CN112169571A - Method for treating malodorous gas and VOC - Google Patents
Method for treating malodorous gas and VOC Download PDFInfo
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- CN112169571A CN112169571A CN202011145459.2A CN202011145459A CN112169571A CN 112169571 A CN112169571 A CN 112169571A CN 202011145459 A CN202011145459 A CN 202011145459A CN 112169571 A CN112169571 A CN 112169571A
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention relates to a method for treating malodorous gas and VOC, which comprises an in-situ oxidation removal method and/or an overflow rapid removal method. The method for treating the malodorous gas and the VOC does not need large-scale excavation construction on the treated garbage pile or the polluted soil, but injects a treatment agent into the garbage pile or the polluted soil by pressure through the pressure injection pipe network to form an in-situ advanced oxidation reaction to reduce or eliminate the malodorous gas and the VOC, and can avoid or reduce the possibility of large-scale concentrated overflow and diffusion of sudden malodorous gas and VOC caused by large-scale excavation construction of the garbage pile or the polluted soil, thereby avoiding or reducing the influence of the concentrated overflow and diffusion of the malodorous gas and the VOC on constructors and surrounding residents.
Description
Technical Field
The invention belongs to the technical field of environmental management, and particularly relates to a method for treating malodorous gas and VOC.
Background
The landfill site is one of the main sources of odor pollution, is concerned more and more at present, and developed countries in the western world have many years of history and experience on the prevention and treatment of the odor gas of the landfill site, and have relatively perfect integrated comprehensive treatment schemes of gas-liquid-solid phase pollutants. With the rapid development of the Chinese social economy, the production amount of the garbage continuously rises, but a relatively perfect comprehensive treatment scheme for gas-liquid-solid phase pollutants is not formed due to late start, and particularly, the problem that a garbage landfill built earlier is aged and easily generates malodorous gas pollution is solved. The odor pollution problem of a plurality of local refuse landfills is serious, the attention of residents is more and more aroused, and the site selection of the landfills is more difficult due to the problem caused by the odor pollution. The relatively new landfill site adopts the cover film, can effectively control the excessive of rubbish foul gas, but when the cover film ages or damages, the foul gas in the rubbish heap will have excessive risk.
The main components of malodorous gases include nitrogen-containing compounds, sulfides, hydrocarbons and aromatic hydrocarbons, halogenated hydrocarbons, ketol-aldehyde phenols and other oxygen-containing organic compounds, such as: hydrogen sulfide (H)2S), methyl mercaptan (CH)3SH), thiodimethyl ether ((CH)3)2S), dimethyldisulfide ((CH)3)2S2) Carbon disulfide (CS)2) Ammonia (NH)3) Trimethylamine ((CH)3)3N), styrene (AR-CH ═ CH)2) Etc., wherein hydrogen sulfide (H)2S) is the most common malodorous gas in the landfill gas, and seriously affects the normal life and health of surrounding residents. The technical method for treating the malodorous gas basically changes the phase or structure of the malodorous gas through physical, chemical and biological actions so as to achieve the aim of removing the malodorous gas. Physical methods include masking neutralization, dilution and diffusion, condensation, water absorption and adsorption; the chemical method mainly comprises the following steps: o is3Oxidation, photocatalytic oxidation, combustion methods; the biological method mainly comprises the steps of adding various microbial floras for decomposition and spraying a composite microbial floras deodorant or other biological treatment agents for removal. The biological treatment method has low cost and wide application, has good effects of removing and controlling malodorous gases, but has some defects and shortcomings. The microbial adsorption and decomposition functions are insufficient, and particularly due to instability and complexity of components and toxicity of solid wastes of the refuse landfill, the compound microbial flora cannot effectively play a corresponding treatment role. Various physical treatment methods are complex in construction and difficult to operate and implement. Photocatalytic oxidation and O3The oxidation method has high equipment cost and complex operation. The invention relates to a novel high-efficiency treatment technology, which can remove malodorous gases in situ in a garbage pile before the malodorous gases overflow and diffuse, can quickly remove the emitted malodorous gases, and has urgency and necessity.
