CN109731883B - Landfill gaseous phase pollutant normal position system of cutting down based on insertion layer type functional layer - Google Patents
Landfill gaseous phase pollutant normal position system of cutting down based on insertion layer type functional layer Download PDFInfo
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Abstract
The invention discloses a landfill gas phase pollutant in-situ reduction system based on an intercalation type functional layer, which comprises the steps of arranging the intercalation type functional layer above a landfill body and below a closing cover system of a landfill; the insert layer type functional layer comprises a breathable film layer, a functional packing layer and an HDPE film layer which are sequentially arranged, and an unpowered air automatic exchange system is further arranged in the functional packing layer. Because the mineralized refuse in the functional filler layer has the characteristics of high organic matter content, large microbial quantity, rich sludge carbon pore structure, high nitrogen content of the oxidative ammonolysis straw stalks and the like, and the unpowered air automatic exchange system is arranged to promote the formation of an aerobic environment of microbial activity, the system can effectively reduce the release concentration and release amount of gas-phase pollutants in the refuse landfill. The adsorption and degradation agent is applied to the existing refuse landfill structure, is simple to operate, low in cost and good in adsorption and degradation effect, and has great social benefit and economic benefit.
Description
Technical Field
The invention relates to an in-situ reduction system for gas-phase pollutants in a refuse landfill based on an intercalation type functional layer, in particular to a construction method for the intercalation type functional layer of the refuse landfill and an in-situ reduction method for malodorous gas and methane, and belongs to the technical field of environmental protection.
Background
The release amount of gas phase pollutants such as malodorous gas, methane and the like in the refuse landfill is large, and the in-situ reduction is difficult. The existing landfill closure coverage system consists of HDPE (high-density polyethylene) films and coverage layers above a garbage pile body, has certain effects on the aspects of isolating direct contact of garbage and external environment, providing nutrient soil for planting surface vegetation and the like, but has certain effects on NH (NH)3、H2The active reduction capability of malodorous gases such as S and the like and methane is low.
Compared with the 'system and method for oxidizing methane (CN 102906032A)' patent of Zhaoyuan and Handan, the patent makes full use of the methane oxidation capability of mineralized refuse, introduces outside gas through a pipeline, creates an aerobic environment, and improves the methane oxidation rate of a refuse landfill by adding nutrient solution, thereby providing a suitable landfill methane oxidation method; however, the addition of nutrient solution increases the cost of raw materials, and air is not easy to enter the interior of the garbage pile body only by the natural flow of outside air, and especially the air is exposed on the surface in the implementation process, so that the odor is easily released.
In view of the above, the application proposes that an insert layer type functional layer is constructed below a covering system above a landfill dump body, and malodorous gas and methane are reduced in situ through an unpowered air automatic exchange system distributed on the layer and the physical and chemical adsorption and microbial action of a composite material.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a landfill gaseous pollutant in-situ reduction system based on an inserted functional layer, the functional layer aiming at in-situ reduction of landfill stink, methane and other gaseous pollutants is constructed below a covering layer in the existing landfill structure, mineralized garbage for providing a microorganism inoculation effect, sludge carbon for providing a carrier for microorganisms and rice husk straws for providing nutrients are arranged in the inserted functional layer through the compounding of functional materials, and an automatic ventilation system is arranged, so that the in-situ oxidation reduction of the stink and the methane is facilitated.
The invention takes mineralized refuse, sludge carbon and straw stalks as basic materials, and an insertion layer type functional layer is inserted between a landfill closure covering system and a refuse dump body, a non-woven fabric breathable film is laid under the layer, an HDPE film is laid on the layer, and after a transverse perforated pipe, a vertical air supply system and an air cap are laid in the layer, the in-situ reduction is carried out on gas-phase pollutants such as malodor, methane and the like, thereby effectively improving the defect that the gas-phase pollutants in the existing landfill are difficult to remove. The mixed covering material composed of the components has the characteristics of high content of organic matters in the mineralized refuse, high microbial quantity, rich sludge carbon pore structure, high nitrogen content of the rice straw after oxidative ammonolysis and the like4Iso greenhouse gas and NH3、H2S and other malodorous gases have good adsorption and degradation effects; the installation of the unpowered air automatic exchange system can promote the formation of an aerobic environment which is beneficial to the activity of microorganisms, and the unpowered air automatic exchange system is simple to operate, low in cost and long in service life.
