CN112429830B - In-situ constructed bone charcoal catalysis Fe (OH) 2 Environmental remediation method for removing chlorinated hydrocarbon - Google Patents
In-situ constructed bone charcoal catalysis Fe (OH) 2 Environmental remediation method for removing chlorinated hydrocarbon Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention relates to the technical field of environmental management, in particular to in-situ constructed bone charcoal catalysis Fe (OH) 2 An environmental remediation method for removing chlorinated hydrocarbons. The invention pours the bone charcoal suspending liquid, ferrous salt solution and alkali solution into the target pollution place, or mixes the bone charcoal suspending liquid, ferrous salt solution and alkali solution to obtain the bone charcoal catalyzing Fe (OH) 2 Pouring the composite repairing material into a target polluted site, and constructing bone charcoal catalysis Fe (OH) in situ 2 And (4) carrying out in-situ remediation on the reaction system. The method utilizes bone charcoal to catalyze Fe (OH) 2 The reaction system performs reductive dechlorination degradation on the chlorinated hydrocarbons in the soil and underground water, the remediation system is simple and effective, the chlorinated hydrocarbons can be dechlorinated and degraded quickly, and the removal efficiency is high; the method is used for in-situ repair, has good mass transfer effect, no special limitation on the application method, easy realization, small influence of temperature and pH on the reaction process and wide application range, thereby having higher popularization value.
Description
Technical Field
The invention relates to the technical field of environmental management, in particular to in-situ constructed bone charcoal catalysis Fe (OH) 2 An environmental remediation method for removing chlorinated hydrocarbons.
Background
With the acceleration of the urbanization process, many chemical enterprises originally located in urban areas are forced to migrate out from urban central zones, so that a large amount of polluted sites are left, and the problem of organic pollution in soil and underground water pollution is more prominent. Chlorinated hydrocarbon organic substances such as Trichloroethylene (TCE) and tetrachloroethylene (PCE) are frequently detected in underground water and soil of polluted sites in various places. Most of these contaminants have potential "triple-cause" (carcinogenic, teratogenic, mutagenic) hazards. The chlorinated solvent has small water solubility and large migration distance, and aggravates the pollution degree of underground water and soil, so that the treatment and restoration are very difficult. The treatment of chlorinated hydrocarbon pollution in soil and groundwater has become a hotspot and difficult problem in the research field of groundwater and soil all over the world.
In the removal of organic contaminants from soil and groundwater, the in situ chemical reduction process is a relatively fast remediation process that has been developed in recent years. The in-situ chemical reduction method refers to the utilization of reducing materials, such as nano zero-valent iron, sulfurized nano zero-valent iron and patinaReducing chlorine in the chlorinated organic pollutants into chloride ions by the reduction action of the chlorine ions so as to gradually dechlorinate and finally degrade the pollutants. However, the nano material is easy to agglomerate and is easy to oxidize and deactivate. In addition, the preparation process of the vulcanized nano zero-valent iron and the patina is complex, and the large-scale application of the iron-based materials is limited to a certain extent. And the other iron-containing material Fe (OH) 2 The synthesis process is simple and the cost is low. But Fe (OH) alone 2 The chemical reduction activity is low, and the degradation effect on the vinyl chloride is not realized.
The bone charcoal is cheap biochar, and has the advantages of high surface area, developed pores, easy modification and high electron transfer performance. The bone charcoal is used for catalyzing the iron-based material to degrade chlorohydrocarbon, so that the electron transfer between pollutants and the iron material can be enhanced, and the removal efficiency of organic matters is further improved. The bone charcoal and the iron-based material are combined, so that an economical and efficient chemical reduction repair system is provided for soil and underground water repair.
In addition, due to the complex medium of the groundwater environment, the injected agents/materials need to overcome the problem of mass transfer difficulties in the aquifer in situ chemical reduction remediation. Therefore, the size and the fluid mechanical property of the material are regulated and controlled, the injection strategy of the medicament is optimized, and the in-situ chemical reduction repair effect can be improved.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention aims to provide an in-situ constructed bone charcoal catalyst Fe (OH) 2 The environment restoration method for removing the chlorohydrocarbon can realize the high-efficiency treatment of organic pollutants in soil and underground water.
