CN104984990A - Method for recycling combined pollution farmland soil after leaching remediation - Google Patents
Method for recycling combined pollution farmland soil after leaching remediation Download PDFInfo
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- CN104984990A CN104984990A CN201510401324.0A CN201510401324A CN104984990A CN 104984990 A CN104984990 A CN 104984990A CN 201510401324 A CN201510401324 A CN 201510401324A CN 104984990 A CN104984990 A CN 104984990A
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- drip washing
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- loess
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Abstract
The invention provides a method for recycling combined pollution farmland soil after leaching remediation. The method includes the steps that first, the preliminary remediation process of lead/cadmium combined pollution soil is mainly completed through a leaching method; second, reestablishment and remediation of the ecological functions of the polluted soil are mainly achieved by planting remediation plants such as calendula officinalis or carrot or oilseed rape, so that recycling soil is obtained. After the two remediation steps are completed, the physicochemical indexes and biological indexes of the soil are both optimized, and parts of parameter values have already approached or reached the corresponding parameter values in unpolluted loess. The method has the advantages that the defects on the aspect of recycling ways after the polluted soil is recovered are overcome, the recycling potential of the farmland soil after remediation and the restoration effect of the ecological functions are good, the period is short, the cost is low, operation is easy and convenient, safety is good, and potential application and popularization value is achieved.
Description
Technical field
The present invention relates to the reuse method that after stain soil is repaired in drip washing, be specifically related to the reuse method of combined pollution agricultural land soil after a kind of drip washing reparation.
Background technology
Pedosphere is the basic interface of global ecological environment system, is that material recycle and energy flow enliven one of ring layer most, becomes the main receptor of environmental contaminants natively.In recent years, along with development that is economic and society, soil pollution also became more and more serious.Soil pollution has the features such as irreversibility, disguise, hysteresis quality, plyability, and repairing and treating difficulty is very large.The contaminated soil remediation technology of current main flow comprises chemical leaching method, steam soaking formulation, electrodynamics method, chemistry redox method, microorganism-phytoremediation etc., wherein chemical leaching method is comparatively ripe, and the aspects such as treatment cost, repairing effect, pollution risk are more easily accepted relatively, obtain practical application in some contaminated site reparations.
Generally, the short-term object of contaminated soil remediation soil pollutant is reached or lower than the concentration level of national standard, its ultimate aim is then the System recover and the sustainable use that realize soil ecology function.And soil recovers ecological functions as early as possible and has become current major issue urgently to be resolved hurrily after how making reparation.
Summary of the invention
The object of the present invention is to provide the reuse method of combined pollution agricultural land soil after a kind of drip washing reparation.
In order to achieve the above object, the technical solution used in the present invention is:
1) adopt leacheate drip washing heavy-metal composite pollution agricultural land soil no longer to decline to the content of heavy metal in soil, obtain agricultural land soil after drip washing reparation;
2) after drip washing reparation, plant pot marigold, carrot or rape in agricultural land soil, in agricultural land soil after described drip washing reparation, water pure water between planting season, after maintaining described drip washing reparation, agricultural land soil water-holding capacity is 60% ~ 70% of field capacity; Implantation time is 55 ~ 65 days, removes the pot marigold of plantation, carrot or rape, obtain the recycling soil that ecological functions are restored after plantation terminates.
Described agricultural land soil is loess, and heavy metal is plumbous and cadmium.
Described leacheate is EDTA solution, and EDTA solution is made into by EDTA and sewage treatment plant Zhong Shui.
Before planting, apply base fertilizer to agricultural land soil after drip washing reparation, described base fertilizer applied amount is urea 0.4g/kg, sodium dihydrogen phosphate 0.2g/kg and potassium chloride 0.3g/kg.
The method of described plantation is directly sowing: to be directly seeded in by the seed of pot marigold, carrot or rape after drip washing reparation in agricultural land soil.
Beneficial effect of the present invention is embodied in:
The invention provides the reuse method of combined pollution agricultural land soil after a kind of drip washing reparation, the first step, elution method is adopted mainly to complete lead/preliminary repair process of cadmium combined pollution soil, content of beary metal is significantly reduced, second step, mainly complete reconstruction for contaminated soil ecological functions and recovery by the rehabilitation plant such as plantation pot marigold, carrot or rape, obtain recycling soil.