On the other hand, after many chemical plants, pharmaceutical plants and other highly polluted plant enterprises are moved, the soil in the original site of the plant enterprise is seriously polluted by various pollutants accumulated for a long time due to historical reasons. The polluted soil is not only polluted by heavy metal and inorganic pollutants, but also seriously polluted by organic pollutants. The pollutants generate high-concentration malodorous gases and VOC (volatile organic compounds) in the polluted soil, which not only seriously affect the normal life and health of surrounding residents, but also seriously threaten the construction safety of soil restoration constructors. At present, the high-concentration polluted soil is repaired by adopting an ex-situ treatment method or an in-situ ex-situ treatment method, and an in-situ treatment method is adopted, but the treatment effect on the high-concentration pollution is limited. The more advanced technology aiming at organic pollutants and soil VOC is a thermal desorption technology and a thermal desorption technology, and the polluted soil is heated to be above the boiling point of organic matters in a heating mode or a steam adding mode so that the organic matters in the adsorbed soil are volatilized into a gas state and then are separated. These techniques can provide good repair results, but suffer from several disadvantages and drawbacks: because the soil malodorous gas and VOC have extremely high concentration, once the soil surface covering layer begins to be excavated ("peeled off"), the high-concentration malodorous gas and VOC can overflow and diffuse rapidly, and the safety of constructors and the life and health of surrounding residents are seriously influenced; the thermal desorption or thermal desorption technology volatilizes organic pollutants into gas and then carries out closed treatment, but in fact, the closed treatment is difficult in the construction process, and the volatilized malodorous gas and VOC can overflow and diffuse rapidly, thereby influencing the life and health of surrounding residents and the safety of construction personnel. The in-situ treatment by adopting an oxidation mechanism also needs excavation construction of polluted soil to carry out oxidation treatment, and once a covering layer on the surface of the soil is excavated (peeled), high-concentration malodorous gas and VOC overflow and are scattered everywhere due to extremely high concentration of malodorous gas and VOC, so that the safety of constructors and the life and health of surrounding residents are seriously influenced. The invention relates to a product and a technology, which can efficiently and quickly form in-situ advanced oxidation to reduce high-concentration malodorous gas and VOC accumulated in soil for a long time without large-scale excavation and construction of the treated soil, and can quickly remove the overflowing and diffused VOC and malodorous gas, thereby becoming very urgent and necessary.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for treating malodorous gas and VOC, which comprises the steps of respectively injecting a seaweed organic polymer oxidant and hydrogen peroxide or organic acid diluted solution into a pressure injection pipe network by using a dosing device and pressure injection equipment, carrying out in-situ advanced oxidation reaction, reducing the malodorous gas and VOC so as to prevent or reduce the overflow and diffusion of the malodorous gas and VOC, and quickly removing the malodorous gas and VOC which have overflowed and diffused around by using a seaweed organic polymer odor treating agent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for treating malodorous gas and VOC comprises an in-situ oxidation reduction method and/or an overflow rapid removal method, and comprises the following specific steps:
the in-situ oxidation reduction method specifically comprises the following steps:
(1) arranging a pressure injection pipe network on the garbage pile or the polluted soil to form a pressure injection pipe network;
(2) diluting industrial hydrogen peroxide or organic acid with the concentration of 35-50% by using clear water to form hydrogen peroxide or organic acid diluted solution;
(3) respectively injecting a seaweed organic polymer oxidant and hydrogen peroxide or an organic acid diluted solution into a pressure injection pipe network by using a dosing device and pressure injection equipment to perform in-situ advanced oxidation reaction, wherein the oxidation reaction time is not less than 72 h;
(4) and (3) repeating the treatment: detecting the concentration of malodorous gas and VOC in the garbage dump or the polluted soil, and repeating the steps (3) and (4) according to the detection result until the detection result meets the standard;
the overflow quick removal method specifically comprises the following steps:
(I) diluted release medicament: diluting the seaweed organic polymer odor treatment agent with clear water;
(II) spraying or sprinkling the diluted seaweed organic polymer peculiar smell treating agent to polluted regional air by using a continuous or intermittent spraying system or a sprinkling system.
