Slag-based lightweight porous filling body for purifying waste gas and waste water and its application method

Abstract

The present invention discloses a slag-based lightweight porous compact for purifying waste gas and wastewater, and its application method. The slag-based lightweight porous compact has multiple interconnected pores, and the pores are loaded with a purification material. The purification material can purify the wastewater and / or waste gas passing through the pores. Compared with traditional closed-pore porous compacts, the slag-based lightweight porous compact of this technical solution is open-pore and has a stronger adsorption capacity. After loading the purification material, it can serve as a multifunctional purifier for low-concentration wastewater purification and waste gas treatment, thereby achieving environmental purification on top of its filling function.

Description

Technical Field

[0001] The present 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] Common construction methods in related technologies, such as backfilling, mainly include directly backfilling with sand, gravel, and soil, or using materials such as fluidized concrete, foamed concrete, and foamed soil for backfilling. The main function of these backfill materials is to fill space and bear loads, and they are suitable for scenarios such as roadbeds and foundation buildings. However, these traditional backfill materials have obvious functional limitations. They only have filling and load-bearing functions, lack environmental pollution control functions, and cannot effectively respond to the needs of pollutant treatment in underground environments.

[0003] Specifically, the related technologies have the following problems:

[0004] (1) Single filling function: Traditional sand, gravel, soil, and fluidized 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 application scope 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 it. Its structure is complex, the mass is large, and it is divided into multiple parts such as the permeable wall and the barrier wall, making it difficult to achieve an integrated design.

[0006] (3) Disadvantages of porous fill: Although existing materials such as foam concrete and foam soil have porous structures, their pore opening ratio is low, resulting in insufficient connectivity with the outside world and poor water and air permeability. These materials contribute to reducing the quality of fill, but do not have environmental pollution control functions, making them difficult to use in scenarios requiring pollutant purification.

[0007] In summary, the fill materials used in current landfill technologies lack environmental pollution control capabilities, have limited application scenarios, and are unable to meet the environmental protection and waste resource utilization needs of modern underground engineering projects. These shortcomings significantly limit the application of fill materials in groundwater and gas purification. Summary of the Invention

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

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

[0010] In a first aspect of the present invention, a slag-based lightweight porous filling body for purifying waste gas and waste water is provided, wherein a pore structure is formed on the slag-based lightweight porous filling body, and the pore structure includes a plurality of interconnected pores; wherein the pores are used to load a purification material, and the purification material is used to purify the 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, which includes: 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 exhaust gas through the slag-based lightweight porous filling body.

[0012] The present invention's lightweight, porous slag-based compact for purifying waste gas and wastewater, and its application method, utilizes multiple interconnected pores formed within the compact. These pores are loaded with a purification material, which purifies wastewater and / or waste gas passing through the pores. Compared to conventional closed-pore porous compacts, the lightweight, porous slag-based compact of this technical solution is open-pore, possessing a larger specific surface area and porosity. These multiple interconnected pores provide a stronger adsorption capacity. When loaded with the purification material, the compact can function as a multifunctional purifier, providing purification capabilities for low-concentration wastewater purification and waste gas treatment, thereby achieving environmental purification in addition to its 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 can be poured and filled during the construction of infrastructure, 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 the requirements of environmental protection.

[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 adopts a modular structure. If the load material reaches adsorption saturation, it can be replaced by excavation or updated by reversible adsorption. It 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 filling body itself has the benefit of environmental purification. At the same time, it is harmless and pollution-free. It has lightweight and porous characteristics, and uses less material, which reduces the weight of the filling body and the construction cost.

