CN114394717A - In-situ pollution control method for household garbage landfill - Google Patents

In-situ pollution control method for household garbage landfill Download PDF

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CN114394717A
CN114394717A CN202210004321.3A CN202210004321A CN114394717A CN 114394717 A CN114394717 A CN 114394717A CN 202210004321 A CN202210004321 A CN 202210004321A CN 114394717 A CN114394717 A CN 114394717A
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loess
percolate
leachate
pipe
water distribution
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CN114394717B (en
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胡泸丹
蒲红霞
张根升
魏新庆
彭浏湘
张旭晨
贺实月
薛剑凡
张蕾
王立彤
夏季
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Tianjin Jianchang Environmental Protection Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
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Abstract

The invention relates to an in-situ pollution control method for a household garbage landfill, which comprises the following steps: covering loess on the surface of the pile body; laying a percolate circulating irrigation pipeline system on the top of the loess cover; thirdly, laying a perforated aeration pipeline; installing an aeration fan; installing a circulating lift pump; sixthly, in-situ pollution control operation. The method has the advantages that the purpose of degrading the percolate in the landfill in the loess arid area can be achieved, the decrement of the percolate can be completed by utilizing the evaporation effect of the covering layer, and the effect that the percolate in the landfill is not discharged outside is finally realized; meanwhile, the odor discharged from the surface of the garbage pile body is adsorbed and degraded by the function of the biological reaction bed of the covering layer, so that the pollution intensity of the odor is reduced, and the aim of in-situ pollution control of the domestic garbage landfill in the loess area is fulfilled.

Description

In-situ pollution control method for household garbage landfill
Technical Field
The invention relates to the technical field of garbage landfill, in particular to an in-situ pollution control method for a household garbage landfill.
Background
The secondary pollutants of the domestic garbage landfill are mainly leachate and odor, and are also the main reasons for influencing the adjacency effect of the domestic garbage landfill. Generally, leachate needs to be treated in a centralized way through a leachate treatment plant, and the direct cost of treatment reaches 80-150 yuan/m3The method is also one of the important factors causing high operation cost of the landfill; the odor is the main factor of the air environment around the landfill site, and the traditional method of covering the membrane and assisting the medicament to deodorize is not ideal.
The loess geological area of China is about 635280 square kilometers, which accounts for about 4.9% of the total loess distribution area of the world and 6% of the land area of China. The loess area of China includes five provinces such as Shaanxi, Shanxi, Gansu, Ningxia and Qinghai, and the garbage disposal facilities below and in province counties of the loess area still take landfill as a main disposal means, and are mainly factors which are trapped in processing scale, economic level and management level. The landfill process is an effective means for treating the garbage and has strong operability.
The characteristics of the loess area enable the landfill technology to have relative advantages, which are as follows:
(1) land problems: in the loess region, due to loess hilly gully regions, broken landform, longitudinal and transverse gully, loose soil and water resource shortage, a lot of barren mountains are formed around counties and towns and can be utilized.
(2) Scale problem: the population density of the loess area is small, and the towns and towns are dispersed, so that the population of the towns and the towns is also dispersed, most of the towns and the towns are about 2 ten thousands of people, and daily-produced garbage is about 10-30 tons, so that the dispersed garbage can be subjected to high transportation cost by local governments if centralized incineration treatment is adopted.
(3) The characteristics of the garbage: the garbage in the area has the characteristics of low water content, low heat value and high inorganic ash content, and the characteristics of the garbage are also suitable for application of landfill technology.
(4) Rainfall: the meteorological characteristics in this region evaporation capacity is high, and the precipitation is few, and the evaporation capacity is greater than rainfall far away, and in such dry area, because the extra leachate that the rainfall produced is also less to the landfill, also very big reduction the landfill technique handle the high shortcoming of leachate output of rubbish.
(5) Financial capacity: the government financial capacity of the region is very limited, the financial income of the prefecture region GDP is lower than that of other provinces, and the government financial payment capacity is obviously insufficient; when selecting a garbage disposal technical route, the total cost of the garbage life cycle must be considered, and the total cost of the whole process of collection, transportation and disposal must be considered.
(6) The landfill technology comprises the following steps: the site selection period of the sanitary landfill site is short, the construction period is short, the total investment is low, the operation cost is low, the change applicability to the daily treatment entrance amount is strong, and meanwhile, the operation process is simple and the management and maintenance are easy.
