CN115824710B - Landfill leachate collecting device and method - Google Patents
Landfill leachate collecting device and method Download PDFInfo
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- CN115824710B CN115824710B CN202211281892.8A CN202211281892A CN115824710B CN 115824710 B CN115824710 B CN 115824710B CN 202211281892 A CN202211281892 A CN 202211281892A CN 115824710 B CN115824710 B CN 115824710B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 relates to the technical field of landfill leachate monitoring, in particular to a landfill leachate collecting device and method, comprising a sampling container, wherein the top of the sampling container is open and is aligned to the outlet of a leachate discharge pipe, the bottom of the sampling container is provided with a seepage hole, and the seepage flow of the seepage hole is equal to the target production flow of leachate under the set liquid level state; the sliding device automatically sinks and inclines when one end reaches a set weight, and the sampling container is placed at the end and automatically slides off; a storage container for receiving the sampling container slid off the slide-off device; the invention is based on the dynamic balance relation among the leakage flow rate and accumulation amount of the leakage hole of the sampling container and the target generation flow rate of the percolate, and can acquire quantitative detection samples in time when the target generation flow rate of the landfill leachate reaches a set threshold value.
Description
Technical Field
The invention relates to the technical field of landfill leachate monitoring, in particular to a landfill leachate collecting device and method.
Background
The landfill leachate is an unavoidable product in a landfill, and is high-concentration organic wastewater formed by infiltration of moisture through a garbage layer and a soil covering layer, and the landfill leachate has complex composition components and contains various metal ions, organic pollutants and total soluble solids.
The environmental threat of landfill sites is great, so that the emission of pollutants such as landfill leachate needs to be monitored. The garbage percolate is affected by precipitation and surface runoff, has the characteristics of complex water quality, large water quantity change and the like, and has unstable strength. When the generated intensity of the percolate is small, sampling and monitoring of the generated amount, components and concentration are not needed; on the contrary, when the intensity is high, the percolate is required to be sampled and collected, and the concentration of pollutants is monitored. Thus, leachate generation and concentration monitoring is an important aspect of landfill maintenance and supervision.
The premise of realizing the monitoring of the landfill leachate is that a leachate sample is timely collected, detected and analyzed. Aiming at the monitoring of landfill leachate, the prior art is realized by combining an automatic flowmeter with a manual inspection mode. When the ultrasonic wave of the electromagnetic flowmeter propagates in the fluid, the information of the flow velocity of the fluid is carried, so that the flow velocity of the percolate can be detected through the received ultrasonic wave and then converted into the flow, thereby achieving the purpose of measuring the flow. When the target generated flow of the landfill leachate reaches a set threshold, the device can transmit a signal to relevant on-duty personnel to remind the personnel to go to the site for sampling. Therefore, the defects of the prior art are that the sampling needs manual intervention and special personnel is needed to be attended; on the other hand, because the time difference exists between the flow early warning and the manual sampling, the staff needs to wait for the flow to last for a period of time to collect the sample which is sufficiently detected after arriving at the site, and the situation that the flow is reduced and the sampling amount is insufficient after arriving at the site manually can also exist. In addition, the cost of the flowmeter-based monitoring technology is high, and the automatic device is easy to fail during long-term operation and has low reliability.
Disclosure of Invention
The invention aims to provide a device and a method for collecting landfill leachate, which are used for solving the problems that in the prior art, when the target production flow of the landfill leachate reaches a set threshold, manual intervention sampling is needed, and quantitative detection samples cannot be timely obtained. In order to achieve the above object, the present invention solves the following problems by the following technical scheme:
in a first aspect, the present invention provides a landfill leachate collection apparatus comprising:
the top of the sampling container is open and is aligned with the outlet of the percolate discharge pipe, the bottom of the sampling container is provided with a seepage hole, and the seepage flow of the seepage hole is equal to the target generation flow of the percolate under the set liquid level state;
the sliding device automatically sinks and inclines when one end reaches a set weight, and the sampling container is placed at the end and automatically slides off;
a storage container for receiving the sampling container slid off the slide-off device.
As a further technical scheme, the sliding device is a balance, one end of the sliding device is provided with the sampling container, and the other end of the sliding device is provided with a weight with set weight.
As a further technical scheme, the weight of the weight is equal to the weight of the percolate in the sampling container under the state of setting liquid level.
As a further solution, the storage container is arranged on the side of the balance on which the sampling container is placed, to receive the sampling container that slides off the balance tray.
As a further technical scheme, the two sides of the storage container are one high and one low, and the top of the low side is level with the height of the tray when the balance is inclined.
As a further technical solution, the device further comprises an early warning device, wherein the early warning device comprises a pressure sensor arranged below the sampling container.
