CN103521508A - Phytoremediation method for soil with cadmium pollution - Google Patents
Phytoremediation method for soil with cadmium pollution Download PDFInfo
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Abstract
The invention discloses a phytoremediation method for soil with cadmium pollution. The method comprises the following steps: ryegrass is planted in soil with cadmium pollution; organic acid is added before harvest, and the organic acid is one selected from ethylene diamine tetraacetic acid, oxalic acid, glacial acetic acid, propane diacid, tartaric acid or malic acid. In the method, based on ryegrass as a biomass raw material, when the ryegrass is used to restore the soil with cadmium pollution, through activation and induction actions of the organic acid, the bio-availability of heavy metal cadmium is raised, absorption and enrichment of cadmium of plants are promoted, and therefore the phytoremediation speed of soil with heavy metal pollution is raised. In addition, the organic acid can promote increase of amount of dry matter of overground parts and root systems of ryegrass to some extent, and finally, long-term goals of harmony of soil productivity restoration and local landscapes, ecological balance and sustainable development are achieved.
Description
Technical field
The present invention relates to the bioremediation technology of contaminated soil, a kind of method that particularly polluted soil phyto is repaired.
Background technology
China is faced with resource-type and water quality type lack of water Double jeopardy, and the in the situation that of shortage of water resources, in order to ensure agricultural production, the passive sewage that utilizes in many places is irrigated.According to Ministry of Water Resources's investigation, within 1991, China's sewage irrigation area is 4,600 ten thousand mu, within 2004, has reached 5,427 ten thousand mu, accounts for 7.3% of the total irrigated area in the whole nation.A large amount of raw sewerages are directly used in field irrigation, although solved the matter of great urgency of some regional lacks of water, pay through the nose for it.Sewage irrigation makes pollutant, and particularly heavy metal is residual in a large number in soil, directly affect the 26S Proteasome Structure and Function of soil ecosystem, biotic population structure is changed, bio-diversity reduces, and soil productivity declines, and soil physico-chemical property worsens, and affect plant growth, cause crop production reduction and agricultural product quality to decline, ecological environment, food security and agricultural sustainable development are constituted a threat to, the overall situation severe of soil pollution.According to State Environmental Protection Administration's investigation, the whole nation is subject to the arable land of heavy metal, chemical fertilizer, pollution by pesticides approximately to have 1.5 hundred million mu at present, accounts for the more than 1/10 of total cultivated area.Data demonstration in viewpoint of Chinese food safety Forum report in 2009, the arable land of China 1/6 is subject to heavy metal pollution, and contaminated soil area has 2,000 ten thousand hectares at least.
Heavy metal pollution of soil has brought serious consequence: the one, affect farmland quality, and cause direct economic loss.It is estimated, the whole nation reaches 1,200 ten thousand tons because of the grain of heavy metal pollution every year, and the direct economic loss causing is over 20,000,000,000 yuan.The 2nd, affect food security, threaten health.Heavy metal is accumulated in crops, and enters human body by food chain, causes various diseases, is finally detrimental to health.The 3rd, affect the export of farm produce, reduce international competitiveness.Since the nineties in last century, because residues of pesticides and content of beary metal exceed standard, the export of farm produce by foreign side return goods, claim and the event of terminating a contract happen occasionally, the large agricultural product of parts of traditional are also forced to exit international market.Particularly, after China's entry into the World Trade Organization, developed country requires to improve to China's export agricultural product, and outlet pressure increases.Because soil pollution has cumulative bad, hysteresis quality, irreversibility, difficulty of governance is large, cost is high, the cycle is long, by the development of the Long-term Effect economic society.Soil pollution problem has become affects the key factor that the masses are healthy, damage mass interest, threaten agricultural product security.Therefore, the reparation of heavy metal pollution research can not be ignored.
How to repair is a very arduous and important task.At present conventional soil pollution improvement method has the chemical methodes such as the physical methods such as leaching method, soil moved in to improve the original method, absorption fixation and biological reducing method, complex compound extraction.Physical method takes effect slowly, though chemical method is easily brought secondary pollution soon.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only that the form of simplifying provides some concept, usings this as the preorder in greater detail of discussing after a while.
The object of the embodiment of the present invention is the defect for above-mentioned prior art, provides that a kind of cost is low, few to environmental perturbation, the plant restoration method of the cadmium pollution soil that has no side effect.
