CN110964536B - Iron-based soil remediation agent and preparation method thereof - Google Patents
Iron-based soil remediation agent and preparation method thereof Download PDFInfo
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Abstract
The invention provides an iron-based soil remediation agent and a preparation method thereof, wherein the iron-based soil remediation agent is prepared by uniformly spraying a gold bacteria stock solution on biogas residues mixed with oxalic acid, straw powder and pig manure, compacting, stacking, sealing and fermenting to obtain odorless biogas residues, mixing and drying an iron salt, a calcium salt and biochar, and extruding and crushing the odorless biogas residues, polyacrylic acid and manganese dioxide by a screw. The soil remediation agent provided by the invention has good adsorption performance, can form arsenic in soil into Fe-As and Ca-As complexes, simultaneously contains rich organic humus, can convert the arsenic complexes and the arsenic adsorbed by the soil into effective arsenic, effectively reduces the arsenic content in the soil, has a good remediation effect on the arsenic-polluted soil, is simple in preparation process, low in cost, renewable in raw materials, and has the characteristics of good environmental friendliness and the like.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to an iron-based soil remediation agent and a preparation method thereof.
Background
Arsenic (As) is an S-philic element, and exists As arsenite in the earth crust or accompanies sulfides such As Cu, Pb, Zn, and the like. As is widely used in many industries, the As is largely left in the soil through the processes of mining, processing, using, abandoning and the like, so that the As pollution in the soil is ubiquitous worldwide. With the development of industry and agriculture and the continuous application of arsenic-containing chemicals, arsenic pollution has become a serious problem worldwide. Arsenic contamination of soil, atmosphere and water is also posing a threat to crop production and human health. Therefore, research on arsenic pollution and remediation technology has important practical significance, and reduction or elimination of pollution and toxicity of arsenic is an important subject to be solved urgently.
At present, the remediation technology aiming at the arsenic pollution of soil mainly comprises an engineering measure method, a physical and chemical method, a microbiological method, a plant remediation method, an animal remediation method and the like. Wherein, the engineering measures mainly comprise soil dressing, soil replacement, deep ploughing and soil turning and the like; the physical and chemical remediation mainly comprises a soil leaching method, a vitrification method, an electrochemical method and the like; the microbiological method mainly utilizes the extremely strong adaptability of the microorganisms to arsenic, and takes the arsenic as a growth energy source; the plant restoration can be divided into plant extraction, plant fixation, plant volatilization, root system filtration and plant degradation according to the restoration mechanism and process; the animal repairing method mainly utilizes certain lower animals in the soil, such as earthworms, rats and the like, to absorb the heavy metals in the soil, thereby reducing the content of the heavy metals in the polluted soil.
At present, the technology is a solidification and stabilization repairing technology which is used for more arsenic-containing solid wastes, changes the existing form of arsenic in soil by adding a solidification and stabilization medicament into the soil, reduces the mobility and bioavailability of the arsenic in the soil, and is an effective soil repairing technology. The key of the technology is to find and prepare cheap and efficient repair materials, and currently, iron salts, magnesium salts, calcium salts, barium salts, organic complexing agents and the like become the hottest research objects for removing arsenic. Meanwhile, the leaching remediation technology has very important significance for fundamentally removing arsenic in soil. In recent years, research on remediation technologies of novel arsenic-contaminated soil has attracted much attention.
The Chinese patent application No. 201510996083.9 discloses a method for repairing arsenic-contaminated soil, which comprises the following steps: (1) activation treatment: adding an activating agent into the arsenic-polluted soil, uniformly stirring, and reacting; (2) oxidation treatment: adding manganese dioxide into the arsenic-polluted soil subjected to the activation treatment in the step (1), uniformly stirring, and carrying out oxidation reaction; (3) and (3) stabilizing treatment: adding a stabilizer into the arsenic-polluted soil oxidized in the step (2), uniformly stirring, and standing; (4) acid-base regulation: adding plant ash into the arsenic-polluted soil subjected to the stabilizing treatment in the step (3), adjusting the water content of the soil, uniformly stirring, and naturally culturing; according to the method, the arsenic adsorbed by the soil is replaced by adding an activating agent into the soil, and then the exchanged arsenic is fixed by adding a stabilizing agent of an oxidizing agent; as the water-soluble activating agent can activate arsenic in soil in a large range, part of arsenic is still in a free state after the solid stabilizing agent is added, and serious pollution to deep soil and underground water can be caused. The Chinese patent application No. 201910027228.2 discloses a modified biochar for repairing arsenic-containing polluted soil, a preparation method and application thereof, wherein the preparation method of the modified biochar comprises the following steps: (1) acid modification: preparing a slurry A from the biochar and tap water at normal temperature, and adding sulfuric acid and hydrochloric acid for acid modification; (2) combined modification: washing residual acid from the product obtained by acid modification, preparing slurry B, adding ferric salt, hydrogen peroxide and polyacrylamide, and fully stirring for reaction; the modified biochar disclosed by the invention is small in addition amount in the arsenic-polluted soil remediation process, strong in affinity to soil, better in arsenic pollution degradation effect and free of secondary pollution. The invention mainly fixes water-soluble arsenic in soil, and can not play a role in adsorbing the arsenic adsorbed by the soil, so that the adsorption effect is limited.
