CN115011356A - Composition with function of repairing heavy metal contaminated soil and application thereof - Google Patents
Composition with function of repairing heavy metal contaminated soil and application thereof Download PDFInfo
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- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- C05—FERTILISERS; MANUFACTURE THEREOF
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- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
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- C05G3/80—Soil conditioners
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Abstract
The invention relates to the technical field of polluted soil restoration, and discloses a composition with a function of restoring heavy metal polluted soil and an application thereof, wherein the composition comprises natural zeolite, polyaluminum ferric chloride, brucite and fermented conifer barks, wherein the weight ratio of the natural zeolite to the polyaluminum ferric chloride to the brucite to the fermented conifer barks is 100: 10-30: 5-20: 5-15. The composition provided by the invention can effectively reduce the content of the effective state of the heavy metal in the farmland soil and the content of the heavy metal in crops, thereby achieving the purpose of repairing the polluted soil.
Description
Technical Field
The invention belongs to the technical field of contaminated soil remediation, and particularly relates to a composition with a function of remediating heavy metal contaminated soil and application thereof.
Background
In order to comprehensively implement the national soil pollution prevention and control law, according to the relevant requirements of the relevant agricultural land classified management, the ecological environment protection of the farmland soil is enhanced, the agricultural land soil environmental quality and the agricultural product safety of the city are guaranteed, the farmland needs to be managed in a grading mode (priority protection, safe utilization and strict control), and the safe utilization type land needs to be repaired and treated.
The technical principle of the heavy metal pollution remediation technology of the farmland soil can be summarized as follows: (1) the aim of reducing the pollution risk is to reduce the migration and bioavailability of the pollutants in the environment by changing the existing forms of the pollutants in the soil or combining the pollutants with the soil; (2) the aim is to reduce the total amount of pollution, i.e. to remove the harmful substances from the soil by a treatment in order to reduce the total concentration of harmful substances in the soil.
Based on the basic principle, scientists and agricultural practitioners at home and abroad propose various restoration technology types such as physical, chemical, biological and agricultural regulation and the like throughout the year. According to survey, the heavy metal pollution area of farmland soil in China is huge, and medium-light pollution is mainly used. The technology for safely utilizing the heavy metal pollution of the farmland soil needs to firstly consider agricultural production modes and types, ensure the repairing effect, and simultaneously ensure that the environment quality of the repaired soil can not obviously change, the normal production of agriculture can not be influenced, and secondly consider effectiveness, economy and popularization. At present, the main restoration technology for restoring heavy metal pollution of farmland comprises the following steps: such as engineering measures, agricultural regulation, soil improvement, bioremediation and the like.
However, most of the existing remediation technologies are not suitable for the remediation of large-area soil pollution or have low heavy metal removal rate, so that a remediation and treatment technology which can effectively reduce the heavy metal content in soil and can be applied in a large area is needed.
Disclosure of Invention
The invention aims to overcome the problem that the content of heavy metal in soil exceeds the standard in the prior art, and provides a composition with a function of repairing heavy metal contaminated soil and application thereof.
In order to achieve the above object, the present invention provides a composition having a function of remediating heavy metal contaminated soil, the composition comprising natural zeolite, polyaluminum ferric chloride, brucite and fermented conifer bark, wherein the weight ratio of the natural zeolite, the polyaluminum ferric chloride, the brucite and the fermented conifer bark is 100: 10-30: 5-20: 5-15.
The invention also provides an application of the composition in heavy metal contaminated soil remediation.
In a third aspect, the invention provides a method for remediating heavy metal contaminated soil, which comprises the following steps: applying the composition to the soil of a farmland and then carrying out at least one turn-over; wherein the soil of the farmland is heavy metal polluted soil.
Through the technical scheme, the invention has the following beneficial effects:
(1) the farmland heavy metal contaminated soil composition can effectively reduce the effective state content of the farmland heavy metal and the heavy metal content in crops, thereby achieving the purpose of restoring the contaminated soil.
(2) The farmland heavy metal contaminated soil composition disclosed by the invention is simple in preparation process, easy to construct and operate, can be prepared only by drying, grinding and mixing, is energy-saving, low in cost, convenient to construct and apply, obvious in remediation effect, persistent in effect, wide in application range and extremely high in market popularization value.