The purpose of the invention is realized by the following technical scheme:
the invention provides an insert type functional layer, which comprises a breathable film layer, a functional packing layer and an HDPE film layer which are sequentially arranged, wherein the functional packing layer is also internally provided with an unpowered air automatic exchange system.
Preferably, the material of the functional filler layer comprises 6-8 mass ratio: 2-4: 1-3 of mineralized refuse, sewage peat and straw stalks;
the thickness of the functional filler layer is 30-100cm, and the porosity is 0.5-0.9g/cm3The particle size range is 5-20mm, the gas velocity is 0.01-0.05m/s, the ORP is-100 mV, and the specific surface area is 50-250m2The organic matter content is 40-50g/kg, the cation exchange capacity is 80-100cmol/kg, and the pH value is alkaline.
Preferably, the peat is domesticated sludge carbon; the preparation method comprises the following steps:
a1, obtaining the sludge through anaerobic or anoxic pyrolysis process under the anaerobic or anoxic state of 250-650 ℃; the specific surface area of the sewage peat is 50-300m2(iv)/g, particle size 5-20 mm;
a2, burying the sludge carbon obtained in the step A1 in mineralized garbage for in-situ domestication culture, wherein the burying depth is 30-150cm, and the culture time is 2-6 months, so as to obtain the domesticated sludge carbon, the total number of bacteria on the surface of the domesticated sludge carbon reaches 1 multiplied by 106-5×107Per 100 g.
Preferably, the mineralized waste is stable or semi-stable waste screening fine materials obtained after 8 years or more of landfill; the organic matter content of the mineralized refuse is 80-120g/kg, and the total number of bacteria reaches 1 multiplied by 106-1×107Particle/g, particle size < 20 mm.
Preferably, the rice straw is treated by oxidative ammonolysis;
the processing steps are as follows:
the straw stalk is obtained by carrying out oxidative ammonolysis treatment on the straw stalk through hydrogen peroxide and ammonia water, and the total nitrogen mass fraction of the treated straw stalk is 3-5%, and the mass fraction of the fulvic acid is 0.3-0.6%.
Preferably, the preparation method of the functional filler layer is as follows: and uniformly mixing the sewage peat, the mineralized refuse and the straw stalks according to a mass ratio, and then forming to obtain the straw-based organic fertilizer.
Preferably, the unpowered air automatic exchange system comprises a perforated air guide pipe and a plurality of vertical air guide pipes, wherein the perforated air guide pipes are transversely arranged in the functional packing layer, and the vertical air guide pipes are vertically arranged on the perforated air guide pipes; the other end of the vertical air duct penetrates through the HDPE film and extends to the outside, and a hood is arranged at the extending end of the vertical air duct;
the wall of the perforated air duct is uniformly provided with a plurality of small holes, the aperture of each small hole is 5-10mm, so that air enters the functional packing layer to form an aerobic environment which is beneficial to the activity of microorganisms.
Preferably, the pipe diameter of the perforated gas-guide pipe is 20-80mm, the perforated gas-guide pipes are arranged in parallel, the distance between the perforated gas-guide pipes is 20-40m, and two ends of the perforated gas-guide pipe are communicated with the atmosphere; the pipe diameter of the vertical air guide pipe is 20-80mm, and the space between the vertical air guide pipes on each perforated air guide pipe is 20-40 m; the radius of the blast cap is 25-40cm, and the service radius of the blast cap is 30-50 m.
The invention also provides a landfill gas phase pollutant in-situ reduction system based on the intercalation type functional layer, which comprises the intercalation type functional layer arranged above a landfill body and below a sealing covering system of the landfill.
