CN105032907A - Method of combinedly-reinforced repairing pyrene-and-lead combinedly-polluted soil with scripus triqueter - Google Patents
Method of combinedly-reinforced repairing pyrene-and-lead combinedly-polluted soil with scripus triqueter Download PDFInfo
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- CN105032907A CN105032907A CN201510034317.1A CN201510034317A CN105032907A CN 105032907 A CN105032907 A CN 105032907A CN 201510034317 A CN201510034317 A CN 201510034317A CN 105032907 A CN105032907 A CN 105032907A
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Abstract
The invention relates to a method of combinedly-reinforced repairing pyrene-and-lead combinedly-polluted soil with scripus triqueter. The method includes following steps: (1) transplanting seedlings of the scripus triqueter to soil polluted by pyrene and/or lead, wherein the planting density of the seedlings of the scripus triqueter is 600-1000/m<2>; (2) after seedling recovering for 10 days, irrigating a mixed solution containing nitrilotriacetic acid and alkyl glycoside to soil to maintain the total mass of the nitrilotriacetic acid and alkyl glycoside in soil is 1.0-2.5 g per cubic meter soil; (3) when the scripus triqueter is matured, moving the scripus triqueter away to repair the soil polluted by pyrene and/or lead. The reinforced plant repairing technology, compared with other repairing methods, is environment-friendly, is low in cost, is high in repairing efficiency and is easy to carry out.
Description
Technical field
The present invention relates to a kind of method that combined reinforced Fischer grass repairs pyrene and plumbous combined contamination soil.
Background technology
Along with the development of China's industrialization and urbanization process, in environment, the discharge capacity of heavy metal and organic pollution can remain on higher level within considerable time, and therefore China's soil pollution also will tend to intensification and complicated.Soil pollutant is divided into organic pollution and inorganic pollution.Organic pollution mainly comprises polycyclic aromatic hydrocarbon, organic agricultural chemicals, phenolic compound and oil etc., and inorganic pollution mainly comprises heavy metal, radionuclide, acid, alkali and salt etc.Polycyclic aromatic hydrocarbon (PolycyclicAromaticHydrocarbons, PAHs) is the class organic pollution extensively existed in environment.PAHs refers to the organic compound of two or more phenyl ring condensed ring, difficult for biological degradation, has very strong teratogenesis, carcinogenic and mutagenic " three cause " effect.Because PAHs is highly fat-soluble, therefore easy in the rich fat organs of human body and emulsion accumulation, also by biomagnification, serious harm human health; Pyrene is the PAHs pollutant be extensively present in environment.Heavy metal is widest in area in soil pollution, that harmfulness is maximum first kinds of pollution matter.Heavy metal can not decompose or degrade in soil environment, and they can accumulate in vivo and transform, and raises successively from the concentration of unicellular lower eukaryote island higher organism accumulation.Along with the increase of heavy metal concentration, body metabolism process and enzyme system are affected, and therefore heavy metal pollution also becomes the Focal point and difficult point of current ecology, agricultural and environmental science research; The lead concentration of children severe overweight in some region of China, plumbous as the heavy metal contaminants of central nervous system grievous injury can be caused by most attention.In addition, although the Environment Pollution Event that Single Pollution thing is formed happens occasionally, in fact the single organic matter of absolute sense or single heavy metal are non-existent, and organic matter and heavy metal pollution all have comprehensive and association.Organic matter in soil-heavy-metal composite pollution phenomenon is very general.Therefore, the reparation of pyrene and this Organic-inorganic composite of lead contaminated environment is significant.To the improvement of organic matter-heavy-metal composite pollution with repair and become problem demanding prompt solution in global range.The a series of soil restoring technology of current domestic development, comprises employed physico-chemical techniques reparation and biological prosthetic.Adopt employed physico-chemical techniques restoration of soil polluted by heavy metal, not only somewhat expensive, is difficult to use in the improvement of massive pollution soil, and usually causes soil texture destruction, biological activity of soil decline and soil fertility degeneration etc.Relative to traditional physics, chemical remediation technology, phytoremediation is a kind of novel biological prosthetic approach.
