CN114319455B - Full-coverage sealing field, environment treatment and re-greening process for large refuse landfill - Google Patents
Full-coverage sealing field, environment treatment and re-greening process for large refuse landfill Download PDFInfo
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- CN114319455B CN114319455B CN202111426472.XA CN202111426472A CN114319455B CN 114319455 B CN114319455 B CN 114319455B CN 202111426472 A CN202111426472 A CN 202111426472A CN 114319455 B CN114319455 B CN 114319455B
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Abstract
The invention discloses a full-coverage sealing field, environment treatment and greening process of a large-scale landfill, which adopts comprehensive treatment, and comprises the steps of spreading out irregular mountain bodies one by one, leveling, compacting, earthing, covering geomembranes, installing leachate treatment equipment and waste gas guide and discharge torch, carrying out environment treatment, greening and ground seepage prevention, comprehensively treating the landfill, realizing ecological greening by scientific construction, good seepage prevention effect, scientific and recoverable discharge and treatment method of three wastes of garbage, and beautifying the environment.
Description
Technical Field
The invention belongs to the field of landfill, and particularly relates to a full-coverage sealing field, environment treatment and greening process of a large-scale landfill.
Background
The landfill is a place where the garbage is finally filled or piled up, the garbage amount is greatly increased in the aspect of the production of people in recent decades, the original large-sized landfill which can be used for 50 years is stored for 30 years, according to field investigation, about 80% of domestic garbage landfills in China belong to simple landfills, garbage piles and sewage cross flow are generated, malodor is fumigated, particularly, some cities are treated, the originally planned landfill is too close to the cities, the landfill becomes a tumor of the cities along with the extension of the cities, the edge of the cities at the four seasons is not too far away from the center of the cities, the malodor is scattered along with wind, residents nearby the cities are not connected with windows all the year round, many efforts are made in the aspect of the situation, the special deodorizing effect of the cities is not good, if the sealing field investment is huge, materials such as geotechnical composite materials, cobble materials, sand stone, clay and the like are difficult to obtain, the transportation cost is high, and the difficult scientific emission and environmental repair of the three wastes are difficult to overcome.
Disclosure of Invention
In order to solve the problems, the invention discloses a full-coverage sealing field, environment treatment and re-greening process of a large-scale landfill, which has scientific construction, good seepage prevention effect, scientific and recyclable method for discharging and treating three wastes of garbage, can realize ecological re-greening, protects the environment and beautifies the environment.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a full-coverage sealing, environmental treatment and greening process for a large-scale refuse landfill comprises the following steps of
1. Pile shaping (moving rubbish mountain to construction site)
Measuring the garbage amount of an original garbage stack body, verifying the garbage amount in a drawing, and drawing a garbage stack body amount balance diagram;
step (2) compiling a detailed garbage stack body dumping scheme according to the excavation area and the filling area in the drawn garbage stack body square quantity balance diagram;
step (3), working areas are divided according to a shipping scheme, and construction machinery enters the field to construct:
a. the garbage in the area of the road of the circular field is dumped to the place to be filled, and the mountain-rind stone is replaced for 1.5m to the replacement height after the garbage is squeezed to be silted;
b. constructing the mountain-turning road according to the road standard of the surrounding field, and repairing a construction channel for dumping garbage;
c. after the garbage in the excavated area is dumped to the filling area, layering and rolling are carried out until the compactness required by design is reached;
d. shaping the garbage pile body while digging and filling, and spraying deodorant for deodorizing with as little disturbance to the original garbage pile body as possible;
e. in construction, smoke and fire are strictly controlled, the concentration of combustible gases such as methane, marsh gas and the like is always in a dangerous value during the shaping of a pile body, a fireproof cap is installed on all construction vehicles, the smoke and fire are strictly forbidden by constructors, and a movable toxic and harmful gas monitor monitors in real time;
2. sealing field
