CN113578915A - Screening and decrement treatment system and method for stock garbage - Google Patents
Screening and decrement treatment system and method for stock garbage Download PDFInfo
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- CN113578915A CN113578915A CN202110672355.5A CN202110672355A CN113578915A CN 113578915 A CN113578915 A CN 113578915A CN 202110672355 A CN202110672355 A CN 202110672355A CN 113578915 A CN113578915 A CN 113578915A
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- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 184
- 238000012216 screening Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 27
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000000463 material Substances 0.000 claims abstract description 60
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- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B15/00—Combinations of apparatus for separating solids from solids by dry methods applicable to bulk material, e.g. loose articles fit to be handled like bulk material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
Abstract
The invention discloses a screening decrement processing system and a screening decrement processing method for stored garbage, which comprise a gas injection device, a gas extraction device, a methane concentration detection device, an airing system, a crushing device, a screening device, a sorting device, a winnowing device, a magnetic separation device and a leachate collection device; the gas injection device injects inert gas into the garbage pile, and simultaneously the gas extraction device extracts landfill gas in the garbage pile, so that the concentration of methane in the garbage pile is reduced, and the excavation safety is improved; the drying system that sets up can reduce the water content of stock rubbish, improves follow-up screening effect. The processing method comprises the following steps: the stored garbage is aired before being screened, so that the water content of the fed material is controlled to be below 30%, and the screening effect is obvious; the stored garbage is sequentially subjected to airing, crushing, screening, sorting, winnowing and magnetic separation, and the disposal of the screened products is reasonable, so that the project production stop risk caused by unsmooth outlet of the screened products is avoided, and the problem of secondary pollution in the outward transportation process of the screened products can be avoided.
Description
Technical Field
The invention relates to the technical field of stock waste treatment, in particular to a system and a method for screening and decrement treatment of stock waste.
Background
The existing screening and decrement treatment system for the stored garbage is mainly applied to comprehensive treatment of a simple household garbage landfill, the stored garbage is transported to a screening and decrement workshop after being excavated and is transported to an even kickoff machine through a chain plate conveyor, the even kickoff machine sends the stored garbage to a magnetic separator, and iron-containing metals in the stored garbage are sorted out at the magnetic separator. The storage garbage is conveyed to a drum screening machine by a belt conveyor after a magnetic separator, one part of the storage garbage is divided into two parts, namely oversize materials (the particle size is larger than 25mm) and undersize materials (the particle size is smaller than 25mm), the undersize materials are mainly humus, and the oversize materials are divided into light materials (plastic bags and the like), medium-density materials (fabrics, plastic bottles, glass and the like) and heavy materials (bricks, stones and the like) after passing through a winnowing machine. The separated heavy metal, light material (plastic bag, etc.) and dense material (fabric, plastic bottle, glass, etc.) are sold to resource regeneration enterprises, the humus soil can be used for landscaping after composting, and the heavy material (brick, stone, etc.) can be used as building waste to be sent into brick making factories or other legal utilization ways.
The existing method for treating the inventory garbage has the following defects:
1) the prior stabilizing measure for reducing the methane concentration in the stock waste pile is lacked before excavation construction, the methane concentration in the stock waste pile is not monitored in real time, and the violent construction has a larger risk of methane poisoning of personnel.
2) The existing garbage excavation is different from general earthwork excavation, leachate and methane gas are continuously generated due to the anaerobic fermentation of organic matters in the existing garbage, and serious problems of leachate cross flow, odor overflow and the like can be generated when effective pollution control measures are not taken in the excavation process, so that the surrounding environment is polluted, and the resistance of nearby residents is easily caused.
3) Rainfall is more in south, the moisture content of the stored garbage is generally more than 50%, the garbage directly enters screening equipment without airing, and the expected screening effect is difficult to achieve due to overhigh moisture content.
4) The screening products are not practical, the main humic soil compost products, light materials (plastic bags and the like) and medium-density materials (fabrics, plastic bottles, glass and the like) are not good in sales, and investigation shows that due to the fact that the screening products do not have proper routes in part of screening projects, the projects are shut down and even environmental protection supervision is incurred.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a screening and decrement treatment system for the stored garbage, wherein an air injection device is arranged for injecting inert gas into a stored garbage pile so as to improve the safety of excavation, and an air drying system is arranged so as to reduce the water content of the stored garbage and improve the subsequent screening effect; the invention also aims to provide a method for screening and reducing the amount of the stored garbage, which adopts a gas injection stabilization method to reduce the methane concentration in the stored garbage pile, reduces the water content of the stored garbage feed before screening, improves the screening effect and reasonably disposes the screened products.