Preferably, the hood is disposed above the seal cover system.
The invention is formed by mixing the mineralized refuse, the sewage peat and the straw stalks which are treated by oxidation ammonolysis according to a certain mass ratio, and can achieve good reduction effect. The mineralized refuse fine material has higher fertility and larger specific surface area, and a large number and a large variety of microorganisms are stored in the mineralized refuse fine material, so that the mineralized refuse fine material is a biological medium with excellent performance; the sewage peat is rich in pore structure and can be used as a good microbial carrier; the rice straw subjected to oxidative ammonolysis treatment has high total nitrogen and fulvic acid content, has high fertility, and can provide sufficient nutrients for the growth activities of microorganisms. And air is introduced below the covering layer, so that the activity of aerobic microorganisms in the insert type functional layer can be accelerated, and the biodegradation rate of malodorous gas and methane can be effectively improved.
The work principle of the landfill gas phase pollutant in-situ reduction system based on the intercalation type functional layer is as follows: when malodorous gas and methane generated by a garbage pile body of a garbage landfill are dissipated to the insertion layer type functional layer, air is introduced by the unpowered air automatic exchange system (the air enters from two ends of the perforated air guide pipe and then flows to the hood through the vertical air guide pipe to accelerate and convert the parallel-direction air flow above the sealing covering system into vertical air flow from bottom to top), and the malodorous gas and the methane are degraded and converted in situ through the physical-chemical adsorption and the microbial action of the functional filler layer in the insertion layer type functional layer, so that the release amount of gas-phase pollutants is reduced.
Compared with the prior art, the invention has the following beneficial effects:
(1) the mineralized refuse is utilized as a covering material on site, which is beneficial to releasing the capacity of a landfill reservoir; meanwhile, the sludge-to-charcoal and the oxidative ammonolysis of the straw provide good reduction for the municipal sludge and the field straw which are difficult to treat, and the effect of treating wastes with processes of wastes against one another is achieved. Meanwhile, the mineralized waste has excellent physicochemical property and is rich in microorganisms; the sewage peat can be used as a good microorganism carrier due to the larger specific surface area and porosity; the straw stalk after the oxidative ammonolysis has higher nitrogen content, and the three are mixed in proportion, so that the degradation effect of various microorganisms on corresponding gases can be exerted while the malodorous gases and methane are subjected to physical and chemical adsorption, and the release amount of gas-phase pollutants is effectively reduced.
(2) An adsorption function layer compounded by mineralized garbage, sewage peat and straw stalks is inserted below a traditional refuse landfill covering system, and a non-woven fabric breathable film laid under the layer can separate a refuse pile body from a function filler layer, so that infiltration of leachate is reduced; the HDPE film laid on the functional filler layer can further block the dissipation of gas-phase pollutants. The insertion type functional layer is used for carrying out in-situ reduction on the malodor and the methane, so that a better source reduction effect can be achieved, and the release amount of gas-phase pollutants is effectively reduced.
(3) An unpowered air automatic exchange system is arranged in the interlayer type functional layer, so that ventilation of the functional layer below the HDPE film can be enhanced, a quasi-aerobic environment is provided for microbial activity, and the degradation rate of aerobic microorganisms to methane and malodorous gas is improved. The top end of the vertical air duct is provided with the blast cap, so that the system can realize free flow of air without depending on the temperature difference between the inside and the outside of the garbage pile body. The whole process is simple to operate and low in cost, the hood can be operated for a long time without being electrified, and meanwhile, the hood is anticorrosive, explosion-proof and alkali-resistant, and can effectively realize ventilation of the inserted functional layer.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic sectional structure view of a gas phase pollutant in-situ abatement system for a landfill site based on an intercalation-type functional layer constructed according to the present invention;
FIG. 2 is a schematic top view of a functional layer inserted-based in-situ abatement system for gaseous pollutants in a landfill site constructed in accordance with the present invention;
wherein: 1-an HDPE film layer; 2-a functional filler layer; 3-a non-woven breathable film layer; 4-perforated gas-guide tube; 5-vertical gas-guide tube; 6-blast cap; 7-garbage dump; 8-seal cover system.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1 construction of a novel landfill intercalation functional layer in-situ deodorization System
An in-situ reduction system for gas-phase pollutants in a refuse landfill is shown in fig. 1 and 2, and comprises an insertion type functional layer arranged above a refuse dump 7 and below a closing cover system 8 of the refuse landfill. The insert layer type functional layer comprises a non-woven fabric breathable film layer 3, a functional packing layer 2 and an HDPE film layer 1 which are sequentially arranged, and an unpowered air automatic exchange system is further arranged in the functional packing layer 2.
