CN103528763B - A kind of refuse landfill leakage detection method - Google Patents
A kind of refuse landfill leakage detection method Download PDFInfo
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- CN103528763B CN103528763B CN201310293765.4A CN201310293765A CN103528763B CN 103528763 B CN103528763 B CN 103528763B CN 201310293765 A CN201310293765 A CN 201310293765A CN 103528763 B CN103528763 B CN 103528763B
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Abstract
The present invention discloses a kind of refuse landfill leakage detection method and means of detection, and described detection method comprises the steps: the arranged outside temperature-measuring optical fiber grid in refuse landfill, connects shaping rear main frame warm with survey and is connected; Utilize the temperature outside the detection refuse landfill of temperature-measuring optical fiber grid, send temperature signal to described survey temperature main frame; Described survey temperature main frame obtains temperature detection data after temperature signal fused being processed, and then temperature detection data is transferred to data terminal; Described data terminal judges whether refuse landfill leaks after described temperature detection data and temperature normal data being contrasted; Finally utilize heat resource method that the warm field of leak position is carried out quantitative analysis, calculate spillage. The present invention is utilized to utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of different positions, monitoring and research leakage problems, can accurately provide coordinate data and the leakage at temperature anomaly position (leak location) simultaneously.
Description
Technical field
The present invention relates to a kind of Leachate site detection method and means of detection, it is specifically related to a kind of refuse landfill leakage detection method and means of detection.
Background technology
The municipal wastes annual production of current China is more than 1.5 hundred million tons, wherein 90% employing landfill method process, National Environmental detects master station and 329 household refuse landfill sites in the whole nation was carried out investigation and monitoring in 2001, what substantially reach harmless processing requirements only accounts for 15.6%, the secondary pollution of each landfill yard generally exists, wherein leakage of leachate cause ammonia nitrogen in underground water exceed standard phenomenon give prominence to. City refuse landfill life cycle is generally ten to many decades not etc., still has the maintenance phase of about 50 years after closing. Due to ageing equipment, personnel change, the reason such as cash-starved, the forewarning function of monitoring system can decline gradually, adds the factors such as external environment change, oscillating action and drain pan variation, the original impervious barrier of landfill yard can be made to produce crack, cause pollutent to be revealed, cause serious problem of environmental pollution.
When seepage of seepage-proof layer detects, electrical method is usually adopted to realize. Traditional landfill site seepage prevention layer seepage electrical detection method has two electrodes method and electrode grid method, the technological method adopted is place one or more emitting electrode in msw landfill mostly, forms current supply circuit with the receiving electrode arranged in the soil beyond landfill yard; Embedding one or more detection circuit under geomembrane, forms measure loop with away from the reference electrode in landfill district soil. By the data that each electrode gathers being analyzed, judge the position of breakthrough. What all adopt due to these methods is that Spot electrodes carries out powering and measuring, electrode limited coverage area, and each electrode is independently, it is necessary to line is to form loop separately, these methods are therefore caused to there is shortcomings such as detecting lateral resolution is low, wiring setting is comparatively complicated, detection cost height.
