CN115634917B - Restoration method for dye-contaminated soil - Google Patents
Restoration method for dye-contaminated soil Download PDFInfo
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- CN115634917B CN115634917B CN202211100793.5A CN202211100793A CN115634917B CN 115634917 B CN115634917 B CN 115634917B CN 202211100793 A CN202211100793 A CN 202211100793A CN 115634917 B CN115634917 B CN 115634917B
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- 239000002689 soil Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000002699 waste material Substances 0.000 claims abstract description 68
- 239000000843 powder Substances 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000003213 activating effect Effects 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 38
- 239000000975 dye Substances 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 230000004913 activation Effects 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 15
- 239000002351 wastewater Substances 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 230000005284 excitation Effects 0.000 claims description 14
- 239000002893 slag Substances 0.000 claims description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 12
- 238000005554 pickling Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000011363 dried mixture Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000011268 mixed slurry Substances 0.000 claims description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000002910 solid waste Substances 0.000 claims description 5
- 229910052902 vermiculite Inorganic materials 0.000 claims description 5
- 235000019354 vermiculite Nutrition 0.000 claims description 5
- 239000010455 vermiculite Substances 0.000 claims description 5
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 239000011499 joint compound Substances 0.000 claims description 4
- 238000005067 remediation Methods 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 4
- 238000010790 dilution Methods 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 3
- 230000002542 deteriorative effect Effects 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 239000000985 reactive dye Substances 0.000 claims description 2
- 238000009736 wetting Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 3
- 230000001953 sensory effect Effects 0.000 abstract description 2
- 238000001994 activation Methods 0.000 description 16
- 238000012360 testing method Methods 0.000 description 14
- 150000003839 salts Chemical class 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- 230000035699 permeability Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 230000008439 repair process Effects 0.000 description 8
- 230000009467 reduction Effects 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005056 compaction Methods 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 230000006870 function Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- -1 persulfate compound Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
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- 238000004064 recycling Methods 0.000 description 1
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Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for repairing dye-contaminated soil, which mainly comprises the following steps: the method comprises the following steps of (1) pretreating and activating the waste warm paste powder; (2) the water content of the polluted soil is adjusted to the optimal water content; (3) The activated and excited waste warm patch powder and the pretreated dye polluted soil are uniformly mixed; and (4) compacting and curing the mixed dye polluted soil. The method can obviously improve the chromaticity of pore water of dye-polluted soil, reduce the salinity of the soil and increase the sensory acceptability of the soil.
Description
Technical Field
The invention relates to the fields of environmental engineering, geotechnical engineering, groundwater science and engineering and the like, in particular to a method for repairing dye-polluted soil.
Background
At present, the treatment technology and the medicament for medium-pollution wastewater in dye and downstream industries are more, such as activated persulfate oxidation, biochar repair and the like. However, the method is difficult to directly use for restoring dye-contaminated soil, and the limitations are shown in the following aspects: (1) The salt content of the polluted soil can be obviously increased by activating persulfate oxidation, and secondary pollution is aggravated; (2) The activated carbon has low repairing and adsorbing efficiency, and is difficult to meet the repairing requirement; (3) The permeability coefficient of the restored soil is larger, the dye mobility is obvious, and the environmental impact on surrounding soil or water is bad. Therefore, there is a need to develop innovative methods for restoring contaminated soil in order to fully achieve efficient restoration of contaminated soil in dye-related contaminated sites.
The demand of the warm paste on the world is larger and larger, 100 tens of thousands of tablets are produced in daily life in China nowadays, and the annual sales of the paste in the whole country is about 2 hundred million tablets. The warm paste contains iron powder, activated carbon, vermiculite and other auxiliary materials (inorganic salt, water and the like), and the content of basic iron powder is 68-85%. In the using process of the heating paste, the reaction is mainly that iron powder reacts with oxygen and water vapor in the air to release heat. The waste warm paste powder is mainly a mixture of ferric oxide, active carbon, vermiculite and the like. When the warm patch is improperly stored, the warm patch can also be deteriorated after being contacted with humid air, and the reaction process and the reaction products are the same as those of normal use. Based on the thought of high-value recycling of wastes, the waste warm paste powder is applied to the remediation of polluted soil, and has remarkable economic and environmental benefits.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for repairing dye-contaminated soil, which can meet the requirements of dye production and dye-contaminated soil repair in downstream industries.