The most speed of growth of hyperaccumulative plant found at present in phytoremediation is slow, biomass is little and a kind ofly mostly can only absorb a kind of pollutant, and the combined pollution that current soil pollution is made up of jointly several pollutant often, thus greatly limit the practical application of phytoremediation technology in combined contamination soil.Surfactant is a kind of enhancing agents, can improve the concentration of the organic matters such as PAHs in soil in the soil liquid and its bioavailability, promote the degraded of plant absorption or microorganism.Chelating agent is a class heavy metallic activation agent, and the metal ion in energy chelating soil, makes heavy metal get off from soil particle surface desorption while solvent is not converted into soluble state, thus improve the bioavailability of heavy metal in soil.Therefore exploitation selects suitable eco-friendly chelating agent and surfactant to have a great impact for popularization phytoremediation technology tool.
Summary of the invention
The object of this invention is to provide a kind of method that combined reinforced Fischer grass repairs pyrene and plumbous combined contamination soil.
Plant of the present invention is Fischer grass, for Cyperaceae Fischer grass belongs to.Perennial aquatic very water herbaceous plant, the root-like stock of crawling that tool is long.In 6 ~ September of flowering fruit bearing stage, belong to generative propagation.Fischer grass winter resistance moisture-proof is hygrophyte.The ground of moist many water is born in happiness, often in the side of a pond, ditch ground, small stream side, mountain valley or marshland, occurs the dominant group of Fischer grass in flakes.Like warm, moistening and half cloudy environment.Growth room temperature 13 ~ 19 DEG C, winter temperature is not less than 7 DEG C, and its under ground portion can resistance to-15 DEG C of low temperature.
For achieving the above object, the present invention adopts following technical scheme:
The method of pyrene and/or plumbous combined contamination soil repaired by a kind of combined reinforced Fischer grass, it is characterized in that the concrete steps of the method are: by Fischer grass seedling replanting in the soil of pyrene and/or lead contamination, every square meter plantation Fischer grass seedling 600 ~ 1000, the slow seedling of Fischer grass is after 10 days, in soil, pouring contains the mixed solution of nitrilotriacetic acid and APG, nitrilotriacetic acid and APG gross mass in every cubic metre of soil is kept to be 1.0 ~ 2.5g, after Fischer grass growth and maturity, Fischer grass is removed from soil, realizes the reparation to pyrene and/or plumbous combined contamination soil.
Above-mentioned nitrilotriacetic acid and the mass ratio of APG are 1:(0.75 ~ 1.1).
The present invention by watering a certain amount of APG and NTA in soil, to improve pyrene and plumbous bioavailability in soil, thus improves Fischer grass to pyrene and plumbous absorption and Soil Microorganism to the degraded of pyrene.The Fischer grass of results, carries out sanitary landfills or burning with rubbish, also can carry out comprehensive recycling etc. to it in some way, reduce somewhat the possibility of its secondary pollution.
Accompanying drawing explanation
The interpolation of Fig. 1 variable concentrations ratio NTA and APG on the Fischer grass impact (a) of plant height and the interpolation of variable concentrations ratio NTA and APG on the impact (b) of Fischer grass biomass.
The interpolation of Fig. 2 variable concentrations ratio NTA and APG absorbs plumbous impact to Fischer grass.
The interpolation of Fig. 3 variable concentrations ratio NTA and APG is on the impact of pyrene clearance in soil.
Detailed description of the invention
For examination soil:
Experiment earth sample picks up from Shanghai University's eastern campus, pollution-free history, self-control pyrene-plumbous combined contamination soil.Pyrene and the lead concentration of simulating pollution soil are respectively: 202 ± 5mg/kg; 575 ± 5mg/kg.
Embodiment:
Test and amount to 60 days at 2014 (2014.8.2 ~ 2014.10.2), test site is selected in cyclisation institute of Shanghai University laboratory building.Test Fischer grass used and pick up from Wusong, Shanghai City mouth Binjiang wetland, the every square meter plantation Fischer grass seedling 1000 of slow seedling after one week, plant (is keeping in basin soil moisture content be 75% of maxmun field capacity) after preculture about 10 days for trying in soil.Nine processed group are established in test altogether, each processed group three is parallel, the nitrilotriacetic acid of the potted plant middle interpolation variable concentrations ratio namely after preculture and APG solution, its content in soil is respectively: 0g/kg, 1g/kg, 2g/kg and above concentration composite between two, specifically as listed in table 1.