The purpose of the invention is realized by the following technical scheme:
in-situ constructed bone charcoal catalysis Fe (OH) 2 An environmental remediation process for the removal of chlorinated hydrocarbons comprising the steps of:
pouring the bone charcoal suspension, ferrous salt solution and alkali solution into a target polluted site, and constructing the bone charcoal catalysis Fe (OH) in situ 2 A reaction system for in-situ repair;
or mixing bone charcoal suspension, ferrous saltMixing the solution with alkaline solution to obtain Fe (OH) catalyzed by bone charcoal 2 A composite repair material; pouring the catalytic repair material into a target polluted site, and constructing bone charcoal catalyst Fe (OH) in situ 2 A reaction system for in-situ repair;
the bone charcoal is obtained by crushing and carrying out anaerobic pyrolysis on animal bone waste;
the conditions for the anaerobic pyrolysis are preferably in N 2 Carrying out anaerobic pyrolysis for 1-3 h at 300-1000 ℃ in the atmosphere;
the bone charcoal can also be optimized according to the actual site conditions and then mixed with water (for example, the bone charcoal can be mixed by ultrasonic waves) to obtain bone charcoal suspension;
the optimization treatment is preferably at least one of acid treatment, nano treatment and colloid treatment;
the acid treatment comprises the following steps:
adding bone charcoal into hydrochloric acid solution for acid washing; then carrying out solid-liquid separation, washing the solid and drying to obtain bone charcoal after acid treatment;
the concentration of the hydrochloric acid solution is more than 0.1mol/L; the washing is preferably carried out until the pH value is neutral; the drying condition is preferably 50-85 ℃ for 10-12 h;
the nano treatment comprises the following steps:
grinding the bone charcoal to obtain nano bone charcoal;
the grinding condition is preferably grinding for 2 to 5 hours at a rotating speed of 20 to 350 r/min;
the particle size of the nano bone charcoal is preferably 50-500 nm;
the colloidization treatment comprises the following steps:
adding bone charcoal into sodium carboxymethylcellulose solution, and introducing N 2 Stirring is kept for at least 1h; then carrying out solid-liquid separation, washing the solid and drying to obtain gelatinous bone charcoal; wherein, is connected with N 2 In order to maintain the oxygen content in the system<0.5ppm；
The content of the sodium carboxymethyl cellulose in the sodium carboxymethyl cellulose solution is 1 percent by weight, and the solvent water is oxygen-free water;
the washing is preferably carried out until the pH value is neutral;
the drying condition is preferably 50-85 ℃ for 10-12 h;
the concentration of the bone charcoal suspension is preferably 0.1-10 g/L;
the ferrous salt solution is at least one of ferrous sulfate and ferrous chloride;
the concentration of the ferrous salt solution is preferably 0.01-4.95 mol/L;
the solvent water in the ferrous salt solution is oxygen-free water;
the alkali solution is sodium hydroxide solution;
the concentration of the alkali solution is preferably 0.01-27.25 mol/L;
the molar ratio of the alkali solution to the ferrous salt in the ferrous salt solution is preferably (1-40): 1;
the mass ratio of the alkali solution to the bone charcoal suspension is preferably (1-110): 1;
the filling mode is preferably at least one of surface layer stirring, gravity flow, pressurized injection and the like;
in the invention, after in-situ remediation, a soil or underground water sample of a target polluted site is taken for detection, and if the sample meets the acceptance criteria, the remediation of the target polluted area is completed; if the standard is not met, repeating the steps until the standard is met;
the invention provides in-situ constructed bone charcoal catalysis Fe (OH) 2 The environmental remediation method for removing chlorohydrocarbon aims at the main pollutants of difficultly degraded chloroethylene and other oxidative pollutants; the addition amounts of the alkali solution, the bone charcoal suspension and the ferrous salt solution can be adjusted according to the actual soil or underground water pollution condition;
compared with the prior art, the invention has the following advantages and effects:
(1) The environment restoration method provided by the invention is in-situ restoration, has obvious treatment effect, and in-situ construction of bone charcoal catalysis Fe (OH) 2 The reaction system can completely degrade the vinyl chloride in soil and underground water.
(2) Compared with the repair medicament used in the prior art, the bone charcoal is used for catalyzing Fe (OH) 2 The reaction system is easier to diffuse in soil and underground water, thereby improving the remediation effect of the soil and the underground water.
