CN104941993A - Comprehensive remediation method for seriously polluted land - Google Patents
Comprehensive remediation method for seriously polluted land Download PDFInfo
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- CN104941993A CN104941993A CN201510433793.0A CN201510433793A CN104941993A CN 104941993 A CN104941993 A CN 104941993A CN 201510433793 A CN201510433793 A CN 201510433793A CN 104941993 A CN104941993 A CN 104941993A
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Abstract
The invention discloses a comprehensive remediation method for seriously polluted land. The comprehensive remediation method comprises the following steps: digging up soil from the seriously polluted land; putting the soil into a treatment tank; mixing the soil with a remediator, and uniformly stirring the soil and the remediator to obtain a mixture I; carrying out a reaction for 4 to 5 hours; carrying out mud-water separation after the reaction, so as to separate out precipitate of heavy metal, repeating the steps for 5 to 10 times; adding molasses and bean cake powder; uniformly stirring to obtain a mixture II; adjusting the moisture content of the mixture II to be 20 to 40 percent; carrying out air isolated curing for 1 month at 20 to 30 DEG C to obtain a semi-finished soil product; putting the semi-finished soil product into the seriously polluted land; applying an organic fertilizer; putting earthworms for cultivation; watering every day to ensure that the moisture content is 60 to 70 percent; collecting the earthworms after half a month; planting sisal and tall fescue in the soil, wherein each planting season lasts for three months, and after planting in each planting season, plants are collected together with roots, the soil is turned again for planting, and the organic fertilizer is added for further planting.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to a kind of method for comprehensive repairing of serious pollution soil.
Background technology
Soil is the loose surface layer that earth surface has fertility, energy growing plant; it be the mankind depend on for existence development the necessary means of production; also be the most basic, most important, the irreplaceable natural resources of human society, therefore extensive concern caused to the protection of soil environment.
By the kind of pollutant, contaminated soil can be divided into the soil of Organic Pollution and the soil of inorganic pollution.Soil organic pollutant fingering enters soil environment and the organic compound polluted, and mainly comprises petroleum-type, benzene homologues, agricultural chemicals, polycyclic aromatic hydrocarbon (PAHs), Polychlorinated biphenyls (PCBs) etc.The industry including organic pollutants discharge mainly contains petrochemical industry, coking, paint and coating manufacture, pesticide producing, rubber manufacture, leather shoes manufacture, wood-based plate and wood furniture manufacture, automobile and accessory spraying, Electronic products manufacturing, steel-making, manufacture of cement etc.In addition, China once produced in a large number and widely used POPs insecticides DDT, hexachloro-benzene, Niran and mirex etc., although these agricultural chemicals have been forbidden for many years, still had residual in soil.The soil mainly heavy metal pollution of inorganic pollution, 1.5 ten thousand tons of mercury, 3,400,000 tons of copper, 5,000,000 tons of lead, 1,500 ten thousand tons of manganese that the whole world is discharged every year on average all will enter soil in every way, China has accounted for 1/5 of total area under cultivation by the cultivated area of the heavy metal pollutions such as cadmium, arsenic, chromium, lead, relate to 11 and economize 25 areas, the economic loss therefore caused every year reaches more than 200 hundred million yuan.This ubiquitous soil pollution, need economy, safety ecological reestablishment just can extensively solve.
At present, for the soil containing volatile organic matter pollutant (VOCs) and total petroleum hydrocarbon (TPH), recovery technique both domestic and external comparatively ripe (as chemical oxidation, gas phase extracting, biological compost, normal temperature parsing etc.), its repairing effect also can be guaranteed; For the soil containing multiring aromatic hydrocarbon (PAHs) pollutant, mainly contain four kinds of recovery techniques: microbial degradation, light degradation, high-temperature heat treatment and chemical oxidation.Research finds, PAHs more than 4 rings, because of its poorly water-soluble, makes it be difficult to be degraded by microorganisms.In addition microbial degradation needs longer Deal with Time, high to the control overflow of temperature, and the workload in early stage is large, and the duration of engineering can be very long; For photooxidation technology, also only rest on theoretical research stage at present, domestic also without practical application example; For high-temperature heat treatment technology (as high-temperature hot desorption), use both at home and abroad comparatively extensive, can remove thoroughly PAHs all kinds of in soil, but this technology cost of disposal is high, and equipment debugging, run also relative complex; For chemical oxidation, this technology maturation, dispose the cycle short, cost is also lower.Be widely used at present in the reparation by VOCs, TPH and part PAHs (below 5 rings) contaminated soil.And for the contaminated soil containing 5 rings and the above PAHs of 5 rings, chemical oxidation techniques repairing effect is not good.