As a further technical scheme, the sliding device touches the pressure sensor in an inclined state.
As a further technical scheme, the leakage hole is arranged at the bottom center of the sampling container, and the bottom center of the sampling container is lower than other positions of the bottom.
As a further technical scheme, the cavity of the sampling container is a circular cavity.
In a second aspect, the invention provides a method of collecting a landfill leachate collection device according to the first aspect, comprising the steps of:
determining the liquid level H when the sampling container slides down according to the target generated flow Q of percolate, the radius R of the sampling container and the radius R of the bottom leakage hole 0 And the weight of percolate at this level;
assembling the collection device so that the top opening of the collection container is aligned with the outlet of the percolate discharge pipe, and when the leakage flow rate of the leakage hole is equal to the target generation flow rate Q of the percolate, collecting the percolate weight G of the collection container 0 When the threshold value of self-sliding is reached, the self-sliding starts, and the storage container receives the sliding collecting container.
The beneficial effects of the invention are as follows:
(1) The leakage flow rate of the leakage hole of the sampling device is equal to the target generation flow rate of the percolate under the set liquid level state, and the leakage flow rate and the accumulation amount of the leakage hole of the sampling container are based on the dynamic balance relation between the leakage flow rate and the accumulation amount of the leakage hole of the sampling container and the target generation flow rate of the percolate.When the generated amount of the percolate is small, the percolate is discharged through a leakage hole at the bottom of the sampling container and cannot be accumulated; when the generated flow rate of the percolate reaches a certain level, the percolate is accumulated continuously, and when the generated flow rate is equal to the leakage flow rate of the leakage hole, the percolate is maintained at a set liquid level H 0 And a set weight G 0 . When the target production flow of the landfill leachate reaches a set threshold, a quantitative detection sample can be timely obtained.
(2) According to the invention, the sliding device is arranged, when the percolate in the sampling container reaches the set weight threshold value, the sliding device automatically tilts, so that the sampling container can automatically deviate from the outlet of the percolate discharge pipe, the percolate is not collected any more, and meanwhile, the percolate sample is quantitatively collected by means of the automatic sliding of the sampling container.
(3) The sampling device can realize automatic sampling and early warning of garbage percolate in remote areas, and has simpler structure and lower cost compared with other automation devices with complex structures, and has higher reliability under the long-term use under the field severe conditions compared with the automation devices with a large number of sensors.
(4) After the invention determines the flow target of the landfill leachate, the height of the corresponding sampling and collecting standard liquid level and the weight of the leachate in the device can be calculated; by setting different sampling and collecting standard liquid level heights, flow early warning and automatic sampling under the condition of different percolate generation intensity threshold values can be realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It should also be understood that the drawings are for simplicity and clarity and have not necessarily been drawn to scale. The invention will now be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
FIG. 1 is a schematic diagram of a collection device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an apparatus for sampling a percolate in a container according to an embodiment of the present invention, when the percolate does not reach a set level;
fig. 3 shows a schematic view of an apparatus for achieving a set level of percolate in a sampling container according to an embodiment of the present invention.
In the figure: 1. a sampling container; 2. a storage container; 3. a balance; 4. a pressure sensor.
Detailed Description
The technical solutions in the exemplary embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in fig. 1 to 3, this embodiment provides a landfill leachate collection apparatus, including: a sampling container 1, a slide device and a storage container 2.
The sampling vessel 1 has a circular cavity. In two aspects, firstly, the number of containers with circular cavities is large, the specification type is easy to select, and the cost is low; and secondly, the method is beneficial to later calculation to determine relevant parameters of the device. Of course, in other embodiments, other types of sampling containers may be selected, and are not limited to the type in this embodiment. The top of the sampling container 1 is open and is aligned with the outlet of the percolate discharge pipe, the bottom is provided with a seepage hole, and the seepage flow of the seepage hole is equal to the target generation flow of the percolate under the set liquid level state.
The leak hole is arranged at the bottom center of the sampling container 1, and the bottom center of the sampling container 1 is lower than other positions at the bottom, so that percolate leaks in time, and the accuracy of sampling is ensured.
The sampling device of this embodiment is based on a dynamic balance relationship between the leakage flow rate, accumulation amount, and target generation flow rate of the percolate of the sampling container leakage orifice. When the generated amount of the percolate is small, the percolate is discharged through a leakage hole at the bottom of the sampling container and cannot be accumulated; when the generated flow rate of the percolate reaches a certain level, the percolate is accumulated continuously, and when the generated flow rate is equal to the leakage flow rate of the leakage hole, the percolate is maintained at a set liquid level H 0 And a set weight G 0 . When the target production flow of the landfill leachate reaches a set threshold, a quantitative detection sample can be timely obtained.
