CN103033540A - Real-time automatic monitoring method and real-time automatic monitoring system for underground light non-aqueous phase liquid pollutant dispersion - Google Patents
Real-time automatic monitoring method and real-time automatic monitoring system for underground light non-aqueous phase liquid pollutant dispersion Download PDFInfo
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Abstract
The invention provides a real-time automatic monitoring method and a real-time automatic monitoring system for underground light non-aqueous phase liquid pollutant dispersion. The method comprises the following steps: taking a monitoring point location; obtaining a resistance variation range E after characteristic LNAPLs pollutant and characteristic LNAPLs pollution is caused at the monitoring point location; determining the length of a resistance probe; determining a distance between electrode rings; hanging one set of resistance monitoring device in a monitoring well according to an underground water flow direction; respectively injecting at least one set of resistance monitoring device at monitoring point locations upstream and downstream underground water; setting collecting parameters; transmitting monitoring data in real time; and automatically alarming when the resistance reaches the lower limit of the E. The real-time automatic monitoring method provided by the invention has the advantages of simple operation, accurate measurement and reliable operation; data can be monitored in real time and wirelessly transmitted; the diffusion process of the LNAPLs after leaking can be dynamically monitored in real time; the redistribution process of the LNAPLs can be also monitored during extracting rainfall or underground water; and the real-time automatic monitoring method provided by the invention can be widely applied to dynamic monitoring of underground pollution after the LNAPLs is leaked in large-scale petrochemical enterprises, gas stations and so on.
Description
Technical field
The invention belongs to the environmental monitoring technology field, particularly the real-time automatic monitoring method and system of a kind of underground light nonaqueous phase fluid contaminants (LNAPLs) diffusion.
Background technology
Underground water is the important component part of water resource, because the water yield is stable, water quality is good, is one of the important water source in agricultural irrigation, industrial and mineral and city, however lasting flourish along with industry, and underground water just meets with serious Pollution Crisis.At present worldwide, the underground pollution of organic contaminant more and more comes into one's own.The overwhelming majority solubleness of organic contaminants in water is very little, does not melt mutually mutually with water and air and exists with the form of liquid phase underground, and being generally called under study for action this pollutant is nonaqueous phase liquid, i.e. NAPLs (non-aqueous phase liquids); Being called that wherein density ratio water is large weighs nonaqueous phase liquid, i.e. DNAPLs (dense non-aqueous phase liquids); Density ratio water is little is called light nonaqueous phase liquid, i.e. LNAPLs(light non-aqueous phase liquids).Heavy nonaqueous phase liquid common are high malicious chlorinated solvents (such as triclene TCE, zellon PCE, methenyl choloride TCA), coal tar, phenixin, chloroform, methylene chloride etc.; Light nonaqueous phase liquid such as fuel oils common are gasoline, diesel oil, kerosene, benzene class such as dimethylbenzene, toluene, benzene etc.
China is in the period of rapid economic development, and various petrochemical industry series products are widely used, and can cause evaporating, emitting, dripping or leaking of liquid or gas unavoidably in production, storage, use and transportation, thereby pollutes underground environment.Light nonaqueous phase pollutant because and the water unmixing, toxicity is large, be difficult for degraded, there is lag-effect in the pollution that underground porous medium is caused, become the long-time pollution source of underground water, there are the harm that is difficult to estimate in existence and life to the mankind, therefore its diffusion are monitored, and it is necessary to take measures in time to prevent that it from further polluting.At present utilize in the world the methods such as tracer method, non-invasion image method and TDR to come the spatial variations process of dynamic monitoring pollutant, obtained certain effect.The domestic scholar of having adopts respectively the biomass indexes monitoring, and ultraviolet light electrical method and resistivity image method are realized the dynamic monitoring of light nonaqueous phase liquid.Sum up above method, be by measuring underground light nonaqueous phase and pollute the dielectric object Physicochemical change of properties that causes, and then come the dynamic pollution course of intermediate description pollutant by the variation of third party's object (instrument, biology, chemical substance) different parameters.Tracer method and biomass indexes monitoring method need timing sampling to carry out the shop experiment analysis, and test operation is complicated, and the cycle is long, omit easily for important pollution course, the migration position of reaction contaminant that can not be promptly and accurately; TDR method and ultraviolet light electrical method cost are high, complicated operation.The resistivity image method is a kind of of non-invasion image method, uses comparatively extensively, and cost is low, but existing resistivity monitoring technology has the deficiency that can't realize long-term real-time automatic monitoring.
