CN114226389B - Gas-liquid synchronous collection method and system for refuse landfill - Google Patents
Gas-liquid synchronous collection method and system for refuse landfill Download PDFInfo
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- CN114226389B CN114226389B CN202111529892.0A CN202111529892A CN114226389B CN 114226389 B CN114226389 B CN 114226389B CN 202111529892 A CN202111529892 A CN 202111529892A CN 114226389 B CN114226389 B CN 114226389B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
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- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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Abstract
The invention discloses a method and a system for synchronously collecting gas and liquid in a refuse landfill, wherein the method comprises the following steps: laying a percolate guide and discharge layer on the impermeable layer of the landfill, wherein the percolate guide and discharge layer comprises graded gravel and a plurality of mixed guide and discharge pipes of percolate and landfill gas which are embedded in the graded gravel at intervals; the mixed guide and discharge pipe of the percolate and the landfill gas is a porous pipe, the upper part of the porous pipe is communicated with a landfill gas collecting branch pipe, and the lower part of the porous pipe is communicated with a percolate collecting branch pipe; the percolate collecting branch pipes are collected by the percolate collecting main pipe and then connected with a percolate treatment system through a liquid pumping device; the landfill gas collecting branch pipes are collected by the landfill gas collecting main pipe and then connected with a landfill gas treatment system through an air extractor; after the garbage enters the landfill site, the air exhaust device is started, and then the collection of leachate and landfill gas can be started. The invention can solve the problems of high water level, collapse of garbage dump and the like caused by the fact that the early-stage landfill gas-free collection system cannot collect landfill gas and the lower-layer landfill gas collection effect is poor in the garbage landfill process.
Description
Technical Field
The invention relates to the field of household garbage landfill, in particular to a method and a system for synchronously collecting gas and liquid in a garbage landfill.
Background
Domestic garbage in China has the characteristics of high water content and high organic matter content, and a large amount of toxic and harmful landfill gas and high-concentration dangerous leachate can be generated in the degradation process. In order to reduce pollution caused by landfill gas and leachate, a landfill gas collection system and a leachate collection system are common pollution control means for a landfill. However, in the case that the gas collecting device is damaged due to uneven garbage settlement or is submerged by leachate which is not discharged in time to form a water seal, the gas collecting efficiency is rapidly reduced, and the efficiency range of a part of landfill sites with insufficient collecting efficiency is only 2% -14%. In addition, the gas collecting device is generally installed or started after the landfill reaches a certain height and the geomembrane is covered, so that a large amount of landfill gas (such as carbon dioxide, methane, hydrogen sulfide, methyl mercaptan and the like) cannot be collected in time due to the fact that the landfill gas collection and the landfill are asynchronous, and the landfill gas is directly dissipated into the atmospheric environment, so that the human health and the environment are threatened.
At present, the existing gas collection system of the refuse landfill has the following defects: (1) After the landfill yard is closed, a vertical extraction well or a gas collecting pipe is drilled and erected to collect landfill gas, the gas collecting mode cannot collect pollution gas before a gas collecting system is installed on the landfill yard, and the gas collecting system is easy to lose the collecting effect due to damage of the gas collecting pipe or high water level of percolate caused by garbage settlement; (2) Horizontal or vertical gas collecting pipes are arranged at the bottom, the middle, the top and the like of the refuse landfill unit to serve as temporary gas collecting devices, the gas collecting mode is complex in construction and increases construction cost, and the gas collecting pipes arranged in the refuse landfill unit are easy to damage and break in the refuse compaction and sedimentation processes, so that the gas collecting effect is influenced; (3) Because most landfill sites have large burial depth, the landfill gas collecting system does not have good collecting effect on landfill gas generated by deep garbage.
Disclosure of Invention
The invention aims to provide a gas-liquid synchronous collection method and a gas-liquid synchronous collection system for a refuse landfill, which are used for solving the problem that landfill gas during the operation of the refuse landfill and the landfill gas deposited in the deep part of a refuse dump after closing the landfill are difficult to be well collected.