Preparing the functional filler layer 2: firstly, the garbage from old harbor garbage landfill site is taken for about 8-12 years of landfill and is subjected to large-scale treatmentThe particle size is less than 20mm after screening, the organic matter content is 80-120g/kg, and the total number of bacteria is 1 multiplied by 106-1×107Per gram of mineralized refuse; the sludge carbon is directly fired by excess sludge from a sewage plant at 500 ℃ under an anaerobic condition; then burying the burnt sludge carbon into a mineralized refuse bed for in-situ acclimation culture, wherein the landfill depth is 30-150cm, and the culture time is 2-6 months, so that the total number of bacteria on the surface of the sludge carbon reaches 1 multiplied by 106-5×107Obtaining domesticated peat per 100 g; every 5g of straw stalk is oxidized and ammonolyzed for 90min by 25mL of hydrogen peroxide and 15mL of ammonia water to obtain the oxidized and ammonolyzed straw stalk, wherein the total nitrogen mass fraction of the oxidized and ammonolyzed straw stalk is 3-5%, and the mass fraction of the fulvic acid is 0.3-0.6%. Mixing mineralized garbage, domesticated sewage peat and straw stalks subjected to oxidative ammonolysis according to the weight ratio of 6: 2: 1, the organic matter content in the functional filler layer is 48g/kg, the cation exchange capacity is 86cmol/kg, and the porosity is 0.7g/cm3Specific surface area 120m2(iv) g, particle size range of 5-20mm, ORP of-86 mV, pH of alkaline. The thickness was 40 cm. The unpowered air automatic exchange system comprises a perforated air duct 4 and a plurality of vertical air ducts 5, wherein the perforated air duct 4 is transversely arranged, the vertical air ducts 5 are perpendicular to the perforated air duct 4, the perforated air duct 4 is transversely arranged in the functional packing layer 2, and the vertical air ducts 5 are vertically arranged on the perforated air duct 4; the other end of the vertical air duct 5 passes through the HDPE film 1 and extends to the outside above the sealing covering system 8, and the extending end of the vertical air duct 5 is provided with a hood 6. The wall of the perforated air duct 4 is uniformly provided with a plurality of small holes, and the aperture of each small hole is 5-10 mm.
A perforated air guide pipe 4 with the pipe diameter of 50mm is laid in the interlayer type functional layer at intervals of 25m in parallel, a fine-hole gauze filled with gravels is wrapped outside the perforated air guide pipe 4, and two ends of the perforated air guide pipe 4 are communicated with the atmosphere.
Vertical air ducts 5 with the pipe diameter of 50mm are communicated with the perforated air duct 4 every 30m, each vertical air duct 5 is 70cm long, an unpowered hood 6 is installed at the top end of each vertical air duct 5, the radius of each hood 6 is 25cm, and the service radius of each hood is 30-50 m.
