CN103528763A - Refuse landfill seepage detection method and detection device - Google Patents
Refuse landfill seepage detection method and detection device Download PDFInfo
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Abstract
The invention discloses a refuse landfill seepage detection method and a detection device. The detection method comprises the following steps: the external side of a refuse landfill is provided with a temperature measurement optical fiber grid which is connected with a temperature measurement host after connection molding; the temperature measurement optical fiber grid is utilized to detect temperature of the external side of the refuse landfill, and a temperature signal is sent to the temperature measurement host; the temperature signal is fused by the temperature measurement host so that temperature detection data are obtained, and the temperature detection data are transmitted to a data terminal; after the temperature detection data are compared with temperature normal data by the data terminal, whether there is leakage in the refuse landfill is judged; and finally a heat source method is utilized to quantitatively analyze a temperature field of a leakage position, and leakage amount is computed. According to the refuse landfill seepage detection method and the detection device, temperature is utilized to act as a tracing physical quantity to investigate seepage of the refuse landfill, and the seepage problem is monitored and researched via measuring water temperature of different positions. Meanwhile, coordinate data and seepage amount of a temperature abnormal position (the seepage position) can be precisely provided.
Description
Technical field
The present invention relates to a kind of drop liquid detection method and sniffer of oozing, be specifically related to a kind of refuse landfill leakage detection method and sniffer.
Background technology
China's municipal refuse annual production is over 1.5 hundred million tons at present, wherein 90% adopt landfill method to process, National Environmental detects master station and calendar year 2001 329 household refuse landfill sites in the whole nation is carried out to investigation and monitoring, what substantially reach harmless processing requirements only accounts for 15.6%, the secondary pollution ubiquity of each landfill yard, wherein leakage of leachate causes in underground water the ammonia nitrogen phenomenon that exceeds standard outstanding.City refuse landfill life cycle is generally ten to many decades not etc., still has the maintenance phase about 50 years after closing.Due to ageing equipment, personnel amendment, the reason such as cash-starved, the forewarning function of monitoring system can decline gradually, adds the factors such as external environment variation, effect of vibration and drain pan change, can make the original impervious barrier of landfill yard produce crack, cause pollutant to be revealed, cause serious problem of environmental pollution.
When seepage of seepage-proof layer detects, conventionally adopt electrical method to realize.Traditional landfill site seepage prevention layer seepage electrical detection method has bipolar electrode method and electrode grid method, the technical method adopting is in msw landfill, to place one or more emitting electrodes mostly, forms current supply circuit with the receiving electrode arranging in landfill yard soil in addition; Embedding one or more testing circuits under geomembrane, form detection loop with the contrast electrode away from landfill district soil.By the data analysis that each electrode is gathered, judge the position of breakthrough.What all adopt due to these methods is that Spot electrodes is powered and measures, electrode limited coverage area, and each electrode is independent respectively, need independent line to form loop, therefore cause these methods to exist surveying that lateral resolutions are low, wiring arrange comparatively complicated, survey high in cost of production shortcoming.
