CN112676331A - Method for restoring organic contaminated soil through chemical-microbial cooperation - Google Patents
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Abstract
The invention provides a method for restoring organic contaminated soil through chemical-microbial synergy4Mixing and stirring uniformly, then spraying a proper amount of water, covering a plastic film, discharging and stacking, namely completing soil remediation and returning the soil to the field directly; the activated bacterium powder is prepared by crushing straws and vermiculite, mixing and stirring the crushed straws and vermiculite with farm manure, then adding biomass charcoal and organic acid, then adding composite bacterium liquid and water, uniformly stirring, and stacking. The method provided by the invention realizes the purposes of effective synergy of chemistry and microorganism and high-efficiency remediation of organic contaminated soil, and is suitable for soil remediationHas important significance to the agricultural development.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a method for remedying organic contaminated soil through chemical-microbial cooperation.
Background
With the development of modern industry, the combustion of fossil fuels, the leakage of petroleum, the stacking of agricultural and industrial solid wastes such as industrial sewage and sludge and the wide use of pesticides, organic pollutants such as phthalate, polycyclic aromatic hydrocarbons, organic chlorine, organic phosphorus pesticides and the like directly or indirectly enter the soil environment, and the organic pollutants are easy to be adsorbed by soil particles due to fat solubility and remain in the soil for a long time. Some of the organic matters are carcinogenic, teratogenic or mutagenic substances, and the organic matters can not only reduce the yield of crops and even stop the crop harvest, but also enter a food chain through plants or animals, thereby bringing serious influence on the survival and health of the human beings. Therefore, the research on the remediation and the treatment of the organic pollutants in the soil are hot spots of the current environmental protection research at home and abroad.
At present, 3 types of engineering physical remediation, chemical remediation and biological remediation are mainly adopted for remediating the organic contaminated soil. Physical remediation is the removal of contaminants from contaminated soil by heating, separation, etc.; such as soil steam leaching, microwave heating, thermal desorption and other technologies; the technology has high equipment cost, needs more energy consumption and limits the use. The chemical restoration mainly comprises an incineration method, a vacuum separation method, a steam stripping method, a chemical cleaning method (a surfactant cleaning method, an organic solvent cleaning method and a supercritical water steam extraction method), a photochemical degradation method and a chemical grid prevention and control method; however, chemical remediation methods tend to be ineffective and may have some adverse effect on the soil. Microbial remediation is the decomposition of organic pollutants by means of metabolic decomposition of microorganisms, but for a longer time; a controlled or spontaneous process for the catalytic degradation of organic pollutants by means of organisms, in particular microorganisms, in order to restore the polluted environment or to eliminate the pollutants from the environment.
Recent research shows that the strong dechlorination of nanoscale powder zero-valent iron in chemical remediation technology can be accepted and applied to soil remediation. The microbial repairing technology utilizes microbes, indigenous bacteria, foreign bacteria and genetic engineering bacteria to metabolize pollutants to convert and degrade the pollutants, and can be well used for degrading organic pollutants in soil. Because a single repair method is often difficult to achieve a good repair effect, a mode of performing synergistic application on the existing repair technology becomes a good choice.
The Chinese patent application No. 202010634351.3 discloses a chemical oxidation remediation agent for organic contaminated soil, which comprises the following components in parts by weight: the using method of the chemical oxidation repair agent comprises the following steps: (1) crushing and screening the organic contaminated soil to obtain a pretreated soil sample; (2) mixing the pretreated soil sample with a chemical oxidation remediation agent, and uniformly stirring to obtain a mixed soil sample; (3) adding sufficient water into the original mixed soil sample, and uniformly stirring until water is separated out to obtain dosing slurry; (4) and (5) placing the medicine-added slurry in a dark place for maintenance. Chinese patent application No. 201810471932.2 discloses a conditioner for repairing organic contaminated soil by using microorganisms, which comprises the following components in percentage by mass: 5-20% of microbial flora fermentation liquid; 20-50% of an organic modifier; 30-75% of culture medium; the microbial flora relates to 19 genera including Acinetobacter, Micrococcus, Bacillus, Candida, Trichoderma and Aspergillus; the organic modifier is one or more of diatomite, humus, straw, biochar, sawdust, bagasse and plant ash; the culture medium contains potassium dihydrogen phosphate, dipotassium hydrogen phosphate, ammonium sulfate, limestone and soybean meal.
