CN113416551A - Heavy metal contaminated soil composite repairing agent produced by using agricultural and sewage transport and maintenance wastes and preparation method thereof - Google Patents
Heavy metal contaminated soil composite repairing agent produced by using agricultural and sewage transport and maintenance wastes and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of harmless treatment and utilization of agricultural wastes, and particularly relates to a heavy metal contaminated soil composite repairing agent produced by using agricultural and sewage transportation and maintenance wastes and a preparation method thereof. The invention provides a heavy metal contaminated soil composite repairing agent and a preparation method thereof, aiming at the problem of high treatment cost of a treatment method in the prior art, wherein the heavy metal contaminated soil composite repairing agent comprises 40-50 parts of domestic sludge, 30-40 parts of crop wastes and 20-30 parts of modified fly ash in parts by mass. The main components of the invention are all from waste, the raw materials are easy to obtain, the cost is low, meanwhile, the invention can realize the secondary utilization of the waste, and no secondary pollution is generated.
Description
Technical Field
The invention belongs to the technical field of harmless treatment and utilization of agricultural and agricultural operation and maintenance wastes and polluted soil remediation, and particularly relates to a heavy metal polluted soil composite remediation agent produced by using the agricultural and agricultural operation and maintenance wastes and a preparation method thereof.
Background
With the rapid development of new rural construction in China, the daily water consumption and discharge amount per capita in rural areas are increased rapidly. According to statistics, 96% of villages in China do not have drainage channels and sewage treatment systems, domestic sewage is discharged at will, the sewage can destroy the water environment, and the drinking water safety of vast rural areas is threatened. In addition, a large amount of production wastes (biomass fuels) such as straws and waste wood exist in rural areas, and the recycling rate of the biomass fuels is low, so that agricultural non-point source pollution is caused, and the ecological environment of rural areas is seriously influenced. How to effectively treat and utilize agricultural wastes is a great problem in the rural ecological management of China.
On the other hand, soil is the most important natural resource in human production and life, and with the rapid development of human socioeconomic, a large amount of discharged industrial pollutants are migrated into the soil through atmospheric sedimentation, a large amount of heavy metals formed by the accumulation of a large amount of solid wastes generated by industrial activities are percolated into the soil, and unreasonable agricultural measures (such as sewage irrigation) jointly cause the heavy metal pollution of the soil to be increasingly serious, which indirectly brings serious threat to the life health of human beings. The heavy metal pollution of soil means that certain heavy metals are excessively enriched in soil and exceed the bearing capacity of the soil, so that the heavy metals have toxic action on the quality of crops and plants and underground water, and free heavy metals in the polluted soil can migrate into water and atmosphere on the one hand, so that the pollution range of the polluted soil is further enlarged, and on the other hand, the heavy metals can enter human bodies along the soil-crops-human systems through the biological enrichment action, so that the human bodies are directly harmed, for example, chromium (hexavalent) can cause respiratory diseases, lung cancer is caused, and lead can affect the central nervous system of human bodies, so that lead poisoning is caused. The common heavy metals in soil include cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), zinc (Zn), metalloid arsenic (As) and the like, and the heavy metal pollution in soil is often the combined pollution of coexistence of 2 or more than 2 kinds of heavy metals. Compared with single pollution, the interaction exists between elements or compounds in heavy metal composite pollution, the toxicity of the heavy metal composite pollution is further enhanced, and the heavy metal composite pollution is difficult to absorb, degrade and convert in soil. Therefore, the heavy metal pollution of the soil has the characteristics of great harm, strong concealment, no leaching and the like, and the characteristics also make the remediation of the soil polluted by the heavy metal extremely challenging.
The existing heavy metal contaminated soil remediation technologies mainly comprise physical, chemical, biological remediation and other technologies, wherein the physical remediation technologies comprise an isolation embedding method and a pyrometallurgical separation method, the chemical remediation technologies comprise a chemical immobilization and stabilization method and a chemical reduction method, and the biological remediation technologies comprise a microbial remediation method and a plant remediation method, but the existing methods all have the problem of high treatment cost.
