CN118023280A - Method and device for purifying contaminated soil - Google Patents
Method and device for purifying contaminated soil Download PDFInfo
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- CN118023280A CN118023280A CN202410436927.3A CN202410436927A CN118023280A CN 118023280 A CN118023280 A CN 118023280A CN 202410436927 A CN202410436927 A CN 202410436927A CN 118023280 A CN118023280 A CN 118023280A
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- manure
- fertilizer
- domesticated
- domestication
- soil
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- 239000002689 soil Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 64
- 210000003608 fece Anatomy 0.000 claims abstract description 97
- 239000010871 livestock manure Substances 0.000 claims abstract description 97
- 239000003337 fertilizer Substances 0.000 claims abstract description 29
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 23
- 231100000719 pollutant Toxicity 0.000 claims abstract description 23
- 150000001875 compounds Chemical class 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000000746 purification Methods 0.000 claims description 25
- 239000000126 substance Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000000575 pesticide Substances 0.000 claims description 5
- 239000003674 animal food additive Substances 0.000 claims description 4
- 239000003139 biocide Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 244000144972 livestock Species 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000000273 veterinary drug Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001569 carbon dioxide Substances 0.000 abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 6
- 244000005700 microbiome Species 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- BULVZWIRKLYCBC-UHFFFAOYSA-N phorate Chemical compound CCOP(=S)(OCC)SCSCC BULVZWIRKLYCBC-UHFFFAOYSA-N 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 2
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 2
- 229910001626 barium chloride Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003039 volatile agent Substances 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- GTKRFUAGOKINCA-UHFFFAOYSA-M chlorosilver;silver Chemical compound [Ag].[Ag]Cl GTKRFUAGOKINCA-UHFFFAOYSA-M 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 238000004895 liquid chromatography mass spectrometry Methods 0.000 description 1
- 238000001294 liquid chromatography-tandem mass spectrometry Methods 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000696 methanogenic effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004885 tandem mass spectrometry Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The application provides a method and a device for purifying polluted soil, comprising the following steps: domestication, namely performing domestication treatment on the manure to obtain a domesticated fertilizer; a mixing procedure, namely mixing the domesticated fertilizer and the polluted soil to obtain a mixture; a conversion step, wherein the domesticated fertilizer converts at least part of pollutants in the polluted soil into volatile compounds under the conditions that anaerobic and oxidation-reduction potential Eh is less than or equal to-100 mV; and a collecting step of collecting volatile compounds to obtain purified soil. In the method for purifying the polluted soil provided by the embodiment of the application, microorganisms in the manure can convert pollutants in the polluted soil into volatile compounds (mainly carbon dioxide and methane) under the conditions of anaerobic and oxidation-reduction potential Eh less than or equal to-100 mV through the domestication procedure, so that the probability of pollution of the pollutants in the soil to water resources is reduced, and the harm of the pollutants to the health of people is reduced.
Description
Technical Field
The application relates to the technical field of purification of polluted soil, in particular to a purification method and a purification device of the polluted soil.
Background
In life or industry, some chemicals used may pollute soil, and if not treated in time, the polluted soil may pollute water resources, so that physical health of people may be compromised. Therefore, there is a need to develop a method for purifying contaminated soil.
Disclosure of Invention
The first aspect of the present application provides a method for purifying contaminated soil, comprising:
Domestication, namely performing domestication treatment on the manure to obtain a domesticated fertilizer;
a mixing procedure, namely mixing the domesticated fertilizer and the polluted soil to obtain a mixture;
A conversion step, wherein the domesticated fertilizer converts at least part of pollutants in the polluted soil into volatile compounds under the conditions that anaerobic and oxidation-reduction potential Eh is less than or equal to-100 mV;
and a collecting step of collecting volatile compounds to obtain purified soil.