One of the purposes of the invention is realized by adopting the following technical scheme:
a screening decrement processing system for stored garbage comprises a gas injection device, a gas extraction device, a methane concentration detection device, a drying system, a crushing device, a screening device, a sorting device, a winnowing device, a magnetic separation device and a leachate collection device; the gas injection device is connected with the storage garbage pile and used for injecting inert gas into the storage garbage pile, the gas extraction device is connected with the storage garbage pile and used for extracting landfill gas in the storage garbage pile, and the methane concentration detection device is connected with the storage garbage pile and used for detecting the methane concentration in the storage garbage pile; the airing system is connected with the storage garbage pile and is used for reducing the water content of the storage garbage; a leachate outlet of the airing system, a leachate outlet of the screening device and a leachate outlet of the sorting device are respectively connected with a leachate collecting device;
the storage garbage outlet of the airing system is connected with the storage garbage inlet of the crushing device, and the storage garbage outlet of the crushing device is connected with the storage garbage inlet of the screening device; the undersize outlet of the screening device is connected with the undersize inlet of the sorting device, and the oversize outlet of the screening device and the oversize outlet of the sorting device are respectively connected with the winnowing device; the air separation device is used for separating heavy objects, medium objects and light objects, and a medium object outlet of the air separation device is connected with a medium object inlet of the magnetic separation device.
Furthermore, the screening and decrement treatment system for the inventory garbage further comprises a sewage treatment system, and a leachate outlet of the leachate collecting device is connected with a leachate inlet of the sewage treatment system. The sewage treatment system is used for treating leachate generated in the airing, screening and sorting processes, leachate generated in the excavation of storage garbage, tail water of workshop cleaning and biological deodorization equipment and the like. The sewage treatment system adopts a two-stage high-pressure reverse osmosis membrane (DTRO).
Still further, the airing system comprises an airing chamber, a grab bucket device, a fan, a ventilation pipeline, a leachate collecting tank and an exhaust device, wherein the grab bucket device is arranged in the airing chamber, and the fan is arranged at the bottom of the airing chamber; the ventilating duct is arranged in the airing chamber and communicated with an air outlet of the fan; the leachate collecting tank is arranged at the bottom of the drying chamber; the exhaust device is arranged at the upper part of the airing chamber.
Further, the airing system further comprises a travelling crane guide rail and a pulley device arranged on the travelling crane guide rail, and the grab bucket device is arranged on the pulley device.
And the screening and decrement treatment system for the stored garbage further comprises a fog gun machine and an impermeable membrane, wherein the fog gun machine is arranged on one side of the stored garbage pile and used for spraying a deodorizing agent, and the impermeable membrane is used for covering the stored garbage in the airing chamber.
Furthermore, the screening and decrement treatment system for the garbage stocks further comprises a vibration hopper, and the vibration hopper is arranged between the crushing device and the screening device.
The second purpose of the invention is realized by adopting the following technical scheme:
a method for screening and reducing the amount of the stored garbage is a treatment method based on the system for screening and reducing the amount of the stored garbage, and comprises the following steps:
1) before the garbage storage is excavated, inert gas is injected into the garbage storage pile through a gas injection device, and meanwhile, landfill gas in the garbage storage pile is pumped out through a gas extraction device; then detecting the methane concentration by a methane concentration detection device, and excavating the stored garbage after the detection is passed;
2) conveying the dug-out stored garbage to an airing system to reduce the water content of the stored garbage;
3) conveying the stored garbage processed by the airing system to a crushing device, and then conveying the garbage to a screening device to obtain oversize products and undersize products;
4) conveying undersize products of the screening device to a sorting device to obtain oversize products and undersize products; the undersize is humus soil which is temporarily stored and then transported to a sanitary landfill for treatment;
5) conveying oversize materials of the screening device obtained in the step 3) and oversize materials of the sorting device obtained in the step 4) to a winnowing device to obtain heavy materials, medium materials and light materials; wherein, the heavy materials are bricks, stones and the like, and are transported to a brick making factory or other legal utilization ways after entering a storage area through a conveying belt.