For above problem, the inventor once did simulation laboratory test, and deliver the theory of correlation literary composition, but paper has only been studied the feasibility of LNAPLs Vertical Migration in the resistivity method monitoring homogeneous sand, and be single-spot testing, do not relate to monitoring system and pollute automatically identification and definite function and the step of migration three dimensions scope.
Summary of the invention
High for solving existing monitoring method cost, complicated operation, can not Real-Time Monitoring etc. problem, the invention provides a kind of real-time automatic monitoring method and system of underground light nonaqueous phase fluid contaminants diffusion, but LNAPLs redistribution process when the diffusion process after real-time dynamic monitoring LNAPLs leaks and rainfall or groundwater mining.
The real-time automatic monitoring method of underground light nonaqueous phase liquid Pollutants Diffusion comprises:
1) monitors to determine to monitor the suspicious pollution source zone in area and the monitoring site of suspicious pollution source according to simulation and forecast or conventional underground water water sample; And obtain and monitor regional feature LNAPLs pollutant;
It is characterized in that may further comprise the steps:
2) choose on-the-spot underground water and the pedotheque of each monitoring site, carry out resistivity and survey pollution migration analog monitoring, checking is to the applicability of this monitoring site, if the soil moisture content of this monitoring site has adaptability greater than 5%, and obtain the resistivity range of variation E of feature LNAPLs pollution after each has adaptive monitoring site generation
i, i ∈ M, M are the quantity with adaptive monitoring site;
3) according to the change in depth scope of the underground water of monitoring site, choose the feeler lever length of specific resistance monitoring device; Choose the spacing of resistivity feeler lever upper electrode rings according to required detection accuracy; For example WATER LEVEL CHANGES-10m～-the 11m scope in, then the length of resistivity feeler lever should 11m.
4) water (flow) direction under the base area, the monitoring site injection one cover specific resistance monitoring device that in suspicious pollution source area, has underground water to be monitored, as the first monitoring site, distinguishing at least injection one cover specific resistance monitoring device apart from the monitoring site that is positioned at the underground water upstream and downstream in this cover monitoring device 400～600m scope; And the GPRS antenna of specific resistance monitoring device is elevated above the soil.
Distinguish at least injection one cover specific resistance monitoring device in groundwater flow direction both sides and apart from the position of the first monitoring site 200～300m; Pollute more seriously district for LNAPLs, can encrypt feeler lever and lay, be the feeler lever that " cross " distributes but must not be less than 5, otherwise be not enough to draw the three-dimensional data of polluting the space.
In order further to guarantee measurement effect, its improved plan is as follows: at first, excavating a vertical shaft directly over the underground water in the monitored area, this vertical shaft is communicated with underground water, as the groundwater monitoring well, also is the first monitoring site with this vertical shaft; Then in this monitor well, hang a cover specific resistance monitoring device; Distinguishing at least injection one cover specific resistance monitoring device apart from the monitoring site that is positioned at the underground water upstream and downstream in this monitor well 400～600m scope; And the GPRS antenna of specific resistance monitoring device is elevated above the soil; Feeler lever length in the well should guarantee that it probes into below the water surface at least 20cm; And distinguish at least injection one cover specific resistance monitoring device in groundwater flow direction both sides and apart from the position of this monitor well 200～300m.
Owing to descend circumstance complication practically, the soil texture is different, for optimizing rig-site utilization, on resistivity feeler lever top Matching Bits is set, and adopts the auger drill head revolution to pierce for cohesive soil, adopts the taper bit hammering to pierce for silt and sand.
5) acquisition parameter is set, comprises the specific resistance monitoring device that select to open is used for monitoring, and the electrode retaining collar number that gathers of frequency acquisition and being used for; Resistivity situation to the scene is carried out Real-time Collection, and with the resistivity upload server that collects.
