CN112625692B - Technological method for producing soil remediation agent by using turmeric residue - Google Patents
Technological method for producing soil remediation agent by using turmeric residue Download PDFInfo
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Abstract
The invention relates to a process method for producing a soil remediation agent by using turmeric residue, which comprises the following steps: cleaning and removing impurities from the turmeric residue, drying, crushing, sieving, performing anaerobic fermentation on one part of the turmeric residue to generate organic acid, preparing the other part of the turmeric residue into biochar, soaking the biochar in ferric chloride solution for modification and activation to prepare iron-based modified activated carbon, and mixing an anaerobic fermentation product with the iron-based modified activated carbon in a ratio of 4-6:1 for repairing chromium-polluted soil. The soil remediation agent produced by the technical method for producing the soil remediation agent by using the turmeric residue provided by the invention has the advantages of low production and use cost, capability of carrying out in-situ remediation on chromium-contaminated soil, good remediation effect and stability.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a process method for producing a soil remediation agent by using turmeric residue.
Background
In recent years, with the rapid development of industrial and agricultural industries and the promotion of urbanization construction, the problem of soil pollution in China is becoming more serious, and if the polluted soil is not effectively managed and repaired, a plurality of environmental problems and social disputes may be caused. Among many soil pollutions, heavy metal pollution is the most harmful to the ecological chain. In heavy metal pollution, chromium pollution is an important aspect, if the content of chromium in soil is too much, the chromium can be enriched by plants and animals and enter human bodies, and the harm to the health of human bodies is great, and the chromium has two valence states of trivalent and hexavalent states in the environment, so that the toxicity of hexavalent chromium is stronger and is easier to be absorbed by plants, while the toxicity of trivalent chromium is weaker and is generally not easy to be absorbed.
According to the characteristics of heavy metal contaminated soil, the remediation technology mainly comprises engineering measures, a physical and chemical method, a plant remediation method, a microorganism remediation method and the like, wherein the engineering measures are thorough and stable in remediation, but the investment is high; the physical and chemical repair method can repair in situ, but has high repair cost and is easy to generate secondary pollution; the plant and microorganism repairing method has strong applicability, but is greatly limited by environmental factors and has higher requirements on soil conditions. Therefore, a repair method capable of in-situ repair, with good repair effect and low cost is urgently needed to be found.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a process method for producing a soil remediation agent by using turmeric residue, the soil remediation agent produced by the method has lower production and use cost, can carry out in-situ remediation on chromium-contaminated soil, and has good and stable remediation effect.
The technical scheme for solving the technical problems is as follows: a process method for producing a soil remediation agent by using turmeric residue comprises the following steps:
cleaning and removing impurities from the turmeric residue, drying, crushing, sieving, performing anaerobic fermentation on one part of the turmeric residue to generate organic acid, preparing the other part of the turmeric residue into biochar, soaking the biochar in ferric chloride solution for modification and activation to prepare iron-based modified activated carbon, and mixing an anaerobic fermentation product with the iron-based modified activated carbon in a ratio of 4-6:1 for repairing chromium-polluted soil.
Preferably, the method for producing organic acid by anaerobic fermentation comprises the following steps:
s1, pretreating turmeric residue, namely cleaning the turmeric residue with clear water, removing impurities, drying until the moisture content is 8-15%, crushing, passing through a 60-mesh sieve, and taking undersize for later use;
s2, carrying out enzymolysis on the turmeric residue, adjusting the water content of the pretreated turmeric residue to 50% -65%, adding a mixed fermentation microbial inoculum according to the addition proportion of 0.1% -1%, wherein the mixed fermentation microbial inoculum comprises bacillus subtilis, saccharomycetes, Aspergillus niger and Trichoderma harzianum, and carrying out aerobic fermentation for 3-7 d;
s3, fermenting the turmeric dregs, mixing the enzymolyzed turmeric dregs and domesticated anaerobic sludge according to the ratio of 6:1, placing the mixture in a sealed container for anaerobic fermentation for 10-15 days, and keeping the fermentation temperature at 30-40 ℃ in the fermentation process;
s4, drying the turmeric residue, drying the fermentation product obtained in the step S3, controlling the water content to be 15-25% and the drying temperature to be 40-70 ℃, and obtaining the organic matrix containing the organic acid.