In order to realize the purpose, the technical scheme of the invention is as follows:
a landfill gas-liquid synchronous collection method comprises the following steps:
laying a percolate guide and discharge layer on the impermeable layer of the landfill, wherein the percolate guide and discharge layer comprises graded gravel and a plurality of mixed guide and discharge pipes of percolate and landfill gas which are embedded in the graded gravel at intervals;
the mixed guide and discharge pipe of the percolate and the landfill gas is a porous pipe, the upper part of the porous pipe is communicated with a landfill gas collecting branch pipe, and the lower part of the porous pipe is communicated with a percolate collecting branch pipe;
the percolate collecting branch pipes are collected by the percolate collecting main pipe and then connected with a percolate treatment system through a liquid pumping device; the landfill gas collecting branch pipes are collected by the landfill gas collecting main pipe and then connected with a landfill gas treatment system through an air extractor;
after the garbage enters the landfill site, the liquid pumping device and the air pumping device are started, and then the collection of leachate and landfill gas can be started.
Further, the air extraction rate of the air extraction device is required to enable negative pressure to be formed inside the landfill.
Preferably, the extraction amount of the landfill gas collecting branch pipe is 0.14 to 2.4m 3 H/t, wherein m 3 Is cubic meter, h is hour, t is ton.
Furthermore, the leachate treatment system adopts a two-stage DT-RO reverse osmosis process, and comprises a sand filter, a first-stage reverse osmosis system, a second-stage reverse osmosis system and a leachate storage tank, so that the effluent reaches the class V water standard and is discharged.
Furthermore, the landfill gas treatment system comprises a device for removing water, desulfurizing and removing volatile organic compounds and carbon dioxide, and the obtained high-concentration methane gas is sent to a generator set for power generation.
The invention also discloses a gas-liquid synchronous collecting system of the refuse landfill, which comprises a percolate guide and discharge layer paved on the impermeable layer of the refuse landfill;
the percolate guide and discharge layer comprises graded gravel and a plurality of mixed guide and discharge pipes of percolate and landfill gas which are embedded in the graded gravel at intervals; the mixed guide and discharge pipe of the percolate and the landfill gas is a porous pipe, the upper part of the porous pipe is communicated with a landfill gas collecting branch pipe, and the lower part of the porous pipe is communicated with a percolate collecting branch pipe; the percolate collecting branch pipes are collected by the percolate collecting main pipe and then connected with a percolate treatment system through a liquid pumping device; the landfill gas collecting branch pipes are collected by the landfill gas collecting main pipe and then connected with a landfill gas treatment system through an air extractor.
Preferably, the inner diameter of the mixed guide and discharge pipe of the percolate and the landfill gas is 1m, the aperture of the opening is 20-50 mm, the distribution of the holes is arranged in a mode of upper thinning and lower sealing, the opening rate is 10-15%, and the distance between two adjacent pipes is not more than 20m.
Preferably, the inner diameters of the percolate collecting branch pipe, the percolate collecting main pipe, the landfill gas collecting branch pipe and the landfill gas collecting main pipe are 150-500 mm.
Preferably, the landfill gas collecting branch pipe is internally provided with an air pressure detection module for controlling the air extraction amount of the air extractor to keep the interior of the landfill site in a negative pressure state and inhibit the landfill gas from diffusing to the surrounding environment.
Preferably, a static pressure liquid level meter is arranged inside the percolate collecting branch pipe (the end with the lower elevation), the height of the static pressure liquid level meter is lower than the pipe bottom elevation of the landfill gas collecting branch pipe, when the static pressure liquid level meter detects that the liquid level in the percolate collecting branch pipe is higher than a set value, an automatic alarm is given out, an operator is prompted to start the standby percolate collecting branch pipe at the other end of the percolate and landfill gas mixing and guiding pipe, the percolate stock in a landfill site is reduced, and accidents such as collapse of a landfill body caused by the fact that percolate enters the landfill gas collecting branch pipe and the percolate liquid level is too high are avoided.
Compared with the prior art, the invention has the following advantages:
(1) The leachate collection system is already built before the garbage enters the landfill site, and landfill gas can be collected in time through the leachate collection system, so that the disordered discharge of the polluted gas in the landfill operation process is reduced.
(2) Landfill gas is collected to filtration liquid collection system, has more direct collection effect to the landfill gas that lower floor's rubbish produced, avoids the landfill gas of rubbish lower part a large amount of aggregations to produce the top support effect to filtration liquid, leads to filtration liquid water level harmony high, takes place rubbish heap body landslide accident.
(3) Except using novel filtration liquid collecting system, need not to increase other collection facilities, avoid increasing the construction cost of landfill.