For addressing the above problem, Chinese invention patent CN102033097B discloses a kind of refuse landfill seepage electrical detection method and device, the many conductive filaments that be arranged in parallel in the clay seam on landfill yard geomembrane top form upper strata conductive filament, the many conductive filaments that be arranged in parallel in the clay seam of landfill yard geomembrane bottom form bottom conductive filament, and upper strata conductive filament and lower floor's conductive filament are arranged in a crossed manner, form the angle of the crossing that is greater than 0 °; A transmitting electrode ，Yu lower floor conductive filament is set in the soil of landfill yard geomembrane top and forms current supply circuit; Or in the soil of landfill yard geomembrane bottom, a transmitting electrode is set, form current supply circuit with upper strata conductive filament; An electrode far away is set in the soil away from landfill yard, forms measuring circuit with another layer of conductive filament that is different from the conductive filament in current supply circuit in upper and lower layer conductive filament;
For current supply circuit power supply, if current supply circuit detected, there is not electric current, judge that geomembrane is without leak;
If current supply circuit detected, there is electric current, judge that landfill yard geomembrane exists leak; Then, be followed successively by the conductive filament power supply in current supply circuit, in every conductive filament power supply process in current supply circuit, detect successively the current potential of every conductive filament in measuring circuit, record a plurality of potential datas, and potential data is carried out to following processing:
Set detection zone origin position, set up coordinate system, determine each measuring point coordinate at the grid intersection place that upper strata conductive filament and lower floor's conductive filament form;
The potential data recording is separately positioned on corresponding measuring point coordinate;
By measuring point coordinate and potential data value, draw current potential isogram, in isogram, the center in symmetrical current potential positive anomaly district is the leak distributing position of geomembrane.The present invention forms electric line source by the conductive filament arranging at landfill yard, utilizes the spatial characteristics of electric line source to carry out leak detection, can effectively solve the problems such as existing detection method resolution is low, wiring is complicated, testing cost is high.But effusion mainly forms pollution to landfill yard surrounding soil and underground water, the testing result of this invention can only judge whether geomembrane leaks and leak position, and can not find out intuitively the pollution level to landfill yard surrounding soil or underground water, comprise and pollute position and pollution range, and can not provide the leakage of effusion.
Summary of the invention
The object of the invention is to provide a kind of real-time continuous and detects the seepage position, space of effusion and refuse landfill leakage detection method and the sniffer of leakage.
For achieving the above object, the technical solution used in the present invention is: a kind of refuse landfill leakage detection method, comprises the steps:
Step 1: at the arranged outside temperature-measuring optical fiber grid of refuse landfill, be connected with thermometric main frame after connection moulding;
Step 2: utilize temperature-measuring optical fiber grid to survey the temperature in refuse landfill outside, send temperature signal to described thermometric main frame;
Step 3: described thermometric main frame will be after temperature signal fusion treatment the temperature sensing data at place, described temperature-measuring optical fiber network arbitrfary point, then by temperature sensing data transmission to data terminal;
Step 4: described data terminal, by after described temperature sensing data and the contrast of temperature normal data, if temperature sensing data are mated with temperature normal data, judges that refuse landfill is without leakage;
Step 5: abnormal if temperature sensing data occur with respect to temperature normal data, judge that leaking appears in refuse landfill, and the corresponding measuring point coordinate of these abnormal temperature sensing data is leak position;
Step 6: finally utilize heat resource method to calculate and pollute dizzy space distribution according to temperature change amplitude, the temperature of leak position is carried out to quantitative test, calculate leakage rate.
Wherein, the temperature-measuring optical fiber grid in described step 1 is stereoscopic grid, in X, Y, tri-directions of Z, extends.
Wherein, the temperature-measuring optical fiber grid in described step 1 is arranged in the underground water in refuse landfill outside.According to hydrology spike Detection Techniques, utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of diverse location, monitoring and research leakage problems.Because the effusion of refuse landfill is produced by complicated materializing procedure, than usually playing glassware for drinking water to have higher temperature, the rubbish thermal effect that the high temperature percolate that produces produces in seepage process of becoming thoroughly decomposed can make this place and periphery underground water temperature field thereof change, can accurately find the temperature anomaly of the underground water of landfill yard seepage position, between seepage field and temperature field, show good coupling, therefore study refuse landfill and descend the variation of coolant-temperature gage field to provide important references for analyzing seepage situation peripherally.
Wherein, the end of the temperature-measuring optical fiber grid in described step 2 is provided with fibre optic temperature sensor, it has the temperature characterisitic based on the spontaneous scattering of inside of optical fibre light, and described spontaneous scattering comprises forward scattering and backscattering, and wherein backscattering has thermometric practical significance.
Wherein, the temperature sensing data in described step 3 can be converted and be obtained by following temperature demodulation formula:
Wherein, N
s(T), N
a(T) Si Tuokesi and anti-Si Tuokesi scattered light intensity while being T for temperature; N
s(T
0), N
a(T
0) Si Tuokesi and anti-Si Tuokesi scattered light intensity while being T0 for temperature, by thermometric main frame, record; T0 is reference temperature, by the calorstat temperature of thermometric main frame, is determined; H is Planck constant; K is Boltzmann constant; Δ v=1.32 * 1013Hz, Δ v is the vibration frequency of optical fiber molecule.
