CN115026125A - Method for repairing organic contaminated soil by using energy-saving thermally-activated persulfate - Google Patents
Method for repairing organic contaminated soil by using energy-saving thermally-activated persulfate Download PDFInfo
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- CN115026125A CN115026125A CN202210751175.0A CN202210751175A CN115026125A CN 115026125 A CN115026125 A CN 115026125A CN 202210751175 A CN202210751175 A CN 202210751175A CN 115026125 A CN115026125 A CN 115026125A
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- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 7
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biotechnology (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Mycology (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an energy-saving method for restoring organic contaminated soil by thermally activating persulfate, and belongs to the field of soil pollution restoration. The method mainly comprises early-stage investigation and determination of a repair target and a repair range; constructing a barrier wall; clearing and digging organic contaminated soil; screening and crushing the organic contaminated soil; mixing and piling an oxidant; thermally activating persulfate to oxidize organic matters to pollute the soil; performing mixed fermentation, degradation and restoration on active microorganisms; and (5) detecting the repairing effect. The method utilizes the heat treatment to activate the persulfate so as to degrade high molecular components, polymers and other refractory components in the composite organic polluted soil, efficiently utilizes the persulfate, and then continuously repairs and reduces organic matters in the soil by adding and mixing the active microorganism mixture, thereby achieving the aim of economically and efficiently thermally activating the persulfate to repair organic pollutants.
Description
Technical Field
The invention belongs to the technical field of organic contaminated soil remediation, and relates to an energy-saving method for remediating organic contaminated soil by thermally activating persulfate.
Background
Along with the process acceleration of urbanization development and the scarcity of land resources, the development and utilization of the urban industrial organic matter polluted site in China after restoration are concerned by people. Researches find that the persulfate has the characteristics of wide range of treating organic pollutants, moderate reaction rate, stability at normal temperature, good durability and the like, and is widely applied to chemical oxidation remediation engineering of organic polluted soil.
The persulfate activation mode comprises thermal activation, transition metal ion activation, ultraviolet light activation, alkali activation, hydrogen peroxide activation and the like, wherein the thermal activation is one of the most efficient persulfate activation technologies. The heat activation is mainly realized by increasing the temperature and providing enough activation energy to force the bond to break to generate sulfate radical (SO) 4 - And a hydrocarbyl radical (. OH), the oxidation capacity of the persulfate is limited at normal temperature, the oxidation-reduction potential is +2.01V, the persulfate generates an oxygen bond breaking reaction after absorbing heat energy to generate a sulfate radical with higher oxidation capacity, the oxidation-reduction potential is +2.6V, and the hydrogen react with each other to generate hydrogen 2 O and OH - The reaction generates a hydrocarbyl radical with the oxidation-reduction potential of + 2.8V; the average temperature in the thermal activation stage reaches 30-50 ℃, the persulfate in the soil pore fluid is obviously decomposed, and the removal rate of the organic matters after treatment reaches 87.5%.
Because the soil pollution is not easy to be found, the range of the polluted soil is wide, the impurities are more, the structural components are complex, the soil restoration amount is large, and the like, the existing oxidation reaction device for restoring the organic polluted soil by using the thermally activated persulfate is not widely applied due to the reasons of limited capacity and the like.
Therefore, the energy-saving method for repairing the organic polluted soil by enhancing persulfate oxidation through thermal activation curing is provided, the persulfate oxidation repairing effect of large-scale and composite organic polluted soil can be improved, the use of medicaments can be reduced, the energy consumption can be saved, and economic, efficient and green repairing can be realized.
Disclosure of Invention
The invention aims to overcome the defects in the application of the prior art and provides an energy-saving method for repairing organic contaminated soil by thermal activation curing and strengthening persulfate oxidation.
