CN109847557A - Refuse landfill gas barrier arragement construction and blocking method - Google Patents
Refuse landfill gas barrier arragement construction and blocking method Download PDFInfo
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- CN109847557A CN109847557A CN201811547689.4A CN201811547689A CN109847557A CN 109847557 A CN109847557 A CN 109847557A CN 201811547689 A CN201811547689 A CN 201811547689A CN 109847557 A CN109847557 A CN 109847557A
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Abstract
The invention belongs to environmental geotechnical field more particularly to a kind of refuse landfill gas barrier arragement construction and blocking methods.The barrier arragement construction includes extraction well and gas injection well, and extraction well is provided with multiple, and multiple extraction wells are in first straight line, and gas injection well is also equipped with multiple, and multiple gas injection wells are in second straight line, and first straight line and first straight line are successively arranged far from cleaning area.The blocking method includes: that extraction well and gas injection well are arranged on junk-heap body on the outside of cleaning area.Air is injected into junk-heap body using gas injection well, methane is drawn by extraction well to extraction well in the air and cleaning area of injection, and the oxygen in air is chemically reacted with methane, to reduce the methane in cleaning area.The present invention has the characteristics that construction technology is simple, time-consuming short, at low cost and easy to maintain.
Description
Technical field
The invention belongs to environmental geotechnical field more particularly to a kind of refuse landfill with gas barrier arragement construction with
And blocking method.
Background technique
With the continuous quickening of Urbanization in China, domestic waste yield rises year by year, the clothes of refuse landfill
The labour time limit is also gradually shortened.Rubbish generates two kinds of main pollutants after landfill --- biogas and Leachate site.Biogas be methane,
The mixture of the gases such as carbon dioxide, hydrogen sulfide, Leachate site are the waste liquids of the high concentration generated by degradation, contain a huge sum of money
Belong to, organic and high salt.Since Design of Waste Landfill Site plans the contradiction with operation, landfill yard is caused to go out during longtime running
Show different degrees of contamination accident and operation new demand therefore to repair the junk-heap body partially filled, change
The cleaning works such as build or remove.
During cleaning work carries out, the methane concentration of working face requires to be lower than 5%, otherwise easily cause fire and
The safety accidents such as explosion.When the rubbish of landfill in cleaning area still has degradation capability, main component of the methane as biogas
It will persistently generate, and be migrated to low pressure regions or atmospheric pressure direction.It, must in order to ensure the safety and efficient operation of cleaning work
Gas in junk-heap body other than non-cleaning area must be collected or be handled, avoided the methane of non-cleaning area from penetrating into and open
Dig area and place cleaning.
Since good Zoning landfill is not carried out in China's overwhelming majority refuse landfill, and often cleaning work mainly collects
In a part or sub-fraction region in.Good barrier is not built between the region and non-cleaning area being cleaned to set
Under conditions of applying, the gas between two regions is easy to interpenetrate, easily the initiation safety accidents such as fire or explosion.
In addition, since junk-heap body has the characteristics that hole is larger, be unevenly distributed and cohesive strength is lower, traditional ground
The more difficult implementation of the methods of slip casting, solidification in engineering.When the heap body of cleaning is deeper, using vertical seepage control film not only construction cost
High and low efficiency, while the stability of excavation face is also difficult to ensure.
Therefore, design it is a kind of with simple process, excellent effect and low-cost new gas blocking method, for
The smooth cleaning of junk-heap body has important practical significance.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of refuse landfill gas barrier arragement constructions
And method, with simple and effective, safe and inexpensive clear up junk-heap body.
The present invention through the following technical solutions to achieve the above objectives:
On the one hand, the invention discloses a kind of refuse landfill gas barrier arragement construction, the barrier arragement constructions
Including extraction well and gas injection well, in which:
The extraction well is provided with multiple, and multiple extraction wells are in first straight line；
The gas injection well is also equipped with multiple, and multiple gas injection wells are in second straight line；
The first straight line and the first straight line are successively arranged far from cleaning area.
Further, it is straight to be equal to or less than described first for the distance between the first straight line and the cleaning area boundary
The distance between line and the second straight line.
Further, the distance between the first straight line and the cleaning area boundary, the first straight line and described
The distance between second straight line is no more than 10m.
Further, the gas injection well interlaced arrangement on the extraction well and the second straight line in the first straight line.
Further, in an extraction well in the first straight line and the second straight line with one extraction well
Two adjacent gas injection wells, arrangement in equilateral triangle, such extraction well are best to the extraction effect of methane and air.