Preferably, the preparation method of the iron-based modified activated carbon comprises the following steps:
s1, preprocessing the turmeric residue, cleaning the turmeric residue to remove impurities in the turmeric residue, drying, crushing and sieving the cleaned turmeric residue;
s2, pyrolyzing and carbonizing the turmeric slag, namely heating the pretreated turmeric slag in a tube furnace at the heating rate of 5-15 ℃/min, maintaining the temperature for 0.5-1.5h for pyrolyzing and carbonizing when the sample is heated to 550-650 ℃, and cooling to room temperature after pyrolysis is finished and taking out;
s3, dipping the turmeric slag, namely dipping the turmeric slag subjected to pyrolysis carbonization in ferric chloride solution with the concentration of 0.05-0.15mol/L, wherein the dipping ratio is that the mass ratio of the turmeric slag to the ferric chloride solution is 1-2: 1;
s4, modifying the turmeric residue, namely placing the soaked turmeric residue in an oscillating box to oscillate for 2-5h, and modifying the turmeric residue;
s5, drying the turmeric slag, drying the modified turmeric slag at the temperature of 50-80 ℃, wherein the water content of the dried turmeric slag is 5% -15%, and obtaining the iron-based modified activated carbon.
Preferably, in step S2, all of bacillus subtilis, yeast, aspergillus niger and trichoderma harzianum are commercially available raw bacterial powder products, the number of effective viable bacteria is 100 hundred million cfu/g, and the mixing ratio of the four bacterial agents is bacillus subtilis: yeast: aspergillus niger: trichoderma harzianum 2:0.5:0.3: 0.2.
Preferably, in the step S3, the temperature during the anaerobic fermentation is 37 ℃.
Preferably, in the step S4, the drying temperature is 55 ℃.
Preferably, in the step S3, the concentration of the ferric chloride solution is 0.1mol/L, and the dipping ratio is that the yellow ginger residue: ferric chloride solution ═ 1.5: 1.
Preferably, in step S5, the oscillation time is 3 h.
Preferably, in the step S6, the drying temperature is 60 ℃.
Preferably, the mixing ratio of the organic acid to the iron-based modified activated carbon is 5: 1.
The invention has the beneficial effects that: the turmeric residue is respectively subjected to anaerobic fermentation and carbonization modification processes to produce an organic matrix rich in organic acid and iron-based modified activated carbon, the organic acid can reduce hexavalent chromium in soil into trivalent chromium, the toxicity of the chromium is reduced, and the trivalent chromium is easy to react with other ions in the soil to form a residue state which cannot be absorbed and utilized by plants; the iron-based modified activated carbon has a large specific surface area, can adsorb chromium ions, iron ions chelated on the activated carbon can promote reduction of hexavalent chromium by organic acid, the iron ions and the iron ions have a synergistic effect, the repair effect is obviously improved, the yellow ginger extraction waste is used as a raw material, the production and use cost is reduced, and the repair agent can repair chromium-polluted soil in situ.
Detailed Description
The principles and features of this invention are described below in conjunction with specific embodiments, the examples given are intended to illustrate the invention and are not intended to limit the scope of the invention.
