CN111924970A - Landfill leachate recharging device and recharging method - Google Patents
Landfill leachate recharging device and recharging method Download PDFInfo
- Publication number
- CN111924970A CN111924970A CN202010932307.0A CN202010932307A CN111924970A CN 111924970 A CN111924970 A CN 111924970A CN 202010932307 A CN202010932307 A CN 202010932307A CN 111924970 A CN111924970 A CN 111924970A
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- layer
- recharging
- hollow
- layers
- garbage
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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
- 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
- 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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
Abstract
The invention discloses a landfill leachate recharging device and method. The recharging device comprises a plurality of layers of hollow pipes which are nested in sequence; the layers of hollow pipes can extend upwards layer by layer from outside to inside and are fixedly connected in sequence after extending, and the lower end of the hollow pipe at the outermost layer is closed and is in a needle point shape; landfill leachate and/or compressed gas can be input from the upper layer or layers of the hollow pipes and output from the lower layer or layers of the hollow pipes through holes. The recharging method adopts the recharging device. The recharging device is simple in overall structure and flexible in operation method, and the recharging of the garbage leachate can be conveniently and quickly realized by adopting the recharging device.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a landfill leachate recharging device and method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The landfill leachate is high-concentration organic wastewater with complex components, mainly comes from rainfall, biodegradable water and internal water of garbage, and can cause serious pollution to the ecological environment and harm to human health if the garbage is not properly treated. The leachate volume of the domestic garbage landfill is large, and the problem of concentrated solution is always a main factor for restricting the domestic garbage landfill to improve the treatment efficiency and reduce the treatment cost. In the United states, the method of recharging the landfill with the leachate is adopted from the 70 s, and the leachate is re-evolved by utilizing the biological, chemical and physical effects of the landfill garbage per se, so that the aims of reducing pollutants such as COD, BOD5, heavy metals and the like of the leachate, reducing the leachate amount, shortening the landfill stabilization time and reducing the final disposal cost are fulfilled. However, the leachate recirculation technology is greatly influenced by specific recirculation measures, and common modes such as fixed well recirculation, surface spraying and the like have problems such as poor flexible adaptability of a fixed well, overproof odor of surface spraying and the like.
Disclosure of Invention
The invention aims at the existing problems and provides a landfill leachate recirculation device and a recirculation method.
The invention discloses a landfill leachate recirculation device, which is characterized in that:
comprises a plurality of layers of hollow pipes which are nested in sequence;
the layers of hollow pipes can extend upwards layer by layer from outside to inside and are fixedly connected in sequence after extending, and the lower end of the hollow pipe at the outermost layer is closed and is in a needle point shape;
landfill leachate and/or compressed gas can be input from the upper layer or layers of the hollow pipes and output from the lower layer or layers of the hollow pipes through holes.
Further, the recharging device comprises an inner pipe and an outer pipe which are nested inside and outside.
Furthermore, the inner pipe is provided with a connector or connecting threads for connecting with a conveying hose of landfill leachate or compressed gas.
Furthermore, through holes are uniformly distributed on the circumference of the outer pipe and are used for distributing percolate and/or compressed gas into a refuse landfill.
Furthermore, the hollow pipe of the inner layer extends upwards from the inside of the hollow pipe of the outer layer and then is fixedly connected with the hollow pipe of the inner layer through a rotary buckle.
Furthermore, the hollow pipes are concentrically arranged in a plurality of layers, the diameter of each hollow pipe is 4-8cm, and the length of each hollow pipe is 2.0-5.0 m.
Based on any one of the recharging devices, the invention also discloses a landfill leachate recharging method, which comprises the following steps:
inserting the hollow pipe at the outermost layer into the garbage layer until the hollow pipe is basically and completely embedded into the garbage layer;
firstly, pulling out the hollow pipe layer which is the outermost and not pulled out upwards, then fixedly connecting the hollow pipe layer with the hollow pipe layer on the outer layer, then continuously inserting the garbage layer downwards until the garbage layer is basically and completely buried into the garbage layer again, and repeating the operation until the garbage layer is inserted downwards to the target depth;
the landfill leachate and/or compressed gas are input from the plurality of layers of hollow pipes which are pulled out finally and output from the through holes on the plurality of layers of hollow pipes at the lower part.