(3) The fermented conifer barks are matched with natural zeolite, polymeric aluminum ferric chloride and brucite according to the proportion for use, so that on one hand, chemical groups on cellulose can be completely exposed from a bound state, organic matters such as pectin and the like are degraded, the content of the chemical groups in the repairing material is greatly increased, the solidifying capacity of the repairing material to heavy metals is obviously enhanced, the heavy metals in polluted soil can be effectively passivated, the heavy metals are prevented from entering a food chain, and the food completeness is favorably ensured; on the other hand, the fertilizer can play a better role in organic fertilizer, is beneficial to improving soil quality and improving the ecological environment of soil, and is more beneficial to the growth of crops.
(4) The farmland heavy metal contaminated soil composition is easy to apply, farmland fallow is not needed during application, the farmland heavy metal contaminated soil composition is applied in an idle period, agricultural planting is not affected, and the farmland soil property is not changed.
Drawings
FIG. 1 is a graph showing the effect of composition A prepared in example 1 on the cadmium content in rice;
FIG. 2 is the effect of composition A prepared in example 1 on the cadmium content of wheat;
FIG. 3 is a graph of the effect of composition A prepared in example 1 on available cadmium content in soil;
FIG. 4 is the effect of composition B prepared in example 2 on the mercury content of wheat;
FIG. 5 is the effect of composition B prepared in example 2 on the available mercury content in soil;
FIG. 6 is a graph of the effect of composition C prepared in example 3 on cadmium content in vegetables;
FIG. 7 is a graph of the effect of composition C prepared in example 3 on available cadmium content in soil;
FIG. 8 is the effect of composition D prepared in comparative example 1 on the cadmium content of wheat;
FIG. 9 is a graph showing the effect of composition D prepared in comparative example 1 on the available cadmium content in soil.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a composition with a function of repairing heavy metal contaminated soil, which comprises natural zeolite, polyaluminium ferric chloride, brucite and fermented conifer barks, wherein the weight ratio of the natural zeolite to the polyaluminium ferric chloride to the brucite to the fermented conifer barks is 100: 10-30: 5-20: 5-15.
According to the present invention, it is preferable that the weight ratio of the natural zeolite, the polyaluminium ferric chloride, the brucite and the fermented conifer bark is 100: 15-30: 15-20: 10-15. By adopting the preferred embodiment, the content of elements such as cadmium, copper, zinc or lead in the soil can be better reduced.
According to the present invention, it is preferable that the weight ratio of the natural zeolite, the polyaluminum ferric chloride, the brucite and the fermented conifer bark is 100: 10-20: 10-20: 5-10. By adopting the preferred embodiment, the content of elements such as mercury, arsenic or chromium in the soil can be better reduced.
According to the present invention, preferably, the natural zeolite is at least one of clinoptilolite, mordenite and phillipsite (a calcium-based zeolite).
According to the present invention, preferably, the conifer bark is a bark of at least one of pine, cedar and palm.
According to the present invention, preferably, the method for preparing the fermented conifer bark comprises: sequentially performing first drying and first pulverizing on needle-leaf bark, fermenting at 40-60 deg.C and humidity of 60-70%, and performing second drying and second pulverizing.
The first drying according to the invention is not particularly restricted and may be performed in a manner commonly used in the art, such as air drying, preferably at a temperature of 15-50 c for a time such that the moisture content of the bark is below 30%, more preferably below 20%.
According to the present invention, the first pulverization method is not particularly limited, and pulverization may be performed using a pulverizer, and preferably, the first pulverization is performed under conditions such that the particle size of the conifer bark is 30 to 60 mesh. It is understood that "particle size of 30-60 mesh" means that a 30 mesh screen is used to select the material below the screen, and a 60 mesh screen is used to select the material above the screen.
The second drying according to the invention is not particularly restricted and can be performed in a manner customary in the art, such as air drying, preferably at a temperature of 15-50 c for a time such that the moisture content of the bark is less than 20%, more preferably less than 10%.
According to the present invention, the second pulverization method is not particularly limited, and pulverization may be performed using a pulverizer, and preferably, the second pulverization is performed under conditions such that the particle size of the conifer bark is 60 to 100 mesh. It is understood that "particle size is 60-100 mesh" means that the material below the screen is selected by sieving with a 60 mesh screen and the material above the screen is selected by sieving with a 100 mesh screen.