For solving the problem, Chinese invention patent CN102033097B discloses a kind of refuse landfill seepage electrical detection method and device, parallel in the clay seam on landfill yard geomembrane top many conductive filaments are set form Upper conductive silks, parallel in the clay seam of landfill yard geomembrane bottom many conductive filaments are set form bottom conductive filaments, and Upper conductive silk and underlying conductive silk intersect setting, form the crossing angle being greater than 0 ��; Landfill yard geomembrane top soil arranges a transmitting electrode, forms current supply circuit with underlying conductive silk; Or a transmitting electrode is set in landfill yard geomembrane underlying soil, form current supply circuit with Upper conductive silk; An electrode far away is set in away from the soil of landfill yard, forms measuring circuit with another layer of conductive filament of the conductive filament being different from current supply circuit in upper and lower layer conductive filament;
For current supply circuit is powered, if detecting there is not electric current in current supply circuit, judges that geomembrane is without leak;
If detecting there is electric current in current supply circuit, then judge that landfill yard geomembrane exists leak; Then, the conductive filament being followed successively by current supply circuit is powered, and detects the current potential of the every root conductive filament in measuring circuit successively, record multiple potential data, and potential data is carried out following process in the every root conductive filament power supply process in current supply circuit:
Setting detection zone origin position, sets up system of coordinates, it is determined that each measuring point coordinate at the grid point of crossing place that Upper conductive silk and underlying conductive silk are formed;
The potential data recorded is separately positioned on corresponding measuring point coordinate;
Drawing current potential isogram by measuring point coordinate and potential data value, the central position in current potential positive anomaly district symmetrical in isogram is the leak distributing position of geomembrane. The present invention forms electric line source by the conductive filament arranged at landfill yard, utilizes the spatial characteristics of electric line source to carry out leak detection, it is possible to effectively solve the problems such as existing detection method resolving power is low, wiring complexity, testing cost height. But landfill yard surrounding soil and underground water are mainly formed pollution by effusion, the detected result of this invention can only judge whether geomembrane leaks and leak position, and the pollution level to landfill yard surrounding soil or underground water can not be found out intuitively, comprise and pollute position and pollution range, and the leakage of effusion can not be provided.
Summary of the invention
It is an object of the present invention to provide the refuse landfill leakage detection method of the space leak location of a kind of real-time continuous detection effusion and leakage and means of detection.
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 one: at the arranged outside temperature-measuring optical fiber grid of refuse landfill, connects shaping rear main frame warm with survey and is connected;
Step 2: utilize the temperature outside the detection refuse landfill of temperature-measuring optical fiber grid, sends temperature signal to described survey temperature main frame;
Step 3: described survey temperature main frame obtains the temperature detection data that described temperature-measuring optical fiber network puts arbitrarily place after temperature signal fused being processed, then temperature detection data is transferred to data terminal;
Step 4: described data terminal if temperature detection data mates with temperature normal data, judges refuse landfill No leakage after described temperature detection data and temperature normal data being contrasted;
Step 5: if temperature detection data occurs abnormal relative to temperature normal data, then judge that leaking occurs in refuse landfill, and the measuring point coordinate corresponding to temperature detection data of this exception is leak position;
Step 6: finally utilize heat resource method to calculate the spatial distribution of pollution clouds according to temperature change amplitude, the warm field of leak position is carried out quantitative analysis, calculates spillage.
Wherein, the temperature-measuring optical fiber grid in described step one is stereoscopic grid, extends in X, Y, Z tri-directions.
Wherein, the temperature-measuring optical fiber grid in described step one is arranged in the underground water outside refuse landfill. According to hydrology tagging detection technology, utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of different positions, monitoring and research leakage problems. Because the effusion of refuse landfill is produced by the materializing procedure of complexity, than general underground water, there is higher temperature, rubbish become thoroughly decomposed produce high temperature percolate this place and periphery groundwater temperature field thereof can be made to change in the heat effect that seepage process produces, can accurately find the temperature anomaly of the underground water of landfill yard leak location, showing good coupling between seepage field and temperature field, the change therefore studying groundwater temperature field around refuse landfill can provide important references for analyzing leakage scenarios.
Wherein, the end of the temperature-measuring optical fiber grid in described step 2 is provided with optical fiber sensing device, it has the temperature profile based on the spontaneous scattering of inside of optical fibre light, and described spontaneous scattering comprises forward scatter and carries on the back to scattering, wherein carries on the back the actual meaning to scattering with temperature survey.
Wherein, the temperature detection data in described step 3 can be obtained by the conversion of following temperature demodulation formula:
Wherein, Ns(T)��Na(T) it is Si Tuokesi when temperature is T and anti-Si Tuokesi scattered light intensity; Ns(T0)��Na(T0) for temperature be T0Time Si Tuokesi and anti-Si Tuokesi scattered light intensity, by survey temperature main frame record; T0For reference temperature, determine by the calorstat temperature surveying temperature main frame; H is planck constant; K is Boltzmann constant; �� v=1.32 �� 1013Hz, �� v are the vibrational frequency of optical fiber molecule.