By NH3、H2S、CH4The release concentrations were the subjects of investigation and a comparison of the three gas release concentrations was determined between a conventional landfill cover system (comprising a non-woven gas permeable layer and an HDPE film layer) and a landfill cover system based on an intercalated functional layer as described in this example. NH (NH)3The determination of (A) was performed by sodium hypochlorite-salicylic acid spectrophotometry (HJ 534-2009), H2The determination of S was carried out by methylene blue spectrophotometry (GB 11742-89), CH4The determination of (2) was carried out by gas chromatography. When NH is present3The inlet air concentration of (A) is 3.0-5.0mg/m3,H2The inlet gas concentration of S is 1.0-2.0mg/m3,CH4When the intake concentration is 10-20%, the system runs for 2 weeks, and the test result shows that the coverage system adopting the insertion type functional layer has NH (NH) of the traditional coverage system3、H2S、CH4The released concentrations of the three gases were reduced by 80.5%, 74.3% and 75.2%, respectively.
Embodiment 2, construction of novel landfill intercalation functional layer in-situ deodorization system
An in-situ reduction system for gas-phase pollutants in a refuse landfill comprises an insertion type functional layer arranged above a refuse dump body of the refuse landfill and below a closing covering system. The insert layer type functional layer comprises a non-woven fabric breathable film layer, a functional packing layer and an HDPE film layer which are sequentially arranged, and an unpowered air automatic exchange system is further arranged in the functional packing layer.
The preparation of the functional filler layer comprises the following steps: firstly, the refuse from old harbor refuse landfill site for about 8-12 years is taken, after roughly screening, the particle size is less than 20mm, the organic matter content is 80-120g/kg, and the total number of bacteria reaches 1 multiplied by 106-1×107Per gram of mineralized refuse; the sludge carbon is directly fired by excess sludge from a sewage plant at 400 ℃ under an anaerobic condition; then burying the burnt sludge carbon into a mineralized refuse bed for in-situ acclimation culture, wherein the landfill depth is 30-150cm, and the culture time is 2-6 months, so that the total number of bacteria on the surface of the sludge carbon reaches 1 multiplied by 106-5×107Obtaining domesticated peat per 100 g; performing oxidative ammonolysis on every 5g of straw stalk by using 20mL of hydrogen peroxide and 10mL of ammonia water for 120min to obtain the oxidative ammonolysis straw stalk, wherein the total nitrogen mass fraction of the oxidative ammonolysis straw stalk is 3-5 percentThe mass fraction of the fulvic acid is 0.3-0.6%. Mixing mineralized garbage, domesticated sewage peat and straw stalks subjected to oxidative ammonolysis according to the weight ratio of 7: 3: 2, the organic matter content of the functional filler layer is 50g/kg, the cation exchange capacity is 80cmol/kg, and the porosity is 0.8g/cm3Specific surface area of 160m2(ii)/g, particle size range is 5-20mm, ORP is 11mV, and pH is alkaline. The thickness was 50 cm. The unpowered air automatic exchange system comprises a perforated air guide pipe and a plurality of vertical air guide pipes, wherein the perforated air guide pipes are transversely arranged, the vertical air guide pipes are perpendicular to the perforated air guide pipes, the perforated air guide pipes are transversely arranged in the functional packing layer, and the vertical air guide pipes are vertically arranged on the perforated air guide pipes; the other end of the vertical air duct penetrates through the HDPE film and extends to the outside above the sealing covering system, and the extending end of the vertical air duct is provided with a hood. The wall of the perforated air duct is uniformly provided with a plurality of small holes, and the aperture of each small hole is 5-10 mm.
A perforated air guide pipe with the pipe diameter of 60mm is laid in the interlayer type functional layer at intervals of 30m in parallel, a fine-hole gauze filled with gravels is wrapped outside the perforated air guide pipe, and two ends of the perforated air guide pipe are communicated with the atmosphere.
Vertical air ducts with the pipe diameter of 60mm are communicated with the perforated air duct every 30m, each vertical air duct is 75cm long, an unpowered hood is installed at the top end of each vertical air duct, the radius of the hood is 30cm, and the service radius of the hood is 30-50 m.