Compared with prior art, the invention has the advantages that:
One, recycle the deficiency of approach aspect after compensate for contaminated soil remediation, recycling potentiality and the ecological functions recovery effects of repairing rear agricultural land soil (such as loess) are good.
Two, the cycle is shorter, with low cost, easy and simple to handle, security is good, has potential application value.
Three, after two steps are repaired, soil physico-chemical index and biological indicator are optimized all to some extent, partial parameters value close to or the corresponding parameter value that reaches in uncontaminated loess.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
(1) basin alms bowl experimental method
The experiment of basin alms bowl is carried out in Shaanxi Tech Univ campus, cultivates (incubation time is on May 28,28 days to 2015 March in 2015), do not have pollution sources around experimental site under adopting outdoor natural endowment.Loess former state used takes from inner southern side, the Shaanxi Tech Univ campus woods-herbal vegetation band, and Loess Samples basic physical and chemical is in table 1.Lead/cadmium combined pollution loess adopts analytically pure Pb (NO
3)
2, CdCl
22.5H
2water preparation (ageing time is 60d) in O and sewage treatment plant, wherein combined pollutant be lead and cadmium; With EDTA solution (EDTA+ sewage treatment plant Zhong Shui) for leacheate, repairing polluted soil in streaming column type reactor is falling continuously.Wherein EDTA concentration is 0.01mol/L, and leacheate flow velocity is 20mL/min, and pH value is 6, and drip washing temperature is 25 DEG C, and the drip washing time is 4h.
Loess after drip washing being repaired loads circular flowerpot (diameter 20cm, high 15cm), every basin fills native 1kg, arrange and apply base fertilizer and do not apply base fertilizer and contrast (described base fertilizer applied amount is urea 0.4g/kg loess, sodium dihydrogen phosphate 0.2g/kg loess and potassium chloride 0.3g/kg loess), 100 plants (pot marigold, carrot, rape) seed is directly sown into after balance 24h, regularly water pure water, make water capacity remain on 60% ~ 70% of field capacity.Each processed group establishes 3 repetitions, regularly investigates the Testing index of plant sample and soil.
Table 1 Loess Samples basic physical and chemical
(2) experiment grouping
Experiment is divided into five large groups, be respectively " loess former state+do not add base fertilizer ", " the front loess of reparation+do not add base fertilizer ", " before repairing loess+applying base fertilizer ", " the rear loess of reparation+do not add base fertilizer " and " after reparation loess+applying base fertilizer ", floristics is pot marigold (flowers class), carrot (root vegetables), rape (leaf vegetables) three kinds; The indices parameter of periodic evaluation experimental plant, comprise emergence rate (seed break ground emerge number/sowing seed sum × 100%), seedling-growing time, plant height, biomass (fresh weight) etc., detect simultaneously single class (drip washing or planting plants reparation) repair after and two step reparations after soil physical chemistry and ecological functions index (table 1 ~ table 15).
(3) experimental result
Table 2 ~ table 4 is pot marigold in loess after drip washing reparation, the emergence rate result of carrot and rape.Result shows: before repairing, plant emergence rate is general lower in loess, and after drip washing reparation in loess the emergence rate of three Plants higher.For pot marigold, before repairing, loess pot marigold emergence rate is respectively 38% (60d, do not add base fertilizer) and 42% (60d, apply base fertilizer), and the corresponding emergence rate of loess pot marigold reaches 66% and 80% respectively after drip washing reparation, after drip washing reparation, loess pot marigold emergence rate has before comparatively repairing and significantly promotes.Meanwhile, in loess after drip washing reparation (60d applies base fertilizer), pot marigold emergence rate is 80%, and in this and loess former state, pot marigold emergence rate (89%) is very close, and after drip washing reparation is described, soil may be used for second step and plants corresponding plant.In addition, do not adding in base fertilizer situation, drip washing is respectively 38% and 66% with the emergence rate (60d) repairing pot marigold in rear loess before repairing, and after applying base fertilizer, emergence rate brings up to 42% and 80% respectively, and this illustrates the Integral lifting applying base fertilizer and contribute to plant emergence rate.
