 is soil treatment process flow chart in the present invention.
1, wet vibration grading machine;2, hydrocyclone I;3, blender;4, hydrocyclone II;5, vibration dehydration dress It sets;6, a blender;7, secondary mixer;8, precipitation tank;9, filter press;10, water storage tank is supplemented.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawing.
Embodiment 1
One kind containing Cr6+Contaminated soil processing unit, including wet vibration grading machine, hydrocyclone I, blender, waterpower Cyclone II, vibration dehydrating device;The wet vibration grading machine is connected by conveyance conduit with hydrocyclone I, the water Power cyclone I is connected by blender with hydrocyclone II, and hydrocyclone II is connected with vibration dehydrating device, hydraulic cyclone Device I passes through precipitation tank with hydrocyclone II and connects with filter-press;The vibration dehydrating device, which is sequentially connected, once to be stirred Mix machine and secondary mixer;The wet vibration grading machine is connected by water pipe with supplement water storage tank.
The structure that the equipment that the present invention uses is equipped for large capacity is sorted due to carrying out wet vibration when washing first time Containing a large amount of washing water in the soil sand occurred afterwards, smoothly isolated with waste water so that vibration dehydrating device be arranged, at second In the blender of wash mill, supplement is provided with precipitation tank, i.e. reactive tank, to be washed twice and reduce pollutant Matter;Stirring for the first time has used continuous process without using batch mode with second of stirring, so that engineering when large volume handling Keep fair current can be to the utmost using the most suitable size controlling of contaminated soil in the sand and gravel of 0.25mm or more The effect of washing technology is played, there are when 0.25mm or less small silty sand and clay, detersive efficiency will be greatly reduced volume.
Embodiment 2
On the basis of embodiment 1, it distinguishes in the technical solution with embodiment 1, above-mentioned wet vibration grading machine and waterpower The continous way contaminated soil first time wash mill of cyclone I composition;The blender and hydrocyclone II form continuous Second of wash mill of formula contaminated soil is provided with high pressure spray tracheae in blender, washs object soil together with HCl detergent It knocks down in the hopper of wash mill, carries out physical mixed and chemical reaction and remove polluter, soil is husky in first time washing dress Mixing, washing water is husky with Polluted Soil in the wet vibration grading machine set and is transplanted in device, in the stirring of second of wash mill The turbulent flow that high pressure spray tracheae carries out strength is set in machine.
Embodiment 3
On the basis of embodiment 1, it distinguishes in the technical solution with embodiment 1, sieve is provided in wet vibration grading machine Plate, sieve plate upper surface are set as diamond shape sieve, and the lower section intersection position of diamond shape sieve is arranged in parallel with manages every hole, and sieve plate two sides are set It is equipped with tilting baffle, the lower edge of tilting baffle is provided with two rows of spray apertures being staggered in parallel, and spray apertures pass through water Pipe is connected with high-pressure hydraulic pump.The structure setting and baffle arrangement of diamond shape sieve on sieve plate, must when ensure that granule materials screening The requirement that compass screen surface is translatable along compass screen surface flat must be invested, error-sifting rate is reduced, solves the problems, such as that granule materials error-sifting rate is big, screening is difficult, together When to solve the problems, such as that traditional shaker direction of vibration is difficult to ensure accurate, and then improve screening efficiency.
Embodiment 4
On the basis of embodiment 1, it distinguishes in the technical solution with embodiment 1, above-mentioned hydrocyclone I and hydraulic cyclone It is provided with vortex finder in device II, the behavior of slurry improves water in the boundary layer by influencing logistics detector outer surface The performance of power cyclone.Cause the separation in boundary layer, thus sidewall surfaces free edge region fluid flowing provide overflow and Boundary layer flow efficiently separates.3.0mm small soil below is husky to carry out partial size separation by hydrocyclone, and 0.15mm is below Small soil sand is polluted to be moved in precipitation tank and neutralization chamber with pollution washing water by the vortex finder of hydrocyclone.
Embodiment 5
As shown in Figure 1, a kind of contain Cr6+Contaminated soil processing method, specifically comprises the following steps:
(1) soil cleans for the first time: taking contaminated soil, is placed into the wet vibration grading machine of soil first time wash mill Sieve plate on, according to the volume ratio 1:3 of contaminated soil and water, to contaminated soil spray washing liquid, mixed material passes through waterpower and revolves Stream device I is centrifuged, and obtains soil I and the waste water I containing polluter;
The screening partial size of wet vibration grading machine is 3.0mm in the step (1), and 3.0mm native sand below is injected into Mixed stirring device, the gravel of 3.0mm or more are separated into peace and quiet gravel discharge.