The process of table 1 pot experiment
Cultivate in plant process, make soil moisture content in basin be maintained 75% of its maxmun field capacity, experiment water used is running water.Cultivate after 45 days, soil sample and plant sample are sampled.The existing distilled water of plant sample cleans up, then dips in dry surface moisture with filter paper.Then the root of plant and stem connected position are cut off, be divided into root and stem two parts; Soil collecting carries out freeze drying, fully mixes, and crosses 20 mesh sieves.Preserve in the refrigerator of-80 DEG C in order to analyzing.
Experimental result is as follows:
(1) interpolation of NTA and APG of variable concentrations ratio is on the impact of Fischer grass upgrowth situation
NTA and APG belongs to additional compound, has favourable or injurious effects to a certain extent to the growth of plant.The plant height of plant and biomass are the very important characteristic manner of vegetation growth state.Investigate the impact of interpolation variable concentrations ratio NTA and APG on plant plant height and biomass and whether can be used as it important indicator strengthening Fischer grass repairing polluted soil.Fig. 1 (a) shows the change of plant plant height under different disposal group, and when adding separately NTA, the plant height of plant increases to some extent, and along with the increase of its concentration, the height of plant also increases gradually to some extent.Fig. 1 (b) shows the biology weight of harvested of different disposal group Fischer grass and stem, has also occurred same trend, and under the left and right of independent nitrilotriacetic acid, the biology of root and stem is heavy to be increased all to some extent.More than illustrate that nitrilotriacetic acid is likely as a kind of carbon source, suitably can promote the growth of plant.But, add the processed group of APG, the contrary trend that the plant height of its plant and the biomass of ground and under ground portion present, but it contrasts with blank group, this inhibitory action can be shown only obvious what just show when APG concentration is higher.NTA and APG together adds in soil, and especially when concentration is higher, the growth of Fischer grass receives obvious inhibitory action, and this may be because two kinds of materials together add fashionable, causes the concentration of additions excessive, inhibits the growth of plant to a certain extent.Therefore, its addition should be considered at these two kinds of materials of interpolation as during hardening agent, can not be excessive, cause the growth suppressing plant.
(2) interpolation of NTA and APG of variable concentrations ratio absorbs plumbous impact to Fischer grass
Because heavy metal can not be degraded by microorganisms, Phytoremediation of Soils Contaminated by Heavy Metals removal pathway is therefore utilized to be mainly the absorption of plant heavy metal.Fig. 2 shows the careless change to absorbing Lead In Soil of Fischer under different disposal group (adding nitrilotriacetic acid and the APG solution of variable concentrations ratio).The root of contrast Fischer grass and stem are to the accumulation in soil, and the accumulation of root to lead is far longer than the accumulation of stem to it.Especially, in blank group, stem does not almost have absorbing of lead.Compare with blank group, when adding separately NTA, Fischer grass has had the accumulation of lead and has improved widely, and to a certain extent, along with the increase of its concentration, accumulation also increases thereupon.But add separately the processed group of APG, no matter be follow or stem, it is all significantly smaller than other processed group to the uptake of lead, but compares with blank, and its uptake increases to some extent, illustrates that APG has trickle invigoration effect to plant absorption lead.But, be aided with while interpolation APG and add NTA, plant is significantly improved than the ability of adding separately APG accumulation plumbous to the accumulation ability of lead, and under the effect of NTA, lead shifts to aerial part more, illustrate that nitrilotriacetic acid can improve the bioavailability of Lead In Soil greatly in combined reinforced process, and APG is because certain reason can make lead shift from the aerial part of plant to aerial part.