Drawings
FIG. 1 is a front view of the landfill gas-liquid synchronous collection system of the present invention;
FIG. 2 is a top view of the landfill gas-liquid synchronous collection system of the present invention;
description of reference numerals: 1-an impermeable layer; 2-a percolate collecting branch pipe; 3-a percolate collecting header pipe; 4-landfill gas collecting main pipe; 5-an air pressure detection module; 6-landfill gas collecting branch pipes; 7-mixed guide and discharge pipe of percolate and landfill gas; 8-leachate guide and drainage layer; 9-filling a buried layer with garbage; 10-a centrifugal pump; 11-Roots blower; 12-a landfill gas treatment system; 13-a leachate treatment system; 14-static pressure liquid level meter.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
Referring to fig. 1 and 2, a gas-liquid synchronous collection system for a landfill site is used for collecting landfill gas and leachate generated by landfill, and mainly comprises a leachate guiding and draining layer 8 laid on an impermeable layer 1 of the landfill site.
Specifically, the leachate guide and drainage layer 8 mainly comprises leachate and landfill gas mixed guide and drainage pipe 7 and graded gravel, and the leachate and landfill gas mixed guide and drainage pipe 7 is laid in the graded gravel and has a certain gradient, so that the leachate is convenient to collect.
The mixed guide and exhaust pipe 7 for percolate and landfill gas is used for collecting percolate and landfill gas, and in order to realize the purpose of automatically separating percolate and landfill gas by utilizing different gas-liquid densities, a large-diameter HDPE porous pipe can be selected, the inner diameter is 1m, the aperture of an opening is 20-50 mm, the distribution of the holes is arranged in a mode of being sparse at the top and dense at the bottom, and the aperture ratio is 10-15%. In order to ensure the collection effect of the percolate and the landfill gas, a plurality of parallel mixed guide and discharge pipes 7 of the percolate and the landfill gas need to be laid, and the distance between every two adjacent pipes is not more than 20m.
For in time deriving filtration liquid and landfill gas, respectively connect a landfill gas collection branch pipe 6 in every filtration liquid and the mixed drainage pipe 7 of landfill gas about both ends face upside, respectively connect a filtration liquid collection branch pipe 2 in the same terminal surface downside simultaneously, wherein, the filtration liquid collection branch pipe 2 of the higher terminal surface connection of elevation is as reserve. The percolate collecting branch pipe 2 and the landfill gas collecting branch pipe 6 extend upwards out of a garbage landfill layer 9, are collected through a percolate collecting main pipe 3 and a landfill gas collecting main pipe 4 respectively, and enter a percolate treatment system 13 and a landfill gas treatment system 12. The percolate collecting main pipe 3 is provided with a centrifugal pump 10 for pumping percolate, and the landfill gas collecting main pipe 4 is provided with a roots blower 11 for pumping landfill gas.
In this embodiment, the percolate collecting branch pipes 2, the percolate collecting main pipe 3, the landfill gas collecting branch pipes 6 and the landfill gas collecting main pipe 4 use HDPE pipes with an inner diameter of 150-500 mm, and the diameters of the branch pipes are not larger than that of the main pipe.
After the garbage enters the landfill site, the collection of leachate and landfill gas can be started. Under the suction action of the percolate collecting branch pipes 2 and the landfill gas collecting branch pipes 6, negative pressure is formed inside the percolate guide and discharge layer 8 and the landfill site 9 on the percolate guide and discharge layer, the landfill percolate and the landfill gas gradually migrate to the mixed percolate and landfill gas guide and discharge pipe 7, and due to different densities, the landfill gas and the percolate are automatically separated in the mixed percolate and landfill gas guide and discharge pipe 7, enter the percolate collecting main pipe 3 and the landfill gas collecting main pipe 4 through the percolate collecting branch pipes 2 and the landfill gas collecting branch pipes 6 respectively, and finally enter the percolate treatment system 13 and the landfill gas treatment system 12 respectively for subsequent treatment.
Preferably, the leachate collection branch pipe 2 inside of the lower one end of elevation still is provided with static pressure level gauge 14, its bottom elevation that highly is less than the landfill gas collection branch pipe 6 of homonymy, automatic alarm when static pressure level gauge 14 detects that the liquid level in the leachate collection branch pipe 2 is higher than the setting value, suggestion operating personnel opens leachate collection branch pipe 2 of leachate and the mixed drainage pipe 7 other end of landfill gas, increase leachate collection speed, reduce the leachate stock in the landfill yard, avoid leachate to get into landfill gas collection branch pipe 6, also play the effect that prevents the leachate liquid level too high and lead to the rubbish heap body accident of collapsing.