[0020] In summary, the slag-based lightweight porous filling material significantly improves 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic flow chart of the application method of the muck-based lightweight porous filling material provided in the embodiment of the present application;

[0023] Figure 2 Schematic diagram of the performance of ordinary porous fill in water;

[0024] Figure 3 Schematic diagram of the performance of the soil-based lightweight porous filling material in water in an 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 (horizontally arranged channel method);

[0030] Figure 9 A schematic diagram of a scenario corresponding to the application method of an embodiment of the present application for purifying exhaust gas (horizontally arranged channel method);

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

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

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

[0034] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended 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. For example, without departing from the scope of the present invention, the first component can be referred to as the second component, and the second component can similarly be referred to as the 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 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 an optional implementation of this embodiment, the porosity of the soil-based lightweight porous compact is 10-80%. The high porosity provides significant air and water permeability, allowing the compact to quickly pass air and moisture. This property is particularly suitable for wastewater purification and waste gas treatment, ensuring that pollutants can smoothly enter the compact and fully contact the purification material in the pores, thereby achieving efficient adsorption and degradation effects. It also shows that most of the pores inside the compact are interconnected, which is conducive to the circulation of gas and liquid, further ensuring that the compact can continuously and effectively purify and filter pollutants in water or air, and is suitable for application scenarios requiring 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 a metal oxide, an oxidant, a nanomaterial, and a polymer material. Specifically, the slag-based lightweight porous filling body can be loaded with different purification materials to achieve different purification functions, thereby effectively removing various pollutants.

[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 material 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] Furthermore, the unconfined compressive strength of the compacted material ranges from 300-1500 kPa, demonstrating excellent compressive performance. This strength range can be achieved by adjusting the material mix, molding process, and curing conditions to suit different engineering load-bearing requirements, allowing for adjustments based on project needs.

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

[0046] Specifically, lightweight porous landfill can be designed into multiple types of modules, each loaded with different purification materials, enabling more efficient purification of different pollutants. This modular design allows for flexible combinations of purification materials based on the characteristics of different pollutants and treatment requirements, achieving multi-level, multi-functional purification effects.

[0047] In an optional implementation manner of this embodiment, the proportions of the components in the slag-based lightweight porous fill include 100 parts of dry slag, 20-30 parts of a geopolymer-based curing agent, 65-75 parts of water, 0.185-0.205 parts of a thickener, 2.775-6.15 parts of a pore opening agent, and foam (generally 2% to 4% of the total mass); wherein the geopolymer-based curing agent includes cement, metakaolin, 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 soil-based lightweight porous filling body loaded with purification materials is filled in the available underground space;

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

[0051] In this embodiment, the exploitable lower space is fully utilized during infrastructure construction, with a lightweight, porous fill based on slag soil, creating a purification structure that takes up no space. The surface space above the fill can still be used to house infrastructure such as parks and basketball courts, achieving infrastructure-attached purification capabilities.

[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 fill 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 / exhaust gas, and have environmental purification functions, especially suitable for scenarios such as industrial parks and nature reserves.

[0054] It is necessary to further explain that there are significant differences between the soil-based lightweight porous compacts in the embodiments of the present application and conventional porous compacts. 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-pore ordinary porous filling material ( Figure 2 ), the other is an open-cell slag-based lightweight porous filling body ( Figure 3 ). Figure 2 The density shown is 600kg / m 3 The conventional porous compacts float in water, while the open-pored soil-based lightweight porous compacts according to the embodiment of the present application completely sink in water.

[0056] As can be seen, first, there are differences in material structure between slag-based lightweight porous compacts and conventional porous compacts. The closed pore structure of conventional porous compacts prevents rapid penetration of fluids such as water. In contrast, slag-based lightweight porous compacts have a connected pore structure, allowing rapid penetration of fluids such as water. Second, there are differences in permeability between slag-based lightweight porous compacts and conventional porous compacts. The pore structure of slag-based lightweight porous compacts allows water to penetrate freely, which facilitates good water flow and permeability in the purification pathway, improving contact efficiency with pollutants and making it suitable for osmotic purification applications. In contrast, the closed pore structure of conventional porous compacts restricts water penetration, resulting in a lower permeability coefficient and may not be suitable for applications requiring high permeability. Third, there are differences in application adaptability between slag-based lightweight porous compacts and conventional porous compacts. Slag-based lightweight porous compacts can better facilitate water flow and pollutant removal in purification systems, making them suitable for purification pathways requiring high permeability and high flow. Ordinary porous filling bodies are only suitable for lightweight filling materials and do not have the function of purifying wastewater and exhaust 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 pit, setting a drainage outlet 201, and building an anti-seepage barrier layer 202;

