CN103920701B - A kind of restorative procedure of chromium-polluted soil - Google Patents
A kind of restorative procedure of chromium-polluted soil Download PDFInfo
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Abstract
The present invention discloses a kind of restorative procedure of chromium-polluted soil. The method is that chromium-polluted soil is carried out to break process, obtains the chromium-polluted soil that particle diameter is less than 10cm; Chromium-polluted soil after fragmentation adds reducing agent, water, stirs and obtains reducing chromium-polluted soil after treatment; In reducing agent and chromium-polluted soil, chromic mol ratio is 50～400:1,5～25 ﹪ of water and chromium-polluted soil quality; In reduction chromium-polluted soil after treatment, add stable pharmaceutical, stable pharmaceutical is 0.1～20 ﹪ of chromium-polluted soil quality, after stirring, and isolated air, moisture-keeping maintaining 1～3 day. Rehabilitation cost of the present invention is low; Reparation speed is fast; Repairing effect is good; Soil after reparation, adopts strict HJ/T299 sulfuric acid nitrate method to leach, and in leachate, hexavalent chromium concentration is lower than IV class surface water standard; Do not produce secondary pollution.
Description
Technical field
The invention belongs to environmental technology field, relate to a kind of restorative procedure of chromium-polluted soil.
Background technology
Soil Cr is polluted mainly from works such as chrome ore, metal smelt, plating, process hides, pigment and chemical industryIndustry waste water and dregs. Cr VI toxicity is high, animal migration is strong, thereby easily endangers environment, threatens the mankind strongHealth. Chromic toxicity is low and almost precipitate completely in neutral and weakly alkaline solution, thereby to environmentLess with the mankind's harm. Chromium also has a great impact the growth of crops. According to test, in water, containChromium can stimulate plant growth in the time of 1ppm, can make plant growth slow down when 1～10ppm, to 100ppmShi Ze almost makes crop stop growing. In recent years, the ground such as Hunan, Henan, Fujian had all occurred seriouslyPollution of chromium event, cause heavy economic losses and personal injury, caused the leaders' of central and local governmentsPay much attention to.
Administer the technology of chromium-polluted soil have a variety of, mainly contain stabilisation/curing technology, water-washing technique,Phytoremediation technology, electric repairing technique etc. Wherein, water-washing technique is higher mainly for sandstone contentContaminated soil, reduce the treating capacity of contaminated soil compared with low sandstone by separating nontoxic or toxicity,Essence does not reduce the toxicity of soil. Phytoremediation technology can reduce soil Cr content, but canThe floristics repaired for chromium-polluted soil is less and its growth is affected by environment large. In addition, plantRecovery technique also exists harvesting long, plant repair time to process the problems such as difficult, thereby the work of this technologyCheng Yingyong is less. Electric repairing technique is a kind of emerging technology of repairing chromium contaminated soil, can reduceSoil Cr content, but there is the shortcomings such as energy consumption is high, uncertain factor is many, and engineering application is also less.
Comparatively speaking, stabilisation/curing technology is the most practical technology of repairing chromium contaminated soil. This technologyAlthough do not reduce soil Cr content, can greatly reduce the toxicity of soil, be controlled at oneIn individual safe range. In addition, this technology have that remediation efficiency is high, cost is low, workable etc. excellentPoint, thereby engineering application is more. In the last few years, stabilisation/curing technology had had new development, formedChemical stabilization technology. This technology is not used curing agent, thereby less to the increase-volume of soil, andSoil texture after treatment is approaching with original soil, stability is better, can recycle.
Summary of the invention
The object of the invention is, for the deficiencies in the prior art, to propose a kind of reparation side of chromium-polluted soilMethod. The method cost is low, efficiency is high, workable, there is good practicality.
The inventive method comprises the following steps:
Step (1). chromium-polluted soil is carried out to break process, obtain the pollution of chromium that particle diameter is less than 10cmSoil.