Based on the analysis, the sanitary landfill technology of domestic garbage in China is not only the main mode of garbage disposal in the loess area at present, but also the first choice of the domestic garbage disposal technology in the loess area for a period of time in the future. This is also determined by the nature of the domestic waste and the economic development level of the area. The key factor for restricting the use of the landfill technology is the secondary pollution problem, so a set of domestic garbage sanitary landfill in-situ pollution control method suitable for the garbage characteristics and the regional characteristics of the region needs to be established.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides an in-situ pollution control method for a domestic garbage landfill, which is mainly used for treating odor and leachate in the in-situ domestic garbage landfill in areas with large evaporation capacity and small rainfall capacity, so as to reduce and treat the leachate in the landfill and reduce the odor pollution intensity. The invention is used for the landfill site for completing partial landfill.
In order to achieve the purpose, the invention adopts the following technical scheme: an in-situ pollution control method for a household garbage landfill site comprises the following steps:
covering loess on the surface of the pile
Leveling and compacting the garbage pile, then paving loess and compacting loess, wherein the height is 30-50cm, the loose paving thickness is not more than 30cm each time, and paving a loess covering layer; in the loess area, the loess resource is very abundant, and the advantage of adopting the loess as the overburden is that the expense is low, and its natural water content is between 3 ~ 26% in addition, and the water-holding capacity is relatively poor, is fit for doing and irrigates the overburden.
Second, the loess covers the top and lays the percolate circulation irrigation pipe system
After the top loess covering layer is laid, laying a percolate circulating irrigation pipeline system in a secondary grooving mode, and firstly performing secondary grooving, wherein a rectangular section or a trapezoidal section can be adopted; after the grooving is finished, 200g/m is used2Laying the bottom of the geotechnical filter screen; then paving a gravel cushion layer inside the steel pipe, wherein the grain diameter of gravel is between 20 and 50 cm; then paving a water distribution branch pipe for leachate circulation on the gravel cushion, wherein the top soil covering thickness of the water distribution branch pipe is controlled to be 10-20mm, the diameter phi of an opening of a perforated pipe is 8mm, the opening area is in a downward 90-degree arc range, and the opening rate in the area is 5% -7%; then, filling gravels on two sides of the water distribution branch pipe, grading the gravels to be the same as the cushion layer, and enabling the top of the gravels to be flush with the loess layer; then, 200g of a geotechnical filter screen is used for completely wrapping the upper part, and the distance between the water distribution branch pipes is controlled to be 3-6 m; the water distribution branch pipe is connected with the percolate circulation main pipe, and the water distribution branch pipe is connected with the percolate circulation main pipeThe water distribution pipes are communicated with each other through water distribution pipes, and control gate valves are arranged on the water distribution pipes;
thirdly, laying perforated aeration pipeline
An air pipeline is laid in the percolate adjusting tank and used as a perforated aeration pipe, ammonia nitrogen in the percolate can be converted into nitrate nitrogen, and denitrification can be further carried out in the environment of the next garbage pile; the air pipeline adopts a perforated pipe mode, the distance between aeration pipes is determined to be 1.0-3.0m according to aeration quantity, and the pipe diameter is DN40-DN80 mm;
installing aeration fan
The air source of the perforated aeration pipe of the percolate adjusting tank is provided by a configured blower, and the aeration rate is controlled to be 2-5m according to the total water amount of percolate in the percolate adjusting tank3/m2Supply of min; the perforated aeration pipe in the percolate adjusting tank is connected to a blower by an air pipeline; the blower operates according to an intermittent air supply mode, and the ratio of ammonia nitrogen to total nitrogen in the percolate adjusting tank is controlled to be less than 0.5; if the ammonia nitrogen/total nitrogen ratio in the regulating tank is less than 0.5, the air blower can be shut down, the percolate in the regulating tank is ensured to be in the state of oxygen deficiency aeration, and the operating cost can be saved.
Installing circulating lift pump
The installation of the leachate irrigation circulating lift pump in the leachate adjusting tank can adopt the form of an in-tank submersible pump or a self-sucking pump installed in a dry type on the shore, the circulating lift pump adopts an intermittent operation mode, operates for 1-3 times every day and is controlled by the irrigation quantity every day, and the irrigation quantity is controlled at 5-15mm/m2(ii) a A circulating lift pump for irrigating the percolate is connected with a water distribution branch pipe laid on the top of the loess cover through a percolate circulating main pipe;
in-situ pollution control operation
The leachate in the leachate regulating reservoir is pre-aerated, and is lifted by a circulating lift pump, and a water distribution branch pipe is laid on the top of the loess cover to be circularly refilled into the garbage heap body, the leachate is biochemically degraded by taking the garbage heap body as a carrier, and is finally collected by a leachate guide and discharge pipe at the bottom of the garbage heap body, and the leachate is discharged into the leachate regulating reservoir through a leachate discharge pipe connected with the leachate guide and discharge pipe.