Furthermore, a plurality of sets of recharging devices are inserted into the refuse landfill in the recharging area, and the recharging devices are transferred to other positions after continuous recharging for a certain time.
Further, the landfill leachate and the compressed gas are alternately pumped in the recharging process until the water content in a certain area around the hollow pipe reaches saturation, and the landfill leachate and the compressed gas are successively stopped being pumped.
Further, the compressed gas is suitable for the survival of anaerobes.
By comprehensively adopting the technical scheme, the invention can obtain the following beneficial effects:
1. the device is simple and flexible, and the odor exceeding phenomenon cannot be caused;
2. enough dry garbage protective layers are left, so that the operation machine can be effectively prevented from sinking;
3. the recharging device is movable, can be changed into a fixed type, and is flexible and easy to use.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; either directly or indirectly through intervening media, either internally or in any other relationship. In the present invention, the term "landfill leachate" is to be understood in a broad sense and includes landfill leachate or its concentrate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention discloses a landfill leachate recirculation device which comprises a plurality of layers of hollow pipes which are nested and telescopic in sequence, and landfill leachate and/or compressed gas can be input from the upper part of the recirculation device and then output to a landfill site from the lower part of the recirculation device.
In some embodiments, the layers of hollow pipes can extend upwards from outside to inside layer by layer, and the hollow pipes can be fixedly connected in sequence after the hollow pipes are changed from the contraction state to the expansion state, so that the recharging device can be suitable for refuse landfill sites with different depths. In at least one embodiment, after the hollow pipe of the inner layer extends upwards from the hollow pipe of the outer layer, the hollow pipe of the inner layer is fixedly connected with the hollow pipe of the outer layer through a rotary buckle. In at least one embodiment, the lower end of the outermost hollow tube is closed and pointed, or the lower end of the outermost hollow tube is equipped with a pointed steel head, so that the refilling device can be inserted more easily. In at least one embodiment, landfill leachate and/or compressed gas can be fed into the upper layer or layers of hollow tubes and out through holes in the lower layer or layers of hollow tubes.
In some embodiments, several layers of hollow tubes are concentrically arranged and have a diameter of 4-8cm, preferably 5-7cm, such sized hollow tubes being more suitable for domestic landfills. In some embodiments, the length of the hollow tube is 2.0-5.0m, and the specific length can be properly optimized according to the thickness of the garbage layer; preferably, the length of the garbage protective layer is not less than 2.2m, so that a dry garbage protective layer with the length of more than 2m is reserved, and the garbage operation machine is prevented from being trapped; preferably, the length is not more than 4m, so as to facilitate the field construction operation of transferring and inserting the garbage layer; the length of the hollow tube may preferably be 3 m.
In some embodiments, the recharging device comprises an inner tube and an outer tube nested inside and outside. In at least one embodiment, the inner tube is provided with a connector or connecting threads for connecting with a conveying hose for landfill leachate or compressed gas. In at least one embodiment, the outer pipe is provided with through holes distributed uniformly around its circumference for distributing leachate and/or compressed gas into the landfill.
Based on any one of the recharging devices, the invention also discloses a landfill leachate recharging method, which comprises the following steps:
step 1, inserting the hollow pipe at the outermost layer into a garbage layer until the hollow pipe is basically and completely embedded into the garbage layer;
in the step 1, the recharging device is in an initial state, the hollow pipes of the inner layers of all the layers are not pulled out, and the hollow pipes of the outermost layer are downwards inserted into the garbage layer after being subjected to pressure until the hollow pipes of the outermost layer are basically and completely embedded into the garbage layer;
step 2, firstly, pulling out a layer of hollow pipe which is the outermost and is not pulled out upwards, then fixedly connecting the layer of hollow pipe with the hollow pipe on the outer layer, then continuously inserting the garbage layer downwards until the garbage layer is basically and completely buried into the garbage layer again, and repeating the operation until the garbage layer is inserted downwards to the target depth;
in step 2, the hollow pipes in the inner layers are pulled out layer by layer from outside to inside and are fixedly connected in sequence according to the pulling-out sequence;
and 3, inputting the landfill leachate and/or compressed gas from the plurality of layers of hollow pipes which are pulled out finally, and outputting the landfill leachate and/or compressed gas from the plurality of layers of hollow pipes at the lower part through holes.