Wherein, in described step 2, realize by optical time domain reflection technology (OTDR) location of each point for measuring temperature of temperature-measuring optical fiber grid, the mistiming Δ ti and the interior light velocity v of optical fiber that utilize incident light and back-scattering light only to see, calculate different points for measuring temperature distances and swash the distance X i of light incident side, has:
Wherein, light is at the velocity of propagation v=c/n of light, and c is light speed in a vacuum, and n is optical fibre refractivity.
The present invention also provides a kind of refuse landfill leakage detection device, the described thermometric main frame and the data terminal that comprise electrical connection, described thermometric main frame comprises Laser emission assembly, thermostat, wavelength division multiplexer, photosignal reception/amplifier module and Data Acquisition System, described thermostat is located on the sensor fibre that connects wavelength division multiplexer and temperature-measuring optical fiber grid, described wavelength division multiplexer is connected with Data Acquisition System by receive/amplifier module of photosignal, and described Laser emission assembly is by Data Acquisition System and data terminal synchro control.In said structure, in view of the temperature-measuring optical fiber network packet building is containing a plurality of temperature sensing nodes, this sniffer is controlled the switching between each temperature sensing node by data terminal, realizes the circulatory monitoring of temperature sensor, thereby realizes the temperature sensing of whole section outside refuse landfill.
Wherein, the sensor fibre that connects described Laser emission assembly and thermostat is provided with bidirectional coupler, and its output stage is connected with described wavelength division multiplexer.
Wherein, described photosignal reception/amplifier module comprises optical receiver and the amplifier being connected.
Wherein, Raman scattered light is decomposed into Anti-Stokes light and Stokes light by described wavelength division multiplexer.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1. utilize the present invention to utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of diverse location, monitoring and research leakage problems, the while can accurately provide the coordinate data of temperature anomaly position (seepage position), has applicability widely.
2. the temperature sensing data that the present invention collects optical fiber temperature-measurement network combine with the heat resource method of thermodynamic argument, according to temperature change amplitude, calculate the space distribution that pollution is dizzy, thereby provide the seepage quantitative data of pollutant.
3. the present invention utilizes temperature-measuring optical fiber network to survey the seepage of refuse landfill, can realize the continuous temperature measurement of measuring object and real time temperature measurement, and easy construction, cheap, adaptability is good, and system dependability is high; Adopt Fiber Optic Pyrometer, temperature survey is accurate, and measurement result precision has good guarantor to levy.
4. the convection heat transfer' heat-transfer by convection model that the present invention is based on groundwater velocity, Temperature Distribution has good regularity and stability, makes result of detection accurate, and reproducible.
Accompanying drawing explanation
Fig. 1 is the principle of work block diagram of leakage detection device in the embodiment of the present invention one;
Fig. 2 is the equivalent curve figure that utilizes the temperature sensing data of detection method acquisition of the present invention.
Description of reference numerals:
1, data terminal;
2, Laser emission assembly;
3, thermostat;
4, wavelength division multiplexer;
5, Data Acquisition System;
6, isochronous controller;
7, bidirectional coupler;
8, optical receiver;
9, amplifier.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment mono-: the embodiment of the present invention provides a kind of refuse landfill leakage detection method, comprises the steps:
Step 1: in the underground water in the outside of refuse landfill, three-dimensional temperature-measuring optical fiber grid is set, the spacing of optical fiber requires to consider according to monitoring accuracy, be generally 20～40m, temperature-measuring optical fiber grid is connected with thermometric main frame after X, Y, tri-directions of Z are extended and utilized fused fiber splice equipment to connect moulding;
According to hydrology spike Detection Techniques, utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of diverse location, monitoring and research leakage problems.Because the effusion of refuse landfill is produced by complicated materializing procedure, than usually playing glassware for drinking water to have higher temperature, the rubbish thermal effect that the high temperature percolate that produces produces in seepage process of becoming thoroughly decomposed can make this place and periphery underground water temperature field thereof change, can accurately find the temperature anomaly of the underground water of landfill yard seepage position, between seepage field and temperature field, show good coupling, therefore study refuse landfill and descend the variation of coolant-temperature gage field to provide important references for analyzing seepage situation peripherally.
