CN113578945B - Method for improving repair efficiency of molasses on chromium-polluted soil - Google Patents
Method for improving repair efficiency of molasses on chromium-polluted soil Download PDFInfo
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- CN113578945B CN113578945B CN202110766052.XA CN202110766052A CN113578945B CN 113578945 B CN113578945 B CN 113578945B CN 202110766052 A CN202110766052 A CN 202110766052A CN 113578945 B CN113578945 B CN 113578945B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention relates to a method for improving the repair efficiency of molasses on chromium-polluted soil, which comprises the following steps: (1) Putting a certain amount of chromium-polluted soil into a container, adding sulfuric acid nitric acid aqueous solution, and mixing the sulfuric acid nitric acid aqueous solution with the chromium-polluted soil to obtain pretreated soil with pH less than 8; (2) And adding molasses, mixing the molasses with the pretreated soil, and placing the mixture under anaerobic conditions to form a chromium-reducible reduction system, wherein the reduction system comprises biological hydrogen and metabolic products generated after glycolysis of the molasses and hydrogen generated by capturing electrons by hydrogen ions of hydrogen sulfide in the soil, and repairing the pretreated soil by the reduction system to obtain repaired soil. The pH of the soil is regulated by adopting the sulfuric acid aqueous solution of nitric acid, so that the leaching rate of molasses to chromium in the soil can be further improved, and meanwhile, the reduction system generated under the anaerobic condition can further accelerate the remediation of heavy metal soil.
Description
Technical Field
The invention relates to the technical field of restoration of chromium-polluted soil, in particular to a method for improving efficiency of restoring chromium-polluted soil by molasses.
Background
Chromium is a geochemical element that is widely present in rock, minerals, soil, water and the atmosphere. In recent decades, humans have discharged significant amounts of chromium into the environment through steel production, coal mine smelting, electroplating, tanning, printing, papermaking, textile activities, and the like. Chromium has a valence of 0 to 6, while trivalent chromium Cr (III) and hexavalent chromium Cr (VI) are the most predominant and stable valence in the natural environment, with Cr (VI) being 100 times more toxic than Cr (III).
The existing treatment methods of chromium-polluted soil mainly comprise a chemical reduction method, a chemical leaching method, an electric restoration method and a biological restoration technology. The biological stimulation technology in the biological repair technology does not depend on exogenously added microorganisms, and is characterized in that the environment is changed to increase the biomass and activity of indigenous microorganisms, acetate, lactate or molasses and other substances are added to stimulate the growth of naturally existing bacteria in soil so as to promote the degradation of pollutants, and the biological stimulation technology has the advantages of good stability, no secondary pollution, low cost and the like, and becomes a research focus for the repair of Cr (VI) polluted soil. The soil is alkaline, so that the dissolution and reduction of chromium are greatly hindered, lactate or molasses components are independently added into the chromium-polluted soil, the soil restoration requirement still cannot be met, and the problem of low chromium leaching rate in the chromium-polluted soil exists.
Disclosure of Invention
The purpose of the invention is that: in order to overcome the defects of the prior art, the invention provides a method for improving the repair efficiency of molasses on chromium-polluted soil, which adopts sulfuric acid nitric acid aqueous solution as a soil pH regulator, can further improve the leaching rate of molasses on chromium in soil, and can further accelerate the repair of heavy metal soil by a reduction system generated under anaerobic conditions, thereby achieving the purpose of high heavy metal soil repair effect.
The technical scheme of the invention is as follows: the method for improving the repair efficiency of molasses on chromium-polluted soil is characterized by comprising the following steps of:
(1) Putting a certain amount of chromium-polluted soil into a container, adding sulfuric acid nitric acid aqueous solution, and mixing the sulfuric acid nitric acid aqueous solution with the chromium-polluted soil to obtain pretreated soil with pH less than 8;
(2) And adding molasses, mixing the molasses with the pretreated soil, and placing the mixture under anaerobic conditions to form a chromium-reducible reduction system, wherein the reduction system comprises biological hydrogen and metabolic products generated after glycolysis of the molasses and hydrogen generated by capturing electrons by hydrogen ions of hydrogen sulfide in the soil, and repairing the pretreated soil by the reduction system to obtain repaired soil.
Preferably, the metabolite in the step (2) is one or more of lactic acid, acetic acid and ethanol.
Preferably, the electrons in step (2) are generated during glycolysis of molasses under anaerobic conditions.
