CN111793500A - Heavy metal contaminated soil remediation agent and preparation method thereof - Google Patents
Heavy metal contaminated soil remediation agent and preparation method thereof Download PDFInfo
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- CN111793500A CN111793500A CN202010453369.3A CN202010453369A CN111793500A CN 111793500 A CN111793500 A CN 111793500A CN 202010453369 A CN202010453369 A CN 202010453369A CN 111793500 A CN111793500 A CN 111793500A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C11/00—Other nitrogenous fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
Abstract
The invention discloses a heavy metal contaminated soil repairing agent and a preparation method thereof, belonging to the technical field of soil repair, the heavy metal contaminated soil repairing agent and the preparation method thereof, wherein modified bentonite is selected as a heavy metal adsorption main body of the repairing agent, activated sludge and an active adsorbent are additionally arranged in the modified bentonite, the adsorption effect of the adsorbent is effectively improved, on one hand, the soil nutrition is effectively improved through the cooperation of an ionic reducing agent and an organic fertilizer, on the other hand, the soil cation exchange capacity is increased through the ionic reducing agent, an insoluble metal organic compound is formed, the heavy metal in the soil can be converted into a chemically inactive form, in addition, a layer of biological film-forming agent of a biological microbial inoculum is coated on the outer surface of the adsorbent, the effects of fixing, moving or transforming and degrading the heavy metal in the soil are further realized, and simultaneously, the microbial bacteria are flooded in the soil, a layer of film is formed on the surface layer of the plant root hair, and the film can protect the root hair and convey fertilizer.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a heavy metal contaminated soil remediation agent and a preparation method thereof.
Background
The soil heavy metal pollution has the characteristics of concealment, long-term property and irreversibility, the soil heavy metal pollution is a serious environmental problem, the pollutants have poor mobility in the soil and long residence time and cannot be degraded by microorganisms, and the human health is finally influenced by media such as water, plants and the like.
At present, the cultivated land area polluted by heavy metal in China is 266722 kilohm, which occupies 1/6 of the total cultivated land area in China, wherein 1133 kilohm of Cd-polluted cultivated land relates to 11 provinces and 25 regions. Heavy metal pollutants belong to a priority control pollutant, and the pollution and harm of heavy metals in the environment are determined by the content distribution, chemical characteristics, environmental chemical behaviors, migration and transformation of heavy metals in the environment and the toxicity of heavy metals to organisms.
Soil remediation refers to a technical measure for restoring normal functions of polluted soil by using an external means, and the current soil heavy metal remediation technologies are mainly divided into phytoremediation, microbial remediation, physical and chemical remediation and agricultural engineering remediation technologies. In the prior art, the most commonly used restoration means is physical soil restoration, and the physical soil adsorption means is simple and easy to implement: technologists add a curing agent or an adsorbent to soil to combine and fix or adsorb heavy metals in the soil, the currently reported curing agent or adsorbent mainly comprises zeolite, diatomite, sepiolite, bentonite, limestone and the like, and the commonly used curing agent or adsorbent in the prior art has single adsorption and curing functions, and the single effect of physical remediation method is not obvious and slow, and the soil remediation effect of the curing agent or adsorbent is yet to be improved.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a heavy metal contaminated soil remediation agent and a preparation method thereof, wherein modified bentonite is selected as a heavy metal adsorption main body of the remediation agent, activated sludge and an active adsorbent are additionally arranged in the modified bentonite, the adsorption effect of the adsorbent is effectively improved, through the cooperation of an ionic reducing agent and an organic fertilizer, the soil nutrition is effectively improved on one hand, on the other hand, the soil cation exchange capacity is increased through the ionic reducing agent, an insoluble metal organic compound is formed, the heavy metal in the soil can be converted into a chemically inactive form, in addition, a biological film-forming agent of a biological microbial inoculum is coated on the outer surface of the adsorbent, the effects of fixing, moving or converting and degrading the heavy metal in the soil are further achieved, and a layer of film is formed on the surface layer of plant root hair after microbial bacteria are flooded in the soil, has effects of protecting root and hair and delivering fertilizer.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The heavy metal contaminated soil remediation agent comprises the following components in parts by weight: 50-65 parts of modified bentonite, 20-35 parts of activated sludge, 10-15 parts of organic fertilizer, 3-8 parts of biological agent, 5-10 parts of active adsorbent and 3-5 parts of ion reducing agent.