The technical problem solved by the invention is realized by adopting the following technical scheme:
an energy-saving method for restoring organic contaminated soil by thermally activating persulfate comprises the following steps:
(1) constructing a barrier wall, namely arranging a vertical barrier wall at the upstream boundary of the organic contaminated soil remediation site, wherein the depth of the barrier wall is 50-80cm below a water-resisting layer, so that the pollution of underground water in the construction period can be effectively reduced;
(2) screening and crushing pretreatment, in order to ensure the soil remediation effect, the main purpose of pretreatment is to solve the problems that the field soil is rich in impurities and complex in structural components and the water content of the soil with higher underground water level is higher
Can realize crushing, screening, screen out building rubbish and other impurity and moisture content and adjust. After the organic contaminated soil is dug, crushing and screening the contaminated soil by using an excavator and a crushing and screening hopper, adding quicklime according to the soil moisture content condition for regulation, and ensuring that the soil particle size is below 30mm and the soil moisture content is 20-40%;
(3) mixing and piling oxidants, adding oxidant persulfate into the soil subjected to crushing and screening pretreatment through a mobile soil remediation integrated device, and stirring and mixing uniformly; the oxidant persulfate is sodium persulfate, the oxidant is added in a solid form of sodium persulfate, and the amount of the oxidant persulfate is 1-2% (the theoretical calculation amount is 3%) of the pretreated soil;
(4) curing by using thermally activated persulfate, conveying the uniformly mixed polluted soil into a closed greenhouse in a thermally activated curing area, and stacking the polluted soil into long-strip soil blocks according to batches; the hot air system distributed in the closed greenhouse is maintained through thermal activation, the heating equipment and the ventilation system are used for regulating and controlling the heating soil through the real-time monitoring of a plurality of temperature and humidity monitoring points, persulfate is activated to generate sulfate radicals and alkyl radicals, and organic pollutants are degraded through oxidation; controlling the thermal activation temperature at 35-40 ℃, covering the cured soil by adopting heat-preservation tarpaulin, fixing the covering, maintaining for 3-5 days in a heat-preservation manner, ensuring that the water content in the cured soil is controlled at 20-40% (preferably 30%) during the maintenance period, and ensuring the effect of oxidation reaction;
(5) performing mixed fermentation, degradation and restoration on active microorganisms, adding an active microorganism mixture into the polluted soil cured by the thermally activated persulfate through mechanical mixing, wherein the active microorganism mixture is organic pollutants such as polluted organic soil, livestock and poultry manure, agricultural and forestry waste or kitchen garbage and the like and aerobic compost products of a microbial agent, regulating and controlling the soil environment temperature to be 45-60 ℃, the oxygen content of a soil pile body to be higher than 7.5%, the pile humidity to be 20-40%, maintaining the microbial degradation activity, and realizing continuous degradation of the organic pollutants; meanwhile, the mixture contains a certain content of humic acid, so that the persulfate can be chelated to repair residues in the organic polluted soil, and the influence on the physical and chemical properties of the repaired soil is reduced.
(6) And after the maintenance is finished, the soil restoration effect is monitored, and the resource utilization is carried out after the soil reaches the standard.
Further, the organic pollutants in the organic polluted soil are polycyclic aromatic hydrocarbons, petroleum hydrocarbons and benzene series pollutants. During the curing process of restoring the organic polluted soil by the persulfate, the persulfate is activated by heat treatment in a hot air heating mode to strengthen the oxidation reaction, and high molecular components, polymers and other components which are difficult to degrade in the composite organic polluted soil are degraded, so that the purpose of efficiently utilizing the persulfate is achieved. And then through the addition and mixing of the active microorganism mixture, the organic matters in the soil are continuously repaired and reduced, the comprehensive removal efficiency of the organic pollutants in the soil is about 87.5 percent, and the improvement is about 15 percent.
Furthermore, the temperature monitoring is controlled through an intelligent heating hot air heating system and a monitoring control system, the hot air temperature and the air quantity are automatically regulated and controlled according to a soil heap temperature monitoring point, and the energy consumption is reduced.
Further, the humidity is adjusted by controlling the sprayer, and the humidity of the polluted soil pile is controlled to be 20% -40% according to the humidity monitoring data of the soil pile humidity monitoring point.
Furthermore, the sprayers are arranged according to the spacing distance of the organic polluted soil pile, and the spraying distance is set according to the width of the soil pile.
Furthermore, in the hot activated persulfate curing greenhouse, the hot air heating system and the tail gas ventilation system are indirectly operated in an exchange mode, so that the heat brought away by water evaporation is reduced.
The invention has the beneficial effects that:
the restoration method of the invention uses the heat treatment to activate persulfate so as to degrade high molecular components, polymers and other non-degradable components in the composite organic contaminated soil, and then continuously restores and reduces organic matters in the soil by adding and mixing the mixture containing the high-efficiency degradable active microorganisms. The soil temperature is heated by utilizing a hot air heating mode, obvious persulfate is decomposed in soil pore fluid by raising the temperature, sulfate radicals and alkyl radicals are generated, the engineering application is wider, the continuous degradation of organic pollutants can be realized by adding an active microorganism mixture, and the economic, efficient and green restoration is realized.