The invention has the beneficial effects that: the method has the advantages that the purpose of degrading the percolate in the landfill in the loess arid area can be achieved, the decrement of the percolate can be completed by utilizing the evaporation effect of the covering layer, and the effect that the percolate in the landfill is not discharged outside is finally realized; meanwhile, the odor discharged from the surface of the garbage pile body is adsorbed and degraded by the function of the biological reaction bed of the covering layer, so that the pollution intensity of the odor is reduced, and the aim of in-situ pollution control of the domestic garbage landfill in the loess area is fulfilled. The invention reduces the treatment cost of the percolate, further reduces the operation cost of a landfill, reduces the pollution intensity of the odor and reduces the difficulty and the cost of the treatment of the secondary pollution of the odor.
Drawings
FIG. 1 is a control flow diagram of the present invention;
FIG. 2 is a schematic structural view of the present invention;
in the figure: 1-garbage dump; 2-loess cover sheet; 3-water distribution branch pipe; 4-leachate circulation main pipe; 5-perforating aeration pipes; 6-a blower; 7-leachate guide and discharge pipe; 8-circulating lift pump; 9-leachate adjusting tank; 10-leachate discharge pipe;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 to 2, an in-situ pollution control method for a domestic garbage landfill comprises the following steps:
covering loess on the surface of the pile
Leveling and compacting the garbage pile 1, then paving loess and compacting loess, wherein the height is 30-50cm, the loose paving thickness is not more than 30cm each time, and paving the loess covering layer 2; in the loess area, the loess resource is very abundant, and the advantage of adopting the loess as the overburden is that the expense is low, and its natural water content is between 3 ~ 26% in addition, and the water-holding capacity is relatively poor, is fit for doing and irrigates the overburden.
Second, the loess covers the top and lays the percolate circulation irrigation pipe system
After the top loess covering layer 2 is laid, a leachate circulating irrigation pipeline system is laid in a secondary grooving mode, secondary grooving is firstly carried out, and a rectangular section or a trapezoidal section can be adopted; after the grooving is finished, 200g/m is used2Laying the bottom of the geotechnical filter screen; then paving a gravel cushion layer inside the steel pipe, wherein the grain diameter of gravel is between 20 and 50 cm; then, paving a water distribution branch pipe 3 for leachate circulation on the gravel cushion, controlling the top earthing thickness of the pipe of the water distribution branch pipe 3 to be 10-20mm, controlling the diameter phi of an opening of a perforated pipe to be 8mm, controlling the opening area to be within a downward 90-degree arc range, and controlling the opening rate in the area to be 5% -7%; then, filling gravels on two sides of the water distribution branch pipe 3, grading the gravels to be the same as the cushion layer, and leveling the top of the gravels to be a loess layer; then, 200g of a geotechnical filter screen is used for completely wrapping the upper part, and the distance between the water distribution branch pipes 3 is controlled to be 3-6 m; the water distribution branch pipe 3 is connected with the percolate circulation main pipe 4, the water distribution branch pipe 3 is communicated with the percolate circulation main pipe 4 through a water distribution pipeline, and a control gate valve is arranged on the water distribution pipeline;
thirdly, laying perforated aeration pipeline
An air pipeline is laid in the percolate adjusting tank 9 and used as a perforated aeration pipe 5, ammonia nitrogen in percolate can be converted into nitrate nitrogen, and further denitrification can be carried out in the environment of the garbage heap 1 in the next step; the air pipeline adopts a perforated pipe mode, the distance between aeration pipes is determined to be 1.0-3.0m according to aeration quantity, and the pipe diameter is DN40-DN80 mm;
installing aeration fan
The air source of the perforated aeration pipe 5 of the percolate adjusting tank 9 is provided by a configured blower 6, and the aeration rate is controlled to be 2-5m according to the total water amount of percolate in the percolate adjusting tank 93/m2Supply of min; the perforated aeration pipe 5 in the percolate adjusting tank 9 is connected to a blower 6 by an air pipeline; the blower 6 operates according to an intermittent air supply mode, and the ratio of ammonia nitrogen to total nitrogen in the percolate adjusting tank 9 is controlled to be less than 0.5; if the ammonia nitrogen/total nitrogen ratio in the regulating tank is less than 0.5, the air blower can be shut down, the percolate in the regulating tank is ensured to be in the state of oxygen deficiency aeration, and the operating cost can be saved.