6) And 5) conveying the medium substances obtained in the step 5) to a magnetic separation device to obtain oversize products and undersize products, wherein the undersize products are metal, and the metal is sold to resource regeneration enterprises.
Further, in the step 1), when the detected methane concentration is not more than 5%, excavating storage garbage; when the detected methane concentration exceeds 5%, the inert gas injection and the landfill gas extraction are continued.
And further, in the step 2), the water content of the garbage stock treated by the airing system is 10-30%.
Further, the method also comprises the step 7): and (3) taking oversize products of the magnetic separation device obtained in the step 6) and light products of the air separation device obtained in the step 5) as combustible materials, and conveying the combustible materials to an incineration plant for incineration treatment.
Compared with the prior art, the invention has the beneficial effects that:
(1) the gas injection device arranged in the screening and decrement treatment system for the stored garbage injects inert gas into the stored garbage pile, and simultaneously the gas extraction device extracts landfill gas in the stored garbage pile, so that the concentration of methane in the stored garbage pile is reduced, and the excavation safety is improved; the drying system that sets up can reduce the water content of stock rubbish, improves follow-up screening effect. The stored garbage sequentially passes through the airing system, the screening device, the sorting device, the winnowing device and the magnetic separation device, so that the humus soil, the light substances, the medium substances and the heavy substances are screened in order.
(2) According to the airing system, the stored garbage is subjected to centralized drying treatment in the airing chamber, and the air flow in the cabin is accelerated through the cooperation of the fan and the exhaust device, so that the airing time is shortened; meanwhile, a leachate collecting tank is arranged, so that the situation that the garbage leachate in the stored garbage is discharged outside to pollute the environment is avoided; the moisture content of the screened and reduced material of the stored garbage can be reduced from 50% to below 30% in a short time (3-7 days), the treatment efficiency is improved, and the subsequent screening effect is improved.
(3) According to the screening and decrement treatment method for the stored garbage, inert gas and exhaust landfill gas are injected before excavation, so that the concentration of methane in a stored garbage pile is reduced, and the risk of methane poisoning of personnel in the excavation construction process is effectively avoided; the stored garbage is aired before being screened, so that the water content of the fed material is controlled to be below 30%, and the screening effect is obvious; the stored garbage is sequentially subjected to airing, crushing, screening, sorting, winnowing and magnetic separation, so that the humus soil, the light substances, the medium substances and the heavy substances are sequentially screened, the treatment direction of screened products is reasonable, the risk of project production halt caused by unsmooth outlet of the screened products is avoided, and the problem of secondary pollution in the process of transporting the screened products outside can be avoided.
(4) In the method for screening and reducing the amount of the stored garbage, the undersize obtained by the sorting device is humus soil which is transported to a sanitary landfill site for landfill disposal; the heavy material obtained by the winnowing device is a brick stone and is transported to a brick making factory or other legal utilization ways; the heavy metal separated by the magnetic separation device is sold to resource regeneration enterprises; the light objects obtained by the winnowing device and oversize objects of the magnetic separator are plastic and fabric substances, are transported to a burning plant for burning treatment, the disposal of the screened products is reasonable,
drawings
FIG. 1 is a process flow diagram of example 1;
FIG. 2 is a perspective view of the airing system of embodiment 2;
in the figure: 1. an airing chamber; 12. a feed inlet; 13. a discharge port; 2. a grab bucket device; 3. a fan; 4. a ventilation duct; 5. an exhaust device; 6. a leachate collecting tank; 61. a leachate collection tank; 7. a travelling guide rail; 8. a pulley device.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example 1
As shown in fig. 1, a screening and decrement treatment system for stored garbage comprises a gas injection device, a gas extraction device, a methane concentration detection device, an airing system, a crushing device, a screening device, a sorting device, a winnowing device, a magnetic separation device and a leachate collection device; the gas injection device is connected with the storage garbage pile and used for injecting inert gas into the storage garbage pile, the gas extraction device is connected with the storage garbage pile and used for extracting landfill gas in the storage garbage pile, and the methane concentration detection device is connected with the storage garbage pile and used for detecting the methane concentration in the storage garbage pile; the airing system is used for reducing the water content of the stored garbage; a leachate outlet of the airing system, a leachate outlet of the screening device and a leachate outlet of the sorting device are respectively connected with a leachate collecting device;
the storage garbage outlet of the airing system is connected with the storage garbage inlet of the crushing device, and the storage garbage outlet of the crushing device is connected with the storage garbage inlet of the screening device; the undersize outlet of the screening device is connected with the undersize inlet of the sorting device, and the oversize outlet of the screening device and the oversize outlet of the sorting device are respectively connected with the winnowing device; the air separation device is used for separating heavy objects, medium objects and light objects, and a medium object outlet of the air separation device is connected with a medium object inlet of the magnetic separation device.