Step (2). the chromium-polluted soil after fragmentation adds reducing agent, water, stirs and also obtainsFormer chromium-polluted soil after treatment; In reducing agent and chromium-polluted soil chromic mol ratio be 50～400:1, water is 5～25 ﹪ of chromium-polluted soil quality;
Described reducing agent is one in iron powder, ferrous salt, sulphurizing salt, many sulphurizing salts, sulphiteKind or multiple; Reducing agent can directly join in soil with powder type, or reducing agent can be firstBe dissolved in the water, join in soil with solution form;
Described ferrous salt is ferrous sulfate, ferrous nitrate, frerrous chloride or ferrous carbonate;
The cation of described sulphurizing salt, many sulphurizing salts, sulphite is in sodium, potassium, magnesium, calciumA kind of.
Reducing agent in step (2) can become trivalent chromium by the hexavalent chrome reduction in soil, chemical reactionEquation is as follows:
Trivalent chromium precipitates in neutrality or weakly alkaline environment, generates chromium hydroxide, its chemical reactionEquation is as follows:
3OH-+Cr3+→Cr(OH)3↓(4)
Trivalent chromium also can precipitate with iron ion, ferric hydroxide colloid reaction, its chemical reaction equationFormula is as follows:
xCr3++(1-x)Fe3++3OH-→CrxFe1-x(OH)3↓(5)
Cr3++nFe(OH)x→Cr3+-[Fe(OH)x]n↓(6)
Step (3). in reduction chromium-polluted soil after treatment, add stable pharmaceutical, stable pharmaceutical is0.1～20 ﹪ of chromium-polluted soil quality, after stirring, isolated air, moisture-keeping maintaining 1～3 day.
Described stable pharmaceutical be magnesia, magnesium hydroxide, magnesium carbonate, calcium oxide, calcium hydroxide,One or more in calcium carbonate;
Stable pharmaceutical reduces the animal migration of chromium by the mode such as adsorption, chemical precipitation, thereby reducesThe toxicity of soil; The effect that regulates soil pH value is also played in adding of stable pharmaceutical, makes after treatmentSoil is applicable to plant growth.
The present invention compared with prior art, has following beneficial effect:
(1) rehabilitation cost is low; The medicament that the present invention uses is all common industrial chemical, price is low,Wide material sources; The plant equipment relating to mainly contains excavator, soil breaker and mixer; Every Fang GeThe rehabilitation cost of contaminated soil is lower, if adopt original position repair mode, cost will be lower;
(2) reparation speed is fast; Chemical stabilization technology be repair fastest soil remediation technology itOne; According to the ability to work of soil breaker and mixer, the soil remediation amount of every cover system is 10～50m3/h；
(3) repairing effect is good; Soil after reparation, adopts strict HJ/T299 sulfuric acid nitrate method to soakGo out, in leachate, hexavalent chromium concentration is lower than IV class surface water standard;
(4) do not produce secondary pollution; In whole repair process, do not produce waste water and waste gas, therebyCan not cause secondary pollution to surrounding environment.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 400:1 adds 400mol iron powder by reducing agent and chromic mol ratio. Stir after 2min,Add 20L water, stir 3min. Then, add 0.1kg oxygen by 0.1 ﹪ of chromium-polluted soil qualityChange magnesium, stir 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day,To soil sampling after treatment, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach.Testing result shows: Cr VI leaching concentration drops to after treatment from 20mg/L before treatment0.01mg/L; Total chromium leaching concentration drops to 0.06mg/L after treatment from 25mg/L before treatment.
Embodiment 2
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 8cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 380:1 adds 380mol ferrous sulfate by reducing agent and chromic mol ratio. Stir 3minAfter, add 5L water, stir 4min. Then, add 1kg hydrogen-oxygen by 1 ﹪ of chromium-polluted soil qualityChange magnesium, stir 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day,To soil sampling after treatment, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach.Testing result shows: Cr VI leaching concentration drops to after treatment from 20mg/L before treatment0.015mg/L; Total chromium leaching concentration drops to 0.06mg/L after treatment from 25mg/L before treatment.Embodiment 3
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 350:1 adds 350mol ferrous nitrate by reducing agent and chromic mol ratio. Stir 5minAfter, add 25L water, stir 5min. Then, add 5kg oxygen by 5 ﹪ of chromium-polluted soil qualityChange calcium, stir 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day,To soil sampling after treatment, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach.Testing result shows: Cr VI leaching concentration drops to after treatment from 20mg/L before treatment0.01mg/L; Total chromium leaching concentration drops to 0.06mg/L after treatment from 25mg/L before treatment.