Further, there are three monitoring wells for spaced set between two extraction wells adjacent in the first straight line, often
It is provided with gas concentration detector in a monitoring well, with real-time detection extraction well treated gas concentration.
It further, further include multiple first branch pipes and first general pipeline, first branch pipe and the extraction well pair
Should be arranged, the upper end of one end of first branch pipe and the corresponding extraction well is connected to, multiple first branch pipes it is another
On first general pipeline, first general pipeline is connected to the first blower for end connection.
It further, further include multiple second branch pipes and second general pipeline, second branch pipe and the gas injection well pair
Should be arranged, the upper end of one end of second branch pipe and the corresponding gas injection well is connected to, multiple second branch pipes it is another
On second general pipeline, second general pipeline is connected to the second blower for end connection.
On the other hand, the invention also discloses another refuse landfill gas barrier arragement construction, the barrier cloth
Setting structure includes extraction well and gas injection well, in which:
The extraction well is provided with multiple, and multiple extraction wells are on first lap；
The gas injection well be also equipped with it is multiple, multiple gas injection wells be in second circle on；
The first lap setting is between second circle and cleaning area.
In addition, the method is to utilize above-mentioned resistance the invention also discloses a kind of refuse landfill gas barrier method
It is carried out every arragement construction, which comprises
Extraction well and gas injection well are arranged on the junk-heap body on the outside of cleaning area；
Air is injected into junk-heap body using gas injection well, methane passes through extraction well in the air and cleaning area of injection
It draws the oxygen to extraction well, in air to chemically react with methane, to reduce the methane in cleaning area.
The beneficial effects of the present invention are:
A kind of refuse landfill gas barrier arragement construction and blocking method provided by the present invention utilize gas injection
Well injects air into junk-heap body, and the oxygen in air is chemically reacted with methane, to reduce the methane in cleaning area
, the gases such as remaining oxygen, methane and nitrogen flow into extraction well under the negative pressure of extraction well, and are discharged by extraction well,
To ensure that carrying out the gases such as the methane in work progress other than cleaning area in cleaning area does not flow into cleaning area, improves clear
Manage the safety that regional work carries out, since gas injection well and extraction well can carry out flexible design according to the landform of landfill yard, not by
The influence of orographic condition, and gas injection well and extraction well are reusable, will not cause secondary pollution to landfill yard place, have
The feature that construction technology is simple, time-consuming is short, at low cost and easy to maintain.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of schematic diagram of refuse landfill gas barrier arragement construction of the embodiment of the present invention；
Fig. 2 is the schematic top plan view of Fig. 1；
Fig. 3 is the arrangement schematic diagram of monitoring well；
Fig. 4 is the pipeline arrangement schematic diagram of extraction well in the embodiment of the present invention；
Fig. 5 is the pipeline arrangement schematic diagram of gas injection well in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of schematic diagram of refuse landfill gas barrier arragement construction of the embodiment of the present invention, Fig. 2 Fig. 1
Schematic top plan view, in conjunction with Fig. 1 and Fig. 2, which includes extraction well 2 and gas injection well 3, wherein extraction well 2 is set
It is equipped with multiple, multiple extraction wells 2 are in first straight line；Gas injection well 3 is also equipped with multiple, and it is straight that multiple gas injection wells 3 are in second
On line, first straight line and first straight line are successively arranged far from cleaning area 1.
The setting of extraction well 2, can be by the portion of methane in cleaning area 1 and close to cleaning area 1 in 1 periphery of cleaning area
Interior methane is collected and controls, so that the methane of non-cleaning area collects to greatest extent, prevents methane from flowing into clear
Manage region.
The setting of gas injection well 3 is in 2 periphery of extraction well, the methane hair after injecting air, around the oxygen and gas injection well 3 in air
Biochemical reaction achievees the purpose that reduce methane, while the methane for being also possible to prevent higher concentration flows into extraction well 2, prevents
The methane and oxygen collected in extraction well 2 are mixed explosion accident.
In the embodiment of the present invention, the distance between 1 boundary of first straight line and cleaning area be equal to or less than first straight line and
The distance between second straight line, and the distance is usually no more than 10m, can reduce the operation intensity of blower in this way, saves operation
Cost.
Further, in the embodiment of the present invention, the extraction well 2 in first straight line and the gas injection well in second straight line 3 are best
Interlaced arrangement, it is preferable that two gas injections adjacent with the extraction well 2 on the extraction well 2 and second straight line in first straight line
Well 3, arrangement in equilateral triangle, the gas that this distribution method can be controlled to greatest extent in 2 near zone of extraction well pass through pumping
Gas well is collected, and is reduced gas injection well 3 and flowed into cleaning area with the methane of exterior domain.