According to the invention, the precise temperature control for maintaining the closed greenhouse is realized by using the hot air system distributed in the closed greenhouse through thermal activation maintenance, the temperature condition interval of persulfate activation is reached through the monitoring systems of temperature, humidity and the like, the aim of repairing organic pollutants by using economical and efficient thermal activation reinforced persulfate is realized, and the energy consumption cost is saved by about 35%.
According to the invention, persulfate is activated by heat treatment to degrade high-molecular components, polymers and other non-degradable components in the composite organic contaminated soil, and then the mixture containing the high-efficiency degradable active microorganisms is added and mixed, so that the organic matters in the soil are continuously repaired and reduced, and the usage amount of an oxidation agent in the repairing process can be saved by about 32%.
Drawings
FIG. 1 is a process flow diagram of a method and process for remediating organic contaminated soil using energy-saving thermally activated persulfate;
FIG. 2 is a plan view of a closed greenhouse in a curing area;
FIG. 3 is a diagram of a temperature-increasing heating system;
in the figure: 1. a gas storage tank; 2. an intelligent temperature control gas hot blast stove; 3. a hot air duct; 4. organic contaminated soil heaps; 5. heat insulation tarpaulin; 6. monitoring indicating points of temperature and humidity; 7. an active microorganism mixture preparation system; 8. a tail gas pipe; 9. a workshop is closed to form a greenhouse; 10. a dust remover; 11. an activated carbon box; 12. a chimney; 13. an atomizer.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited thereto.
Example 1
The application of the patent relates to a method for repairing organic contaminated soil by oxidizing and strengthening persulfate through energy-saving thermal activation and maintenance, which specifically comprises the following steps:
step 1: and (5) constructing a barrier wall. The vertical separation wall is arranged on the upstream boundary of the repair site, so that the pollution to underground water in the construction period can be effectively reduced, and the depth of the separation wall is 50cm below a waterproof layer.
Step 2: and (4) screening and crushing pretreatment. For guaranteeing soil remediation effect, to many and the structural component complicacy of place soil impurity, the higher soil moisture content of ground water level problem on the high side, broken, screening can be realized to the preliminary treatment main objective, screens out building rubbish and other impurity and moisture content and adjusts. The method comprises the steps of pre-treating the organic polluted soil after dredging by using an excavator and a crushing and screening hopper, adding a small amount of quicklime according to the soil moisture content condition to adjust the moisture content, and ensuring that the soil particle size is below 30mm and the soil moisture content is about 30%.
And step 3: the oxidizing agents are uniformly mixed and stirred. Specifically, the method comprises the steps of crushing and screening pretreated soil, adding an oxidizing agent sodium persulfate through mobile soil remediation integrated equipment, and uniformly stirring and mixing; the medicament is added in a sodium persulfate solid form, and the mass ratio of the added sodium persulfate serving as the oxidizing medicament is 1-2% (the theoretical calculated amount of the addition is 3%).
And 4, step 4: and (5) thermally activating persulfate for curing. After being uniformly mixed, the polluted soil is transported into a maintenance closed greenhouse and piled into long-strip soil blocks according to batches; the hot air system distributed in the closed greenhouse is maintained through thermal activation, the heating equipment and the ventilation system are used for regulating and controlling the heating soil through the real-time monitoring of a plurality of temperature and humidity monitoring points, persulfate is activated to generate sulfate radicals and alkyl radicals, and organic pollutants are degraded through oxidation; after the soil heating temperature is controlled at 40 ℃, the maintained soil is covered by adopting heat-preservation tarpaulin, and the covering is fixed. And maintaining for 3-5 days, and ensuring that the water content in the maintained soil is controlled to be about 30% during the maintenance period, thereby ensuring the effect of oxidation reaction.