Embodiment 4
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, by roll extrusion fragmentation by soil blockParticle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir on one side, press on one sideReducing agent and chromic mol ratio are that 300:1 adds 300mol frerrous chloride. Stir after 2min,Add 20L water, stir 3min. Then, add 6kg hydroxide by 6 ﹪ of chromium-polluted soil qualityCalcium, stirs 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 2 days, rightSoil sampling after treatment, does Leaching and detects, and adopts HJ/T299 sulfuric acid nitrate method to leach. InspectionSurvey result shows: Cr VI leaching concentration drops to after treatment from 20mg/L before treatment0.01mg/L; Total chromium leaching concentration drops to 0.04mg/L after treatment from 25mg/L before treatment.
Embodiment 5
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 250:1 adds 250mol ferrous carbonate by reducing agent and chromic mol ratio. Stir 2minAfter, add 25L water, stir 3min. Then, add 8kg carbon by 8 ﹪ of chromium-polluted soil qualityAcid calcium, stirs 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day,To soil sampling after treatment, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach.Testing result shows: Cr VI leaching concentration drops to after treatment from 20mg/L before treatment0.015mg/L; Total chromium leaching concentration drops to 0.05mg/L after treatment from 25mg/L before treatment.Embodiment 6
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 240:1 adds 240mol vulcanized sodium by reducing agent and chromic mol ratio. Stir after 4min,Add 15L water, stir 3min. Then, add 4kg magnesia by 4 ﹪ of chromium-polluted soil qualityAdd 3kg magnesium hydroxide with 3 ﹪ by chromium-polluted soil quality, stir 5min. By soil after treatmentEarth is in a huddle, hides with waterproof cloth. After maintenance 3 days, to soil sampling after treatment, do and leach poisonProperty detects, and adopts HJ/T299 sulfuric acid nitrate method to leach. Testing result shows: Cr VI leaching concentrationDrop to 0.017mg/L after treatment from 20mg/L before treatment; Total chromium leaching concentration is from before treatment25mg/L drops to 0.05mg/L after treatment.
Embodiment 7
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 220:1 adds 220mol potassium sulfide by reducing agent and chromic mol ratio. Stir after 2min,Add 20L water, stir 3min. Then, add 3kg magnesium carbonate by 3 ﹪ of chromium-polluted soil qualityAdd 3kg calcium oxide with 3 ﹪ by chromium-polluted soil quality, stir 5min. By soil after treatmentIn a huddle, hide with waterproof cloth. After maintenance 3 days, to soil sampling after treatment, do LeachingDetect, adopt HJ/T299 sulfuric acid nitrate method to leach. Testing result show: Cr VI leaching concentration from20mg/L before treatment drops to 0.011mg/L after treatment; Total chromium leaching concentration is from before treatment25mg/L drops to 0.06mg/L after treatment.
Embodiment 8
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 200:1 adds 200mol magnesium sulfide by reducing agent and chromic mol ratio. Stir after 2min,Add 22L water, stir 3min. Then, add 4kg hydroxide by 4 ﹪ of chromium-polluted soil qualityCalcium and add 4kg calcium carbonate by 4 ﹪ of chromium-polluted soil quality, stirs 3min. By soil after treatmentEarth is in a huddle, hides with waterproof cloth. After maintenance 1 day, to soil sampling after treatment, do and leach poisonProperty detects, and adopts HJ/T299 sulfuric acid nitrate method to leach. Testing result shows: Cr VI leaching concentrationDrop to 0.01mg/L after treatment from 20mg/L before treatment; Total chromium leaching concentration is from before treatment25mg/L drops to 0.06mg/L after treatment.
