Residue soil based light porous filling body for purifying waste gas and waste water and application method thereof

Abstract

The invention discloses a muck-based lightweight porous filling body for purifying waste gas and waste water and an application method of the muck-based lightweight porous filling body, a plurality of mutually communicated pores are formed on the muck-based lightweight porous filling body, and the pores are loaded with a purifying material which can purify waste water and / or waste gas passing through the pores. Compared with a traditional closed hole type porous filling body, the muck-based light porous filling body in the technical scheme belongs to an open hole type, has high adsorption capacity, and can be used as a multifunctional purifying body to provide a purifying function for low-concentration wastewater purification and waste gas treatment after being loaded with a purifying material; therefore, the function of purifying the environment is realized on the basis of providing a filling function.

Description

Technical Field

[0001] The invention relates to the technical field of filling bodies, in particular to a slag-based lightweight porous filling body for purifying waste gas and waste water and an application method thereof. Background Art

[0002] In the related technology, commonly used construction methods, such as backfilling, mainly include directly backfilling sand, gravel, soil, or using fluidized concrete, foamed concrete, foamed soil and other materials for backfilling. The main function of these backfill materials is to fill the space and bear the load, which is suitable for scenes such as roadbed and foundation construction. However, this type of traditional backfill material has obvious functional limitations. It only has the function of filling and bearing, and does not have the function of environmental pollution control, and cannot effectively respond to the needs of pollutant treatment in the underground environment.

[0003] Specifically, the related technology has the following problems:

[0004] (1) Single filling function: Traditional gravel, soil and fluid fillers can only provide filling functions and are used to reinforce roadbeds or building foundations, but they have no positive effect on environmental protection and do not have pollution control functions. If the filler is eroded by pollutants, it will often lead to further environmental pollution, which is difficult to deal with and may even have a harmful impact on the ecological environment.

[0005] (2) Limitations of groundwater purification technology: In response to the problem of groundwater pollution, the existing permeable reaction wall and barrier wall combination structure (such as CN117023839A) can remove pollutants in groundwater through reactive fillers, but its scope of application is limited to groundwater treatment and it does not have a filling function. This type of structure can only purify groundwater and cannot be used for gas pollution control, lacking flexible application scenarios. In addition, the structure does not involve the resource utilization of waste. Once the reaction material of the permeable reaction wall reaches a saturated state, it is extremely difficult to replace and maintain. Its structure is complex, its mass is large, and it is divided into multiple parts such as permeable walls and barrier walls, making it difficult to achieve an integrated design.

[0006] (3) Deficiencies of porous filling materials: Although existing materials such as foamed concrete and foamed soil have porous structures, their pore opening rate is low and their connectivity with the outside world is insufficient, resulting in poor water permeability and air permeability. These materials contribute to reducing the quality of filling materials, but they do not have the function of controlling environmental pollution, so they are difficult to use in scenarios that require pollutant purification.

[0007] In summary, the filling materials used in the current filling technology lack environmental pollution control functions, and the application scenarios are relatively single, which makes it difficult to meet the needs of modern underground engineering for environmental protection and waste resource utilization. These shortcomings have caused obvious restrictions on the application of filling materials in groundwater and gas purification. Summary of the invention

[0008] The main purpose of the present invention is to provide a slag-based lightweight porous filling body for purifying waste gas and waste water and an application method thereof, aiming to at least solve the technical problem that the filling body in the related art lacks the environmental pollution control function.

[0009] To achieve the above object, the technical solution of the present invention is as follows:

[0010] According to a first aspect of the present invention, there is provided a slag-based lightweight porous filling body for purifying waste gas and waste water, wherein a pore structure is formed on the slag-based lightweight porous filling body, and the pore structure comprises a plurality of interconnected pores; wherein the pores are used to load purification materials, and the purification materials are used to purify waste water and / or waste gas passing through the pores.

[0011] The second aspect of the present invention provides an application method of a slag-based lightweight porous filling body, the application method comprising: during the construction of infrastructure, filling the slag-based lightweight porous filling body loaded with purification materials in the available underground space, and purifying wastewater and / or waste gas through the slag-based lightweight porous filling body.