Furthermore, the modified bentonite is prepared by modifying common bentonite with aluminum sulfate and silver nitrate, the modified bentonite is Al-Ag salt modified bentonite, a proper amount of bactericide and sodium hydroxide solution are added in the modification process, the bactericide is used for improving the soil sterilization performance of the Al-Ag salt modified bentonite, the sodium hydroxide solution is used for adjusting the pH value of the Al-Ag salt modified bentonite, and Al-Ag salt modified bentonite particles have a large number of micropores with complex structures, so that a large number of adsorption points are provided for heavy metal adsorption, and the adsorption, complexation and precipitation of heavy metals in soil are facilitated.
Further, the preparation process of the Al-Ag salt modified bentonite is as follows:
firstly, weighing 300g of bentonite, adding a proper amount of water into the bentonite, and stirring and mixing to prepare a bentonite solution;
adding aluminum sulfate and silver nitrate into the bentonite solution, stirring and mixing, adding 500g of bactericide and a proper amount of NaOH solution into the bentonite solution, stirring by magnetic force, and centrifugally cleaning;
and (4) centrifuging and then drying in vacuum to obtain the Al-Ag salt modified bentonite.
Furthermore, the organic fertilizer is prepared by mixing chicken manure, biogas slurry, lignin and plant ash in a ratio of 3:2:1:2 by weight, and is matched with bentonite to improve the soil nutrition.
Further, the biological agent is prepared by mixing a polyglutamic acid solution, bacillus subtilis spore powder, azotobacter powder and silicate bacteria powder in a ratio of 1:2:0.5:1, the polyglutamic acid solution is poly-gamma-glutamic acid which has excellent water solubility, super-strong adsorbability and biodegradability, a degradation product is pollution-free glutamic acid which is an excellent environment-friendly high polymer material, and the polyglutamic acid solution is matched with the bacillus subtilis spore powder, the azotobacter powder and the silicate bacteria powder and can form a layer of film on the surface layer of plant root hairs when being used as a heavy metal ion adsorbent and submerged in soil, so that the biological agent has a function of protecting the root hairs, and is an optimal conveying platform for the close contact of nutrients and water in the soil and the root hairs, can effectively improve the dissolution, storage, transportation and absorption of the fertilizer.
Furthermore, the activated adsorbent is made of activated carbon and furnace ash, the weight ratio of the activated carbon to the furnace ash is 2:1, the ionic reducing agent is made of condensed silica fume and sodium sulfite, the weight ratio of the condensed silica fume to the sodium sulfite is 1:2, and the activated adsorbent is easy to form a plurality of pores on the surface of the repairing agent, so that the adsorption capacity of the repairing agent on heavy metals is further effectively improved.
A preparation method of a heavy metal contaminated soil remediation agent comprises the following steps:
s1: weighing the raw materials of the components according to the weight ratio for later use;
s2: crushing and grinding the modified bentonite in parts by weight by using a bentonite pulverizer to obtain modified bentonite powder with the particle size of 200 meshes, adding the modified bentonite powder and an active adsorbent into a stirrer, and mixing and stirring for 0.5-1h to obtain a mixture A;
s3: adding activated sludge, an ionic reducing agent and a proper amount of industrial water into the mixture A in the S2, mixing and stirring for 1-2 hours to obtain a mixture B, adding an organic fertilizer into the mixed solution B, mixing and stirring for 0.5-1 hour to obtain a mixture C;
s4: feeding the mixture C into a granulator for granulation, wherein the granulator is one of a disk granulator and a rotary drum granulator, adding a proper amount of water vapor into the granulator for granulation in a matching manner, and drying and cooling the repairing agent produced by the granulator for later use;
s5: the method comprises the steps of preparing a biological film forming agent by matching a biological agent with a proper amount of a binder and a diluent, placing the cooled repairing agent into a stirrer, erecting a spraying mechanism on the stirrer, uniformly spraying the biological film forming agent on the repairing agent through the spraying mechanism, and uniformly stirring to obtain the heavy metal polluted soil repairing agent.