After the pile body shaping in the step (4) is finished, drilling a gas guide well and a leachate lifting well on a new garbage mountain body in a rotary digging mode:
a. the drilling hole diameter of the gas guide well is 1.0m, the gas guide well is wrapped with geotechnical cloth by using DN200HDPE drilling flower pipes, reinforcement cages with the diameter of 1m are drilled in the holes, and gravel with the grain diameter of 50mm is filled between the flower pipes and the reinforcement cages;
b. the drilling aperture of the leachate lifting well is 1.2m, the leachate lifting well adopts a DN600HDPE drilling flower pipe, the bottom of the leachate lifting well is a solid wall pipe with the length of 1.5m, the pipe is filled with middle coarse sand with the thickness of 500mm, the pipe wall wraps a single-sided geotechnical composite drainage net, the diameter of the steel reinforcement cage with the diameter of 1.2m is arranged in the drilling hole, and gravel with the particle size of 80mm is filled between the flower pipe and the steel reinforcement cage;
covering the mountain for the first time after the drilling is finished, covering a layer of the 6 mm-thick geotechnical composite drainage network, and connecting seams in a sewing mode;
step (6), making an air guide branch pipe and an air guide main pipe on the geotechnical composite drainage net, and leaving the air guide main pipe at one side of the to-be-built incineration torch;
step (7), covering clay with the thickness of 300mm, and compacting;
step (8) covering a high-density polyethylene geomembrane with double rough surfaces of 1.5mm thickness, wherein the geomembrane is welded by adopting double-weld hot air welding;
step (9) covering a second layer of 6 mm-thick geotechnical composite drainage net;
step (10), paving a leachate drainage pipeline and a greening pipeline on the mountain;
step (11), covering the mountain with planting soil with the thickness of 800mm, and planting green plants on the planting soil;
step (12) construction of a road structure layer of a surrounding field road and a mountain-like road;
step (13) installing prefabricated transverse and longitudinal concrete drainage ditches and mountain foot ring field drainage ditches on the mountain body;
3. treatment of three wastes
And (4) waste gas treatment: waste gas in the mountain is pumped out through air suction and is conveyed to an incineration torch along the air guide main pipe for incineration, heat of the waste gas is recycled, and whether the gas emission after the incineration meets the environmental protection standard is monitored;
and (3) wastewater discharge: pumping out the percolate in the mountain, and adopting an MBR (A/O+external) +NF system treatment process to ensure that the effluent quality reaches the standard;
the soil below the original garbage field is restored in the step (16): adopting a solidification/stabilization technology and a thermal desorption technology to treat heavy metals and organic matters in soil, wherein a detection result meets the regulations; the site after soil remediation can be used as a living site and a commercial site;
4. vertical impermeable treatment
Piling along the periphery of the mountain body built in the step (13), wherein the depth extends to the weathered rock layer;
digging grooves of the underground continuous wall, wherein the depth of the grooves extends to 2m below the weathered rock layer;
step (19), arranging probes outside the grooves;
and (20) pouring cement-bentonite into the grooves.
As an improvement of the invention, the garbage in the step (3) is dumped to the position to be filled, the roller is adopted for squeezing siltation, the surface of the roller wheel is provided with a sharp convex block (claw roller), the claw roller can effectively crush plastic bags in the garbage, and redundant air is squeezed out, so that the compactness is improved.
As an improvement of the invention, all constructors need to carry a gas mask in the construction process of the step (3).
As an improvement of the invention, the MBR (A/O+external) +NF system in the step (15) comprises an adjusting tank, a filter, a first anaerobic tank, a first denitrification tower, a second anaerobic tank, a second denitrification tower, a cooling tower, an ultrafiltration membrane device, a nanofiltration membrane device, a reverse osmosis membrane device and a monitoring device which are connected in sequence.
As an improvement of the invention, the solidifying/stabilizing technology in the step (15) is to dig polluted soil to crush and stir, add a determined amount of water and medicament into the stirrer, stir and then transport to clean soil for covering and curing, so that the heavy metal pollution of the soil can be removed. Checking and accepting according to the sulfuric acid method of HJ/T299-2007 solid waste leaching toxicity leaching method, wherein the heavy metal leaching concentration is lower than the quality index limit value of the underground water class III, namely the qualified soil is used as a roadbed material and applied to roadbed construction.