Installing circulating lift pump
The installation of the leachate irrigation circulating lift pump 8 in the leachate adjusting tank 9 can adopt the form of an in-tank submersible pump or a self-sucking pump installed in a dry type on the bank, the circulating lift pump 8 adopts an intermittent operation mode, operates for 1-3 times every day and is controlled by the irrigation quantity every day, and the irrigation quantity is controlled at 5-15mm/m2(ii) a A circulation lift pump 8 for irrigating percolate is connected with the loess covering top laying water distribution branch pipe 3 through a percolate circulation main pipe 4;
in-situ pollution control operation
The leachate in the leachate regulating reservoir 9 is pre-aerated, is lifted by a circulating lift pump 8, is laid with a water distribution branch pipe 3 at the top of the loess cover and is circularly refilled into the garbage heap body 1, and the leachate is biochemically degraded by taking the garbage heap body 1 as a carrier, is finally collected by a leachate guide and exhaust pipe 7 at the bottom of the garbage heap body 1, and is discharged into the leachate regulating reservoir 9 through a leachate discharge pipe 10 connected with the leachate guide and exhaust pipe 7.
The invention utilizes the characteristic of water retention of the loess covering layer 2, irrigates on the subsurface layer of the loess covering layer 2, the loess covering layer 2 continuously reduces the total amount of the percolate through the transpiration, the percolate can be reduced by 10 to 30 percent on the basis of the recharge amount through the transpiration, and the percolate can not be discharged outside the landfill site on the basis of ensuring a certain covering area by adjusting the circulating flow of the percolate, thereby greatly reducing the professional management difficulty of percolate treatment and greatly reducing the overall operation cost of the landfill site;
according to the invention, through leachate circulation, the loess covering layer 2 is gradually changed into a biological covering layer with a biological reaction bed function, and through adsorption, conversion and biodegradation, the source strength of odor released by the garbage heap body 1 (landfill body) is reduced, the strength of inorganically released odor of a landfill is improved, the treatment cost and difficulty of the odor of the landfill are reduced, and the environmental protection benefit is improved;
according to the operation method, the dissolved oxygen content in the leachate can be increased by performing pre-aeration treatment in the leachate adjusting tank 9, ammonia nitrogen in the leachate is converted into nitrate nitrogen in the leachate adjusting tank 9 and the garbage heap 1 adjacent to the lower part of the leachate circulating main pipe 4, then the nitrate nitrogen is converted into nitrogen gas under the action of denitrifying bacteria in an anoxic environment continuously infiltrating into the deep part of the garbage heap 1, then the ammonia nitrogen and the total nitrogen are reduced, and finally the ammonia nitrogen and the total nitrogen pollutants are removed from the interior of the in-situ garbage heap 1 by increasing the number of times of circulation of the leachate;
according to the invention, the amount of the percolate is reduced through the evaporation effect, and the pollutant intensity is reduced through a biological reaction, so that other problems caused by the increase of the pollution concentration after the evaporation reduction of the percolate are avoided. By regulating and controlling the cycle times and the cycle strength of the leachate, the purpose of non-outward treatment while reducing leachate pollutants can be finally achieved; the invention can realize that the concentration of methane on the surface of the covering layer of the landfill body is less than 3 percent.
Example 1
An in-situ pollution control method for a household garbage landfill site comprises the following steps:
covering loess on the surface of the pile
Leveling and compacting the garbage pile 1, then paving loess and compacting loess, wherein the height is 30cm, the loose paving thickness is not more than 30cm each time, and paving the loess covering layer 2; in the loess area, the loess resource is very abundant, and the advantage of adopting the loess as the overburden is that the expense is low, and its natural water content is between 3 ~ 26% in addition, and the water-holding capacity is relatively poor, is fit for doing and irrigates the overburden.