The dynamic differential of front and back loess pot marigold emergence rate repaired by table 2
The dynamic differential of front and back loess carrot emergence rate repaired by table 3
The dynamic differential of front and back loess rape emergence rate repaired by table 4
Table 5 for drip washing repair before and after pot marigold in Contaminated Loess, carrot and rape seedling-growing time difference.Found that: in Contaminated Loess, the seedling-growing time of three Plants is generally delayed, and the plant emergence time after drip washing reparation in loess generally shortens.Such as, under applying base fertilizer condition, the seedling-growing time of pot marigold in loess after drip washing reparation, carrot and rape is respectively 7,14 and 10d, closely the seedling-growing time of three Plants in loess former state, and after this illustrates drip washing reparation again, soil may be used for second step and plants corresponding plant.
Table 5 repairs front and back loess pot marigold, carrot and rape seedling-growing time difference
Table 6 ~ table 8 for drip washing repair before and after pot marigold in Contaminated Loess, carrot and rape plant height dynamic differential.Found that: loess pollutes and causes the growth rate of three Plants to slow down, be embodied in plant plant height general less.Such as, do not adding in the Contaminated Loess of base fertilizer, the plant height (60d) of pot marigold, carrot and rape is only 11.3,3.6 and 4.5mm, and this differs larger with three Plants plant heights in loess former state.Contaminated Loess is after drip washing is repaired, plant strain height significantly increases: to apply base fertilizer processed group, through the cultivation of 60d, the plant height of pot marigold, carrot and rape reaches 26.9,7.9 and 7.9mm respectively, plant plant height in this and loess former state is comparatively close, and after this illustrates drip washing reparation, loess can ensure that the normal growth of plant is grown.
The dynamic differential of front and back loess pot marigold plant height repaired by table 6
The dynamic differential of front and back loess carrot plant height repaired by table 7
The dynamic differential of front and back loess rape plant height repaired by table 8
Table 9 ~ table 11 for drip washing repair before and after pot marigold in Contaminated Loess, carrot and Oilseed rape biomass (fresh weight) dynamic differential.Found that: loess pollutes and causes three Plants biomass (fresh weight) all to decrease, and the amplitude of reduction is larger.Such as, in Contaminated Loess (not adding base fertilizer process), cultivation cycle is the pot marigold of 60d, the biomass (fresh weight) of carrot and rape is only 1.0942,0.1068 and 0.5201g, and this and the corresponding parameter 5.7721,0.1913 in loess former state are compared with 3.5321g and differed greatly.Contaminated Loess is after drip washing is repaired, and three Plants biomass (fresh weight) obviously increase.To apply base fertilizer processed group, the biomass (fresh weight) of pot marigold after 60d, carrot and rape reaches 3.8658,0.1365 and 2.8521g respectively, and after this illustrates drip washing reparation, loess can ensure that the normal growth of plant is grown.
The dynamic differential of front and back loess pot marigold biomass (fresh weight) repaired by table 9
The dynamic differential of front and back loess carrot biological amount (fresh weight) repaired by table 10
The dynamic differential of front and back loess Oilseed rape biomass (fresh weight) repaired by table 11
Table 12 ~ table 15, for repairing front and back loess ecological functions indicator difference situation, comprises physical and chemical index and biological indicator two aspect.For not applying base fertilizer control group, before repairing, loess differs larger with loess former state indices; But relevant parameter improves and optimizes after two step reparations, index difference corresponding to loess former state reduces, and some index is very close; Repair loess with loess, separately drip washing before reparation to compare with independent phytoremediation loess, after two step reparations, loess ecological functions totally obtain larger recovery.Applying base fertilizer has facilitation for the improvement of loess ecological functions, and under this study condition, loess base fertilizer applied amount is lower, and this illustrates that repair process (no matter whether applying base fertilizer) is quick-acting and efficient for the recovery of loess ecological functions.