Existing remediation of heavy metal-contaminated soil mainly comprises chemical method (chemical immobilization and stabilisation, electronation), isolation investment, hot smelting partition method, electric repairing method, microorganism remediation method, phytoremediation, absorption method and ablution etc., chemical method changes the character of soil, disposal cost is high, and there is secondary pollution.In a word, generally all there is the defect that cost is high, secondary pollution serious, complicated operation, repairing efficiency are long in current soil restoring technology; Heavy metal is only isolated by isolation investment, still there is potential danger to soil ecology; Electricity repairing method technology is more immature; Hot smelting partition method is not suitable for execute-in-place, and disposal cost is high, narrow application range; The carrier that microorganism remediation method utilizes is living microorganisms, and the discontinuous distribution of pollutant can cut off microorganism motion, therefore long processing period, and competes organic nutrient substance with indigenous microorganism and make substrate, easily loses activity; , there is the subsequent treatment problem of plant in phytoremediation repairing efficiency long (decades are the centuries even); Electricity reparation is only applicable to small size and pollutes, and execute-in-place difficulty is large; Absorption method exist easily saturated, cost is high, efficiency low ground shortcoming; Relative to above-mentioned additive method, it is short that ablution has the cycle, the advantage that cost is low, but when adopting chemical reagent, easily affecting soil environment, causing secondary pollution.
These methods above-mentioned in prior art, although there is its advantage, function ratio is more single, and has some limitations, and cannot process the soil of complicated serious pollution, such as, simultaneously by the soil of organic matter and inorganic pollution.
Summary of the invention
Goal of the invention: for by the soil of multiple pollution sources serious pollution, single restorative procedure often can not be satisfied the demand, and the invention provides the method for comprehensive repairing that a kind of showering and original position animal-phytoremediation combine.
Technical scheme: the method for comprehensive repairing that the invention provides a kind of serious pollution soil, concrete, be carry out as follows:
Polluted soil is excavated, and moves to treatment pond, mix with renovation agent, stir, reaction 4 ~ 5h, carries out mud-water separation after reaction, makes heavy metal form precipitate and separate, after repetition said process 5 ~ 10 times, add molasses and beancake powder wherein, stir, regulate moisture content 20% ~ 40%, at 20 DEG C ~ 30 DEG C temperature, isolated air care 1 month;
Above-mentioned soil is retracted original place, applies fertilizer, put into vermiculture, every day waters, and ensures that moisture content is 60 ~ 70%, after two weeks, carries out earthworm collection;
Then in above-mentioned soil, planting sisal hemp and tall grass, was a season with three months, after per season plantation terminates, connected root and collected, plantation of again digging, add fertilizer, again plant.
Described renovation agent is the mixture of EDTA and citric acid, the volume ratio 1: 4 of polluted soil and renovation agent consumption.
Described fertilizer is the mixture of cow dung and urea.
The method that described earthworm is collected is: adopt natural lighting collecting method, 24h waters in advance, again the soil on upper strata is concentrated on cement flooring or Polypropylence Sheet, successively push aside, soil is scratched clean, makes earthworm concentrate on bottom, reach collection object, and by vermis and soil sieving separating, after collecting, soil returns paving; After three months, then the one-tenth earthworm within depth of soil 20cm is collected.
In time planting sisal hemp and tall grass, according to 6 strains/square metre plantation sisal hemp seedling, according to 30 strains/square metre plantation tall grass.
Completing whole repairing efficiency is 18 months.
Beneficial effect: the present invention is based on biology in situ reparation, chemical leaching is auxiliary complex repairation technology, and organically combines the effect of microorganism, can effectively process by the soil of multiple pollution sources severe contamination.
