A pollution-reducing and carbon-reducing buffer cover system for landfills

Abstract

The present invention relates to the technical field of landfill treatment, and provides a pollution-reducing and carbon-reducing buffer cover layer system for a landfill, comprising a cover layer group laid above the landfill, and a recharge system for providing recharge liquid to the cover layer; the cover layer group comprises a first cover layer, an irrigation layer, a second cover layer and an ecological layer, the first cover layer is prepared by mixing steel slag and municipal sludge as the main matrix materials with lime; the second cover layer is prepared by mixing steel slag and municipal sludge as the main matrix materials with humus soil; the filling layer is prepared by mixing steel slag and municipal sludge; the present invention adopts the cover layer group and the recharge system to form a buffer cover layer system, the overall system structure is reasonably designed, has the resource treatment function of treating waste with waste, has better carbon reduction effect, and has the advantages of easy construction and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of landfill treatment, and in particular to a pollution-reducing and carbon-reducing buffer cover system for landfills. Background Art

[0002] Municipal solid waste landfills are significant sources of CH4 and N2O emissions. CH4 production primarily stems from the anaerobic degradation of organic components in landfilled municipal solid waste, accounting for over 10% of global CH4 emissions. Landfill treatment produces landfill gas (CH4) and leachate, with potential pollution potentially lasting for over 50 years. Leachate contains significant amounts of organic and inorganic matter, with chemical oxygen demand (COD) and ammonia nitrogen levels reaching tens of thousands and thousands of mg / L, respectively. The denitrification process releases significant amounts of N2O. Landfills not only occupy significant land and pollute the environment, but also continuously release greenhouse gases, creating a significant shortcoming in promoting ecological progress and achieving the dual carbon goals. Therefore, reducing CH4 and N2O emissions from landfills, controlling leachate pollution, and promoting synergistic improvements in landfill pollution and carbon reduction have become urgent tasks in preventing and controlling environmental pollution and formulating a scientific action plan for achieving my country's carbon peak.

[0003] Landfill cover is an important barrier to the release of CH4 and N2O into the environment after they are generated. The oxidation capacity of soil cover for CH4 is related to the organic matter content of the soil. The oxidation capacity of fertile soil with high organic matter is higher than that of poor soil with low organic matter. The intensity of soil nitrification-denitrification is positively correlated with the amount of N2O released. The amount released by fertile soil is correspondingly higher than that of poor soil. PE cover blocks CH4 from entering the soil layer, inhibiting the oxidation of soil CH4. The main way leachate irrigation affects CH4 emissions is that the oxygen consumption of easily degradable organic matter limits the oxidation of methane and NH4 + -N inhibits methane oxidizing bacteria; the former can eliminate the effect by irrigating stable leachate with BOD5 / COD < 0.15, while the latter can be controlled by limiting the irrigation load. The impact of leachate irrigation on N2O emissions is mainly manifested as NH4 + After soil nitrification, N-N denitrifies to produce N2O when biodegradable organic matter is insufficient. N2O generation can be reduced through load control and vegetation absorption, so leachate recharge and biomass can effectively reduce CH4 emissions. Leachate treatment is a high-emission source of N2O, with N2O emissions far exceeding those in landfill areas. Leachate recharge reduces the concentrations of pollutants such as COD and ammonia nitrogen in the leachate. COD is a key factor affecting N2O release from leachate, so leachate recharge can effectively reduce N2O emissions.

[0004] The current landfill cover does not have the function of combining greenhouse gases from landfills with leachate to reduce pollution and achieve synergistic pollution control. Summary of the Invention

[0005] The purpose of the present invention is to address the defects of the above-mentioned prior art and provide a pollution-reducing and carbon-reducing buffer cover system for landfills.

[0006] The technical solution of the present invention is: a pollution-reducing and carbon-reducing buffer cover system for a landfill, comprising a cover layer group laid above the landfill, and a recharge system for providing recharge fluid to the cover layer;

[0007] The cover layer group includes a first cover layer laid on top of the garbage in the landfill, an irrigation layer laid on top of the first cover layer, a second cover layer laid on top of the irrigation layer, and an ecological layer laid on top of the second cover layer;

[0008] The irrigation layer includes a geocell layer laid on the upper surface of the first covering layer, and a filling layer laid above the geocell layer and filled in the cells of the geocell layer;

[0009] The first covering layer is prepared by mixing steel slag and municipal sludge as the main matrix materials with lime; the second covering layer is prepared by mixing steel slag and municipal sludge as the main matrix materials with humus soil; the filling layer is prepared by mixing steel slag and municipal sludge;

[0010] The ecological layer includes an ecological soil layer laid on top of the second covering layer, and ecological plants planted in the ecological soil layer; a vegetation net is arranged in the ecological soil layer;

[0011] Note: The combination of steel slag and municipal sludge can utilize the FeCl in the slag. 3+ The dehydration of calcium and magnesium oxides contributes to the treatment of municipal sludge and the resource utilization of municipal sludge treatment. On the other hand, steel slag can come into contact with the water in the leachate and slowly release alkalinity, which is conducive to the further release of CH4 in the leachate. The CO2 gas released from the garbage can be adsorbed by the steel slag, further achieving a carbon reduction effect.