As an improvement of the invention, the thermal desorption technology in the step (15) is that after the contaminated soil is excavated, crushing and screening are carried out, the size is smaller than 5cm, the contaminated soil enters a temporary storage area for temporary storage, the contaminated soil is mixed with the treated clean soil, and the contaminated soil enters an alloy rotary dryer after the water content is regulated to be smaller than 25%; the treated soil is backfilled after being cooled by a humidifier or is used as a soil moisture conditioner to be mixed with the polluted soil, and the organic matter pollution in the treated soil can be effectively treated.
As an improvement of the invention, the cement-bentonite in the step (20) is prepared from the following raw materials in parts by weight: 100 parts of water, 30-40 parts of cement, 60-70 parts of bentonite, 0.6-0.8 part of sodium carbonate, 0.1-0.2 part of retarder and 0.1-0.2 part of preservative.
As an improvement of the invention, guide walls are arranged above the two side walls of the groove in the step (18).
As an improvement of the invention, the groove in the step (18) is constructed in a reverse way by using a back shovel of a PC360 excavator.
The beneficial effects of the invention are as follows:
(1) The construction process is scientific, the construction period is short, the treatment effect is good, and the ecological environment is protected;
(2) The method for discharging and treating the three wastes of the garbage is scientific and recyclable;
(3) The mountain body after the field sealing can be planted with green plants, so that ecological re-greening can be realized, and the environment is beautified;
(4) The high-density polyethylene geomembrane is arranged between the two layers of composite drainage networks, the geomembrane is welded by adopting double-weld hot air welding, and clay with the thickness of 300mm is compacted on the geomembrane, so that the geomembrane can be prevented from falling and cracking, surface water is not easy to enter the garbage buried layer, and the seepage-proofing effect is better;
(5) The mountain is provided with green plants, and the mountain-surrounding road are also provided with beautiful scenery, and almost integrated with nearby landforms and scenery;
(6) The complete drainage ditch is also repaired from the top of the mountain to the foot of the mountain, so that rainwater can be prevented from accumulating;
(7) The vertical impervious wall made of cement-bentonite has the advantages of high impervious and waterproof performance, high deformation resistance, low elastic modulus and high shear strength, and can prevent the diffusion of percolate outwards and has long service life.
Detailed Description
The present invention will be further elucidated with reference to the following embodiments, which should be understood as merely illustrative of the invention and not as limiting the scope of the invention.
Taking the XX refuse treatment plant landfill of the Jinzhou city of Liaoning as an example, from the 90 th year of the last century, the domestic refuse of the whole city is completely transported to the landfill, and finally the refuse mountain with the land occupation of more than 3 ten thousand square meters and the height of 90 meters is piled up, wherein the refuse mountain is less than 4 kilometers away from the center of the city, stink is dispersed along with wind, and the center of the city can smell stink sometimes, and the refuse is urgently needed to be treated.
The landfill is located in the valley between two mountains, and the geological conditions of the area are as follows: the fields are respectively from top to bottom: filling soil, gravel powder clay layer, fully weathered granite gneiss, strong weathered granite gneiss, and apoplexy granite gneiss.
According to the investigation report, the field fully weathered granite gnetite, the strongly weathered granite gnetite and the apoplexy granite gnetite belong to the weak permeable layer.
The engineering adopts comprehensive treatment, the irregular mountain bodies are firstly spread out one by one, then are flattened, compacted and covered with soil layer by layer, then a geomembrane is covered, leachate treatment equipment and waste gas guide and discharge torch are arranged, and environmental treatment, greenish and ground bottom seepage prevention are also carried out, so that the invention adopts a novel construction process, and the construction process comprises the following steps:
1. re-testing the original garbage stack: re-measuring the garbage amount of the landfill site, verifying the garbage amount in the drawing, and drawing a garbage stack body amount balance diagram.