(3) The method adopts the in-situ remediation process to remediate the contaminated soil, is simple compared with the ex-situ remediation process, has low cost, can avoid secondary pollution of the contaminated soil in the transportation process, and is not limited by the environment.
(4) The method adopts the bone charcoal to catalyze the ferrous hydroxide as the repairing agent, and takes the ferrous hydroxide and the bone charcoal as the raw materials, so that the raw materials are low in cost and easy to obtain, the production process is simple, and the method is suitable for large-scale production and application.
(5) The method adopts in-situ treatment of soil and underground water polluted by organic matters, has no special limitation on the application method, is convenient and simple, and is easy to realize, thereby having higher popularization value.
(6) The method not only can effectively repair underground water and soil polluted by the chlorohydrocarbon, but also has high treatment efficiency on other volatile chlorine-containing organic pollutants, and can remove various pollutants.
Drawings
FIG. 1 is the in situ construction of bone charcoal catalysis Fe (OH) of example 1 2 A flow diagram of an environmental remediation process for removing chlorinated hydrocarbons.
FIG. 2 is the in situ construction of bone char catalysis Fe (OH) of example 2 2 A flow diagram of an environmental remediation process for removing chlorinated hydrocarbons.
FIG. 3 is a graph showing the time-dependent change of the residual trichloroethylene ratio of the BC/ferrous hydroxide mixed solution and the ferrous hydroxide solution.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
With reference to FIG. 1, the in-situ constructed bone charcoal provided by the present invention catalyzes Fe (OH) 2 An environmental remediation process for the removal of chlorinated hydrocarbons comprisingThe method comprises the following steps:
(1) Pulverizing animal bone waste, and purifying with N 2 Carrying out anaerobic pyrolysis for 2h at 800 ℃ in the atmosphere to obtain bone charcoal particles; then adding 1g of bone charcoal particles into 100mL of deoxidized deionized water, and uniformly mixing by ultrasonic to obtain a bone charcoal suspension with the concentration of 10g/L;
(2) Simulating an application environment: injecting 50 mu L of organic pollutant trichloroethylene stock solution with the concentration of 4mmol/L into a sample bottle which is added with 3mL of deionized water in advance, namely simulating the situation that the underground water is polluted by organic matters by taking the trichloroethylene stock solution as an example in the embodiment;
(3) And (3) sequentially adding 1mL of the bone charcoal suspension prepared in the step (1) and having the concentration of 10g/L, 3mL of a ferrous sulfate solution having the concentration of 0.2mol/L and 3mL of a sodium hydroxide solution having the concentration of 0.5mol/L into the sample bottle in the step (2), then covering the bottle with a bottle cap, and placing the bottle in a constant-temperature shaking incubator at 25 ℃ for reaction for one day.
Comparative example 1
(1) Simulating an application environment: the same as example 1;
(2) Adding 3mL of ferrous sulfate solution with the concentration of 0.2mol/L and 3mL of sodium hydroxide solution with the concentration of 0.5mol/L into the sample bottle in the step (1), then covering the bottle and placing the bottle in a constant temperature shaking incubator at 25 ℃ for reaction for one day.
Example 1 simulation of bone char catalysis Fe (OH) 2 The process of degrading the non-aqueous organic phase of trichloroethylene was tested by sampling at 1 hour (1 h), 2 hours (2 h), 4 hours (4 h), 8 hours (8 h), 10 hours (10 h) and using comparative example 1 as a control (comparative example 1 Fe (OH) in the degradation system) 2 In the same concentration as that of the charcoal-catalyzed Fe (OH) in example 1 2 Containing Fe (OH) 2 Same concentration), the residual amount of trichloroethylene (C) was measured, and the residual ratio of trichloroethylene = C/C 0 Calculating the residual rate of trichloroethylene, wherein C 0 The results are shown in figure 3 for the initial amount of trichloroethylene.
As can be seen from fig. 3: with the lapse of reaction time, the residual rate of the non-aqueous organic phase liquid trichloroethylene in the reaction system tends to decrease first and then to be balanced, while the residual rate of the non-aqueous organic phase liquid trichloroethylene in the ferric hydroxide solution alone is kept unchanged. In 14h of example 1, the removal rate of trichloroethylene is 100%.
