CN115417731A - Preparation method of thallium-polluted soil remediation fertilizer, product and application thereof - Google Patents
Preparation method of thallium-polluted soil remediation fertilizer, product and application thereof Download PDFInfo
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- CN115417731A CN115417731A CN202210985095.1A CN202210985095A CN115417731A CN 115417731 A CN115417731 A CN 115417731A CN 202210985095 A CN202210985095 A CN 202210985095A CN 115417731 A CN115417731 A CN 115417731A
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- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention discloses a preparation method of a thallium-polluted soil remediation fertilizer, which comprises the following steps: (1) Dissolving ferric sulfate and potassium permanganate in water to obtain ferromanganese solution; (2) Weighing sodium hydroxide solid, and dissolving the sodium hydroxide solid in water to obtain a sodium hydroxide solution; (3) Mixing and stirring the activated carbon powder and the ferromanganese solution to obtain ferromanganese carbon slurry; (4) Uniformly stirring the ferromanganese carbon slurry and a sodium hydroxide solution, drying and grinding to obtain ferromanganese carbon powder; (5) Mixing plant ash, zeolite powder and ferromanganese carbon powder uniformly. The invention also discloses a fertilizer prepared by using the method and application thereof. The thallium-polluted soil remediation fertilizer is simple in preparation method, easy in raw material obtaining and strong in practicability; the thallium-contaminated soil thallium leaching agent has the advantages of quick effect taking and obvious effect, can effectively reduce thallium-contaminated soil thallium leaching concentration after being used for several days, and can also effectively maintain soil tiltability and fertility.
Description
Technical Field
The invention belongs to the field of preparation of heavy metal contaminated soil remediation agents, and particularly relates to a preparation method of a thallium contaminated soil remediation fertilizer, and a product and application thereof.
Background
Thallium is widely used in the fields of communication, war industry, aerospace and the like. Thallium is a highly toxic heavy metal element, has far more harm to the health of human bodies than other heavy metal elements, even has more toxicity than arsenic, and has stronger environmental mobility and biological enrichment. Thallium has an atomic number of 81 and is located in IIIA group of the periodic table, so that naturally dispersed thallium has little harm to human beings and ecological environment and is difficult to form enrichment effect. The disordered mining and the improper management of tailings of thallium-containing ore deposits are main reasons for thallium pollution of soil in mining areas, and meanwhile, the deliberate discharge of thallium-containing industrial wastewater, the mining and combustion of thallium-containing coal mines, the transitional use of thallium-containing fertilizers and the like are also important reasons for serious thallium pollution of soil (including construction sites and agricultural sites).
Once the thallium pollutant enters the soil environment, the thallium pollutant can permeate into deep soil through ion exchange and ion migration, so that not only can groundwater pollution be caused, but also vegetation can be endangered, and the human health is further harmed through food chain enrichment. The effects of thallium contamination are persistent and difficult to remove in a short time by natural transformation or alternate vegetation growth.
At present, thallium-polluted soil remediation methods comprise a leaching method, a soil dressing dilution method, a chemical stabilization method and an electric driving method. Although the leaching method, the chemical stabilization method and the electric driving method can reduce thallium pollution toxicity to a certain extent and realize thallium reduction, the use of the chemical leaching agent and the chemical stabilizer can seriously damage the original components of soil and reduce the tiltability of the soil.
Disclosure of Invention
The purpose of the invention is as follows: the first purpose of the invention is to provide a thallium-polluted soil remediation fertilizer, which can realize thallium-polluted removal and simultaneously maintain or improve the fertility of soil.
The second purpose of the invention is to provide a preparation method of the thallium-contaminated soil remediation fertilizer.
The third purpose of the invention is to provide the application of the thallium-polluted soil remediation fertilizer in the aspect of thallium-polluted soil remediation.