Further, spout and cover the fixed establishment of inlaying of mechanism and install on the agitator, the agitator is cylindric structure, the opening has been seted up to the upper end of agitator, spout the bottom that covers the mechanism and be linked together through opening and agitator inside, the one end of agitator is equipped with the blanking mouth, the one end fixed mounting that the blanking mouth was kept away from to the agitator has the rotating electrical machines, the drive end of rotating electrical machines runs through agitator and fixedly connected with spiral (mixing) shaft, and spiral (mixing) shaft rotates under the drive of rotating electrical machines, and after the restorative is leading-in to the agitator in, through spouting the mechanism spraying atomizing biological film-forming agent in to the agitator, atomizing biological film-forming agent evenly spouts to cover on the restorative agent, exports from the blanking mouth at the in-process of stirring and will spout the restorative agent after covering.
Further, spout and cover mechanism including inlaying and establish the fixed frame of installing on the opening top, fixed frame is close to fixed mounting on the one end lateral wall of rotating electrical machines has the toper feed inlet, fixed frame is close to top portion and inlays to establish and be connected with and spout and cover the pipe, the one end of spouting and covering the pipe is external to have the feed liquor pipe, spout the equidistant a plurality of atomizing nozzle of installing in bottom of covering the pipe.
Further, fixed mounting has the dispersion board on the fixed frame is close to the lateral wall of bottom, the dispersion board is located atomizing nozzle's bottom, and the dispersion board is located the side top of toper feed inlet, and the dispersion board set up the diffusion effect that has further effectively improved atomizing biological film-forming agent.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme selects the modified bentonite as a heavy metal adsorption main body of the repairing agent, the activated sludge and the active adsorbent are additionally arranged in the modified bentonite, the adsorption effect of the adsorbent is effectively improved, on the premise of effectively improving the soil nutrition through the matching of the ion reducing agent and the organic fertilizer, the nutrition absorption of the vegetation root is easy, meanwhile, the cation exchange capacity of the soil is increased through the ion reducing agent, an insoluble metal organic compound is easy to form, the heavy metal in the soil can be converted into a chemically inactive form, the processes of migration, diffusion and the like in the environment are prevented, in addition, a layer of biological film forming agent of biological bactericide is coated on the outer surface of the adsorbent, the effects of fixing, moving or transforming and degrading the heavy metal in the soil are further achieved, and a layer of film is formed on the surface layer of the plant root hair after the microorganism bacterium is flooded in the soil, not only has the function of protecting the root hair, but also is an optimal conveying platform for closely contacting the nutrient and the moisture in the soil with the root hair, and can effectively improve the dissolution, the storage and the conveying of the fertilizer.
(2) The modified bentonite is prepared by modifying common bentonite by adopting aluminum sulfate and silver nitrate, the modified bentonite is Al-Ag salt modified bentonite, a proper amount of bactericide and sodium hydroxide solution are added in the modification process, the bactericide is used for improving the soil sterilization performance of the Al-Ag salt modified bentonite, the sodium hydroxide solution is used for adjusting the pH value of the Al-Ag salt modified bentonite, and Al-Ag salt modified bentonite particles have a large number of micropores with complex structures, so that a large number of adsorption points are provided for heavy metal adsorption, and the adsorption, complexation and precipitation of heavy metals in soil are facilitated.
(3) The active adsorbent is made of active carbon and furnace ash, the weight ratio of the active carbon to the furnace ash is 2:1, the ionic reducing agent is made of condensed silica fume and sodium sulfite, the weight ratio of the condensed silica fume to the sodium sulfite is 1:2, and the active adsorbent is easy to form a plurality of pores on the surface of the repairing agent, so that the adsorption capacity of the repairing agent on heavy metals is further effectively improved.