According to the present invention, it is preferable that the particle sizes of the natural zeolite, the polyaluminum ferric chloride, the brucite and the fermented conifer bark are each independently in the range of 60-100 mesh.
The invention also provides an application of the composition in heavy metal contaminated soil remediation.
In a third aspect, the invention provides a method for remediating heavy metal contaminated soil, which comprises the following steps: applying the composition to the soil of a farmland and then carrying out at least one turn-over; wherein the soil of the farmland is heavy metal contaminated soil.
According to the invention, the rotary cultivator used for turning over is preferably a horizontal shaft type rotary cultivator.
According to the invention, the plowing depth is preferably greater than or equal to 20cm (for example, 20cm, 21cm, 22cm, 23cm, 24cm, 25cm, 26cm, 27cm, 28cm, 29cm, 30cm), preferably 20-25 cm.
According to the present invention, preferably, the heavy metal includes at least one of cadmium, copper, zinc, lead, mercury, arsenic and chromium.
According to the present invention, it is preferable that the content of heavy metals in the heavy metal contaminated soil is 0.3 to 3000 mg/kg.
According to the invention, the content of cadmium in the heavy metal contaminated soil is preferably 0.3-20 mg/kg.
According to the invention, the content of copper in the heavy metal contaminated soil is preferably 50-100 mg/kg.
According to the invention, the content of zinc in the heavy metal contaminated soil is preferably 200-1000 mg/kg.
According to the invention, the lead content in the heavy metal contaminated soil is preferably 70-1000 mg/kg.
According to the invention, the mercury content in the heavy metal contaminated soil is preferably 0.5-10 mg/kg.
According to the invention, the content of arsenic in the heavy metal contaminated soil is preferably 20-200 mg/kg.
According to the invention, the content of chromium in the heavy metal contaminated soil is preferably 150-1500 mg/kg.
According to the present invention, it is preferable that the composition is applied in an amount of 800-3000kg per mu of farmland.
According to the invention, after the polluted farmland is repaired, at least one of crops including rice, wheat and vegetables (cauliflower, Chinese cabbage and green vegetables) can be planted. The field management after planting is consistent with the daily field management.
The present invention will be described in detail below by way of examples. In the following examples of the present invention,
clinoptilolite is a commercially available product of Zhejiang Shenshi mining company, Inc.
In the embodiment, the effect of the passivator on repairing heavy metal polluted soil is evaluated by an effective heavy metal passivation coefficient and a crop seed enrichment coefficient. The effective heavy metal passivation coefficient refers to a comparison result of the effective heavy metal content in each treatment and the effective heavy metal content in a blank control group, and the calculation formula is as follows:
the passivation coefficient is (the content of the control group of the effective heavy metal, namely the content of the treatment group of the effective heavy metal) per the content of the control group of the effective heavy metal.
Example 1
(1) The preparation method of fermented conifer bark comprises: subjecting pine bark to first drying (at about 25 deg.C for a time sufficient to achieve a moisture content of 15%) and first pulverizing (under conditions such that the bark has a particle size of 30-60 mesh), fermenting at 50 deg.C and a humidity of 65%, and further subjecting to second drying (at about 50 deg.C for a time sufficient to achieve a moisture content of 9%) and second pulverizing (under conditions such that the bark has a particle size of 60-100 mesh).
(2) Clinoptilolite (60-100 meshes), polyaluminium ferric chloride (60-100 meshes), brucite (60-80 meshes) and the fermented conifer bark prepared in step (1) are independently crushed into 60-100 meshes, and then the mixture is mixed according to the ratio of 100: 30: 20: 10 to obtain a mixed composition A.
Application example 1
This application example illustrates the use of composition A prepared in example 1 to remediate soil
In a farmland containing cadmium pollution in Jiangsu province (before test, the cadmium content in the soil is 2.58mg/kg, and the cadmium content in an effective state is 0.87mg/kg), the test field is set according to the area of a natural field block, a control group (CK group) and a treatment group (SLA group) are set, the control group is not applied with the composition A, and the treatment group is respectively applied with 1000 kg/mu (namely, the adding proportion is 1%), 2500 kg/mu (namely, the adding proportion is 2.5%) and 3000 kg/mu (namely, the adding proportion is 3%) of the composition A prepared in example 1. The field management follows the optimal and consistent principle, and the control group and the treatment group have consistent measures of fertilization, weeding and irrigation except that the composition A is applied differently and meet the production requirements.