In order to solve the technical problems, the invention adopts the following technical scheme:
the remediation method of the dye-contaminated soil is characterized by comprising the following steps of:
(1) Pretreating, activating and exciting the waste warm paste powder;
(2) Adjusting the water content of the dye polluted soil to the optimal water content;
(3) Uniformly mixing the waste heating paste powder activated and excited in the step (1) with the dye-contaminated soil treated in the step (2) to obtain mixed dye-contaminated soil;
(4) Compacting the mixed dye contaminated soil obtained in the step (3) to 90% -100% of the maximum dry density;
(5) Curing the mixed dye polluted soil compacted in the step (4) for 7-60 days at the temperature of 15-35 ℃ and the humidity of 50-100% to obtain the repaired soil.
Wherein the dye is a reactive dye.
Wherein, the chromaticity of the leaching solution of the dye-polluted soil is tested by adopting a dilution multiple method, and the chromaticity is 300-1000 times. The preferred leachate chromaticity is 750 times.
The waste warm paste powder is solid waste obtained by using or wetting and deteriorating, is a mixture of ferric oxide, active carbon and vermiculite, and comprises the following components in percentage by mass of 30-55%, 25-45% and 15-25% respectively. The preferred mass percentages are 45%, 35% and 20%, respectively.
Wherein in the step (1), the activation excitation comprises the following steps:
(1a) Drying the waste warm paste powder at the temperature of 90-105 ℃ until the water content is no longer changed, grinding and sieving with a 200-mesh sieve;
(1b) Mixing the waste warm paste powder obtained in the step (1 a) with iron rust pickling wastewater on the surface of steel, wherein the mass ratio of the waste warm paste powder to the iron rust pickling wastewater is 1:1-1:3, and obtaining mixed slurry;
(1c) Drying the mixed slurry obtained in the step (1 b) at a temperature of 45-65 ℃ to obtain a dried mixture;
(1d) Burning the dried mixture obtained in the step (1 c) for 0.5-1 hour at the temperature of 650-850 ℃ under the protection of nitrogen to obtain burnt waste warm paste powder;
(1e) Mixing the burned waste warm paste powder obtained in the step (1 d), persulfate and aluminum-containing waste residues, wherein the mass percentages of the persulfate, the persulfate and the aluminum-containing waste residues are respectively 50-75%, 10-25% and 15-35%, so as to obtain the activated and excited waste warm paste powder.
Specifically, in the step (1 a), the waste warm paste powder is dried at the temperature of 90-105 ℃ until the water content is not changed, wherein the drying temperature is preferably 105 ℃ and the drying time is 0.5 hour.
Specifically, in the step (1 b), the pH value of the iron and steel surface rust pickling wastewater is 3.5-6.5, and the iron content is 300-30000 mg/L. Preferably, the pH is 4.13 and the iron content is 17932mg/L.
Specifically, in the step (1 b), the solid-liquid mass ratio of the waste warm paste powder to the iron and steel surface rust pickling wastewater is preferably 1:2.
The activation process can remarkably improve the iron element content of the waste warm paste powder and adjust the element components of the waste warm paste powder; meanwhile, the surface characteristics of the activated carbon in the waste warm paste powder can be obviously increased, and the adsorption capacity of dye is enhanced.
Specifically, in the step (1 c), the mixed slurry is dried at a temperature of 45-65 ℃, preferably at a drying temperature of 65 ℃.
Specifically, in the step (1 d), the dried mixture is burned for 0.5 to 1 hour at the temperature of 650 to 850 ℃ under the protection of nitrogen, and preferably, the dried mixture is burned for 1 hour at the temperature of 750 ℃ under the protection of nitrogen.
Specifically, in the step (1 e), the persulfate is any one or a combination of two of sodium persulfate and potassium persulfate. Preferably, the persulfate is sodium persulfate.
Specifically, in the step (1 e), the aluminum-containing waste slag is any one or a combination of more than one of red mud, fly ash, steel slag and slag. Preferably, the aluminum-containing waste slag is a mixture containing red mud, fly ash and steel slag, and the mass ratio is 1:1:1.
The aluminum-containing waste residue has the main functions of: 1) Changing the pH environment of the soil, and improving the oxidation capacity of persulfate; 2) Generating a gelled product, and increasing the high-efficiency adsorption fixation of sulfate and dye; 3) The generated product can fill soil pores, obviously increase the compactness of soil and reduce the migration capability of pollutants.
Specifically, in the step (1 e), the burned waste warm paste powder, persulfate and aluminum-containing waste residues are mixed, wherein the mass percentages of the burned waste warm paste powder, persulfate and aluminum-containing waste residues are respectively 50-75%, 10-25% and 15-35%. Preferably, the mass percentages of the three components are 60%, 20% and 20% respectively.
In the step (2), the optimal water content is obtained through a compaction test, and then the water content of the polluted soil is adjusted to the optimal water content through airing or adding water.