Embodiment 9
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 180:1 adds 180mol calcium sulfide by reducing agent and chromic mol ratio. Stir after 2min,Add 25L water, stir 3min. Then, add oxidation by 2 ﹪ (2kg) of chromium-polluted soil qualityMagnesium and by 2 ﹪ of chromium-polluted soil quality add 2kg magnesium hydroxide and by chromium-polluted soil quality 2﹪ adds 2kg magnesium carbonate, stirs 3min. By in a huddle soil after treatment, hide with waterproof cloth.After maintenance 2 days, to soil sampling after treatment, do Leaching and detect, adopt HJ/T299 sulfuric acidNitrate method leaches. Testing result shows: Cr VI leaching concentration declines everywhere from 20mg/L before treatment0.02mg/L after reason; Total chromium leaching concentration drops to after treatment from 25mg/L before treatment0.05mg/L。
Embodiment 10
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 180:1 adds 180mol sodium polysulfide by reducing agent and chromic mol ratio. Stir 2minAfter, add 10L water, stir 3min. Then, add 6kg oxygen by 6 ﹪ of chromium-polluted soil qualityChange magnesium, stir 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day,To soil sampling after treatment, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach.Testing result shows: Cr VI leaching concentration drops to after treatment from 20mg/L before treatment0.01mg/L; Total chromium leaching concentration drops to 0.06mg/L after treatment from 25mg/L before treatment.
Embodiment 11
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 160:1 adds 160mol potassium polysulfide by reducing agent and chromic mol ratio. Stir 2minAfter, add 15L water, stir 3min. Then, add 6kg oxygen by 6 ﹪ of chromium-polluted soil qualityChange magnesium, stir 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 3 days,To soil sampling after treatment, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach.Testing result shows: Cr VI leaching concentration drops to after treatment from 20mg/L before treatment0.01mg/L; Total chromium leaching concentration drops to 0.06mg/L after treatment from 25mg/L before treatment.
Embodiment 12
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 140:1 adds the many magnesium sulfides of 140mol by reducing agent and chromic mol ratio. Stir 2minAfter, add 20L water, stir 3min. Then, add 4kg oxygen by 4 ﹪ of chromium-polluted soil qualityChange magnesium and add 4kg magnesium carbonate by 4 ﹪ of chromium-polluted soil quality, stirring 3min. By after treatmentSoil is in a huddle, hides with waterproof cloth. After maintenance 3 days, to soil sampling after treatment, leachToxicity detects, and adopts HJ/T299 sulfuric acid nitrate method to leach. Testing result shows: Cr VI leaches denseDegree drops to 0.02mg/L after treatment from 20mg/L before treatment; Total chromium leaching concentration is from processing25mg/L drop to 0.06mg/L after treatment.
Embodiment 13
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 120:1 adds 120mol calcium polysulfide by reducing agent and chromic mol ratio. Stir 2minAfter, add 25L water, stir 3min. Then, add 3kg oxygen by 3 ﹪ of chromium-polluted soil qualityChange magnesium and add 4kg magnesium carbonate by 4 ﹪ of chromium-polluted soil quality, stirring 3min. By after treatmentSoil is in a huddle, hides with waterproof cloth. After maintenance 1 day, to soil sampling after treatment, leachToxicity detects, and adopts HJ/T299 sulfuric acid nitrate method to leach. Testing result shows: Cr VI leaches denseDegree drops to 0.01mg/L after treatment from 20mg/L before treatment; Total chromium leaching concentration is from processing25mg/L drop to 0.06mg/L after treatment.