To achieve these goals, the technical scheme that the present invention takes is:
A plant restoration method for cadmium pollution soil, comprises the following steps:
In the soil of cadmium pollution, plant rye grass, before results, add organic acid; Described organic acid is selected from a kind of in ethylenediamine tetra-acetic acid, oxalic acid, glacial acetic acid, malonic acid, tartaric acid or malic acid.
Compared with prior art, the invention has the beneficial effects as follows:
Method of the present invention is based on rye grass under the prerequisite as biomass material, when with rye grass cadmium pollution soil repair, by organic acid, activate inducing action, improve the biological effectiveness of heavy metal cadmium, promoted the absorption enrichment of plant to cadmium, thereby accelerated heavy-metal contaminated soil phytoremediation speed, organic acid promotes the increase of rye grass aerial part and root system amount of dry matter to a certain extent in addition.Finally reach recovery fertility, promote the long-term goal of regional view harmony, the ecological balance and sustainable development.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of the plant restoration method of cadmium pollution soil provided by the invention;
Fig. 2 is that the present invention adds after the organic acid of different amounts the rye grass variation diagram of dry weight on the ground;
Fig. 3 is the variation diagram that the present invention adds rye grass weight of root system after the organic acid of different amounts;
Fig. 4 is the variation diagram that the present invention adds rye grass plant heavy metal cadmium content after the organic acid of different amounts;
Fig. 5 is that the present invention adds after the organic acid of different amounts soil heavy metal cadmium distribution map again.
The specific embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.The element of describing in an accompanying drawing of the present invention or a kind of embodiment and feature can combine with element and feature shown in one or more other accompanying drawing or embodiment.It should be noted that for purposes of clarity, in accompanying drawing and explanation, omitted expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and processing.Embodiment based in the present invention, those of ordinary skills, not paying the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, the invention provides a kind of plant restoration method of cadmium pollution soil, comprise the following steps:
In the soil of cadmium pollution, plant rye grass, before results, add organic acid; Described organic acid is selected from a kind of in ethylenediamine tetra-acetic acid, oxalic acid, glacial acetic acid, malonic acid, tartaric acid or malic acid.
The present invention, by plantation enriching plant rye grass, applies the organic acid that heavy metal is had to activation, increases the uptake of plant to pollutant, improves the phytoremediation efficiency of heavy-metal contaminated soil, promotes phytoremediation process.
Preferably, described organic acid addition is 1-7mmol/kg.
Preferably, the addition of described ethylenediamine tetra-acetic acid is 1-5mmol/kg, and the addition of described oxalic acid is 5-7mmol/kg, and the addition of described malonic acid is 5-7mmol/kg, and the addition of described glacial acetic acid is 1-3mmol/kg.
By above-mentioned preferred addition, promote to a certain extent the increase of rye grass aerial part and root system amount of dry matter, activated heavy metal in soil cadmium, promote the absorption enrichment of plant to cadmium, improve the remediation efficiency of cadmium pollution soil.
Preferably, the described organic acid interpolation time is for planting the 25-35 days after rye grass.Preferably 30 days, after described plantation rye grass, give in soil and water, make soil moisture reach the 60-80% of field capacity, be the soil moisture scope of plant suitable growth.Field capacity preferably 70%.
The kind of rye grass of the present invention is Taide.Taide is tetraploid annual ryegrass kind.
The content that the present invention is particularly suitable for the Cadmium in Soil of cadmium pollution is 45-55mg/kg, and preferred 50mg/kg, when cadmium content is during in above-mentioned scope, is more conducive to the growth of rye grass.
Below by specific embodiment, the present invention is described further:
In the soil of cadmium pollution, plant rye grass, give in soil and water, make soil moisture reach 80% of field capacity, before results, add ethylenediamine tetra-acetic acid; The addition of ethylenediamine tetra-acetic acid is 1mmol/kg, and before repairing, Cadmium in Soil content is 45mg/kg, Cadmium in Soil content 40.13mg/kg after repairing.