The technical scheme is as follows: in order to achieve the aim, the invention provides a preparation method of a thallium-contaminated soil remediation fertilizer, which comprises the following steps:
(1) Dissolving ferric sulfate and potassium permanganate in water, and stirring until the ferric sulfate and the potassium permanganate are completely dissolved to obtain a ferromanganese solution;
(2) Dissolving sodium hydroxide solid in water, and stirring until the sodium hydroxide is completely dissolved to obtain a sodium hydroxide solution;
(3) Mixing and stirring activated carbon powder and the ferromanganese solution in the step (1) to obtain ferromanganese carbon slurry;
(4) Uniformly stirring the ferromanganese carbon slurry obtained in the step (3) and the sodium hydroxide solution obtained in the step (2), drying and grinding to obtain ferromanganese carbon powder;
(5) And (4) uniformly mixing the plant ash, the zeolite powder and the ferromanganese carbon powder in the step (4) to obtain the catalyst.
Preferably, in the step (1), the molar ratio of the ferric sulfate to the potassium permanganate is 0.5-9: 1.
preferably, the molar ratio of the sodium hydroxide solid in the step (2) to the ferric sulfate in the step (1) is 3-6: 1.
preferably, the mass ratio of the activated carbon in the step (3) to the potassium permanganate in the step (1) is 25-650: 1.
preferably, the mass ratio of the plant ash, the zeolite powder and the ferromanganese carbon powder in the step (5) is 2.5-47.5: 7.5-60: 100.
the invention also discloses the thallium-polluted soil remediation fertilizer prepared by the preparation method.
The invention also comprises the application of the thallium-polluted soil remediation fertilizer in soil remediation, wherein the application comprises the steps of mixing the thallium-polluted soil remediation fertilizer with thallium-polluted soil, uniformly stirring, uniformly spraying water, aging and standing.
Preferably, the mass ratio of the thallium-polluted soil remediation fertilizer to the thallium-polluted soil is 2.5-27.5: 100.
the reaction mechanism of the invention is as follows:
in the process of mixing the activated carbon powder and the ferromanganese solution, permanganate acid radicals and iron ions react with undecomposed oily substances and simple substance carbon in the activated carbon powder to generate manganese oxide, iron-manganese oxide and hydrocarbon. And mixing the ferromanganese carbon slurry with a sodium hydroxide solution, wherein hydroxide ions in the sodium hydroxide solution react with manganese oxide, iron-manganese oxide and hydrocarbon in the ferromanganese carbon slurry to generate a blend of carbon-supported iron-manganese oxide and hydroxide. Mixing plant ash, zeolite powder and ferromanganese carbon powder, stirring uniformly, and after thallium-contaminated soil is stirred, realizing selective adsorption, efficient oxidation and effective fixation of thallium pollutants in thallium-contaminated soil pores under the synergistic action of the plant ash, the zeolite powder and the ferromanganese carbon powder, thereby realizing effective remediation of the thallium-contaminated soil.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the preparation method has the advantages that the raw materials are easy to obtain; (2) The thallium-polluted soil remediation fertilizer has strong practicability, and can be used for remediating thallium-polluted soil after being stirred with the soil without other operations; (3) The thallium-polluted soil thallium leaching agent has quick effect and obvious effect, can effectively reduce the thallium-polluted soil thallium leaching concentration within a few days, and has the minimum leaching concentration of only 0.063 mug/L; (4) The tiltability and fertility of the soil can be effectively maintained, and the relative root growth ratio of the rice root system in the soil after soil remediation can reach 128 percent at most.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Preparing thallium-contaminated soil: weighing 1kg of uncontaminated soil sample, then adding 10mg of thallium into the soil sample, adding 1ml of water into every 1mg of soil, stirring uniformly, aging for 24 hours, and naturally air-drying.
Example 1 influence of molar ratio of ferric sulfate and potassium permanganate on performance of thallium-contaminated soil remediation fertilizer
1. Formulated thallium-polluted soil remediation fertilizer
(1) According to a molar ratio of 0.5: 1. 1: 1. 1.5: 1. 2: 1. 4: 1. 6:1. 7: 1. 8: 1. 9:1 ferric sulfate and potassium permanganate are respectively weighed and dissolved in water, and the mixture is stirred until the ferric sulfate and the potassium permanganate are completely dissolved to prepare nine groups of ferromanganese solutions.
(2) According to the molar ratio of sodium hydroxide to ferric sulfate of 3:1, weighing sodium hydroxide, dissolving the sodium hydroxide in water, and stirring the solution until the sodium hydroxide is completely dissolved to prepare a sodium hydroxide solution.