By NH3、H2S、CH4The release concentrations were the subjects of investigation and a comparison was determined between the three gas release concentrations measured for a conventional landfill cover system (comprising a non-woven gas permeable layer and an HDPE film layer) and a landfill cover system based on an intercalated functional layer as described in this example. NH (NH)3The determination of (A) was performed by sodium hypochlorite-salicylic acid spectrophotometry (HJ 534-2009), H2The determination of S was carried out by methylene blue spectrophotometry (GB 11742-89), CH4The determination of (2) was carried out by gas chromatography. When NH is present3The inlet gas concentration of (A) is 2.2-4.5mg/m3,H2The inlet gas concentration of S is 2.5-3.8mg/m3,CH4When the intake concentration of the air is 15-30%, the system operatesThe test results show that the cover system using the insert-type functional layer has NH after 30 days compared with the conventional cover system3、H2S、CH4The released concentrations of the three gases were reduced by 84.3%, 80.1% and 76.2%, respectively.
An in-situ reduction system for gas-phase pollutants in a refuse landfill comprises an insertion type functional layer arranged above a refuse dump body of the refuse landfill and below a closing covering system. The insert layer type functional layer comprises a non-woven fabric breathable film layer, a functional packing layer and an HDPE film layer which are sequentially arranged, and an unpowered air automatic exchange system is further arranged in the functional packing layer.
The preparation of the functional filler layer comprises the following steps: firstly, the refuse from old harbor refuse landfill site for about 8-12 years is taken, after roughly screening, the particle size is less than 20mm, the organic matter content is 80-120g/kg, and the total number of bacteria reaches 1 multiplied by 106-1×107Per gram of mineralized refuse; the sludge carbon is directly fired by excess sludge from a sewage plant at 300 ℃ under an anaerobic condition; then burying the burnt sludge carbon into a mineralized refuse bed for in-situ acclimation culture, wherein the landfill depth is 30-150cm, and the culture time is 2-6 months, so that the total number of bacteria on the surface of the sludge carbon reaches 1 multiplied by 106-5×107Obtaining domesticated peat per 100 g; every 5g of straw stalk is oxidized and ammonolyzed for 150min by 15mL of hydrogen peroxide and 25mL of ammonia water to obtain the oxidized and ammonolyzed straw stalk, wherein the total nitrogen mass fraction of the oxidized and ammonolyzed straw stalk is 3-5%, and the mass fraction of the fulvic acid is 0.3-0.6%. Mixing mineralized garbage, sludge carbon and straw stalks in a proportion of 8: 4: 3, the organic matter content of the material is 46g/kg, the cation exchange capacity is 85cmol/kg, and the porosity is 0.6g/cm3Specific surface area of 135m2(iv) g, particle size range of 5-20mm, ORP of 23mV, pH of alkaline. The thickness was 50 cm.
The unpowered air automatic exchange system comprises a perforated air guide pipe and a plurality of vertical air guide pipes, wherein the perforated air guide pipes are transversely arranged, the vertical air guide pipes are perpendicular to the perforated air guide pipes, the perforated air guide pipes are transversely arranged in the functional packing layer, and the vertical air guide pipes are vertically arranged on the perforated air guide pipes; the other end of the vertical air duct penetrates through the HDPE film and extends to the outside above the sealing covering system, and the extending end of the vertical air duct is provided with a hood. The wall of the perforated air duct is uniformly provided with a plurality of small holes, and the aperture of each small hole is 5-10 mm.
A perforated air guide pipe with the pipe diameter of 50mm is laid in the interlayer type functional layer at intervals of 35m in parallel, a fine-hole gauze filled with gravels is wrapped outside the perforated air guide pipe, and two ends of the perforated air guide pipe are communicated with the atmosphere.
Vertical air ducts with the pipe diameter of 50mm are communicated with the perforated air duct every 35m, each vertical air duct is 80cm long, an unpowered hood is installed at the top end of each vertical air duct, the radius of each hood is 35cm, and the service radius of each hood is 30-50 m.