Example 1
A process method for producing a soil remediation agent by using turmeric residue comprises the following steps:
(1) anaerobic fermentation is carried out to produce organic acid, and the steps are as follows:
s1, pretreating turmeric residue, namely cleaning the turmeric residue with clear water, removing impurities, drying until the water content is 8%, crushing, passing through a 60-mesh sieve, and taking undersize for later use;
s2, carrying out enzymolysis on the turmeric residues, adjusting the water content of the pretreated turmeric residues to 50%, adding a mixed fermentation microbial inoculum according to the addition proportion of 0.1%, wherein the mixed fermentation microbial inoculum comprises bacillus subtilis, saccharomycetes, aspergillus niger and trichoderma harzianum, and carrying out aerobic fermentation for 3 d;
s3, fermenting the turmeric dregs, mixing the enzymatically hydrolyzed turmeric dregs and domesticated anaerobic sludge according to a ratio of 6:1, placing the mixture in a sealed container for anaerobic fermentation for 11 days, and keeping the fermentation temperature at 33 ℃ in the fermentation process;
s4, drying the turmeric residue, drying the fermentation product obtained in the step S3, controlling the water content to be 17 percent and the drying temperature to be 45 ℃, and obtaining the organic matrix containing the organic acid.
(2) The preparation method of the iron-based modified activated carbon comprises the following steps:
s1, preprocessing the turmeric residue, cleaning the turmeric residue to remove impurities in the turmeric residue, drying, crushing and sieving the cleaned turmeric residue;
s2, pyrolyzing and carbonizing the turmeric slag, namely heating the pretreated turmeric slag in a tube furnace at a heating rate of 8 ℃/min, maintaining for 0.6h for pyrolyzing and carbonizing when the sample is heated to 550 ℃, cooling to room temperature after pyrolysis is finished, and taking out;
s3, dipping the turmeric slag, namely dipping the pyrolytic carbonized turmeric slag in ferric chloride solution with the concentration of 0.7mol/L, wherein the dipping ratio is that the mass ratio of the turmeric slag to the ferric chloride solution is 1: 1;
s4, modifying the turmeric residue, namely placing the soaked turmeric residue in an oscillating box to oscillate for 2.5 hours to modify the turmeric residue;
s5, drying the turmeric slag, drying the modified turmeric slag at the drying temperature of 55 ℃, wherein the water content of the dried turmeric slag is 8 percent, and obtaining the iron-based modified activated carbon.
(3) Mixing materials:
and (3) fully and uniformly mixing the organic matrix containing the organic acid and the iron-based modified activated carbon according to the proportion of 4:1 to obtain the soil remediation agent.
Example 2
A process method for producing a soil remediation agent by using turmeric residue comprises the following steps:
(1) anaerobic fermentation is carried out to produce organic acid, and the steps are as follows:
s1, pretreating turmeric residue, namely cleaning the turmeric residue with clear water, removing impurities, drying until the water content is 15%, crushing, passing through a 60-mesh sieve, and taking undersize for later use;
s2, carrying out enzymolysis on the turmeric residue, adjusting the water content of the pretreated turmeric residue to 60%, and adding a mixed fermentation microbial inoculum according to the addition proportion of 0.8%, wherein the mixed fermentation microbial inoculum comprises bacillus subtilis, saccharomycetes, Aspergillus niger and Trichoderma harzianum, and carrying out aerobic fermentation for 6 d;
s3, fermenting the turmeric dregs, mixing the enzymatically hydrolyzed turmeric dregs and domesticated anaerobic sludge according to a ratio of 6:1, placing the mixture in a sealed container for anaerobic fermentation for 15 days, and keeping the fermentation temperature at 40 ℃ in the fermentation process;
s4, drying the turmeric residue, drying the fermentation product obtained in the step S3, controlling the water content to be 25% and the drying temperature to be 70 ℃, and obtaining the organic matrix containing the organic acid.