Step 2: utilize temperature-measuring optical fiber grid to survey the temperature in refuse landfill outside, send temperature signal to described thermometric main frame;
The end of above-mentioned temperature-measuring optical fiber grid is provided with fibre optic temperature sensor, and it has the temperature characterisitic based on the spontaneous scattering of inside of optical fibre light, and described spontaneous scattering comprises forward scattering and backscattering, and wherein backscattering has thermometric practical significance;
Realize by optical time domain reflection technology (OTDR) location of each point for measuring temperature of temperature-measuring optical fiber grid, and the mistiming Δ ti and the interior light velocity v of optical fiber that utilize incident light and back-scattering light only to see, calculate different points for measuring temperature distances and swash the distance X i of light incident side, has:
Wherein, light is at the velocity of propagation v=c/n of light, and c is light speed in a vacuum, and n is optical fibre refractivity.
Step 3: described thermometric main frame will be after temperature signal fusion treatment the temperature sensing data at place, described temperature-measuring optical fiber network arbitrfary point, then by temperature sensing data transmission to data terminal;
Described temperature sensing data can be converted and be obtained by following temperature demodulation formula:
Wherein, N
s(T), N
a(T) Si Tuokesi and anti-Si Tuokesi scattered light intensity while being T for temperature; N
s(T
0), N
a(T
0) Si Tuokesi and anti-Si Tuokesi scattered light intensity while being T0 for temperature, by thermometric main frame, record; T0 is reference temperature, by the calorstat temperature of thermometric main frame, is determined; H is Planck constant; K is Boltzmann constant; Δ v=1.32 * 1013Hz, Δ v is the vibration frequency of optical fiber molecule.
Step 4: described data terminal, by after described temperature sensing data and the contrast of temperature normal data, if temperature sensing data are mated with temperature normal data, judges that refuse landfill is without leakage.
Step 5: abnormal if temperature sensing data occur with respect to temperature normal data, judge that leaking appears in refuse landfill, and the corresponding measuring point coordinate of these abnormal temperature sensing data is leak position.
Step 6: finally utilize heat resource method to calculate and pollute dizzy space distribution according to temperature change amplitude, the temperature of leak position is carried out to quantitative test, calculate leakage rate.
As shown in Figure 1, the embodiment of the present invention also provides a kind of refuse landfill leakage detection device, the thermometric main frame and the data terminal 1 that comprise electrical connection, described thermometric main frame comprises Laser emission assembly 2, thermostat 3, wavelength division multiplexer 4, photosignal reception/amplifier module and Data Acquisition System 5, described thermostat 3 is located on the sensor fibre that connects wavelength division multiplexer 4 and temperature-measuring optical fiber grid, described wavelength division multiplexer 4 is connected with Data Acquisition System 5 by receive/amplifier module of photosignal, described Laser emission assembly 2 is realized synchro control by Data Acquisition System 5 and data terminal 1 by isochronous controller 6.
In said structure, in view of the temperature-measuring optical fiber network packet building is containing a plurality of temperature sensing nodes, this sniffer is controlled the switching between each temperature sensing node by data terminal, realizes the circulatory monitoring of temperature sensor, thereby realizes the temperature sensing of whole section outside refuse landfill.
The sensor fibre that connects described Laser emission assembly 2 and thermostat 3 is provided with bidirectional coupler 7, and its output stage is connected with described wavelength division multiplexer 4.
In the present embodiment, described data terminal 1 is microcomputer; Described Laser emission assembly 2 is generating laser.
Described photosignal reception/amplifier module comprises optical receiver 8 and the amplifier 9 being connected.In the present embodiment, Raman scattered light is decomposed into Anti-Stokes light and Stokes light by described wavelength division multiplexer, so photosignal reception/amplifier module is two groups, is respectively used to receive Anti-Stokes light and Stokes light.