The tested crops are rice (5055) and wheat (poplar 22), and the rice and wheat are sowed in a rotation mode.
Planting rice: setting a control group and a treatment group in a test paddling area, ploughing (adopting a horizontal shaft type rotary cultivator for ploughing, the ploughing depth of the ploughing is 20cm), applying the composition A, ploughing (adopting a horizontal shaft type rotary cultivator for ploughing, the ploughing depth of the ploughing is 20cm), then planting rice, and collecting soil samples and rice samples of each group of plough layers after the rice is mature.
After harvesting the rice, planting the wheat: ploughing (adopting a horizontal shaft type rotary cultivator for ploughing, wherein the ploughing depth is 20cm), then planting wheat, and collecting soil samples of each plough layer and wheat samples after the wheat is mature in the next year.
After harvesting wheat, rice planting: ploughing (adopting a horizontal shaft type rotary cultivator for ploughing, wherein the ploughing depth is 20cm), then planting rice, and collecting soil samples of each group of plough layers and rice samples after the rice is mature.
Cadmium content in rice and wheat grains is detected according to the standard of determination of multiple elements in national standard food for food safety (GB5009.268-2016 (first method (ICP-MS)) standard, cadmium content and effective cadmium content in soil are detected according to the standard of aqua regia extraction-inductively coupled plasma mass spectrometry (HJ803-2016) for determination of 12 metal elements in soil and sediments, and organic matter content in soil is detected according to the standard of determination of organic matter in soil at the 6 th part of soil detection (NY/T1121.6-2006).
The effect of applying composition A on the cadmium content of rice (as shown in FIG. 1) can be seen from the graph: the Cd content of the rice grain produced in the soil without the composition A is 0.663 mg-kg in the first season and 0.663 mg-kg in the second season respectively -1 And 0.654mg kg -1 Exceeding 0.2 mg/kg specified in the food pollutant limit (GB 2762-2017) standard -1 (ii) a Compared with the control, the application of the composition A can obviously reduce the Cd content in rice grains, and the Cd content in the first-season rice and 3 treated grains is reduced to 0.137-0.250 mg-kg -1 The amplitude reduction is 62.29-79.33%; in the second season rice, the Cd content in 3 treated grains is reduced to 0.170-0.215 mg/kg -1 The amplitude reduction is 67.13% -74.00%; the influence of the application amount of the different composition A on the Cd content in rice grains is different, and the comprehensive consideration shows that when the application proportion is 2.5%, the reduction rate of the Cd content in the grains is 79.33%, and the passivation effect is the best.
Effect of application of composition a on rice and wheat yield: the application of the composition A has significant influence on the yields of rice and wheat, the rice yields in the first season of the treatment groups are 480.18 kg/mu, 482.67 kg/mu, 502.94 kg/mu and 514.89 kg/mu respectively at the addition ratios of 0, 1.0%, 2.5% and 3.0%, the yields of wheat are 400.4 kg/mu, 404.12 kg/mu, 412.52 kg/mu and 413.0 kg/mu respectively, and the organic matters in the soil are 3.30 g.kg -1 、3.46g·kg -1 、3.76g·kg -1 、4.32g·kg -1 Therefore, the addition of the composition A does not reduce the yield of rice and wheat and does not affect the soil fertilizerRather, it is beneficial to increase yield.
The effect of the composition A on the cadmium content in wheat (as shown in figure 2) is similar to the rice treatment effect, the Cd content in wheat grains can be effectively reduced by adding the composition A, and the Cd content in the wheat grains in 3 treatment groups is 1.87 mg-kg -1 Respectively reduced to 1.21 mg-kg -1 、0.93mg·kg -1 、1.05mg·kg -1 The reduction is 35.29%, 50.26% and 43.85%, respectively. After the composition A is applied before the first-season rice is planted, the inhibition effect on the absorption of heavy metal elements by the rice is achieved, the inhibition effect is continuous, and the content of the heavy metal elements in wheat grains produced in the next-year wheat season can be reduced under the condition that the composition A is not continuously applied.
