CN202041355U - Landfill leachate leakage and its position detection device - Google Patents

Abstract

The utility model discloses a leachate seepage and position detection device on a refuse landfill. The detection device comprises an electric wire network, a PVC (Poly Vinyl Chloride) sleeve network and a high density resistivity instrument; the electric wire network is composed of an X-direction electric wire array extending along the X-direction and a Y-direction electric wire array extending along the Y-direction; PVC sleeves are sleeved outside electric wires in the electric wire network, thereby correspondingly forming the PVC sleeve network, and the pipe walls of the PVC sleeve pipes are provided with holes for leachate to flow in and out; and the electric wire network and the PVC sleeve network are respectively arranged in a second rubble layer of the refuse landfill or in a lower soil mass of a seepage-proofing layer, the X-direction electric wire array and the Y-direction electric wire array are respectively and electrically connected with the input end of the high density resistivity instrument, and the high density resistivity instrument is arranged outside the refuse landfill. The leachate seepage and position detection device on the refuse landfill can detect the seepage of the leachate as well as the specific position and the scope of the seepage.

Description

Landfill leachate leakage and its position detection device

technical field

The utility model relates to leachate detection equipment, in particular to a device for detection of leachate leakage and its position in landfill sites.

Background technique

With the rapid development of my country's economic construction and the improvement of people's living standards, more and more garbage needs to be landfilled. In modern sanitary landfills, geomembrane and clay layers are laid at the bottom for anti-seepage treatment. Affected by construction factors, such as geomembrane puncture, seam separation, and uneven settlement of the bottom clay layer, the geomembrane will be cracked, etc. It is difficult to ensure that there are no holes or cracks in the geomembrane. If the clay layer is not handled well, cracks will easily occur , so even with a landfill with double-layer anti-seepage treatment, it is difficult to guarantee that there will be no leachate leakage.

Once the leachate leaks into the groundwater and soil, it will cause serious pollution. The traditional method of detecting whether leachate has leaked is to drill water quality observation wells in the affected area of the landfill area, extract groundwater samples, and compare uncontaminated water samples with potentially polluted water samples. Check for leaks. When leakage is detected by this method, serious leakage and groundwater soil pollution have often occurred, and the specific location of leachate leakage cannot be detected. Therefore, in view of the above problems, it is necessary to develop a device that can detect whether leachate is leaking and determine its specific location.

Utility model content

In view of this, the purpose of the present utility model is to provide a leachate leakage and its position detection device in a landfill site, which can detect the leakage of the leachate and the specific location of the leakage.

In order to achieve the above object, the solution of the present utility model is:

A landfill leachate leakage and its position detection device, including a wire network, a PVC casing network and a high-density resistivity meter; the wire network consists of an X-direction wire array extending along the X direction and a The extended Y-direction wire array is formed; the wires in the wire network are respectively sleeved with PVC sleeves to form the PVC sleeve network correspondingly, and the pipe wall of the PVC sleeve is provided with a holes; the wire net and the PVC casing net are respectively arranged in the second layer of gravel layer of the landfill or in the lower soil of the anti-seepage layer, and the X-direction wire array and the Y-direction wire array are electrically connected respectively To the input of a high-density resistivity instrument located outside the landfill.

The X-direction wire array and the Y-direction wire array are arranged at intervals up and down.

The X-direction wire array is located in one plane, and the Y-direction wire array is located in another plane.

The X-direction wire array is electrically connected to the input end of one high-density resistivity meter, and the Y-direction wire array is electrically connected to the input end of another high-density resistivity meter.

The X-direction wire array and the Y-direction wire array are located above the middle of the second gravel layer of the landfill or above the middle of the lower soil body of the anti-seepage layer.