The liquid level H to be set can be determined according to the target generated flow Q of the percolate, the cross section radius R of the sampling container and the bottom seepage hole radius R 0 And percolate weight G 0 。
The sliding device of the embodiment is a balance 3, one end of the balance 3 automatically sinks and tilts under the set weight, and the sampling container 1 is placed at the end and automatically slides off; namely, one end tray of the balance 3 is provided with the sampling container 1, and the other end tray is provided with a weight with set weight. The weight of the weight is equal to the weight of the percolate in the sampling container 1 under the state of setting liquid level.
Through setting up the landing device, when the percolate in the sampling container reached the settlement weight threshold value, the landing device was inclined by oneself for the sampling container can make its uncovered skew percolate discharge pipe export by oneself, no longer collects the percolate, relies on the self-landing of sampling container simultaneously, realizes the quantitative collection percolate sample.
The sampling device further comprises an early warning device, the early warning device comprises a pressure sensor 4 arranged below the sampling container 1, and the pressure sensor 4 is touched in an inclined state of the sliding device. When the weight of one side of the sampling device is more than or equal to the weight of the weight, the balance can incline to be in contact with the pressure sensor to realize early warning, and information is transmitted to relevant attendees through the pressure sensor.
The sampling device of this embodiment can realize the automatic sampling and the early warning of remote region landfill leachate, compares other complicated automation device of structure, and the structure is simpler, the cost is lower, compares with the automation device that possesses a large amount of sensors, and the long-term reliability is higher under the use of open-air adverse condition.
The storage container 2 is used for receiving the sampling container 1 sliding from the sliding device, the storage container 2 is arranged on one side of the balance 3 where the sampling container 1 is placed, so as to receive the sampling container 1 sliding from the tray of the balance 3, and the storage container 2 is used for storing the sampling container 1 and the percolate in the sampling container 1 and can prevent the percolate in the sampling container 1 from spilling.
To ensure proper sliding, the two sides of the storage container 2 are higher and lower, and the top of the lower side is level with the height of the tray when the balance 3 is inclined.
Example 2
This example provides a method of collection according to the landfill leachate collection apparatus as in example 1, comprising the steps of:
determining the liquid level H when the sampling container 1 slides down according to the target generated flow Q of percolate, the radius R of the sampling container 1 and the radius R of the bottom leakage hole 0 And the weight of percolate at this level. The determination process is as follows:
according to the bernoulli equation:
where p is the pressure at a point in the fluid, v is the flow rate at that point in the fluid, ρ is the fluid density, g is the gravitational acceleration, and h is the height at that point. Wherein subscripts 1 and 2 respectively represent the set liquid level and the leakage hole, H is the height difference between the liquid level and the leakage hole, and H 1 -h 2 =h; in the device, P is in the atmospheric pressure state 1 ＝P 2 The method comprises the steps of carrying out a first treatment on the surface of the When the liquid surface area is far greater than the leak hole area, the liquid surface flow rate, i.e. v, can be ignored 1 =0, so that it is possible to:
considering that the size and shape of the leak hole can influence the flow rate and flow rate of the leak hole in the fluid flowing process, the actual flow rate of the leak hole needs to be corrected by using the flow coefficient mu, and the precondition is that R > R is:
when the radius of the container is R and the liquid level is H, the leakage flow L at the leakage hole is:
thus, knowing the permeate target production flow rate Q, a vessel radius R and a leak hole radius R (and R>>r) when Q is more than or equal to L, the increasing rate of the volume of the percolate in the sampling container is larger than the leaking rate, the percolate is accumulated in the sampling device, and the liquid level is gradually increased until the sampling collection standard H is reached 0 The weight of the percolate reaches G 0 At this time:
namely:
G 0 ＝ρ×πR 2 ×H 0
wherein, 0.755 (R: r=40) is more than or equal to mu and less than or equal to 0.827 (R: r=23.33).