Further, the pressure injection pipe network in the step (1) is of a network structure formed by vertically and horizontally arranging a plurality of plastic pipes, the diameters of the plastic pipes are 3/4-5 inches, and the distance between every two adjacent plastic pipes is 3-6 feet.
The in-situ oxidation reduction method adopts the seaweed organic polymer oxidant and the hydrogen peroxide solution or the organic acid solution, and injects the medicament into the garbage dump or the polluted soil through the arranged injection pipe network to form in-situ advanced oxidation, so that malodorous gas and VOC are degraded in the garbage dump or the polluted soil, and the overflowing and diffusion of the malodorous gas and VOC are prevented or reduced. The seaweed organic polymer oxidant is a liquid solution, can form advanced oxidation by matching with hydrogen peroxide or an organic acid solution, has long oxidation duration, and cannot form transient violent reaction and high temperature due to natural control of reaction limit values, and is easy to construct, safe and reliable.
The method for rapidly removing the overflow adopts the seaweed organic polymer peculiar smell treating agent and removes the peculiar smell in the area where the malodorous gas and the VOC overflow and diffusion are carried out by a spraying or sprinkling method. The seaweed organic polymer odor treatment agent is a nano-scale high molecular polymer, is non-toxic and harmless, can quickly adsorb the overflowed and diffused malodorous gas or VOC, is combined with the malodorous gas or VOC to form a new bond, and is settled on the surface layer of the ground, so that the overflowed and diffused malodorous gas and VOC are quickly removed.
Further, the mass percentage of the industrial hydrogen peroxide or the organic acid and the clear water in the step (2) is 10-40%: 90-60 percent.
Further, the organic acid is citric acid or oxalic acid.
Further, in the step (3), the injection amount of the seaweed organic polymer oxidant is 1-5% of the total volume of the treated solid waste or the polluted soil, and the injection amount of the hydrogen peroxide diluted solution is 10-40% of the total volume of the treated solid waste or the polluted soil.
Further, the preparation method of the seaweed organic polymer oxidant in the step (3) comprises the following steps: stirring and crushing the deep sea seaweed, adding 35% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, and filtering to obtain the seaweed organic polymer oxidant.
Further, the pH value of the seaweed organic polymer oxidant is 10.5-11.5.
Further, the mass ratio of the seaweed organic polymer peculiar smell treating agent to the clean water in the step (I) is 1: 10-100.
Further, the preparation method of the seaweed organic polymer odor treatment agent in the step (II) comprises the following steps: stirring and crushing the deep sea seaweed, adding 3% sulfuric acid by mass percent for acidification treatment, adding 3% sodium hydroxide by mass percent for leaching and filtering, and adding 10-50% deionized water to obtain the seaweed organic polymer peculiar smell treating agent.
Further, the pH value of the seaweed organic polymer odor treating agent is 6.5-7.5.