In order to effectively exert the advantages of chemical remediation and biological remediation in soil remediation of organic pollutants, a novel chemical-microbial remediation method is needed, and the purpose of synergistically remedying the soil polluted by the organic pollutants is further achieved.
Disclosure of Invention
Aiming at the defect of low remediation efficiency of the existing organic contaminated soil adopting chemical remediation and microbial remediation technologies, the invention provides a method for remedying the organic contaminated soil by chemical-microbial cooperation, so that the remediation efficiency of the organic contaminated soil is effectively improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a chemical-microbe synergistic method for repairing the polluted organic soil includes such steps as breaking the polluted soil, sieving, mixing with iron salt,then adding activated bacterium powder and NaBH4Mixing and stirring uniformly, then spraying a proper amount of water, covering a plastic film, discharging and stacking, namely completing soil remediation and returning the soil to the field directly; the activated bacterium powder is prepared by crushing straws and vermiculite, mixing and stirring the crushed straws and vermiculite with farm manure, then adding biomass charcoal and organic acid, then adding composite bacterium liquid and water, uniformly stirring, and stacking, and the method specifically comprises the following steps:
(1) crushing straws and vermiculite into powder, mixing and stirring the powder with the manure residue of a farm, and then adding biomass charcoal and organic acid to obtain a mixed material;
(2) uniformly mixing the compound bacterial liquid and water to obtain mixed bacterial liquid, adding the mixed bacterial liquid into the mixed material, uniformly stirring, and then stacking to obtain activated bacterial powder;
(3) crushing the organic contaminated soil to be repaired by using a spiral stirrer, sieving, adding ferric salt, uniformly mixing, adding activated bacterium powder and NaBH4And uniformly mixing and stirring, spraying proper amount of water for moistening, simultaneously covering with a plastic film, discharging and stacking, and then completing soil remediation, and directly returning to the field, thereby realizing chemical-microbial synergistic remediation of organic contaminated soil.
Preferably, the straw is one or a combination of more than two of wheat straw, rice straw, corn straw, cassava straw, rape straw, cotton straw and sugarcane straw.
Preferably, the farm manure is one or a combination of more than two of pig farm manure, sheep farm manure and chicken farm manure.
Further preferably, the farm manure is pig farm manure.
Preferably, the organic acid is one or a combination of two or more of oxalic acid, acetic acid and citric acid.
Preferably, the compound bacterial liquid is EM bacterial liquid.
Preferably, the iron salt is one of ferric sulfate and ferric chloride.
Preferably, in the preparation of the mixed material in the step (1), the mass ratio of the straw to the vermiculite to the farm manure to the biomass charcoal to the organic acid is 100:10-15:50-60:3-8: 1-2.
Preferably, the amount of the compound bacterial liquid in the step (2) is 0.1-0.2% of the total mass of the mixture.
Preferably, in the preparation of the mixed bacterial liquid in the step (2), the mass ratio of the composite bacterial liquid to the water is 1-2: 10-20.
Preferably, the stacking treatment time in the step (2) is 3-5 d.
Preferably, the mesh number of the sieving in the step (3) is 50 meshes.
Preferably, the thickness of the discharged stack in the step (3) is controlled to be 50-80cm, and the time is controlled to be more than 30 d.
Preferably, the adding amount of the iron salt in the step (3) is 0.2-0.5% of the soil mass.