6) obvious, the monitored area is uncontaminated zone at initial time, after sniffer is buried underground, with record regional uncontaminated the time data be worth as a setting, the data communication device that real-time Transmission is returned is crossed and the background value contrast, if resistivity reaches certain monitoring site E
jLower limit, namely work as the change in resistance rate ε that receives
j∈ E
jThe time, then automatically be identified as and LNAPLs occur and pollute, report to the police simultaneously, and alarming short message is sent to given client.Wherein, j ∈ N, N are the quantity of specific resistance monitoring device, ε
jRepresent the change in resistance value that j specific resistance monitoring device records.
7) after the LNAPLs pollution appearred in system identification, the host computer data processing module can start corresponding program automatically, drew resistivity curve and the preservation of each monitoring point.
8) analyze the resistivity curve that pollutes rear certain moment, obtain LNAPLs migration forward reached position, and the LNAPLs pollution depth scope of monitoring site, be referred to as peak strip, comprehensive each monitoring site migration forward position, thus real-time three-dimensional space-pollution scope obtained.
Definite method that above-mentioned feature LNAPLs pollutes the resistivity range of variation E after certain monitoring site occurs is as follows:
Get the on-the-spot uncontaminated soil sample of monitoring site and sampling of ground water, utilize acquired feature LNAPLs pollutant, oils for example, change in resistance rate score scope when determining that monitoring site is subject to this feature LNAPLs and pollutes, when pollutant levels surpass the minimum limit value of national Specification, be defined as soil and polluted, when the soil pollution thing reaches capacity state, be the pollution upper limit.
The real-time automatic monitoring system of underground light nonaqueous phase liquid Pollutants Diffusion, comprise the resistivity detection system that realizes detection, data acquisition and wireless communication functions, and realization sends instruction, data receiver, identification is polluted and reached the host computer that shows in real time with auto-alarm function automatically
It is characterized in that described resistivity detection system comprises at least five specific resistance monitoring devices, described specific resistance monitoring device comprises the resistivity feeler lever and is arranged on the equipment compartment at resistivity feeler lever top, be provided with GPRS wireless transport module and Data Control module in this equipment compartment, and extending equipment GPRS antenna out of my cabin; Described resistivity feeler lever is the cylindrical structural body that outside surface is provided with at least 4 electrode retaining collars equally spacedly, and described electrode retaining collar is connected with the Data Control module via the wire that is positioned at cylindrical structural body inside;
Described host computer comprises the server that includes the client control program, and the warning device that is connected with server; Described client control program is used for arranging parameter, transmission data acquisition instruction, remote synchronization transmission of monitoring data, the automatic identification of resistivity detection system and pollutes, shows the rear in real time resistivity curve of pollution, and sends alerting signal to warning device; Described client control program is by the communication of ICP/IP protocol realization with the resistivity detection system.
The cylindrical structural body of the hollow that the tubulose nylon module grafting that above-mentioned resistivity feeler lever is hollow forms, and copper electrode retaining collar clip is arranged between adjacent two modules, have wire that described copper electrode retaining collar is connected with the Data Control module in cylindrical structural body inside, and filling have epoxy resin adhesive in the cylindrical structural body of hollow.
The present invention is directed to above problem and made effective improvement, not only realized the pollution automatic discrimination, and can obtain polluting the underground three-dimensional spatial distribution of rear any time, realized the pollution Real-Time Monitoring in the three dimensions.
Monitoring method of the present invention is simple to operate, measurement is accurate, reliable, can realize Real-Time Monitoring and wirelessly transmitting data, but diffusion process after real-time dynamic monitoring NAPLs leaks.This method can be determined pollution range by polluting forward's progradation, therefore can be widely used in the underground pollution dynamic monitoring after the NAPLs such as large petrochemical plant, refuelling station leak.Monitoring system of the present invention can a center monitoring computer control be overlapped on-the-spot pollution monitoring device more, and multi-group data receives simultaneously, realizes the multiple spot monitoring; Can realize wireless bidirectional communication, support long-time online that can realize that long-term unmanned monitors automatically, data are preserved automatically; Hardware components can be made to measure as required, and system configuration is flexible, has reduced cost.
Description of drawings
Fig. 1 is the on-the-spot artwork of monitoring system of the present invention.
Fig. 2 is monitoring method implementing procedure figure of the present invention.
Fig. 3 is monitoring system working routine of the present invention.