(3) According to the mass ratio of the activated carbon powder to the potassium permanganate of 50:1 weighing activated carbon powder. Respectively mixing the activated carbon powder with nine groups of ferromanganese solutions, and stirring for 0.5 hour to obtain nine groups of ferromanganese carbon slurries.
(4) And respectively mixing the nine groups of ferromanganese carbon slurry with a sodium hydroxide solution, stirring for 0.5 hour, drying and grinding to obtain nine groups of ferromanganese carbon powder.
(5) According to the mass ratio of 5:15:100, weighing the plant ash, the zeolite powder and the ferromanganese carbon powder respectively, and uniformly stirring to obtain nine groups of thallium-polluted soil remediation fertilizers.
2. Thallium contaminated soil remediation
According to the mass ratio of 5:100, respectively mixing the prepared nine groups of thallium-polluted soil remediation fertilizers with the thallium-polluted soil, uniformly stirring, uniformly spraying water, aging and standing for 7 days to obtain nine groups of repaired thallium-polluted soil.
3. Toxicity Leaching test
Toxicity leaching tests were performed on thallium-contaminated soil and soil samples after remediation respectively according to the solid waste leaching toxicity leaching method sulfuric acid-nitric acid method (HJ/T299-2007).
4. Thallium ion concentration detection
And respectively measuring the thallium concentration in the thallium-polluted soil and the thallium concentration in the soil sample leachate after remediation by graphite furnace atomic absorption spectrophotometry (HJ 748-2015).
5. Detection of root growth of soil-remediating plants
Rice is selected as the test plant, and the experiment of the root growth of rice in detoxified Soil and the experiment of the root growth of rice in uncontaminated Soil (blank control) are performed according to the international standard "Soil quality-Determination of the effects of pollutants on Soil flora-Part 1: method for the measurement of inhibition of root growth (ISO 11269-1-2012). According to the detection result, calculating the growth ratio of the rice relative to the root system according to the following formula:
relative rice root growth ratio = rice plant root growth length in detoxified soil/rice plant root growth length in uncontaminated soil.
6. Results of the experiment
TABLE 1 influence of molarity of ferric sulfate and potassium permanganate on performance of thallium contaminated soil remediation fertilizer
As can be seen from table 1, when the molar ratio of iron sulfate to potassium permanganate is less than 2:1 (serial numbers 1, 2 and 3 in table 1), the iron sulfate doping amount is small, the potassium permanganate doping amount is excessive, and the generation amount of the mixture of the iron manganese oxide, the carbon-supported iron manganese oxide and the hydroxide is small, so that the thallium-polluted soil thallium leaching concentration is remarkably increased along with the reduction of the molar ratio of the iron sulfate to the potassium permanganate, and the relative root growth ratio of the rice is remarkably reduced along with the reduction of the molar ratio of the iron sulfate to the potassium permanganate.
When the mol ratio of ferric sulfate to potassium permanganate is 2-6: 1 (numbers 4, 5 and 6 in table 1), in the process of mixing the activated carbon powder and the ferromanganese solution, permanganate acid radicals and iron ions react with undecomposed oily substances and simple substance carbon in the activated carbon powder to generate manganese oxide, iron-manganese oxide and hydrocarbon. And mixing the manganese-iron-carbon slurry with a sodium hydroxide solution, and reacting hydroxide ions in the sodium hydroxide solution with manganese oxide, iron-manganese oxide and hydrocarbon in the manganese-iron-carbon slurry to generate the carbon-carried iron-manganese oxide and hydroxide blend. Finally, the thallium-contaminated soil thallium leaching concentration after detoxification is lower than 0.87 mug/L, and the relative root growth ratio of rice is higher than 114%.
When the molar ratio of ferric sulfate to potassium permanganate is more than 6:1 (serial numbers 7, 8 and 9 in table 1), excessive ferric sulfate doping amount, less potassium permanganate doping amount and less generation amount of a mixture of iron manganese oxide, carbon-supported iron manganese oxide and hydroxide, so that the thallium leaching concentration of the detoxified thallium-polluted soil is obviously increased along with further increase of the molar ratio of the ferric sulfate to the potassium permanganate, and the relative root growth ratio of rice is obviously reduced along with further increase of the molar ratio of the ferric sulfate to the potassium permanganate.