[0012] The slag-based lightweight porous filling body for purifying waste gas and waste water of the present invention and its application method are based on the formation of a plurality of interconnected pores on the slag-based lightweight porous filling body, and the pores are loaded with purification materials, and the purification materials can purify the waste water and / or waste gas passing through the pores. That is, compared with the traditional closed-pore porous filling body, the slag-based lightweight porous filling body of the present technical solution is an open-pore type, with a larger specific surface area and open porosity, and a stronger adsorption capacity is formed through a plurality of interconnected pores. After being loaded with purification materials, it can be used as a multifunctional purification body to provide purification functions for low-concentration waste water purification and waste gas treatment, thereby realizing the function of purifying the environment on the basis of providing the filling function.

[0013] In addition, the present invention also has the following beneficial effects:

[0014] (1) Break through the limitations of traditional filling materials’ single filling and mechanical functions.

[0015] (2) The fill body can be poured and filled during infrastructure construction, and gas and liquid flow control channels can be set up at the same time. The upper space can be used for public facilities such as lawns, parks, and basketball courts, realizing the combination of infrastructure construction and environmental purification functions, which is more economical.

[0016] (3) Using a large amount of waste soil as raw material not only effectively consumes the soil and solves the problem of its whereabouts, but also realizes the resource utilization of the waste soil, which meets environmental protection requirements.

[0017] (4) It has a high porosity and connectivity, allowing air and water to pass through the fill. The functional materials in it can effectively filter and purify low-concentration pollutants, making it suitable for water and air purification.

[0018] (5) The fill body adopts a modular structure. If the load material reaches adsorption saturation, it can be updated by excavation and replacement or reversible adsorption, which is convenient for maintenance and enhances the sustainability and economy of the purification device.

[0019] (6) The filling function and the purification function are organically combined. The fill body itself has the benefit of environmental purification. At the same time, it is harmless and pollution-free. It has the characteristics of light weight and porousness, and uses less material, which reduces the weight of the fill body and the construction cost.

[0020] In summary, the slag-based lightweight porous filling body has significantly improved the application effect of existing technologies in terms of structural design, environmental benefits and resource utilization, and has the functions of filling, purification and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a process for applying a soil-based lightweight porous filling material provided in an embodiment of the present application;

[0023] Figure 2 is a schematic diagram of the performance of ordinary porous fill in water;

[0024] Figure 3 This is a schematic diagram of the performance of the soil-based lightweight porous filling body in water in the embodiment of the present application;

[0025] Figure 4 A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying exhaust gas (longitudinal channel arrangement method);

[0026] Figure 5 A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying exhaust gas (longitudinal channel arrangement method);

[0027] Figure 6 A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying exhaust gas (longitudinal channel arrangement method);

[0028] Figure 7A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying exhaust gas (longitudinal channel arrangement method);

[0029] Figure 8 A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying exhaust gas (lateral channel arrangement method);

[0030] Fig. 9 A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying exhaust gas (lateral channel arrangement method);

[0031] Fig.10 A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying wastewater;

[0032] Fig.11 A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying wastewater.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0035] It should be noted that related terms such as "first", "second", etc. can be used to describe various components, but these terms do not limit the components. These terms are only used to distinguish one component from another component. For example, without departing from the scope of the present invention, a first component can be referred to as a second component, and the second component can similarly be referred to as a first component. The term "and / or" refers to any one or more combinations of related items and description items ("A and / or B" is an expression indicating a selection relationship, which can include the following three situations: only A, only B, and both A and B).

[0036] An embodiment of the present application provides a slag-based lightweight porous filling body for purifying waste gas and waste water. A pore structure is formed on the slag-based lightweight porous filling body, and the pore structure includes a plurality of interconnected pores. The pores are used to load purification materials, and the purification materials are used to purify the waste water and / or waste gas passing through the pores.

[0037] That is, this technical solution has a strong adsorption capacity through the multiple interconnected pores of the slag-based lightweight porous filling body. After loading the purification material, it can be used as a multifunctional purification body to provide purification function for low-concentration wastewater purification and waste gas treatment, thereby realizing the environmental purification function on the basis of providing the filling function.

[0038] In an optional implementation manner of this embodiment, the slag-based lightweight porous filling body has a large specific surface area, which can enhance adsorption capacity, improve purification efficiency, support multifunctional material loading, increase contact reaction space, etc.