The leachate treatment system 13 adopts a two-stage DT-RO reverse osmosis process, mainly comprises a sand filter, a first-stage reverse osmosis system, a second-stage reverse osmosis system and a leachate storage tank, and discharges the effluent after the effluent reaches the V-type water standard. The landfill gas treatment system 12 mainly includes devices for removing water, sulfur, volatile organic compounds and carbon dioxide, and finally high-concentration methane gas can be obtained and sent to a generator set for power generation.
At present, the garbage porosity in garbage landfill sites in China is generally between 0.6 and 0.8, and the garbage density is between 600 and 900 kg.m -3 The average water content of the garbage is between 40 and 60 percent. Calculating a formula according to the void volume of the garbage:
V qi (Qi) ＝V Fixing device ·n-V Water (W)
Wherein m is the garbage mass (kg), and omega is the average water content (%) of the garbage; rho w Is the density (kg. M) of water at that time at room temperature -3 ) N is porosity, V Fixing device Is the total volume (m) of the garbage 3 )，V Qi (Qi) Is the volume of the refuse void, i.e. the volume of landfill gas in the refuse pores (m) 3 )，V Water (W) Is the volume (m) of water in the garbage 3 )。
The volume range of the buried gas in each ton of garbage is calculated to be 0.067-1.2 m 3 . Therefore, it is recommended that the extraction rate of the landfill gas collecting branch pipe 6 per hour is 2 times of the volume of the landfill gas in the garbage, that is, the extraction rate of 0.14 to 2.4m is provided for each ton of the garbage 3 And h, the air extraction quantity of the landfill gas collecting main pipe 4 per hour is the sum of the air extraction quantities of all the landfill gas collecting branch pipes 6.
The principle of controlling the discharge of the landfill gas is that negative pressure is formed inside the landfill site, so that the landfill gas is transferred downwards and collected by a percolate and landfill gas mixed guide and discharge pipe 7. Therefore, the exhaust rate of the landfill gas collecting header pipe 4 is determined to be based on the standard that negative pressure can be formed inside the landfill site, and according to the standard, the air pressure detection module 5 can be arranged inside the landfill gas collecting branch pipe 6, and the exhaust amount can be adjusted within the range of the available exhaust amount according to the monitoring result of the air pressure detection module 5, so that the internal air pressure of the landfill site is not greater than the atmospheric pressure, and the purpose of reducing landfill gas emission is achieved.
In conclusion, the large-diameter percolate guide and discharge pipe is arranged in the percolate guide and discharge layer, so that the joint collection of percolate and landfill gas is realized, the landfill gas can be collected after the refuse is filled into a landfill, and the gas pollution during the refuse landfill is reduced. Even after the landfill gas collecting system of the refuse landfill is installed, the invention can still play a role because the invention has good collecting effect on the landfill gas generated by the lower-layer refuse. Therefore, the invention well solves the problems of water level blockage, garbage dump collapse and the like caused by the fact that the early-stage landfill gas-free collection system cannot collect landfill gas and the lower-layer landfill gas collection effect is poor in the garbage landfill process.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (9)
1. A gas-liquid synchronous collection method for a refuse landfill is characterized by comprising the following steps: the method comprises the following steps:
laying a percolate guide and discharge layer on the impermeable layer of the landfill, wherein the percolate guide and discharge layer comprises graded gravel and a plurality of mixed guide and discharge pipes of percolate and landfill gas which are embedded in the graded gravel at intervals;
the mixed guide and discharge pipe of the percolate and the landfill gas is a porous pipe, the upper part of the porous pipe is communicated with a landfill gas collecting branch pipe, and the lower part of the porous pipe is communicated with a percolate collecting branch pipe;
the percolate collecting branch pipes are collected by the percolate collecting main pipe and then connected with a percolate treatment system through a liquid pumping device; the landfill gas collecting branch pipes are collected by the landfill gas collecting main pipe and then connected with a landfill gas treatment system through an air extractor;
after the garbage enters the landfill site, the collection of leachate and landfill gas can be started by starting the liquid pumping device and the air pumping device, wherein the air pumping speed of the air pumping device needs to enable the interior of the landfill site to form negative pressure.