Fig. 4 is monitoring site background resistivity value (signal has 5 place's points position among the figure).
It is rear along water (flow) direction monitoring site measured resistivity value and migration peak strip that Fig. 5 identifies pollution.
Transverse to the flow direction monitoring site measured resistivity value and migration peak strip after Fig. 6 identifies and pollutes.
Wherein, 1, drill bit, 2, feeler lever, 3, electrode retaining collar, 4, equipment compartment, 5, GPRS antenna, 6, host computer, 7, long distance wireless transmission, 8, underground water table, 9, monitor well, 10, groundwater flow, 11, aeration zone, 12, zone of saturation, 13, the LNAPLs phacoid, 14, oil pipeline, 15, storage tank.
Embodiment
Shown in Fig. 1～3, the real-time automatic monitoring method of underground light nonaqueous phase liquid Pollutants Diffusion comprises:
1) monitors to determine to monitor the suspicious pollution source zone in area and the monitoring site of suspicious pollution source according to simulation and forecast or conventional underground water water sample; And obtain and monitor regional feature LNAPLs pollutant;
It is the practicality that choosing of monitoring site is directly connected to monitoring result that feeler lever is buried a position underground.The existing Groundwater Environmental Quality investigation of investigation and appraisal report, choosing the LNAPLs recall rate is main monitoring point than current downstream, high pollution source groundwater protection target, its upstream and downstream and two side positions are as the auxiliary monitoring point; If the tank station, then choosing monitoring site in the downstream of underground water is most critical;
2) choose on-the-spot underground water and the pedotheque of monitoring site, carry out resistivity and survey and pollute the migration analog monitoring, checking is to the applicability of this monitoring site, if the soil moisture content of this monitoring site has adaptability greater than 5%; And obtain the change in resistance rate scope E of LNAPLs pollution after this monitoring site occurs, as follows:
Get the on-the-spot uncontaminated soil sample of monitoring site and sampling of ground water, utilize acquired feature LNAPLs pollutant, oils for example, change in resistance rate score scope when determining that monitoring site is subject to this feature LNAPLs and pollutes, when pollutant levels surpass the minimum limit value of national Specification, be defined as soil and polluted, when the soil pollution thing reaches capacity state, be the pollution upper limit.The pollution course resistivity range of variation is as follows:
Be designated as E=(min (ε
i), max (ε
i)),
Wherein, E is change in resistance rate scope after polluting,
ε
iBe the change in resistance rate that LNAPLs Pollutants Diffusion rear electrode ring i place records, i is certain electrode retaining collar on the analog monitoring device;
ρ
tBe the stable rear t moment resistivity measurements of LNAPLs diffusion process, t belongs to a certain moment of analog monitoring on the time period;
ρ
0Be underground medium resistivity background value;
3) according to the change in depth scope of the underground water of monitoring site, choose the feeler lever length of specific resistance monitoring device; Choose the spacing of resistivity feeler lever upper electrode rings according to required detection accuracy; For example WATER LEVEL CHANGES-10m～-the 11m scope in, then the length of resistivity feeler lever should 11m.
The adjacent electrode ring spacing is according to the measuring accuracy setting, and I is set to 5mm; According to the required investigation depth to ground from underground water and electrode retaining collar spacing (being detection accuracy) but determine the number N1 of measurement point position; If the degree of depth that needs to measure is from bottom to top corresponding to N2 measurement point, according to Wenner measurement device principle, required working electrode number N3 is that N2 adds 3, i.e. N3=N2+3; Therefore required electrode retaining collar number is N1+3 altogether.
4) according to groundwater flow 10 directions, the monitoring site injection one cover specific resistance monitoring device that has underground water to be monitored in suspicious pollution source area is being distinguished at least injection one cover specific resistance monitoring device apart from the monitoring site that is positioned at the underground water upstream and downstream in this cover monitoring device 400～600m scope; Distinguish at least injection one cover specific resistance monitoring device in groundwater flow direction both sides and apart from the position of groundwater protect district monitoring site both sides 200～300m; And the GPRS antenna 5 of specific resistance monitoring device is elevated above the soil.