In the embodiment of the present invention, the aperture of extraction well 2 and gas injection well 3 generally in 110mm-200mm, drills on the ground
Afterwards, the high density polyethylene pipe of punching is vertically put into hole, rubble is inserted around pipe.The upper end of pipe shaft should be higher than that ground surface 1m
Left and right.
Fig. 3 is the arrangement schematic diagram of monitoring well, and the intermediate region of two adjacent extraction wells 2 is the weaker area of Extracting Ability
Domain, therefore, in conjunction with Fig. 5, between two extraction wells 2 adjacent in first straight line of the embodiment of the present invention there are three spaced sets
Monitoring well 8, is provided with gas concentration detector in each monitoring well 8, during fan operation, needs to the gas in monitoring well 8
Bulk concentration is monitored, and when the methane concentration in monitoring well is higher than 5%, should suitably increase pumping intensity, until in monitoring well
Methane concentration be lower than 5%.
In the embodiment of the present invention, gas concentration detector generally selects online gas concentration analyzer (sucking rate 0.8-
1L/min, model: TY-6020P).Certainly, gas concentration detector can also be selected as other models, the embodiment of the present invention pair
This is with no restriction.
Fig. 4 is the pipeline arrangement schematic diagram of extraction well in the embodiment of the present invention, in conjunction with Fig. 4, the embodiment of the invention also includes
Multiple first branch pipes 4 and first general pipeline 5, the first branch pipe 4 and extraction well 2 are correspondingly arranged, one end of the first branch pipe 4 with it is corresponding
Extraction well 2 upper end connection, the other ends of multiple first branch pipes 4 is connected to first general pipeline 5 and the first wind on the first general pipeline 5
Machine connection is discharged by the gas that the first blower is extracted extraction well 2.
Fig. 5 is the pipeline arrangement schematic diagram of gas injection well in the embodiment of the present invention, in conjunction with Fig. 5, the embodiment of the invention also includes
Multiple second branch pipes 6 and second general pipeline 7, the second branch pipe 6 and gas injection well 3 are correspondingly arranged, one end of the second branch pipe 6 with it is corresponding
Gas injection well 3 upper end connection, the other ends of multiple second branch pipes 6 is connected to second general pipeline 7 and the second wind on the second general pipeline 7
Machine connection, is injected air into the junk-heap body near cleaning area by the second blower.
In the embodiment of the present invention, the pipeline that extraction well 2 and gas injection well 3 are connected to various blowers is total more using one
The arrangement of branch can optimize pipeline arrangement, and save connection pipeline used.
In the embodiment of the present invention, extraction well 2 can be connected with the branch pipe connected to it of gas injection well 3 by way of hot melt,
It is of course also possible to by other means, such as bump joint etc., the embodiment of the present invention to this with no restriction.
In the embodiment of the present invention, the flow proportional of the first blower and the second blower is arranged according to 1.5:1~1.2:1, flow
Value can be designed according to field condition, and flow increases with the increase of the distance between extraction well and gas injection well.
Further, in the embodiment of the present invention, sample tap can be set on the first general pipeline 5, gas concentration is supervised
It surveys, to obtain gas concentration.Due to the mixed gas that the gas collected in extraction well is methane and oxygen, the first fan operation phase
Between, the methane concentration in the first general pipeline should be kept to be maintained at 10% hereinafter, can avoid explosion accident.
When the sample tap on the first general pipeline 5 detects methane concentration lower than 5%, can construct to cleaning area, when
When detecting that methane concentration continues 3 days lower than 2%, the operation intensity of gas injection blower can be suitably reduced, saves operating cost.
After the completion of the rubbish cleaning in extraction well and gas injection well cleaning area, the gas injection well and extraction well can be successively closed
Corresponding control valve dismantles corresponding pipeline, and can continue drilling well-digging excavating neighboring area along route, and will disassembly
Pipeline move to new perforated area and installed, use can be re-started after installation.It dismantles the quantity of gas well and reinstalls
Quantity can be adjusted according to construction speed.
As a kind of deformation of above-described embodiment, the embodiment of the present invention is also provided with another refuse landfill and is hindered with gas
It is every the difference of arragement construction, the barrier structure and above-described embodiment, multiple extraction wells are on first lap, multiple gas injection wells
On the second circle, i.e., first lap setting is between the second circle and cleaning area.Making this change is based on cleaning area institute
Construction environment setting, i.e., the embodiment of the present invention can be based on above-mentioned design philosophy, and according to specific construction environment into
Row flexible setting, is not influenced by orographic condition.