In order to effectively solve the problem of arsenic-contaminated soil, a novel arsenic-contaminated soil remediation agent is needed, so that the purposes of simple process, low cost, environmental friendliness and efficient remediation of arsenic-contaminated soil are effectively achieved.
Disclosure of Invention
Aiming at the problem that the existing arsenic pollution in soil is difficult to repair, the invention provides an iron-based soil repairing agent and a preparation method thereof, so that the high-efficiency arsenic-polluted soil repairing agent which is simple in preparation process, low in cost, renewable in raw materials and good in environment friendliness is obtained.
In order to solve the problems, the invention adopts the following technical scheme:
an iron-based soil remediation agent is prepared by uniformly spraying a gold bacteria stock solution on biogas residues mixed with oxalic acid, straw powder and pig manure, compacting, stacking, sealing, fermenting to obtain odorless biogas residues, mixing and drying an iron salt, a calcium salt and biochar, mixing with the odorless biogas residues, polyacrylic acid and manganese dioxide, and extruding and crushing by a screw rod.
Preferably, the straw powder is one or a combination of more than two of corn straw powder, soybean straw powder and rice straw powder.
Preferably, the iron salt is one or a combination of two of ferric chloride and ferric nitrate.
Preferably, the calcium salt is one or a combination of two of calcium chloride and calcium nitrate.
The invention also provides a preparation method of the iron-based soil remediation agent, which comprises the following specific steps:
(1) adding straw powder, pig manure and oxalic acid into biogas residues with the water content of 50-60%, uniformly mixing to obtain a mixture, diluting a gold bacterium stock solution by 120 times, uniformly spraying the diluted gold bacterium stock solution on the mixture, compacting, stacking, sealing and fermenting for 7-15 days to obtain odorless biogas residues;
(2) adding iron salt and calcium salt into water, continuously adding the biochar after the iron salt and the calcium salt are fully dissolved, then quickly stirring at the rotating speed of 500-600rpm for 30-50min, then ultrasonically dispersing for 0.5-1h, and drying by using a rotary flash evaporation dryer to obtain the iron-calcium loaded biochar;
(3) adding iron-calcium loaded biochar, polyacrylic acid and manganese dioxide into the prepared odorless biogas residue, and then extruding and crushing by a screw rod to obtain the iron-calcium biogas residue soil remediation agent, namely the iron-based soil remediation agent.
Preferably, in the preparation of the odorless biogas residue in the step (1), the mass ratio of the biogas residue, the straw powder, the pig manure, the oxalic acid and the golden fungus stock solution is 40-60:10-20:10-20:5-10: 3-6.
Preferably, the hot air inlet temperature of the spin flash drying in the step (2) is 250-350 ℃, the hot air outlet temperature is 100-150 ℃, and the air volume is 2000-3000m3/h。
Preferably, in the preparation of the iron-calcium loaded biochar in the step (2), the mass ratio of the iron salt to the calcium salt to the water to the biochar is 10-15:5-10:60-100: 20-30.
Preferably, the screw diameter of the screw extruder in the step (3) is 20-40mm, the length-diameter ratio of the screw is 10-15:1, and the rotating speed of the screw is 20-40 rpm.
Preferably, in the step (3), the mass ratio of the odorless biogas residue, the iron-calcium loaded biochar, the polyacrylic acid and the manganese dioxide is 40-50:15-20:5-10: 3-6.