Wherein, in described step 2, each survey temperature point of temperature-measuring optical fiber grid is located through what optical time domain reflection technology (OTDR) realized, utilize time difference �� ti between incident light and back-scattering light and light velocity v in optical fiber, calculate the different distance X surveying temperature point distance laser light incident endi, have:
Wherein, light is the speed of light in vacuum at the velocity of propagation v=c/n of optical fiber, c, and n is optical fibre refractivity.
The present invention also provides a kind of refuse landfill leakage detection device, comprise described survey temperature main frame and the data terminal of electrical connection, described survey temperature main frame comprises Laser emission assembly, thermostat, wavelength division multiplexer, photoelectricity Signal reception/amplifier module and data gathering/treatment system, described thermostat is located on the sensor fibre connecting wavelength division multiplexer and temperature-measuring optical fiber grid, described wavelength division multiplexer is connected with data gathering/treatment system by photoelectricity Signal reception/amplifier module, and described Laser emission assembly is by data gathering/treatment system and data terminal synchronization control. In said structure, in view of the temperature-measuring optical fiber network packet built is containing multiple temperature probe node, this means of detection controls the switching between each temperature probe node by data terminal, it is achieved the circulation monitoring of temperature sensor, thus realizes the temperature detection of whole section outside refuse landfill.
Wherein, the sensor fibre connecting described Laser emission assembly and thermostat is provided with bidirectional couple device, and its output stage is connected with described wavelength division multiplexer.
Wherein, described photoelectricity Signal reception/amplifier module comprises the optical receiver and amplifier that are connected.
Wherein, Raman scattered light is decomposed into Anti-Stokes light and Stokes light by described wavelength division multiplexer.
Owing to technique scheme is used, the present invention compared with prior art has following advantage:
1. utilize the present invention to utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of different positions, monitoring and research leakage problems, can accurately provide the coordinate data at temperature anomaly position (leak location) simultaneously, have suitability widely.
2. the temperature detection data of optical fiber temperature-measurement network collection is combined by the present invention with the heat resource method of thermodynamic argument, calculates the spatial distribution of pollution clouds according to temperature change amplitude, thus provides the seepage quantitative data of pollutent.
3. the present invention utilizes temperature-measuring optical fiber network the seepage of refuse landfill to be detected, it is possible to realizing the continuous temperature measurement to measuring object and real time temperature measurement, easy construction, cheap, adaptability is good, system reliability height; Adopting optical fiber temperature-measurement technology, temperature survey is accurate, and measuring result precision has a good guarantee.
4. the present invention is based on the transmission of heat by convection model of groundwater velocity, and temperature distribution has well regular and stability, makes result of detection accurate, and repeatability is good.
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 contour curve figure of the temperature detection data utilizing the detection method of the present invention to obtain.
Description of reference numerals:
1, data terminal;
2, Laser emission assembly;
3, thermostat;
4, wavelength division multiplexer;
5, data gathering/treatment system;
6, synchronization control device;
7, bidirectional couple device;
8, optical receiver;
9, amplifier.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment one: the embodiment of the present invention provides a kind of refuse landfill leakage detection method, comprises the steps:
Step one: three-dimensional temperature-measuring optical fiber grid is set in the underground water in the outside of refuse landfill, the spacing of optical fiber requires to consider according to monitoring accuracy, being generally 20��40m, temperature-measuring optical fiber grid extends in X, Y, Z tri-directions and utilizes fused fiber splice equipment to connect shaping rear main frame warm with survey and be connected;
According to hydrology tagging detection technology, utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of different positions, monitoring and research leakage problems. Because the effusion of refuse landfill is produced by the materializing procedure of complexity, than general underground water, there is higher temperature, rubbish become thoroughly decomposed produce high temperature percolate this place and periphery groundwater temperature field thereof can be made to change in the heat effect that seepage process produces, can accurately find the temperature anomaly of the underground water of landfill yard leak location, showing good coupling between seepage field and temperature field, the change therefore studying groundwater temperature field around refuse landfill can provide important references for analyzing leakage scenarios.