[0039] In the optional implementation of this embodiment, the porosity of the soil-based lightweight porous compact is 10-80%; the high porosity brings significant air and water permeability, allowing the compact to quickly pass air and moisture. This feature is particularly suitable for wastewater purification and waste gas treatment, ensuring that pollutants can smoothly enter the compact and fully contact with the purification materials in the pores, thereby achieving efficient adsorption and degradation effects. At the same time, it shows that most of the pores inside the compact are interconnected, which is conducive to the circulation of gas and liquid, so as to further ensure that the compact can continuously and effectively purify and filter pollutants in water or air, and adapt to application scenarios that require good permeability.

[0040] Based on the specific surface area and porosity of the above-mentioned slag-based lightweight porous filling body, it can be seen that the slag-based lightweight porous filling body of the embodiment of the present application is an open-pore porous filling body, which is significantly different from the traditional closed-pore porous filling body. Therefore, the slag-based lightweight porous filling body of the embodiment of the present application has better air permeability, water permeability and purification function, and is suitable for a variety of environmental governance and engineering filling applications.

[0041] In an optional implementation of this embodiment, the purification material includes at least one of metal oxides, oxidants, nanomaterials, and polymer materials. Specifically, the slag-based lightweight porous filling body can effectively remove various pollutants by loading different purification materials to form different purification functions.

[0042] It should be noted that the purification material can also be other materials with purification functions, which can be selected according to actual purification needs and will not be elaborated here.

[0043] In an optional implementation of this embodiment, the permeability coefficient of the soil-based lightweight porous filling body is 1×10 -1 m / s to 1×10 -4 m / s. This permeability coefficient range provides good water permeability for the fill, ensuring that pollutants can slowly penetrate through the fill and fully contact with the purification materials therein, achieving effective purification treatment effects.

[0044] In addition, the unconfined compressive strength of the fill body ranges from 300-1500kPa, which has good compressive resistance. This strength range can be achieved by adjusting the material ratio, molding process and curing conditions to meet the different engineering load requirements, that is, it can be adjusted according to the needs of the project.

[0045] In an optional implementation of this embodiment, the muck-based lightweight porous filling body includes a plurality of types of filling body modules, and different types of filling body modules are loaded with different purification materials.

[0046] Specifically, the soil-based lightweight porous fill can be designed into multiple types of fill modules, each type of fill module is loaded with different purification materials, so as to achieve more efficient purification for different pollutants. This modular design can flexibly combine various purification materials according to different pollutant characteristics and treatment requirements, and achieve multi-level and multi-functional purification effects.

[0047] In an optional implementation manner of this embodiment, the proportions of the components in the slag-based lightweight porous filling body include 100 parts of dry slag, 20-30 parts of geopolymer-based curing agent, 65-75 parts of water, 0.185-0.205 parts of thickener, 2.775-6.15 parts of pore opening agent, and foam (generally 2% to 4% of the total mass); wherein the geopolymer-based curing agent includes cement, kaolin, and water glass in a mass ratio of 32:48:20.

[0048] See also Figure 1 The present application also provides an application method of a slag-based lightweight porous filling body, the application method comprising:

[0049] Step S101, during the construction of infrastructure, a lightweight porous filling body based on slag and loaded with purification materials is filled in the available underground space;

[0050] Step S102, purifying wastewater and / or waste gas by using the slag-based lightweight porous filling body.

[0051] In this embodiment, the lower space that can be developed is fully utilized during the construction of infrastructure, and a lightweight porous filling body based on slag is built to form a purification body that does not occupy any space. The surface space above the filling body can still be used to set up infrastructure such as parks and basketball courts to achieve the purification function of the infrastructure.

[0052] In an optional implementation of this embodiment, after the step of filling the available underground space with a slag-based lightweight porous filling body loaded with purification materials, it also includes: after the purification treatment, the use status of the purification material is detected, and when the use status of the purification material reaches saturation, the slag-based lightweight porous filling body is replaced by excavation or the purification material is treated by reversible adsorption.

[0053] Specifically, through the above-mentioned steps of detecting the usage status of the purification material, subsequent replacement, reversible adsorption, etc., whether by replacing the slag-based lightweight porous filling body or regenerating the reversible adsorption material, it is ensured that the purification material can operate efficiently for a long time, effectively control pollutants in wastewater / waste gas, and have environmental purification functions, especially suitable for scenes such as industrial parks and nature reserves.