[0012] The Mg element in the slag and the phosphorus element in the municipal sludge mix with the high-concentration ammonia and nitrogen in the leachate to form magnesium ammonium phosphate. Magnesium ammonium phosphate, as a fertilizer, can promote the growth of ecological plants, which can further absorb CH4. In other words, part of the CH4 in the leachate recharged to the cover layer can be adsorbed by the steel slag in the cover layer, and the other part can be adsorbed by the ecological plants.

[0013] The recharge system includes a temporary storage tank group connected to the leachate disposal system of the landfill, a liquid diversion pipe group connected to the temporary storage tank group at one end, a buried pipe connected to the other end of the liquid diversion pipe group and pre-buried in the filling layer, and a sensor component for monitoring the interior of the first cover layer and the second cover layer;

[0014] The liquid inlet pipe group includes a pipe pump group connected to the temporary storage tank group at one end, a backwash filter device arranged on the pipe of the pipe pump group, and a liquid separation component connected to the other end of the pipe pump group at one end; the buried pipe is connected to the other end of the liquid separation component;

[0015] Description: The leachate is reinjected into the stabilized garbage using the reinjection system to form a bioreactor. On the one hand, it can inhibit the production of CH4, and on the other hand, it can reduce the concentration of pollutants in the leachate.

[0016] Furthermore, the preparation process of the first covering layer is: according to the weight ratio, 6 to 13 parts of steel slag, 3 to 5 parts of municipal sludge, and 0.3 to 0.5 parts of auxiliary materials are mixed evenly to obtain a first mixed base material, and then the moisture content is adjusted to 8 to 10%, and then laid on top of the garbage in the landfill; the auxiliary material is lime.

[0017] Note: The first covering layer is in direct contact with the garbage in the landfill. The mixture of steel slag, municipal sludge and lime is used because it acts as the first barrier to the CO2 gas released from the garbage. Therefore, there is more steel slag than municipal sludge, and a small amount of lime can disinfect and remove odors from the garbage. In addition, natural drying is used to adjust the moisture content to 8-10%.

[0018] Furthermore, the filling layer is prepared by mixing 4 to 6 parts of steel slag and 8 to 12 parts of municipal sludge by weight, and then laying the mixture on top of the geocell layer and filling the geocell layer grids.

[0019] Note: Not adjusting the moisture content of the filling layer is conducive to the close contact between the buried pipe and the filling layer after construction. After the buried pipe is laid, the thickness of the cover above the laying is relatively small. If it is directly leveled and compacted, it will inevitably lead to the breakage of the buried pipe. Therefore, not adjusting the moisture content is the best way to achieve better density when laying by using covering materials with a higher moisture content. The filling layer serves as the second barrier to garbage, and its basis is a mixture of steel slag and municipal sludge.

[0020] Furthermore, the preparation process of the second covering layer is: according to the weight ratio, 4 to 6 parts of steel slag, 8 to 15 parts of municipal sludge, and 3 to 7 parts of auxiliary materials are evenly mixed to obtain a second mixed base material, and then the moisture content is adjusted to 15 to 18%, and then laid on top of the filling layer; the auxiliary material is humus soil.

[0021] Description: The second covering layer serves as the third barrier to garbage. It is based on a mixture of steel slag and municipal sludge as the main raw materials. It also serves as the subsequent root growth layer of ecological plants. Therefore, it needs to have a better root growth environment. The auxiliary material used is humus soil, which can provide initial nutrients for the roots of ecological plants.

[0022] Furthermore, the tube pump assembly includes a liquid diversion tube connected to the temporary storage tank assembly at one end and connected to the liquid separation assembly at the other end, and a pump body providing water diversion power for the liquid diversion tube;

[0023] The backwash filter device is arranged on the liquid inlet pipe;

[0024] The liquid separation component includes a liquid separation main tank connected to the liquid guide tube, and a plurality of liquid separation branch pipes, one end of which is respectively connected to the liquid separation main tank and the other end of which is connected to the buried pipe.