(2) The preparation method of the iron-based modified activated carbon comprises the following steps:
s1, preprocessing the turmeric residue, cleaning the turmeric residue to remove impurities in the turmeric residue, drying, crushing and sieving the cleaned turmeric residue;
s2, pyrolyzing and carbonizing the turmeric slag, namely heating the pretreated turmeric slag in a tube furnace at the heating rate of 12 ℃/min, keeping the temperature for 1.5h for pyrolyzing and carbonizing when the sample is heated to 650 ℃, cooling to room temperature after pyrolysis is finished, and taking out;
s3, dipping the turmeric residue, namely dipping the turmeric residue after pyrolysis and carbonization in ferric chloride solution with the concentration of 0.12mol/L, wherein the dipping ratio is that the mass ratio of the turmeric residue to the ferric chloride solution is 2: 1;
s4, modifying the turmeric residue, namely placing the soaked turmeric residue in an oscillating box to oscillate for 5 hours to modify the turmeric residue;
s5, drying the turmeric slag, drying the modified turmeric slag at 75 ℃, wherein the water content of the dried turmeric slag is 15%, and obtaining the iron-based modified activated carbon.
(3) Mixing materials:
and (3) fully and uniformly mixing the organic matrix containing the organic acid and the iron-based modified activated carbon according to the proportion of 6:1 to obtain the soil remediation agent.
Example 3
A process method for producing a soil remediation agent by using turmeric residue comprises the following steps:
(1) anaerobic fermentation is carried out to produce organic acid, and the steps are as follows:
s1, pretreating turmeric residue, namely cleaning the turmeric residue with clear water, removing impurities, drying until the water content is 10%, crushing, passing through a 60-mesh sieve, and taking undersize for later use;
s2, carrying out enzymolysis on the turmeric residue, adjusting the water content of the pretreated turmeric residue to 55%, adding a mixed fermentation microbial inoculum according to the addition proportion of 1%, wherein the mixed fermentation microbial inoculum comprises bacillus subtilis, saccharomycetes, Aspergillus niger and Trichoderma harzianum, and carrying out aerobic fermentation for 7 d;
s3, fermenting the turmeric dregs, mixing the enzymatically hydrolyzed turmeric dregs and domesticated anaerobic sludge according to a ratio of 6:1, placing the mixture in a sealed container for anaerobic fermentation for 12 days, and keeping the fermentation temperature at 37 ℃ in the fermentation process;
s4, drying the turmeric residue, drying the fermentation product obtained in the step S3, controlling the water content to be 20% and the drying temperature to be 55 ℃, and obtaining the organic matrix containing the organic acid.
(2) The preparation method of the iron-based modified activated carbon comprises the following steps:
s1, preprocessing the turmeric residue, cleaning the turmeric residue to remove impurities in the turmeric residue, drying, crushing and sieving the cleaned turmeric residue;
s2, pyrolyzing and carbonizing the turmeric slag, namely heating the pretreated turmeric slag in a tube furnace at a heating rate of 10 ℃/min, keeping the temperature for 1h for pyrolyzing and carbonizing when a sample is heated to 600 ℃, cooling to room temperature after pyrolysis is finished, and taking out;
s3, dipping the turmeric slag, namely dipping the pyrolytic carbonized turmeric slag in ferric chloride solution with the concentration of 0.1mol/L, wherein the dipping ratio is that the mass ratio of the turmeric slag to the ferric chloride solution is 1.5: 1;
s4, modifying the turmeric residue, namely placing the soaked turmeric residue in an oscillating box to oscillate for 3 hours to modify the turmeric residue;
s5, drying the turmeric slag, drying the modified turmeric slag at the drying temperature of 60 ℃, wherein the water content of the dried turmeric slag is 10 percent, and obtaining the iron-based modified activated carbon.
(3) Mixing materials:
and (3) fully and uniformly mixing the organic matrix containing the organic acid and the iron-based modified activated carbon according to the proportion of 5:1 to obtain the soil remediation agent.