By NH3、H2S、CH4The release concentrations were the subjects of investigation and a comparison was determined between the three gas release concentrations measured for a conventional landfill cover system (comprising a non-woven gas permeable layer and an HDPE film layer) and a landfill cover system based on an intercalated functional layer as described in this example. NH (NH)3The determination of (A) was performed by sodium hypochlorite-salicylic acid spectrophotometry (HJ 534-2009), H2The determination of S was carried out by methylene blue spectrophotometry (GB 11742-89), CH4The determination of (2) was carried out by gas chromatography. When NH is present3The inlet gas concentration of (A) is 3.2-4.6mg/m3,H2The intake air concentration of S is 1.5-2.7mg/m3,CH4When the intake concentration is 20-25%, the system runs for 60 days, and the inserted layer type functional layer covering system is adopted to cover NH compared with the traditional covering system3、H2S、CH4The released concentrations of the three gases were reduced by 88.4%, 90.3% and 82.0%, respectively.
Comparative example 1
This comparative example provides an in situ abatement system for gas phase contaminants in a landfill, substantially the same as the system of example 1, with the only difference being: in the preparation of the functional filler layer of the comparative example, the sludge carbon is not subjected to in-situ acclimation culture. Namely, the sludge carbon which is not acclimatized is adopted.
By NH3、H2S、CH4Release concentration is a study pairLike this, the in-situ abatement system of comparative example 1 was used to determine the three gas evolution concentrations, in the same manner as in example 1. The test results show that the NH of the in-situ abatement system of example 1 compared to the in-situ abatement system of the present comparative example3、H2S、CH4The release concentrations of the three gases are respectively reduced by 42.3 percent, 56.8 percent and 37.1 percent.
Comparative example 2
This comparative example provides an in situ abatement system for gas phase contaminants in a landfill, substantially the same as the system of example 1, with the only difference being: in the preparation of the functional filler layer of the comparative example, the straw stalk is not subjected to oxidative ammonolysis treatment. Namely, the straw stalk which is not subjected to oxidative ammonolysis is adopted.
By NH3、H2S、CH4The concentrations of released gases were investigated and the concentrations of three gases released were determined using the in situ abatement system of this comparative example 1, in the same manner as in example 1. The test results show that the NH of the in-situ abatement system of example 1 compared to the in-situ abatement system of the present comparative example3、H2S、CH4The release concentrations of the three gases are respectively reduced by 22.3 percent, 24.8 percent and 17.4 percent.
Comparative example 3
This comparative example provides an in situ abatement system for gas phase contaminants in a landfill, substantially the same as the system of example 1, with the only difference being: in the preparation of the functional filler layer of the comparative example, the adopted mineralized refuse has a particle size less than 50 mm.
By NH3、H2S、CH4The concentrations of released gases were investigated and the concentrations of three gases released were determined using the in situ abatement system of this comparative example 1, in the same manner as in example 1. The test results show that the NH of the in-situ abatement system of example 1 compared to the in-situ abatement system of the present comparative example3、H2S、CH4The release concentrations of the three gases are respectively reduced by 53.2%, 52.9% and 47.1%.
Comparative example 4
This comparative example provides an in situ abatement system for gas phase contaminants in a landfill, substantially the same as the system of example 1, with the only difference being: in the preparation of the functional filler layer of the comparative example, the mass ratio of the adopted mineralized refuse, the sewage peat and the straw stalks is 6: 1: 2.
by NH3、H2S、CH4The concentrations of released gases were investigated and the concentrations of three gases released were determined using the in situ abatement system of this comparative example 1, in the same manner as in example 1. The test results show that the NH of the in-situ abatement system of example 1 compared to the in-situ abatement system of the present comparative example3、H2S、CH4The release concentrations of the three gases are respectively reduced by 35.4%, 37.2% and 42.0%.