In order further to guarantee measurement effect, its improved plan is as follows: at first, excavate a vertical shaft directly over the underground water in the monitored area, this vertical shaft communicated with underground water, with this vertical shaft as groundwater monitoring well 9; Then in this monitor well, hang a cover specific resistance monitoring device; Distinguishing at least injection one cover specific resistance monitoring device apart from the monitoring site that is positioned at the underground water upstream and downstream in this monitor well 400～600m scope; And the GPRS antenna 5 of specific resistance monitoring device is elevated above the soil; Feeler lever length in the well should guarantee that it probes into below the water surface at least 20cm; And distinguishing at least injection one cover specific resistance monitoring device apart from these monitor well both sides 200～300m.The scheme of utilizing monitor well to monitor is particularly important for large petrochemical plant.
Investigate process LNAPLs for data and pollute more seriously district, can encrypt feeler lever and lay, namely arrange along water (flow) direction and perpendicular to water (flow) direction is latticed how the group feeler levers are measured simultaneously.
5) acquisition parameter is set, comprises the specific resistance monitoring device that select to open is used for monitoring, and the electrode retaining collar number that gathers of frequency acquisition and being used for; Resistivity situation to the scene is carried out Real-time Collection, and with the resistivity upload server that collects.
6) the real-time Transmission data communication device of returning is crossed and the background value contrast, if resistivity reaches the lower limit of E, namely works as the change in resistance rate ε that receives
iDuring ∈ E, then monitoring system is identified pollution automatically; Report to the police simultaneously, and warning message is sent to given client.
7) after the LNAPLs pollution appears in system identification, manifest in real time resistivity curve and the preservation of drawing each monitoring point by data processing software;
8) analyze the resistivity curve that pollutes rear certain moment, can get the contaminant peak value band of each monitoring site and pollute monitoring site that the forward arrives by curve, obtain LNAPLs migration forward reached position, and the LNAPLs pollution depth scope of monitoring site, be referred to as peak strip, comprehensive each monitoring site migration forward position, thus real-time three-dimensional space-pollution scope obtained.
The real-time automatic monitoring system of underground light nonaqueous phase liquid Pollutants Diffusion of the present invention, comprise the resistivity detection system that realizes detection, data acquisition and wireless communication functions, and realize sending instruction, data receiver, show in real time the host computer 6 with auto-alarm function
It is characterized in that described resistivity detection system comprises at least five specific resistance monitoring devices, described specific resistance monitoring device comprises resistivity feeler lever 2 and is arranged on the equipment compartment 4 at resistivity feeler lever 2 tops, be provided with GPRS wireless transport module and Data Control module in this equipment compartment 4, and extending equipment GPRS antenna 5 out of my cabin; Described resistivity feeler lever 2 is cylindrical structural bodies that outside surface is provided with at least 4 electrode retaining collars 3 equally spacedly, and described electrode retaining collar 3 is connected with the Data Control module via the wire that is positioned at cylindrical structural body inside;
Described host computer 6 comprises the server that includes the client control program, and the warning device that is connected with server; Described client control program is used for arranging parameter, transmission data acquisition instruction, remote synchronization transmission of monitoring data, the automatic identification of resistivity detection system and pollutes, shows the rear in real time resistivity curve of pollution, and sends alerting signal to warning device; Described client control program is by the communication of ICP/IP protocol realization with the resistivity detection system.
The cylindrical structural body of the hollow that the tubulose nylon module grafting that above-mentioned resistivity feeler lever 2 is hollow forms, and copper electrode retaining collar 3 clips are arranged between adjacent two modules, have wire that described copper electrode retaining collar 3 is connected with the Data Control module in cylindrical structural body inside, and filling have epoxy resin adhesive in the cylindrical structural body of hollow.
As shown in Figure 1; oil pipeline 14 may cause groundwater pollution because of leakage with oil storage tank 15; the place excavates vertical shaft as monitor well 9 in groundwater protection target monitoring point position; the direction of groundwater flow 10 can obtain by the routine exploration; because proportion is less than water; LNAPLs phacoid 13 is positioned at the aeration zone 11 on the underground water table 8, has a small amount of LNAPLs dissolving and enters in the zone of saturation 12.Feeler lever 2 in the monitor well 9 does not need drill bit 1, is provided with electrode retaining collar 3 outside the feeler lever 2, and feeler lever 2 tops are the equipment compartment 4 with GPRS antenna 5, and GPRS antenna 5 is by the transmission of long distance wireless transmission 7 realizations with host computer 6.