In the soil of cadmium pollution, plant rye grass, give in soil and water, make soil moisture reach 60% of field capacity, in growth, in the time of 30 days, add organic acid; It is oxalic acid that institute adds organic acid, the addition 3mmol/kg of oxalic acid.Before repairing, Cadmium in Soil content is 55mg/kg, and after repairing, Cadmium in Soil content is 42.9mg/kg.Below by list, embodiments of the invention are further described:
Table 1
Wherein, organic acid concentration refers to organic acid addition.
Comparative example:
The concentration of experimental design heavy metal cadmium is 50mg/kg, soil physico-chemical property is in Table 2, EDTA(ethylenediamine tetra-acetic acid), oxalic acid, glacial acetic acid, malonic acid, tartaric acid, malic acid the organic acid adding is:, each organic acid consumption is respectively 1,3,5,6,7mmol/kg.Processing number is :=93 processing of+3 contrasts are repeated in concentration * 3,6 kinds of acid * 5.
Table 2 test is for examination soil physico-chemical property
Adopt root bag to carry out pot experiment, the high 18cm of basin alms bowl, diameter 13cm, soil sample cross apply after 2mm sieve urea, potassium dihydrogen phosphate and potassium nitrate as base fertilizer (according to potted plant standard: N, be 150mg/kg, P
2o
5for 100mg/kg, K
2o is 300mg/kg.Heavy metal cadmium is with CdCl
2form adds, fully mix, then therefrom get 250g soil and pack in root bag, then root bag is imbedded to (2kg/ basin) in the basin alms bowl that same soil is housed, dress basin is front little gravel, nylon wires etc. are all put into basin, to tare, if each basin weight is unequal, available little gravel and sand are adjusted tare weight, each basin is equal in weight, can guarantees that like this gross weight of each basin is in full accord, the calculating irrigation quantity of being convenient to weigh in growth course.Port lid at the bottom of basin is good, add a cover bird's-eye gravel and coarse sand above.On gravel, cover one deck nylon gauze, to prevent that grogs from filling up gravel space, then dress is native.During dress soil, to notice that layering compresses, and the degree of packing of each basin is consistent.Soil density can not be too tight or too loose, and native identity distance basin mouth should stay 2-4cm, to water.After soil installs, pour water and make it fully saturated, when suitable etc. soil moisture, sow ryegrass seed, variety adoption Taide, every bag of final singling 15 strains after emerging.In growing process, adopt weight method to pour into deionized water every day, make soil appropriateness reach 70% of field capacity.During results, regulate the humidity of soil in basin, make the root system can more loosely complete taking-up from root bag, shake off gently soil, the soil of shaking off be Rhizosphere Soil.Soil in basin outside root bag 2cm is non-rhizosphere soil.
The organic acid that adds variety classes variable concentrations during Ryegrass Growth to 30 day, grows and gathers in the crops rye grass 50 days time, minute on the ground and root system two parts gather in the crops.
Mensuration project is: soil sample is divided into Rhizosphere Soil content of beary metal and non-Rhizosphere Soil content of beary metal, plant sample divide aerial part and under ground portion, measures plant dry weight, content of beary metal.
Result of the test is as follows:
(1) oxalic acid of 1-7mmol/kg is, the malonic acid of the EDTA of 1-3mmol/kg and 5-7mmol/kg can promote the increase (referring to Fig. 2) of dry matter weight.Add malic acid, glacial acetic acid, malonic acid and tartaric acid to make rye grass root system have good patience (in Table 3) to the heavy metal cadmium of 50mg/kg.
Fig. 3 plants rye grass on the cadmium pollution soil of 50mg/kg, adds plant root amount of dry matter after variable concentrations and dissimilar organic acid.As seen from the figure, the tartaric acid of 1-7mmol/kg and malonic acid are all conducive to the growth of rye grass root system.
(2) EDTA promotes rye grass aerial part heavy metal Cd
2+the increase of content, glacial acetic acid also has certain facilitation to the concentration effect of rye grass aerial part heavy metal Cd.1-3mmol/kgEDTA and 1-3mmol/kg glacial acetic acid, 5-7mmol/kg oxalic acid is to rye grass root system enrichment Cd
2+facilitation obviously (referring to Fig. 4).
(3) EDTA is conducive to rye grass Heavy Metals In The Rhizosphere Cd most
2+increase, be conducive to most heavy metal Cd
2+active enhancing, the effect of oxalic acid is the poorest.Tartaric acid, the effect close (referring to Fig. 5) of malonic acid and glacial acetic acid.