A method for screening and reducing amount of stored garbage comprises the following steps:
1) injecting nitrogen into the garbage pile through a gas injection device before excavating the garbage pile, and simultaneously pumping landfill gas in the garbage pile out through a gas extraction device; detecting that the concentration of methane is not more than 5% by a methane concentration detection device, and excavating the stored garbage after the detection is passed;
2) conveying the dug-out stored garbage to a drying system, and drying until the water content of the stored garbage is 30%;
3) conveying the stored garbage processed by the airing system to a crushing device, and then conveying the garbage to a screening device to obtain oversize products and undersize products;
4) conveying undersize products of the screening device to a sorting device to obtain oversize products and undersize products; the undersize is humus soil which is temporarily stored and then transported to a sanitary landfill for treatment;
5) conveying oversize materials of the screening device obtained in the step 3) and oversize materials of the sorting device obtained in the step 4) to a winnowing device to obtain heavy materials, medium materials and light materials; wherein, the heavy materials are bricks, stones and the like, and are transported to a brick making factory or other legal utilization ways after entering a storage area through a conveying belt.
6) And 5) conveying the medium substances obtained in the step 5) to a magnetic separation device to obtain oversize products and undersize products, wherein the undersize products are metal, and the metal is sold to resource regeneration enterprises.
7) And (3) taking oversize products of the magnetic separation device obtained in the step 6) and light products of the air separation device obtained in the step 5) as combustible materials, and conveying the combustible materials to an incineration plant for incineration treatment.
Example 2
A screening and decrement treatment system for stored garbage comprises a gas injection device, a gas extraction device, a methane concentration detection device, a drying system, a crushing device, a vibration hopper, a screening device, a sorting device, a winnowing device, a magnetic separation device and a leachate collection device; the gas injection device is connected with the storage garbage pile and used for injecting inert gas into the storage garbage pile, the gas extraction device is connected with the storage garbage pile and used for extracting landfill gas in the storage garbage pile, and the methane concentration detection device is connected with the storage garbage pile and used for detecting the methane concentration in the storage garbage pile; the airing system is used for reducing the water content of the stored garbage; a leachate outlet of the airing system, a leachate outlet of the screening device and a leachate outlet of the sorting device are respectively connected with a leachate collecting device; wherein, screening plant is the drum sieve, and sorting unit is the dish sorter. The vibrating hopper is arranged between the crushing device and the screening device.
The storage garbage outlet of the airing system is connected with the storage garbage inlet of the crushing device, and the storage garbage outlet of the crushing device is connected with the storage garbage inlet of the screening device; the undersize outlet of the screening device is connected with the undersize inlet of the sorting device, and the oversize outlet of the screening device and the oversize outlet of the sorting device are respectively connected with the winnowing device; the air separation device is used for separating heavy objects, medium objects and light objects, and a medium object outlet of the air separation device is connected with a medium object inlet of the magnetic separation device.
The screening and decrement treatment system for the inventory garbage further comprises a sewage treatment system, and a leachate outlet of the leachate collecting device is connected with a leachate inlet of the sewage treatment system. The sewage treatment system is used for treating leachate generated in the airing, screening and sorting processes, leachate generated in the excavation of storage garbage, tail water of workshop cleaning and biological deodorization equipment and the like. The sewage treatment system adopts a two-stage high-pressure reverse osmosis membrane (DTRO).