In the method for purifying the polluted soil provided by the embodiment of the application, microorganisms in the manure can convert pollutants in the polluted soil into volatile compounds (mainly carbon dioxide and methane) under the conditions of anaerobic and oxidation-reduction potential Eh less than or equal to-100 mV through the domestication procedure, so that the probability of pollution of the pollutants in the soil to water resources is reduced, and the harm of the pollutants to the health of people is reduced.
According to any embodiment of the first aspect of the present application, the acclimatization process includes:
And placing the manure into a preset condition for domestication treatment to obtain the domesticated fertilizer, wherein the preset condition comprises the following steps:
I) oxygen compression conditions;
Ⅱ）20℃-25℃；
III) any one of darkness and diffuse light;
IV) domesticating treatment is carried out for 20d-22d.
According to any embodiment of the first aspect of the application, the anaerobic condition is achieved by introducing nitrogen at a flow rate of 50mL/min-200 mL/min.
According to any embodiment of the first aspect of the application, in the acclimatizing step, the manure satisfies the following requirements:
i) manure comprises any one or more of cow manure and pig manure;
II) the dry matter mass content of the manure is m, and m is more than or equal to 3% and less than or equal to 12%;
III) the wet weight of the manure is 0.05kg-10kg;
IV) the pH of the manure is 4-7;
V) the manure comprises organic matters, wherein the mass content of the organic matters in the manure is 0.5% -5%.
According to any embodiment of the first aspect of the application, the contaminating material comprises any one or more of pesticides, veterinary drugs, feed additives, biocides and related chemicals for the construction of livestock houses.
According to any embodiment of the first aspect of the present application, in the mixing process, the mass ratio of the fertilizer to the contaminated soil is 1: (5-20).
According to any embodiment of the first aspect of the present application, in the mixing process, the mass concentration of the contaminant in the contaminated soil is 100mg/kg to 180mg/kg.
According to any embodiment of the first aspect of the application, in the conversion process, -450 mV.ltoreq.eh.ltoreq.200 mV; and/or the conversion time of the conversion process is 30d-100d.
According to any embodiment of the first aspect of the present application, before the acclimatization process, the purification method further includes:
and homogenizing, namely homogenizing the manure under anaerobic conditions.
In a second aspect, the present application provides a contaminated soil purification apparatus comprising:
The domestication unit is used for domesticating the manure to obtain a domesticated fertilizer;
A conversion unit for mixing the domesticated fertilizer and the polluted soil to obtain a mixture, and converting at least part of the pollutants in the polluted soil into volatile compounds under the conditions that anaerobic and oxidation-reduction potential Eh is less than or equal to-100 mV;
and a collecting unit for collecting the volatile compounds.
The foregoing description is only an overview of the technical solutions of the present specification, and may be implemented according to the content of the specification in order to make the technical means of the present specification more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present specification more clearly understood, the following detailed description of the present specification is given.
Detailed Description
The "range" disclosed herein is defined in terms of lower and upper limits, with the given range being defined by the selection of a lower and an upper limit, the selected lower and upper limits defining the boundaries of the particular range. Ranges that are defined in this way can be inclusive or exclusive of the endpoints, and any combination can be made, i.e., any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a particular parameter, it is understood that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if the minimum range values 1 and 2 are listed, and if the maximum range values 3,4 and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise indicated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed throughout, and "0-5" is simply a shorthand representation of a combination of these values. When a certain parameter is expressed as an integer of 2 or more, it is disclosed that the parameter is, for example, an integer of 2, 3,4, 5, 6, 7, 8,9, 10, 11, 12 or the like.
All embodiments of the application, as well as alternative embodiments, may be combined with each other to form new solutions, unless otherwise specified, and such solutions should be considered to be included in the disclosure of the application.
All technical features and optional technical features of the application may be combined with each other to form new technical solutions, unless specified otherwise, and such technical solutions should be considered as included in the disclosure of the application.
All the steps of the present application may be performed sequentially or randomly, preferably sequentially, unless otherwise specified. For example, the method comprises steps (a) and (b), meaning that the method may comprise steps (a) and (b) performed sequentially, or may comprise steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), may include steps (a), (c) and (b), may include steps (c), (a) and (b), and the like.