Embodiment 14
The chromium-polluted soil that to take hexavalent chromium concentration that 100kg is dry be 0.01mol/kg, by roll extrusionFragmentation is controlled at soil block particle diameter in 6cm. Soil after fragmentation is packed in mixer, stir on one sideMixing, is that 100:1 adds 100mol sodium sulfite by reducing agent and chromic mol ratio on one side. StirAfter 2min, add 24L water, stir 3min. Then, add 6kg by 6 ﹪ of chromium-polluted soil quality5 ﹪ of magnesia and chromium-polluted soil quality add 5kg calcium carbonate, stir 3min. By after treatmentSoil is in a huddle, hides with waterproof cloth. After maintenance 2 days, to soil sampling after treatment, leachToxicity detects, and adopts HJ/T299 sulfuric acid nitrate method to leach. Testing result shows: Cr VI leaches denseDegree drops to 0.02mg/L after treatment from 20mg/L before treatment; Total chromium leaching concentration is from processing25mg/L drop to 0.05mg/L after treatment.
Embodiment 15
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 80:1 adds 80mol potassium sulfite by reducing agent and chromic mol ratio. Stir after 2min,Add 25L water, stir 3min. Then, add 6kg magnesia by 6 ﹪ of chromium-polluted soil quality,Stir 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day, to processingAfter soil sampling, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach. Detect knotFruit shows: Cr VI leaching concentration drops to 0.01mg/L after treatment from 20mg/L before treatment;Total chromium leaching concentration drops to 0.06mg/L after treatment from 25mg/L before treatment.
Embodiment 16
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 60:1 adds 60mol magnesium sulfite by reducing agent and chromic mol ratio. Stir after 2min,Add 25L water, stir 3min. Then, add 8kg magnesia by 8 ﹪ of chromium-polluted soil quality,Stir 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day, to processingAfter soil sampling, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach. Detect knotFruit shows: Cr VI leaching concentration drops to 0.01mg/L after treatment from 20mg/L before treatment;Total chromium leaching concentration drops to 0.06mg/L after treatment from 25mg/L before treatment.
Embodiment 17
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit by reducing agent and chromic mol ratio be 200:1 add 200mol calcium sulfite and by reducing agent andChromic mol ratio is that 150:1 adds 150mol magnesium sulfite. Stir after 2min, add 20LWater, stirs 3min. Then, add 4kg calcium carbonate by 4 ﹪ of chromium-polluted soil quality and by chromium dirt2 ﹪ that dye soil quality add 2kg magnesia, stir 3min. By in a huddle soil after treatment,Hide with waterproof cloth. After maintenance 3 days, to soil sampling after treatment, do Leaching and detect, adoptHJ/T299 sulfuric acid nitrate method leaches. Testing result shows: Cr VI leaching concentration is from before treatment20mg/L drops to 0.02mg/L after treatment; Total chromium leaching concentration declines from 25mg/L before treatmentTo 0.06mg/L after treatment.
Embodiment 18
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 200:1 adds 200mol iron powder and by reducing agent and sexavalence by reducing agent and chromic mol ratioThe mol ratio of chromium is that 100:1 adds 100mol calcium sulfite. Stir after 2min, add 20L water,Stir 3min. Then, add 12kg magnesia by 12 ﹪ of chromium-polluted soil quality, stir 3min.By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day, soil after treatment is adoptedSample, does Leaching and detects, and adopts HJ/T299 sulfuric acid nitrate method to leach. Testing result shows: sixValency chromium leaching concentration drops to 0.01mg/L after treatment from 20mg/L before treatment; Total chromium leaches denseDegree drops to 0.06mg/L after treatment from 25mg/L before treatment.
Embodiment 19
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 50:1 adds 50mol iron powder by reducing agent and chromic mol ratio. Stir after 2min, addEnter 20L water, stir 3min. Then, add 10kg calcium carbonate by 10 ﹪ of chromium-polluted soil quality,Stir 3min. By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 2 days, to processingAfter soil sampling, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach. Detect knotFruit shows: Cr VI leaching concentration drops to 0.012mg/L after treatment from 20mg/L before treatment;Total chromium leaching concentration drops to 0.05mg/L after treatment from 25mg/L before treatment.