Figure 2 shows that the equivalent curve figure that utilizes the temperature sensing data that detection method that the embodiment of the present invention one provides obtains, there is seepage in refuse landfill as seen from the figure between-27～-37m.
Utilize the present invention to utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of diverse location, monitoring and research leakage problems, the while can accurately provide the coordinate data of temperature anomaly position (seepage position), has applicability widely.The temperature sensing data that the present invention collects optical fiber temperature-measurement network combine with the heat resource method of thermodynamic argument, according to temperature change amplitude, calculate the space distribution that pollution is dizzy, thereby provide the seepage quantitative data of pollutant.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of principle of the present invention; can also make some improvement or replacement, these improvement or replacement also should be considered as protection scope of the present invention.
Claims (10)
1. a refuse landfill leakage detection method, is characterized in that, comprises the steps:
Step 1: at the arranged outside temperature-measuring optical fiber grid of refuse landfill, be connected with thermometric main frame after connection moulding;
Step 2: utilize temperature-measuring optical fiber grid to survey the temperature in refuse landfill outside, send temperature signal to described thermometric main frame;
Step 3: described thermometric main frame will be after temperature signal fusion treatment temperature sensing data, then by temperature sensing data transmission to data terminal;
Step 4: described data terminal, by after described temperature sensing data and the contrast of temperature normal data, if temperature sensing data are mated with temperature normal data, judges that refuse landfill is without leakage;
Step 5: abnormal if temperature sensing data occur with respect to temperature normal data, judge that leaking appears in refuse landfill, and the corresponding measuring point coordinate of these abnormal temperature sensing data is leak position;
Step 6: finally utilize heat resource method to carry out quantitative test to the temperature of leak position, calculate leakage rate.
2. refuse landfill leakage detection method according to claim 1, is characterized in that, the temperature-measuring optical fiber grid in described step 1 is stereoscopic grid.
3. refuse landfill leakage detection method according to claim 1, is characterized in that, the temperature-measuring optical fiber grid in described step 1 is arranged in the underground water in refuse landfill outside.
4. refuse landfill leakage detection method according to claim 1, it is characterized in that, the end of the temperature-measuring optical fiber grid in described step 2 is provided with fibre optic temperature sensor, it has the temperature characterisitic based on the spontaneous scattering of inside of optical fibre light, and described spontaneous scattering comprises forward scattering and backscattering.
5. refuse landfill leakage detection method according to claim 1, is characterized in that, the temperature sensing data in described step 3 can be converted and be obtained by following temperature demodulation formula:
Wherein, N
s(T), N
a(T) Si Tuokesi and anti-Si Tuokesi scattered light intensity while being T for temperature; N
s(T
0), N
a(T
0) Si Tuokesi and anti-Si Tuokesi scattered light intensity while being T0 for temperature; T0 is reference temperature; H is Planck constant; K is Boltzmann constant; Δ v=1.32 * 1013Hz, Δ v is the vibration frequency of optical fiber molecule.
6. refuse landfill leakage detection method according to claim 1, it is characterized in that, in described step 2, realize by optical time domain reflection technology the location of each point for measuring temperature of temperature-measuring optical fiber grid, the mistiming Δ ti and the interior light velocity v of optical fiber that utilize incident light and back-scattering light only to see, calculate different point for measuring temperature distances and swash the distance X i of light incident side, have:
Wherein, light is at the velocity of propagation v=c/n of light, and c is light speed in a vacuum, and n is optical fibre refractivity.
7. a refuse landfill leakage detection device, it is characterized in that, the described thermometric main frame and the data terminal that comprise electrical connection, described thermometric main frame comprises Laser emission assembly, thermostat, wavelength division multiplexer, photosignal reception/amplifier module and Data Acquisition System, described thermostat is located on the sensor fibre that connects wavelength division multiplexer and temperature-measuring optical fiber grid, described wavelength division multiplexer is connected with Data Acquisition System by receive/amplifier module of photosignal, and described Laser emission assembly is by Data Acquisition System and data terminal synchro control.