Second, the loess covers the top and lays the percolate circulation irrigation pipe system
After the top loess covering layer 2 is laid, a leachate circulating irrigation pipeline system is laid in a secondary grooving mode, secondary grooving is firstly carried out, and a rectangular section or a trapezoidal section can be adopted; after the grooving is finished, 200g/m is used2Laying the bottom of the geotechnical filter screen; then paving a gravel cushion layer inside the steel pipe, wherein the grain diameter of gravel is 20 cm; then, paving a water distribution branch pipe 3 for leachate circulation on the gravel cushion, wherein the top soil covering thickness of the water distribution branch pipe 3 is 10mm, the opening diameter phi of a perforated pipe is 8mm, the opening area is in a downward 90-degree arc range, and the opening rate in the area is 5%; then, filling gravels on two sides of the water distribution branch pipe 3, grading the gravels to be the same as the cushion layer, and leveling the top of the gravels to be a loess layer; then the upper part is completely wrapped by 200g of geotechnical filter screenThe distance between the water distribution branch pipes 3 is controlled to be 3 m; the water distribution branch pipe 3 is connected with the percolate circulation main pipe 4, the water distribution branch pipe 3 is communicated with the percolate circulation main pipe 4 through a water distribution pipeline, and a control gate valve is arranged on the water distribution pipeline;
thirdly, laying perforated aeration pipeline
An air pipeline is laid in the percolate adjusting tank 9 and used as a perforated aeration pipe 5, ammonia nitrogen in percolate can be converted into nitrate nitrogen, and further denitrification can be carried out in the environment of the garbage heap 1 in the next step; the air pipeline adopts a perforated pipe mode, the distance between aeration pipes is 1.0m according to aeration quantity, and the pipe diameter is DN40 mm;
installing aeration fan
The air source of the perforated aeration pipe 5 of the percolate adjusting tank 9 is provided by a configured blower 6, and the aeration rate is controlled to be 2m according to the total water amount of percolate in the percolate adjusting tank 93/m2Supply of min; the perforated aeration pipe 5 in the percolate adjusting tank 9 is connected to a blower 6 by an air pipeline; the blower 6 operates according to an intermittent air supply mode, and the ratio of ammonia nitrogen to total nitrogen in the percolate adjusting tank 9 is controlled to be less than 0.5; if the ammonia nitrogen/total nitrogen ratio in the regulating tank is less than 0.5, the air blower can be shut down, the percolate in the regulating tank is ensured to be in the state of oxygen deficiency aeration, and the operating cost can be saved.
Installing circulating lift pump
Install filtration liquid at filtration liquid equalizing basin 9 and irrigate with circulation lift pump 8 and can take the self priming pump form of immersible pump form in the pond or bank dry-type installation, circulation lift pump 8 adopts intermittent operation's mode, operates 1 time every day, is controlled by the irrigation volume of every day, and the irrigation volume is 5mm/m2(ii) a A circulation lift pump 8 for irrigating percolate is connected with the loess covering top laying water distribution branch pipe 3 through a percolate circulation main pipe 4;
in-situ pollution control operation
The leachate in the leachate regulating reservoir 9 is pre-aerated, is lifted by a circulating lift pump 8, is laid with a water distribution branch pipe 3 at the top of the loess cover and is circularly refilled into the garbage heap body 1, and the leachate is biochemically degraded by taking the garbage heap body 1 as a carrier, is finally collected by a leachate guide and exhaust pipe 7 at the bottom of the garbage heap body 1, and is discharged into the leachate regulating reservoir 9 through a leachate discharge pipe 10 connected with the leachate guide and exhaust pipe 7.
Example 2
An in-situ pollution control method for a household garbage landfill site comprises the following steps:
covering loess on the surface of the pile
Leveling and compacting the garbage pile 1, then paving loess and compacting loess, wherein the height is 50cm, the loose paving thickness is not more than 30cm each time, and paving the loess covering layer 2; in the loess area, the loess resource is very abundant, and the advantage of adopting the loess as the overburden is that the expense is low, and its natural water content is between 3 ~ 26% in addition, and the water-holding capacity is relatively poor, is fit for doing and irrigates the overburden.