2. And compiling a detailed garbage stack body dumping scheme according to the excavation area and the filling area in the drawn garbage stack body square quantity balance diagram.
3. And (5) constructing the construction machinery by entering the working area divided according to the transportation scheme.
1. The garbage in the area of the road of the circular field is dumped to the place to be filled, after the mountain stones are replaced by 1.5m, the seepage liquid amount of the individual areas is large, the geological environment is bad, and the mountain stones are filled to the replacement height after the stones are thrown and silted.
2. The mountain-coiled road is constructed according to the road standard of the surrounding field, and meanwhile, a construction channel for dumping garbage is repaired.
3. And (3) after the garbage in the excavation area is dumped to the filling area, layering and rolling are carried out until the compactness required by the design is reached, and a special garbage compactor is adopted for the compacting machine.
4. The garbage pile body is shaped while digging and filling, so that disturbance to the original garbage pile body is reduced as much as possible, and deodorant is sprayed for deodorization.
5. In construction, the smoke and fire are strictly controlled, the concentration of combustible gases such as methane, marsh gas and the like is always in a dangerous value during the shaping of the pile body, the fire-proof caps are installed on all construction vehicles, the smoke and fire are strictly forbidden by constructors, and the movable toxic and harmful gas monitor monitors in real time.
6. In the construction process, the sanitary work of dust prevention and gas defense and construction site is well done, comprehensive measures are taken, a gas mask is worn, an oxygen bottle is arranged on site, and underground constructors take out the ground to exchange air for 15 minutes every 1 hour.
4. After the pile body is shaped, a rotary digging mode is adopted to drill a gas guiding well and a leachate lifting well on the mountain body.
1. The drilling hole diameter of the gas guide well is 1.0m, the gas guide well is wrapped with geotechnical cloth by using DN200HDPE drilling flower pipes, reinforcement cages with the diameter of 1m are drilled in the holes, and gravel with the grain diameter of 50mm is filled between the flower pipes and the reinforcement cages; the gas guiding well is driven to the ground height;
2. the leachate lifting well is provided with a drilling hole diameter of 1.2m, the leachate lifting well adopts a DN600HDPE drilling flower pipe, the bottom of the leachate lifting well is provided with a solid wall pipe with a length of 1.5m, the pipe is filled with coarse sand with a thickness of 500mm, the pipe wall is wrapped with a single-sided geotechnical composite drainage net, a reinforcement cage with a diameter of 1.2m is arranged in the drilling hole, gravel with a particle size of 80mm is filled between the flower pipe and the reinforcement cage, the leachate lifting well is always driven down to a rock layer, a circle of curtain wall is arranged on the periphery of the leachate lifting well to prevent the leachate from overflowing outwards, the leachate is blocked down by the rock layer, the leachate is blocked in a circular basin, and then the leachate in the well is pumped out.
5. After the well drilling is finished, the mountain is covered for the first time, a layer of the geotechnical composite drainage network with the thickness of 6mm is covered, and the seams are connected in a sewing mode.
6. And (3) making an air guide branch pipe and an air guide main pipe on the geotechnical composite drainage net, and leaving the air guide main pipe on one side of the to-be-built incineration torch.
7. And (5) covering soil, covering clay with the thickness of 300mm, and compacting.
8. Covering a high-density polyethylene geomembrane with a double rough surface of 1.5mm, wherein the geomembrane is welded by adopting double-welding-seam hot air welding.
9. And covering a second layer of the 6mm thick geotechnical composite drainage net.
10. And paving a leachate inverted pipeline on the mountain body and greening the water pipeline.
11. The mountain body is covered with planting soil with the thickness of 800 mm.
12. And constructing a surrounding road and a mountain-turning road structure layer.
13. The mountain is provided with a precast concrete drainage ditch, and the precast concrete drainage ditch is horizontal and longitudinal and the mountain foot is provided with a ring field drainage ditch.