Preferably, the hydrogen sulfide is produced by reducing sulfate by sulfate-reducing bacteria present in the soil.
Preferably, in the step (1), the mass ratio of the sulfuric acid nitric acid aqueous solution to the chromium-contaminated soil is 1:10.
preferably, the pH of the aqueous sulfuric acid/nitric acid solution in step (1) is 3-5.
Preferably, the mass ratio of sulfuric acid to nitric acid in the sulfuric acid nitric acid aqueous solution in the step (1) is 2:1.
Preferably, the chromium-contaminated soil in the step (1) is air-dried, and the gravel and animal and plant residues in the chromium-contaminated soil are picked out and ground and screened by a 100-mesh sieve.
Preferably, the anaerobic condition in step (2) is generated by sealing the opening of the container with a film.
Preferably, the film may be a polyethylene film, a polyester film or a composite film.
Compared with the prior art, the invention has the following beneficial effects:
the reduction effect in the soil can be enhanced by reducing the pH value of the chromium-polluted soil, and experimental results show that the pH value of the soil is better compared with that of other acidic solutions by the sulfuric acid nitric acid aqueous solution with the mass ratio of 2 to 1, and the addition of nitrate ions effectively promotes the electron transmission in the hexavalent chromium reduction process and can further improve the leaching rate of molasses to chromium in the soil; meanwhile, molasses is added into pre-remediated soil, and is mixed and sealed by a polyethylene film, so that anaerobic environment can be promoted, under anaerobic conditions, molasses is used as organic matters to carry out glycolysis to generate biological hydrogen and metabolic products such as lactic acid, acetic acid, ethanol and the like, and can be used for reducing chromium, meanwhile, sulfate radical addition can promote the production of sulfate in the soil, the optimal pH value for the growth of sulfate reducing bacteria is about 7.0, the pH value is reduced to be beneficial to the survival of the sulfate reducing bacteria, the sulfate reducing bacteria can reduce the sulfate into sulfide and hydrogen sulfide, the hydrogen sulfide can be used as a reducing agent of hexavalent chromium, and under anaerobic conditions, hydrogen ions of the hydrogen sulfide are capturedElectrons generated in glycolysis of molassesFor example, ethanol releases electricity when converted to acetaldehyde and pyruvic acid Son) Hydrogen can be generated for reducing chromium, most of sulfate reducing bacteria belong to anaerobic bacteria, and the growth of the sulfate reducing bacteria can be promoted under anaerobic conditions.
Adjusting the pH value of the chromium-polluted soil by utilizing the sulfuric acid nitric acid aqueous solution, and reducing the pH value of the soil; the reduction system generated under anaerobic conditions can further accelerate the restoration of heavy metal soil, so that molasses has a remarkable effect of restoring chromium-polluted soil, and can greatly reduce heavy metal toxicity and increase stability, and the reduction system is low in cost, simple to operate and has a reduction rate of hexavalent chromium of more than 99%. The content of hexavalent chromium in the soil is reduced below a first land screening value in a soil pollution risk management and control standard (trial) of soil environmental quality construction land (GB 36600-2018), the risk of heavy metal chromium pollution is fundamentally reduced, and the treated soil can be further improved by adopting measures such as agronomic regulation, alternative planting and the like.
The method for restoring the soil heavy metal is simple and convenient to operate, and has obvious effect on chromium-polluted soil.
Detailed Description
The invention provides a method for improving the repair efficiency of molasses on chromium-polluted soil, which comprises the following steps: (1) Taking a certain amount of chromium-polluted soil, air-drying, picking out gravel and animal and plant residues in the chromium-polluted soil, grinding, sieving with a 100-mesh sieve, putting into a container, adding a sulfuric acid nitric acid aqueous solution, mixing the sulfuric acid nitric acid aqueous solution with the chromium-polluted soil, and wherein the mass ratio of the sulfuric acid nitric acid aqueous solution to the chromium-polluted soil is 1:10, the PH value of the sulfuric acid nitric acid aqueous solution is 3-5, and the mass ratio of sulfuric acid to nitric acid in the sulfuric acid nitric acid aqueous solution is 2:1, so as to obtain pretreated soil with PH less than 8; (2) Adding molasses, mixing the molasses with pretreated soil, sealing the opening of a container by a film (polyethylene film, polyester film or composite film) to promote the generation of anaerobic conditions, forming a chromium-reducible reduction system under anaerobic conditions, wherein the reduction system comprises biological hydrogen and metabolic products (one or more of lactic acid, acetic acid and ethanol) generated after glycolysis of the molasses and hydrogen generated by electrons generated in the glycolysis process of the molasses captured by hydrogen ions of hydrogen sulfide in the soil, wherein the hydrogen sulfide is generated by reducing sulfate by sulfate reducing bacteria in the soil, and repairing the pretreated soil by the reduction system to obtain repaired soil.