The difference of front loess ecological functions index repaired by table 12
The difference of rear loess ecological functions index repaired by table 13 (a step drip washing)
The difference of rear loess ecological functions index repaired by table 14 (a step plant)
The difference of rear loess ecological functions index repaired by table 15 (two steps)
Claims (5)
1. the reuse method of combined pollution agricultural land soil after drip washing reparation, is characterized in that: comprise the following steps:
1) adopt leacheate drip washing heavy-metal composite pollution agricultural land soil no longer to decline to the content of heavy metal in soil, obtain agricultural land soil after drip washing reparation;
2) after drip washing reparation, plant pot marigold, carrot or rape in agricultural land soil, in agricultural land soil after described drip washing reparation, water pure water between planting season, after maintaining described drip washing reparation, agricultural land soil water-holding capacity is 60% ~ 70% of field capacity; Implantation time is 55 ~ 65 days, removes the pot marigold of plantation, carrot or rape, obtain the recycling soil that ecological functions are restored after plantation terminates.
2. the reuse method of combined pollution agricultural land soil after a kind of drip washing reparation according to claim 1, it is characterized in that: described agricultural land soil is loess, heavy metal is plumbous and cadmium.
3. the reuse method of combined pollution agricultural land soil after a kind of drip washing reparation according to claim 1, it is characterized in that: described leacheate is EDTA solution, EDTA solution is made into by EDTA and sewage treatment plant Zhong Shui.
4. the reuse method of combined pollution agricultural land soil after a kind of drip washing reparation according to claim 1, it is characterized in that: before planting, apply base fertilizer to agricultural land soil after drip washing reparation, described base fertilizer applied amount is urea 0.4g/kg, sodium dihydrogen phosphate 0.2g/kg and potassium chloride 0.3g/kg.
5. the reuse method of combined pollution agricultural land soil after a kind of drip washing reparation according to claim 1, is characterized in that: the method for described plantation is directly sowing: to be directly seeded in by the seed of pot marigold, carrot or rape after drip washing reparation in agricultural land soil.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105458000A (en) * | 2016-01-13 | 2016-04-06 | 南京信息工程大学 | Method for remediating mercury-contaminated soil by combining byproduct ammonium thiosulfate with calendula officinalis |
| CN106694532A (en) * | 2016-12-26 | 2017-05-24 | 湖南金旅环保股份有限公司 | Method for repairing cadmium-polluted farmland soil |
| CN112207122A (en) * | 2020-09-23 | 2021-01-12 | 内蒙古农业大学 | Method for remedying heavy metal pollution of calcareous soil |
| WO2021064143A1 (en) * | 2019-10-04 | 2021-04-08 | Biomede | Phytoextraction composition and its use in the extraction of at least one heavy metal present in a soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104028551A (en) * | 2014-06-11 | 2014-09-10 | 陕西科技大学 | Ex-situ intensified washing method for chlorpyrifos contaminated soil |
| CN104668281A (en) * | 2015-03-17 | 2015-06-03 | 中国科学院南京土壤研究所 | Chemical washing-plant absorbing combined repair method for cadmium heavy pollution acid soil of non-ferrous metal mining area of south China |
-
2015
- 2015-07-09 CN CN201510401324.0A patent/CN104984990A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028551A (en) * | 2014-06-11 | 2014-09-10 | 陕西科技大学 | Ex-situ intensified washing method for chlorpyrifos contaminated soil |
| CN104668281A (en) * | 2015-03-17 | 2015-06-03 | 中国科学院南京土壤研究所 | Chemical washing-plant absorbing combined repair method for cadmium heavy pollution acid soil of non-ferrous metal mining area of south China |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105458000A (en) * | 2016-01-13 | 2016-04-06 | 南京信息工程大学 | Method for remediating mercury-contaminated soil by combining byproduct ammonium thiosulfate with calendula officinalis |
| CN106694532A (en) * | 2016-12-26 | 2017-05-24 | 湖南金旅环保股份有限公司 | Method for repairing cadmium-polluted farmland soil |
| WO2021064143A1 (en) * | 2019-10-04 | 2021-04-08 | Biomede | Phytoextraction composition and its use in the extraction of at least one heavy metal present in a soil |
| CN114554836A (en) * | 2019-10-04 | 2022-05-27 | 拜尔麦德公司 | Plant extract composition and use thereof for extracting at least one heavy metal present in soil |
| CN112207122A (en) * | 2020-09-23 | 2021-01-12 | 内蒙古农业大学 | Method for remedying heavy metal pollution of calcareous soil |
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Application publication date: 20151021 |
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