[0059] Set up channel partitions 301, confirm the corresponding purification path in the construction area 200, fill the soil-based lightweight porous filling body 300, and build a discharge inlet 302;

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

[0061] Replace the saturated purification material ( Figure 7 The mark 500 in the middle indicates that the saturated purification material in the soil-based lightweight porous fill).

[0062] Through the above steps, an efficient construction area can be constructed beneath the surface 303. The waste gas is then purified step by step along the purification path, driven by the pressure pump 402. The entire system is rationally designed, enabling tiered treatment of waste gas or wastewater and supporting the regular replacement or regeneration of purification materials to ensure long-term purification effectiveness.

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

[0064] See also Figures 10 and 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 usable space below the ground surface 303, a construction area is constructed by excavating a pit, setting up a wastewater outlet 600, and building 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 inflowing low-concentration wastewater.

[0069] In summary, the slag-based lightweight porous packing for purifying waste gas and wastewater and its application method according to the embodiments of the present application are based on the fact that the slag-based lightweight porous packing is open-pore, has a large specific surface area and porosity, and simultaneously forms multiple interconnected pores, and that the pores are loaded with purification materials. In other words, this technical solution, through the multiple interconnected pores of the slag-based lightweight porous packing, has a strong adsorption capacity. After being loaded with purification materials, it can serve as a multifunctional purification body to provide purification functions for low-concentration wastewater purification and waste gas treatment, thereby achieving environmental purification functions on top of providing filling functions.

[0070] In addition, the embodiments of the present application also have multiple 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 lower space with additional purification function: During the construction of infrastructure, the fill can fully utilize the underground developable space without occupying additional surface space. At the same time, infrastructure such as parks and basketball courts can still be set up above it, realizing the multifunctional development of surface and underground space, which not only meets the needs of public facilities but also provides an environmental purification function for the infrastructure.

[0073] (3) Carbon fixation and strength enhancement: The fill itself is alkaline and can absorb carbon dioxide from the air, achieving a carbon fixation effect. When the fill is used for roadbed, after it is saturated with carbon dioxide and carbonized, its strength increases, thereby enhancing the support and durability of the roadbed and providing 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, and reversible adsorption technology can also 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, Environmentally Friendly: This landfill uses a large amount of slag as its main raw material, effectively realizing the resource utilization of slag. The landfill itself is lightweight and porous, saving a large amount of construction materials and reducing construction costs. At the same time, its 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 aforementioned method embodiments, for ease of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

[0077] In the above embodiments, the description of each embodiment has its own focus. 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 description 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 lightweight porous filling material based on slag 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 interconnected pores; The pores are used to carry purification materials, and the purification materials are used to purify wastewater and / or waste gas passing through the pores; The open porosity of the soil-based lightweight porous filling body is 10-80%; The purification material includes at least one of metal oxides, oxidants, nanomaterials, and polymer materials; The soil-based lightweight porous filling material comprises 100 parts of dry soil, 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; The geopolymer-based curing agent comprises cement, metakaolin and water glass in a mass ratio of 32:48:

20.

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

3. The soil-based lightweight porous filling material for purifying waste gas and wastewater 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.

4. A method for using the soil-based lightweight porous filling material according to any one of claims 1 to 3, 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 muck-based lightweight porous filling body.

5. The application method according to claim 4, characterized in that: After the step of filling the available underground space with the soil-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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