The terms "comprising" and "including" as used herein mean open ended or closed ended, unless otherwise noted. For example, the terms "comprising" and "comprises" may mean that other components not listed may be included or included, or that only listed components may be included or included.
The term "or" is inclusive in this application, unless otherwise specified. For example, the phrase "a or B" means "a, B, or both a and B. More specifically, either of the following conditions satisfies the condition "a or B": a is true (or present) and B is false (or absent); a is false (or absent) and B is true (or present); or both A and B are true (or present).
Unless otherwise indicated, terms used in the present application have well-known meanings commonly understood by those skilled in the art.
Unless otherwise indicated, the values of the parameters mentioned in the present application may be determined by various test methods commonly used in the art, for example, may be determined according to the test methods given in the embodiments of the present application.
The first aspect of the present application provides a method for purifying contaminated soil, comprising:
Domestication, namely performing domestication treatment on the manure to obtain a domesticated fertilizer;
a mixing procedure, namely mixing the domesticated fertilizer and the polluted soil to obtain a mixture;
A conversion step, wherein the domesticated fertilizer converts at least part of pollutants in the polluted soil into volatile compounds under the conditions that anaerobic and oxidation-reduction potential Eh is less than or equal to-100 mV;
and a collecting step of collecting volatile compounds to obtain purified soil.
In the method for purifying the polluted soil provided by the embodiment of the application, microorganisms in the manure can convert pollutants in the polluted soil into volatile compounds (mainly carbon dioxide and methane) under the conditions of anaerobic and oxidation-reduction potential Eh less than or equal to-100 mV through the domestication procedure, so that the probability of pollution of the pollutants in the soil to water resources is reduced, and the harm of the pollutants to the health of people is reduced.
In an embodiment of the application, the manure may be obtained from a manure storage tank, a pre-storage tank or a manure pit, wherein the storage device for storing the manure may be above ground or below ground. During the first six months of the purification treatment of the contaminated soil, the manure should not be exposed to the contaminating substances in the contaminated soil. Thus, there is a need to obtain information on the dosage of manure-producing animals (e.g. veterinary products or feed additives) within six months, as well as information on biocides or other chemicals of chemical use (e.g. disinfection or insect control) within animal houses. If necessary, the manure may be subjected to chemical residue analysis, in particular to the purification of farmland soil.
The collection, treatment and storage of manure is described in detail below.
Before the collection of the manure, the liquid manure can be mixed uniformly in the manure tank by means of equipment or external equipment arranged in the manure tank, and it is understood that the manure should be mixed for at least 1h before the collection of the manure, which is sufficient to homogenize the manure without being affected by the volume of the manure tank. For mixed use of various kinds of manure, such as pig manure and cow manure, it is considered that the pig manure is separated into different states faster than the cow manure, so that the cow manure can be mixed one day before collection, and the pig manure can be collected immediately after the mixing of the cow manure on the day of collection, so that the collected cow manure and the pig manure are mixed to be used as manure for purifying polluted soil. In collecting the mixed manure, a ladle with a long handle, for example, with a large beaker, may be used as a sampling vessel, from which manure is collected, the sampling vessel being filled up to about 75% of its volume and being closed. In a closed sampling vessel, microorganisms in the manure will continue to move and produce gaseous products, thus connecting a pipe with a fermentation sluice to the outlet of the sampling vessel.
The manure may be solid manure or liquid manure. In some alternative embodiments of the application, the manure is liquid manure and the liquid manure is freshly collected from a manure tank. In other embodiments, the manure may be stored for two months at 4 ℃ -20 ℃ (preferably at the test temperature), where anaerobic/methanogenic conditions are ensured.
In embodiments of the application, prior to decontaminating contaminated soil, it is desirable to acclimate the manure so that microorganisms in the manure can adapt to environmental and biological conditions and grow and reproduce in a shorter period of time.