Example 2
As shown in FIG. 2, the present invention provides another in situ-built bone charcoal catalyst Fe (OH) 2 The environment repairing method for removing chlorohydrocarbon is that firstly bone charcoal and Fe (OH) 2 Mixed preparation of bone charcoal catalyst Fe (OH) 2 Composite repairing material, then catalyzing the bone charcoal with Fe (OH) 2 The composite repairing material is poured into polluted soil and underground water, and specifically comprises the following steps:
(1) Pulverizing animal bone waste, and adding into N 2 Carrying out anaerobic pyrolysis for 2h at 800 ℃ in the atmosphere to obtain bone charcoal particles; then adding 1g of bone charcoal particles into 100mL of anaerobic deionized water, and uniformly mixing by ultrasonic to obtain a bone charcoal suspension with the concentration of 10g/L;
(2) Simulating an application environment: injecting 50 mu L of organic pollutant trichloroethylene stock solution with the concentration of 4mmol/L into a sample bottle which is added with 9mL of deionized water in advance, namely simulating the situation that the underground water is polluted by organic matters by taking the trichloroethylene-containing aqueous solution as an example in the embodiment;
(3) Taking 50mL of the bone char suspension prepared in the step (1) and having the concentration of 10g/L and 50mL of Fe with the concentration of 2mol/L under the conditions of introducing nitrogen and stirring 2 SO 4 The solution is evenly mixed with 50mL of NaOH solution with the concentration of 4mol/L to obtain the bone charcoal catalysis Fe (OH) 2 A composite repair material;
(4) Slowly catalyzing 1mL of the bone char prepared in the step (3) with Fe (OH) 2 Adding the composite repairing material into the sample bottle in the step (2), covering the bottle cap tightly, and placing the bottle cap in a constant-temperature shaking incubator at 25 ℃ for reaction for one day;
example 2 simulation of bone char catalysis Fe (OH) 2 The degradation process of the non-aqueous organic phase of trichloroethylene was measured by sampling at 1 hour (1 h), 2 hours (2 h), 4 hours (4 h), 8 hours (8 h) and 10 hours (10 h), respectively, and comparative example 1 was used as a control (comparative example 1 in which Fe (OH) was contained in the system) 2 In the same concentration as that of the charcoal catalyst Fe (OH) in example 2 2 Fe (OH) contained in composite repair material 2 Same concentration), the residual amount of trichloroethylene (C) was measured, and the residual ratio of trichloroethylene = C/C 0 Calculating the residual rate of trichloroethylene, wherein C 0 Is the initial amount of trichloroethylene.
The experimental result shows that the removal rate of the trichloroethylene is 87% in 10 h.
Example 3
The invention provides an in-situ constructed bone charcoal catalyst Fe (OH) 2 An environmental remediation process for removing chlorinated hydrocarbons comprising the steps of:
(1) Pulverizing animal bone waste, and adding into N 2 Carrying out anaerobic pyrolysis for 2h at 800 ℃ in the atmosphere to obtain bone charcoal particles; then adding the bone charcoal particles into 1mol/L HCl solution for extraction and acid washing, and carrying out solid-liquid separation; washing the bone charcoal particles subjected to acid washing with deionized water to be neutral, and drying for 11 hours at the temperature of 60 ℃ to obtain the bone charcoal particles subjected to acid treatment; adding 1g of acid-treated bone charcoal particles into 100mL of oxygen-free deionized water, and uniformly mixing by ultrasonic waves to obtain an acid-treated bone charcoal suspension with the concentration of 10g/L;
(2) Simulating an application environment: injecting 50 mu L of organic pollutant trichloroethylene stock solution with the concentration of 4mmol/L into a sample bottle which is added with 3mL of deionized water in advance, namely simulating the situation that the organic pollutant pollutes underground water by taking the trichloroethylene stock solution as an example in the embodiment;
(3) Sequentially adding 1mL of the acid-treated bone charcoal suspension with the concentration of 10g/L prepared in the step (1), 3mL of a ferrous sulfate solution with the concentration of 0.2mol/L and 3mL of a sodium hydroxide solution with the concentration of 0.5mol/L into the sample bottle in the step (2), then covering a bottle cap, and placing the bottle cap in a constant-temperature shaking incubator at 25 ℃ for reaction for one day;
the detection method is the same as that of example 1, and the experimental result shows that the removal rate of TCE is 98% within 12 h.