As shown in fig. 2, the airing system includes an airing chamber 1, a grab bucket device 2, a fan 3, a ventilation duct 4, a leachate collecting tank 6, an exhaust device 5, a traveling guide rail 7, and a pulley device 8 disposed on the traveling guide rail 7. A feed inlet 12 and a discharge outlet 13 are respectively arranged on the inner side wall of the airing chamber 1; the grab bucket device 2 is arranged in the airing chamber 1, and the fan 3 is arranged at the bottom of the airing chamber 1; the ventilating duct 4 is arranged inside the airing chamber 1 and communicated with an air outlet of the fan 3; the leachate collecting tank 6 is arranged at the bottom of the drying chamber 1, and the leachate collecting tank 6 is connected with an external leachate collecting tank 61; the exhaust device 5 is provided at the upper part of the drying chamber 1.
The grab bucket device 2 is used for transferring the stored garbage, the fan 3 is used for ventilating the inside of the airing chamber 1, the exhaust device 5 is used for replacing the air in the airing chamber 1 to the outside, and the fan 3 is matched with the exhaust device 5 to accelerate the evaporation of the moisture of the stored garbage. The leachate collecting tank 6 is used for collecting and draining garbage leachate generated during the airing of the stored garbage. The exhaust device 5 is an exhaust fan. The grab bucket device 2 is arranged on the pulley device 8. The travelling guide rail 7 is arranged between the feed inlet 12 and the discharge outlet 13 of the airing chamber 1, and the trolley device 8 slides on the travelling guide rail 7, so that the grab bucket device 2 can transfer the stored garbage at the feed inlet 12 and the discharge outlet 13.
A method for screening and reducing amount of stored garbage comprises the following steps:
1) injecting nitrogen into the garbage pile through a gas injection device before excavating the garbage pile, and simultaneously pumping landfill gas in the garbage pile out through a gas extraction device; detecting that the concentration of methane is not more than 5% by a methane concentration detection device, and excavating the stored garbage after the detection is passed;
2) the dug-out stored garbage is conveyed to the airing chamber 1, the pulley device 8 drives the grab bucket device 2 to move to the feeding hole 12 of the airing chamber 1 along the trolley guide rail 7, the grab bucket device 2 grabs the stored garbage at the feeding hole 12, jaw plates on the grab bucket device 2 are opened, the stored garbage is gradually scattered, meanwhile, the pulley device 8 is controlled to move at a constant speed along the trolley guide rail 7, the stored garbage can be uniformly scattered on the bottom surface of the airing chamber 1, the whole airing chamber 1 is fully distributed, and the operation of the grab bucket device 2 is repeated until the stored garbage is accumulated at the bottom of the airing chamber 1 to form a material accumulation layer with the thickness of 50-100 cm. Starting the fan 3, discharging wind formed by the fan 3 from the air outlet to a ventilating duct 4 arranged at the bottom of the material accumulation layer, and continuously ventilating the material accumulation layer through the ventilating duct 4; meanwhile, the exhaust device 5 arranged above the drying chamber 1 is opened to continuously exhaust the air in the drying chamber 1, and the exhaust speed of the exhaust device 5 can be adjusted according to the area of the drying chamber 1 and the number of the exhaust devices 5.
After 3-7 days, obtaining a dry material with the water content of less than 30%, driving the grab bucket device 2 to move to a discharge port of the drying chamber 1 by the pulley device 8, and grabbing the dry material to a discharge port 13 of the drying chamber 1 by the grab bucket device 2 to be conveyed out;
3) conveying the garbage stocks processed by the airing system to a crushing device by using a loading vehicle for crushing, then conveying the garbage stocks to a vibrating hopper, and conveying the garbage stocks to a drum screen by using the vibrating hopper to obtain oversize products and undersize products;
4) conveying undersize of the drum screen to a disc type sorting machine to obtain oversize and undersize; the undersize is humus soil which is temporarily stored and then transported to a sanitary landfill for treatment;
5) conveying oversize materials of the drum screen obtained in the step 3) and oversize materials of the disc type sorting machine obtained in the step 4) to a winnowing device to obtain heavy materials, medium materials and light materials; wherein, the heavy materials are bricks, stones and the like, and are transported to a brick making factory or other legal utilization ways after entering a storage area through a conveying belt.
6) And 5) conveying the medium substances obtained in the step 5) to a magnetic separation device to obtain oversize products and undersize products, wherein the undersize products are metal, and the metal is sold to resource regeneration enterprises.