Second, the loess covers the top and lays the percolate circulation irrigation pipe system
After the top loess covering layer 2 is laid, a leachate circulating irrigation pipeline system is laid in a secondary grooving mode, secondary grooving is firstly carried out, and a rectangular section or a trapezoidal section can be adopted; after the grooving is finished, 200g/m is used2Laying the bottom of the geotechnical filter screen; then paving a gravel cushion layer in the inner part, wherein the particle size of gravel is 50 cm; then, paving a water distribution branch pipe 3 for leachate circulation on the gravel cushion, wherein the top soil covering thickness of the water distribution branch pipe 3 is 20mm, the opening diameter phi of a perforated pipe is 8mm, the opening area is in a downward 90-degree arc range, and the opening rate in the area is 7%; then, filling gravels on two sides of the water distribution branch pipe 3, grading the gravels to be the same as the cushion layer, and leveling the top of the gravels to be a loess layer; then, 200g of a geotechnical filter screen is used for completely wrapping the upper part, and the distance between the water distribution branch pipes 3 is 6 m; the water distribution branch pipe 3 is connected with the percolate circulation main pipe 4, the water distribution branch pipe 3 is communicated with the percolate circulation main pipe 4 through a water distribution pipeline, and a control gate valve is arranged on the water distribution pipeline;
thirdly, laying perforated aeration pipeline
An air pipeline is laid in the percolate adjusting tank 9 and used as a perforated aeration pipe 5, ammonia nitrogen in percolate can be converted into nitrate nitrogen, and further denitrification can be carried out in the environment of the garbage heap 1 in the next step; the air pipeline adopts a perforated pipe mode, the distance between the aeration pipes is 3.0m according to the aeration quantity, and the pipe diameter is DN80 mm;
installing aeration fan
The air source of the perforated aeration pipe 5 of the percolate adjusting tank 9 is provided by a configured blower 6, and the aeration rate is controlled to be 5m according to the total water amount of percolate in the percolate adjusting tank 93/m2Supply of min; the perforated aeration pipe 5 in the percolate adjusting tank 9 is connected to a blower 6 by an air pipeline; the blower 6 operates according to an intermittent air supply mode, and the ratio of ammonia nitrogen to total nitrogen in the percolate adjusting tank 9 is controlled to be less than 0.5; if the ammonia nitrogen/total nitrogen ratio in the regulating tank is less than 0.5, the air blower can be shut down, the percolate in the regulating tank is ensured to be in the state of oxygen deficiency aeration, and the operating cost can be saved.
Installing circulating lift pump
Install filtration liquid irrigation at filtration liquid equalizing basin 9 and can take the self priming pump form of immersible pump form or bank dry-type installation in the pond with circulation lift pump 8, circulation lift pump 8 adopts the mode of intermittent type operation, moves 3 times every day, is controlled by the irrigation volume of every day, and the irrigation volume is 15mm/m2(ii) a A circulation lift pump 8 for irrigating percolate is connected with the loess covering top laying water distribution branch pipe 3 through a percolate circulation main pipe 4;
in-situ pollution control operation
The leachate in the leachate regulating reservoir 9 is pre-aerated, is lifted by a circulating lift pump 8, is laid with a water distribution branch pipe 3 at the top of the loess cover and is circularly refilled into the garbage heap body 1, and the leachate is biochemically degraded by taking the garbage heap body 1 as a carrier, is finally collected by a leachate guide and exhaust pipe 7 at the bottom of the garbage heap body 1, and is discharged into the leachate regulating reservoir 9 through a leachate discharge pipe 10 connected with the leachate guide and exhaust pipe 7.
Example 3
An in-situ pollution control method for a household garbage landfill site comprises the following steps:
covering loess on the surface of the pile
Leveling and compacting the garbage pile 1, then paving loess and compacting loess, wherein the height is 45cm, the loose paving thickness is not more than 30cm each time, and paving the loess covering layer 2; in the loess area, the loess resource is very abundant, and the advantage of adopting the loess as the overburden is that the expense is low, and its natural water content is between 3 ~ 26% in addition, and the water-holding capacity is relatively poor, is fit for doing and irrigates the overburden.