The effect of applying the composition a on the content of cadmium in an available state in soil (as shown in fig. 3, fig. 3 shows the content of cadmium in an available state in soil after harvesting rice in the second season), as can be seen from fig. 3, the passivation coefficients of the treatment groups with the addition ratios of 1.0%, 2.5%, and 3.0% are respectively: 35.63%, 65.52%, 48.28%. After the composition A is added, the chemical form of heavy metal elements such as Cd in the soil is changed through a series of reactions such as precipitation, ion exchange adsorption and surface complexation of the composition A and the heavy metal cadmium in the soil, the content of effective cadmium ions which can be absorbed by plants is reduced, and the mobility and the biological activity of the cadmium ions are reduced, so that the content of Cd in crops is reduced. Meanwhile, the detection proves that the content of the effective cadmium in the soil is greatly reduced after the composition A is added in the whole repairing stage.
Example 2
(1) The preparation method of fermented conifer bark comprises: the preparation method of fermented conifer bark comprises: subjecting pine bark to first drying (at about 25 deg.C for a time sufficient to obtain a water content of 16%) and first pulverizing (under conditions such that the bark has a particle size of 30-60 mesh), fermenting at 45 deg.C and a humidity of 60%, and further subjecting to second drying (at about 50 deg.C for a time sufficient to obtain a water content of 8%) and second pulverizing (under conditions such that the bark has a particle size of 60-100 mesh).
(2) Clinoptilolite (60-100 meshes), polyaluminium ferric chloride (60-100 meshes), brucite (60-80 meshes) and the fermented conifer bark prepared in step (1) are independently crushed into 60-100 meshes, and then the mixture is mixed according to the ratio of 100: 10: 10: 5 to obtain a mixed composition B.
Application example 2
This application example illustrates the use of composition B prepared in example 2 for soil remediation
A field (mercury content of 3.0mg/kg) contaminated with mercury was developed in Jiangsu province as a test field, a test plan was set according to the area of a natural field, and a control group (ECK group) to which no composition B was applied and a treatment group (SLB group) to which 1000 kg/mu (i.e., 1% addition rate), 2000 kg/mu (i.e., 2% addition rate) and 3000 kg/mu (i.e., 3% addition rate) of the composition B prepared in example 2 were applied, respectively, were set. The field management follows the optimal and consistent principle, and besides different applications of the composition B, other fertilization measures, weeding measures and irrigation measures are consistent for each control group and each treatment group, and the production requirements are met.
The crop tested was wheat (Ningmai 13), wheat was grown: the test paddling area is provided with a control group and a treatment group, ploughing (ploughing by adopting a horizontal shaft type rotary cultivator with the ploughing depth of 20cm), applying a composition B, ploughing (ploughing by adopting a horizontal shaft type rotary cultivator with the ploughing depth of 20cm), planting wheat after maintenance, collecting soil samples and wheat samples of each group of plough layers after the wheat is mature, harvesting the wheat after sampling, and respectively testing the yield and accepting of each group.
The mercury content in the wheat grains is detected according to the standard of 'determination of total mercury and organic mercury in food safety national standard food' GB5009.17-2014 'the first method' by an atomic fluorescence spectrometry, and the mercury content and the effective mercury content in the soil are detected according to the standard of determination of the total mercury in the soil of the 1 st part of the soil by a soil quality atomic fluorescence method GB/T22105.1-2018.
The effect of the composition B on the mercury content in the wheat (as shown in figure 4) is exerted, and as can be seen from figure 4, the mercury content in the wheat can be reduced by adding the composition B, the mercury content in the wheat is respectively reduced from 0.1043mg/kg to 0.0663mg/kg, 0.0266mg/kg and 0.0195mg/kg by adding the composition B with the content of 3.0%, 2.0% and 1.0% in different adding proportions on the cadmium in the wheat, and the mercury content in the wheat is respectively reduced from 36.43%, 74.50% and 81.30%. The best effect is that the adding proportion is 3.0%, and the reducing amplitude can reach 81.30%.
The effect of applying composition B on the available mercury content in the soil (as shown in fig. 5), the addition of composition B significantly reduced the available mercury content in the soil compared to the control. The effect of reducing the mercury availability was better in the treatment group containing 3.0% of composition B than in the treatment groups containing 1.0% and 2.0% of composition B. The reduction rates of the mercury available state contents of the treatment groups, in which the amounts of the composition B added were 3.0%, 2.0%, and 1.0%, respectively, were 43.54%, 24.73%, and 11.54%, respectively, as compared with the control group.