Step 2: utilize the temperature outside the detection refuse landfill of temperature-measuring optical fiber grid, sends temperature signal to described survey temperature main frame;
The end of above-mentioned temperature-measuring optical fiber grid is provided with optical fiber sensing device, and it has the temperature profile based on the spontaneous scattering of inside of optical fibre light, and described spontaneous scattering comprises forward scatter and carries on the back to scattering, wherein carries on the back the actual meaning to scattering with temperature survey;
What each survey temperature of temperature-measuring optical fiber grid was put is located through what optical time domain reflection technology (OTDR) realized, utilizes time difference �� ti between incident light and back-scattering light and light velocity v in optical fiber, calculates the distance X that different survey temperature puts distance laser light incident endi, have:
Wherein, light is the speed of light in vacuum at the velocity of propagation v=c/n of optical fiber, c, and n is optical fibre refractivity.
Step 3: described survey temperature main frame obtains the temperature detection data that described temperature-measuring optical fiber network puts arbitrarily place after temperature signal fused being processed, then temperature detection data is transferred to data terminal;
Described temperature detection data can be obtained by the conversion of following temperature demodulation formula:
Wherein, Ns(T)��Na(T) it is Si Tuokesi when temperature is T and anti-Si Tuokesi scattered light intensity; Ns(T0)��Na(T0) for temperature be T0Time Si Tuokesi and anti-Si Tuokesi scattered light intensity, by survey temperature main frame record; T0For reference temperature, determine by the calorstat temperature surveying temperature main frame; H is planck constant; K is Boltzmann constant; �� v=1.32 �� 1013Hz, �� v are the vibrational frequency of optical fiber molecule.
Step 4: described data terminal if temperature detection data mates with temperature normal data, judges refuse landfill No leakage after described temperature detection data and temperature normal data being contrasted.
Step 5: if temperature detection data occurs abnormal relative to temperature normal data, then judge that leaking occurs in refuse landfill, and the measuring point coordinate corresponding to temperature detection data of this exception is leak position.
Step 6: finally utilize heat resource method to calculate the spatial distribution of pollution clouds according to temperature change amplitude, the warm field of leak position is carried out quantitative analysis, calculates spillage.
As shown in Figure 1, the embodiment of the present invention also provides a kind of refuse landfill leakage detection device, comprise survey temperature main frame and the data terminal 1 of electrical connection, described survey temperature main frame comprises Laser emission assembly 2, thermostat 3, wavelength division multiplexer 4, photoelectricity Signal reception/amplifier module and data gathering/treatment system 5, described thermostat 3 is located on the sensor fibre connecting wavelength division multiplexer 4 and temperature-measuring optical fiber grid, described wavelength division multiplexer 4 is connected with data gathering/treatment system 5 by photoelectricity Signal reception/amplifier module, described Laser emission assembly 2 realizes synchronization control by data gathering/treatment system 5 and data terminal 1 by synchronization control device 6.
In said structure, in view of the temperature-measuring optical fiber network packet built is containing multiple temperature probe node, this means of detection controls the switching between each temperature probe node by data terminal, it is achieved the circulation monitoring of temperature sensor, thus realizes the temperature detection of whole section outside refuse landfill.
The sensor fibre connecting described Laser emission assembly 2 and thermostat 3 is provided with bidirectional couple device 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 laser transmitter.
Described photoelectricity Signal reception/amplifier module comprises the optical receiver 8 and amplifier 9 that are connected. In the present embodiment, Raman scattered light is decomposed into Anti-Stokes light and Stokes light by described wavelength division multiplexer, so photoelectricity Signal reception/amplifier module is two groups, is respectively used to receive Anti-Stokes light and Stokes light.