Comparative example 1
A process method for producing a soil remediation agent by using turmeric residue comprises the following steps:
s1, pretreating turmeric residue, namely cleaning the turmeric residue with clear water, removing impurities, drying until the water content is 10%, crushing, passing through a 60-mesh sieve, and taking undersize for later use;
s2, carrying out enzymolysis on the turmeric residue, adjusting the water content of the pretreated turmeric residue to 55%, adding a mixed fermentation microbial inoculum according to the addition proportion of 1%, wherein the mixed fermentation microbial inoculum comprises bacillus subtilis, saccharomycetes, Aspergillus niger and Trichoderma harzianum, and carrying out aerobic fermentation for 7 d;
s3, fermenting the turmeric dregs, mixing the enzymatically hydrolyzed turmeric dregs and domesticated anaerobic sludge according to a ratio of 6:1, placing the mixture in a sealed container for anaerobic fermentation for 12 days, and keeping the fermentation temperature at 37 ℃ in the fermentation process;
s4, drying the turmeric residue, drying the fermentation product obtained in the step S3, controlling the water content to be 20%, and the drying temperature to be 55 ℃, thus obtaining the soil remediation agent.
Comparative example 2
A process method for producing a soil remediation agent by using turmeric residue comprises the following steps:
s1, preprocessing the turmeric residue, cleaning the turmeric residue to remove impurities in the turmeric residue, drying, crushing and sieving the cleaned turmeric residue;
s2, pyrolyzing and carbonizing the turmeric slag, namely heating the pretreated turmeric slag in a tube furnace at a heating rate of 10 ℃/min, keeping the temperature for 1h for pyrolyzing and carbonizing when a sample is heated to 600 ℃, cooling to room temperature after pyrolysis is finished, and taking out;
s3, dipping the turmeric slag, namely dipping the pyrolytic carbonized turmeric slag in ferric chloride solution with the concentration of 0.1mol/L, wherein the dipping ratio is that the mass ratio of the turmeric slag to the ferric chloride solution is 1.5: 1;
s4, modifying the turmeric residue, namely placing the soaked turmeric residue in an oscillating box to oscillate for 3 hours to modify the turmeric residue;
s5, drying the turmeric residue, namely drying the modified turmeric residue at the drying temperature of 60 ℃, wherein the water content of the dried turmeric residue is 10 percent, and thus obtaining the soil remediation agent.
Comparative example 3
(1) Anaerobic fermentation is carried out to produce organic acid, and the steps are as follows:
s1, pretreating turmeric residue, namely cleaning the turmeric residue with clear water, removing impurities, drying until the water content is 10%, crushing, passing through a 60-mesh sieve, and taking undersize for later use;
s2, carrying out enzymolysis on the turmeric residue, adjusting the water content of the pretreated turmeric residue to 55%, adding a mixed fermentation microbial inoculum according to the addition proportion of 1%, wherein the mixed fermentation microbial inoculum comprises bacillus subtilis, saccharomycetes, Aspergillus niger and Trichoderma harzianum, and carrying out aerobic fermentation for 7 d;
s3, fermenting the turmeric dregs, mixing the enzymatically hydrolyzed turmeric dregs and domesticated anaerobic sludge according to a ratio of 6:1, placing the mixture in a sealed container for anaerobic fermentation for 12 days, and keeping the fermentation temperature at 37 ℃ in the fermentation process;
s4, drying the turmeric residue, drying the fermentation product obtained in the step S3, controlling the water content to be 20% and the drying temperature to be 55 ℃, and obtaining the organic matrix containing the organic acid.
(2) The preparation method of the iron-based modified activated carbon comprises the following steps:
s1, preprocessing the turmeric residue, cleaning the turmeric residue to remove impurities in the turmeric residue, drying, crushing and sieving the cleaned turmeric residue;
s2, pyrolyzing and carbonizing the turmeric slag, namely heating the pretreated turmeric slag in a tube furnace at a heating rate of 10 ℃/min, keeping the temperature for 1h for pyrolyzing and carbonizing when a sample is heated to 600 ℃, cooling to room temperature after pyrolysis is finished, and taking out;
s3, dipping the turmeric slag, namely dipping the pyrolytic carbonized turmeric slag in ferric chloride solution with the concentration of 0.1mol/L, wherein the dipping ratio is that the mass ratio of the turmeric slag to the ferric chloride solution is 1.5: 1;
s4, modifying the turmeric residue, namely placing the soaked turmeric residue in an oscillating box to oscillate for 3 hours to modify the turmeric residue;
s5, drying the turmeric slag, drying the modified turmeric slag at the drying temperature of 60 ℃, wherein the water content of the dried turmeric slag is 10 percent, and obtaining the iron-based modified activated carbon.