It is known that for arsenic pollution in soil, microorganisms participate in various links of arsenic circulation in the environment, such as interconversion of arsenic in soil/water, migration of arsenic from the surface to the ground and water, gaseous arsenic generated by biological methylation, and adsorption and immobilization of arsenic by microorganisms. Although arsenic is toxic to human bodies, microorganisms have extremely strong adaptability to arsenic, and even some microorganisms use arsenic as an energy source for growth. There are three modes of resistance of microorganisms to arsenic and the metabolic system: one is that the most widespread arsenic is present in the genomes and plasmids of most bacteria; the second is the recently discovered arr gene, which is the As (V) reductase of the periplasmic region, which functions in anaerobic respiration with As (V) As the terminal electron acceptor; and the aso gene encodes periplasm As (III) oxidase, which plays a role in resisting As (III) in an aerobic environment, so that the As (III) becomes an electron donor and is converted into low-toxicity As (V). In view of these three modes, arsenic-resistant bacteria can be screened from environments contaminated with or not contaminated with arsenic, adsorbing and detoxifying arsenic from the environment. The biogas residues are used As solid substances left after organic substance fermentation, the biogas residues are rich in organic matters, humic acid, trace nutrient elements, various amino acids, enzymes, beneficial microorganisms and the like, and can play a good role in improving soil; the oxalic acid also has the purpose of washing and repairing arsenic pollution in soil.
Furthermore, the iron salt, the calcium salt and the biochar are used as raw materials to prepare the iron-calcium loaded biochar, wherein the biochar with a porous structure can adsorb arsenic in soil, the iron salt and the calcium salt can react with the arsenic to realize iron salt-calcium salt combined precipitation, so that the mobility and the bioavailability of the arsenic in the soil can be effectively reduced, and the method is an effective method for removing the arsenic in the soil.
Furthermore, the invention mixes the odorless biogas residue, the iron-calcium loaded biochar, the polyacrylic acid and the manganese dioxide to prepare the iron-calcium biogas residue soil remediation agent. Wherein, manganese dioxide can oxidize As (III) into As (V), and can form stable Fe-As and Ca-As complexes with iron salt and calcium salt, thereby being convenient for organic humus to convert the complex into effective arsenic and achieving the aim of repairing arsenic-polluted soil; meanwhile, the iron-calcium salt is loaded on the biochar, and then the polyacrylic acid is added, so that the biochar can be bonded with odorless biogas residues, the loss of the effective repairing agent in soil can be avoided, and the durability of the effect of the soil repairing agent is ensured.
The problem that the existing arsenic pollution in soil is difficult to restore is solved. In view of the above, the invention provides an iron-based soil remediation agent and a preparation method thereof, wherein biogas residues are added with straw powder, pig manure and oxalic acid and mixed uniformly, a gold bacterium stock solution is diluted and then added into the mixture uniformly, and the mixture is compacted, stacked, sealed and fermented to obtain odorless biogas residues; adding iron salt and calcium salt into water, dissolving, continuously adding biochar, quickly stirring and dispersing, ultrasonically treating, and drying by using a rotary flash evaporation dryer to obtain iron-calcium loaded biochar; weighing odorless biogas residue, adding iron-calcium loaded biochar, polyacrylic acid and manganese dioxide, extruding and mixing through a screw extruder, drying, crushing and sieving to obtain the iron-calcium biogas residue soil remediation agent. The soil remediation agent provided by the invention has good adsorption performance, can form arsenic in soil into Fe-As and Ca-As complexes, simultaneously contains rich organic humus, can convert the arsenic complexes and the arsenic adsorbed by the soil into effective arsenic, effectively reduces the arsenic content in the soil, has good remediation effect on the arsenic-polluted soil, has the characteristics of simple preparation process, low cost, renewable raw materials, good environmental friendliness and the like.
Compared with the prior art, the invention provides an iron-based soil remediation agent and a preparation method thereof, and the iron-based soil remediation agent has the outstanding characteristics and excellent effects that:
1. the soil remediation agent prepared by the invention has good remediation effect on arsenic-contaminated soil, is simple in preparation process, low in cost, renewable in raw materials, and has the characteristics of good environmental friendliness and the like.
2. According to the invention, the biogas residues after the mixed fermentation of oxalic acid are added contain rich organic humus components, Mg-As and Al-As complexes in soil and arsenic adsorbed by the soil are converted into effective arsenic, and meanwhile, organic acid and ferric salt in the soil form a polyhedral structure, so that the adsorption sites of the arsenic are increased, and the fixing capacity of the ferric salt to the arsenic in the soil is improved.