Example 3
(1) The preparation method of fermented conifer bark comprises: the preparation method of fermented conifer bark comprises: pine bark was sequentially subjected to a first drying (at a temperature of about 25 ℃ C., for a time period such that the moisture content in the bark was 14%) and a first pulverization (under a condition of the first pulverization such that the particle size of conifer bark was 200-300 mesh), then to a fermentation under a temperature of 60 ℃ C. and a humidity of 70%, and then to a second drying (at a temperature of about 50 ℃ C., for a time period such that the moisture content in the bark was 8%) and a second pulverization (under a condition of the second pulverization such that the particle size of conifer bark was 60-100 mesh).
(2) Clinoptilolite (60-100 meshes), polyaluminium ferric chloride (60-100 meshes), brucite (60-80 meshes) and the fermented conifer bark prepared in step (1) are independently crushed into 60-100 meshes, and then the mixture is mixed according to the ratio of 100: 15: 15: 15 to obtain a mixed composition C.
Application example 3
This application example illustrates the use of composition C prepared in example 3 for soil remediation
A cadmium-polluted farmland experiment is carried out in a certain city of east China, a test scheme is set according to the area of a natural plot, four farmlands with different pollution concentrations are selected, and the cadmium content is 0.85mg/kg (region D), 0.32mg/kg (region C), 0.34mg/kg (region B) and 0.30mg/kg (region A) respectively. Dividing each region of four cultivated lands with different pollution concentrations into a control group (CK group) and a treatment group (SLC group), wherein the control group is not applied with the composition C, the treatment group is applied with 1000 kg/mu (namely, the addition proportion is 1 percent) of the composition C, the cultivated land management follows the most appropriate and consistent principle, and besides the application of the passivator, all other measures of fertilization, weeding and irrigation are consistent and meet the production requirements.
The tested crops are vegetables (cauliflower, Chinese cabbage and green vegetable), three kinds of vegetables are planted in each area, and a control group and a treatment group are respectively arranged.
Planting vegetables: preparing a test cultivated land, ploughing (adopting a horizontal shaft type rotary cultivator to plough, wherein the ploughing depth of the ploughing is 20cm), applying the composition C, planting (cauliflower, Chinese cabbage and green vegetable) in a greenhouse, and collecting soil samples and vegetable samples of various plough layers until a picking period.
Cadmium content in vegetables is detected according to the standard of determination of multiple elements in national food safety standards (GB5009.268-2016 'first method (ICP-MS)'), and cadmium content in soil and effective cadmium content are detected according to the standard of aqua regia extraction-inductively coupled plasma mass spectrometry (HJ803-2016) for determination of 12 metal elements in soil and sediments.
The effect of applying composition C on the cadmium content of the vegetables (as shown in FIG. 6), FIG. 6 shows the cadmium content of three vegetables planted in zone D with a cadmium content of 0.85 mg/kg. As can be seen from FIG. 6, the addition of 1.0% of composition C reduced the cadmium content in the vegetables; compared with a control group, after the 1.0 percent of the composition C is added, the cadmium content in the Chinese cabbage is reduced from 0.336mg/kg to 0.194mg/kg, and the reduction amplitude can reach 42.26 percent; the cadmium content in the cauliflower is reduced from 0.113mg/kg to 0.052mg/kg, and the reduction amplitude can reach 53.98 percent; the cadmium content in the green vegetables is reduced from 0.158mg/kg to 0.091mg/kg, and the reduction amplitude can reach 42.40 percent. By comparison, the composition C is more suitable for planting cauliflower.