Furthermore, the treatment method is suitable for one or more of treatment of malodorous gas of garbage dump bodies of garbage landfill sites, treatment of malodorous gas and VOC of polluted soil, treatment of malodorous gas of garbage collection stations and treatment of malodorous gas of garbage transfer stations.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method for treating the malodorous gas and the VOC does not need large-scale excavation construction on the treated garbage pile or the polluted soil, but injects a treatment agent into the garbage pile or the polluted soil by pressure through the pressure injection pipe network to form an in-situ high-grade oxidation reaction, so as to reduce or eliminate the malodorous gas and the VOC, and the method can avoid or reduce the possibility that a large amount of sudden malodorous gas and VOC are intensively overflowed and diffused because the garbage pile or the polluted soil is subjected to large-scale excavation construction, so that the influence of the centralized overflowed diffusion of the malodorous gas and VOC on constructors and surrounding residents is avoided or reduced;
(2) the treatment method of the invention reduces the malodorous gas and VOC in the garbage dump or the polluted soil, prevents or reduces the malodorous gas and VOC from overflowing and diffusing, and prevents or reduces the potential air pollution from the source; the method can also rapidly remove the malodorous gas and VOC overflowing and diffusing around, and further prevent and prevent pollution of other malodorous gas and VOC to the surrounding air;
(3) the treatment method of the invention uses the commercially available spraying or sprinkling equipment, pipelines, dosing devices and pressure injection equipment, does not need special equipment and devices, and has low equipment and device cost and simple operation;
(4) the in-situ oxidation reduction method or the overflow quick removal method can be used independently or comprehensively, can be used as an emergency treatment scheme for malodorous gas and VOC, and can also be used as a comprehensive treatment and long-term maintenance scheme for malodorous gas and VOC;
(5) the treatment method provides a technical choice for reducing the risk possibly caused by sudden and large amount of overflow and diffusion of high-concentration malodorous gas and VOC during excavation in the high-pollution soil remediation treatment construction, and also provides a technical choice for solving the problem of malodorous gas in a closed refuse landfill site by using excavation construction due to the fact that the malodorous gas overflows and diffuses at multiple source points.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a process flow diagram of the method for treating malodorous gases and VOCs of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1, a process flow chart of the method for treating malodorous gases and VOCs of the present invention.
Example 1
The method for treating malodorous gas and VOC in a landfill body comprises an in-situ oxidation removal method and an overflow rapid removal method, wherein the in-situ oxidation removal method specifically comprises the following steps:
according to a standard landfill body construction mode, a 3-foot (long) by 6-foot (wide) by 3-foot (high) simulation landfill site is constructed, the surface layer is covered by a landfill covering film in a closed mode and is placed for 10 days, and the concentration of malodorous gas in the simulation landfill site is extremely high.
(1) Arranging a pressure injection pipe network on the garbage stack body to form the pressure injection pipe network, wherein the pressure injection pipe network is of a network structure formed by vertically and horizontally arranging a plurality of plastic pipes, the diameter of each plastic pipe is 3/4 inches, and the distance between every two adjacent plastic pipes is 4 feet;
(2) diluting industrial hydrogen peroxide with the concentration of 35% by using clear water, wherein the mass percentage of the industrial hydrogen peroxide to the clear water is 10%: 90 percent to form a hydrogen peroxide diluted solution;
(3) respectively injecting a seaweed organic polymer oxidant and a hydrogen peroxide diluted solution into a pressure injection pipe network by using a dosing device and pressure injection equipment, wherein the preparation method of the seaweed organic polymer oxidant comprises the following steps: stirring and crushing deep sea seaweed, adding 35% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, and filtering to obtain a seaweed organic polymer oxidant, wherein the pH value of the seaweed organic polymer oxidant is 10.5-11.5, carrying out in-situ advanced oxidation reaction, and standing for 72 hours, wherein the injection amount of the seaweed organic polymer oxidant is 1% of the total volume of the treated solid waste, and the injection amount of a hydrogen peroxide diluted solution is 10% of the total volume of the treated solid waste;
(4) detecting that the malodorous gas reduction rate is 69%, repeating the step (3), standing for reaction for 72h after adding the medicament for the second time, detecting again, wherein the malodorous gas reduction rate reaches 92%, repeating the step (3), standing for reaction for 72h after adding the medicament for the third time, detecting again, wherein the malodorous gas removal rate is maintained between 92 and 93%, and the step (3) is not repeated because new malodorous gas is continuously generated in the garbage stack body and cannot be completely reduced; and (4) after 28 days, the concentration of the malodorous gas rises again, the step (3) is repeated, after the medicament is added for the fourth time, the mixture is kept stand for 72 hours, the concentration of the malodorous gas is detected, the removal rate is basically the same as the concentration after the medicament is added for the third time, and the treatment of the step (3) is not repeated.