In conclusion, the benefits and the cost are combined, and when the molar ratio of ferric sulfate to potassium permanganate is 2-6: 1 hour, is most favorable for realizing detoxification and restoration of thallium-contaminated soil.
Example 2 quality ratio of activated carbon powder to Potassium permanganate Effect on the Performance of a thallium contaminated soil remediation Fertilizer
1. Prepared thallium-polluted soil remediation fertilizer
(1) According to a molar ratio of 6:1, respectively weighing ferric sulfate and potassium permanganate, dissolving the ferric sulfate and potassium permanganate in water, and stirring until the ferric sulfate and the potassium permanganate are completely dissolved to prepare a ferromanganese solution;
(2) According to the molar ratio of sodium hydroxide to ferric sulfate of 4.5:1, weighing sodium hydroxide, dissolving the sodium hydroxide in water, and stirring the solution until the sodium hydroxide is completely dissolved to prepare a sodium hydroxide solution.
(3) According to the mass ratio of the activated carbon powder to the potassium permanganate of 25: 1. 30: 1. 40: 1. 50:1. 275: 1. 500: 1. 550: 1. 600: 1. 650:1 respectively weighing activated carbon powder. Mixing the activated carbon powder with the ferromanganese solution, and stirring for 2 hours to obtain nine groups of ferromanganese carbon slurries.
(4) And respectively mixing the nine groups of ferromanganese carbon slurry with a sodium hydroxide solution, stirring for 2 hours, drying and grinding to obtain nine groups of ferromanganese carbon powders.
(5) According to the mass ratio of 20:30:100, respectively weighing the plant ash, the zeolite powder and the ferromanganese carbon powder, mixing and uniformly stirring to obtain nine groups of thallium-polluted soil remediation fertilizers.
The preparation of the repaired thallium-contaminated soil, the toxicity leaching test, the detection of the thallium ion concentration and the detection of the root system growth of the repaired soil are the same as those in example 1.
2. Results of the experiment
Table 2 influence of mass ratio of activated carbon powder to potassium permanganate on performance of thallium contaminated soil remediation fertilizer
As can be seen from Table 2, when the mass ratio of the activated carbon powder to the potassium permanganate is less than 50:1 (numbers 1, 2 and 3 in table 2), the doping amount of the activated carbon powder is small, the permanganate is too much, and the undecomposed oily substances and simple substance carbon are less, so that the thallium leaching concentration of the detoxified thallium-polluted soil is obviously increased along with the reduction of the mass ratio of the activated carbon powder to the potassium permanganate, and the growth ratio of the relative root system of the rice is obviously reduced along with the reduction of the mass ratio of the activated carbon powder to the potassium permanganate.
When the mass ratio of the activated carbon powder to the potassium permanganate is 50-500: 1 (numbers 4, 5 and 6 in table 2), in the process of mixing the activated carbon powder and the ferromanganese solution, permanganate acid radicals and iron ions react with undecomposed oily substances and simple substance carbon in the activated carbon powder to generate manganese oxide, iron-manganese oxide and hydrocarbon. And mixing the manganese-iron-carbon slurry with a sodium hydroxide solution, and reacting hydroxide ions in the sodium hydroxide solution with manganese oxide, iron-manganese oxide and hydrocarbon in the manganese-iron-carbon slurry to generate the carbon-carried iron-manganese oxide and hydroxide blend. Finally, the thallium leaching concentration of the thallium-polluted soil is lower than 0.43 mu g/L, and the growth ratio of the rice relative to the root system is larger than 121%.
When the mass ratio of the activated carbon powder to the potassium permanganate is more than 500:1 (serial numbers 7, 8 and 9 in table 2), the activated carbon powder is too much, and the permanganate acid radicals and iron ions in the process of the activated carbon powder and ferromanganese solution react with undecomposed oily substances and simple substance carbon in the activated carbon powder insufficiently, so that the thallium leaching concentration of the detoxified thallium-polluted soil is increased remarkably as the mass ratio of the activated carbon powder to potassium permanganate is further increased, and the relative root growth ratio of rice is reduced remarkably as the mass ratio of the activated carbon powder to potassium permanganate is further increased.