14. Vertical seepage-proofing engineering (which can be carried out simultaneously with three wastes treatment engineering)
And (3) performing seepage prevention treatment by adopting a mode of combining cement-bentonite wall and vertical curtain grouting. The thickness of the cement-bentonite wall is 800mm, the cement-bentonite wall enters the bottom fully weathered rock curtain grouting impervious layer not less than 2m, the maximum depth of the impervious wall is about 15 m, and the permeability coefficient of the impervious wall is less than 1 xL 0 -7 cm/s。
The material composition types of the cement-bentonite wall are determined as follows: water, cement, bentonite, sodium carbonate, retarder, preservative and the like, and comprises the following components in parts by mass: 100 parts of water, 30-40 parts of cement, 60-70 parts of bentonite, 0.6-0.8 part of sodium carbonate, 0.1-0.2 part of retarder and 0.1-0.2 part of preservative, and the final mixing ratio is determined according to field tests.
The cement-bentonite wall adopts a groove grabbing machine and double-wheel milling groove, slurry wall protection and underwater concrete pouring process, and the concrete construction process flow is as follows: measuring paying-off, guiding wall construction, mud preparation, wall grooving construction, cementing bentonite, groove sleeve milling joint construction, waste slurry treatment, and quality detection, wherein the wall walls on two sides of the guiding wall are reinforced before the cement-bentonite wall construction because the cement-bentonite wall (800 mm thick) construction is positioned on a soft soil foundation. The guide wall plays roles of locking a notch, guiding in a groove, storing slurry stabilizing liquid, maintaining upper soil body stability, preventing soil body slump, positioning groove sections in a framing manner, bearing temporary construction load and the like, the depth of the guide wall is 2200mm, a PC360 backhoe excavator is adopted for excavation, a slope is manually repaired, and concrete is poured on groove walls at two sides; the hydraulic grab bucket is adopted to form grooves above the wall grooving construction rock stratum, the grab bucket type grooving machine is provided with an automatic inclinometer and a deviation correcting device, after entering the weathered rock stratum, rock entering drilling is carried out by adopting double-wheel milling, and the depth of the rock entering drilling extends to 2m below the weathered rock stratum; and then pouring cement bentonite into the groove, and excavating after the mortar of the adjacent groove sections reaches a certain strength by adopting a jump method. When the overlapping width of the adjacent groove sections is not less than 20cm and the secondary groove forming construction is carried out between two primary grooves, part of cement-bentonite at the end of the primary groove is milled, and the secondary groove cement-bentonite is combined with the primary groove after pouring to form a joint with better water tightness; can also be connected in a joint pipe mode; the corner is treated according to the T-shaped wall, the width of the end groove section is not less than 2.8m, and the detection is carried out after the wall is formed by 28 d.
The curtain grouting construction process comprises the following steps:
after the garbage mountain is shaped, an auxiliary concrete cover plate is poured at the upper part, the grouting effect is improved, the vertical curtain grouting is designed into double rows of holes, the row spacing and the hole spacing are 1.5 meters, and the downstream row is firstly constructed and then the upstream row is constructed during construction. Curtain grouting is carried out by arranging pilot holes in a first sequence of holes, selecting the pilot holes in a first sequence of holes, setting the interval between the pilot holes to be not less than 15 m, or arranging the pilot holes according to 10% of the total number of holes, carrying out the first sequence of holes, then filling the second sequence of holes, finally filling the third sequence of holes, controlling the interval, depth and full hole inclination of the holes during drilling, carrying out hole wall flushing and crack flushing in a high-flow pressure water pulsation mode after drilling is qualified, immediately and continuously carrying out grouting operation after flushing, and sealing the grouting holes after the full hole grouting is qualified after inspection.
The grouting material adopted in curtain grouting is cement-bentonite, the cement number is not lower than No. 425, the curtain grouting pressure is 0.5-1MPa, the curtain grouting hole depth at least enters into the medium-stroke gneiss, the hole depth requires the final hole Duan Toushui rate q to be less than or equal to 1Lu, the average hole depth is about 40 meters, and the specific hole pitch, row pitch and depth are required to be determined according to the field grouting experiment.