In view of the above problems, a great deal of research and study has been conducted in long-term production and living practices, such as: the Chinese patent with the patent application number of 201710117728.6 and the name of chemical stabilizer and method for repairing heavy metal contaminated soil discloses a chemical stabilizer and a method for repairing heavy metal contaminated soil, wherein the chemical stabilizer for repairing heavy metal contaminated soil comprises a solid conditioner and a liquid stabilizer, and the solid conditioner comprises the following components in parts by weight: 40-55 parts of fly ash, 20-35 parts of phosphogypsum and 15-30 parts of red mud; the liquid stabilizer is a zero-valent nano iron mixed suspension with rhamnolipid dispersed. The method for restoring the heavy metal contaminated soil comprises the following steps: (1) applying a solid conditioner on the surface of the heavy metal contaminated soil for conditioning; (2) and spraying a liquid stabilizer to reduce the heavy metals in the polluted soil. Although the method for repairing the heavy metal contaminated soil has the advantages of low repairing cost and good repairing effect, the method still has the defects of complex repairing process, complex operation and easy generation of secondary pollution.
Disclosure of Invention
The invention aims to solve the problems and provides a composite repairing agent for heavy metal contaminated soil, which is prepared from agricultural and sewage transportation and maintenance wastes, and has the advantages of readily available raw materials and low cost.
The invention also aims to solve the problems and provides a preparation method for producing the heavy metal contaminated soil composite repairing agent by using the agricultural and sewage operation and maintenance wastes.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite repairing agent for heavy metal contaminated soil produced by using agricultural and agricultural wastes comprises, by mass, 40-50 parts of domestic sludge, 30-40 parts of crop wastes and 20-30 parts of modified fly ash.
In the method for producing the composite repairing agent for the heavy metal contaminated soil by utilizing the agricultural and sewage transport and maintenance waste, the composite repairing agent for the heavy metal contaminated soil comprises 45 parts of domestic sludge, 35 parts of crop waste and 25 parts of modified fly ash in parts by mass.
In the method for producing the heavy metal contaminated soil composite repairing agent by using the agricultural and agricultural wastes, the agricultural wastes comprise one or more of rice straws, corn straws, soybean straws and sorghum straws.
In the method for producing the composite repairing agent for the heavy metal polluted soil by utilizing the agricultural and sewage transport and maintenance waste, the modified fly ash is alkali modified fly ash which takes sodium hydroxide as alkali liquor.
The preparation method for producing the heavy metal contaminated soil composite repairing agent by using the agricultural and sewage operation and maintenance wastes is characterized by comprising the following steps of:
the method comprises the following steps: dewatering sludge, namely mechanically dewatering the domestic sludge to obtain dewatered sludge with the water content of 60-80%;
step two: preparing auxiliary materials, collecting crop wastes and crushing for later use;
step three: mixing the dewatered sludge and the crushed crop wastes, performing room-temperature aerobic composting for 12-18 days, and performing anaerobic composting fermentation for 40-50 days to obtain an organic material;
step four: preparing modified fly ash, collecting fly ash produced by a thermal power plant, mixing the fly ash with a sodium hydroxide solution in proportion, putting the mixture into a three-neck flask, stirring the mixture at an internal temperature, taking out the fly ash, and drying the fly ash to finally obtain the modified fly ash;
step five: and (3) preparing a composite repairing agent, namely mixing the organic material prepared in the third step with the modified fly ash prepared in the fourth step, and uniformly stirring to obtain the final heavy metal contaminated soil composite repairing agent.
In the preparation method for producing the composite repairing agent for the heavy metal polluted soil by utilizing the agricultural and sewage operation and maintenance wastes, the mechanical dehydration in the first step adopts the plate-and-frame filter pressing system for dehydration.
In the preparation method for producing the heavy metal polluted soil composite repairing agent by utilizing the agricultural and agricultural operation and maintenance wastes, the grain diameter of the crushed agricultural and agricultural wastes in the step two is 2mm-3 mm.
In the preparation method for producing the heavy metal contaminated soil composite repairing agent by using the agricultural and sewage transport and maintenance waste, the particle size of the fly ash in the fourth step is 0.03mm-0.05 mm.
In the preparation method for producing the heavy metal contaminated soil composite repairing agent by using the agricultural and sewage transport and maintenance waste, the solute mass fraction of the sodium hydroxide solution in the fourth step is 30%.
In the preparation method for producing the heavy metal contaminated soil composite repairing agent by using the agricultural and sewage transport and maintenance waste, the mixing ratio of the fly ash and the sodium hydroxide solution in the fourth step is 1:30 by mass.
Compared with the prior art, the invention has the advantages that:
1. the main components of the invention are all from waste, the raw materials are easy to obtain, the cost is low, meanwhile, the invention can realize the secondary utilization of the waste, and no secondary pollution is generated.