Can arrange frequency acquisition according to user's request, setting interval is 15～25min, by the operation of upper computer software control gprs system, namely data data acquisition and controlling circuit board is activated, the beginning Monitoring Data Real-time Collection, the electric signal of collection is converted to numerical signal by A/D, by the GPRS teletransmission to client-server and control software, the data communication device that real-time Transmission is returned is crossed and the background value contrast, when calculating gained change in resistance rate ε
iDuring ∈ E, system identifies pollution automatically, and manifests in real time rear each the monitoring site resistivity curve of pollution and pollute peak strip by the data processing module of host computer, and this data processing module can be realized and the embedding host computer by the matlab programming.
Embodiment
Shown in Fig. 4-6, certain large petrochemical plant periphery detects in the Comprehensive Evaluation of Groundwater Quality process has diesel oil to occur, and supposition may exist diesel oil to leak, and causes this district's low ground water to be polluted.According to the groundwater monitoring data; choose this area's groundwater protection target and excavate vertical shaft as main monitoring point; position, main monitoring point along position, 200m position, water (flow) direction both sides in the upper and lower 400m scope of water (flow) direction as the auxiliary monitoring point; 5 cover monitoring devices are set altogether; the Parallel to the flow direction numbering is respectively A, B, C; be numbered D, E perpendicular to water (flow) direction, the B monitoring site.This area's bury of groundwater is more shallow, and the groundwater level fluctuation scope is-3.5m～-5.5m, the Quaternary system sediment is sand silt, opaque mild clay, the resistivity feeler lever is selected taper bit.
Choose on-the-spot soil sample and water sample and carry out the contaminated by diesel oil simulation test, with the critical value 500mg/kg of " standard of soil environment quality " (GB 15618-1995) Hydrocarbon in Soil content as polluting normative reference, obtaining polluting the rear soil body and water body resistivity range of variation is 0.29-10.87, is set to the on-the-spot identification lower limit that pollutes with 0.29.
On-the-spot is 6 meters with resistivity feeler lever length, electrode separation 5cm, and 120 of electrode number of rings arrange data acquisition time and are spaced apart 20min, and sampling depth is 0.5m～6m, and required measurement point position is 111, and it is 114 that the working electrode number then is set.
The opening device client software, Real-time Collection, the wireless transmission of realization data, and data are preserved and are processed.If in pollution range E, then system identifies pollution to monitoring numerical value automatically through the software automatic data processing, can judge Contaminants Transport forward reached position and pollute peak strip this moment by showing in real time resistivity curve.Accompanying drawing 4 is five feeler lever monitoring site resistivity background values, accompanying drawing 5 ~ 6 for system identification pollute after certain constantly A, B, C, D, five feeler levers monitoring gained resistivity of E and diesel oil migration peak strip location drawing, as seen from the figure, the diesel oil migration pollutes five monitoring locations, " protruding " shape peak strip among the figure is the diesel oil layer, A, C, D and E peak strip diesel oil deep scope are respectively 3.65 ~ 4.2m, 4.4 ~ 4.9m, 4.2 ~ 4.5m and 4.25 ~ 4.5m, the B monitoring site can find out that by the variation that resistivity raises diesel oil has passed through monitor well in monitor well.By above analysis as seen, contaminated by diesel oil spreads in the horizontal direction and has at least reached 400(perpendicular to water (flow) direction) * 800(is along water (flow) direction) the m scope, vertical upper diffusion has reached 3.65 ~ 4.9m degree of depth.
Claims (6)
1. the real-time automatic monitoring method of underground light nonaqueous phase liquid Pollutants Diffusion comprises:
1) monitors to determine to monitor the suspicious pollution source zone in area and the monitoring site of suspicious pollution source according to simulation and forecast or conventional underground water water sample; And obtain and monitor regional feature LNAPLs pollutant;
It is characterized in that may further comprise the steps:
2) choose on-the-spot underground water and the pedotheque of each monitoring site, carry out resistivity and survey pollution migration analog monitoring, checking is to the applicability of this monitoring site, if the soil moisture content of this monitoring site has adaptability greater than 5%, and obtain the resistivity range of variation E of feature LNAPLs pollution after each has adaptive monitoring site generation
i, i ∈ M, M are the quantity with adaptive monitoring site.