In some alternative embodiments of the application, the acclimatization process comprises:
The method comprises the steps of putting manure into a preset condition for domestication treatment to obtain a domesticated fertilizer, wherein the preset condition comprises the following steps:
I) oxygen compression conditions;
Ⅱ）20℃-25℃；
III) any one of darkness and diffuse light;
IV) domesticating treatment is carried out for 20d-22d.
In the embodiment, the anaerobic condition is realized by introducing nitrogen at a flow rate of 50-200 mL/min.
In embodiments of the application, the selection of suitable manure and its associated matrix parameters, including dry matter mass, wet weight, pH and organic matter contained therein, can help to enhance the decontamination effect.
In some alternative embodiments of the application, in the domestication process, the manure comprises any one or more of cow manure and pig manure. These manure materials are easy to obtain, so that the purification cost is reduced.
In other alternative embodiments of the application, the dry matter mass content of the manure is m, and 3% m.ltoreq.12%.
In some alternative embodiments of the application, the wet weight of the manure is between 0.05kg and 10kg.
In some alternative embodiments of the application, the pH of the manure is between 4 and 7.
In some alternative embodiments of the application, the manure comprises organic matter, the mass content of the organic matter in the manure being between 0.5% and 5%.
In some alternative embodiments of the application, the contaminating material includes any one or more of pesticides, veterinary drugs, feed additives, biocides, and related chemicals used to construct livestock houses. The purification method provided by the embodiment of the application can convert the pollutants in the soil into carbon dioxide and methane, reduce the residue of the pollutants in the soil, and further reduce the occurrence of transfer of the pollutants in the soil to water resources, thereby reducing the damage to the health of people.
In the above embodiments, the contaminants in the contaminated soil may be measured using instruments well known in the art, such as gas chromatography/mass spectrometry (GC-MS), liquid chromatography/mass spectrometry (LC-MS), liquid chromatography/tandem mass spectrometry (LC-MS/MS), NMR, and the like.
In some alternative embodiments of the application, in the mixing process, the mass ratio of the fertilizer to the contaminated soil is 1: (5-20).
In some alternative embodiments of the application, the mass concentration of the contaminant in the contaminated soil during the mixing process is from 100mg/kg to 180mg/kg.
In some alternative embodiments of the application, in the conversion process, -450 mV.ltoreq.Eh.ltoreq.200 mV.
In the above conversion procedure, the redox potential can be measured using instruments and methods well known in the art, for example, using an electrochemical cell, wherein the electrochemical cell is a reference electrode (e.g., a cell composed of a silver-silver chloride electrode (ag+/AgCl) and an electrode to be measured (e.g., a platinum electrode), the standard hydrogen electrode is a reference electrode for the redox reaction potential, the electrode potential is defined as zero, and the electrode to be measured is an electrode whose potential needs to be measured.
In some alternative embodiments of the application, the conversion time of the conversion process is from 30d to 100d.
In some alternative embodiments of the application, the purification method further comprises, prior to the acclimation procedure:
and homogenizing, namely homogenizing the manure under anaerobic conditions.
In a second aspect, the present application provides a contaminated soil purification apparatus comprising:
The domestication unit is used for domesticating the manure to obtain a domesticated fertilizer;
A conversion unit for mixing the domesticated fertilizer and the polluted soil to obtain a mixture, and converting at least part of the pollutants in the polluted soil into volatile compounds under the conditions that anaerobic and oxidation-reduction potential Eh is less than or equal to-100 mV;
And a collecting unit for collecting the volatile compounds. The present disclosure is more particularly described in the following embodiments, which are intended as illustrative only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages and ratios reported in the following embodiments are on a mass basis, and all reagents used in the embodiments are commercially available or synthetically obtained according to conventional methods and can be used directly without further treatment, as well as the instruments used in the embodiments are commercially available.