2. The mixed compost of the invention is rich in high molecular aromatic polymers with complex structures, such as humic acid, humic acid and the like, and is rich in-COOH, -OH, -C-O and-NH2The active groups can perform complexation and chelation reactions with heavy metals in the soil, for example, humic acid can perform complexation reactions with heavy metals with valences of 2 and 3 in the soil to form insoluble salts, so that the content of heavy metals in a water-soluble state and an exchange state in the soil can be reduced; the organic material can also be used as reducing agent to promote cadmium (Cr) in soil6+) Cadmium sulfide precipitate (Cr) is formed2+) So that the biological activity of the cadmium is greatly reduced.
3. The fly ash disclosed by the invention is subjected to alkali modification, has a large specific surface area and strong physical adsorption and flocculation precipitation capabilities, can reduce the heavy metal mobility and the biological effectiveness in soil through adsorption, coprecipitation and complexation of heavy metals, contains a large number of carboxyl, hydroxyl oxygen-containing functional groups and three-dimensional crystal structures in the alkali-modified fly ash, also has strong ion exchange capability, can combine the heavy metals in the soil with layered silicate through ion exchange adsorption and special adsorption, so that the content of the heavy metals in the soil is reduced, and the pH value of the soil can be increased by adding the alkali-modified fly ash into the soil, so that the adsorption effect of the remediation agent on the heavy metals in the soil is further enhanced.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1
The embodiment provides a composite repairing agent for heavy metal contaminated soil produced by utilizing agricultural and agricultural operation and maintenance wastes, which comprises 40 parts of domestic sludge, 40 parts of crop wastes and 30 parts of modified fly ash in parts by mass. Wherein the crop waste is rice straw, and the modified fly ash is alkali modified fly ash which takes 30% sodium hydroxide as alkali liquor.
Fly ash, a process waste left after combustion of coal in a boiler used in thermal power plants, comprises as a main component a dioxygen compoundSilicon (SiO)2) Titanium dioxide (TiO)2) Aluminum oxide (Al)2O3) Iron oxide (Fe)2O3) Calcium oxide (CaO), and the like.
Example 2
The embodiment provides a composite repairing agent for heavy metal contaminated soil produced by utilizing agricultural and agricultural operation and maintenance wastes, which comprises 50 parts of domestic sludge, 30 parts of crop wastes and 20 parts of modified fly ash in parts by mass. Wherein the crop waste is corn straw and soybean straw which are mixed in equal mass, and the modified fly ash is alkali modified fly ash which takes 30% sodium hydroxide as alkali liquor.
Example 3
The embodiment provides a composite repairing agent for heavy metal contaminated soil produced by utilizing agricultural and agricultural operation and maintenance wastes, which comprises 45 parts of domestic sludge, 35 parts of crop wastes and 25 parts of modified fly ash in parts by mass. Wherein the crop waste is sorghum straws, and the modified fly ash is alkali modified fly ash which takes 30% sodium hydroxide as alkali liquor.
Example 4
The embodiment provides a preparation method for producing a heavy metal contaminated soil composite repairing agent by using agricultural and agricultural operation and maintenance wastes, which comprises the following steps:
the method comprises the following steps: dehydrating sludge, namely dehydrating the sludge by using a plate-and-frame filter pressing system after obtaining domestic sludge to obtain dehydrated sludge with the water content of 60%;
step two: preparing auxiliary materials, collecting crop wastes and crushing for later use, wherein the particle size of the crushed wastes is 2-3 mm;
step three: mixing the dewatered sludge and the crushed crop wastes, performing room-temperature aerobic composting for 12 days, and performing anaerobic composting fermentation for 40 days to obtain an organic material;
step four: preparing modified fly ash, collecting fly ash produced by a thermal power plant, wherein the particle size of the fly ash is 0.03-0.05 mm, mixing the fly ash with a 30% sodium hydroxide solution by mass percent, wherein the mixing ratio of the fly ash to the sodium hydroxide solution is 1:30, placing the mixture into a three-neck flask, carrying out warm stirring, taking out the fly ash, and drying to finally obtain the modified fly ash;
step five: and (3) preparing a composite repairing agent, namely mixing the organic material prepared in the third step with the modified fly ash prepared in the fourth step, and uniformly stirring to obtain the final heavy metal contaminated soil composite repairing agent.