3. The invention oxidizes As (III) into As (V) by manganese dioxide, and can form stable Fe-As and Ca-As complexes with iron salt and calcium salt, thereby achieving the purpose of restoring arsenic-polluted soil.
4. According to the invention, the iron-calcium salt is loaded on the biochar, and then the polyacrylic acid is added to bond the biochar with odorless biogas residues, so that the loss of the repairing agent in soil can be avoided, and meanwhile, the porous structure of the biochar also has an adsorption effect on arsenic in the soil.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Adding 10kg of corn straw powder, 10kg of pig manure and 5kg of oxalic acid into 40kg of biogas residues with water content of 50%, uniformly mixing to obtain a mixture, then diluting 3kg of a gold bacterium stock solution by 100 times, uniformly spraying the diluted gold bacterium stock solution on the mixture, compacting, stacking, sealing and fermenting for 7 days to obtain odorless biogas residues;
(2) adding 10kg of ferric chloride and 5kg of calcium nitrate into 60kg of water, continuously adding 20kg of biochar after fully dissolving, then rapidly stirring for 50min at the rotating speed of 500rpm, then ultrasonically dispersing for 1h, and drying by using a rotary flash evaporation dryer to obtain the iron-calcium loaded biochar; the hot air inlet temperature of the spin flash drying is 250 ℃, the hot air outlet temperature is 100 ℃, and the air quantity is 2000m3/h ；
(3) Adding 15kg of iron-calcium loaded biochar, 5kg of polyacrylic acid and 3kg of manganese dioxide into 40kg of prepared odorless biogas residue, and then extruding and crushing by a screw rod to obtain an iron-calcium biogas residue soil repairing agent, namely an iron-based soil repairing agent; the diameter of a screw of the screw extruder is 20mm, the length-diameter ratio of the screw is 10:1, and the rotating speed of the screw is 20 rpm.
Example 2
(1) Adding 20kg of soybean straw powder, 20kg of pig manure and 10kg of oxalic acid into 60kg of biogas residues with water content of 60%, uniformly mixing to obtain a mixture, then diluting 6kg of a golden fungus stock solution by 120 times, uniformly spraying the diluted golden fungus stock solution on the mixture, compacting, stacking, sealing and fermenting for 15 days to obtain odorless biogas residues;
(2) adding 15kg of ferric nitrate and 10kg of calcium chloride into 100kg of water, continuously adding 30kg of biochar after fully dissolving, then rapidly stirring for 30min at the rotating speed of 600rpm, then ultrasonically dispersing for 1h, and drying by using a rotary flash evaporation dryer to obtain the iron-calcium loaded biochar; the hot air inlet temperature of the spin flash drying is 350 ℃, the hot air outlet temperature is 150 ℃, and the air volume is 3000m3/h ；
(3) Adding 20kg of iron-calcium loaded biochar, 10kg of polyacrylic acid and 6kg of manganese dioxide into 50kg of prepared odorless biogas residue, and then extruding and crushing by a screw rod to obtain an iron-calcium biogas residue soil repairing agent, namely an iron-based soil repairing agent; the diameter of a screw of the screw extruder is 40mm, the length-diameter ratio of the screw is 15:1, and the rotating speed of the screw is 30 rpm.
Example 3
(1) Adding 13kg of rice straw powder, 13kg of pig manure and 7kg of oxalic acid into 45kg of biogas residue with water content of 52%, uniformly mixing to obtain a mixture, diluting 4kg of a stock solution of gold bacteria by 105 times, uniformly spraying the diluted stock solution on the mixture, compacting, stacking, sealing and fermenting for 23 days to obtain odorless biogas residue
(2) Adding 12kg of ferric chloride and 7kg of calcium chloride into 90kg of water, continuously adding 23kg of biochar after fully dissolving, then rapidly stirring for 45min at the rotating speed of 520rpm, then ultrasonically dispersing for 1h, and drying by using a rotary flash evaporation dryer to obtain the iron-calcium loaded biochar; the hot air inlet temperature of the spin flash drying is 280 ℃, the hot air outlet temperature is 120 ℃, and the air quantity is 2200m3/h ；
(3) Adding 17kg of iron-calcium loaded biochar, 7kg of polyacrylic acid and 5kg of manganese dioxide into 43kg of prepared odorless biogas residue, and then extruding and crushing by a screw rod to obtain an iron-calcium biogas residue soil repairing agent, namely an iron-based soil repairing agent; the screw diameter of the screw extruder is 25mm, the length-diameter ratio of the screw is 11:1, and the rotation speed of the screw is 22 rpm.