Preferably, the adding amount of the activated bacteria powder in the step (3) is 2-3% of the mass of the soil.
Preferably, the NaBH in step (3)4The addition amount of (A) is 3-5% of the weight of the iron salt.
Preferably, the adding amount of the water in the step (3) is 5-15% of the soil mass.
As is known, organic pollutants, which are one of the main pollutants commonly existing in soil, can enter a soil system through various ways such as large-scale application of chemical fertilizers and pesticides, sewage irrigation, atmospheric sedimentation, accidental leakage of toxic and harmful hazardous wastes and the like, so that the soil is seriously polluted and secondary pollution of surface water and underground water is caused, and the organic pollutants have attracted wide attention of governments and environmental academia of various countries. At present, technologies for remedying the organic contaminated soil environment mainly include physical remediation, chemical remediation, electrochemical remediation, microbial remediation and the like. However, the existing single repair technology has the defect of low efficiency. The invention creatively utilizes the chemical-microorganism cooperative repair technology to realize the high-efficiency repair of the organic contaminated soil.
The method comprises the steps of firstly crushing straws and vermiculite into powder, then mixing and stirring the powder with the manure of a farm, and adding biomass charcoal and organic acid to obtain the soil remediation functional mixed material. The straw powder can be decomposed after being added into soilHumic acid is generated, the physical and chemical properties of soil are improved, the nutritional status of the soil is improved, the soil fertility is improved, and the carrier can be used for solidifying microorganisms, so that the microorganisms can play a better effect in organic soil remediation. The vermiculite can be used as a soil conditioner, and has good cation exchange property and adsorbability, so that the structure of soil can be improved, water can be stored, soil moisture can be preserved, the air permeability and water content of the soil can be improved, and acid soil can be changed into neutral soil; the vermiculite can also play a role in buffering, hinder the rapid change of the pH value, enable the fertilizer to be slowly released in a crop growth medium, and allow the fertilizer to be used in a slight excess manner without harm to plants; the vermiculite can also provide K, Mg, Ca and Fe contained by the vermiculite and trace elements such as Mn, Cu, Zn and the like for crops; the vermiculite has the characteristics of water absorption, cation exchange and chemical components, so that the vermiculite has multiple functions of fertilizer retention, water storage, air permeability, mineral fertilizer and the like. The manure residues in the farm are heated and converted into humus under the action of the compound bacteria, and generate nutrient elements such as nitrogen and phosphorus while generating heat, so that the soil fertility can be improved, and the organic fertilizer is a soil organic fertilizer with excellent performance. The biomass charcoal is a porous solid particulate matter rich in carbon generated by pyrolysis of biomass rich in carbon under the condition of no oxygen or oxygen deficiency. The material contains a large amount of carbon and plant nutrient substances, has a rich pore structure, a large specific surface area and a large number of oxygen-containing active groups on the surface, and is a multifunctional material; it not only can improve soil, increase fertility, adsorb heavy metal and organic pollutant in soil or sewage, but also has better fixing effect on carbon and nitrogen, and can reduce CO when applied to soil2、N2O、CH4And the emission of greenhouse gases is reduced, and the global warming is slowed down. The organic acid can increase the effectiveness and mobility of inorganic nutrients through the action of dissolution, complexation and the like, and certain organic acids have physiological activity and can promote the growth of plants at low concentration, so the addition amount of the organic acid needs to be controlled.
Further, the compound bacterial liquid and the mixed bacterial liquid blended with water are added into the mixed material to be uniformly stirred, and the activated bacterial powder is obtained after stacking treatment and oxidation. When the compound bacteria are added into soil after activation, the organic pollutants in the soil can be metabolized, and then the pollutants are converted and degraded into carbon dioxide, water and the like, and meanwhile, various environmental conditions of the soil, such as nutrition, oxidation-reduction potential and co-metabolism matrix, can be changed, and the purpose of repairing the organic pollutant soil is achieved.