Embodiment 20
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit by reducing agent and chromic mol ratio be 150:1 add 150mol ferrous sulfate, by reducing agent andChromic mol ratio is that 150:1 adds 150mol iron powder, is by reducing agent and chromic mol ratio50:1 adds 50mol and enters ferrous nitrate. Stir after 2min, add 20L water, stir 3min. Then,Add 20kg calcium carbonate by 20 ﹪ of chromium-polluted soil quality, stir 3min. By soil after treatmentIn a huddle, hide with waterproof cloth. After maintenance 1 day, to soil sampling after treatment, do LeachingDetect, adopt HJ/T299 sulfuric acid nitrate method to leach. Testing result show: Cr VI leaching concentration from20mg/L before treatment drops to 0.01mg/L after treatment; Total chromium leaching concentration is from before treatment25mg/L drops to 0.06mg/L after treatment.
Embodiment 21
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit by reducing agent and chromic mol ratio be 150:1 add 150mol ferrous sulfate, by reducing agent andChromic mol ratio is that 150:1 adds 150mol iron powder, is by reducing agent and chromic mol ratio50:1 adds 50mol ferrous nitrate. Wherein, ferrous nitrate joins in soil after dissolving in 20L water againStir 3min. Then, add 18kg calcium carbonate by 18 ﹪ of chromium-polluted soil quality, stir 3min.By in a huddle soil after treatment, hide with waterproof cloth. After maintenance 1 day, soil after treatment is adoptedSample, does Leaching and detects, and adopts HJ/T299 sulfuric acid nitrate method to leach. Testing result shows: sixValency chromium leaching concentration drops to 0.01mg/L after treatment from 20mg/L before treatment; Total chromium leaches denseDegree drops to 0.06mg/L after treatment from 25mg/L before treatment.
Embodiment 22
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 300:1 adds 300mol frerrous chloride by reducing agent and chromic mol ratio. Wherein, chlorinationFerrous iron joins in soil after being dissolved in 20L water again. Stir after 5min, by chromium-polluted soil quality10 ﹪ add 10kg calcium hydroxide, stir 3min. By in a huddle soil after treatment, use rainCloth hides. After maintenance 1 day, to soil sampling after treatment, do Leaching and detect, adopt HJ/T299Sulfuric acid nitrate method leaches. Testing result shows: Cr VI leaching concentration declines from 20mg/L before treatmentTo 0.01mg/L after treatment; Total chromium leaching concentration drops to after treatment from 25mg/L before treatment0.04mg/L。
Embodiment 23
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm. Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 250:1 adds 250mol ferrous carbonate by reducing agent and chromic mol ratio. Wherein, carbonic acidFerrous iron joins in soil after dissolving in 25L water again, stirs after 8min, by chromium-polluted soil quality14 ﹪ add 14kg calcium carbonate, stir 3min. By in a huddle soil after treatment, hide with waterproof clothLid. After maintenance 1 day, to soil sampling after treatment, do Leaching and detect, adopt HJ/T299Sulfuric acid nitrate method leaches. Testing result shows: Cr VI leaching concentration declines from 20mg/L before treatmentTo 0.014mg/L after treatment; Total chromium leaching concentration drops to after treatment from 25mg/L before treatment0.06mg/L。
Although openly preferred embodiment of the present invention, they are not for limiting the present invention, anyThose skilled in the art, in not departing from the scope of the present invention, various changes can be made and adjustment,What therefore protection scope of the present invention should be defined with the application's claim protection domain is as the criterion.
Claims (1)
1. a restorative procedure for chromium-polluted soil, is characterized in that the method is as follows:
Take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, will by roll extrusion fragmentationSoil block particle diameter is controlled in 6cm; Soil after fragmentation is packed in mixer, stir one on one sideLimit is that 160:1 adds 160mol potassium polysulfide by reducing agent and chromic mol ratio; Stir 2minAfter, add 15L water, stir 3min; Then, add 6kg oxygen by 6 ﹪ of chromium-polluted soil qualityChange magnesium, stir 3min; By in a huddle soil after treatment, hide with waterproof cloth; After maintenance 3 days,To soil sampling after treatment, do Leaching and detect, adopt HJ/T299 sulfuric acid nitrate method to leach.
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| CN104307868B (en) * | 2014-09-16 | 2016-06-08 | 青海省环境科学研究设计院 | Remove chromic method in chromium-polluted soil |
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