In conclusion, the quality ratio of the activated carbon powder to the potassium permanganate is (50-500): 1, the detoxification and restoration of thallium-polluted soil are most favorably realized.
Example 3 influence of the quality ratio of plant ash, zeolite powder and ferromanganese carbon powder on the performance of thallium-contaminated soil remediation fertilizer
1. Prepared thallium-polluted soil remediation fertilizer
(1) According to a molar ratio of 6:1 ferric sulfate and potassium permanganate are respectively weighed and dissolved in water, and the mixture is stirred until the ferric sulfate and the potassium permanganate are completely dissolved to prepare a ferromanganese solution.
(2) According to the molar ratio of 6:1, weighing sodium hydroxide, dissolving the sodium hydroxide in water, and stirring until the sodium hydroxide is completely dissolved to prepare a sodium hydroxide solution.
(3) According to the mass ratio of the activated carbon powder to the potassium permanganate of 500:1 weighing activated carbon powder. Mixing the activated carbon powder and the ferromanganese solution, and stirring for 3.5 hours to obtain ferromanganese carbon slurry.
(4) Mixing the ferromanganese carbon slurry with a sodium hydroxide solution, stirring for 3.5 hours, drying and grinding to obtain ferromanganese carbon powder.
(5) According to the mass ratio of 2.5:15: 100. 3:15: 100. 4:15: 100. 5:7.5: 100. 5:10: 100. 5:12.5: 100. 5:15: 100. 20:15: 100. 35:15: 100. 5:30: 100. 20:30: 100. 35:30: 100. 5:45: 100. 20:45: 100. 35:45: 100. 35:50: 100. 35:55: 100. 35:60: 100. 40:45: 100. 45:45: 100. 47.5:45:100, respectively weighing the plant ash, the zeolite powder and the ferromanganese carbon powder, mixing and uniformly stirring to obtain 21 groups of thallium-polluted soil remediation fertilizers.
The preparation of the repaired thallium contaminated soil, the toxicity leaching test, the detection of the thallium ion concentration and the detection of the root system growth of the repaired soil are the same as those in the example 1.
2. Results of the experiment
TABLE 3 influence of the quality ratio of plant ash, zeolite powder, ferromanganese carbon powder on the performance of the thallium contaminated soil remediation fertilizer
As can be seen from Table 3, when the mass ratio of the plant ash to the ferromanganese carbon powder is less than or equal to 5:100, and the mass ratio of the zeolite powder to the ferromanganese carbon powder is less than or equal to 15:100 (serial numbers 1, 2, 3, 4, 5, 6 and 7 in table 3), the mixing amount of the plant ash and the zeolite powder is small, and the selective adsorption, efficient oxidation and effective fixation of thallium pollutants in the thallium-polluted soil interstitial fluid are all deteriorated, so that the thallium leaching concentration of the detoxified thallium-polluted soil is obviously increased along with the reduction of the mass ratio of the plant ash, the zeolite powder and the ferromanganese carbon powder, and the growth ratio of the rice relative to the root system is obviously reduced along with the reduction of the mass ratio of the plant ash, the zeolite powder and the ferromanganese carbon powder.
When the mass ratio of the plant ash to the ferromanganese carbon powder is 5-35: 100, wherein the mass ratio of the zeolite powder to the ferromanganese carbon powder is 15-45: 100 (serial numbers 8, 9, 10, 11, 12, 13 and 14 in table 3), mixing plant ash, zeolite powder and ferromanganese carbon powder, uniformly stirring, and after stirring thallium-polluted soil, realizing selective adsorption, efficient oxidation and effective fixation of thallium pollutants in thallium-polluted soil interstitial fluid under the synergistic action of the plant ash, the zeolite powder and the ferromanganese carbon powder, thereby realizing effective remediation of the thallium-polluted soil. Finally, the thallium-contaminated soil thallium leaching concentration after detoxification is lower than 0.1 mug/L, and the relative root growth ratio of rice is larger than 122%.