In step 3, before the landfill leachate and/or compressed gas are pumped, the recharging device is ensured to be kept in a sealed state except for the input and output ports of the landfill leachate and/or compressed gas, so as to prevent liquid leakage or gas leakage at unnecessary positions, and various embodiments of the recharging device in the sealed state are provided, which are conventional technical means of those skilled in the art and are not described again.
As a preferred method of recharging, a number of sets of recharging devices may be inserted into the landfill in the recharging area and transferred to other locations after a certain period of continuous recharging.
As a preferable recharging method, the landfill leachate and the compressed gas are alternately pumped in the recharging process until the water content in a certain area around the hollow pipe reaches saturation, and the landfill leachate and the compressed gas are successively stopped being pumped.
As a preferred recharging method, the compressed gas is a gas suitable for the survival of anaerobic bacteria.
Exemplary embodiment 1
In the exemplary embodiment, two layers of concentric hollow steel tubes, which are 5-7cm in diameter and are nested, may be referred to as inner and outer tubes, respectively. The inner pipe can be pulled out from the outer pipe and is provided with a connector or connecting threads so as to be convenient for connecting a pumping hose of the landfill leachate and/or compressed gas; the circumference of the outer pipe is evenly perforated, and the lower end of the outer pipe is provided with a sharp steel head. Therefore, the inner and outer layers of tubes are in the structure of the injection needle, and can be respectively called as an inner layer injection clock and an outer layer injection needle. The length of hollow steel pipe is 3m, and the inner tube is through rotatory buckle and outer tube fixed connection after pulling out in the outer tube, and interior outer tube stack length is 6 m. It should be noted that the length of the hollow steel tube can be properly adjusted according to the thickness of the garbage layer, but the inner tube and the outer tube can not be shorter than 2.2m, so that a dry garbage protective layer with the thickness of more than 2m is reserved, and the garbage operation machine is prevented from sinking; meanwhile, the longest length of the inner pipe and the outer pipe is not larger than 4m, which is inconvenient for the site construction operation of transferring and inserting the garbage layer.
In operation practice, the inner pipe and the outer pipe in the contraction state are inserted into the garbage layer, the inner pipe is pulled out after being downwards inserted for about 3 meters, then the inner pipe and the outer pipe are fixedly connected through the rotating buckle, then the inner pipe and the outer pipe in the extension state are continuously downwards inserted until the depth is about 6m, and at the moment, the inner pipe and the outer pipe are basically and completely inserted into the garbage. Wherein, a plurality of sets of the re-irrigation devices are inserted in the re-irrigation area and are arranged in a square shape at intervals of 3 m. Then connecting the landfill leachate and a compressed gas pumping hose, and recharging the landfill.
In the recharging process, in order to avoid short flow at the bottom of the garbage penetrating fluid injection area, the garbage percolate and the compressed gas can be alternately pumped until the water content of the garbage around the bottom of the recharging device is saturated, the garbage percolate stops being pumped, the compressed gas is continuously added for a plurality of minutes to accelerate the diffusion of the garbage percolate, then the compressed gas is stopped being pumped, and the recharging operation is finished. Due to the fact that the landfill leachate is sticky or the filtration performance of the landfill layer is poor, the inner hole of the landfill layer is blocked, the concentrated garbage solution is difficult to pump into the landfill layer, the phenomenon of short flow occurs, and the blocked hole can be dredged by alternately pumping the landfill leachate and the compressed gas. The compressed gas can be compressed air, but the garbage layer can not pump air when entering the methanogenesis stage, and can be changed into other gases because of strict anaerobism of methane bacteria. Alternatively, a gas suitable for the survival of anaerobic bacteria may be used throughout. The recharging device can be moved once after several days of continuous recharging according to the landfill progress, and the operations are repeated.
Exemplary embodiment 2
The present exemplary embodiment differs from exemplary embodiment 1 in that:
the square arrangement is arranged in the reinjection area, and the interval is expanded to 5 m. The length of the lengthened hollow steel pipe can be changed along with the landfill thickness by welding, and the open hole sections are arranged at intervals of 2.5-3 m.