And 5: fermenting, degrading and repairing the active microorganism mixture. The active microorganism mixture is organic pollutants such as polluted organic soil, livestock and poultry manure, agricultural and forestry waste or kitchen garbage and the like, and aerobic compost products of a microbial agent. The organic pollutants can be continuously degraded by adding the active microorganism mixture through mechanical mixing and regulating soil environment conditions and keeping the microbial degradation activity, and meanwhile, the mixture contains a certain content of humic acid, so that the persulfate can be chelated to repair residues in the organic polluted soil, and the influence on the physical and chemical properties of the repaired soil is reduced.
Step 6: and (3) detection of a repairing effect: and after the maintenance is finished, the soil remediation effect is monitored, and the resource utilization is carried out after the soil remediation effect reaches the standard.
According to the method, the thermal activation curing area is adopted to seal the greenhouse, an intelligent heating hot air heating system is added to thermally activate the persulfate to strengthen the oxidation reaction in the curing process of repairing the organic polluted soil by the persulfate, and then the organic matters in the soil are continuously repaired and reduced by adding and mixing the mixture containing the efficiently degraded active microorganisms. As shown in fig. 2, the enclosed greenhouse in the heat activated curing area comprises: 1. a gas storage tank; 2. an intelligent temperature control gas hot blast stove; 3. a hot air duct; 4. organic contaminated soil heaps; 5. heat insulation tarpaulin; 6. monitoring indicating points of temperature and humidity; 7. an active microorganism mixture preparation system; 8. a tail gas pipe; 9. a workshop is closed to form a greenhouse; 10. a dust remover; 11. an activated carbon box; 12. a chimney; 13. an atomizer.
The organic pollutants in the organic polluted soil are polycyclic aromatic hydrocarbons, petroleum hydrocarbons and benzene series.
Soil is uniformly heated through hot air, a bottom heat supply pipe in the curing workshop is communicated with a temperature regulator of the intelligent temperature control gas hot blast stove, and the heat supply pipe is provided with an air flow regulating valve.
In the maintenance workshop, the atomizer is reasonably controlled to use according to the humidity monitoring data of the humidity monitoring point of the soil pile, and the humidity of the polluted soil pile is controlled to be about 30 percent.
After the mixed medicament is mixed, the organic contaminated soil pile is covered by tarpaulin with heat insulation and moisture preservation functions under the maintenance conditions that the temperature reaches 40 ℃ and the humidity reaches about 30 percent.
The sprayers are arranged according to the spacing distance of the organic polluted soil pile, and the spraying distance is set according to the width of the soil pile.
The hot air heating system and the tail gas ventilation system in the heat activated persulfate curing workshop are in exchange indirect operation, so that the heat brought away by water evaporation is reduced.
According to the invention, persulfate is activated by a hot air heating mode to degrade high-molecular components, polymers and other non-degradable components in the composite organic polluted soil, so that the added persulfate is efficiently utilized, and then the mixture containing the efficiently-degraded active microorganisms is added and mixed to continuously repair and reduce organic matters in the soil, so that the organic pollutants are efficiently removed. The invention provides a novel method for repairing organic contaminated soil with high efficiency and energy conservation.
Claims (9)
1. An energy-saving method for restoring organic contaminated soil by thermally activating persulfate is characterized by comprising the following steps:
(1) constructing a barrier wall; arranging a vertical separation wall at the upstream boundary of the organic contaminated soil remediation site, wherein the depth of the separation wall is 50-80cm below the waterproof layer;
(2) screening and crushing pretreatment; after the organic contaminated soil is dug, crushing and screening the contaminated soil by using an excavator and a crushing and screening hopper, adding quicklime according to the soil moisture content condition for regulation, and ensuring that the soil particle size is below 30mm and the soil moisture content is 20-40%;
(3) mixing and piling an oxidant; adding an oxidation agent persulfate into the soil subjected to crushing and screening pretreatment through a mobile soil remediation integrated device, and uniformly stirring and mixing;
(4) curing by thermally activating persulfate; conveying the uniformly mixed polluted soil into a closed greenhouse in a thermal activation maintenance area, and stacking the polluted soil into long-strip soil blocks according to batches; the hot air system distributed in the closed greenhouse is maintained through thermal activation, the heating equipment and the ventilation system are used for regulating and controlling the heating soil through the real-time monitoring of a plurality of temperature and humidity monitoring points, persulfate is activated to generate sulfate radicals and alkyl radicals, and organic pollutants are degraded through oxidation; controlling the thermal activation temperature to be 35-40 ℃, covering the cured soil by adopting heat-preservation tarpaulin, fixing the covering, maintaining for 3-5 days in a heat-preservation manner, ensuring that the water content in the cured soil is controlled to be 20-40% during the maintenance period, and ensuring the effect of an oxidation reaction;
(5) performing mixed fermentation, degradation and restoration by using active microorganisms; adding an active microorganism mixture into the polluted soil after the thermal activation persulfate is cured by mechanical mixing, wherein the active microorganism mixture is an organic pollutant and a microbial agent aerobic compost product, regulating and controlling the soil environmental condition, keeping the microbial degradation activity and realizing the continuous degradation of the organic pollutant;
(6) and after the maintenance is finished, the soil remediation effect is monitored, and the resource utilization is carried out after the soil remediation effect reaches the standard.