In the step (3), the activated and stimulated waste warm patch accounts for 2-13% of the dry weight of the polluted soil. Preferably, the activated and excited waste warm patch accounts for 8% of the dry weight of the polluted soil by mass.
In the step (4), the mixed dye polluted soil is compacted to 90% -100% of the maximum dry density. Preferably 98% of the maximum dry density.
In the step (5), the compacted mixed dye polluted soil is cured for 7-60 days under the conditions of 15-35 ℃ and 50-100% of humidity. Preferably, the compacted mixed dye contaminated soil is cured for 28 days at 25 ℃ and 98% humidity.
The beneficial effects are that: compared with the prior art, the invention has the following advantages:
(1) The method disclosed by the invention can obviously reduce the salinity content of the polluted soil and the chromaticity of soil pore water, and improves the sensory acceptability of the soil.
(2) The method disclosed by the invention can obviously reduce the permeability of polluted soil and reduce the migration capacity of dye in the soil.
(3) The invention discloses a method for treating polluted soil by utilizing solid wastes such as waste warm paste powder, aluminum-containing waste residues and iron rust pickling wastewater on the surface of steel, and the double purposes of waste utilization and pollution control of industrial solid wastes and industrial wastewater and polluted soil restoration are realized.
Drawings
The foregoing and/or other advantages of the invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Fig. 1: soil penetration maps in example 1, comparative example 2, comparative example 3.
Detailed Description
The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are commercially available.
The repair material waste warm patch powder in the following embodiment is solid waste obtained after the use of a commercial warm patch or after damp deterioration.
The persulfates described in the examples below are all commercial technical grade products.
In the following examples, the red mud was taken from a certain alumina production yard, piled up for less than 7 days, and directly used after air-dried. The steel slag and slag are taken from a steel plant and the stacking time is less than 7 days. Grinding the steel slag after the hot disintegrating treatment, and sieving the steel slag with a 200-mesh sieve; the slag is ground and screened by a 200-mesh sieve after being subjected to water quenching treatment.
The iron and steel surface rust pickling wastewater in the following examples was taken from a wastewater collection tank of an auto-parts surface treatment plant, and stored in the wastewater collection tank for less than 3 days, and had a pH of 4.13 and an iron content of 17932mg/L.
The contents and amounts described in the examples below are mass contents unless otherwise specified.
Example 1
1. Activation excitation of waste warm paste powder
Drying waste warm paste powder containing iron oxide, active carbon and vermiculite in mass percent of 45%, 35% and 20% at 105 ℃ for 0.5 hour until the water content obtained by 5 minutes test is unchanged, grinding the powder, sieving the powder by a 200-mesh sieve, and mixing the powder with iron rust pickling wastewater (taken from a wastewater collecting tank of an automobile accessory surface treatment workshop) with pH of 4.13 and iron content of 17932mg/L according to a solid-liquid mass ratio of 1:2 to obtain mixed slurry. The resulting mixed slurry was then dried at a temperature of 65 ℃ to obtain a dried mixture. And then burning the dried mixture for 1 hour at 750 ℃ under the protection of nitrogen for high-temperature activation to obtain the burnt waste warm paste powder. And finally, uniformly mixing the obtained burnt waste warm paste powder with sodium persulfate and aluminum-containing waste residues (the mixture of red mud, fly ash and steel slag in a mass ratio of 1:1:1) according to 60%, 20% and 20% by mass percent to obtain the activated and excited waste warm paste powder.
2. Remediation of dye contaminated soil
Collecting the residual dye polluted soil of a dye production enterprise, and referring to a compaction test in geotechnical test method Standard (GB/T50123-2019), testing that the optimal water content and the maximum dry density of the dye polluted soil are 23.1% and 1.69g/cm respectively 3 The method comprises the steps of carrying out a first treatment on the surface of the Refer to the ease in the geotechnical test method Standard (GB/T50123-2019)Total dissolved salt determination (mass method) test the total dissolved salt of the dye contaminated soil was 2573mg/kg. The water content of the dye-contaminated soil is adjusted to 23.1% by adding deionized water. Soil samples were prepared with reference to the penetration test in ASTM D5084-2016 and tested for a permeability coefficient of 3.62X10 for dye contaminated soil (dry density 98% of maximum dry density) -6 cm/s, and the chromaticity of the dye-contaminated soil leachate was 750 times as measured according to the chromaticity test of the dilution method for determination of Water quality chromaticity (HJ 1182-2021).
And uniformly mixing the activated and excited waste warm patch accounting for 8% of the dry weight of the dye-contaminated soil with the adjusted water content of 23.1%, and compacting to 98% of the maximum dry density. Curing the compacted mixed dye polluted soil for 28 days at the temperature of 25 ℃ and the humidity of 98%.