Example 1
The embodiment provides a method for purifying contaminated soil, which comprises the following steps:
a domestication procedure, namely placing 50g of pig manure into darkness, anaerobism and 25 ℃ for 20d of domestication treatment to obtain a domestication fertilizer;
Mixing the domesticated fertilizer and 1000g of polluted soil to obtain a mixture, wherein the polluted soil contains 150.25mg/kg of organic pesticide, namely, phorate;
A conversion procedure, wherein the mixture converts partial pollutant in the polluted soil into volatile compound through 35d of domesticated fertilizer under the conditions of anaerobic and oxidation-reduction potential Eh of minus 350 mV;
and a collecting step of collecting volatile compounds to obtain purified soil.
The content of the phorate in the purified soil is 10.12mg/kg through detection.
Example 2
The same purification method as in example 1 was employed, except that: 80g of pig manure is added.
Example 3
The same purification method as in example 1 was employed, except that: 100g of pig manure is added.
Example 4
The same purification method as in example 3 was employed, except that: the concentration of the organic pesticide, the phorate, in the polluted soil is 170.37mg/kg.
Example 5
The same purification method as in example 3 was employed, except that: eh is-400 mV.
Example 6
The same purification method as in example 3 was employed, except that: the manure is cow manure.
Example 7
The same purification method as in example 3 was employed, except that: eh is-200 mV.
Example 8
The same purification method as in example 3 was employed, except that: the manure is a mixed fertilizer of cow manure and pig manure, wherein the cow manure is 50g, and the pig manure is 50g.
Comparative example 1
The difference from example 1 is that: no manure is added.
Comparative example 2
The difference from example 1 is that: pig manure was autoclaved as a sterile control.
Comparative example 3
The difference from example 1 is that: eh is-50 mV.
Test part
(1) Volatile compound detection
(A) The collected volatile compounds are introduced into a barium chloride solution containing a CO 2 absorbent, and if a precipitate is formed, this indicates that the fertilizer converts the contaminant material into carbon dioxide.
(B) The gas after passing through the barium chloride solution is contacted with copper oxide and reacts at 800-850 ℃, and the gas product generated after the reaction is introduced into the BaCl 2 solution, so that the generation of precipitation can be observed.
Table 1 lists the detection results before and after the purification of examples 1 to 7, comparative examples 1 to 2.
TABLE 1
According to Table 1, in the method for purifying contaminated soil provided by the embodiment of the application, microorganisms in manure can convert pollutants in the contaminated soil into volatile compounds (mainly carbon dioxide and methane) under anaerobic and oxidation-reduction potential Eh less than or equal to-100 mV through an acclimation procedure, so that the content of pollutants in the soil is reduced, the probability of pollution to water resources is reduced, and the harm to the health of people is reduced.
Finally, it should be noted that: the above experimental examples are only for illustrating the technical scheme of the present application, but not for limiting the same; although the present application has been described in detail with reference to the foregoing experimental examples, it will be understood by those skilled in the art that: the technical scheme recorded in each experimental example can be modified or part or all of the technical characteristics can be replaced equivalently; these modifications or substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of each experimental example of the present application.
Claims (10)
1. A method for decontaminating contaminated soil, comprising:
Domestication, namely performing domestication treatment on the manure to obtain a domesticated fertilizer;
Mixing the domesticated fertilizer and the polluted soil to obtain a mixture;
a conversion step, wherein the domesticated fertilizer converts at least part of pollutants in the polluted soil into volatile compounds under the conditions of anaerobic and oxidation-reduction potential Eh less than or equal to-100 mV;
and a collecting step of collecting the volatile compounds to obtain purified soil.
2. The purification method according to claim 1, wherein the domestication step comprises:
And placing the manure into a preset condition for domestication treatment to obtain the domesticated fertilizer, wherein the preset condition comprises the following steps:
I) oxygen compression conditions;
Ⅱ）20℃-25℃；
III) any one of darkness and diffuse light;
IV) the domestication treatment time is 20d-22d.