[0054] It is necessary to further explain here that there are significant differences between the slag-based lightweight porous compacts in the embodiment of the present application and the conventional common porous compacts, and the specific analysis is as follows:

[0055] See also Figure 2 and Figure 3 By comparing the two figures, we can see the difference in the performance of two different types of soil-based porous filling materials in water: one is a closed-cell ordinary porous filling material ( Figure 2 ), the other is an open-cell soil-based lightweight porous filling body ( Figure 3 ). Figure 2 The density is 600kg / m 3 The ordinary porous filling body floats in the water, while the open-pore soil-based lightweight porous filling body of the embodiment of the present application is completely submerged in the water.

[0056] It can be seen that, on the one hand, there is a difference in material structure between slag-based lightweight porous filling and ordinary porous filling, that is, ordinary porous filling cannot quickly penetrate fluids such as water due to its closed pore structure. In contrast, slag-based lightweight porous filling has a connected pore structure, and fluids such as water can quickly penetrate; on the other hand, there is a difference in permeability between slag-based lightweight porous filling and ordinary porous filling. The pore structure of slag-based lightweight porous filling allows water to penetrate freely, which is conducive to providing good water flow permeability in the purification path, improving the contact efficiency with pollutants, and is suitable for application scenarios of infiltration purification. The closed pore structure of ordinary porous filling limits the penetration of water, so the permeability coefficient is low, and it may not be suitable for scenarios that require high permeability. On the third hand, there is a difference in application adaptability between slag-based lightweight porous filling and ordinary porous filling. Slag-based lightweight porous filling can better realize the circulation of water and the removal of pollutants in the purification system, and is suitable for purification paths that require high permeability and high flowability. However, ordinary porous filling bodies are only suitable for lightweight filling materials and do not have the function of purifying wastewater or waste gas.

[0057] See also Figures 4 to 7 , which shows a schematic diagram of a scenario in which the application method of this embodiment is used to purify exhaust gas (longitudinal channel arrangement method). The application method further includes the following steps:

[0058] In the underground available space below the ground surface 303, a construction area 200 is constructed by excavating a machine pit, setting a drainage outlet 201, and building an anti-seepage barrier layer 202;

[0059] A channel partition 301 is set, a corresponding purification path is confirmed in the construction area 200, a lightweight porous filling body 300 based on slag is filled, and a discharge inlet 302 is constructed;

[0060] Construct upper facilities and install pressure pump 402 to sequentially purify the exhaust gas flowing into the purification path according to channel flow direction 401;

[0061] Replace the purification material when it is saturated ( Figure 7 The mark 500 in the middle indicates that the saturated purification material in the soil-based lightweight porous filling mass.

[0062] Through the above steps, an efficient construction area can be constructed under the surface 303, and the waste gas can be purified step by step along the purification path by relying on the driving effect of the pressure pump 402. The whole system is reasonably designed to achieve graded treatment of waste gas or wastewater, and supports regular replacement or regeneration of purification materials to ensure long-term purification effect.

[0063] In addition, see Figures 8 to 9 , which shows a schematic diagram of a scenario in which the application method of this embodiment is used to purify exhaust gas (lateral channel arrangement method).

[0064] See also Figure 10 to Figure 11 , which shows a schematic diagram of a scenario in which the application method of this embodiment is used to purify wastewater. The application method further includes the following steps:

[0065] In the underground available space below the ground surface 303, a construction area is constructed by excavating a machine pit, setting a wastewater outlet 600, and constructing an anti-seepage barrier layer 202;

[0066] Confirm the corresponding purification path and fill the soil-based lightweight porous filling body 300;

[0067] The low-concentration wastewater pre-treated by the factory flowing into the purification path is purified in turn and discharged into the drainage channel 601.

[0068] Through the above steps, a purification construction area is constructed in the underground available space below the surface 303 to treat the incoming low-concentration wastewater.