Second, the loess covers the top and lays the percolate circulation irrigation pipe system
After the top loess covering layer 2 is laid, a leachate circulating irrigation pipeline system is laid in a secondary grooving mode, secondary grooving is firstly carried out, and a rectangular section or a trapezoidal section can be adopted; after the grooving is finished, 200g/m is used2Laying the bottom of the geotechnical filter screen; then paving a gravel cushion layer in the inner part, wherein the particle size of gravel is 40 cm; then, paving a water distribution branch pipe 3 for leachate circulation on the gravel cushion, wherein the top soil covering thickness of the water distribution branch pipe 3 is 15mm, the opening diameter phi of a perforated pipe is 8mm, the opening area is in a downward 90-degree arc range, and the opening rate in the area is 6%; then, filling gravels on two sides of the water distribution branch pipe 3, grading the gravels to be the same as the cushion layer, and leveling the top of the gravels to be a loess layer; then, 200g of a geotechnical filter screen is used for completely wrapping the upper part, and the distance between the water distribution branch pipes 3 is 5 m; the water distribution branch pipe 3 is connected with the percolate circulation main pipe 4, the water distribution branch pipe 3 is communicated with the percolate circulation main pipe 4 through a water distribution pipeline, and a control gate valve is arranged on the water distribution pipeline;
thirdly, laying perforated aeration pipeline
An air pipeline is laid in the percolate adjusting tank 9 and used as a perforated aeration pipe 5, ammonia nitrogen in percolate can be converted into nitrate nitrogen, and further denitrification can be carried out in the environment of the garbage heap 1 in the next step; the air pipeline adopts a perforated pipe mode, the distance between the aeration pipes is 2m according to the aeration quantity, and the pipe diameter is DN60 mm;
installing aeration fan
The air source of the perforated aeration pipe 5 of the percolate adjusting tank 9 is provided by a configured blower 6, and the aeration rate is controlled to be 4m according to the total water amount of percolate in the percolate adjusting tank 93/m2Supply of min; the perforated aeration pipe 5 in the percolate adjusting tank 9 is connected to a blower 6 by an air pipeline; the blower 6 operates according to an intermittent air supply mode, and the ratio of ammonia nitrogen to total nitrogen in the percolate adjusting tank 9 is controlled to be less than 0.5;if the ammonia nitrogen/total nitrogen ratio in the regulating tank is less than 0.5, the air blower can be shut down, the percolate in the regulating tank is ensured to be in the state of oxygen deficiency aeration, and the operating cost can be saved.
Installing circulating lift pump
Install filtration liquid irrigation at filtration liquid equalizing basin 9 and can take the form of immersible pump in the pond or the self priming pump form of dry-type installation on the bank, circulation lift pump 8 adopts the mode of intermittent operation, moves 2 times every day, is controlled by the irrigation volume of every day, and irrigation volume control is at 10mm/m2(ii) a A circulation lift pump 8 for irrigating percolate is connected with the loess covering top laying water distribution branch pipe 3 through a percolate circulation main pipe 4;
in-situ pollution control operation
The leachate in the leachate regulating reservoir 9 is pre-aerated, is lifted by a circulating lift pump 8, is laid with a water distribution branch pipe 3 at the top of the loess cover and is circularly refilled into the garbage heap body 1, and the leachate is biochemically degraded by taking the garbage heap body 1 as a carrier, is finally collected by a leachate guide and exhaust pipe 7 at the bottom of the garbage heap body 1, and is discharged into the leachate regulating reservoir 9 through a leachate discharge pipe 10 connected with the leachate guide and exhaust pipe 7.
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, adaptations or uses of the invention, and all such modifications and variations are within the scope of the invention.

Claims (8)

1. An in-situ pollution control method for a domestic garbage landfill is characterized by comprising the following steps,
covering loess on the surface of the pile
Leveling and compacting the garbage pile body (1), then paving loess and compacting loess, wherein the height of the loess and compacted loess is 30-50cm, and finishing the paving of the loess covering layer (2);
second, the loess covers the top and lays the percolate circulation irrigation pipe system
After the top loess covering layer (2) is laid, the top loess covering layer is applied in a secondary grooving modeA leachate circulating irrigation pipeline system is arranged, secondary grooving is firstly carried out, and 200g/m is used after the grooving is finished2Laying the bottom of the geotechnical filter screen; then paving a gravel cushion layer inside the steel pipe, wherein the grain diameter of gravel is between 20 and 50 cm; then paving a water distribution branch pipe (3) for leachate circulation on the gravel cushion, and backfilling gravel on two sides of the water distribution branch pipe (3), wherein the gravel is graded and matched with the cushion, and the top of the gravel is flush with a loess layer; then, 200g of a geotechnical filter screen is used for completely wrapping the upper part, and the distance between the water distribution branch pipes (3) is controlled to be 3-6 m; the water distribution branch pipe (3) is connected with the percolate circulation main pipe (4), the water distribution branch pipe (3) is communicated with the percolate circulation main pipe (4) through a water distribution pipeline, and a control gate valve is arranged on the water distribution pipeline;