Furthermore, the organic contaminated soil is smashed and sieved, so that the soil remediation material can play a role conveniently; then adding iron salt, mixing uniformly, then adding activated bacterium powder and NaBH4And uniformly mixing and stirring, spraying proper amount of water to wet the base leather and cover the plastic film, discharging and stacking, and realizing the remediation of the organic polluted soil. In the whole process, the manure is heated and converted into humus under the action of the compound bacteria, the straw powder, the vermiculite powder, the biomass charcoal and the organic acid play a role, the vermiculite powder can improve the activity of the bacteria powder, and the activated compound bacteria convert and degrade various organic pollutants such as chlorine-containing solvents, benzene, phenanthrene and the like in soil; further heat generation causes NaBH4The method has the advantages that the reduction effect is exerted, the ferric salt is reduced into the nano iron particles in situ in the soil, the nano zero-valent iron can effectively repair heavy metals due to large surface area and high surface reaction activity, the defects that the nano iron particles are difficult to disperse and the iron particle interface is easy to passivate when being directly added into the soil are overcome, and the purpose of efficiently repairing the organic polluted soil by virtue of the cooperation of chemistry and microorganisms is finally realized.
The existing soil organic pollutant adopts chemical remediation and microbial remediation technologies to remedy the defect of low efficiency, and the application of the existing soil organic pollutant is limited. In view of the above, the invention provides a method for restoring organic contaminated soil through chemical-microbial synergism, which comprises the steps of crushing straws and vermiculite into powder, mixing and stirring the powder with farm manure, adding biomass charcoal and organic acid, adding a composite bacterial liquid and water after being mixed, uniformly stirring, and stacking to obtain activated bacterial powder; crushing the soil to be restored by using a spiral stirrer, sieving, adding ferric salt, uniformly mixing, then adding activated bacteria powder and NaBH4, uniformly stirring, spraying a proper amount of water for wetting, discharging and stacking, covering a plastic film, finishing the soil restoration, and returning the soil to the field directly. The method provided by the invention realizes the purposes of effective chemical-microbial synergy and high-efficiency remediation of the organic contaminated soil, and has important significance for soil remediation and even agricultural development.
The invention provides a method for restoring organic contaminated soil by chemical-microbial synergy, which has the outstanding characteristics and excellent effects compared with the prior art:
1. the method realizes the purposes of effective chemical-microbial synergy and high-efficiency remediation of the organic contaminated soil, and has important significance for soil remediation and even agricultural development.
2. The invention protects the composite bacteria in the straw, vermiculite powder and the farm manure to obtain activated bacteria powder, adds the activated bacteria powder into the soil, adds iron salt and NaBH into the soil4The manure is heated and converted into humus under the action of the compound bacteria, and meanwhile, the compound bacteria are converted into various organic pollutants such as chlorine-containing solvents, benzene, phenanthrene and the like in the soil; further heat generation causes NaBH4The method has the advantages that the reduction effect is exerted, the ferric salt is reduced into the nano iron particles in situ in the soil, the nano iron particles effectively repair the heavy metal, the defects that the nano iron particles are difficult to disperse and the interface of the iron particles is easy to passivate when the nano iron particles are directly added into the soil are overcome, and the remediation of the organic contaminated soil is realized.