7) And (3) taking oversize products of the magnetic separation device obtained in the step 6) and light products of the air separation device obtained in the step 5) as combustible materials, and conveying the combustible materials to an incineration plant for incineration treatment.
Example 3
A screening decrement processing system for stored garbage comprises a gas injection device, a gas extraction device, a methane concentration detection device, a drying system, a crushing device, a screening device, a sorting device, a winnowing device, a magnetic separation device and a leachate collection device; the gas injection device is connected with the storage garbage pile and used for injecting inert gas into the storage garbage pile, the gas extraction device is connected with the storage garbage pile and used for extracting landfill gas in the storage garbage pile, and the methane concentration detection device is connected with the storage garbage pile and used for detecting the methane concentration in the storage garbage pile; the airing system is used for reducing the water content of the stored garbage; a leachate outlet of the airing system, a leachate outlet of the screening device and a leachate outlet of the sorting device are respectively connected with a leachate collecting device; the garbage airing device is characterized by further comprising a fog gun machine and an anti-seepage film, wherein the fog gun machine is arranged on one side of the garbage storage pile and used for spraying a deodorizing agent, and the anti-seepage film is used for covering the garbage storage in the airing chamber.
The storage garbage outlet of the airing system is connected with the storage garbage inlet of the crushing device, and the storage garbage outlet of the crushing device is connected with the storage garbage inlet of the screening device; the undersize outlet of the screening device is connected with the undersize inlet of the sorting device, and the oversize outlet of the screening device and the oversize outlet of the sorting device are respectively connected with the winnowing device; the air separation device is used for separating heavy objects, medium objects and light objects, and a medium object outlet of the air separation device is connected with a medium object inlet of the magnetic separation device.
A method for screening and reducing amount of stored garbage comprises the following steps:
1) injecting nitrogen into the garbage pile through a gas injection device before excavating the garbage pile, and simultaneously pumping landfill gas in the garbage pile out through a gas extraction device; detecting that the concentration of methane is not more than 5% by a methane concentration detection device, and excavating the stored garbage after the detection is passed; the combination excavation face and topography relief set up escape canal and leachate collecting pit, cover prevention of seepage membrane to the excavation face, realize the reposition of redundant personnel of rain and sewage. Meanwhile, the deodorizing plant liquid is regularly sprayed by the fog gun machine, so that the dust falling and deodorizing effects are achieved.
2) Conveying the dug-out garbage stocks to an airing room, spreading the garbage stocks on the bottom surface of the airing room by a bulldozer, wherein the spreading thickness is 50-100 cm, and airing 10 days by adopting a natural ventilation airing mode, wherein the water content of the garbage stocks is 30%.
3) Conveying the stored garbage processed by the airing system to a crushing device, and then conveying the garbage to a screening device to obtain oversize products and undersize products;
4) conveying undersize products of the screening device to a sorting device to obtain oversize products and undersize products; the undersize is humus soil which is temporarily stored and then transported to a sanitary landfill for treatment;
5) conveying oversize materials of the screening device obtained in the step 3) and oversize materials of the sorting device obtained in the step 4) to a winnowing device to obtain heavy materials, medium materials and light materials; wherein, the heavy materials are bricks, stones and the like, and are transported to a brick making factory or other legal utilization ways after entering a storage area through a conveying belt.
6) And 5) conveying the medium substances obtained in the step 5) to a magnetic separation device to obtain oversize products and undersize products, wherein the undersize products are metal, and the metal is sold to resource regeneration enterprises.
7) And (3) taking oversize products of the magnetic separation device obtained in the step 6) and light products of the air separation device obtained in the step 5) as combustible materials, and conveying the combustible materials to an incineration plant for incineration treatment.
Particularly, the sewage generated in the whole process flow is properly collected and can be discharged after being treated so as to meet the requirement of environmental protection and discharge. The main sewage producing links comprise stock garbage excavation, airing, screening, vehicle and workshop cleaning, biological deodorization equipment tail water and the like. The sewage can be discharged outside after being treated by the sewage treatment device, and the treatment process adopts two stages of DTRO (high pressure reverse osmosis membrane).