[0025] Description: The temporary storage tank group can be used to temporarily store the leachate tail water treated by the leachate disposal system, so as to facilitate the subsequent planned reinjection; the backwash filter device can filter the reinjected leachate tail water; the liquid separation component can meet the demand for sufficient liquid supply due to the large number of buried pipes in the large area of ​​the landfill.

[0026] Furthermore, the liquid separation component also includes a pressurizing component for pressurizing the liquid separation main tank.

[0027] Note: Use the pressure component to pressurize the main liquid separation tank, effectively avoiding the problem of insufficient pressure of the reinjected leachate tail water due to a large number of pipes, resulting in a poor reinjection rate.

[0028] Furthermore, the buried pipe includes a permeation main pipe installed at the other end of the liquid separation component, and multiple groups of permeation auxiliary pipe groups respectively connected to the permeation main pipe; each group of the permeation auxiliary pipe groups includes multiple connecting pipes arranged at intervals, and multiple permeation pipes arranged one-to-one on two adjacent connecting pipes.

[0029] Note: Using permeation tubes instead of sprinkler heads not only saves costs, but also effectively avoids the need for regular maintenance of sprinkler heads during subsequent use.

[0030] Furthermore, the permeation tube includes a permeation tube body provided with permeation holes on its surface and connected to the connecting tube, and a sponge column provided in the permeation tube body and having an outer wall in contact with an inner wall of the permeation tube body;

[0031] A through groove is provided inside the sponge column.

[0032] Description: The leachate tail water can penetrate into the filling layer through the permeation holes. The sponge column can effectively slow down the water flow and directly spray out to form a water column with greater impact force, thereby avoiding the problem of the sprayed water column causing a large scouring of the filling layer and causing the collapse of the covering layer group.

[0033] Furthermore, the aeration assembly includes a first aeration pipe arranged in the garbage in the landfill, a second aeration pipe arranged in the filling layer, and a fan unit connected to the first aeration pipe and the second aeration pipe.

[0034] Description: When in use, the first aeration pipe and the second aeration pipe can be used to aerate and oxygenate the garbage in the landfill.

[0035] Furthermore, the pollution reduction and carbon reduction method of the pollution reduction and carbon reduction buffer cover system includes:

[0036] S1. Construction of the covering system

[0037] After the garbage in the landfill reaches the designated location, prepare the materials required for the first covering layer and lay the materials on top of the garbage until the thickness reaches 0.5 to 1.0 m to form the first covering layer;

[0038] The geocell is then laid on top of the first cover layer to form a geocell layer;

[0039] Then prepare the material required for the filling layer and fill it into the cells of the geocell layer, continue filling the material until it is 0.05 to 0.1 m above the geocell layer, lay the buried pipe and reserve the interface, and then fill the material again to a total thickness of 0.2 to 0.3 m to form a filling layer; wherein the total thickness of the filling layer is equal to the total height of the cell height of the geocell layer and the thickness of the filling layer material above the geocell layer;

[0040] Prepare the materials required for the second covering layer and lay the materials on the filling layer until the thickness reaches 0.3 to 0.5 m to form the second covering layer;

[0041] Prepare the materials required for the ecological soil layer and lay them on top of the second covering layer, and set up a vegetation net during the laying process; then plant ecological plants to form an ecological layer;

[0042] Then connect the reserved interface with the liquid separation component, assemble the backwash filter device, the tube pump group, and the temporary storage tank group, and then connect the temporary storage tank group to the leachate disposal system of the landfill;

[0043] Then, the sensing components are arranged inside the first covering layer and the second covering layer;

[0044] S2. Operation of the covering system

[0045] The leachate tail water treated by the leachate disposal system is recharged to the cover layer group through the recharge system, and the inside of the first cover layer and the second cover layer are monitored by the sensor component; the temperature and humidity of the first cover layer and the second cover layer are specifically monitored.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The present invention adopts a covering layer group and a recharging system to form a buffer covering layer system, and the overall system structure is reasonably designed;

[0048] The covering layer group uses steel slag and municipal sludge as the main matrix materials, providing a new way to treat steel slag and municipal sludge, and realizing waste treatment by resource utilization; steel slag can absorb water in municipal sludge, achieving municipal sludge dehydration treatment and reducing municipal sludge dehydration costs; and steel slag can absorb CO2 gas released from garbage, achieving carbon reduction effects;

[0049] The recharge system recharges the leachate tail water treated by the leachate disposal system back into the cover layer. This not only forms a bioreactor inside the landfill, reducing CH4 generation from the garbage and removing the concentration of pollutants in the leachate, but also forms magnesium ammonium phosphate fertilizer with steel slag and municipal sludge, which promotes the growth of ecological plants. The ecological plants can further absorb CH4 and green the landfill.