Drawings
FIG. 1: the method of the invention is a process flow chart for chemical-microbial synergistic remediation of organic contaminated 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) Crushing 100kg of wheat straw and 12.5kg of vermiculite into powder, mixing and stirring the powder and 55kg of pig farm manure, and then adding 5.5kg of corn straw biomass charcoal and 1.5kg of oxalic acid to obtain a mixed material;
(2) mixing EM bacterial liquid and water uniformly according to the mass ratio of 1:10 to obtain mixed bacterial liquid, then adding the mixed bacterial liquid into the mixed material, uniformly stirring, wherein the using amount of the EM bacterial liquid is 0.15% of the total mass of the mixed material, and then stacking for 4d to obtain activated bacterial powder;
(3) crushing the polluted soil to be restored by using a spiral stirrer, sieving the crushed soil with a 50-mesh sieve, adding ferric sulfate, uniformly mixing the ferric sulfate and the soil, wherein the adding amount of the ferric sulfate is 0.35 percent of the mass of the soil, and then adding activated bacterium powder and NaBH4Mixing and stirring uniformly, the adding amount of the activated bacterium powder is 2.5 percent of the mass of the soil, and NaBH is added4The adding amount of the water is 4% of the mass of the ferric salt, then spraying a proper amount of water for moistening, the adding amount of the water is 10% of the mass of the soil, simultaneously covering a plastic film, discharging and stacking, controlling the thickness of discharging and stacking to be 65cm, controlling the time to be 30d, finishing the soil remediation, and directly returning the soil to the field, thereby realizing the chemical-microbial synergistic remediation of the organic contaminated soil.
Example 2
(1) Crushing 100kg of rice straw and 11kg of vermiculite into powder, mixing and stirring the powder with 52kg of sheep farm manure residues, and then adding 6kg of corn straw biomass charcoal and 1.2kg of acetic acid to obtain a mixed material;
(2) mixing EM bacterial liquid and water uniformly according to the mass ratio of 1:10 to obtain mixed bacterial liquid, then adding the mixed bacterial liquid into the mixed material, uniformly stirring, wherein the using amount of the EM bacterial liquid is 0.12% of the total mass of the mixed material, and then stacking for 3d to obtain activated bacterial powder;
(3) crushing the polluted soil to be restored by using a spiral stirrer, sieving the crushed soil with a 50-mesh sieve, adding ferric chloride, uniformly mixing, wherein the adding amount of the ferric chloride is 0.3 percent of the mass of the soil, and then adding activated bacterium powder and NaBH4Mixing and stirring uniformly, the adding amount of the activated bacterium powder is 2.2 percent of the mass of the soil, and NaBH is added4The adding amount of the water is 3.5 percent of the mass of the ferric salt, then spraying proper amount of water for moistening, the adding amount of the water is 8 percent of the mass of the soil, simultaneously covering a plastic film, discharging and stacking, controlling the thickness of discharging and stacking to be 60cm, controlling the time to be 31d, finishing the soil remediation, and directly returning to the field to realize the chemical-microbial synergistic remediation of the organic contaminated soil.
Example 3
(1) Crushing 100kg of corn straw and 14kg of vermiculite into powder, mixing and stirring the powder and 58kg of chicken farm manure residues, and then adding 7kg of corn straw biomass charcoal and 1.8kg of citric acid to obtain a mixed material;
(2) mixing EM bacterial liquid and water uniformly according to the mass ratio of 1:12 to obtain mixed bacterial liquid, then adding the mixed bacterial liquid into the mixed material, uniformly stirring, wherein the using amount of the EM bacterial liquid is 0.18 percent of the total mass of the mixed material, and then stacking for 5d to obtain activated bacterial powder;
(3) crushing the polluted soil to be restored by using a spiral stirrer, sieving the crushed soil with a 50-mesh sieve, adding ferric sulfate, uniformly mixing the mixture, wherein the adding amount of the ferric sulfate is 0.4 percent of the mass of the soil, and then adding activated bacterium powder and NaBH4Mixing and stirring uniformly, the adding amount of the activated bacterium powder is 2.8 percent of the mass of the soil, and NaBH is added4The adding amount of the water is 4.5 percent of the mass of the ferric salt, then spraying proper amount of water for moistening, the adding amount of the water is 12 percent of the mass of the soil, simultaneously covering a plastic film, discharging and stacking, controlling the thickness of discharging and stacking to be 70cm, controlling the time to be 33d, finishing the soil remediation, and directly returning to the field to realize the chemical-microbial synergistic remediation of the organic contaminated soil.