Experiment 1: determining the efficiency of reducing hexavalent chromium in chromium-contaminated soil under the conditions of different molasses addition amounts, water holding capacity and culture temperature
1) Determining leaching amount of hexavalent chromium and total chromium in chromium-contaminated soil under different molasses addition amounts
Weighing 5 parts of 50g chromium-polluted soil, placing the soil in a corresponding container, keeping the water holding capacity of the chromium-polluted soil to be 80%, respectively adding molasses with mass fractions of 1%, 2%, 3%, 4% and 5% and uniformly stirring, placing 5 parts of repair soil in a 25 ℃ incubator for culturing, and measuring hexavalent chromium and total chromium content in the repair soil every other week.
2) Determining the efficiency of molasses in reducing hexavalent chromium in chromium-contaminated soil under different water holding capacity conditions
Weighing 5 parts of 50g chromium-contaminated soil, placing the soil in a corresponding container, respectively setting the water holding capacity of 5 parts of chromium-contaminated soil to be 40%, 60%, 80%, 100% and 120%, adding molasses with the mass fraction of 3% into each part of soil, uniformly stirring, placing 5 parts of repair soil into a 25 ℃ incubator for culturing, and measuring hexavalent chromium and total chromium content in the repair soil every other week.
3) Determining the efficiency of molasses in reducing hexavalent chromium in chromium contaminated soil at different culture temperatures
Weighing 3 parts of 50g of chromium-polluted soil, placing the soil in a corresponding container, keeping the water holding capacity of the chromium-polluted soil to be 80%, adding 3% of molasses in mass fraction into each part of soil, uniformly stirring, respectively placing 3 parts of restored soil into an incubator at 25 ℃, 35 ℃ and 45 ℃ for culturing, and measuring hexavalent chromium and total chromium content in the restored soil every other week.
TABLE 1 hexavalent chromium leaching from chromium contaminated soil with different molasses additions
| Molasses addition (%) | Hexavalent chromium content (mg/kg) | 7 days (%) | 14 days (%) | 21 days (%) | 28 days (%) |
| 1 | 208.20 | 43.20 | 32.56 | 18.28 | 52.14 |
| SD±% | 12.82 | 14.62 | 3.59 | 20 | 2.82 |
| 2 | 250.26 | 47.92 | 49.22 | 58.75 | 77.19 |
| SD±% | 4.87 | 9.99 | 7.95 | 6.92 | 4.87 |
| 3 | 232.31 | 46.39 | 73.22 | 78.85 | 80.84 |
| SD±% | 1.02 | 10.64 | 3.85 | 5.13 | 1.02 |
| 4 | 254.36 | 69.44 | 80.91 | 80.17 | 84.21 |
| SD±% | 5.90 | 3.08 | 3.14 | 5.42 | 5.90 |
| 5 | 236.41 | 72.27 | 83.61 | 84.64 | 86.11 |
| SD±% | 15.90 | 7.04 | 3.20 | 2.56 | 1.90 |
( And (3) injection: each treatment was set up in 3 replicates, and the data in the table are the mean and standard deviation of 3 replicates. )
TABLE 2 Total chromium leaching from chromium contaminated soil with different molasses addition
| Molasses addition (%) | Total chromium content (mg/L) | 7 days (%) | 14 days (%) | 21 days (%) | 28 days (%) |
| 1 | 15.12 | 11.15 | 13.81 | 14.55 | 16.18 |
| SD±% | 2.19 | 0.62 | 1.69 | 2.55 | 1.80 |
| 2 | 16.12 | 13.88 | 12.61 | 9.20 | 15.79 |
| SD±% | 0.54 | 0.78 | 0.46 | 0.55 | 2.01 |
| 3 | 21.85 | 18.08 | 17.19 | 17.39 | 13.05 |
| SD±% | 3.51 | 0.38 | 0.51 | 1.66 | 1.05 |
| 4 | 18.32 | 15.30 | 14.62 | 14.52 | 12.42 |
| SD±% | 2.68 | 0.82 | 0.68 | 2.02 | 1.50 |
| 5 | 17.69 | 14.71 | 13.11 | 12.38 | 5.99 |
| SD±% | 4.52 | 0.21 | 1.39 | 0.88 | 1.66 |
The test result shows that the molasses has remarkable effect of repairing hexavalent chromium in soil by taking the molasses as a reducing agent, and the reduction rate of adding 5% of molasses is highest along with the increase of the adding amount, and reaches 86.11%; and as the adding amount of molasses is increased, the leaching amount of total chromium is reduced, the leaching amount of total chromium is the lowest when 5% of molasses is added, the leaching rate of total chromium is not greatly influenced by a small amount of molasses, and when the adding amount is more than 3%, the leaching amount of total chromium starts to be reduced. The molasses is used as a reducing agent, so that the molasses has an obvious effect of repairing hexavalent chromium in soil and has a certain effect of stabilizing chromium in the soil.