Example 2
The waste warm patch is directly mixed with dye-polluted soil without pretreatment and activation excitation, and the mixing amount accounts for 8% of the dry weight of the polluted soil. The other steps were the same as in example 1.
Example 3
The weight percentage of the waste warm patch powder added with the activation excitation is 1% of the dry weight of the polluted soil. The other steps were the same as in example 1.
Example 4
The weight percentage of the waste warm patch powder added with the activation excitation is 2% of the dry weight of the polluted soil. The other steps were the same as in example 1.
Example 5
The weight percentage of the waste warm patch powder added with the activation excitation is 13% of the dry weight of the polluted soil. The other steps were the same as in example 1.
Example 6
The weight percentage of the waste warm patch powder added with the activation excitation is 16% of the dry weight of the polluted soil. The other steps were the same as in example 1.
Example 7
The activation and excitation step of the waste warm paste powder is not performed with the iron and steel surface rust pickling wastewater treatment step. The other steps were the same as in example 1.
Example 8
The waste warm paste powder is not subjected to a high-temperature activation step in the activation and excitation step. The other steps were the same as in example 1.
Example 9
The activation and excitation step of the waste warm patch does not contain a persulfate compound step. The other steps were the same as in example 1.
Example 10
The activation and excitation step of the waste warm paste powder does not contain an aluminum-containing waste residue compounding step. The other steps were the same as in example 1.
Example 11
The dye-contaminated soil collected in a workshop of textile enterprises is tested to have optimal water content and maximum dry density of 24.27% and 1.71g/cm respectively by reference to compaction test in geotechnical test method Standard (GB/T50123-2019) 3 The method comprises the steps of carrying out a first treatment on the surface of the Reference "geotechnical test method Standard" (GB/T50123-2019) test the total amount of soluble salts in dye contaminated soil was 1570mg/kg. Soil samples were prepared with reference to the penetration test in ASTM D5084-2016 and tested for a permeability coefficient of 5.07X 10 for dye contaminated soil (dry density 98% of maximum dry density) -6 cm/s, and the chromaticity of the dye-contaminated soil leachate was tested to be 100 times in accordance with the chromaticity test of the method for determining dilution times for Water quality chromaticity (HJ 1182-2021). Other repair and related test procedures were the same as in example 1.
Comparative example 1
No repair material was added. The relevant parameter test procedure was the same as in example 1.
Comparative example 2
The used repair material waste warm paste powder is replaced by the commercial cement. The mixing amount accounts for 8% of the dry weight of the polluted soil. The other steps were the same as in example 1.
Comparative example 3
The used repair material waste warm paste powder is replaced by commercial activated carbon. The mixing amount accounts for 8% of the dry weight of the polluted soil. The other steps were the same as in example 1.
The test results of the above examples and comparative examples are shown in table 1:
and obtaining relevant parameters of the soil and the leaching liquid according to test standards. For convenience of comparison, the reduction rate of the relevant parameters is calculated. Wherein:
chromaticity reduction rate= (original contaminated soil chromaticity-restored soil chromaticity)/original contaminated soil chromaticity x 100%;
permeability coefficient decrease rate = lg (original contaminated soil permeability coefficient/restored soil permeability coefficient);
soluble salt total reduction rate = (soluble salt total amount of original contaminated soil-soluble salt total amount of restored soil)/soluble salt total amount of original contaminated soil x 100%.
Table 1 test results
| Numbering device | Chromaticity reduction ratio (%) | Permeability coefficient reduction rate | Soluble salt total reduction (%) |
| Example 1 | 97.33 | 2.93 | 82.01 |
| Example 2 | 26.67 | 0.23 | -1.79 |
| Example 3 | 20.00 | 0.04 | 6.37 |
| Example 4 | 33.33 | 0.51 | 22.15 |
| Example 5 | 99.33 | 3.09 | 82.43 |
| Example 6 | 99.33 | 3.13 | 75.32 |
| Example 7 | 33.33 | 2.40 | 22.93 |
| Example 8 | 46.67 | 2.62 | -4.39 |
| Example 9 | 33.33 | 2.80 | 49.59 |
| Example 10 | 20.00 | 0.08 | 10.84 |
| Example 11 | 95.00 | 3.01 | 84.97 |
| Comparative example 1 | 0.00 | 0.00 | 0.00 |
| Comparative example 2 | 6.67 | 0.98 | 6.30 |
| Comparative example 3 | 13.33 | -0.49 | 2.95 |
As can be seen from the embodiment 1 and the comparative embodiment 1, the technical scheme of the invention can obviously reduce the chromaticity of the leaching solution of the polluted soil, the permeability coefficient of the soil and the content of soluble salt.