(3) APG of variable concentrations ratio and the interpolation of nitrilotriacetic acid are on the impact of pyrene degradation rate in soil
Pyrene belongs to organic matter, different from heavy metal, and it is in phytoremediation process, is not only reduce residual quantity by the absorption of plant, and it also can oxidizedly under the effect of microorganism be degraded.The pyrene clearance that Fig. 3 shows the amount by recording pedo relict pyrene and obtains.In blank group, the degradation rate of pyrene reaches 63%, illustrates that Fischer is careless when without enhancements, and it can pyrene together with the microbial association carried in soil in rehabilitating soil.When adding separately APG, the degradation rate of pyrene has had obvious increase, but when the concentration of NTA reaches 2g/kg, this invigoration effect declines to some extent, but compared with blank group, still there is invigoration effect.Compared with APG independent role, the invigoration effect of nitrilotriacetic acid is also not obvious, but compared with blank group, when with the addition of nitrilotriacetic acid, the degradation rate of pyrene makes moderate progress.Add at the same time in the processed group of APG and nitrilotriacetic acid, although its invigoration effect not adding separately APG is obvious, but can be as can be seen from Figure 3, APG can improve the invigoration effect of nitrilotriacetic acid more to a certain extent, and this illustrates that nitrilotriacetic acid and APG are repaired in pyrene contaminated soil process at strengthening Fischer grass and serves synergy.
In summary, the green non-poisonous chelating agent of this patent and the combined reinforced Fischer grass that carries out of surfactant is utilized to repair organic with inorganic compounding contaminated soil environment, the pollutant of polycyclic aromatic hydrocarbon pyrene in environment and this kind of compound of heavy metal lead can be removed, the secondary pollution of soil environment can not be caused again, the features such as this restorative procedure has environmental friendliness, expense is low, remediation efficiency is high, workable, environmental benefit, economic benefit and Landscape benefit are remarkable.
Claims (2)
1. the method for pyrene and/or plumbous combined contamination soil is repaired at a kind of combined reinforced Fischer grass, it is characterized in that the concrete steps of the method are: by Fischer grass seedling replanting in the soil of pyrene and/or lead contamination, every square meter plantation Fischer grass seedling 600 ~ 1000, the slow seedling of Fischer grass is after 10 days, in soil, pouring contains the mixed solution of nitrilotriacetic acid and APG, nitrilotriacetic acid and APG gross mass in every cubic metre of soil is kept to be 1.0 ~ 2.5g, after Fischer grass growth and maturity, Fischer grass is removed from soil, realizes the reparation to pyrene and/or plumbous combined contamination soil.
2. method according to claim 1, is characterized in that the mass ratio of described nitrilotriacetic acid and APG is 1:(0.75 ~ 1.1).
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| CN107716543A (en) * | 2017-09-19 | 2018-02-23 | 上海大学 | The method for repairing pyrene nickel combined pollution wetland using chemical enhancer and the combined reinforced wetland plant scirpus triqueter of liquid bacterial agent |
| CN108555006A (en) * | 2018-01-10 | 2018-09-21 | 西北农林科技大学 | A kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination |
| CN109365494A (en) * | 2018-11-30 | 2019-02-22 | 江门市邑凯环保服务有限公司 | A kind of plant restoration method for administering cadmium manganese chromium combined contamination soil |
| CN110201997A (en) * | 2019-06-05 | 2019-09-06 | 上海大学 | A kind of method that poly-aspartate strengthens beggar-ticks reparation pyrene and nickel combined contamination soil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107716543A (en) * | 2017-09-19 | 2018-02-23 | 上海大学 | The method for repairing pyrene nickel combined pollution wetland using chemical enhancer and the combined reinforced wetland plant scirpus triqueter of liquid bacterial agent |
| CN108555006A (en) * | 2018-01-10 | 2018-09-21 | 西北农林科技大学 | A kind of method that NTA cooperations shrub species repairs drought-hit area basic soil lead contamination |
| CN109365494A (en) * | 2018-11-30 | 2019-02-22 | 江门市邑凯环保服务有限公司 | A kind of plant restoration method for administering cadmium manganese chromium combined contamination soil |
| CN109365494B (en) * | 2018-11-30 | 2021-06-01 | 江门市邑凯环保服务有限公司 | Phytoremediation method for treating cadmium-manganese-chromium composite polluted soil |
| CN110201997A (en) * | 2019-06-05 | 2019-09-06 | 上海大学 | A kind of method that poly-aspartate strengthens beggar-ticks reparation pyrene and nickel combined contamination soil |
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