The present invention utilizes the wriggling of earthworm to ingest, and related earth is taken in body, and heavy metal is stopped and enrichment in earthworm body, utilizes sisal hemp and tall grass to the super accumulation ability of organic matter and heavy metal to remove heavy metal pollution of soil simultaneously.In conjunction with animals and plants strengthening complex repairation, environmental friendliness, does not produce the secondary pollution to soil.
Detailed description of the invention:
Be described in further detail technical scheme of the present invention below in conjunction with embodiment, protection scope of the present invention is not limited to following detailed description of the invention.
Restorative procedure:
To be excavated by by polluted soil, and move to treatment pond, polluted soil and renovation agent (EDTA: citric acid=4:1) to mix by volume at 1: 4, stir, reaction 4.5h, carry out mud-water separation after reaction, make heavy metal form precipitate and separate, chemical leaching time controling was at 1 month.In above-mentioned soil, add molasses and beancake powder, the mass ratio of beancake powder and molasses is 1:2 ~ 9, stirs, and regulates moisture content 20% ~ 40%, at 20 DEG C ~ 30 DEG C temperature, and isolated air care 1 month.
Above-mentioned soil is retracted original place, applies fertilizer, put into vermiculture, every day waters, and ensures that moisture content is 60 ~ 70%, after two weeks, adopt natural lighting collecting method, 24h waters in advance, then concentrates on cement flooring or Polypropylence Sheet by the soil on upper strata, successively push aside, soil is scratched clean, makes earthworm concentrate on bottom, reach collection object, and by vermis and soil sieving separating, after collecting, soil returns paving; After three months, then the one-tenth earthworm within depth of soil 20cm is collected.
Then in above-mentioned soil, sisal hemp and tall grass is planted, according to 6 strains/square metre plantation sisal hemp seedling, according to 30 strains/square metre plantation tall grass.Be a season with three months, after per season plantation terminates, connect root and collect, plantation of again digging, interpolation fertilizer, completing whole repairing efficiency is 18 months.
Embodiment 1
Handled soil object, containing volatile organic matter pollutant (VOCs) 5510mg/kg, containing polycyclic aromatic hydrocarbon (PAHs) 785mg/kg, containing manganese 2400mg/kg, containing chromium 758mg/kg.
After above-mentioned restorative procedure process, containing volatile organic matter pollutant (VOCs) 0mg/kg, containing polycyclic aromatic hydrocarbon (PAHs) 10mg/kg, containing manganese 54mg/kg, containing chromium 8mg/kg.
Embodiment 2
Handled soil object, containing volatile organic matter pollutant (VOCs) 4522mg/kg, containing manganese 1540mg/kg, containing chromium 311mg/kg.
After above-mentioned restorative procedure process, containing volatile organic matter pollutant (VOCs) 0mg/kg, containing manganese 14mg/kg, containing chromium 0mg/kg.
Embodiment 3
Handled soil object, containing volatile organic matter pollutant (VOCs) 7500mg/kg, containing polycyclic aromatic hydrocarbon (PAHs) 580mg/kg, containing chromium 300mg/kg.
After above-mentioned restorative procedure process, containing volatile organic matter pollutant (VOCs) 16mg/kg, containing manganese 0mg/kg, containing chromium 0mg/kg.
Embodiment 4
Handled soil object, containing volatile organic matter pollutant (VOCs) 3414mg/kg, containing polycyclic aromatic hydrocarbon (PAHs) 589mg/kg, containing manganese 1100mg/kg, containing chromium 411mg/kg.
After above-mentioned restorative procedure process, containing volatile organic matter pollutant (VOCs) 0mg/kg, containing polycyclic aromatic hydrocarbon (PAHs) 0mg/kg, containing manganese 7mg/kg, containing chromium 0mg/kg.