The results of detecting the concentration of the malodorous gas in the garbage heap after the multiple treatments in the embodiment 1 show that the malodorous gas concentration reduction rate reaches 92 to 93 percent after the three treatments. Because the garbage pile body can continuously generate malodorous gas, the garbage pile body can be supplemented with one treatment every 28 days, and the effect of the third treatment can be maintained.
The amount of malodorous gas overflowing and diffusing in the treatment process is very small, and an overflow rapid removal method is adopted, which comprises the following steps:
(I) diluted release medicament: diluting the seaweed organic polymer peculiar smell treating agent by using clear water, wherein the mass ratio of the seaweed organic polymer peculiar smell treating agent to the clear water is 1: 10;
(II) spraying the diluted seaweed organic polymer odor treatment agent to polluted regional air by using a continuous spraying system, wherein the preparation method of the seaweed organic polymer odor treatment agent comprises the following steps: stirring and crushing deep sea seaweed, adding 3% by mass of sulfuric acid for acidification treatment, adding 3% by mass of sodium hydroxide for leaching and filtering, and adding 10% by mass of deionized water to obtain the seaweed organic polymer peculiar smell treating agent, wherein the pH value of the seaweed organic polymer peculiar smell treating agent is 6.5-7.5.
Tests show that the in-situ interior of the garbage pile has good effect of reducing and removing the malodorous gas and high reduction and removal rate, and the method can effectively treat and control the malodorous gas in the garbage landfill pile.
Example 2
The method for treating high-concentration malodorous gas and high VOC in the polluted soil of the pesticide factory site comprises an in-situ oxidation removal method, and specifically comprises the following steps:
a soil sample of 1 cubic meter is taken from a severely polluted farm, and is placed in a sealed container, the surface layer is sealed and covered by a plurality of layers of covering films, so that malodorous gas and VOC are prevented from overflowing, and a simulated soil treatment block is prepared.
(1) Arranging a pressure injection pipe network on the garbage stack body to form the pressure injection pipe network, wherein the pressure injection pipe network is of a network structure formed by vertically and horizontally arranging a plurality of plastic pipes, the diameter of each plastic pipe is 1 inch, and the distance between every two adjacent plastic pipes is 3 feet;
(2) diluting industrial hydrogen peroxide with the concentration of 35% by using clear water, wherein the mass percentage of the industrial hydrogen peroxide to the clear water is 25%: 75 percent to form hydrogen peroxide diluted solution;
(3) respectively injecting a seaweed organic polymer oxidant and a hydrogen peroxide diluted solution into a pressure injection pipe network by using a dosing device and pressure injection equipment, wherein the preparation method of the seaweed organic polymer oxidant comprises the following steps: stirring and crushing deep sea seaweed, adding 35% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, and then filtering to obtain a seaweed organic polymer oxidant, wherein the pH value of the seaweed organic polymer oxidant is 10.5-11.5, carrying out in-situ advanced oxidation reaction, and standing for 72 hours, wherein the injection amount of the seaweed organic polymer oxidant is 3% of the total volume of the polluted soil, and the injection amount of the hydrogen peroxide diluted solution is 25% of the total volume of the polluted soil;
(4) detecting the concentration of malodorous gas and VOC, wherein the removal rate is 59%, repeating the step (3), after adding the medicament for the second time, standing for reaction for 72h, detecting the concentration of malodorous gas and VOC again, wherein the removal rate of malodorous gas and VOC reaches 76%, repeating the step (3), after adding the medicament for the third time, standing for reaction for 72h, detecting the concentration of malodorous gas and VOC again, wherein the removal rate is maintained at 85%, repeating the step (3), after adding the medicament for the fourth time, standing for reaction for 72h, detecting the concentration of malodorous gas and VOC again, wherein the removal rate is 92%, repeating the step (3), after adding the medicament for the fifth time, standing for reaction for 72h, detecting the concentration of malodorous gas and VOC again, wherein the removal rate is 93.5%, and repeating the step (3) again.
