Internet of Things-based landfill leakage monitoring system

[0019] Example 1

[0020] Please refer to Figure 1-Figure 5 , The landfill in this embodiment from top to bottom is the garbage landfill layer 1, gravel diversion layer 2, the on-film clay layer 3, and the under-film clay layer 4, the bottom of the on-film clay layer 3 and the garbage landfill The buried layer 1, the gravel guide layer 2 and the clay layer 3 on the membrane are wrapped with an impermeable membrane 5, and the underside of the impermeable membrane 5 is provided with an automatic resistivity acquisition system 6, which includes cables 61, The detection sensor 62 and the high-density electrical method 63. The cable 61 is arranged in a continuous bow shape on the lower side of the impermeable membrane 5. The detection sensor 62 is arranged on the cable 61, and the high-density electrical method 63 is fixedly connected to the end of the cable 61. The automatic resistivity acquisition system 6 is connected to the cloud service platform 7, the cloud service platform 7 is connected to the control terminal 8, and the control terminal 8 is connected to the automatic data processing system 9.

[0021] The automatic data processing system 9 includes an electric sensor system 91, an electric sensor signal conversion system 92, and a data processing and analysis system 93. The electric sensor system 91 is connected to the electric sensor signal conversion system 92, and the electric sensor signal conversion system is connected to the data processing and analysis system 92. 93. The electric sensor system 91 is buried in the monitored field, and establishes an electric field by supplying power underground and monitors the electric field potential; the electric sensor signal conversion system 92 receives the instruction of the data processing and analysis system 93 and selects the power supply of the electric sensor system 91 in the monitored field At the same time, the measurement signal of the electric sensor system 91 is transmitted to the data processing and analysis system 93; the data processing and analysis system 93 controls the various actions of the entire 3D online monitoring system, and simultaneously processes and analyzes the collected data in real time to determine the monitoring field The leakage point and pollution diffusion range of the area.

[0022] Both the automatic resistivity acquisition system 6 and the control terminal 8 are connected to the cloud service platform 7 through a wireless network.

[0023] The cable 61 includes a signal line 64 and a cable line 65 to realize electrical conduction and signal transmission simultaneously. The cable 61 extends along the edge of the impermeable membrane 5 to the opposite edge in the transverse direction of the bow shape. The cable 61 is in the bow shape. The distances in the longitudinal direction are equal. Of course, the cable 61 can also be routed according to the actual topography of the landfill.

[0024] The impermeable membrane 5 includes a bottom surface 51, two side surfaces 52 and two flat surfaces 53. Both ends of the bottom surface 51 are integrally formed with the side surface 52, and the other ends of the two side surfaces 52 are integrally formed with the flat surface 53.

[0025] The detection sensors 62 are arranged at equal intervals on the cable 61.

[0026] Theoretical basis: After leakage occurs in the landfill, the leachate invades into the vadose zone, and the resistivity of the soil decreases with the increase of water content; when the leachate continues to migrate downward to the saturated zone Because the leachate contains many ions, its resistivity is lower than that of water, so the resistivity of the pore water in the soil layer is reduced, which in turn reduces the resistivity of the soil layer. All in all, after the leachate in general landfills penetrates into the ground, it will reduce the resistivity of the soil and form a low-resistance area in the underground soil layer. The landfill leachate spreads horizontally and vertically in the soil layer, forming a three-dimensional plume pollution area. The area where the leachate diffuses can be monitored by detecting the abnormality of the resistivity of the underground soil.

[0027] After the leachate penetrates into the underground soil layer, the resistivity of the polluted medium will decrease, and the intrusion of petroleum pollutants will cause the resistivity of the polluted medium to increase. This electrical change law forms the basis of the resistivity monitoring system.

[0028] Working process: The automatic resistivity acquisition system 6 detects the resistivity change and then transmits it to the cloud service platform 7, the control terminal 8 and the automatic data processing system 9 in turn. The automatic data processing system 9 determines the leakage location through the coded measuring points. The sensor signal conversion system 92 controls the power supply and measurement status of each electrode of the electrode system through the cable, and the control terminal 8 issues work instructions to the electrical sensor signal conversion system 92 through the signal line 64 and the cable line 65 of the cable 61, supplies power to the electrodes, receives, and stores Store measurement data. The data collection result is automatically stored in the control terminal 8, and the control terminal 8 transmits the original data to the computer through communication software. The computer converts the data into the data format required by the processing software. After the corresponding processing module performs preprocessing such as distortion point removal and terrain correction, the resistivity contour map is made. The contour map is used for geological interpretation based on the change characteristics of apparent resistivity combined with drilling and geological survey data, and an interpretation map of geophysical prospecting results is drawn.

[0029] As the contaminated area changes, the range of the abnormal resistance area changes accordingly, and has a good corresponding relationship. The diffusion boundary, diffusion direction and diffusion speed of the leachate contaminated area can be obtained by comparing the monitoring results of different periods.

[0030] Can carry out remote and automatic operation, real-time data collection, processing, and monitoring, can control field equipment on the network anytime and anywhere, judge the working status of field equipment in time, and remotely guide local staff, effectively reducing personnel workload and operating costs , To meet the needs of users for remote monitoring anytime and anywhere; data can be permanently stored and deleted, easy to view historical curves, and intelligent automatic control; can effectively expand the monitoring range, realize arrangement monitoring, make the collected data more comprehensive and ensure the accuracy of real-time monitoring .