The curtain grouting is carried out in sections, the length of the first section is 2-3 m, the hole is planted in the pipe (the first section is determined by the broken condition of the mountain surface rock), the lengths of the second section, the third section and the fourth section are all 5m, and each section is 2m later until the water permeability of two continuous sections is not more than 1Lu.
The invention arranges probes on the outer side of the poured cement-bentonite impervious wall to monitor whether percolate flows out or not.
Fifteen "three wastes" treatment
Waste gas treatment: waste gas in the mountain is pumped out through air suction and is conveyed to an incineration torch along the air guide main pipe for incineration, heat of the waste gas is recycled, and whether the gas emission after the incineration meets the environmental protection standard is monitored;
and (3) discharging waste water: pumping out the percolate in the mountain body, and adopting an MBR (A/O+external) +NF system treatment process to ensure that the effluent quality reaches GB16889-2008 standard; the MBR (A/O+external) +NF system comprises an adjusting tank, a filter, a first anaerobic tank, a first denitrification nitrogen removal tower, a second anaerobic tank, a second denitrification nitrogen removal tower, a cooling tower, an ultrafiltration membrane device, a nanofiltration membrane device, a reverse osmosis membrane device and a monitoring device which are sequentially connected.
And (3) soil remediation: the method comprises the steps of adopting a solidification/stabilization technology and a thermal desorption technology to treat heavy metals and organic matters in soil, wherein the solidification/stabilization technology is to dig polluted soil to crush and stir, adding a determined amount of water and a medicament into a stirrer, transporting to clean soil for covering and curing after stirring, and removing heavy metal pollution of the soil. Checking and accepting according to the sulfuric acid method of HJ/T299-2007 solid waste leaching toxicity leaching method, wherein the heavy metal leaching concentration is lower than the quality index limit value of the underground water class III, namely the qualified soil is used as a roadbed material and applied to roadbed construction.
The thermal desorption technology is that after the contaminated soil is excavated, crushing and screening are carried out, the size of the contaminated soil is smaller than 5cm, the contaminated soil enters a temporary storage area for temporary storage, the contaminated soil is mixed with the treated clean soil, and the contaminated soil enters an alloy rotary dryer after the water content is regulated to be smaller than 25%; the treated soil is backfilled after being cooled by a humidifier or is used as a soil moisture conditioner to be mixed with the polluted soil, and the organic matter pollution in the treated soil can be effectively treated.
The full-coverage sealing, environmental treatment and greening process of the large-scale landfill is suitable for the treatment of municipal solid waste landfill, the former garbage mountain is changed into the current Qingshan, the mountain has no peculiar smell, the mountain is stood on the top to be at eye, the mountain is wide in the sky and long in grass and covered in the wild, the urban land is formed, the process is scientific and advanced, the landfill can be treated anywhere, and the popularization is worth.
It should be noted that the foregoing merely illustrates the technical idea of the present invention and is not intended to limit the scope of the present invention, and that a person skilled in the art may make several improvements and modifications without departing from the principles of the present invention, which fall within the scope of the claims of the present invention.