Example 4
(1) Crushing 100kg of cassava straw and 10kg of vermiculite into powder, mixing and stirring the powder with 50kg of pig farm manure, and then adding 3kg of corn straw biomass charcoal and 1kg of citric acid to obtain a mixed material;
(2) mixing EM bacterial liquid and water uniformly according to the mass ratio of 1:12 to obtain mixed bacterial liquid, then adding the mixed bacterial liquid into the mixed material, uniformly stirring, wherein the using amount of the EM bacterial liquid is 0.1% of the total mass of the mixed material, and then stacking for 3d to obtain activated bacterial powder;
(3) crushing the polluted soil to be restored by using a spiral stirrer, sieving the crushed soil with a 50-mesh sieve, adding ferric chloride, uniformly mixing, wherein the adding amount of the ferric chloride is 0.2 percent of the mass of the soil, and then adding activated bacterium powder and NaBH4Mixing and stirring uniformly, the adding amount of the activated bacterium powder is 2 percent of the soil mass, and NaBH is added4The adding amount of the water is 3 percent of the mass of the ferric salt, then the water is sprayed with proper amount of water for moistening, the adding amount of the water is 5 percent of the mass of the soil, meanwhile, a plastic film is covered, the materials are discharged and stacked, the thickness of the discharged and stacked materials is controlled to be 50cm, the time is controlled to be 33d, the soil remediation can be completed, the soil is directly returned to the field, and the chemical-microbial synergistic remediation of the organic polluted soil is realized.
Example 5
(1) Crushing 100kg of rape straw and 15kg of vermiculite into powder, mixing and stirring the powder with 60kg of chicken farm manure, and then adding 8kg of corn straw biomass charcoal and 2kg of acetic acid to obtain a mixed material;
(2) mixing EM bacterial liquid and water uniformly according to the mass ratio of 1:15 to obtain mixed bacterial liquid, then adding the mixed bacterial liquid into the mixed material, uniformly stirring, wherein the using amount of the EM bacterial liquid is 0.2% of the total mass of the mixed material, and then stacking for 5d to obtain activated bacterial powder;
(3) crushing the polluted soil to be restored by using a spiral stirrer, sieving the crushed soil with a 50-mesh sieve, adding ferric sulfate, uniformly mixing the mixture, wherein the adding amount of the ferric sulfate is 0.5 percent of the mass of the soil, and then adding activated bacterium powder and NaBH4Mixing and stirring uniformly, the adding amount of the activated bacterium powder is 3 percent of the soil mass, and NaBH is added4The adding amount of the water is 5 percent of the mass of the ferric salt, then spraying a proper amount of water for moistening, the adding amount of the water is 15 percent of the mass of the soil, simultaneously covering a plastic film, discharging and stacking, controlling the thickness of discharging and stacking to be 80cm, controlling the time to be 35d, finishing the soil remediation, and directly returning the soil to the field, thereby realizing the chemical-microbial synergistic remediation of the organic contaminated soil.
Comparative example 1
(1) Crushing 100kg of wheat straw and 12.5kg of vermiculite into powder, mixing and stirring the powder and 55kg of pig farm manure, and then adding 5.5kg of corn straw biomass charcoal and 1.5kg of oxalic acid to obtain a mixed material;
(2) mixing EM bacterial liquid and water uniformly according to the mass ratio of 1:10 to obtain mixed bacterial liquid, then adding the mixed bacterial liquid into the mixed material, uniformly stirring, wherein the using amount of the EM bacterial liquid is 0.15% of the total mass of the mixed material, and then stacking for 4d to obtain activated bacterial powder;
(3) the method comprises the steps of smashing polluted soil to be repaired by using a spiral stirrer, sieving by using a 50-mesh sieve, adding nano iron particles, wherein the adding amount of the nano iron particles is 0.1% of the mass of the soil, adding activated bacteria powder, the adding amount of the activated bacteria powder is 2.5% of the mass of the soil, spraying appropriate amount of water for moistening, wherein the adding amount of the water is 10% of the mass of the soil, simultaneously covering a plastic film, discharging and stacking, controlling the discharging and stacking thickness to be 65cm, controlling the time to be 30d, completing soil repair, and returning the soil to the field directly, so that the chemical-microbial synergistic repair of the organic polluted soil is realized.