(2) the soil I that hydrocyclone I is handled in step (1) soil I secondary washing: is placed into soil second In secondary wash mill, it is 1:1 according to the volume ratio of water and soil, adds water into the blender of second of wash mill of soil, Addition is according to Cr in contaminated soil simultaneously6+The hydrochloric acid that 10 times of equivalent, stir 10min, mixed material by hydrocyclone II into Row centrifuge separation, obtains soil II and the waste water II containing polluter;
The additional amount of HCl is Cr in contaminated soil in the step (2)6+10 times of equivalent;The addition of NaOH in step (2) Amount is suitable with the additional amount of HCl.
(3) wastewater treatment: by step (1) hydrocyclone I the waste water I handled and step (2) hydrocyclone II It handles obtained waste water II to be placed into precipitation tank, addition and the comparable NaOH solution of hydrochloric acid dosage and pollution into precipitation tank Cr in soil6+Identical centinormal 1 ferrous sulfate, precipitates 2h, and the filtrate being obtained by filtration is placed into filters pressing in filter press, obtains Treated water and partial size are 0.075mm soil below;
(4) soil II is once stirred: step (2) hydrocyclone II soil II handled is placed into vibration dehydration In device, dehydration obtains soil III and the waste water III containing polluter, is 1:4, Xiang Zhendong according to the volume ratio of water and soil Soil in dehydration device adds water, while adding according to Cr in contaminated soil6+The ferrous sulfate that 3 times of equivalent, uniform stirring 0.5h;
The waste water III that processing obtains in the step (4) is placed into precipitation tank, added into precipitation tank contaminated soil with The NaOH and contaminated soil Cr of hydrochloric acid dosage comparable 5%6+Quite centinormal 1 5% ferrous sulfate precipitates 2h, filtering Obtained filtrate is placed into filters pressing in filter press, and the waste water and partial size for obtaining high pollution concentration are 0.075mm soil below.
(5) soil II secondary agitation: in the soil III in step (4) after stirring, according to Cr in soil III6+3 times of equivalent Potassium phosphate, stir 0.5h, filtering, obtain partial size be 0.075mm-3mm purification soil.
Embodiment 6
As shown in Figure 1, a kind of contain Cr6+Contaminated soil processing method, specifically comprises the following steps:
(1) soil cleans for the first time: taking contaminated soil, is placed into the wet vibration grading machine of soil first time wash mill Sieve plate on, according to the volume ratio 1:3 of contaminated soil and water, to contaminated soil spray washing liquid, mixed material passes through waterpower and revolves Stream device I is centrifuged, and obtains soil I and the waste water I containing polluter;
The screening partial size of wet vibration grading machine is 3.0mm in the step (1), and 3.0mm native sand below is injected into Mixed stirring device, the gravel of 3.0mm or more are separated into peace and quiet gravel discharge.
(2) the soil I that hydrocyclone I is handled in step (1) soil I secondary washing: is placed into soil second In secondary wash mill, it is 1:1 according to the volume ratio of water and soil, adds water into the blender of second of wash mill of soil, Addition is according to Cr in contaminated soil simultaneously6+The hydrochloric acid that 10 times of equivalent, stir 20min, mixed material by hydrocyclone II into Row centrifuge separation, obtains soil II and the waste water II containing polluter;
The additional amount of HCl is Cr in contaminated soil in the step (2)6+10 times of equivalent;The addition of NaOH in step (2) Amount is suitable with the additional amount of HCl.
(3) wastewater treatment: by step (1) hydrocyclone I the waste water I handled and step (2) hydrocyclone II It handles obtained waste water II to be placed into precipitation tank, addition and the comparable NaOH solution of hydrochloric acid dosage and pollution into precipitation tank Cr in soil6+Identical centinormal 1 ferrous sulfate precipitates 2.5h, and the filtrate being obtained by filtration, which is placed into filter-press, to be pressed Filter, the water that obtains that treated and partial size are 0.075mm soil below;
(4) soil II is once stirred: step (2) hydrocyclone II soil II handled is placed into vibration dehydration In device, dehydration obtains soil III and the waste water III containing polluter, is 1:4, Xiang Zhendong according to the volume ratio of water and soil Soil in dehydration device adds water, while adding according to Cr in contaminated soil6+The ferrous sulfate that 3 times of equivalent, uniform stirring 0.5-0.8h;
The waste water III that processing obtains in the step (4) is placed into precipitation tank, added into precipitation tank contaminated soil with The NaOH and contaminated soil Cr of hydrochloric acid dosage comparable 5%6+Quite centinormal 1 5% ferrous sulfate precipitates 2.5h, mistake It filters obtained filtrate and is placed into filters pressing in filter-press, the waste water and partial size for obtaining high pollution concentration are that 0.075mm is below Soil.