TABLE 3 efficiency of molasses in reducing hexavalent chromium in chromium contaminated soil with varying water holding capacity
| Water holding capacity (%) | Hexavalent chromium content (mg/kg) | 7 days (%) | 14 days (%) | 21 days (%) | 28 days (%) |
| 40 | 232.20 | 36.30 | 49.13 | 50.61 | 56.26 |
| SD±% | 5.43 | 3.26 | 4.10 | 11.73 | 8.14 |
| 60 | 234.27 | 48.22 | 64.72 | 68.97 | 67.15 |
| SD±% | 7.45 | 2.76 | 5.83 | 4.68 | 3.33 |
| 80 | 256.31 | 64.56 | 80.04 | 83.21 | 88.73 |
| SD±% | 8.54 | 10.5 | 4.17 | 2.18 | 4.50 |
| 100 | 246.35 | 72.77 | 88.24 | 90.96 | 92.00 |
| SD±% | 9.45 | 0.90 | 7.05 | 4.00 | 3.00 |
| 120 | 226.41 | 78.05 | 86.50 | 95.46 | 96.84 |
| SD±% | 2.20 | 6.47 | 3.08 | 3.01 | 3.33 |
( And (3) injection: each treatment was set up in 3 replicates, and the data in the table are the mean and standard deviation of 3 replicates. )
The test result shows that the water holding capacity of the soil has obvious influence on hexavalent chromium reduction, and the hexavalent chromium in the soil is released more fully along with the increase of the water holding capacity, so that the reduction rate is gradually increased. When the water holding capacity reaches 120%, the reduction rate reaches 96.84%, and hexavalent chromium after reduction can reach below a first land control value in soil environmental quality construction land soil pollution risk control Standard (trial) GB 36600-2018, which shows that the increase of the water content can effectively promote the improvement of the reduction rate.
TABLE 4 efficiency of molasses reduction of hexavalent chromium in chromium contaminated soil at different culture temperatures
| Temperature (temperature) | Hexavalent chromium content | 7 days (%) | 14 days (%) | 21 days (%) | 28 days (%) |
| 25 | 260.51 | 53.19 | 64.80 | 73.767 | 91.67 |
| SD±% | 10.02 | 10.77 | 2.56 | 0.53 | 0.26 |
| 35 | 253.49 | 29.94 | 56.34 | 71.41 | 84.16 |
| SD±% | 5.90 | 0.25 | 8.97 | 24.62 | 4.87 |
| 45 | 242.97 | 5.17 | 55.30 | 58.15 | 70.62 |
| SD±% | 15.90 | 9.49 | 18.20 | 7.69 | 7.18 |
( And (3) injection: each treatment was set up in 3 replicates, and the data in the table are the mean and standard deviation of 3 replicates. )
The test results show that the reduction of hexavalent chromium is facilitated at 25 ℃ and 35 ℃, the reduction efficiency is in positive correlation with the culture time, the preservation of moisture and the growth of microorganisms are not facilitated due to the fact that the temperature is too high, and the reduction efficiency is highest at 25 ℃ and reaches 91.67% at three temperatures.