Compared with the example 1, the comparative example 1 has no iron salt added for reducing into the nano-iron, but directly adds the same amount of nano-iron particles into the soil, and the rest is completely consistent with the example 1.
Comparative example 2
(1) Crushing 100kg of wheat straw into powder, mixing and stirring the powder with 55kg of pig farm manure, and then adding 5.5kg of corn straw biomass charcoal and 1.5kg of oxalic acid to obtain a mixed material;
(2) mixing EM bacterial liquid and water uniformly according to the mass ratio of 1:10 to obtain mixed bacterial liquid, then adding the mixed bacterial liquid into the mixed material, uniformly stirring, wherein the using amount of the EM bacterial liquid is 0.15% of the total mass of the mixed material, and then stacking for 4d to obtain activated bacterial powder;
(3) crushing the polluted soil to be restored by using a spiral stirrer, sieving the crushed soil with a 50-mesh sieve, adding ferric sulfate, uniformly mixing the ferric sulfate and the soil, wherein the adding amount of the ferric sulfate is 0.35 percent of the mass of the soil, and then adding activated bacterium powder and NaBH4Mixing and stirring uniformly, the adding amount of the activated bacterium powder is 2.5 percent of the mass of the soil, and NaBH is added4The adding amount of the water is 4% of the mass of the ferric salt, then spraying a proper amount of water for moistening, the adding amount of the water is 10% of the mass of the soil, simultaneously covering a plastic film, discharging and stacking, controlling the thickness of discharging and stacking to be 65cm, controlling the time to be 30d, finishing the soil remediation, and directly returning the soil to the field, thereby realizing the chemical-microbial synergistic remediation of the organic contaminated soil.
Comparative example 2 compared with example 1, no vermiculite was used in the cultivation of the activated bacterial powder, and the rest was completely identical with example 1.
The test method comprises the following steps:
the same batch of soil polluted by heavy metals and organic pollutants is used as a restoration object, wherein the soil has the hexavalent chromium content of 147.6mg/kg and the 2-chlorophenol content of 197.5 mg/kg, and after restoration is carried out according to the schemes of examples 1-5 and comparative examples 1-2, the hexavalent chromium content and the 2-chlorophenol content in the soil cup are shown in Table 1.
Table 1:
through tests, the method disclosed by the invention enables NaBH4 to play a reducing role through heat generation, reduces iron salt into nano iron particles in situ in soil, and overcomes the defects that the nano iron particles are difficult to disperse and the interface of the iron particles is easy to passivate when being directly added into the soil. The formed nano zero-valent iron has the characteristics of large specific surface area, strong reducibility and the like. Effectively reduces hexavalent chromium. Comparative example 1 no iron salt is added to reduce into nano-iron, but the nano-iron particles with the same amount are directly added into the soil, and the reduction effect on hexavalent chromium is obviously reduced. Comparative example 2 no vermiculite was used when cultivating activated fungal powder, which was slightly less active, affecting the decomposition effect of organic pollutants on soil.