Fig. 2 show the contour curve figure of the temperature detection data that the detection method utilizing the embodiment of the present invention one to provide obtains, and refuse landfill exists seepage between-27��-37m as seen from the figure.
The present invention is utilized to utilize temperature as the spike physical quantity of investigation refuse landfill seepage, by measuring the water temperature of different positions, monitoring and research leakage problems, can accurately provide the coordinate data at temperature anomaly position (leak location) simultaneously, have suitability widely. The temperature detection data of optical fiber temperature-measurement network collection is combined by the present invention with the heat resource method of thermodynamic argument, calculates the spatial distribution of pollution clouds according to temperature change amplitude, thus provides the seepage quantitative data of pollutent.
The above is the preferred embodiment of the present invention; it is noted that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also making some improvement or replacement, these improve or replace and also should be considered as protection scope of the present invention.
Claims (6)
1. a refuse landfill leakage detection method, it is characterised in that, comprise the steps:
Step one: at the arranged outside temperature-measuring optical fiber grid of refuse landfill, connects shaping rear main frame warm with survey and is connected;
Step 2: utilize the temperature outside the detection refuse landfill of temperature-measuring optical fiber grid, sends temperature signal to described survey temperature main frame;
Step 3: described survey temperature main frame obtains temperature detection data after temperature signal fused being processed, and then temperature detection data is transferred to data terminal;
Step 4: described data terminal if temperature detection data mates with temperature normal data, judges refuse landfill No leakage after described temperature detection data and temperature normal data being contrasted;
Step 5: if temperature detection data occurs abnormal relative to temperature normal data, then judge that leaking occurs in refuse landfill, and the measuring point coordinate corresponding to temperature detection data of this exception is leak position;
Step 6: finally utilize heat resource method that the warm field of leak position is carried out quantitative analysis, calculate spillage.
2. refuse landfill leakage detection method according to claim 1, it is characterised in that, the temperature-measuring optical fiber grid in described step one is stereoscopic grid.
3. refuse landfill leakage detection method according to claim 1, it is characterised in that, the temperature-measuring optical fiber grid in described step one is arranged in the underground water outside refuse landfill.
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 optical fiber sensing device, it has the temperature profile based on the spontaneous scattering of inside of optical fibre light, and described spontaneous scattering comprises forward scatter and carries on the back to scattering.
5. refuse landfill leakage detection method according to claim 1, it is characterised in that, the temperature detection data in described step 3 can be obtained by the conversion of following temperature demodulation formula:
Wherein, Ns(T)��Na(T) it is Si Tuokesi when temperature is T and anti-Si Tuokesi scattered light intensity; Ns(T0)��Na(T0) for temperature be T0Time Si Tuokesi and anti-Si Tuokesi scattered light intensity; T0For reference temperature; H is planck constant; K is Boltzmann constant; �� v=1.32 �� 1013Hz, �� v are the vibrational frequency of optical fiber molecule.
6. refuse landfill leakage detection method according to claim 1, it is characterized in that, in described step 2, each survey temperature point of temperature-measuring optical fiber grid is located through what optical time domain reflection technology realized, utilize time difference �� ti between incident light and back-scattering light and light velocity v in optical fiber, calculate the different distance X surveying temperature point distance laser light incident endi, have:
Wherein, light is the speed of light in vacuum at the velocity of propagation v=c/n of optical fiber, c, and n is optical fibre refractivity.
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| CN104977233B (en) * | 2015-06-19 | 2016-01-27 | 河海大学 | Hydraulic structures and basic seepage flow situation distribution type fiber-optic identification system thereof and method |
| 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 |
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| 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 |
| CN111570461B (en) * | 2020-05-29 | 2021-07-23 | 中国环境科学研究院 | Refuse landfill covering mode |
| 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 |
| CN114674454B (en) * | 2022-03-11 | 2023-03-28 | 武汉理工大学 | Concrete temperature monitoring system and method based on fiber bragg grating array sensing |
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