[0050] The overall system structure of the present invention is simple, has the advantages of easy construction and low cost, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic structural diagram of embodiments 1, 2, and 3 of the present invention;

[0052] Figure 2 This is a schematic diagram of the partial structure of the covering layer groups of Examples 1, 2, and 3 of the present invention;

[0053] Figure 3 is a cross-sectional view of the cover layer groups of Examples 1, 2, and 3 of the present invention;

[0054] Figure 4 It is a schematic structural diagram of the reinjection system of embodiments 1, 2, and 3 of the present invention;

[0055] Figure 5 This is a schematic structural diagram of a recharging system according to a fourth embodiment of the present invention;

[0056] Figure 6 This is a schematic structural diagram of the buried pipe according to embodiment 5 of the present invention;

[0057] Figure 7 is an exploded view of the permeation tube of Example 5 of the present invention;

[0058] Figure 8 is a schematic structural diagram of Example 6 of the present invention;

[0059] Figure 9 is a cross-sectional view of a covering layer assembly according to Example 6 of the present invention;

[0060] Among them, 1- landfill, 2- cover layer group, 21- first cover layer, 22- irrigation layer, 221- geocell layer, 222- filling layer, 23- second cover layer, 24- ecological layer, 241- ecological soil layer, 242- ecological plants, 243- vegetation network, 3- recharge system, 31- temporary storage tank group, 32- diversion pipe group, 321- pipe pump group, 3211- diversion pipe, 3212- pump body, 322- backwash filter device, 32 3-liquid separation component, 3231-liquid separation main tank, 3232-liquid separation branch pipe, 3233-pressurization component, 33-buried pipe, 331-permeation main pipe, 332-permeation auxiliary pipe group, 333-connecting pipe, 334-permeation pipe, 3340-permeation hole, 3341-permeation pipe body, 3342-sponge column, 3343-through groove, 34-sensor component, 4-aeration component, 41-first aeration pipe, 42-second aeration pipe, 43-fan unit. DETAILED DESCRIPTION

[0061] Example 1

[0062] like Figure 1 The pollution reduction and carbon reduction buffer cover system for a landfill shown includes a cover layer group 2 laid above a landfill 1, and a recharge system 3 for providing recharge fluid to the cover layer 2;

[0063] like Figure 2 、 3 As shown, the cover layer group 2 includes a first cover layer 21 laid on top of the garbage in the landfill 1, an irrigation layer 22 laid on top of the first cover layer 21, a second cover layer 23 laid on top of the irrigation layer 22, and an ecological layer 24 laid on top of the second cover layer 23;

[0064] The irrigation layer 22 includes a geocell layer 221 laid on the upper surface of the first cover layer 21, and a filling layer 222 laid on the geocell layer 221 and filled in the cells of the geocell layer 221;

[0065] The first covering layer 21 is prepared by mixing steel slag and municipal sludge as the main matrix materials with lime; the second covering layer 23 is prepared by mixing steel slag and municipal sludge as the main matrix materials with humus soil; the filling layer 222 is prepared by mixing steel slag and municipal sludge;

[0066] The ecological layer 24 includes an ecological soil layer 241 laid on the second covering layer 23 and ecological plants 242 planted in the ecological soil layer 241; a vegetation net 243 is set in the ecological soil layer 241;

[0067] like Figure 2 、 3As shown in Figures 4 and 5, the recharge system 3 includes a temporary storage tank group 31 connected to the leachate disposal system of the landfill 1, a liquid diversion pipe group 32 connected to the temporary storage tank group 31 at one end, a buried pipe 33 connected to the other end of the liquid diversion pipe group 32 and pre-buried in the filling layer 222, and a sensor assembly 34 for monitoring the interior of the first cover layer 21 and the second cover layer 23;

[0068] The liquid inlet pipe assembly 32 includes a pipe pump assembly 321 connected to the temporary storage tank assembly 31 at one end, a backwash filter device 322 provided on the pipe of the pipe pump assembly 321, and a liquid separation assembly 323 connected to the other end of the pipe pump assembly 321 at one end; the buried pipe 33 is connected to the other end of the liquid separation assembly 323; wherein the buried pipe 33 adopts a commercially available PE perforated drainage pipe;

[0069] like Figure 4 As shown, the tube pump assembly 321 includes a liquid diversion tube 3211 connected to the temporary storage tank assembly 31 at one end and connected to the liquid separation assembly 323 at the other end, and a pump body 3212 that provides water diversion power for the liquid diversion tube 3211;

[0070] The backwash filter device 322 is provided on the liquid inlet pipe 3211;

[0071] The liquid separation assembly 323 includes a liquid separation main tank 3231 connected to the liquid guide tube 3211 , and a plurality of liquid separation branch pipes 3232 , one end of which is connected to the liquid separation main tank 3231 and the other end of which is connected to the buried pipe 33 .