Experiment 2: determining the efficiency of molasses for reducing hexavalent chromium in chromium-contaminated soil under different acid solutions, different proportions of sulfuric acid aqueous solutions and different amounts of sulfuric acid aqueous solutions
1) Determination of hexavalent chromium efficiency in molasses reduced chromium contaminated soil in different acid solutions
Weighing 4 parts of 50g chromium-polluted soil, placing the soil in a corresponding container, keeping the water holding capacity of the chromium-polluted soil to be 120%, respectively adding 10mL of sulfuric acid, nitric acid, hydrochloric acid and acetic acid with the pH value of 3 to adjust the pH value of the soil to be less than 8, adding 5% by mass of molasses into each part of the soil, uniformly stirring, placing 4 parts of the restored soil into a 25 ℃ incubator for culturing, and measuring the hexavalent chromium content in the restored soil for one week.
2) Determination of hexavalent chromium efficiency in molasses reduced chromium contaminated soil in different proportions of sulfuric acid nitric acid aqueous solution
Weighing 4 parts of 50g chromium-polluted soil, placing the soil in a corresponding container, keeping the water holding capacity of the chromium-polluted soil to be 120%, respectively adding sulfuric acid and nitric acid aqueous solutions with the mass ratio of sulfuric acid to nitric acid of 1:1,2:1,3:1 and 3:2 to adjust the pH of the soil to be less than 8, adding molasses with the mass ratio of 5% into each part of the soil to stir uniformly, placing 4 parts of the restored soil into a 25 ℃ incubator for culturing, and measuring the hexavalent chromium content in the restored soil for one week.
3) Determining the efficiency of molasses in reducing hexavalent chromium in chromium-contaminated soil with different amounts of aqueous nitric acid sulphate solution
Weighing 4 parts of 50g chromium-polluted soil, placing the soil in a corresponding container, keeping the water holding capacity of the chromium-polluted soil to be 120%, respectively adding 5, 10, 15 and 20mL of sulfuric acid nitric acid aqueous solution, wherein the mass ratio of sulfuric acid to nitric acid is 2:1, the pH value of the sulfuric acid nitric acid aqueous solution is 3, adding molasses with the mass fraction of 5% into each part of soil, uniformly stirring, placing 4 parts of restored soil into a 25 ℃ incubator for culturing, and measuring the hexavalent chromium content in the restored soil for one week.
TABLE 5 efficiency of molasses reduction of hexavalent chromium in chromium contaminated soil with different acid solutions
| Different acids | ck | Hydrochloric acid | Acetic acid | Nitric acid | Sulfuric acid |
| Day 0 (mg/kg) | 242.28 | 240.89 | 253.42 | 207.77 | 262.32 |
| SD±% | 4.34 | 12.53 | 5.24 | 1.98 | 3.90 |
| 7 days (mg/kg) | 55.03 | 44.80 | 47.42 | 22.46 | 39.95 |
| SD±% | 1.58 | 10.93 | 14.02 | 11.34 | 5.17 |
| Reduction rate | 77.28 | 81.03 | 81.29 | 89.19 | 84.77 |
TABLE 6 variation of soil pH with addition of different acidic solutions to soil
The test result shows that the hexavalent chromium reduction rate is highest after sulfuric acid and nitric acid aqueous solution are added; meanwhile, the pH plays a key role in the reduction process, the pH is lower than other soils after the soil with the mass ratio of 2 to 1 is added for 7 days, the pH is reduced to below 6.8, the release of hexavalent chromium fixed in the soil is promoted, the reduction condition is optimized due to the reduction of the pH, and the reduction efficiency can reach more than 99%.
TABLE 7 efficiency of molasses reduction of hexavalent chromium in chromium contaminated soil with aqueous sulfuric acid nitric acid solutions of different proportions
| Acidic solution | ck | 1/1 | 2/1 | 3/1 | 3/2 |
| Day 0 | 242.28 | 240.98 | 247.85 | 232.26 | 230.41 |
| SD±% | 4.34 | 4.37 | 1.67 | 18.74 | 12.61 |
| For 7 days | 55.03 | 36.98 | 11.86 | 38.78 | 58.50 |
| SD±% | 1.58 | 14.88 | 3.30 | 7.63 | 0.38 |
| Reduction rate | 77.28 | 84.65 | 95.21 | 83.30 | 74.61 |
The test results show that the mass ratio is 2: the reduction rate of the aqueous solution of sulfuric acid and nitric acid of 1 is highest and reaches 95.21 percent.