Example 5
The embodiment provides a preparation method for producing a heavy metal contaminated soil composite repairing agent by using agricultural and agricultural operation and maintenance wastes, which comprises the following steps:
the method comprises the following steps: dehydrating sludge, namely dehydrating the sludge by using a plate-and-frame filter pressing system after obtaining domestic sludge to obtain dehydrated sludge with the water content of 80%;
step two: preparing auxiliary materials, collecting crop wastes and crushing for later use, wherein the particle size of the crushed wastes is 2-3 mm;
step three: mixing the dewatered sludge and the crushed crop wastes, performing room-temperature aerobic composting for 18 days, and performing anaerobic composting fermentation for 50 days to obtain an organic material;
step four: preparing modified fly ash, collecting fly ash produced by a thermal power plant, wherein the particle size of the fly ash is 0.03-0.05 mm, mixing the fly ash with a 30% sodium hydroxide solution by mass percent, wherein the mixing ratio of the fly ash to the sodium hydroxide solution is 1:30, placing the mixture into a three-neck flask, carrying out warm stirring, taking out the fly ash, and drying to finally obtain the modified fly ash;
step five: and (3) preparing a composite repairing agent, namely mixing the organic material prepared in the third step with the modified fly ash prepared in the fourth step, and uniformly stirring to obtain the final heavy metal contaminated soil composite repairing agent.
Example 6
The embodiment provides a preparation method for producing a heavy metal contaminated soil composite repairing agent by using agricultural and agricultural operation and maintenance wastes, which comprises the following steps:
the method comprises the following steps: dehydrating sludge, namely dehydrating the sludge by using a plate-and-frame filter pressing system after obtaining domestic sludge to obtain dehydrated sludge with the water content of 70%;
step two: preparing auxiliary materials, collecting crop wastes and crushing for later use, wherein the particle size of the crushed wastes is 2-3 mm;
step three: mixing the dewatered sludge and the crushed crop wastes, performing aerobic composting for 15 days at room temperature after proportioning, and performing anaerobic composting fermentation for 45 days to obtain an organic material;
step four: preparing modified fly ash, collecting fly ash produced by a thermal power plant, wherein the particle size of the fly ash is 0.03-0.05 mm, mixing the fly ash with a 30% sodium hydroxide solution by mass percent, wherein the mixing ratio of the fly ash to the sodium hydroxide solution is 1:30, placing the mixture into a three-neck flask, carrying out warm stirring, taking out the fly ash, and drying to finally obtain the modified fly ash;
step five: and (3) preparing a composite repairing agent, namely mixing the organic material prepared in the third step with the modified fly ash prepared in the fourth step, and uniformly stirring to obtain the final heavy metal contaminated soil composite repairing agent.
Comparative example 1
The comparative example provides a heavy metal contaminated soil composite repairing agent which comprises, by mass, 45 parts of domestic sludge, 35 parts of crop wastes and 25 parts of fly ash. Wherein the crop waste is sorghum straw.
Comparative example 2
The comparative example provides a heavy metal contaminated soil composite repairing agent which comprises 45 parts of domestic sludge, 35 parts of crop wastes and 25 parts of modified fly ash in parts by mass. Wherein the crop waste is sorghum straws, and the modified fly ash is alkali modified fly ash which takes 20% sodium hydroxide as alkali liquor.
Comparative example 3
The embodiment provides a preparation method of a heavy metal contaminated soil composite repairing agent, which comprises the following steps:
the method comprises the following steps: dehydrating sludge, namely dehydrating the sludge by using a plate-and-frame filter pressing system after obtaining domestic sludge to obtain dehydrated sludge with the water content of 70%;
step two: preparing auxiliary materials, collecting crop wastes and crushing for later use, wherein the particle size of the crushed wastes is 2-3 mm;
step three: mixing the dewatered sludge and the crushed crop wastes, performing aerobic composting for 15 days at room temperature after proportioning, and performing anaerobic composting fermentation for 45 days to obtain an organic material;
step four: preparing fly ash, and collecting the fly ash produced by a thermal power plant, wherein the particle size of the fly ash is 0.03-0.05 mm;
step five: and (3) preparing a composite repairing agent, namely mixing the organic material prepared in the third step with the fly ash prepared in the fourth step, and uniformly stirring to obtain the final heavy metal contaminated soil composite repairing agent.