The effect of applying composition C on the content of available cadmium in the soil (as shown in fig. 7), the addition of composition C significantly reduced the available cadmium content of the soil compared to the control. A. B, C, D areas are all added with 1.0 percent of composition C, wherein the effective cadmium in the soil of the area A is reduced from 0.055mg/kg to 0.041mg/kg, and the reduction amplitude is 25.45 percent; the effective cadmium in the soil in the area B is reduced from 0.054mg/kg to 0.038mg/kg, and the reduction range is 29.63 percent; the effective cadmium in the soil in the C area is reduced from 0.049mg/kg to 0.036mg/kg, and the reduction amplitude is 26.53 percent; the effective cadmium in the soil in the area D is reduced from 0.121mg/kg to 0.067mg/kg, and the reduction range is 44.62 percent. The addition of the composition C can reduce the effective state content of cadmium in the soil to a certain extent, and reduce the migration and transformation capacity of the cadmium, thereby reducing the enrichment of the cadmium to vegetables.
Comparative example 1
A composition was prepared according to the method of example 1 except that in step (1), pine bark was replaced with the bark of a general broad-leaved phoenix tree.
Comparative application example 1
This comparative example is intended to illustrate the use of composition D, prepared in comparative example 1, for soil remediation
Soil remediation was carried out in accordance with the method of application example 1, except that composition a was replaced with composition D prepared in comparative example 1.
The effect of applying composition D prepared in comparative example 1 on the cadmium content of wheat (as shown in fig. 8) can be seen from the graph: the application of the composition D can reduce the Cd content in the wheat grains, and in 3 treatment groups, the Cd content in the wheat grains is 1.87 mg-kg -1 Respectively reduced to 1.65 mg-kg -1 、1.45mg·kg -1 、1.66mg·kg -1 The reduction is 11.76%, 22.45% and 11.23%, respectively. Compared with the repairing effect in the application example 1, the repairing effect is greatly reduced after the corresponding fermentation material raw materials are replaced in the comparative example 1.
The influence of the composition D prepared in comparative example 1 on the content of cadmium in an available state in soil (as shown in fig. 9, and fig. 9 shows the content of cadmium in an available state in soil after harvesting rice in the second season) is applied, and as can be seen from fig. 9, the passivation coefficients of the treatment groups with the addition ratios of the composition D of 1.0%, 2.5% and 3.0% are respectively: 22.99%, 27.59%, 13.79%. Compared with the reduction rate of the content of the effective cadmium in the application example 1, after the corresponding fermentation material raw material is replaced in the comparative example 1, the reduction rate of the effective cadmium is greatly reduced, so that the repairing effect is far lower than that of the repairing material composition A in the application example 1.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including various technical features being combined in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The composition with the function of repairing heavy metal contaminated soil is characterized by comprising natural zeolite, polyaluminium ferric chloride, brucite and fermented conifer barks, wherein the weight ratio of the natural zeolite to the polyaluminium ferric chloride to the brucite to the fermented conifer barks is 100: 10-30: 5-20: 5-15.
2. The composition of claim 1, wherein the weight ratio of natural zeolite, polyaluminum ferric chloride, brucite, and after fermentation conifer bark is 100: 15-30: 15-20: 10-15.
3. The composition of claim 1, wherein the weight ratio of natural zeolite, polyaluminum ferric chloride, brucite, and after fermentation conifer bark is 100: 10-20: 10-20: 5-10.
4. The composition of any one of claims 1-3, wherein the natural zeolite is at least one of clinoptilolite, mordenite, and phillipsite;
and/or the coniferous bark is bark of at least one of pine, fir and palm.
5. The composition according to any one of claims 1-3, wherein the fermented conifer bark is prepared by a method comprising: sequentially performing first drying and first pulverizing on conifer bark, fermenting at 40-60 deg.C and humidity of 60-70%, and performing second drying and second pulverizing.
6. A composition according to any one of claims 1 to 3, wherein the particle size of the natural zeolite, polyaluminium ferric chloride, brucite and the fermented conifer bark are each independently in the range of 60-100 mesh.
7. Use of the composition according to any one of claims 1 to 6 for the remediation of heavy metal contaminated soil.
8. A method for remediating heavy metal contaminated soil, comprising the steps of: applying the composition of any one of claims 1-6 to the soil of an agricultural field followed by at least one turn-up; wherein the soil of the farmland is heavy metal contaminated soil.
9. The method of claim 8, wherein the heavy metal comprises at least one of cadmium, copper, zinc, lead, mercury, arsenic, and chromium;
and/or the content of the heavy metal in the heavy metal polluted soil is 0.3-3000 mg/kg.
10. The method as claimed in claim 8, wherein the composition is applied in an amount of 800-3000kg per acre of farmland.
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