(4) The spraying mechanism is used for spraying the biological agent on the outer surface of the adsorbent to coat a layer of biological film on the outer surface, so that the repairing agent has a certain biological adsorption effect, the adsorption and decomposition performance on soil is easily improved, and the adsorption quality is improved.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a perspective view of the mixer and spray mechanism combination of the present invention;
FIG. 3 is a perspective view of the mixer of the present invention;
FIG. 4 is a perspective view of the junction of the rotating motor and the helical agitator shaft of the present invention;
FIG. 5 is a schematic view of the internal structure of the spraying mechanism of the present invention.
The reference numbers in the figures illustrate:
1 stirrer, 101 blanking port, 102 opening, 2 fixing frame, 201 taper feed port, 3 spray pipe, 4 atomizing nozzle, 5 rotating motor, 6 spiral stirring shaft and 7 dispersion plate.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, a heavy metal contaminated soil remediation agent comprises the following components in parts by weight: 50-65 parts of modified bentonite, 20-35 parts of activated sludge, 10-15 parts of organic fertilizer, 3-8 parts of biological agent, 5-10 parts of active adsorbent and 3-5 parts of ion reducing agent.
The modified bentonite is prepared by modifying common bentonite with aluminum sulfate and silver nitrate, the modified bentonite is Al-Ag salt modified bentonite, a proper amount of bactericide and sodium hydroxide solution are added in the modification process, the bactericide is used for improving the soil sterilization performance of the Al-Ag salt modified bentonite, the sodium hydroxide solution is used for adjusting the pH value of the Al-Ag salt modified bentonite, and Al-Ag salt modified bentonite particles have a large number of micropores with complex structures, so that a large number of adsorption points are provided for heavy metal adsorption, and the adsorption, complexation and precipitation of heavy metals in soil are facilitated.
The preparation process of the Al-Ag salt modified bentonite is as follows:
firstly, weighing 300g of bentonite, adding a proper amount of water into the bentonite, and stirring and mixing to prepare a bentonite solution;
adding aluminum sulfate and silver nitrate into the bentonite solution, stirring and mixing, adding 500g of bactericide and a proper amount of NaOH solution into the bentonite solution, stirring by magnetic force, and centrifugally cleaning;
and (4) centrifuging and then drying in vacuum to obtain the Al-Ag salt modified bentonite.
Specifically, the organic fertilizer is prepared by mixing chicken manure, biogas slurry, lignin and plant ash in a weight ratio of 3:2:1:2, the organic fertilizer is used in combination with bentonite, soil nutrition is improved, the biological agent is prepared by mixing polyglutamic acid solution, bacillus subtilis spore powder, azotobacter powder and silicate bacteria powder in a weight ratio of 1:2:0.5:1, the polyglutamic acid solution is poly-gamma-glutamic acid, the polyglutamic acid solution has excellent water solubility, super-strong adsorbability and biodegradability, a degradation product is pollution-free glutamic acid, the organic fertilizer is an excellent environment-friendly high polymer material, and the organic fertilizer can be used as a heavy metal ion adsorbent by combining with the bacillus subtilis spore powder, the azotobacter powder and the silicate bacteria powder, when the fertilizer is flooded in soil, a layer of film is formed on the surface layer of the plant root hair, so that the fertilizer has the function of protecting the root hair, is an optimal conveying platform for closely contacting nutrients and water in the soil and can effectively improve the dissolution, storage, conveying and absorption of the fertilizer.
In addition, the active adsorbent is made of active carbon and furnace ash, the weight ratio of the active carbon to the furnace ash is 2:1, the ionic reducing agent is made of condensed silica fume and sodium sulfite, the weight ratio of the condensed silica fume to the sodium sulfite is 1:2, and the active adsorbent is easy to form a plurality of pores on the surface of the repairing agent, so that the adsorption capacity of the repairing agent on heavy metals is further effectively improved.