Comparative example 4
The embodiment provides a preparation method of a heavy metal contaminated soil composite repairing agent, which comprises the following steps:
the method comprises the following steps: dehydrating sludge, namely dehydrating the sludge by using a plate-and-frame filter pressing system after obtaining domestic sludge to obtain dehydrated sludge with the water content of 70%;
step two: preparing auxiliary materials, collecting crop wastes and crushing for later use, wherein the particle size of the crushed wastes is 2-3 mm;
step three: mixing the dewatered sludge and the crushed crop wastes, performing aerobic composting for 15 days at room temperature after proportioning, and performing anaerobic composting fermentation for 45 days to obtain an organic material;
step four: preparing modified fly ash, collecting fly ash produced by a thermal power plant, wherein the particle size of the fly ash is 0.03-0.05 mm, mixing the fly ash with a sodium hydroxide solution with the mass fraction of 20%, wherein the mixing ratio of the fly ash to the sodium hydroxide solution is 1:30, putting the mixture into a three-neck flask, carrying out warm stirring, taking out the fly ash, and drying to finally obtain the modified fly ash;
step five: and (3) preparing a composite repairing agent, namely mixing the organic material prepared in the third step with the modified fly ash prepared in the fourth step, and uniformly stirring to obtain the final heavy metal contaminated soil composite repairing agent.
Application example 1
The application example determines and compares the heavy metal content of the polluted soil and the heavy metal content of the control group. Selecting agricultural greenhouse facilities with the service life of 8-10 years,respectively collecting vegetable field soil and adjacent soil surface layer soil (0-30 cm) in the greenhouse facility. Taking a plurality of soil samples of two lands by adopting a multipoint sampling method, then naturally drying, grinding, sieving by a 60-mesh sieve, weighing 0.1000g of sample, adding HNO3-H2O2And (5) soaking in HCl, digesting by using a microwave digestion instrument, and obtaining a solution to be tested after digestion. Weighing 5.00g of soil, adding an extraction agent of diethyltriaminepentaacetic acid (DTPA), leaching, filtering to obtain a solution to be detected, and finally determining the total amount of Pb, Cd, Cu and Zn in the two pieces of soil by using an inductively coupled plasma mass spectrometer.
And (4) analyzing results: as can be seen from the above table, the heavy metal pollution of the soil cultivated for many years is increasingly serious due to unreasonable agricultural measures.
Application example 2
A repairing agent 1 was prepared by the method described in example 6 with the components described in example 3;
a repairing agent 2 was prepared by the method described in comparative example 3 with the components described in comparative example 1;
a repairing agent 3 was prepared by the method described in comparative example 4 with the components described in comparative example 2;
the contaminated soil in the application example 1 is used as a soil sample to be restored, air-dried and crushed, sieved by a 10-mesh sieve, and uniformly mixed to be used as the soil to be restored for later use. The soil to be restored is equally divided into three parts, and the three parts are paved on three experimental lands with equal areas and are respectively named as a test field A, a test field B and a test field C. 1kg of repairing agent 1, 1kg of repairing agent 2 and 1kg of repairing agent 3 are respectively sprayed in a test field A, a test field B and a test field C, and then the following two experiments are respectively carried out:
test 1: and fully and uniformly mixing the treated soil composite repairing agent and the soil to be repaired, and then filling the mixture into plastic basins with the capacity of 5L, namely an A plastic basin, a B plastic basin and a C plastic basin. Spraying a small amount of water, standing for 1 week, transplanting 6 rape seedlings with the same growth vigor and similar biomass, which are bred in advance, into each plastic pot, then normally managing, harvesting edible parts of the rapes after 30 days, and carrying out laboratory treatment for later use.
Test 2: the main difference from the test 1 is that no plant is planted in the plastic pot, the rest treatment is the same as the test 1, meanwhile, soil is taken out when the small rape is harvested in the test 1, the laboratory treatment is carried out, DTPA is used as an extracting agent, the extracting method is the same as the application example 1, and the effective heavy metal in the soil is extracted for standby test.