Based on above-mentioned thought, the embodiment of the invention also provides a kind of refuse landfill gas barrier method, the sides
Method is carried out using above-mentioned barrier arragement construction, this method comprises:
Extraction well and gas injection well are arranged on the junk-heap body on the outside of cleaning area；
Air is injected into junk-heap body using gas injection well, methane passes through extraction well in the air and cleaning area of injection
It draws the oxygen to extraction well, in air to chemically react with methane, to reduce the methane in cleaning area.
In the embodiment of the present invention, since gas injection well and extraction well can carry out flexible design according to the landform of landfill yard, not by
The influence of orographic condition, and gas injection well and extraction well are reusable, will not cause secondary pollution to landfill yard place, because
This, has the characteristics that construction technology is simple, time-consuming short, at low cost and easy to maintain.
Following illustrated embodiment is better embodiment of the invention, only is used to facilitate to illustrate the present invention, not to this hair
The bright limitation made under any form has usually intellectual in any technical field, if not departing from the proposed skill of the present invention
In the range of art feature, using the equivalent embodiment for locally changing or modifying made by disclosed technology contents, and
Without departing from technical feature content of the invention, in the range of still falling within the technology of the present invention feature.
Claims (10)
1. a kind of refuse landfill gas barrier arragement construction, which is characterized in that the barrier arragement construction includes extraction well
And gas injection well, in which:
The extraction well is provided with multiple, and multiple extraction wells are in first straight line；
The gas injection well is also equipped with multiple, and multiple gas injection wells are in second straight line；
The first straight line and the first straight line are successively arranged far from cleaning area.
2. refuse landfill according to claim 1 gas barrier arragement construction, which is characterized in that the first straight line
The distance between described cleaning area boundary is equal to or less than the distance between the first straight line and the second straight line.
3. refuse landfill according to claim 2 gas barrier arragement construction, which is characterized in that the first straight line
The distance between the distance between described cleaning area boundary, the first straight line and described second straight line are no more than 10m.
4. refuse landfill according to claim 2 gas barrier arragement construction, which is characterized in that the first straight line
On extraction well and the second straight line on gas injection well interlaced arrangement.
5. refuse landfill according to claim 4 gas barrier arragement construction, which is characterized in that the first straight line
On an extraction well and the second straight line on two gas injection wells adjacent with one extraction well, be in equilateral triangle
Shape arrangement.
6. refuse landfill according to claim 5 gas barrier arragement construction, which is characterized in that the first straight line
Spaced set is provided with gas concentration in each monitoring well there are three monitoring well between upper two adjacent extraction wells
Detector.
7. refuse landfill according to claim 1 gas barrier arragement construction, which is characterized in that further include multiple
One branch pipe and first general pipeline, first branch pipe and the extraction well are correspondingly arranged, one end of first branch pipe with it is right
The upper end of the extraction well answered is connected to, and the other end of multiple first branch pipes is connected on first general pipeline, and described the
One general pipeline is connected to the first blower.
8. refuse landfill according to claim 1 gas barrier arragement construction, which is characterized in that further include multiple
Two branch pipes and second general pipeline, second branch pipe and the gas injection well are correspondingly arranged, one end of second branch pipe with it is right
The upper end of the gas injection well answered is connected to, and the other end of multiple second branch pipes is connected on second general pipeline, and described the
Two general pipeline are connected to the second blower.
9. a kind of refuse landfill gas barrier arragement construction, which is characterized in that the barrier arragement construction includes extraction well
And gas injection well, in which:
The extraction well is provided with multiple, and multiple extraction wells are on first lap；
The gas injection well be also equipped with it is multiple, multiple gas injection wells be in second circle on；
The first lap setting is between second circle and cleaning area.
10. a kind of refuse landfill gas barrier method, which is characterized in that the method is any using claim 1-9
What the barrier arragement construction described in carried out, which comprises
Extraction well and gas injection well are arranged on the junk-heap body on the outside of cleaning area；
Air is injected into junk-heap body using gas injection well, methane is drawn by extraction well in the air and cleaning area of injection
To extraction well, the oxygen in air is chemically reacted with methane, to reduce the methane in cleaning area.
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| CN201811547689.4A CN109847557A (en) | 2018-12-18 | 2018-12-18 | Refuse landfill gas barrier arragement construction and blocking method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441208A (en) * | 2019-08-09 | 2019-11-12 | 陈芬娜 | A kind of landfill site seepage prevention system tracking and monitoring well and its method for arranging |
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