Example 4
The invention provides an in-situ constructed bone charcoal catalyst Fe (OH) 2 An environmental remediation process for removing chlorinated hydrocarbons comprising the steps of:
(1) Pulverizing animal bone waste, and adding into N 2 Carrying out anaerobic pyrolysis for 2h at 800 ℃ in the atmosphere to obtain bone charcoal particles; then grinding the bone charcoal particles for 3h by using a ball mill at the rotating speed of 250r/min to obtain nano bone charcoal (the particle size is 50-200 nm); adding 1g of nano bone charcoal into 100mL of deoxidized deionized water, and uniformly mixing by ultrasonic waves to obtain the product with the concentration of10g/L of nano bone charcoal suspension;
(2) Simulating an application environment: injecting 50 mu L of organic pollutant trichloroethylene stock solution with the concentration of 4mmol/L into a sample bottle which is added with 3mL of deionized water in advance, namely simulating the situation that the underground water is polluted by organic matters by taking the trichloroethylene stock solution as an example in the embodiment;
(3) And (3) sequentially adding 1mL of the nano bone charcoal suspension prepared in the step (1) and having the concentration of 10g/L, 3mL of a ferrous sulfate solution with the concentration of 0.2mol/L and 3mL of a sodium hydroxide solution with the concentration of 0.5mol/L into the sample bottle in the step (2), then covering the sample bottle, and placing the sample bottle in a constant-temperature shaking incubator at 25 ℃ for reaction for one day.
The detection method is the same as that of example 1, and the experimental result shows that the removal rate of TCE is 100% within 12 h.
Example 5
The invention provides in-situ constructed bone charcoal catalysis Fe (OH) 2 An environmental remediation process for removing chlorinated hydrocarbons comprising the steps of:
(1) Pulverizing animal bone waste, and adding into N 2 Carrying out anaerobic pyrolysis for 2h at 800 ℃ in the atmosphere to obtain bone charcoal particles; then weighing 2g of bone charcoal particles, adding the bone charcoal particles into 200mL of sodium carboxymethylcellulose solution with the content of sodium carboxymethylcellulose being 1 wt%, blowing nitrogen gas at the flow rate of 30mL/min for at least 1h under the condition of stirring, and carrying out solid-liquid separation; washing with deionized water to neutrality, and oven drying at 60 deg.C for 11 hr to obtain colloidized bone charcoal; adding 1g of colloidized bone charcoal into 100mL of deoxidized deionized water, and uniformly mixing by ultrasonic to obtain a colloidized bone charcoal suspension with the concentration of 10g/L;
(2) Simulating an application environment: injecting 50 mu L of organic pollutant trichloroethylene stock solution with the concentration of 4mmol/L into a sample bottle which is added with 3mL of deionized water in advance, namely simulating the situation that the organic pollutant pollutes underground water by taking the trichloroethylene stock solution as an example in the embodiment;
(3) Sequentially adding 1mL of the colloidal bone charcoal suspension prepared in the step (1) and having the concentration of 10g/L, 3mL of a ferrous sulfate solution with the concentration of 0.2mol/L and 3mL of a sodium hydroxide solution with the concentration of 0.5mol/L into the sample bottle in the step (1), then covering the sample bottle with a bottle cap, and placing the sample bottle in a constant-temperature shaking incubator at 25 ℃ for reaction for one day;
the detection method is the same as that of example 1, and the experimental result shows that the removal rate of TCE is 90% within 10 h.