[0072] It should be noted that: this embodiment also includes a PLC control system and a power supply device, and the pump body 3212, the PLC control system and the power supply device are all commercially available products.

[0073] The pollution reduction and carbon reduction method using the pollution reduction and carbon reduction buffer cover system of this embodiment includes:

[0074] S1. Construction of the covering system

[0075] After the garbage in the landfill 1 reaches the designated location, 6 parts of steel slag, 3 parts of municipal sludge, and 0.3 parts of auxiliary material are mixed uniformly by weight to obtain a first mixed base material, which is then adjusted to a moisture content of 8% and laid over the garbage in the landfill 1 to a thickness of 0.5 m, forming a first covering layer 21; wherein the auxiliary material is lime;

[0076] Then the geocell is laid on the first cover layer 21 to form a geocell layer 221;

[0077] Then, 4 parts of steel slag and 8 parts of municipal sludge are mixed evenly by weight, and then filled into the cells of the geocell layer 221. The material is continuously filled until it is 0.05 m above the geocell layer 221. The buried pipe 33 is laid and a joint is reserved. Then, the material is filled again to a total thickness of 0.2 m to form a filling layer 222. The total thickness of the filling layer 222 is equal to the total height of the cell of the geocell layer 221 and the thickness of the filling layer 222 material above the geocell layer 221.

[0078] 4 parts steel slag, 8 parts municipal sludge, and 3 parts auxiliary material are mixed uniformly by weight to obtain a second mixed base material, which is then adjusted to a moisture content of 15% and laid on the filling layer 222 to a thickness of 0.3 m to form a second covering layer 23; wherein the auxiliary material is humus soil;

[0079] Prepare the materials needed for the ecological soil layer 241 and lay them on top of the second cover layer 23. During the laying process, set up a vegetation net 243. Then, plant ecological plants 242 to form the ecological layer 24. The ecological soil layer 241 is local agricultural soil with a thickness of 0.1m. The ecological plants 242 are Bermuda grass.

[0080] Then, the reserved interface is connected to the liquid separation component 323, and the backwash filter device 322, the pipe pump group 321, and the temporary storage tank group 31 are assembled. Then, the temporary storage tank group 31 is connected to the leachate disposal system of the landfill 1;

[0081] Then, a sensor component 34 is arranged inside the first cover layer 21 and the second cover layer 23; wherein the sensor component 34 includes a temperature sensor and a humidity sensor;

[0082] S2. Operation of the covering system

[0083] The leachate tail water treated by the leachate disposal system is recharged to the cover layer group 2 through the recharge system 3, and the first cover layer 21 and the second cover layer 23 are monitored by the sensor component 34; the temperature and humidity of the first cover layer 21 and the second cover layer 23 are specifically monitored; wherein, the total oxidized nitrogen load of the leachate recharge is controlled to be 30gt -1 (TS)d -1 .

[0084] Example 2

[0085] The difference from Example 1 is that:

[0086] In the pollution reduction and carbon reduction method, step S1 is:

[0087] After the garbage in landfill 1 reaches the designated location, 10 parts steel slag, 4 parts municipal sludge, and 0.35 parts auxiliary material are mixed uniformly by weight to obtain a first mixed base material, which is then adjusted to a moisture content of 9% and laid over the garbage in landfill 1 to a thickness of 0.8 m, forming a first covering layer 21; wherein the auxiliary material is lime;

[0088] Then the geocell is laid on the first cover layer 21 to form a geocell layer 221;

[0089] Then, 5 parts of steel slag and 9 parts of municipal sludge are mixed evenly by weight, and then filled into the cells of the geocell layer 221. The material is continuously filled until it is 0.08 m above the geocell layer 221. The buried pipe 33 is laid and a joint is reserved. Then, the material is filled again to a total thickness of 0.25 m to form a filling layer 222. The total thickness of the filling layer 222 is equal to the total height of the cell of the geocell layer 221 and the thickness of the filling layer 222 material above the geocell layer 221.