8. refuse landfill leakage detection device according to claim 7, is characterized in that, the sensor fibre that connects described Laser emission assembly and thermostat is provided with bidirectional coupler, and its output stage is connected with described wavelength division multiplexer.
9. refuse landfill leakage detection device according to claim 7, is characterized in that, described photosignal reception/amplifier module comprises optical receiver and the amplifier being connected.
10. refuse landfill leakage detection device according to claim 7, is characterized in that, Raman scattered light is decomposed into Anti-Stokes light and Stokes light by described wavelength division multiplexer.
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| CN105115675A (en) * | 2015-09-11 | 2015-12-02 | 中国石油化工股份有限公司 | Leakage detection system for buried double-layer oil tank interlayer |
| WO2016201967A1 (en) * | 2015-06-19 | 2016-12-22 | 河海大学 | Hydraulic structure, and system and method for identifying distributed optical fiber for base seepage condition thereof |
| CN107219019A (en) * | 2017-07-06 | 2017-09-29 | 中国海洋石油总公司 | LNG storage tank perlite sedimentation monitoring system and method based on distribution type fiber-optic |
| CN107462689A (en) * | 2017-08-24 | 2017-12-12 | 新疆国利衡清洁能源科技有限公司 | Calibration system and calibration method for coal underground gasification gas dissipation boundary |
| CN108151908A (en) * | 2017-12-18 | 2018-06-12 | 南通职业大学 | A kind of architectural engineering roof leakage detection method |
| CN108760162A (en) * | 2018-05-23 | 2018-11-06 | 北京目黑科技有限公司 | leakage detection device and method |
| CN111570461A (en) * | 2020-05-29 | 2020-08-25 | 中国环境科学研究院 | Refuse landfill covering mode |
| CN112964423A (en) * | 2021-02-02 | 2021-06-15 | 浙江大学 | Landfill vulnerability positioning device and method based on combinable optical fiber thermal response |
| CN114674454A (en) * | 2022-03-11 | 2022-06-28 | 武汉理工大学 | Concrete temperature monitoring system and method based on fiber grating array sensing |
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| WO2016201967A1 (en) * | 2015-06-19 | 2016-12-22 | 河海大学 | Hydraulic structure, and system and method for identifying distributed optical fiber for base seepage condition thereof |
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| CN105115675A (en) * | 2015-09-11 | 2015-12-02 | 中国石油化工股份有限公司 | Leakage detection system for buried double-layer oil tank interlayer |
| CN107219019A (en) * | 2017-07-06 | 2017-09-29 | 中国海洋石油总公司 | LNG storage tank perlite sedimentation monitoring system and method based on distribution type fiber-optic |
| CN107219019B (en) * | 2017-07-06 | 2023-07-25 | 中国海洋石油集团有限公司 | LNG storage tank perlite settlement monitoring system and method based on distributed optical fibers |
| CN107462689A (en) * | 2017-08-24 | 2017-12-12 | 新疆国利衡清洁能源科技有限公司 | Calibration system and calibration method for coal underground gasification gas dissipation boundary |
| CN108151908A (en) * | 2017-12-18 | 2018-06-12 | 南通职业大学 | A kind of architectural engineering roof leakage detection method |
| CN108760162A (en) * | 2018-05-23 | 2018-11-06 | 北京目黑科技有限公司 | leakage detection device and method |
| CN111570461A (en) * | 2020-05-29 | 2020-08-25 | 中国环境科学研究院 | Refuse landfill covering mode |
| CN111570461B (en) * | 2020-05-29 | 2021-07-23 | 中国环境科学研究院 | Refuse landfill covering mode |
| CN112964423A (en) * | 2021-02-02 | 2021-06-15 | 浙江大学 | Landfill vulnerability positioning device and method based on combinable optical fiber thermal response |
| CN112964423B (en) * | 2021-02-02 | 2022-07-15 | 浙江大学 | Landfill vulnerability positioning device and method based on combinable optical fiber thermal response |
| CN114674454A (en) * | 2022-03-11 | 2022-06-28 | 武汉理工大学 | Concrete temperature monitoring system and method based on fiber grating array sensing |
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