After adopting the above-mentioned structure, the utility model has the following beneficial effects on the leakage of landfill leachate and its position detection device:

1. The criss-crossing wires constitute the Y-direction wire array and the X-direction wire array respectively, thus forming a wire network, in which the wires are placed in the PVC casing to prevent them from being pulled due to external force; In the lower soil of the seepage layer or in the second gravel layer, and form an electrical connection with the high-density resistivity meter; if the resistivity of a certain position corresponding to the wire network decreases significantly, it means that the wires in the wire network If it is conducted by the leachate, it is judged that there is leakage; the utility model can determine the Y-direction and X-direction positions of the leakage through the X-direction wire array and the Y-direction wire array, so as to find out the leakage in the landfill. The specific location of the leakage; the device can conveniently, quickly and accurately detect whether the leachate has leaked, and determine the specific location of the leakage, avoiding the time-consuming and time-consuming process of extracting groundwater for chemical composition analysis and comparison in traditional testing methods The problem of power and detection delay;

2. The X-direction wire array and the Y-direction wire array are arranged at intervals up and down, so that the leachate seeps through the X-direction wire array and the Y-direction wire array from top to bottom, and then the specific location of the leakage is determined through the X and Y directions; The leakage position determined by the up and down seepage of the leachate can reduce the monitoring position error caused by the spread and diffusion of the leachate on the same plane, and further improve the accuracy of finding the leak position.

Description of drawings

Fig. 1 is the structure schematic diagram of leachate seepage and position detection device of the utility model landfill;

Fig. 2 is a schematic diagram of the layout of X-direction electric wires and Y-direction electric wires in the second gravel layer;

Fig. 3 is the coordination diagram of PVC casing and electric wire;

Fig. 4 is a schematic diagram of the layout of X-direction electric wires and Y-direction electric wires in the landfill.

In the picture:

PVC sleeve net 10 PVC sleeve 101

Wire network 11 X-direction wire 111

X-direction wire array 112 Y-direction wire 113

Y-direction wire array 114 High-density resistivity meter 12

Landfill 20 The first layer of gravel layer 211

The first layer of geomembrane 212 The first layer of clay layer 213

The second gravel layer 221 The second geomembrane layer 222

Second clay layer 223

Detailed ways

In order to further explain the technical solution of the utility model, the utility model is described in detail through specific examples below.

As shown in Figures 1-4, the utility model leachate leakage and position detection device of the landfill site mainly consists of a PVC casing network 10, a wire network 11 and a high-density resistivity meter 12.

The wire network 11 is composed of wires arranged in a criss-cross pattern, wherein the X-direction wires 111 extending horizontally form an X-direction wire array 112, and the X-direction wire array 112 is in the same horizontal plane; the Y-direction wires 113 extending longitudinally form a Y-direction wire array 114 , the Y-direction wire array 114 is in the same horizontal plane. The X-direction wire array 112 and the Y-direction wire array 114 keep a certain distance up and down, and the X-direction wire array 112 and the Y-direction wire array 114 at different heights form a monitoring network.

The X-direction wire array 112 and the Y-direction wire array 114 are electrically connected to the input end of a high-density resistivity meter 12 respectively, and the two high-density resistivity meters 12 are placed outside the landfill 20 for testing the X-direction and Y-direction respectively. The resistivity between the upward wires is convenient for timely monitoring.

The X-direction electric wires 111 and the Y-direction electric wires 113 respectively pass through the PVC casing 101 , thus correspondingly forming a PVC casing network 10 . The PVC casing is used to protect the electric wires and prevent the electric wires from being pulled off; some holes are drilled on the pipe wall of the PVC casing 101, and the diameter of the holes should not be too large, and the number should not be too many. The leachate enters the interior of the PVC casing 101 through the hole, and soaks into the electric wire, and the surface layer of the electric wire is coated with an antirust agent to prevent corrosion due to air and leachate.

PVC sleeve pipe net 10 and wire net 11 are laid in the second layer gravel cushion layer 221 of refuse landfill 20; Early detection of leakage occurs in time to provide the best opportunity for plugging. Of course, the wire network 11 can also be laid in the lower soil mass of the anti-seepage layer.