Claims (6)
1. the method for comprehensive repairing in serious pollution soil, is characterized in that carrying out as follows:
Polluted soil is excavated, and moves to treatment pond, mix with renovation agent, stir, reaction 4 ~ 5h, carries out mud-water separation after reaction, makes heavy metal form precipitate and separate, after repetition said process 5 ~ 10 times, add molasses and beancake powder wherein, stir, regulate moisture content 20% ~ 40%, at 20 DEG C ~ 30 DEG C temperature, isolated air care 1 month;
Above-mentioned soil is retracted original place, applies fertilizer, put into vermiculture, every day waters, and ensures that moisture content is 60 ~ 70%, after two weeks, carries out earthworm collection;
Then in above-mentioned soil, planting sisal hemp and tall grass, was a season with three months, after per season plantation terminates, connected root and collected, plantation of again digging, add fertilizer, again plant.
2. restorative procedure as claimed in claim 1, is characterized in that described renovation agent is the mixture of EDTA and citric acid, the volume ratio 1: 4 of polluted soil and EDTA consumption.
3. restorative procedure as claimed in claim 1, is characterized in that described fertilizer is the mixture of cow dung and urea.
4. restorative procedure as claimed in claim 1, it is characterized in that the method that described earthworm is collected is: adopt natural lighting collecting method, 24h waters in advance, again the soil on upper strata is concentrated on cement flooring or Polypropylence Sheet, successively push aside, soil is scratched clean, earthworm is made to concentrate on bottom, reach collection object, and by vermis and soil sieving separating, after collecting, soil returns paving; After three months, then the one-tenth earthworm within depth of soil 20cm is collected.
5. restorative procedure as claimed in claim 1, when it is characterized in that plantation sisal hemp and tall grass, according to 6 strains/square metre plantation sisal hemp seedling, according to 30 strains/square metre plantation tall grass.
6. restorative procedure as claimed in claim 1, is characterized in that whole repairing efficiency is 18 months.
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| CN201510433793.0A CN104941993B (en) | 2015-07-22 | 2015-07-22 | A kind of method for comprehensive repairing in serious pollution soil |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107695087A (en) * | 2017-10-19 | 2018-02-16 | 福州清河源环保科技有限公司 | A kind of method of restoration of the ecosystem heavy-metal contaminated soil |
| CN108080407A (en) * | 2018-02-01 | 2018-05-29 | 上海盛弘环境科技有限公司 | A kind of moveable-type soil pollution is the same as position restorative procedure |
| CN109759440A (en) * | 2019-02-27 | 2019-05-17 | 安徽科技学院 | It is a kind of to plant planting apparatus for repairing the green of heavy metals mining area soil |
| CN110153171A (en) * | 2019-06-03 | 2019-08-23 | 四川农业大学 | A kind of method of repairing heavy metal in soil cadmium pollution |
| CN110180875A (en) * | 2019-06-13 | 2019-08-30 | 生态环境部南京环境科学研究所 | A kind of cogongrass cultural method for rehabilitating soil |
| CN111229807A (en) * | 2019-10-18 | 2020-06-05 | 杭州罗松贸易有限公司 | Soil remediation method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107695087A (en) * | 2017-10-19 | 2018-02-16 | 福州清河源环保科技有限公司 | A kind of method of restoration of the ecosystem heavy-metal contaminated soil |
| CN108080407A (en) * | 2018-02-01 | 2018-05-29 | 上海盛弘环境科技有限公司 | A kind of moveable-type soil pollution is the same as position restorative procedure |
| CN109759440A (en) * | 2019-02-27 | 2019-05-17 | 安徽科技学院 | It is a kind of to plant planting apparatus for repairing the green of heavy metals mining area soil |
| CN109759440B (en) * | 2019-02-27 | 2021-01-05 | 安徽科技学院 | Green planting device for repairing heavy metal soil in mining area |
| CN110153171A (en) * | 2019-06-03 | 2019-08-23 | 四川农业大学 | A kind of method of repairing heavy metal in soil cadmium pollution |
| CN110153171B (en) * | 2019-06-03 | 2021-06-25 | 四川农业大学 | Method for remedying soil polluted by heavy metal cadmium |
| CN110180875A (en) * | 2019-06-13 | 2019-08-30 | 生态环境部南京环境科学研究所 | A kind of cogongrass cultural method for rehabilitating soil |
| CN111229807A (en) * | 2019-10-18 | 2020-06-05 | 杭州罗松贸易有限公司 | Soil remediation method |
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