[0090] 5 parts steel slag, 11 parts municipal sludge, and 6 parts auxiliary material were mixed uniformly by weight to obtain a second mixed base material, which was then adjusted to a moisture content of 16% and laid on the filling layer 222 to a thickness of 0.4 m to form a second covering layer 23; wherein the auxiliary material was humus soil;

[0091] Prepare the materials required for the ecological soil layer 241 and lay them on top of the second cover layer 23. During the laying process, set up a vegetation net 243. Then, plant ecological plants 242 to form the ecological layer 24. The ecological soil layer 241 is local agricultural soil with a thickness of 0.15m. The ecological plants 242 are Bermuda grass.

[0092] Then, the reserved interface is connected to the liquid separation component 323, and the backwash filter device 322, the pipe pump group 321, and the temporary storage tank group 31 are assembled. Then, the temporary storage tank group 31 is connected to the leachate disposal system of the landfill 1;

[0093] Then, a sensor component 34 is arranged inside the first cover layer 21 and the second cover layer 23; wherein the sensor component 34 includes a temperature sensor and a humidity sensor;

[0094] Example 3

[0095] The difference from Example 1 is that:

[0096] In the pollution reduction and carbon reduction method, step S1 is:

[0097] After the garbage in the landfill 1 reaches the designated location, 13 parts of steel slag, 5 parts of municipal sludge, and 0.5 parts of auxiliary material are mixed uniformly by weight to obtain a first mixed base material, which is then adjusted to a moisture content of 10% and laid over the garbage in the landfill 1 to a thickness of 1.0 m, forming a first covering layer 21; wherein the auxiliary material is lime;

[0098] Then the geocell is laid on the first cover layer 21 to form a geocell layer 221;

[0099] Then, 6 parts of steel slag and 12 parts of municipal sludge are mixed evenly by weight, and then filled into the cells of the geocell layer 221. The material is continuously filled until it is 0.1 m above the geocell layer 221. The buried pipe 33 is laid and a joint is reserved. Then, the material is filled again to a total thickness of 0.3 m to form a filling layer 222. The total thickness of the filling layer 222 is equal to the total height of the cells of the geocell layer 221 and the thickness of the filling layer 222 material above the geocell layer 221.

[0100] 6 parts of steel slag, 15 parts of municipal sludge, and 7 parts of auxiliary materials are mixed uniformly by weight to obtain a second mixed base material, which is then adjusted to have a moisture content of 18% and laid on the filling layer 222 to a thickness of 0.5 m to form a second covering layer 23; wherein the auxiliary material is humus soil;

[0101] Prepare the materials needed for the ecological soil layer 241 and lay them on top of the second cover layer 23. During the laying process, set up a vegetation net 243. Then, plant ecological plants 242 to form the ecological layer 24. The ecological soil layer 241 is local agricultural soil with a thickness of 0.2m. The ecological plants 242 are Bermuda grass.

[0102] Then, the reserved interface is connected to the liquid separation component 323, and the backwash filter device 322, the pipe pump group 321, and the temporary storage tank group 31 are assembled. Then, the temporary storage tank group 31 is connected to the leachate disposal system of the landfill 1;

[0103] Then, a sensor component 34 is arranged inside the first cover layer 21 and the second cover layer 23; wherein the sensor component 34 includes a temperature sensor and a humidity sensor;

[0104] Example 4

[0105] Different from Example 1, Figure 5 As shown, the liquid separation component 323 also includes a pressurizing component 3233 for pressurizing the liquid separation main tank 3231.

[0106] During use, pressurizing the main liquid separation tank 3231 using the pressurizing component 3233 can ensure that the leachate in the main liquid separation tank 3231 enters the buried pipe 33 .

[0107] Example 5

[0108] Different from Example 4, Figure 6 As shown, the buried pipe 33 includes a permeation main pipe 331 installed at the other end of the liquid separation component 323, and multiple groups of permeation auxiliary pipe groups 332 respectively connected to the permeation main pipe 331; each group of permeation auxiliary pipe groups 332 includes multiple spaced connecting pipes 333 and multiple permeation pipes 334 correspondingly arranged on two adjacent connecting pipes 333;

[0109] like Figure 7 As shown, the permeation tube 334 includes a permeation tube body 3341 having permeation holes 3340 on its surface and connected to the connecting tube 333, and a sponge column 3342 disposed in the permeation tube body 3341 and having its outer wall in contact with the inner wall of the permeation tube body 3341;

[0110] A through groove 3343 is provided inside the sponge column 3342 .

[0111] During use, the leachate tail water can penetrate into the filling layer 222 through the penetration hole 3340, and the sponge column 3342 can effectively slow down the water flow directly ejected to form a water column with greater impact force, thereby avoiding the problem of the ejected water column causing a large scouring of the filling layer 222 and causing the covering layer group 2 to collapse.