When the mass ratio of the plant ash to the ferromanganese carbon powder is more than or equal to 35:100, and the mass ratio of the zeolite powder to the ferromanganese carbon powder is more than or equal to 45:100 (numbers 15, 16, 17, 18, 19, 20 and 21 in Table 3), the thallium leaching concentration of the detoxified thallium-polluted soil and the growth ratio of the relative root system of the rice do not change obviously along with the further increase of the mass ratio of the plant ash, the zeolite powder and the ferromanganese carbon powder.
In conclusion, when the mass ratio of the plant ash, the zeolite powder and the ferromanganese carbon powder is 5-35: 15 to 45: and when the soil is 100 hours, the detoxification and restoration of thallium-polluted soil are most favorably realized.
Example 4 Effect of thallium-contaminated soil remediation Fertilizer dosage on thallium-contaminated soil remediation Effect
1. Prepared thallium-polluted soil remediation fertilizer
(1) According to a molar ratio of 6:1 respectively weighing ferric sulfate and potassium permanganate, dissolving in water, stirring until the ferric sulfate and potassium permanganate are completely dissolved, and preparing ferromanganese solution
(2) According to the molar ratio of sodium hydroxide to ferric sulfate of 6:1, weighing sodium hydroxide, dissolving the sodium hydroxide in water, and stirring the solution until the sodium hydroxide is completely dissolved to prepare a sodium hydroxide solution.
(3) According to the mass ratio of the activated carbon powder to the potassium permanganate of 500:1 weighing activated carbon powder. Mixing the activated carbon powder and the ferromanganese solution, and stirring for 3.5 hours to obtain ferromanganese carbon slurry.
(4) Mixing the ferromanganese carbon slurry with a sodium hydroxide solution, stirring for 3.5 hours, drying and grinding to obtain ferromanganese carbon powder. According to the mass ratio of 35:45:100, respectively weighing plant ash, zeolite powder and ferromanganese carbon powder, mixing and uniformly stirring to obtain the thallium-polluted soil remediation fertilizer.
2. Thallium contaminated soil remediation
Respectively mixing the components in a mass ratio of 2.5: 100. 7.5:100. 12.5: 100. 17.5: 100. 22.5: 100. 27.5:100, mixing the prepared thallium-contaminated soil remediation fertilizer with thallium-contaminated soil, adding 1ml of water into every 1mg of soil, aging and standing for 7 days to obtain six groups of repaired thallium-contaminated soil.
The toxicity leaching test, the thallium ion concentration detection and the detection of the root system growth of the restored soil are the same as those in the example 1.
3. Results of the experiment
TABLE 4 influence of thallium contaminated soil remediation Fertilizer dosage on thallium contaminated soil remediation Effect
As can be seen from Table 4, when the amount of the prepared thallium-contaminated soil remediation fertilizer is increased, the thallium leaching concentration of the thallium-contaminated soil can be further reduced, and the relative root growth ratio of the rice can be improved.
Comparative example 1 Effect of different comparative processes on the Performance of thallium-contaminated soil remediation fertilizers
1. Formulated thallium-polluted soil remediation fertilizer
The process of the invention comprises the following steps:
(1) According to a molar ratio of 6:1 respectively weighing ferric sulfate and potassium permanganate, dissolving in water, stirring until the ferric sulfate and potassium permanganate are completely dissolved, and preparing ferromanganese solution
(2) According to the molar ratio of 6:1, weighing sodium hydroxide, dissolving the sodium hydroxide in water, and stirring until the sodium hydroxide is completely dissolved to prepare a sodium hydroxide solution.
(3) According to the mass ratio of the activated carbon powder to the potassium permanganate of 500:1 weighing activated carbon powder. Mixing the activated carbon powder and the ferromanganese solution, and stirring for 3.5 hours to obtain ferromanganese carbon slurry.
(4) And mixing the ferromanganese carbon slurry with a sodium hydroxide solution, stirring for 3.5 hours, drying, and grinding to obtain ferromanganese carbon powder.
(5) According to the mass ratio of 35:45:100, weighing plant ash, zeolite powder and ferromanganese carbon powder, mixing and uniformly stirring to obtain the thallium-polluted soil remediation fertilizer.