(3) Mixing materials:
and (3) fully and uniformly mixing the organic matrix containing the organic acid and the iron-based modified activated carbon according to the proportion of 7:1 to obtain the soil remediation agent.
Experimental example 1
Carrying out a potting experiment on the soil remediation agent prepared by the process methods of the examples 1-3 and the comparative examples 1-3, adding an exogenous potassium chromate solution into soil in a potting experiment, adjusting the total chromium content to be 20mg/kg, setting a control group and an experimental group, carrying out no other treatment on the control group, respectively mixing the experimental groups 1-6 according to the weight ratio of the soil to the remediation agent 6:1, after stabilizing for 7d, transplanting Chinese cabbages with consistent growth and size, cultivating for 45d, harvesting the Chinese cabbages, and respectively measuring the content of residual chromium in the soil and the total chromium content in the Chinese cabbages, wherein the results are as follows:
TABLE 1 chromium content in soil in residue form (mg/kg)
TABLE 2 Total chromium content (mg/kg) in cabbage
As can be seen from tables 1 and 2, the soil remediation agents prepared by the methods of examples 1 to 3 and comparative examples 1 to 3 have obvious remediation effects on soil, obviously improve the content of residual chromium in the soil, and reduce the total chromium content in the Chinese cabbage, wherein the soil remediation agents prepared by the methods of examples 1 to 3 have more obvious effects, can fix the chromium in the chromium-polluted soil, reduce the absorption of chromium by crops, reduce the harm and perform in-situ remediation on the soil.
Experimental example 2
Preparing a solution with a chromium content of 50mg/L by using potassium chromate, subpackaging the solution into triangular flasks, treating 100mL of each solution, setting a control group and experimental groups 1-6, adding 10mL of purified water into the control group, respectively adding 10g of the repairing agent prepared by the methods of examples 1-3 and comparative examples 1-3 into the experimental groups 1-6, standing the repairing agent for 24 hours at normal temperature, and then detecting the hexavalent chromium content in the solution, wherein the results are as follows:
TABLE 3 hexavalent chromium content (mg/kg) in the different treatments
As can be seen from Table 3, the soil remediation agent prepared by the method of examples 1-3 is added into the hexavalent chromium solution for standing reaction, so that the content of hexavalent chromium can be obviously reduced, the chromium can be reduced, and the toxicity of the chromium can be reduced.