From example 1 and example 2, it is known that the activation excitation treatment can significantly increase the restoration effect of the technical scheme of the invention on contaminated soil.
As can be seen from examples 1, 3, 4, 5 and 6, the mixing amount of the activated waste heat patch has a remarkable effect on the restoration effect of the polluted soil, and when the mixing amount is less than or equal to 2%, the restoration effect is not obvious, and when the mixing amount is more than or equal to 13%, the restoration effect is still improved, but the improvement efficiency is not obvious, and the economic benefit is not high. In addition, when the mixing amount of the waste heat patch activated and excited is too high (example 6), there is a decrease in the rate of decrease in the total amount of soluble salt in the restored soil, that is, the effect of improving the total amount of soluble salt is decreased.
From examples 7, 8, 9 and 10, the iron and steel surface rust pickling wastewater step, the high-temperature firing step, the persulfate compounding step and the aluminum-containing waste residue compounding step in the activation and excitation treatment process can all obviously improve the restoration effect of the technical scheme of the invention on the polluted soil.
As can be seen from example 11, the technical scheme of the invention also has a remarkable repairing effect on the polluted soil of textile enterprises.
As can be seen from the examples 1, 2 and 3, the technical scheme of the invention can obviously reduce the chromaticity of the leachate of the polluted soil, the permeability coefficient of the soil and the content of soluble salt, and has obvious technical advantages as compared with the traditional cement repair materials and activated carbon adsorption materials.
The invention provides a method for repairing dye-contaminated soil, and the method and the way for realizing the technical scheme are numerous, and the method and the way are only the preferred embodiments of the invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (2)
1. The remediation method of the dye-contaminated soil is characterized by comprising the following steps of:
(1) Pretreating, activating and exciting the waste warm paste powder;
(2) Adjusting the water content of the dye polluted soil to the optimal water content;
(3) Uniformly mixing the waste heating paste powder activated and excited in the step (1) with the dye-contaminated soil treated in the step (2) to obtain mixed dye-contaminated soil;
(4) Compacting the mixed dye contaminated soil obtained in the step (3) to 90% -100% of the maximum dry density;
(5) Curing the mixed dye polluted soil compacted in the step (4) for 7-60 days at the temperature of 15-35 ℃ and the humidity of 50-100% to obtain the repaired soil;
wherein the dye is a reactive dye;
wherein the dye-contaminated soil is dye-contaminated soil excavated in situ;
the waste warm paste powder is solid waste obtained by using or wetting and deteriorating, is a mixture of ferric oxide, active carbon and vermiculite, and comprises the following components in percentage by mass of 30-55%, 25-45% and 15-25% respectively;
wherein in the step (1), the activation excitation comprises the following steps:
(1a) Drying the waste warm paste powder at the temperature of 90-105 ℃ until the water content is no longer changed, grinding and sieving with a 200-mesh sieve;
(1b) Mixing the waste warm paste powder obtained in the step (1 a) with iron rust pickling wastewater on the surface of steel, wherein the mass ratio of the waste warm paste powder to the iron rust pickling wastewater is 1:1-1:3, and obtaining mixed slurry;
(1c) Drying the mixed slurry obtained in the step (1 b) at a temperature of 45-65 ℃ to obtain a dried mixture;
(1d) Burning the dried mixture obtained in the step (1 c) for 0.5-1 hour at the temperature of 650-850 ℃ under the protection of nitrogen to obtain burnt waste warm paste powder;
(1e) Mixing the burned waste warm paste powder obtained in the step (1 d) with persulfate and aluminum-containing waste residues, wherein the mass percentages of the persulfate, the aluminum-containing waste residues and the aluminum-containing waste residues are respectively 50-75%, 10-25% and 15-35%, so as to obtain activated and excited waste warm paste powder;
specifically, in the step (1 b), the pH value of the iron and steel surface rust pickling wastewater is 3.5-6.5, and the iron content is 300mg/L-30000mg/L;
specifically, in the step (1 e), the persulfate is any one or the combination of two of sodium persulfate and potassium persulfate;
specifically, in the step (1 e), the aluminum-containing waste residue is any one or a combination of more than one of red mud, fly ash, steel slag and slag;
in the step (3), the activated and excited waste warm patch accounts for 2-13% of the dry weight of the dye-contaminated soil.
2. The method of claim 1, wherein the dye contaminates the soil and the leachate has a chromaticity of 300 to 1000 times as high as the chromaticity as measured by a dilution fold method.
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