[0069] In summary, the slag-based lightweight porous filling body for purifying waste gas and waste water and its application method in the embodiment of the present application are based on the fact that the slag-based lightweight porous filling body is an open-pore type, has a large specific surface area and porosity, and has multiple interconnected pores, and the pores are loaded with purification materials. That is, the technical solution has a strong adsorption capacity through the multiple interconnected pores of the slag-based lightweight porous filling body. After loading the purification material, it can be used as a multifunctional purification body to provide purification functions for low-concentration wastewater purification and waste gas treatment, thereby realizing the function of purifying the environment on the basis of providing the filling function.

[0070] In addition, the embodiments of the present application also have many beneficial effects:

[0071] (1) High-efficiency purification function: Due to the high porosity and permeability of the fill, its structure can carry a variety of purification materials and is suitable for the purification of waste gas and low-concentration wastewater.

[0072] (2) Efficient use of the lower space with purification function: During the construction of infrastructure, the fill can make full use of the underground developable space without occupying additional surface space. At the same time, parks, basketball courts and other infrastructure can still be set up above it to achieve multifunctional development of surface and underground space, which not only meets the needs of public facilities, but also provides environmental purification function for the infrastructure.

[0073] (3) Carbon fixation and strength improvement: The fill material itself is alkaline and can absorb carbon dioxide in the air to achieve carbon fixation. When the fill material is used for roadbed, after it is saturated with carbon dioxide and carbonized, its strength is improved, thereby enhancing the support and durability of the roadbed and having a good structural reinforcement effect.

[0074] (4) Easy maintenance and regeneration: The modular design of the fill allows the purification materials therein to be partially excavated and replaced after saturation, or the reversible adsorption technology can be used to regenerate the materials, ensuring the long-term stable operation of the purification system and reducing maintenance costs.

[0075] (5) Resource utilization of slag, green and environmentally friendly: The fill body uses a large amount of slag as the main raw material, effectively realizing the resource utilization of slag. The fill body itself is lightweight and porous, saving a lot of construction raw materials and reducing construction costs. At the same time, its green and environmentally friendly characteristics meet the requirements of sustainable development and provide an innovative solution for the recycling of waste.

[0076] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A soil-based lightweight porous filling body for purifying waste gas and waste water, characterized in that: A pore structure is formed on the soil-based lightweight porous filling body, and the pore structure includes a plurality of pores interconnected with each other; The pores are used to load purification materials, and the purification materials are used to purify waste water and / or waste gas passing through the pores.

2. The soil-based lightweight porous filling body for purifying waste gas and waste water according to claim 1, characterized in that: The open porosity of the slag-based lightweight porous filling body is 10-80%.

3. The soil-based lightweight porous filling body for purifying waste gas and waste water according to claim 1, characterized in that: The purification material includes at least one of metal oxides, oxidants, nanomaterials, and polymer materials.

4. The soil-based lightweight porous filling body for purifying waste gas and waste water according to claim 1, characterized in that: A plurality of types of filling body modules are formed on the muck-based lightweight porous filling body, and different types of filling body modules are loaded with different purification materials.

5. The soil-based lightweight porous filling body for purifying waste gas and waste water according to claim 1, characterized in that: The permeability coefficient of the soil-based lightweight porous filling body is 1×10 -1 m / s to 1×10 -4 m / s, and the unconfined compressive strength is 300-1500kPa.

6. The slag-based lightweight porous filling body for purifying waste gas and wastewater according to claim 1, characterized in that the slag-based lightweight porous filling body comprises 100 parts of dry slag, 20-30 parts of geopolymer-based curing agent, 65-75 parts of water, 0.185-0.205 parts of thickener, and 2.775-6.15 parts of pore opening agent; in, The geopolymer-based curing agent comprises cement, metakaolin and water glass in a mass ratio of 32:48:

20.

7. A method for applying the soil-based lightweight porous filling material according to any one of claims 1 to 6, characterized in that: The application method comprises: During the construction of infrastructure, the underground space can be used to fill the soil-based lightweight porous filling body loaded with purification materials; The waste water and / or waste gas is purified by the slag-based lightweight porous filling body.

8. The application method according to claim 7, characterized in that: After the step of filling the available underground space with the slag-based lightweight porous filling body loaded with purification materials, the method further includes: After the purification process, detecting the usage status of the purification material; When the use state of the purification material reaches saturation, the purification material is treated by excavating and replacing the soil-based lightweight porous filling body or by adopting a reversible adsorption method.

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