Example 4
(1) Adding 18kg of corn straw powder, 18kg of pig manure and 8kg of oxalic acid into 55kg of biogas residues with the water content of 58%, uniformly mixing to obtain a mixture, then diluting 4kg of a golden fungus stock solution by 115 times, uniformly spraying the diluted golden fungus stock solution on the mixture, compacting, stacking, sealing and fermenting for 9 days to obtain odorless biogas residues;
(2) adding 14kg of ferric nitrate and 9kg of calcium nitrate into 70kg of water, continuously adding 28kg of biochar after fully dissolving, then rapidly stirring for 35min at the rotating speed of 580rpm, then ultrasonically dispersing for 0.5h, and drying by using a rotary flash evaporation dryer to obtain iron-calcium loaded biochar; the hot air inlet temperature of the spin flash drying is 320 ℃, the hot air outlet temperature is 140 ℃, and the air quantity is 2800m3/h ；
(3) Adding 18kg of iron-calcium loaded biochar, 8kg of polyacrylic acid and 3kg of manganese dioxide into 48kg of prepared odorless biogas residue, and then extruding and crushing by a screw rod to obtain an iron-calcium biogas residue soil repairing agent, namely an iron-based soil repairing agent; the screw diameter of the screw extruder is 35mm, the length-diameter ratio of the screw is 14:1, and the rotation speed of the screw is 28 rpm.
Example 5
(1) Adding 15kg of soybean straw powder, 15kg of pig manure and 8kg of oxalic acid into 50kg of biogas residues with the water content of 55%, uniformly mixing to obtain a mixture, then diluting 5kg of a golden fungus stock solution by 110 times, uniformly spraying the diluted golden fungus stock solution on the mixture, compacting, stacking, sealing and fermenting for 12 days to obtain odorless biogas residues;
(2) adding 12kg of ferric nitrate and 8kg of calcium chloride into 80kg of water, continuously adding 25kg of biochar after fully dissolving, then rapidly stirring for 40min at the rotating speed of 550rpm, then ultrasonically dispersing for 1h, and drying by using a rotary flash evaporation dryer to obtain the iron-calcium loaded biochar; the hot air inlet temperature of the spin flash drying is 300 ℃, the hot air outlet temperature is 125 ℃, and the air quantity is 2500m3/h ；
(3) Adding 18kg of iron-calcium loaded biochar, 8kg of polyacrylic acid and 5kg of manganese dioxide into 45kg of prepared odorless biogas residue, and then extruding and crushing by a screw rod to obtain an iron-calcium biogas residue soil repairing agent, namely an iron-based soil repairing agent; the screw diameter of the screw extruder is 30mm, the length-diameter ratio of the screw is 12:1, and the rotating speed of the screw is 25 rpm.
Comparative example 1
Adding 15kg of iron-calcium loaded biochar, 5kg of polyacrylic acid and 3kg of manganese dioxide into 20kg of the odorless biogas residue prepared in example 1, and then extruding and crushing by a screw rod to obtain the iron-calcium biogas residue soil repairing agent, namely the iron-based soil repairing agent.
Comparative example 1 the amount of odorless biogas residue was greatly reduced.
Comparative example 2
Adding 5kg of iron-calcium loaded biochar, 5kg of polyacrylic acid and 3kg of manganese dioxide into 40kg of the odorless biogas residue prepared in example 1, and then extruding and crushing by a screw rod to obtain the iron-calcium biogas residue soil repairing agent, namely the iron-based soil repairing agent.
Comparative example 2 the amount of iron calcium loaded biochar was reduced.
Comparative example 3
Adding 15kg of iron-calcium loaded biochar, 5kg of polyacrylic acid and 0.5kg of manganese dioxide into 40kg of the odorless biogas residue prepared in example 1, and then extruding and crushing by a screw rod to obtain the iron-calcium biogas residue soil repairing agent, namely the iron-based soil repairing agent.
Comparative example 3 the amount of manganese dioxide used was greatly reduced.
The test method comprises the following steps:
the contaminated soil with the soil pH of 7.8 and the arsenic leaching concentration of 5.7mkg/L was used as an experimental object, the soil remediation agents prepared in the comparative examples and the examples were added to the soil in an amount of 1.0% of the mass of the arsenic-containing soil, the soil was stirred uniformly, water was added to the soil in an amount of 30% of the mass of the soil, after natural cultivation for 15 days, the leaching concentration of arsenic extracted from the soil by the solid waste leaching toxicity leaching method, the sulfuric acid-nitric method (HJT 299-2007) was used, and the analysis results are shown in Table 1.