TABLE 8 efficiency of molasses reduction of hexavalent chromium in chromium contaminated soil with different aqueous sulfuric acid and nitric acid additions
| V（mL） | Hexavalent chromium content | 7 days (%) | 14 days (%) | 21 days (%) | 28 days (%) |
| 0（pH=8.36） | 210.98 | 76.23 | 89.12 | 94.90 | 97.32 |
| SD±% | 15.90 | 21 | 3.56 | 3.20 | 3.56 |
| 5(pH=8.12) | 237.00 | 88.55 | 93.17 | 99.59 | 99.91 |
| SD±% | 12.82 | 3.20 | 3.26 | 0.77 | 0.04 |
| 10(pH=8.01) | 252.07 | 96.73 | 97.00 | 99.93 | 99.90 |
| SD±% | 4.82 | 3.59 | 0.88 | 0.04 | 0.03 |
| 15(pH=7.89) | 207.55 | 77.55 | 96.46 | 99.93 | 99.90 |
| SD±% | 8.02 | 9.34 | 1.67 | 0.01 | 0.02 |
| 20(pH=7.74) | 229.06 | 85.52 | 86.60 | 99.92 | 99.90 |
| SD±% | 5.90 | 3.29 | 5.92 | 0.02 | 0.03 |
( And (3) injection: each treatment was set up in 3 replicates, and the data in the table are the mean and standard deviation of 3 replicates. )
The test results showed that the hexavalent chromium reduction rate after adding 10ml of aqueous sulfuric acid nitric acid solution was highest.
In summary, after the pH of the chromium-contaminated soil is adjusted by using the aqueous solution of sulfuric acid and nitric acid, the pH of the soil is reduced; the reduction system generated under anaerobic conditions can further accelerate the restoration of heavy metal soil, so that molasses has a remarkable effect of restoring chromium-polluted soil, and can greatly reduce heavy metal toxicity and increase stability, and the reduction system is low in cost, simple to operate and has a reduction rate of hexavalent chromium of more than 99%. The content of hexavalent chromium in the soil is reduced below a first land screening value in a soil pollution risk management and control standard (trial) of soil environmental quality construction land (GB 36600-2018), the risk of heavy metal chromium pollution is fundamentally reduced, and the treated soil can be further improved by adopting measures such as agronomic regulation, alternative planting and the like.
Claims (7)
1. The method for improving the repair efficiency of molasses on chromium-polluted soil is characterized by comprising the following steps of;
(1) Putting a certain amount of chromium-polluted soil into a container, adding sulfuric acid nitric acid aqueous solution, and mixing the sulfuric acid nitric acid aqueous solution with the chromium-polluted soil to obtain pretreated soil with pH less than 8;
(2) Adding molasses, mixing the molasses with the pretreated soil, and placing the mixture under anaerobic conditions to form a chromium-reducible reduction system, wherein the reduction system comprises biological hydrogen and metabolic products generated by glycolysis of the molasses and hydrogen generated by capturing electrons by hydrogen ions of hydrogen sulfide in the soil, and repairing the pretreated soil by the reduction system to obtain repaired soil;
wherein, the mass ratio of the sulfuric acid aqueous solution of nitric acid to the chromium-polluted soil is 1:10, the pH value of the sulfuric acid nitric acid aqueous solution is 3-5, and the mass ratio of sulfuric acid to nitric acid in the sulfuric acid nitric acid aqueous solution is 2:1.
2. The method for improving the repair efficiency of molasses on chromium contaminated soil according to claim 1, wherein the method comprises the following steps: the metabolic product generated by glycolysis of the molasses in the step (2) is one or more of lactic acid, acetic acid and ethanol.
3. The method for improving the repair efficiency of molasses on chromium contaminated soil according to claim 1, wherein the method comprises the following steps: the electrons in step (2) are generated during glycolysis of molasses under anaerobic conditions.
4. The method for improving the repair efficiency of molasses on chromium contaminated soil according to claim 1, wherein the method comprises the following steps: the hydrogen sulfide in step (2) is produced by reducing sulfate by sulfate-reducing bacteria present in the soil.
5. The method for improving the repair efficiency of molasses on chromium contaminated soil according to claim 1, wherein the method comprises the following steps: and (3) air-drying the chromium-polluted soil in the step (1), and grinding and sieving the chromium-polluted soil with a 100-mesh sieve after removing gravels and animal and plant residues in the chromium-polluted soil.
6. The method for improving the repair efficiency of molasses on chromium contaminated soil according to claim 1, wherein the method comprises the following steps: the anaerobic condition in step (2) is produced by sealing the opening of the container with a film.
7. The method for improving the repair efficiency of molasses on chromium contaminated soil according to claim 6, wherein the method comprises the following steps: the film can be polyethylene film, polyester film or composite film.
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