Claims (8)
1. A full-coverage sealing field, environment treatment and greening process for a large-scale refuse landfill is characterized in that: comprises the following steps
1. Pile body shaping
Measuring the garbage amount of an original garbage stack body, verifying the garbage amount in a drawing, and drawing a garbage stack body amount balance diagram;
step (2) compiling a detailed garbage stack body dumping scheme according to the excavation area and the filling area in the drawn garbage stack body square quantity balance diagram;
step (3), working areas are divided according to a shipping scheme, and construction machinery enters the field to construct:
a. the garbage in the area of the road of the circular field is dumped to the place to be filled, and the mountain-rind stone is replaced for 1.5m to the replacement height after the garbage is squeezed to be silted;
b. constructing the mountain-turning road according to the road standard of the surrounding field, and repairing a construction channel for dumping garbage;
c. after the garbage in the excavated area is dumped to the filling area, layering and rolling are carried out until the compactness required by design is reached;
d. shaping the garbage pile body while digging and filling, and spraying deodorant for deodorizing with as little disturbance to the original garbage pile body as possible;
e. the smoke and fire are strictly controlled in construction, the concentration of the combustible gas, namely methane and biogas, is always in a dangerous value during the shaping of the pile body, the fire-proof caps are installed on all construction vehicles, the smoke and fire are strictly forbidden by construction personnel, and a movable toxic and harmful gas monitor monitors in real time;
2. sealing field
After the pile body shaping in the step (4) is finished, a rotary digging mode is adopted to drill a gas guiding well and a leachate lifting well on the garbage mountain body:
a. the drilling hole diameter of the gas guide well is 1.0m, the gas guide well is wrapped with geotechnical cloth by using DN200HDPE drilling flower pipes, reinforcement cages with the diameter of 1m are drilled in the holes, and gravel with the grain diameter of 50mm is filled between the flower pipes and the reinforcement cages;
b. the drilling aperture of the leachate lifting well is 1.2m, the leachate lifting well adopts a DN600HDPE drilling flower pipe, the bottom of the leachate lifting well is a solid wall pipe with the length of 1.5m, the pipe is filled with middle coarse sand with the thickness of 500mm, the pipe wall wraps a single-sided geotechnical composite drainage net, the diameter of the steel reinforcement cage with the diameter of 1.2m is arranged in the drilling hole, and gravel with the particle size of 80mm is filled between the flower pipe and the steel reinforcement cage;
covering the mountain for the first time after the drilling is finished, covering a layer of the 6 mm-thick geotechnical composite drainage network, and connecting seams in a sewing mode;
step (6), making an air guide branch pipe and an air guide main pipe on the geotechnical composite drainage net, and leaving the air guide main pipe at one side of the to-be-built incineration torch;
step (7), covering clay with the thickness of 300mm, and compacting;
step (8) covering a high-density polyethylene geomembrane with double rough surfaces of 1.5mm thickness, wherein the geomembrane is welded by adopting double-weld hot air welding;
step (9) covering a second layer of 6 mm-thick geotechnical composite drainage net;
step (10), paving a leachate inverted pipeline and a greening water pipeline on the mountain;
step (11), covering the mountain with planting soil with the thickness of 800mm, and planting green plants on the planting soil;
step (12) construction of a road structure layer of a surrounding field road and a mountain-like road;
step (13) installing prefabricated transverse and longitudinal concrete drainage ditches and mountain foot ring field drainage ditches on the mountain body;
3. treatment of three wastes
And (4) waste gas treatment: waste gas in the mountain is pumped out through air suction and is conveyed to an incineration torch along the air guide main pipe for incineration, heat of the waste gas is recycled, and whether the gas emission after the incineration meets the environmental protection standard is monitored;
and (3) wastewater discharge: pumping out percolate in the mountain body, and adopting an external MBR+NF system treatment process to ensure that the quality of effluent reaches the standard;
the soil below the original garbage field is restored in the step (16): adopting a solidification/stabilization technology and a thermal desorption technology to treat heavy metals and organic matters in soil, wherein a detection result meets the regulations; the site after soil remediation is used as a living site and a commercial site;
4. vertical impermeable treatment
Piling along the periphery of the mountain body built in the step (13), wherein the depth extends to the weathered rock layer;
digging grooves of the underground continuous wall, wherein the depth of the grooves extends to 2m below the weathered rock layer;
step (19), arranging probes outside the grooves;
step (20) pouring cement-bentonite into the grooves to form a soil wall, wherein the cement-bentonite is prepared from the following raw materials in parts by mass: 100 parts of water, 30-40 parts of cement, 60-70 parts of bentonite, 0.6-0.8 part of sodium carbonate, 0.1-0.2 part of retarder and 0.1-0.2 part of preservative;