In this embodiment, the first layer of gravel layer 211, the first layer of geomembrane 212, the first layer of clay layer 213, the second layer of gravel layer 221, and the second layer of geomembrane 222 are successively laid in the landfill 20. And the second layer of clay layer 223 etc., the wire network 11 is laid in the second layer of crushed stone cushion layer 221 of the landfill 20 . If the first layer of geomembrane 212 and the first layer of clay layer 213 are damaged, the leachate will leak into the second layer of gravel layer 221 through the damaged part, and the leachate will further pass through the holes on the pipe wall of the PVC casing 10. Enter the interior of the PVC sleeve 10 and soak into one of the wire nets 11; if the leachate area expands and soaks into two wires in the wire net 11, the resistivity of the two wires will decrease significantly, indicating that the two wires Leakage leakage has occurred at this position in the landfill site corresponding to the root wire; specifically, the X-direction wire 111 can only determine the Y-direction position corresponding to the leakage, and then the Y-direction wire 113 can be used to determine the corresponding position of the leakage. The X-direction position, the position jointly determined by X-direction and Y-direction is the specific location of leachate leakage. In particular, the leachate seeps through the X-direction wire array 112 and the Y-direction wire array 114 arranged at intervals from the bottom to the bottom, and conducts the X-direction wire 111 and the Y-direction wire 113 in turn; this is determined by the way of seepage up and down The leakage position can reduce the monitoring position error caused by the spread and diffusion of leachate in the same plane.

The key of the utility model is to make full use of the resistivity in the crushed stone layer after the leachate leakage occurs, and the X direction and the Y direction of the wire network are arranged to determine the X of the landfill leachate leakage. Direction and Y-direction position; Through multi-point search, not only the location of the leak can be determined, but also the scope of the leak can be determined. Therefore, the device can conveniently, quickly and accurately detect whether the leachate has leaked, and determine the specific location and scope of the leak, avoiding the time-consuming and labor-intensive testing of groundwater for chemical composition analysis and comparison in traditional testing methods. The problem of delay provides a new way for leachate leak detection and location determination.

The above-mentioned embodiments and accompanying drawings do not limit the product form and style of the present utility model, and any appropriate changes or modifications made by those skilled in the art should be regarded as not departing from the patent scope of the present utility model.

Claims (5)

1. A landfill leachate seepage and position detection device thereof, is characterized in that: comprise wire network, PVC casing pipe network and high-density resistivity meter; The wire array and the Y-direction wire array extending along the Y direction are formed; each wire in the wire network is covered with a PVC sleeve to correspond to the PVC sleeve network, and the pipe wall of the PVC sleeve is provided for The hole for the leachate to enter and exit; the wire mesh and the PVC sleeve mesh are respectively arranged in the second layer of gravel layer of the landfill or in the lower soil of the anti-seepage layer, the X-direction wire array and the Y-direction wire array The arrays are each electrically connected to the input of a high density resistivity instrument located outside the landfill. 2. The leachate leakage and position detection device of landfill site according to claim 1, characterized in that: the X-direction wire array and the Y-direction wire array are arranged at intervals up and down. 3. The landfill leachate leakage and its position detection device according to claim 2, characterized in that: the X-direction wire array is located in one plane, and the Y-direction wire array is located in another plane . 4. The landfill leachate leakage and its position detection device as claimed in claim 1, 2 or 3, characterized in that: the X-direction wire array is electrically connected to the input end of a high-density resistivity instrument , the Y-direction wire array is electrically connected to the input end of another high-density resistivity instrument. 5. The landfill leachate leakage and its position detection device as claimed in claim 4, characterized in that: the X-direction wire array and the Y-direction wire array are located on the second layer of the waste landfill Above the middle of the crushed stone layer or above the middle of the underlying soil of the anti-seepage layer.

Images