Comparative process 1:
the steps (1) to (4) are consistent with the invention, the step (5) of the comparative process 1 is changed into the step without adding plant ash, and the plant ash is added according to the mass ratio of 45: and weighing zeolite powder and ferromanganese carbon powder by 100, mixing, and uniformly stirring to obtain the thallium-polluted soil remediation fertilizer.
Comparison technique 2:
steps (1) to (4) are consistent with the present invention, and step (5) of comparative process 1 is changed to be no zeolite powder added, according to the mass ratio of 35: and weighing plant ash and ferromanganese carbon powder by 100, mixing and uniformly stirring to obtain the thallium-polluted soil remediation fertilizer.
Preparation of the repaired thallium-contaminated soil, a toxicity leaching test, detection of thallium ion concentration and detection of root system growth of the repaired soil are the same as those in example 1.
2. Results of the experiment
TABLE 5 Effect of different comparative processes on the performance of thallium contaminated soil remediation fertilizers
| Serial number | Type of process | Thallium leaching concentration (μ g/L) | Relative root growth ratio of rice |
| 3 | The process of the invention | 0.063 | 128.06％ |
| 1 | Comparative Process 1 | 0.335 | 104.67％ |
| 2 | Comparative Process 2 | 0.234 | 108.95％ |
As can be seen from Table 5, the thallium leaching concentrations of the thallium-contaminated soil repaired by the thallium-contaminated soil repair fertilizers prepared by the comparative process 1 and the comparative process 2 are both obviously higher than those of the process of the invention, and the relative root growth ratio of the rice is obviously lower than that of the process grass of the invention. Therefore, in the thallium-polluted soil remediation, the wood ash, the zeolite powder and the ferromanganese carbon powder play a synergistic role, and the effect is best when the wood ash, the zeolite powder and the ferromanganese carbon powder are added at the same time.
Claims (8)
1. The preparation method of the thallium-contaminated soil remediation fertilizer is characterized by comprising the following steps of:
(1) Dissolving ferric sulfate and potassium permanganate in water, and stirring until the ferric sulfate and the potassium permanganate are completely dissolved to obtain a ferromanganese solution;
(2) Dissolving sodium hydroxide solid in water, and stirring until the sodium hydroxide is completely dissolved to obtain a sodium hydroxide solution;
(3) Mixing and stirring the activated carbon powder and the ferromanganese solution in the step (1) to obtain ferromanganese carbon slurry;
(4) Uniformly stirring the ferromanganese carbon slurry obtained in the step (3) and the sodium hydroxide solution obtained in the step (2), drying and grinding to obtain ferromanganese carbon powder;
(5) And (4) uniformly mixing the plant ash, the zeolite powder and the ferromanganese carbon powder in the step (4) to obtain the catalyst.
2. The preparation method of the thallium-contaminated soil remediation fertilizer as claimed in claim 1, wherein the molar ratio of the ferric sulfate to the potassium permanganate in step (1) is 0.5-9: 1.
3. the preparation method of the thallium-contaminated soil remediation fertilizer as claimed in claim 1, wherein the molar ratio of the sodium hydroxide solid in step (2) to the ferric sulfate in step (1) is 3 to 6:1.
4. the preparation method of the thallium-contaminated soil remediation fertilizer as claimed in claim 1, wherein the mass ratio of the activated carbon in step (3) to the potassium permanganate in step (1) is 25-650: 1.
5. the preparation method of the thallium-contaminated soil remediation fertilizer as claimed in claim 1, wherein the mass ratio of the plant ash, the zeolite powder and the ferromanganese carbon powder in step (5) is 2.5-47.5: 7.5-60: 100.
6. a thallium-contaminated soil remediation fertilizer produced by the production method as claimed in any one of claims 1 to 5.
7. The use of the thallium-contaminated soil remediation fertilizer of claim 6 for remediation of soil, wherein the use is carried out by mixing the thallium-contaminated soil remediation fertilizer of claim 6 with thallium-contaminated soil, stirring the mixture uniformly, spraying water uniformly, aging the mixture and allowing the mixture to stand.
8. The application of claim 7, wherein the mass ratio of the thallium-contaminated soil remediation fertilizer to the thallium-contaminated soil is 2.5 to 27.5:100.
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