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A screening decrement processing system for stored garbage is characterized by comprising a gas injection device, a gas extraction device, a methane concentration detection device, an airing system, a crushing device, a screening device, a sorting device, a winnowing device, a magnetic separation device and a leachate collection device; the gas injection device is connected with the storage garbage pile and used for injecting inert gas into the storage garbage pile, the gas extraction device is connected with the storage garbage pile and used for extracting landfill gas in the storage garbage pile, and the methane concentration detection device is connected with the storage garbage pile and used for detecting the methane concentration in the storage garbage pile; the airing system is connected with the storage garbage pile; a leachate outlet of the airing system, a leachate outlet of the screening device and a leachate outlet of the sorting device are respectively connected with a leachate collecting device;
the storage garbage outlet of the airing system is connected with the storage garbage inlet of the crushing device, and the storage garbage outlet of the crushing device is connected with the storage garbage inlet of the screening device; the undersize outlet of the screening device is connected with the undersize inlet of the sorting device, and the oversize outlet of the screening device and the oversize outlet of the sorting device are respectively connected with the winnowing device; the air separation device is used for separating heavy objects, medium objects and light objects, and a medium object outlet of the air separation device is connected with a medium object inlet of the magnetic separation device.
2. The system for screening and reducing waste inventory of claim 1, further comprising a sewage treatment system, wherein the leachate outlet of the leachate collection device is connected to a leachate inlet of the sewage treatment system.
3. The system for screening and decrement processing of the garbage inventory as claimed in claim 1, wherein the air-curing system comprises an air-curing chamber, a grab bucket device, a fan, a ventilation duct, a leachate collecting tank and an exhaust device, the grab bucket device is arranged in the air-curing chamber, and the fan is arranged at the bottom of the air-curing chamber; the ventilating duct is arranged in the airing chamber and communicated with an air outlet of the fan; the leachate collecting tank is arranged at the bottom of the drying chamber; the exhaust device is arranged at the upper part of the airing chamber.
4. The system for screening and reducing the amount of garbage stored in the container as claimed in claim 3, wherein the air-drying system further comprises a traveling rail and a trolley device disposed on the traveling rail, and the grab bucket device is disposed on the trolley device.
5. The system for screening and reducing the amount of garbage stored in the storage chamber according to claim 1, wherein the system for screening and reducing the amount of garbage stored in the storage chamber further comprises a fog gun and an impermeable membrane, the fog gun is arranged on one side of the storage garbage pile and used for spraying a deodorizing agent, and the impermeable membrane is used for covering the storage garbage in the airing chamber.
6. The system for screening and reducing waste inventory of claim 1, further comprising a vibratory hopper disposed between the crushing device and the screening device.
7. A method for treating garbage inventory by screening and reducing the amount of garbage, which is characterized by comprising the steps of:
1) before the garbage storage is excavated, inert gas is injected into the garbage storage pile through a gas injection device, and meanwhile, landfill gas in the garbage storage pile is pumped out through a gas extraction device; then detecting the methane concentration by a methane concentration detection device, and excavating the stored garbage after the detection is passed;
2) conveying the dug-out stored garbage to a drying system to reduce the water content of the stored garbage;
3) conveying the stored garbage processed by the airing system to a crushing device, and then conveying the garbage to a screening device to obtain oversize products and undersize products;
4) conveying undersize products of the screening device to a sorting device to obtain oversize products and undersize products; the undersize is humus soil;
5) conveying oversize materials of the screening device obtained in the step 3) and oversize materials of the sorting device obtained in the step 4) to a winnowing device to obtain heavy materials, medium materials and light materials;
6) and 5) conveying the medium substances obtained in the step 5) to a magnetic separation device to obtain oversize products and undersize products, wherein the undersize products are metal.
8. The method for screening and reducing the amount of garbage inventory of claim 7, wherein in the step 1), when the detected methane concentration is not more than 5%, the garbage inventory is excavated; when the detected methane concentration exceeds 5%, the inert gas injection and the landfill gas extraction are continued.
9. The method for screening and reducing the amount of garbage inventory as claimed in claim 7, wherein in the step 2), the moisture content of the garbage inventory treated by the air-drying system is 10 to 30%.
10. The method for screening and reducing inventory waste as set forth in claim 7, further comprising step 7): and (3) taking oversize products of the magnetic separation device obtained in the step 6) and light products of the air separation device obtained in the step 5) as combustible materials, and conveying the combustible materials to an incineration plant for incineration treatment.
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Application publication date: 20211102 |