Rye grass root growth parameters under table 3 different organic acids condition
The present invention's test shows to plant rye grass in the farmland of cadmium pollution, the inducing action of Exogenous Organic Acids can promote the increase of rye grass aerial part and root system amount of dry matter to a certain extent, activated heavy metal in soil cadmium, promote the absorption enrichment of plant to cadmium, improve the remediation efficiency of cadmium pollution soil, accelerate polluted soil phyto repair process, finally reach recovery fertility, promote the long-term goal of the ecological balance and sustainable development.
In the various embodiments described above of the present invention, the sequence number of embodiment is only convenient to describe, and does not represent the quality of embodiment.Description to each embodiment all emphasizes particularly on different fields, and there is no the part of detailed description in certain embodiment, can be referring to the associated description of other embodiment.
In the embodiment such as apparatus and method of the present invention, obviously, each parts or each step reconfigure after can decomposing, combine and/or decomposing.These decomposition and/or reconfigure and should be considered as equivalents of the present invention.Simultaneously, in the above in the description of the specific embodiment of the invention, the feature of describing and/or illustrating for a kind of embodiment can be used in same or similar mode in one or more other embodiment, combined with the feature in other embodiment, or substitute the feature in other embodiment.
Should emphasize, term " comprises/comprises " existence that refers to feature, key element, step or assembly while using herein, but does not get rid of the existence of one or more further feature, key element, step or assembly or add.
Finally it should be noted that: although described above the present invention and advantage thereof in detail, be to be understood that in the situation that do not exceed the spirit and scope of the present invention that limited by appended claim and can carry out various changes, alternative and conversion.And scope of the present invention is not limited only to the specific embodiment of the described process of description, equipment, means, method and step.One of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use carry out with the essentially identical function of corresponding embodiment described herein or obtain process, equipment, means, method or step result essentially identical with it, that existing and will be developed future according to the present invention.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
Claims (9)
1. a plant restoration method for cadmium pollution soil, is characterized in that, comprises the following steps:
In the soil of cadmium pollution, plant rye grass, before results, add organic acid; Described organic acid is selected from a kind of in ethylenediamine tetra-acetic acid, oxalic acid, glacial acetic acid, malonic acid, tartaric acid or malic acid.
2. the plant restoration method of cadmium pollution soil according to claim 1, is characterized in that, described organic acid addition is 1-7mmol/kg.
3. the plant restoration method of cadmium pollution soil according to claim 2, it is characterized in that, the addition of described ethylenediamine tetra-acetic acid is 1-5mmol/kg, the addition of described oxalic acid is 5-7mmol/kg, the addition of described malonic acid is 5-7mmol/kg, and the addition of described glacial acetic acid is 1-3mmol/kg.
4. the plant restoration method of cadmium pollution soil according to claim 1, is characterized in that, the described organic acid interpolation time is for planting the 25-35 days after rye grass.
5. the plant restoration method of cadmium pollution soil according to claim 1, is characterized in that, after described plantation rye grass, gives in soil and waters, and makes soil moisture reach the 60-80% of field capacity.
6. the plant restoration method of cadmium pollution soil according to claim 5, is characterized in that, described field capacity is 70%.
7. according to the plant restoration method of the cadmium pollution soil described in claim 1-6 any one, it is characterized in that, the kind of described rye grass is Taide.
8. according to the plant restoration method of the cadmium pollution soil described in claim 1-6 any one, it is characterized in that, the content of the Cadmium in Soil of described cadmium pollution is 45-55mg/kg.
9. the plant restoration method of cadmium pollution soil according to claim 8, is characterized in that, the content of the Cadmium in Soil of described cadmium pollution is 50mg/kg.