The results of detecting the concentrations of malodorous gases and VOCs in the polluted soil after the multiple treatments in the above embodiment show that the reduction rate reaches about 92% after the four treatments, and the reduction rate is 93.5% after the fifth treatment, so that the repeated reduction is not performed any more, and the final reduction rate is about 92% -93%.
The amount of malodorous gas overflowing and diffusing in the treatment process is very small, and an overflow rapid removal method is adopted, which comprises the following steps:
(I) diluted release medicament: diluting the seaweed organic polymer peculiar smell treating agent by using clear water, wherein the mass ratio of the seaweed organic polymer peculiar smell treating agent to the clear water is 1: 55;
(II) spraying the diluted seaweed organic polymer odor treatment agent to polluted regional air by using a continuous spraying system, wherein the preparation method of the seaweed organic polymer odor treatment agent comprises the following steps: stirring and crushing the deep sea seaweed, adding 3% sulfuric acid by mass for acidification treatment, adding 3% sodium hydroxide by mass for leaching and filtering, and adding 50% deionized water to obtain the seaweed organic polymer peculiar smell treating agent, wherein the pH value of the seaweed organic polymer peculiar smell treating agent is 6.5-7.5.
The treatment method can effectively treat the malodorous gas and VOC in the polluted soil.
Example 3
The method for treating malodorous gas and VOC in a landfill body comprises an in-situ oxidation removal method and an overflow rapid removal method, wherein the in-situ oxidation removal method specifically comprises the following steps:
according to a standard landfill body construction mode, a 3-foot (long) by 6-foot (wide) by 3-foot (high) simulation landfill site is constructed, the surface layer is covered by a landfill covering film in a closed mode and is placed for 10 days, and the concentration of malodorous gas in the simulation landfill site is extremely high.
(1) Arranging a pressure injection pipe network on the garbage pile body to form the pressure injection pipe network, wherein the pressure injection pipe network is of a network structure formed by vertically and horizontally arranging a plurality of plastic pipes, the diameter of each plastic pipe is 1 inch, and the distance between every two adjacent plastic pipes is 4.5 feet;
(2) diluting citric acid with clear water, wherein the mass percent of the citric acid to the clear water is 40%: 60% to form a citric acid diluted solution;
(3) respectively injecting a seaweed organic polymer oxidant and a citric acid diluted solution into a pressure injection pipe network by using a dosing device and pressure injection equipment, wherein the preparation method of the seaweed organic polymer oxidant comprises the following steps: stirring and crushing deep sea seaweed, adding 35% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, and filtering to obtain a seaweed organic polymer oxidant, wherein the pH value of the seaweed organic polymer oxidant is 10.5-11.5, carrying out in-situ advanced oxidation reaction, and standing for 72 hours, wherein the injection amount of the seaweed organic polymer oxidant is 5% of the total volume of the treated solid waste, and the injection amount of the citric acid diluted solution is 40% of the total volume of the treated solid waste; (ii) a
(4) Detecting that the malodorous gas reduction rate is 80%, repeating the step (3), standing for reaction for 72h after adding the medicament for the second time, detecting again, wherein the malodorous gas reduction rate reaches 92%, repeating the step (3), standing for reaction for 72h after adding the medicament for the third time, detecting again, wherein the malodorous gas removal rate is maintained between 92 and 93%, and the step (3) is not repeated because new malodorous gas is continuously generated in the garbage stack body and cannot be completely reduced; and (4) after 28 days, the concentration of the malodorous gas rises again, the step (3) is repeated, after the medicament is added for the fourth time, the mixture is kept stand for 72 hours, the concentration of the malodorous gas is detected, the removal rate is basically the same as the concentration after the medicament is added for the third time, and the treatment of the step (3) is not repeated.