the cement-bentonite wall adopts a groove grabbing machine and double-wheel milling groove, slurry wall protection and underwater concrete pouring process, and the concrete construction process flow is as follows: measuring and paying off, guiding wall construction, mud preparation, wall grooving construction, cementing bentonite, groove sleeve milling joint construction, waste slurry treatment, wastewater treatment and quality detection, wherein the cement-bentonite wall construction is positioned on a soft soil foundation, so that the groove walls on the two sides of the guiding wall are reinforced before the cement-bentonite wall construction; the guide wall plays roles of locking a notch, guiding in a groove, storing slurry stabilizing liquid, maintaining upper soil body stability, preventing soil body slump, framing and positioning groove sections and bearing temporary construction load, the depth of the guide wall is 2200mm, a PC360 backhoe excavator is adopted for excavation, a slope is manually repaired, and concrete is poured on groove walls at two sides; the hydraulic grab bucket is adopted to form grooves above the wall grooving construction rock stratum, the grab bucket type grooving machine is provided with an automatic inclinometer and a deviation correcting device, after entering the weathered rock stratum, rock entering drilling is carried out by adopting double-wheel milling, and the depth of the rock entering drilling extends to 2m below the weathered rock stratum; then pouring cement bentonite into the tank, adopting a jump method construction method, and excavating after the mortar of the adjacent tank sections is initially set to reach a certain strength; when the overlapping width of the adjacent groove sections is not less than 20cm and the secondary groove forming construction is carried out between two primary grooves, part of cement-bentonite at the end of the primary groove is milled, and the secondary groove cement-bentonite is combined with the primary groove after pouring to form a joint with better water tightness; the corner is treated according to the T-shaped wall, the width of the end groove section is not less than 2.8m, and the detection is carried out after the wall is formed by 28 d.
2. The full coverage sealing, environmental treatment and re-greening process of a large landfill according to claim 1, wherein the process comprises the following steps: and (3) transporting the garbage to the position to be filled, squeezing the garbage to form sludge by using a road roller, wherein the surface of a grinding wheel of the road roller is provided with spines.
3. The full coverage sealing, environmental treatment and re-greening process of a large landfill according to claim 1, wherein the process comprises the following steps: and (3) all constructors need to be provided with a gas mask in the construction process of the step (3).
4. The full coverage sealing, environmental treatment and re-greening process of a large landfill according to claim 1, wherein the process comprises the following steps: the external MBR+NF system comprises an adjusting tank, a filter, a first anaerobic tank, a first denitrification and denitrogenation tower, a second anaerobic tank, a second denitrification and denitrogenation tower, a cooling tower, an ultrafiltration membrane device, a nanofiltration membrane device, a reverse osmosis membrane device and a monitoring device which are sequentially connected.
5. The full coverage sealing, environmental treatment and re-greening process of a large landfill according to claim 1, wherein the process comprises the following steps: in the solidification/stabilization technique in the step (16), the contaminated soil is dug up, crushed and stirred, a certain amount of water and a certain amount of chemical agent are added into the stirrer, and the stirred soil is transported to a clean soil area for covering and maintenance, so that the heavy metal pollution of the soil can be removed.
6. The full coverage sealing, environmental treatment and re-greening process for a large landfill according to claim 5, wherein the full coverage sealing, environmental treatment and re-greening process is characterized in that: the thermal desorption technology in the step (16) is that after the contaminated soil is excavated, crushing and screening are carried out, the size of the contaminated soil is smaller than 5cm, the contaminated soil enters a temporary storage area for temporary storage, the contaminated soil is mixed with the treated clean soil, and the contaminated soil enters an alloy rotary dryer after the water content is regulated to be smaller than 25%; the treated soil is backfilled after being cooled by a humidifier or is used as a soil moisture conditioner to be mixed with the polluted soil, and the organic matter pollution in the treated soil is effectively treated.
7. The full coverage sealing, environmental treatment and re-greening process of a large landfill according to claim 1, wherein the process comprises the following steps: and (18) arranging guide walls above the two side walls of the groove.
8. The full coverage sealing, environmental treatment and re-greening process of a large landfill according to claim 1, wherein the process comprises the following steps: and (5) reversing the groove by adopting a back shovel of a PC360 excavator.
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