Table 1:
| performance index | Concentration of arsenic leached from soil (mg/L) | Arsenic removal Rate (%) |
| Example 1 | 0.6 | 89.5 |
| Example 2 | 0.4 | 90.6 |
| Example 3 | 0.7 | 89.6 |
| Example 4 | 0.6 | 90.3 |
| Example 5 | 0.5 | 89.8 |
| Comparative example 1 | 1.5 | 73.7 |
| Comparative example 2 | 1.2 | 78.9 |
| Comparative example 3 | 1.0 | 82.4 |
As can be seen from Table 1, the untreated soil had a pH of 7.8 and the arsenic leaching concentration in the soil was 5.7 mg/L. According to the analysis results of the comparative examples 1, 2, 3 and the examples after the arsenic-polluted soil is repaired, the odorless biogas residues play a synergistic role in stabilizing arsenic in the soil by iron and calcium salts, and the repairing agent obtained by compounding the fermented odorless biogas residues and the iron and calcium salts is more beneficial to solidification and stabilization of arsenic in the soil.
Claims (9)
1. An iron-based soil remediation agent is characterized in that a gold-bacteria stock solution is uniformly sprayed on biogas residues mixed with oxalic acid, straw powder and pig manure, then the biogas residues are compacted, stacked, sealed and fermented to obtain odorless biogas residues, then iron salt, calcium salt and biochar are mixed and dried to obtain iron-calcium-loaded biochar, and then the iron-calcium-loaded biochar is mixed with the odorless biogas residues, polyacrylic acid and manganese dioxide and then is extruded and crushed by a screw rod to obtain the iron-based soil remediation agent; the mass ratio of the odorless biogas residues to the iron-calcium loaded biochar to the polyacrylic acid to the manganese dioxide is 40-50:15-20:5-10: 3-6.
2. The iron-based soil remediation agent of claim 1, wherein said straw powder is one or a combination of more than two of corn straw powder, soybean straw powder, and rice straw powder.
3. The iron-based soil remediation agent of claim 1, wherein said iron salt is one or a combination of ferric chloride and ferric nitrate.
4. The iron-based soil remediation agent of claim 1, wherein said calcium salt is one or a combination of calcium chloride and calcium nitrate.
5. The method of any one of claims 1-4 for the preparation of an iron-based soil remediation agent, wherein the method comprises the steps of:
(1) adding straw powder, pig manure and oxalic acid into biogas residues with the water content of 50-60%, uniformly mixing to obtain a mixture, diluting a gold bacterium stock solution by 120 times, uniformly spraying the diluted gold bacterium stock solution on the mixture, compacting, stacking, sealing and fermenting for 7-15 days to obtain odorless biogas residues;
(2) adding iron salt and calcium salt into water, continuously adding the biochar after the iron salt and the calcium salt are fully dissolved, then quickly stirring at the rotating speed of 500-600rpm for 30-50min, then ultrasonically dispersing for 0.5-1h, and drying by using a rotary flash evaporation dryer to obtain the iron-calcium loaded biochar;
(3) adding iron-calcium loaded biochar, polyacrylic acid and manganese dioxide into the prepared odorless biogas residue, and then extruding and crushing by a screw rod to obtain the iron-calcium biogas residue soil remediation agent, namely the iron-based soil remediation agent.
6. The method for preparing an iron-based soil remediation agent as claimed in claim 5, wherein in the preparation of the odorless biogas residue in step (1), the mass ratio of the biogas residue, the straw powder, the pig manure, the oxalic acid, such as a gold bacteria stock solution is 40-60:10-20:10-20:5-10: 3-6.
7. The method for preparing an iron-based soil remediation agent as claimed in claim 5, wherein the hot air inlet temperature of the spin flash drying in step (2) is 250-350 ℃, the hot air outlet temperature is 100-150 ℃, and the air volume is 2000-3000m3/h。
8. The method for preparing an iron-based soil remediation agent of claim 5, wherein in the step (2), the iron salt, the calcium salt, the water and the biochar are prepared in a mass ratio of 10-15:5-10:60-100: 20-30.
9. The method of claim 5, wherein in step (3), the screw diameter of the screw extruder is 20-40mm, the length-diameter ratio of the screw is 10-15:1, and the rotation speed of the screw is 20-40 rpm.
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