3. The method of claim 2, wherein the anaerobic conditions are achieved by introducing nitrogen at a flow rate of 50mL/min to 200 mL/min.
4. A purification method according to any one of claims 1-3, characterized in that in the acclimatization process the manure fulfils the following requirements:
i) the manure comprises any one or more of cow manure and pig manure;
II) the dry matter mass content of the manure is m, and m is more than or equal to 3% and less than or equal to 12%;
III) the wet weight of the manure is 0.05kg-10kg;
IV) the pH of the manure is 4-7;
V) the manure comprises organic matters, wherein the mass content of the organic matters in the manure is 0.5% -5%.
5. A purification method according to any one of claims 1-3, wherein the contaminating material comprises any one or more of pesticides, veterinary drugs, feed additives, biocides and related chemicals for use in the construction of livestock houses.
6. The method according to claim 1, wherein in the mixing step, a mass ratio of the domesticated fertilizer to the contaminated soil is 1: (5-20).
7. The method according to claim 1, wherein in the mixing step, the mass concentration of the pollutant in the polluted soil is 100mg/kg to 180mg/kg.
8. The purification process according to claim 1, wherein, -450 mV.ltoreq.eh.ltoreq.200 mV in the conversion step;
and/or the conversion time of the conversion process is 30d-100d.
9. The purification method according to claim 1, characterized in that before the domestication process, the purification method further comprises:
and homogenizing, namely homogenizing the manure under anaerobic conditions.
10. A contaminated soil purifying apparatus, comprising:
The domestication unit is used for domesticating the manure to obtain a domesticated fertilizer;
a conversion unit for mixing the domesticated fertilizer and the polluted soil to obtain a mixture, and converting at least part of the pollutants in the polluted soil into volatile compounds under the conditions that anaerobic and oxidation-reduction potential Eh is less than or equal to-100 mV;
And the collecting unit is used for collecting the volatile compounds.
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| CN202410436927.3A CN118023280B (en) | 2024-04-12 | 2024-04-12 | Method and device for purifying contaminated soil |
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| CN202410436927.3A CN118023280B (en) | 2024-04-12 | 2024-04-12 | Method and device for purifying contaminated soil |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173835A (en) * | 1995-09-25 | 1998-02-18 | 曾尼卡有限公司 | Anaerobic/aerobic decontamination of DDT contaminated soil by repeated anaerobic/aerobic treatments |
| CN1173836A (en) * | 1995-09-25 | 1998-02-18 | 曾尼卡有限公司 | Compost decontamination of DDT contaminated soil |
| CN1235566A (en) * | 1996-11-01 | 1999-11-17 | 曾尼卡有限公司 | Compost decontamination of soil contaminated with chlorinated toxicants |
| WO1999059743A1 (en) * | 1998-05-18 | 1999-11-25 | Stauffer Management Company | Decontamination of soil contaminated with hcb |
| US6083738A (en) * | 1996-11-01 | 2000-07-04 | Zeneca, Inc. | Compost decontamination of soil contaminated with PCB using aerobic and anaerobic microorganisms |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1173835A (en) * | 1995-09-25 | 1998-02-18 | 曾尼卡有限公司 | Anaerobic/aerobic decontamination of DDT contaminated soil by repeated anaerobic/aerobic treatments |
| CN1173836A (en) * | 1995-09-25 | 1998-02-18 | 曾尼卡有限公司 | Compost decontamination of DDT contaminated soil |
| CN1235566A (en) * | 1996-11-01 | 1999-11-17 | 曾尼卡有限公司 | Compost decontamination of soil contaminated with chlorinated toxicants |
| US6083738A (en) * | 1996-11-01 | 2000-07-04 | Zeneca, Inc. | Compost decontamination of soil contaminated with PCB using aerobic and anaerobic microorganisms |
| WO1999059743A1 (en) * | 1998-05-18 | 1999-11-25 | Stauffer Management Company | Decontamination of soil contaminated with hcb |
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