(5) soil II secondary agitation: in the soil III in step (4) after stirring, according to Cr in soil III6+3 times of equivalent Potassium phosphate, stir 0.8h, filtering, obtain partial size be 0.075mm-3mm purification soil.
Pilot scale test result
The hexavalent chromium polluted soil using the pollution of artificial land productivity potassium bichromate at about 500mg/kg concentration is tested for this, The scene for having carried out the continuous soil sanitation device of pilot-scale is applicable in, and it is as follows that the abstract of the experimental result arranges content.
After carrying out once washing using distilled water, it washed once again using hydrochloric acid (HCl).Hereafter it has carried out utilizing sulfuric acid again Ferrous electronation technology and the technique for fixing using potassium phosphate.The liquid-solid ratio of contaminated soil and solution is made into 1:3, every 30 Minute has carried out the running time stage by stage.Using soil sanitation device as a result, final hexavalent chromium concentration be 14.83mg/kg, To meet the statutory standards 30mg/kg of China.
Mass balance
Based on the applicable result in the scene of the continuous soil sanitation device of pilot-scale, mass balance is set, but just On the basis of phase concentration about 489mg/kg as measurement result, for the removing and shifting of polluter present in clear 1 ton of soil It is dynamic and implementation.
The above is not limitation of the present invention, it should be pointed out that: those skilled in the art are come It says, under the premise of not departing from essential scope of the present invention, several variations, modifications, additions or substitutions can also be made, these improvement It also should be regarded as protection scope of the present invention with retouching.

Claims (8)

1. one kind contains Cr6+Contaminated soil processing method, which is characterized in that specifically comprise the following steps:
(1) soil cleans for the first time: take contaminated soil, be placed on the sieve plate of wet vibration grading machine, according to contaminated soil and The volume ratio 1:3 of water, to contaminated soil spray washing, mixed material is centrifuged by hydrocyclone I, obtains soil I and waste water I containing polluter;
(2) soil I secondary washing: the soil I that hydrocyclone I is handled in step (1) is placed into blender, according to The volume ratio of water and soil is 1:1, water is added into blender, while adding according to Cr in contaminated soil6+The salt that 10 times of equivalent Acid stirs 10-20min, and mixed material is centrifuged by hydrocyclone II, obtains soil II and containing polluter Waste water II;
(3) wastewater treatment: by step (1) hydrocyclone I the waste water I handled and step (2) hydrocyclone II processing Obtained waste water II is sequentially placed in reduction cell, neutralization chamber and precipitation tank, and Cr in contaminated soil is added in reduction cell6+It is identical Centinormal 1 ferrous sulfate, in neutralization chamber addition with the comparable NaOH solution of hydrochloric acid dosage, formed hydroxide after It is removed in precipitation tank, precipitates 2-2.5h, the filtrate being obtained by filtration is placed into filters pressing in filter press, obtain that treated water and partial size For 0.075mm soil below;
(4) soil II is once stirred: step (2) hydrocyclone II soil II handled is placed into vibration dehydrating device In, dehydration obtains soil III and the waste water III containing polluter, is 1:4 according to the volume ratio of water and soil, is dehydrated to vibration Soil in device adds water, while adding according to Cr in contaminated soil6+The ferrous sulfate that 3 times of equivalent, uniform stirring 0.5- 0.8h;
(5) soil II secondary agitation: in the soil III in step (4) after stirring, according to Cr in soil III6+The phosphorus that 3 times of equivalent Sour potassium, stirs 0.5-0.8h, and filtering obtains the purification soil that partial size is 0.075mm-3mm.
2. a kind of according to claim 1 contain Gr6+Contaminated soil processing method, which is characterized in that wet type in the step (1) The screening partial size for vibrating grading machine is 3.0mm, and 3.0mm native sand below is injected into mixed stirring device, the gravel of 3.0mm or more Stone is separated into peace and quiet gravel discharge.
3. a kind of according to claim 1 contain Gr6+Contaminated soil processing method, which is characterized in that processing in the step (4) Obtained waste water III is sequentially placed in reduction cell, neutralization chamber and precipitation tank, addition and contaminated soil Cr in reduction cell6+Phase When centinormal 1 5% ferrous sulfate, the NaOH with hydrochloric acid dosage comparable 5% is added in neutralization chamber, forms hydroxide It is removed in precipitation tank after object, precipitates 2-2.5h, the filtrate being obtained by filtration is placed into filters pressing in filter press, obtains high pollution concentration Waste water and partial size be 0.075mm soil below.