The results of detecting the concentration of the malodorous gas in the garbage heap after the multiple treatments in the embodiment 1 show that the malodorous gas concentration reduction rate reaches 92 to 93 percent after the three treatments. Because the garbage pile body can continuously generate malodorous gas, the garbage pile body can be supplemented with one treatment every 28 days, and the effect of the third treatment can be maintained.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The method for treating malodorous gas and VOC is characterized by comprising an in-situ oxidation removal method and/or an overflow rapid removal method, and comprises the following specific steps:
the in-situ oxidation reduction method specifically comprises the following steps:
(1) arranging a pressure injection pipe network on the garbage pile or the polluted soil to form a pressure injection pipe network;
(2) diluting industrial hydrogen peroxide or organic acid with the concentration of 35-50% by using clear water to form hydrogen peroxide or organic acid diluted solution;
(3) respectively injecting a seaweed organic polymer oxidant and hydrogen peroxide or an organic acid diluted solution into a pressure injection pipe network by using a dosing device and pressure injection equipment to perform in-situ advanced oxidation reaction, wherein the oxidation reaction time is not less than 72 h;
(4) and (3) repeating the treatment: detecting the concentration of malodorous gas and VOC in the garbage dump or the polluted soil, and repeating the steps (3) and (4) according to the detection result until the detection result meets the standard;
the overflow quick removal method specifically comprises the following steps:
(I) diluted release medicament: diluting the seaweed organic polymer odor treatment agent with clear water;
(II) spraying or sprinkling the diluted seaweed organic polymer peculiar smell treating agent to polluted regional air by using a continuous or intermittent spraying system or a sprinkling system.
2. The method for treating malodorous gases and VOC according to claim 1, wherein the pressure injection pipe network in step (1) is a network structure formed by a plurality of plastic pipes arranged in a crisscross manner, the diameter of the plastic pipes is 3/4-5 inches, and the distance between adjacent plastic pipes is 3-6 feet.
3. The method for treating malodorous gases and VOCs (volatile organic compounds) according to claim 1, wherein the mass percentage of the industrial hydrogen peroxide or organic acid to the clean water in the step (2) is 10-40%: 90-60%, preferably, the organic acid is citric acid or oxalic acid.
4. The method for treating malodorous gases and VOCs of claim 1 or 3, wherein the amount of the seaweed organic polymer oxidant injected in step (3) is 1-5% of the total volume of the treated solid waste or contaminated soil, and the amount of the hydrogen peroxide solution or organic acid diluted solution injected is 10-40% of the total volume of the treated solid waste or contaminated soil.
5. The method for treating malodorous gases and VOCs of claim 1, wherein the seaweed organic polymer oxidant of step (3) is prepared by the following steps: stirring and crushing the deep sea seaweed, adding 35% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, and filtering to obtain the seaweed organic polymer oxidant.
6. The method according to claim 1, wherein the pH of the oxidizing agent is 10.5-11.5.
7. The method for treating malodorous gases and VOCs according to claim 1, wherein the mass ratio of the seaweed organic polymer odor treating agent to the clean water in step (I) is 1: 10-100.
8. The method for treating malodorous gases and VOCs of claim 1 or 7, wherein the seaweed organic polymer odor treating agent of step (II) is prepared by the following steps: stirring and crushing the deep sea seaweed, adding 3% sulfuric acid by mass percent for acidification treatment, adding 3% sodium hydroxide by mass percent for leaching and filtering, and adding 10-50% deionized water to obtain the seaweed organic polymer peculiar smell treating agent.
9. The method according to claim 8, wherein the pH of the odor-removing agent is 6.5-7.5.
10. The method according to claim 1, wherein the method is suitable for one or more of the treatment of malodorous gas in garbage dump of refuse landfill, the treatment of malodorous gas and VOC in polluted soil, the treatment of malodorous gas in garbage collection station, and the treatment of malodorous gas in garbage transfer station.
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