Example 6
The invention provides an in-situ constructed bone charcoal catalyst Fe (OH) 2 An environmental remediation process for removing chlorinated hydrocarbons comprising the steps of:
(1) Pulverizing animal bone waste, and adding into N 2 Carrying out anaerobic pyrolysis for 2h at 800 ℃ in the atmosphere to obtain bone charcoal particles; then adding 1g of bone charcoal particles into 100mL of deoxidized deionized water, and uniformly mixing by ultrasonic to obtain a bone charcoal suspension with the concentration of 10g/L;
(2) Simulating an application environment: injecting 50 mu L of organic pollutant trichloroethylene stock solution with the concentration of 4mmol/L into a sample bottle which is added with 3mL of deionized water in advance, namely simulating the situation that the underground water is polluted by organic matters by taking the trichloroethylene stock solution as an example in the embodiment;
(3) And (3) sequentially adding 1mL of the bone charcoal suspension prepared in the step (1) and having the concentration of 10g/L, 3mL of a ferrous sulfate solution having the concentration of 0.01mol/L and 3mL of a sodium hydroxide solution having the concentration of 0.02mol/L into the sample bottle in the step (2), then covering the bottle with a bottle cap, and placing the bottle in a constant-temperature shaking incubator at 25 ℃ for reaction for one day.
The detection method is the same as that of example 1, and the experimental result shows that the removal rate of TCE is 98% within 10 h.
Example 7
Under the same conditions as in example 6, in which the sodium hydroxide concentration was 0.1mol/L, the test results showed that the removal rate of TCE was 83% within 10 hours.
Example 8
Other conditions were the same as in example 6, wherein the concentration of sodium hydroxide was 4mol/L and the concentration of ferrous sulfate was 0.2mol/L, and the experimental results showed that the removal rate of TCE was 85% within 7 hours.
The invention utilizes bone charcoal and ferrous salt solution to generate bone charcoal in situ in soil and underground water to catalyze Fe (OH) 2 The reaction system is used for carrying out reductive dechlorination degradation on the chlorinated hydrocarbons in the soil and underground water, the restoration system is simple and effective, and the treatment effect is obvious; chlorinated hydrocarbons, especially difficultly degradable vinyl chloride, can be rapidly dechlorinated and degradedThe removal efficiency is high; the method is used for in-situ repair, has good mass transfer effect, has no special limitation on the application method, and is easy to realize; meanwhile, the reaction process is less influenced by temperature and pH, and the application range is wide, so that the method has higher popularization value.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (2)
1. In-situ constructed bone charcoal catalysis Fe (OH) 2 An environmental remediation process for the removal of chlorinated hydrocarbons, characterized by comprising the steps of:
pouring the bone charcoal suspension, ferrous salt solution and alkali solution into a target polluted site, and constructing the bone charcoal catalysis Fe (OH) in situ 2 A reaction system for in-situ repair;
or mixing the bone charcoal suspension, ferrous salt solution and alkali solution to obtain Fe (OH) catalyzed by bone charcoal 2 A composite repair material; catalyzing the bone charcoal with Fe (OH) 2 The composite repairing material is poured into a target polluted site, and the bone charcoal catalysis Fe (OH) is constructed in situ 2 A reaction system for in-situ repair;
the concentration of the bone charcoal suspension is 0.1-10g/L;
the concentration of the ferrous salt solution is 0.01-4.95 mol/L;
the concentration of the alkali solution is 0.01-27.25 mol/L;
the mass ratio of the alkali solution to the bone charcoal suspension is (1-110): 1;
the molar ratio of the alkali solution to the ferrous salt in the ferrous salt solution is (1-40): 1;
the bone charcoal is obtained by crushing and carrying out anaerobic pyrolysis on animal bone waste;
the anaerobic pyrolysis condition is in N 2 Carrying out anaerobic pyrolysis for 1 to 3 hours at 300 to 1000 ℃ in the atmosphere;
optimizing the bone charcoal, and then mixing the bone charcoal with water to obtain a bone charcoal suspension;
the optimization treatment is at least one of nano treatment and gelatinization treatment;
when the optimization treatment is nano treatment, the method comprises the following steps: grinding the bone charcoal to obtain nano bone charcoal;
when the optimization treatment is a gelatinization treatment, the method comprises the following steps:
adding bone charcoal into sodium carboxymethylcellulose solution, and introducing N 2 Stirring for at least 1h; then solid-liquid separation, solid washing and drying are carried out to obtain the colloid bone char.
2. The in situ constructed bone char catalyst of claim 1, fe (OH) 2 The environmental remediation method for removing the chlorinated hydrocarbon is characterized by comprising the following steps:
when the optimization treatment is nano treatment, grinding for 2 to 5 hours at the rotating speed of 20 to 350r/min; the particle size of the nano bone charcoal is 50 to 500nm.
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