The heavy metal content in the plant body and the soil available heavy metal content are both determined by using an atomic absorption spectrophotometry, and the results of experiment 1 are shown in the following table:
| experimental group | Cd | Pb |
| Plastic basin | 0.018 | 1.39 |
| Second plastic basin | 0.030 | 1.62 |
| Third plastic basin | 0.024 | 1.42 |
The results of experiment 2 are shown in the following table:
| experimental group | Pb | Cd | Zn | Cu |
| Plastic basin | 1.32 | 0.17 | 3.58 | 2.09 |
| Second plastic basin | 1.66 | 0.19 | 4.16 | 2.82 |
| Third plastic basin | 1.35 | 0.17 | 3.82 | 2.18 |
And (4) analyzing results: as can be seen from the above table, the repairing agent 1 has the best repairing effect, and thus the intended purpose of the present invention is achieved.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The method for producing the heavy metal contaminated soil composite repairing agent by using the agricultural and sewage operation and maintenance wastes is characterized by comprising the following steps: comprises 40-50 parts of domestic sludge, 30-40 parts of crop wastes and 20-30 parts of modified fly ash by weight.
2. The method for producing the composite repairing agent for the heavy metal contaminated soil by using the agricultural and agricultural operation and maintenance wastes as claimed in claim 1, wherein the method comprises the following steps: the heavy metal contaminated soil composite repairing agent comprises 45 parts of domestic sludge, 35 parts of crop wastes and 25 parts of modified fly ash in parts by weight.
3. The method for producing the composite repairing agent for the heavy metal contaminated soil by using the agricultural and agricultural operation and maintenance wastes as claimed in claim 1, wherein the method comprises the following steps: the crop waste comprises one or more of rice straw, corn straw, soybean straw and sorghum straw.
4. The method for producing the composite repairing agent for the heavy metal contaminated soil by using the agricultural and agricultural operation and maintenance wastes as claimed in claim 1, wherein the method comprises the following steps: the modified fly ash is alkali modified fly ash which takes sodium hydroxide as alkali liquor.
5. The preparation method for producing the composite repairing agent for the heavy metal contaminated soil by using the agricultural and agricultural operation and maintenance wastes as claimed in any one of claims 1 to 4 is characterized by comprising the following steps:
the method comprises the following steps: dewatering sludge, namely mechanically dewatering the domestic sludge to obtain dewatered sludge with the water content of 60-80%;
step two: preparing auxiliary materials, collecting crop wastes and crushing for later use;
step three: mixing the dewatered sludge and the crushed crop wastes, performing room-temperature aerobic composting for 12-18 days, and performing anaerobic composting fermentation for 40-50 days to obtain an organic material;
step four: preparing modified fly ash, collecting fly ash produced by a thermal power plant, mixing the fly ash with a sodium hydroxide solution in proportion, putting the mixture into a three-neck flask, stirring the mixture at an internal temperature, taking out the fly ash, and drying the fly ash to finally obtain the modified fly ash;
step five: and (3) preparing a composite repairing agent, namely mixing the organic material prepared in the third step with the modified fly ash prepared in the fourth step, and uniformly stirring to obtain the final heavy metal contaminated soil composite repairing agent.
6. The method for preparing the composite repairing agent for the soil polluted by the heavy metal by utilizing the agricultural and agricultural operation and maintenance wastes as claimed in claim 5, wherein the method comprises the following steps: and the mechanical dehydration in the step one adopts plate and frame filter pressing system dehydration.
7. The method for preparing the composite repairing agent for the soil polluted by the heavy metal by utilizing the agricultural and agricultural operation and maintenance wastes as claimed in claim 5, wherein the method comprises the following steps: in the second step, the grain diameter of the crushed crop wastes is 2mm-3 mm.
8. The method for preparing the composite repairing agent for the soil polluted by the heavy metal by utilizing the agricultural and agricultural operation and maintenance wastes as claimed in claim 5, wherein the method comprises the following steps: in the fourth step, the grain diameter of the fly ash is 0.03mm-0.05 mm.
9. The method for preparing the composite repairing agent for the soil polluted by the heavy metal by utilizing the agricultural and agricultural operation and maintenance wastes as claimed in claim 5, wherein the method comprises the following steps: in the fourth step, the solute mass fraction of the sodium hydroxide solution is 30 percent.
10. The method for preparing the composite repairing agent for the soil polluted by the heavy metal by utilizing the agricultural and agricultural operation and maintenance wastes as claimed in claim 5, wherein the method comprises the following steps: and step four, mixing the fly ash and the sodium hydroxide solution according to the mass ratio of 1: 30.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115746859A (en) * | 2022-09-09 | 2023-03-07 | 浙江慧丰环保科技有限公司 | Mercury-contaminated soil remediation curing agent, and preparation method and application thereof |
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