2. The method for remediating organically-polluted soil as claimed in claim 1, wherein the organic pollutants in the organically-polluted soil are polycyclic aromatic hydrocarbons, petroleum hydrocarbons, benzene-series pollutants.
3. The method for remediating organically-polluted soil using the energy-saving thermally-activated persulfate as set forth in claim 1, wherein in the step (3), the oxidant persulfate is sodium persulfate, and the chemical is added in the form of sodium persulfate solid, and the amount of the oxidant persulfate is 1% -2% of the pretreated soil.
4. The energy-saving method for remediating organic contaminated soil by using heat-activated persulfate as claimed in claim 1, wherein in the step (4), the temperature monitoring is controlled by an intelligent heating hot air heating system and a monitoring control system, and the temperature and the air volume of hot air are automatically regulated and controlled according to a soil pile temperature monitoring point.
5. The energy-saving method for remediating organic contaminated soil by using thermally activated persulfate as claimed in claim 1, wherein in the step (4), the humidity is adjusted by controlling a sprayer, and the humidity of the contaminated soil pile is controlled to be 20% -40% according to the humidity monitoring data of the humidity monitoring point of the soil pile.
6. The method for remediating organically-polluted soil as claimed in claim 4, wherein the sprayers are arranged according to the spacing distance of the organically-polluted soil pile, and the spraying distance is set according to the width of the soil pile.
7. The method for repairing organic contaminated soil according to claim 4, wherein the hot air heating system and the tail gas ventilation system are indirectly operated in an exchange manner to reduce the heat taken away by water evaporation in the greenhouse maintained by the heat-activated persulfate.
8. The method for remediating organically-polluted soil by using the energy-saving thermally-activated persulfate as claimed in claim 4, wherein in the step (5), the soil environment conditions are that the temperature is 45-60 ℃, the oxygen content of the soil pile is higher than 7.5%, and the humidity of the polluted soil pile is 20% -40%.
9. The method for remediating organic contaminated soil using energy-saving thermally activated persulfate as claimed in claim 4, wherein the organic contaminant is contaminated organic soil, livestock and poultry manure, agricultural and forestry waste, or kitchen waste.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210751175.0A CN115026125A (en) | 2022-06-29 | 2022-06-29 | Method for repairing organic contaminated soil by using energy-saving thermally-activated persulfate |
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| CN202210751175.0A CN115026125A (en) | 2022-06-29 | 2022-06-29 | Method for repairing organic contaminated soil by using energy-saving thermally-activated persulfate |
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| CN202210751175.0A Pending CN115026125A (en) | 2022-06-29 | 2022-06-29 | Method for repairing organic contaminated soil by using energy-saving thermally-activated persulfate |
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| US20020179525A1 (en) * | 2001-01-09 | 2002-12-05 | Jon Shaffer | Apparatus and method for biological treatment of environmental contaminants and waste |
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| CN112547790A (en) * | 2020-12-28 | 2021-03-26 | 苏州精英环保有限公司 | Device for repairing organic contaminated soil through microbial combined chemical oxidation |
| CN112570444A (en) * | 2020-11-25 | 2021-03-30 | 北京高能时代环境技术股份有限公司 | Low-temperature heat-enhanced chemical oxidation-microorganism coupling repair system and method for polycyclic aromatic hydrocarbon contaminated soil |
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| CN112570444A (en) * | 2020-11-25 | 2021-03-30 | 北京高能时代环境技术股份有限公司 | Low-temperature heat-enhanced chemical oxidation-microorganism coupling repair system and method for polycyclic aromatic hydrocarbon contaminated soil |
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