thirdly, laying perforated aeration pipeline
An air pipeline is laid in the percolate adjusting tank (9) and used as a perforated aeration pipe (5) to convert ammonia nitrogen in percolate into nitrate nitrogen, and then denitrification can be carried out in the environment of the garbage heap body (1) in the next step;
installing aeration fan
The air source of the perforated aeration pipe (5) of the percolate adjusting tank (9) is provided by a configured blower (6), and the aeration rate is controlled to be 2-5m according to the total water amount of percolate in the percolate adjusting tank (9)3/m2Supply of min; the perforated aeration pipe (5) in the percolate adjusting tank (9) is connected to a blower (6) by an air pipeline;
installing circulating lift pump
A leachate irrigation circulating lift pump (8) is installed in the leachate adjusting tank (9), and the leachate irrigation circulating lift pump (8) is connected with the loess covering top laying water distribution branch pipe (3) through a leachate circulating main pipe (4);
in-situ pollution control operation
The leachate in the leachate regulating reservoir (9) is pre-aerated, and is lifted by a circulating lift pump (8) to be circularly refilled into the garbage heap body (1) by laying a water distribution branch pipe (3) on the top of the loess cover, the leachate is biochemically degraded by taking the garbage heap body (1) as a carrier, is finally collected by a leachate guide and discharge pipe (7) at the bottom of the garbage heap body (1), and is discharged into the leachate regulating reservoir (9) by a leachate discharge pipe (10) connected with the leachate guide and discharge pipe (7).
2. The in-situ pollution control method for the municipal solid waste landfill according to claim 1, wherein in step (i), the loess covering layer (2) is not more than 30cm thick each time.
3. The in-situ pollution control method for the domestic garbage landfill according to claim 1, wherein in the second step, the cross section of the secondary slot for laying the water distribution branch pipe (3) is rectangular or trapezoidal.
4. The in-situ pollution control method for the domestic garbage landfill site as claimed in claim 1, wherein in the third step, the air pipeline is in a perforated pipe mode, the size of the pipeline is determined according to the aeration rate that the distance between the aeration pipes is 1.0-3.0m, and the pipe diameter is DN40-DN80 mm.
5. The in-situ pollution control method for the household garbage landfill according to claim 1, wherein in the step (iv), the blower (6) operates in an intermittent air supply mode, and the ammonia nitrogen/total nitrogen ratio in the percolate adjusting tank (9) is controlled to be less than 0.5.
6. The in-situ pollution control method for the domestic waste landfill according to claim 1, wherein in the fifth step, the circulation lift pump (8) can take the form of an in-tank submersible pump or an onshore dry self-priming pump.
7. The in-situ pollution control method for the domestic waste landfill according to claim 6, wherein the circulation lift pump (8) is operated 1-3 times a day in an intermittent operation mode, and is controlled by the irrigation amount per day, and the irrigation amount is controlled to be 5-15mm/m2。
8. The in-situ pollution control method for the domestic garbage landfill site as claimed in claim 3, wherein in the second step, the top soil covering thickness of the tubes on the water distribution branch tubes (3) is controlled to be 10-20mm, the diameter of the holes of the perforated tubes is phi 8mm, the hole area is in the range of downward 90 degrees arc, and the hole opening rate in the area is 5% -7%.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060222464A1 (en) * 2005-04-05 2006-10-05 Casella Waste Systems, Inc. Aerobic and anaerobic waste management systems and methods for landfills
CN209522653U (en) * 2018-12-30 2019-10-22 武汉景弘生态环境股份有限公司 A kind of refuse landfill and oxygen repair system
CN111112275A (en) * 2019-11-27 2020-05-08 同济大学 Sanitary landfill covering method for domestic garbage in loess area
CN111675433A (en) * 2020-06-16 2020-09-18 兰州大学 Ecological strengthening treatment method for landfill leachate in northwest loess area

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060222464A1 (en) * 2005-04-05 2006-10-05 Casella Waste Systems, Inc. Aerobic and anaerobic waste management systems and methods for landfills
CN209522653U (en) * 2018-12-30 2019-10-22 武汉景弘生态环境股份有限公司 A kind of refuse landfill and oxygen repair system
CN111112275A (en) * 2019-11-27 2020-05-08 同济大学 Sanitary landfill covering method for domestic garbage in loess area
CN111675433A (en) * 2020-06-16 2020-09-18 兰州大学 Ecological strengthening treatment method for landfill leachate in northwest loess area

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