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| CN104591902A (en) * | 2015-02-02 | 2015-05-06 | 中国科学院沈阳应用生态研究所 | Method for fast passivating heavy metals in organic fertilizer/agricultural soil |
| CN104718934A (en) * | 2015-02-15 | 2015-06-24 | 河北联合大学 | Method for assisting in tailings restoration through ryegrass and planting ryegrass on restored land |
| CN104984987A (en) * | 2015-06-23 | 2015-10-21 | 沈阳大学 | Method for screening lead/cadmium repair tolerant plants from metal smelting region |
| CN105057334A (en) * | 2015-09-11 | 2015-11-18 | 浙江农林大学 | Enhancer for moso bamboo-remediated heavy metal pollution soil |
| CN105170627A (en) * | 2015-10-20 | 2015-12-23 | 南京工业大学 | Method for repairing cadmium-polluted soil by combination of microorganisms and plants |
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| CN106862266A (en) * | 2017-04-26 | 2017-06-20 | 重庆文理学院 | A kind of restorative procedure of severe heavy-metal composite pollution soil |
| CN108126976A (en) * | 2018-02-01 | 2018-06-08 | 煜环环境科技有限公司 | A kind of method that chromium-polluted soil is repaired using plant rye grass |
| CN110026420A (en) * | 2019-04-16 | 2019-07-19 | 浙江大学 | A method of cadmium slight pollution farmland is repaired using wheat |
| CN110116133A (en) * | 2019-05-13 | 2019-08-13 | 中国农业科学院农田灌溉研究所 | A kind of Soil Micro-environment abductive approach |
| CN110508601A (en) * | 2019-08-15 | 2019-11-29 | 昆山菲斯勒生态科技有限公司 | Charcoal repair materials and restorative procedure |
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| CN111299316A (en) * | 2019-11-25 | 2020-06-19 | 中节能大地环境修复有限公司 | Plant extraction-agronomic regulation combined remediation method for slightly-alkaline heavy metal contaminated farmland soil |
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| CN113751494A (en) * | 2021-09-01 | 2021-12-07 | 环保桥(湖南)生态环境工程股份有限公司 | Method capable of accelerating removal of heavy metals in soil and realizing safe production of crops |
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| WO2016029731A1 (en) * | 2014-08-27 | 2016-03-03 | 中国水稻研究所 | Activator for soil heavy metal and preparation method therefor |
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| CN105170627A (en) * | 2015-10-20 | 2015-12-23 | 南京工业大学 | Method for repairing cadmium-polluted soil by combination of microorganisms and plants |
| CN106862266A (en) * | 2017-04-26 | 2017-06-20 | 重庆文理学院 | A kind of restorative procedure of severe heavy-metal composite pollution soil |
| CN108126976A (en) * | 2018-02-01 | 2018-06-08 | 煜环环境科技有限公司 | A kind of method that chromium-polluted soil is repaired using plant rye grass |
| CN110026420A (en) * | 2019-04-16 | 2019-07-19 | 浙江大学 | A method of cadmium slight pollution farmland is repaired using wheat |
| CN110116133A (en) * | 2019-05-13 | 2019-08-13 | 中国农业科学院农田灌溉研究所 | A kind of Soil Micro-environment abductive approach |
| CN110508601A (en) * | 2019-08-15 | 2019-11-29 | 昆山菲斯勒生态科技有限公司 | Charcoal repair materials and restorative procedure |
| CN110885689A (en) * | 2019-11-22 | 2020-03-17 | 武汉科技大学 | Mining area soil composite improver and mining area soil improvement method |
| CN111299316A (en) * | 2019-11-25 | 2020-06-19 | 中节能大地环境修复有限公司 | Plant extraction-agronomic regulation combined remediation method for slightly-alkaline heavy metal contaminated farmland soil |
| CN113351640A (en) * | 2021-06-03 | 2021-09-07 | 西安理工大学 | Method for repairing cadmium and lead combined polluted soil by combining chelating agent with ryegrass |
| CN113751494A (en) * | 2021-09-01 | 2021-12-07 | 环保桥(湖南)生态环境工程股份有限公司 | Method capable of accelerating removal of heavy metals in soil and realizing safe production of crops |
| CN114101320A (en) * | 2021-12-08 | 2022-03-01 | 沈阳大学 | Method for repairing tris (1-chloro-2-propyl) phosphate contaminated soil by utilizing gramineous ryegrass |
| CN114160570A (en) * | 2021-12-08 | 2022-03-11 | 中国农业科学院农田灌溉研究所 | Remediation method for heavy metal cadmium contaminated soil |
| CN114289498A (en) * | 2022-01-04 | 2022-04-08 | 桂林理工大学 | Bioremediation method for heavy metal contaminated soil |
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| CN103521508B (en) | 2014-12-31 |
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