The fixed well is difficult to clean, dredge or move after being filled with landfill leachate and blocked, and the problem can be well solved by adopting the recharging device in the exemplary embodiment. Compared with a fixed well recharging facility, the recharging device in the exemplary embodiment is semi-fixed, and when the lower part is blocked, the injection needle type recharging device can be taken out and moved to other places for continuous use.
Exemplary embodiment 3
The present exemplary embodiment differs from exemplary embodiment 1 in that:
microorganism inoculation is added into the garbage percolate, compressed gas is pumped in after heating, the optimal environment for decomposing organic matters by microorganisms at the initial stage of the garbage layer can be provided, and particularly under the condition of low temperature in winter, hot air is pumped into the lower garbage layer, so that the garbage decomposition can be accelerated.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. The utility model provides a landfill leachate recharging device which characterized in that:
comprises a plurality of layers of hollow pipes which are nested in sequence;
the layers of hollow pipes can extend upwards layer by layer from outside to inside and are fixedly connected in sequence after extending, and the lower end of the hollow pipe at the outermost layer is closed and is in a needle point shape;
landfill leachate and/or compressed gas can be input from the upper layer or layers of the hollow pipes and output from the lower layer or layers of the hollow pipes through holes.
2. A recharging device according to claim 1, characterized in that: the recharging device comprises an inner pipe and an outer pipe which are nested inside and outside.
3. A recharging device according to claim 2, characterized in that: the inner pipe is provided with a connector or connecting threads and is used for being connected with a conveying hose of garbage percolate or compressed gas.
4. A recharging device according to claim 2, characterized in that: through holes are uniformly distributed on the circumference of the outer pipe and are used for distributing percolate and/or compressed gas into a refuse landfill.
5. A recharging device according to claim 1, characterized in that: the hollow pipe of the inner layer extends upwards from the hollow pipe of the outer layer and then is fixedly connected with the hollow pipe of the inner layer through a rotary buckle.
6. A recharging device according to claim 1, characterized in that: the hollow pipes are concentrically arranged in a plurality of layers, the diameter of each layer of hollow pipes is 4-8cm, and the length of each layer of hollow pipes is 2.0-5.0 m.
7. A landfill leachate recirculation method, characterized by using the recirculation apparatus of any one of claims 1 to 6, and comprising the steps of:
inserting the hollow pipe at the outermost layer into the garbage layer until the hollow pipe is basically and completely embedded into the garbage layer;
firstly, pulling out the hollow pipe layer which is the outermost and not pulled out upwards, then fixedly connecting the hollow pipe layer with the hollow pipe layer on the outer layer, then continuously inserting the garbage layer downwards until the garbage layer is basically and completely buried into the garbage layer again, and repeating the operation until the garbage layer is inserted downwards to the target depth;
the landfill leachate and/or compressed gas are input from the plurality of layers of hollow pipes which are pulled out finally and output from the through holes on the plurality of layers of hollow pipes at the lower part.
8. A method of recharging as claimed in claim 7, wherein: and inserting a plurality of set of recharging devices on the refuse landfill of the recharging area, and transferring the recharging devices to other positions after continuous recharging for a certain time.
9. A method of recharging as claimed in claim 7, wherein: and alternately pumping the landfill leachate and the compressed gas in the recharging process until the water content in a certain area around the hollow pipe reaches saturation, and stopping pumping the landfill leachate and the compressed gas successively.
10. A method of recharging as claimed in claim 7, wherein: the compressed gas is suitable for the survival of anaerobic bacteria.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010932307.0A CN111924970A (en) | 2020-09-08 | 2020-09-08 | Landfill leachate recharging device and recharging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010932307.0A CN111924970A (en) | 2020-09-08 | 2020-09-08 | Landfill leachate recharging device and recharging method |
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| CN111924970A true CN111924970A (en) | 2020-11-13 |
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| CN202010932307.0A Pending CN111924970A (en) | 2020-09-08 | 2020-09-08 | Landfill leachate recharging device and recharging method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115477443A (en) * | 2022-09-13 | 2022-12-16 | 四川省科源工程技术测试中心 | Landfill leachate recharge system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115477443A (en) * | 2022-09-13 | 2022-12-16 | 四川省科源工程技术测试中心 | Landfill leachate recharge system |
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Application publication date: 20201113 |