2. The landfill gas of claim 1The liquid synchronous collection method is characterized in that: the extraction amount of the landfill gas collecting branch pipe is 0.14 to 2.4m 3 H/t, wherein m 3 Is cubic meter, h is hour, t is ton.
3. The landfill gas-liquid synchronous collection method according to claim 1, wherein: the leachate treatment system adopts a two-stage DT-RO reverse osmosis process, comprises a sand filter, a first-stage reverse osmosis system, a second-stage reverse osmosis system and a leachate storage tank, and discharges the effluent after the effluent reaches the V-type water standard.
4. The landfill gas-liquid synchronous collection method according to claim 1, wherein: the landfill gas treatment system comprises devices for removing water, desulfurizing and volatile organic compounds and carbon dioxide, and the obtained high-concentration methane gas is sent to a generator set for power generation.
5. The utility model provides a landfill gas-liquid synchronous collection system which characterized in that: comprises a percolate guide and drainage layer paved on an impermeable layer of a landfill;
the percolate guide and discharge layer comprises graded gravel and a plurality of mixed guide and discharge pipes of percolate and landfill gas which are embedded in the graded gravel at intervals; the mixed guide and discharge pipe of the percolate and the landfill gas is a porous pipe, the upper part of the porous pipe is communicated with a landfill gas collecting branch pipe, and the lower part of the porous pipe is communicated with a percolate collecting branch pipe; the percolate collecting branch pipes are collected by the percolate collecting main pipe and then connected with a percolate treatment system through a liquid pumping device; the landfill gas collecting branch pipes are connected with a landfill gas treatment system through an air extractor after being collected by the landfill gas collecting main pipe, so that negative pressure is formed in the landfill site.
6. The landfill gas-liquid synchronous collection system according to claim 5, wherein: the inner diameter of the mixed guide and discharge pipe of the percolate and the landfill gas is 1m, the aperture of the opening is 20-50 mm, the distribution of the holes adopts a form of upper thinning and lower sealing, the opening rate is 10-15%, and the distance between two adjacent pipes is not more than 20m.
7. The landfill gas-liquid synchronous collection system according to claim 6, wherein: the inner diameter ranges of the percolate collecting branch pipe, the percolate collecting main pipe, the landfill gas collecting branch pipe and the landfill gas collecting main pipe are 150-500 mm.
8. The landfill gas-liquid synchronous collection system of claim 5, wherein: and an air pressure detection module is arranged in the landfill gas collecting branch pipe.
9. The landfill gas-liquid synchronous collection system of claim 5, wherein: and a static pressure liquid level meter is arranged in the percolate collecting branch pipe.
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| KR20000063713A (en) * | 2000-07-31 | 2000-11-06 | 김영민 | Separated Discharging System for LFG(Landfill-Gas) and Leachate in the Landfill |
| CN100531942C (en) * | 2004-02-04 | 2009-08-26 | 同济大学 | On-spot treatment method for leachate of landfill field |
| WO2007082002A2 (en) * | 2006-01-11 | 2007-07-19 | Douglas Diemer | Waste management facilities for the production of hydrogen gas and reduction of greenhouse gases |
| CN1903458A (en) * | 2006-07-31 | 2007-01-31 | 同济大学 | Dumping method for producing garbage dumping gas by using special garbage filling units |
| JP5763980B2 (en) * | 2011-06-14 | 2015-08-12 | 大成建設株式会社 | Final disposal site structure |
| CN106140777B (en) * | 2015-03-24 | 2018-06-22 | 深圳市利赛实业发展有限公司 | Landfill gas level collects well and its application |
| CN105921482A (en) * | 2016-07-11 | 2016-09-07 | 中国环境科学研究院 | Rural domestic waste treatment system and process based on quasi-aerobic landfill |
| CN106592646B (en) * | 2016-12-05 | 2019-03-12 | 北京大学深圳研究生院 | A kind of dynamic bidirectional guide control method of percolate and landfill gas |
| CN209873824U (en) * | 2019-03-29 | 2019-12-31 | 深圳相控科技股份有限公司 | Landfill district slope drainage gas recovery system |
| CN111672864A (en) * | 2020-07-01 | 2020-09-18 | 武汉环投城市废弃物运营管理有限公司 | Drainage and air guide pipeline for landfill |
| CN111940450A (en) * | 2020-08-26 | 2020-11-17 | 胡伟儒 | Landfill leachate and landfill gas collecting system and method |
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