The collecting device is assembled, so that the top opening of the collecting container is aligned with the outlet of the percolate discharging pipe, and the percolate discharged from the inside of the pipe enters the sampling container through the top opening and flows out through the bottom leakage hole. The bottom leakage hole landfill leachate leakage flow is related to the liquid level in the sampling container, and the higher the liquid level is, the larger the landfill leachate leakage flow is. When the generated amount is small, the percolate is discharged through a seepage hole at the bottom of the sampling container and cannot be accumulated, and as shown in fig. 2, the initial state of the balance is a state of tilting to the right; when the generated flow rate of the percolate reaches a certain level, the percolate is accumulated continuously, and when the leakage flow rate of the leakage holes is equal to the target generated flow rate Q of the percolate, the percolate is maintained at a set liquid level H 0 And a set weight G 0 The weight G of the percolate from the collection container 0 Greater than the weight G, the threshold of self-sliding is reached, the self-sliding starts, the storage container 2 receives the sliding collection container, and the balance is in a leftward inclined state as shown in fig. 3. Meanwhile, the balance 3 is inclined and is in contact with the pressure sensor 4 to realize early warning, and information can be transmitted to relevant attendees through the pressure sensing device.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (9)
1. A landfill leachate collection device, comprising:
the top of the sampling container is open and is aligned with the outlet of the percolate discharge pipe, the bottom of the sampling container is provided with a seepage hole, and the seepage flow of the seepage hole is equal to the target generation flow of the percolate under the set liquid level state;
the sliding device automatically sinks and inclines when one end reaches a set weight, and the sampling container is placed at the end and automatically slides off;
a storage container for receiving the sampling container slid off the slide-off device;
the leakage hole is arranged at the bottom center of the sampling container, and the bottom center of the sampling container is lower than other positions at the bottom;
dynamic balance among leakage flow, accumulation and percolate target generation flow based on a sampling container leakage hole;
when the generated amount of the percolate is small, the percolate is discharged through a leakage hole at the bottom of the sampling container and cannot be accumulated;
when the generated flow of the percolate reaches a certain level, the percolate can be continuously accumulated, and when the generated flow is equal to the leakage flow of the leakage hole, the percolate can be maintained at a set liquid level and a set weight;
when the percolate in the sampling container reaches a set weight threshold, the sliding device automatically tilts, and a percolate sample is quantitatively collected.
2. A landfill leachate collection device according to claim 1, wherein the sliding device is a balance, one end of which is provided with the sampling vessel, and the other end of which is provided with a weight of a set weight.
3. A landfill leachate collection device according to claim 2, wherein the weight is equal to the weight of the leachate at the set level in the sampling vessel.
4. A landfill leachate collection device according to claim 2, wherein the storage container is arranged on the side of the balance on which the sampling container is placed to receive the sampling container which slides off the balance tray.
5. The landfill leachate collection apparatus of claim 4, wherein the storage vessel has a top side which is level with the height of the tray when the scale is tilted.
6. A landfill leachate collection device according to claim 1, further comprising an early warning device comprising a pressure sensor arranged below the sampling vessel.
7. A landfill leachate collection device according to claim 6, wherein the slide is in contact with the pressure sensor in an inclined state.
8. A landfill leachate collection device according to claim 1, wherein the cavity of the sampling vessel is a circular cavity.
9. A method of collecting a landfill leachate collection plant according to any of claims 1 to 8, comprising the steps of:
determining the sliding condition of the sampling container according to the flow Q generated by the percolate target, the radius R of the sampling container and the radius R of the bottom leakage holeLevel height H 0 And the percolate weight G at this level 0 ；
Assembling the collection device so that the top opening of the collection container is aligned with the outlet of the percolate discharge pipe, and when the leakage flow rate of the leakage hole is equal to the target generation flow rate Q of the percolate, collecting the percolate weight G of the collection container 0 When the threshold value of self-sliding is reached, the self-sliding starts, and the storage container receives the sliding collecting container.
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| CN203464984U (en) * | 2013-09-22 | 2014-03-05 | 刘焕君 | Self-lifting container combination applying oblique support springs |
| CN203865328U (en) * | 2014-05-16 | 2014-10-08 | 吴萍 | Garbage leachate regulating tank |
| CN107051906A (en) * | 2017-06-28 | 2017-08-18 | 江苏展邦智能科技有限公司 | A kind of detection means for product weight qualification rate |
| CN108575742A (en) * | 2018-03-12 | 2018-09-28 | 段先平 | A kind of tissue culture device of Botany Experiment |
| CN211026992U (en) * | 2019-11-18 | 2020-07-17 | 长安大学 | Aggregate screening device for automatically screening mineral aggregate according to target gradation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT406551B (en) * | 1998-11-26 | 2000-06-26 | Muenze Oesterreich Ag | Installation for sorting workpieces |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203464984U (en) * | 2013-09-22 | 2014-03-05 | 刘焕君 | Self-lifting container combination applying oblique support springs |
| CN203865328U (en) * | 2014-05-16 | 2014-10-08 | 吴萍 | Garbage leachate regulating tank |
| CN107051906A (en) * | 2017-06-28 | 2017-08-18 | 江苏展邦智能科技有限公司 | A kind of detection means for product weight qualification rate |
| CN108575742A (en) * | 2018-03-12 | 2018-09-28 | 段先平 | A kind of tissue culture device of Botany Experiment |
| CN211026992U (en) * | 2019-11-18 | 2020-07-17 | 长安大学 | Aggregate screening device for automatically screening mineral aggregate according to target gradation |
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