In summary, the soil remediation agent prepared by the method in the embodiment 1-3 can rapidly reduce hexavalent chromium, convert chromium in soil into a residue state for fixation, thereby reducing chromium absorption of crops, reducing the harm of chromium-contaminated soil, and performing in-situ remediation on soil, wherein the soil remediation agent prepared by the method in the embodiment 3 has more obvious effect, and is the best embodiment of the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A process method for producing a soil remediation agent by using turmeric residue is characterized by comprising the following steps:
cleaning and removing impurities from turmeric residue, drying, crushing, sieving, performing anaerobic fermentation on one part of turmeric residue to generate organic acid, preparing the other part of turmeric residue into biochar, soaking in ferric chloride solution for modification, activating to prepare iron-based modified activated carbon, and mixing the anaerobic fermentation product with the iron-based modified activated carbon by a mixing ratio of 4-6:1 for repairing chromium-contaminated soil;
the method for producing the organic acid by anaerobic fermentation comprises the following steps:
s1, pretreating turmeric residue, namely cleaning the turmeric residue with clear water, removing impurities, drying until the moisture content is 8-15%, crushing, passing through a 60-mesh sieve, and taking undersize for later use;
s2, carrying out enzymolysis on the turmeric residue, adjusting the water content of the pretreated turmeric residue to 50% -65%, adding a mixed fermentation microbial inoculum according to the addition proportion of 0.1% -1%, wherein the mixed fermentation microbial inoculum comprises bacillus subtilis, saccharomycetes, Aspergillus niger and Trichoderma harzianum, and carrying out aerobic fermentation for 3-7 d;
s3, fermenting the turmeric dregs, namely mixing the enzymatically hydrolyzed turmeric dregs and the domesticated anaerobic sludge according to the ratio of 6:1, mixing, placing in a sealed container for anaerobic fermentation for 10-15 days, and keeping the fermentation temperature at 30-40 ℃ in the fermentation process;
s4, drying the turmeric residue, namely drying the fermentation product obtained in the step S3, controlling the water content to be 15-25% and the drying temperature to be 40-70 ℃, so as to obtain an organic matrix containing organic acid;
the preparation method of the iron-based modified activated carbon comprises the following steps:
s1, preprocessing the turmeric residue, cleaning the turmeric residue to remove impurities in the turmeric residue, drying, crushing and sieving the cleaned turmeric residue;
s2, pyrolyzing and carbonizing the turmeric slag, namely heating the pretreated turmeric slag in a tube furnace at the heating rate of 5-15 ℃/min, maintaining the temperature for 0.5-1.5h for pyrolyzing and carbonizing when the sample is heated to 550-650 ℃, and cooling to room temperature after pyrolysis is finished and taking out;
s3, dipping the turmeric slag, namely dipping the turmeric slag subjected to pyrolysis carbonization in ferric chloride solution with the concentration of 0.05-0.15mol/L, wherein the dipping ratio is that the mass ratio of the turmeric slag to the ferric chloride solution is 1-2: 1;
s4, modifying the turmeric residue, namely placing the soaked turmeric residue in an oscillating box to oscillate for 2-5h, and modifying the turmeric residue;
s5, drying the turmeric slag, drying the modified turmeric slag at the temperature of 50-80 ℃, wherein the water content of the dried turmeric slag is 5% -15%, and obtaining the iron-based modified activated carbon.
2. The process for producing soil remediation agent by using turmeric residue according to claim 1, wherein in step S2 of said method for producing organic acid by anaerobic fermentation, all of bacillus subtilis, yeast, aspergillus niger and trichoderma harzianum are commercially available raw bacterial powder products, the number of effective viable bacteria is 100 hundred million cfu/g, and the mixing ratio of the four bacterial agents in step S2 is bacillus subtilis: yeast: aspergillus niger: trichoderma harzianum 2:0.5:0.3: 0.2.
3. the method for producing soil remediation agent as claimed in claim 1, wherein the temperature during anaerobic fermentation is 37 ℃ in step S3.
4. The process for producing soil remediation agent as claimed in claim 1, wherein the drying temperature in step S4 of the method for producing organic acid by anaerobic fermentation is 55 ℃.
5. The process for producing soil remediation agent using turmeric slag as claimed in claim 1, wherein in step S3 of said iron-based modified activated carbon preparation method, the concentration of ferric chloride solution is 0.1mol/L, and the dipping ratio is turmeric slag: ferric chloride solution ═ 1.5: 1.
6. the process for producing soil remediation agent as claimed in claim 1, wherein the iron-based modified activated carbon is prepared by shaking for 3h in step S5.
7. The process for producing soil remediation agent using turmeric slag as claimed in claim 1, wherein in step S6, the drying temperature is 60 ℃.
8. The process for producing soil remediation agent using turmeric residue according to claim 1, wherein the iron-based modified activated carbon is prepared by mixing organic acid and iron-based modified activated carbon at a ratio of 5: 1.
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