A preparation method of a heavy metal contaminated soil remediation agent comprises the following steps:
s1: weighing the raw materials of each component according to the weight ratio for later use;
s2: crushing and grinding modified bentonite in parts by weight by using a bentonite pulverizer to obtain modified bentonite powder with the particle size of 200 meshes, adding the modified bentonite powder and an active adsorbent into a stirrer, and mixing and stirring for 0.5-1h to obtain a mixture A;
s3: adding activated sludge, an ionic reducing agent and a proper amount of industrial water into the mixture A in the S2, mixing and stirring for 1-2 hours to obtain a mixture B, adding an organic fertilizer into the mixed solution B, mixing and stirring for 0.5-1 hour to obtain a mixture C;
s4: feeding the mixture C into a granulator for granulation, wherein the granulator is one of a disk granulator and a rotary drum granulator, adding a proper amount of water vapor into the granulator for granulation in a matching manner, and drying and cooling the repairing agent produced by the granulator for later use;
s5: the method comprises the steps of preparing a biological film forming agent by matching a biological agent with a proper amount of a binder and a diluent, placing the cooled repairing agent into a stirrer 1, erecting a spraying mechanism on the stirrer 1, uniformly spraying the biological film forming agent on the repairing agent through the spraying mechanism, and uniformly stirring to obtain the heavy metal polluted soil repairing agent.
Referring to fig. 2-5, the spraying mechanism is fixedly embedded and installed on the stirrer 1, the stirrer 1 is a cylindrical structure, the upper end of the stirrer 1 is provided with an opening 102, the bottom end of the spraying mechanism is communicated with the inside of the stirrer 1 through the opening 102, one end of the stirrer 1 is provided with a blanking port 101, one end of the stirrer 1, which is far away from the blanking port 101, is fixedly provided with a rotating motor 5, the driving end of the rotating motor 5 penetrates through the stirrer 1 and is fixedly connected with a spiral stirring shaft 6, the spiral stirring shaft 6 is driven by the rotating motor 5 to rotate, when the repairing agent is introduced into the stirrer 1, the spraying mechanism is used for spraying the atomized biological film-forming agent into the stirrer 1, the atomized biological film-forming agent is uniformly sprayed on the repairing agent, and the sprayed repairing agent is led out from the blanking port 101 in the stirring process, so that a layer of biological microbial agent film is coated on the repairing agent after granulation is, is easy to adsorb and decompose some harmful substances in the soil.
It is specific, spout and cover mechanism including inlaying and establishing the fixed frame 2 of installing on opening 102 top, fixed frame 2 is close to fixed mounting on the one end lateral wall of rotating electrical machines 5 has toper feed inlet 201, fixed frame 2 is close to top portion and inlays to establish and be connected with and spout and cover pipe 3, the one end of spouting and covering pipe 3 is external to have the feed liquor pipe, spout and cover equidistant a plurality of atomizing nozzle 4 of installing in the bottom of pipe 3, fixed frame 2 is close to fixed mounting on the lateral wall of bottom has dispersion board 7, dispersion board 7 is located atomizing nozzle 4's bottom, and dispersion board 7 is located the side top of toper feed inlet 201, dispersion board 7 sets up the diffusion effect that has further effectively improved the biological film-forming agent.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (10)
1. The heavy metal contaminated soil remediation agent is characterized in that: the paint comprises the following components in parts by weight: 50-65 parts of modified bentonite, 20-35 parts of activated sludge, 10-15 parts of organic fertilizer, 3-8 parts of biological agent, 5-10 parts of active adsorbent and 3-5 parts of ion reducing agent.
2. The heavy metal contaminated soil remediation agent of claim 1, wherein: the modified bentonite is prepared by modifying common bentonite with aluminum sulfate and silver nitrate, the modified bentonite is Al-Ag salt modified bentonite, and a proper amount of bactericide and sodium hydroxide solution are added in the modification process, wherein the bactericide is used for improving the soil sterilization performance of the Al-Ag salt modified bentonite, and the sodium hydroxide solution is used for adjusting the pH value of the Al-Ag salt modified bentonite.
3. The heavy metal contaminated soil remediation agent of claim 2, wherein: the preparation process of the Al-Ag salt modified bentonite is as follows:
firstly, weighing 300g of bentonite, adding a proper amount of water into the bentonite, and stirring and mixing to prepare a bentonite solution;
adding aluminum sulfate and silver nitrate into the bentonite solution, stirring and mixing, adding 500g of bactericide and a proper amount of NaOH solution into the bentonite solution, stirring by magnetic force, and centrifugally cleaning;
and (4) centrifuging and then drying in vacuum to obtain the Al-Ag salt modified bentonite.