4. a kind of according to claim 1 contain Gr6+Contaminated soil processing method, which is characterized in that HCl in the step (2) Additional amount be contaminated soil in Cr6+10 times of equivalent.
5. a kind of according to claim 1 contain Gr6+Contaminated soil processing method, which is characterized in that used to contain Cr6+Pollution Soil treatment device, including wet vibration grading machine, hydrocyclone I, blender, hydrocyclone II, vibration dehydrating device; The wet vibration grading machine is connected by conveyance conduit with hydrocyclone I, and the hydrocyclone I passes through blender and water The II connection of power cyclone, hydrocyclone II are connected with vibration dehydrating device, and hydrocyclone I and hydrocyclone II pass through Precipitation tank is connected with filter press;The vibration dehydrating device is sequentially connected a blender and secondary mixer;The wet type vibration Dynamic grading machine is connected by water pipe with supplement water storage tank.
6. a kind of according to claim 5 contain Gr6+Contaminated soil processing method, which is characterized in that the wet vibration sorts Sieve plate is provided in machine, sieve plate upper surface is set as diamond shape sieve, and the lower section intersection position of diamond shape sieve is arranged in parallel with every hole Pipe, sieve plate two sides are provided with tilting baffle, and the lower edge of tilting baffle is provided with two rows of spray apertures being staggered in parallel, Spray apertures are connected by water pipe with high-pressure hydraulic pump.
7. a kind of according to claim 5 contain Gr6+Contaminated soil processing method, which is characterized in that the wet vibration sorts The continous way contaminated soil first time wash mill of machine and hydrocyclone I composition;The blender and hydrocyclone II group At second of wash mill of continous way contaminated soil, be provided with high pressure spray tracheae in blender.
8. a kind of according to claim 5 contain Gr6+Contaminated soil processing method, which is characterized in that the hydrocyclone I and Vortex finder is provided in hydrocyclone II, 3.0mm small soil below is husky to carry out partial size separation by hydrocyclone, The small soil of 0.15mm pollution below is husky to be moved in precipitation tank with pollution washing water by the vortex finder of hydrocyclone.
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CN108723071B (en) * 2018-05-22 2021-01-05 河北省冀信环保科技有限公司 Chromium-containing soil harmless treatment device and treatment method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102601106A (en) * 2012-03-08 2012-07-25 中国科学院过程工程研究所 Ectopic leaching restoring device and restoring method for chromic slag polluted soil
CN203664353U (en) * 2013-12-30 2014-06-25 中新苏州工业园区清城环境发展有限公司 Compound polluted soil treatment equipment
CN104226678A (en) * 2014-09-05 2014-12-24 周昱 Heavy metal contaminated soil remediation method and device thereof
CN104741371A (en) * 2015-04-03 2015-07-01 重庆大学 Contaminated land remediation method
CN204747063U (en) * 2015-04-14 2015-11-11 桑德环境资源股份有限公司 Drip washing repair system is reinforceed to heavy metal chromium -contaminated soil's supersound
CN105057340A (en) * 2015-07-31 2015-11-18 三川德青科技有限公司 Chromium-contaminated soil different-position leaching repairing technology and device
CN105598148A (en) * 2016-02-04 2016-05-25 周益辉 Method for repairing volatile organic matter and heavy metal chromium combined polluted soil
CN105772497A (en) * 2016-04-12 2016-07-20 上海格林曼环境技术有限公司 Soil ectopic leaching restoring complete equipment

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102601106A (en) * 2012-03-08 2012-07-25 中国科学院过程工程研究所 Ectopic leaching restoring device and restoring method for chromic slag polluted soil
CN203664353U (en) * 2013-12-30 2014-06-25 中新苏州工业园区清城环境发展有限公司 Compound polluted soil treatment equipment
CN104226678A (en) * 2014-09-05 2014-12-24 周昱 Heavy metal contaminated soil remediation method and device thereof
CN104741371A (en) * 2015-04-03 2015-07-01 重庆大学 Contaminated land remediation method
CN204747063U (en) * 2015-04-14 2015-11-11 桑德环境资源股份有限公司 Drip washing repair system is reinforceed to heavy metal chromium -contaminated soil's supersound
CN105057340A (en) * 2015-07-31 2015-11-18 三川德青科技有限公司 Chromium-contaminated soil different-position leaching repairing technology and device
CN105598148A (en) * 2016-02-04 2016-05-25 周益辉 Method for repairing volatile organic matter and heavy metal chromium combined polluted soil
CN105772497A (en) * 2016-04-12 2016-07-20 上海格林曼环境技术有限公司 Soil ectopic leaching restoring complete equipment

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