Comparative example 5
This comparative example provides an in situ abatement system for gas phase contaminants in a landfill, substantially the same as the system of example 1, with the only difference being: in the preparation of the functional filler layer of the comparative example, the mass ratio of the adopted mineralized refuse, the sewage peat and the straw stalks is 5: 2: 2.
by NH3、H2S、CH4The concentrations of released gases were investigated and the concentrations of three gases released were determined using the in situ abatement system of this comparative example 1, in the same manner as in example 1. The test results show that the NH of the in-situ abatement system of example 1 compared to the in-situ abatement system of the present comparative example3、H2S、CH4The release concentrations of the three gases are respectively reduced by 31.6%, 28.7% and 28.1%.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (7)
1. An insertion type functional layer is characterized by comprising a breathable film layer, a functional packing layer and an HDPE film layer which are sequentially arranged, wherein the functional packing layer is also internally provided with an unpowered air automatic exchange system;
the functional filler layer is prepared from the following materials in mass ratio of 6-8: 2-4: 1-3 of mineralized refuse, sewage peat and straw stalks; the peat is domesticated sludge carbon; the rice straw is subjected to oxidative ammonolysis treatment;
the preparation steps of the peat are as follows:
a1, obtaining the sludge through anaerobic or anoxic pyrolysis process under the anaerobic or anoxic state of 250-650 ℃; the specific surface area of the sewage peat is 50-300m2(iv)/g, particle size 5-20 mm;
a2, burying the sludge carbon obtained in the step A1 in mineralized garbage for in-situ domestication culture, wherein the burying depth is 30-150cm, and the culture time is 2-6 months, so as to obtain the domesticated sludge carbon, the total number of bacteria on the surface of the domesticated sludge carbon reaches 1 multiplied by 106-5×107Per 100 g;
the mineralized refuse is stable or semi-stable refuse screening fine material obtained after 8 years or more of landfill; the organic matter content of the mineralized refuse is 80-120g/kg, and the total number of bacteria reaches 1 multiplied by 106-1×107Particle/g, particle size < 20 mm.
2. The interlayer type functional layer as claimed in claim 1, wherein the thickness of the functional filler layer is 30-100cm, the particle size range is 5-20mm, the ORP is-100 and 100mV, and the specific surface area is 50-250m2The organic matter content is 40-50g/kg, the cation exchange capacity is 80-100cmol/kg, and the pH value is alkaline.
3. The interposed functional layer according to claim 1, wherein the oxidative ammonolysis treated straw stalks are treated as follows:
the straw stalk is obtained by carrying out oxidative ammonolysis treatment on the straw stalk through hydrogen peroxide and ammonia water, and the total nitrogen mass fraction of the treated straw stalk is 3-5%, and the mass fraction of the fulvic acid is 0.3-0.6%.
4. The interposed functional layer of claim 1, wherein the functional filler layer is prepared by the following method: and uniformly mixing the sewage peat, the mineralized refuse and the straw stalks according to a mass ratio, and then forming to obtain the straw-based organic fertilizer.
5. The interposed functional layer according to claim 1, wherein the unpowered air automatic exchange system comprises a perforated air duct arranged laterally and a plurality of vertical air ducts perpendicular to the perforated air duct, the perforated air duct being arranged laterally in the functional filler layer and the vertical air ducts being arranged vertically on the perforated air duct; the other end of the vertical air duct penetrates through the HDPE film and extends to the outside, and a hood is arranged at the extending end of the vertical air duct;
the wall of the perforated air duct is uniformly provided with a plurality of small holes, and the aperture of each small hole is 5-10 mm.
6. The insert-type functional layer according to claim 5, wherein the perforated gas-guide tubes have a tube diameter of 20-80mm, are arranged in parallel, are spaced at intervals of 20-40m, and are communicated with the atmosphere at two ends; the pipe diameter of the vertical air guide pipe is 20-80mm, and the space between the vertical air guide pipes on each perforated air guide pipe is 20-40 m; the radius of the blast cap is 25-40 cm.
7. An in-situ landfill gas phase pollutant abatement system based on the intercalated functional layer of claim 1, comprising disposing the intercalated functional layer above a landfill body and below a closure cover system of the landfill.
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