[0112] Example 6

[0113] The difference from Example 5 is that: Figure 8 、 9 As shown, the pollution reduction and carbon reduction buffer cover system also includes an aeration component 4, which includes a first aeration pipe 41 arranged in the garbage in the landfill 1, a second aeration pipe 42 arranged in the filling layer 222, and a fan unit 43 connected to the first aeration pipe 41 and the second aeration pipe 42.

[0114] The first aeration pipe 41 and the second aeration pipe 42 can be used to achieve intermittent aeration and oxygenation of the garbage in the landfill 1; the intermittent time range is 1h, and the aeration and oxygenation volume is 100L; and the circulation of air flow inside the garbage can be promoted by aeration; on the one hand, it can play a cooling role, and the formation of a bioreactor inside the garbage pile will cause the soil temperature in the covering layer group to rise, and excessively high soil temperature will cause the roots of the ecological plants 242 to develop slowly or even die. Therefore, when in use, the temperature and humidity of the first covering layer 21 and the second covering layer 23 are monitored in real time through the sensor component 34. When the temperature of the first covering layer 21 and the second covering layer 23 is higher than 35°C, aeration and ventilation treatment is required; on the other hand, the CO2 gas released from the garbage can be flushed to the covering layer group 2 for adsorption by steel slag, thereby achieving a carbon reduction effect.

Claims

1. A pollution-reducing and carbon-reducing buffer cover system for a landfill, comprising a cover group (2) laid above the landfill (1), and a recharge system (3) for providing recharge fluid to the cover group (2); It is characterized by: The cover layer group (2) comprises a first cover layer (21) laid on the garbage in the landfill (1), an irrigation layer (22) laid on the first cover layer (21), a second cover layer (23) laid on the irrigation layer (22), and an ecological layer (24) laid on the second cover layer (23); The irrigation layer (22) comprises a geocell layer (221) laid on the upper surface of the first covering layer (21), and a filling layer (222) laid above the geocell layer (221) and filled in the cells of the geocell layer (221), wherein the filling layer is not subjected to moisture content adjustment treatment; The first covering layer (21) is prepared by mixing steel slag and municipal sludge as the main matrix materials with lime; the second covering layer (23) is prepared by mixing steel slag and municipal sludge as the main matrix materials with humus soil; the filling layer (222) is prepared by mixing steel slag and municipal sludge, the lime can disinfect and remove odors from the garbage, the steel slag can absorb moisture in the municipal sludge, the steel slag can absorb CO2 gas released from the garbage, and the reinjected leachate tail water can form magnesium ammonium phosphate fertilizer with the steel slag and municipal sludge; The ecological layer (24) includes an ecological soil layer (241) laid above the second covering layer (23), and ecological plants (242) planted in the ecological soil layer (241); a vegetation net (243) is provided in the ecological soil layer (241); The recharge system (3) comprises a temporary storage tank group (31) connected to the leachate disposal system of the landfill (1), a liquid diversion pipe group (32) connected to the temporary storage tank group (31) at one end, a buried pipe (33) connected to the other end of the liquid diversion pipe group (32) and pre-buried in the filling layer (222), and a sensor component (34) for monitoring the interior of the first covering layer (21) and the second covering layer (23); The liquid induction pipe group (32) comprises a pipe pump group (321) connected to the temporary storage tank group (31) at one end, a backwash filter device (322) arranged on the pipeline of the pipe pump group (321), and a liquid separation component (323) connected to the other end of the pipe pump group (321) at one end; the buried pipe (33) is connected to the other end of the liquid separation component (323).

2. The pollution-reducing and carbon-reducing buffer cover system for landfills according to claim 1, characterized in that: The preparation process of the first covering layer (21) is as follows: according to the weight ratio, 6 to 13 parts of steel slag, 3 to 5 parts of municipal sludge, and 0.3 to 0.5 parts of auxiliary materials are mixed evenly to obtain a first mixed base material, and then the water content is adjusted to 8 to 10%, and then the first mixed base material is laid on the garbage in the landfill (1); the auxiliary material is lime.

3. The pollution-reducing and carbon-reducing buffer cover system for landfills according to claim 1, characterized in that: The preparation process of the filling layer (222) is as follows: 4 to 6 parts of steel slag and 8 to 12 parts of municipal sludge are mixed evenly according to weight, and then laid on top of the geocell layer (221) and filled in the grid of the geocell layer (221).