4. The heavy metal contaminated soil remediation agent of claim 1, wherein: the organic fertilizer is prepared by mixing chicken manure, biogas slurry, lignin and plant ash in a ratio of 3:2:1: 2.
5. The heavy metal contaminated soil remediation agent of claim 1, wherein: the biological agent is prepared by mixing a polyglutamic acid solution, bacillus subtilis spore powder, azotobacter powder and silicate bacteria powder in a ratio of 1:2:0.5: 1.
6. The heavy metal contaminated soil remediation agent of claim 1, wherein: the active adsorbent is prepared from active carbon and furnace ash in a weight ratio of 2:1, the ionic reducing agent is prepared from condensed silica fume and sodium sulfite in a weight ratio of 1: 2.
7. The method for preparing a heavy metal contaminated soil remediation agent as claimed in any one of claims 1 to 6, wherein: the method comprises the following steps:
s1: weighing the raw materials of the components according to the weight ratio for later use;
s2: crushing and grinding the modified bentonite in parts by weight by using a bentonite pulverizer to obtain modified bentonite powder with the particle size of 200 meshes, adding the modified bentonite powder and an active adsorbent into a stirrer, and mixing and stirring for 0.5-1h to obtain a mixture A;
s3: adding activated sludge, an ionic reducing agent and a proper amount of industrial water into the mixture A in the S2, mixing and stirring for 1-2 hours to obtain a mixture B, adding an organic fertilizer into the mixed solution B, mixing and stirring for 0.5-1 hour to obtain a mixture C;
s4: feeding the mixture C into a granulator for granulation, wherein the granulator is one of a disk granulator and a rotary drum granulator, adding a proper amount of water vapor into the granulator for granulation in a matching manner, and drying and cooling the repairing agent produced by the granulator for later use;
s5: the method comprises the steps of preparing a biological film forming agent by matching a biological agent with a proper amount of a binder and a diluent, placing the cooled repairing agent into a stirrer (1), erecting a spraying mechanism on the stirrer (1), uniformly spraying the biological film forming agent on the repairing agent through the spraying mechanism, and uniformly stirring to obtain the heavy metal polluted soil repairing agent.
8. The heavy metal contaminated soil remediation agent of claim 7, wherein: spout to cover the fixed embedding of mechanism and establish and install on agitator (1), agitator (1) is cylindric structure, opening (102) have been seted up to the upper end of agitator (1), spout the bottom that covers the mechanism and pass through opening (102) and agitator (1) inside and be linked together, the one end of agitator (1) is equipped with blanking mouth (101), the one end fixed mounting that blanking mouth (101) were kept away from in agitator (1) has rotating electrical machines (5), the drive end of rotating electrical machines (5) runs through agitator (1) and fixedly connected with spiral stirring shaft (6).
9. The heavy metal contaminated soil remediation agent of claim 8, wherein: spout and cover mechanism including inlaying fixed frame (2) of establishing and installing in opening (102) top, fixed frame (2) are close to fixed mounting on the one end lateral wall of rotating electrical machines (5) have toper feed inlet (201), fixed frame (2) are close to the top portion and inlay to establish and are connected with and spout and cover pipe (3), the one end of spouting and covering pipe (3) is external to have the feed liquor pipe, spout the equidistant a plurality of atomizing nozzle (4) of installing in the bottom of covering pipe (3).
10. The heavy metal contaminated soil remediation agent of claim 9, wherein: fixed frame (2) are close to fixed mounting on the lateral wall of bottom have dispersion board (7), dispersion board (7) are located the bottom of atomizing nozzle (4), and dispersion board (7) are located the side top of toper feed inlet (201).
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| CN113087566A (en) * | 2021-04-08 | 2021-07-09 | 陕西圣千泽建筑工程有限责任公司 | Heavy metal contaminated soil remediation agent |
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Application publication date: 20201020 |