Claims (9)
1. A chemical-microbe synergistic method for repairing organic polluted soil is characterized in that the method comprises the steps of crushing polluted soil, sieving, adding ferric salt, mixing, adding activated bacterium powder and NaBH4Mixing and stirring uniformly, then spraying a proper amount of water, covering a plastic film, discharging and stacking, namely completing soil remediation and returning the soil to the field directly; the activated bacterium powder is prepared by crushing straws and vermiculite, mixing and stirring the crushed straws and vermiculite with farm manure, then adding biomass charcoal and organic acid, then adding composite bacterium liquid and water, uniformly stirring, and stacking, and the method specifically comprises the following steps:
(1) crushing straws and vermiculite into powder, mixing and stirring the powder with the manure residue of a farm, and then adding biomass charcoal and organic acid to obtain a mixed material;
(2) uniformly mixing the compound bacterial liquid and water to obtain mixed bacterial liquid, adding the mixed bacterial liquid into the mixed material, uniformly stirring, and then stacking to obtain activated bacterial powder;
(3) crushing the organic contaminated soil to be repaired by using a spiral stirrer, sieving, adding ferric salt, uniformly mixing, adding activated bacterium powder and NaBH4Mixing and stirring uniformly, spraying appropriate amount of water for moistening, covering with plastic film, discharging and stacking to complete soil remediation, and returning to field directly, thereby realizing chemical-microbial synergistic remediation of organic contaminated soil。
2. The method for chemical-microbial cooperative remediation of organically-polluted soil according to claim 1,
the straw is one or the combination of more than two of wheat straw, rice straw, corn straw, cassava straw, rape straw, cotton straw and sugarcane straw;
the farm manure residues are one or the combination of more than two of pig farm manure residues, sheep farm manure residues and chicken farm manure residues;
the organic acid is one or the combination of more than two of oxalic acid, acetic acid and citric acid;
the compound bacterial liquid is EM bacterial liquid;
the iron salt is one of ferric sulfate and ferric chloride.
3. The method for chemical-microbial synergistic remediation of organic contaminated soil according to claim 1, wherein in the preparation of the mixed material in the step (1), the mass ratio of the straw, the vermiculite, the farm manure, the biomass charcoal and the organic acid is 100:10-15:50-60:3-8: 1-2.
4. The method for chemically-microbially cooperative remediation of organic contaminated soil according to claim 1, wherein the amount of the compound bacterial liquid used in the step (2) is 0.1-0.2% of the total mass of the mixture.
5. The method for chemically-microbially cooperative remediation of organic contaminated soil according to claim 1, wherein in the preparation of the mixed bacterial liquid in the step (2), the mass ratio of the composite bacterial liquid to water is 1-2: 10-20.
6. The method for chemical-microbial cooperative remediation of organic contaminated soil according to claim 1, wherein the time period of said stacking treatment in step (2) is 3-5 d.
7. The method for chemical-microbial cooperative remediation of organically-polluted soil according to claim 1, wherein the mesh number of the screen in the step (3) is 50 mesh.
8. The method for chemical-microbial cooperative remediation of organic contaminated soil according to claim 1, wherein the thickness of the discharged stack in step (3) is controlled to be 50-80cm and the time is controlled to be more than 30 d.
9. The method for chemical-microbial synergistic remediation of organically-polluted soil according to claim 1, wherein the iron salt is added in the step (3) in an amount of 0.2-0.5% of the soil mass; the adding amount of the activated bacterium powder is 2-3% of the mass of the soil; the NaBH4The adding amount of the iron salt is 3-5% of the weight of the iron salt; the addition amount of the water is 5-15% of the mass of the soil.
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| CN113458140A (en) * | 2021-06-02 | 2021-10-01 | 广东新泓环境咨询有限公司 | Polycyclic aromatic hydrocarbon soil pollution remediation method and application |
-
2020
- 2020-12-04 CN CN202011396745.6A patent/CN112676331A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113458140A (en) * | 2021-06-02 | 2021-10-01 | 广东新泓环境咨询有限公司 | Polycyclic aromatic hydrocarbon soil pollution remediation method and application |
| CN113458140B (en) * | 2021-06-02 | 2022-01-25 | 广东新泓环境科技有限公司 | Polycyclic aromatic hydrocarbon soil pollution remediation method and application |
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