4. The pollution-reducing and carbon-reducing buffer cover system for landfills according to claim 1, characterized in that: The preparation process of the second covering layer (23) is as follows: according to the weight ratio, 4 to 6 parts of steel slag, 8 to 15 parts of municipal sludge, and 3 to 7 parts of auxiliary materials are mixed evenly to obtain a second mixed base material, and then the water content is adjusted to 15 to 18%, and then the second mixed base material is laid on the filling layer (222); the auxiliary material is humus soil.

5. The pollution-reducing and carbon-reducing buffer cover system for landfills according to claim 1, characterized in that: The tube pump assembly (321) comprises a liquid diversion tube (3211) connected at one end to the temporary storage tank assembly (31) and at the other end to the liquid separation assembly (323), and a pump body (3212) providing water diversion power for the liquid diversion tube (3211); The backwash filter device (322) is arranged on the liquid inlet pipe (3211); The liquid separation component (323) comprises a liquid separation main tank (3231) connected to the liquid guide tube (3211), and a plurality of liquid separation branch pipes (3232) each having one end connected to the liquid separation main tank (3231) and the other end connected to the buried pipe (33).

6. The pollution-reducing and carbon-reducing buffer cover system for landfills according to claim 5, characterized in that: The liquid separation component (323) further includes a pressurizing component (3233) for pressurizing the liquid separation main tank (3231).

7. The pollution-reducing and carbon-reducing buffer cover system for landfills according to claim 1, characterized in that: The buried pipe (33) comprises a permeation main pipe (331) installed at the other end of the liquid separation component (323), and a plurality of permeation auxiliary pipe groups (332) respectively connected to the permeation main pipe (331); each group of the permeation auxiliary pipe groups (332) comprises a plurality of spaced connecting pipes (333), and a plurality of permeation pipes (334) arranged on two adjacent connecting pipes (333) in a one-to-one correspondence.

8. The pollution-reducing and carbon-reducing buffer cover system for landfills according to claim 7, characterized in that: The permeation tube (334) comprises a permeation tube body (3341) having permeation holes (3340) on its surface and connected to the connecting tube (333), and a sponge column (3342) disposed within the permeation tube body (3341) and having an outer wall in contact with the inner wall of the permeation tube body (3341). A through groove (3343) is provided inside the sponge column (3342).

9. The pollution-reducing and carbon-reducing buffer cover system for landfills according to claim 1, characterized in that: The invention also includes an aeration assembly (4), wherein the aeration assembly (4) includes a first aeration pipe (41) arranged in the garbage of the landfill (1), a second aeration pipe (42) arranged in the filling layer (222), and a fan unit (43) connected to the first aeration pipe (41) and the second aeration pipe (42).

10. The pollution reduction and carbon reduction method of the pollution reduction and carbon reduction buffer cover system according to any one of claims 1 to 9, characterized in that: include: S1. Construction of the covering system After the garbage in the landfill (1) reaches the designated location, the material required for the first covering layer (21) is prepared and laid on the garbage until the thickness reaches 0.5 to 1.0 m, thereby forming the first covering layer (21); Then, the geocell is laid on the first cover layer (21) to form a geocell layer (221); Then, the material required for the filling layer (222) is prepared and filled into the cells of the geocell layer (221), and the material is continuously filled until it is 0.05-0.1 m above the geocell layer (221), the buried pipe (33) is laid and the interface is reserved, and then the material is filled again to a total thickness of 0.2-0.3 m to form a filling layer (222); wherein the total thickness of the filling layer (222) is equal to the total height of the cell height of the geocell layer (221) and the thickness of the filling layer (222) material above the geocell layer (221); Preparing materials required for the second covering layer (23) and laying the materials on the filling layer (222) until the thickness reaches 0.3-0.5 m, thereby forming the second covering layer (23); Prepare the materials required for the ecological soil layer (241) and lay the materials on top of the second covering layer (23), and set a vegetation net (243) during the laying; then plant ecological plants (242) to form an ecological layer (24); Then, the reserved interface is connected to the liquid separation component (323), and the backwash filter device (322), the pipe pump group (321), and the temporary storage tank group (31) are assembled, and then the temporary storage tank group (31) is connected to the leachate disposal system of the landfill (1); Then, a sensing component (34) is arranged inside the first covering layer (21) and the second covering layer (23); S2. Operation of the covering system The leachate tail water treated by the leachate disposal system is recharged to the cover layer group (2) through the recharge system (3), and the interior of the first cover layer (21) and the second cover layer (23) are monitored using the sensor component (34); the temperature and humidity of the first cover layer (21) and the second cover layer (23) are specifically monitored.

Images