3) according to the change in depth scope of the underground water of monitoring site, choose the feeler lever length of specific resistance monitoring device; Choose the spacing of resistivity feeler lever upper electrode rings according to required detection accuracy;
4) water (flow) direction under the base area, the monitoring site injection one cover specific resistance monitoring device that in suspicious pollution source area, has underground water to be monitored, as the first monitoring site, distinguishing at least injection one cover specific resistance monitoring device apart from the monitoring site that is positioned at the underground water upstream and downstream in this cover monitoring device 400～600m scope; And the GPRS antenna of specific resistance monitoring device is elevated above the soil;
Distinguish at least injection one cover specific resistance monitoring device in groundwater flow direction both sides and apart from the position of the first monitoring site 200～300m;
5) acquisition parameter is set, comprises the specific resistance monitoring device that select to open is used for monitoring, and the electrode retaining collar number that gathers of frequency acquisition and being used for; Resistivity situation to the scene is carried out Real-time Collection, and with the resistivity upload server that collects;
6) after sniffer is buried underground, with record regional uncontaminated the time data be worth as a setting, the data communication device that real-time Transmission is returned is crossed and background value contrast, if resistivity reaches certain monitoring site E
jLower limit, namely work as the change in resistance rate ε that receives
j∈ E
jThe time, then automatically be identified as and LNAPLs occur and pollute, report to the police simultaneously, and alarming short message is sent to given client, wherein, j ∈ N, N are the quantity of specific resistance monitoring device, ε
jRepresent the change in resistance value that j specific resistance monitoring device records.
7) after the LNAPLs pollution appears in system identification, draw resistivity curve and the preservation of each monitoring point;
8) analyze the resistivity curve that pollutes rear certain moment, obtain LNAPLs migration forward reached position, and the LNAPLs pollution depth scope of monitoring site, be referred to as peak strip, comprehensive each monitoring site migration forward position, thus real-time three-dimensional space-pollution scope obtained.
2. monitoring method as claimed in claim 1, it is as follows to it is characterized in that above-mentioned feature LNAPLs pollutes the definite method of the resistivity range of variation E after certain monitoring site occurs:
Get the on-the-spot uncontaminated soil sample of monitoring site and sampling of ground water, utilize acquired feature LNAPLs pollutant, change in resistance rate score scope when determining that monitoring site is subject to this feature LNAPLs and pollutes, when pollutant levels surpass the minimum limit value of national Specification, be defined as soil and polluted, when the soil pollution thing reaches capacity state, be the pollution upper limit.
3. monitoring method as claimed in claim 1 is characterized in that above-mentioned steps 4) in adopt the auger drill head revolution to pierce for cohesive soil, adopt the taper bit hammering to pierce for silt and sand.
4. monitoring method as claimed in claim 1 is characterized in that above-mentioned steps 4) be to replace with following method:
At first, excavate a vertical shaft directly over the underground water in the monitored area, this vertical shaft communicated with underground water, with this vertical shaft as the groundwater monitoring well; Then in this monitor well, hang a cover specific resistance monitoring device; Distinguishing at least injection one cover specific resistance monitoring device apart from the monitoring site that is positioned at the underground water upstream and downstream in this monitor well 400～600m scope; And the GPRS antenna of specific resistance monitoring device is elevated above the soil; Feeler lever length in the well should guarantee that it probes into below the water surface at least 20cm; And distinguish at least injection one cover specific resistance monitoring device in groundwater flow direction both sides and apart from the position of this monitor well 200～300m.
5. the real-time automatic monitoring system of underground light nonaqueous phase liquid Pollutants Diffusion, comprise the resistivity detection system that realizes detection, data acquisition and wireless communication functions, and realize sending instruction, data receiver, show in real time the host computer (6) with auto-alarm function
It is characterized in that described resistivity detection system comprises at least five specific resistance monitoring devices, described specific resistance monitoring device comprises resistivity feeler lever (2) and is arranged on the equipment compartment (4) at resistivity feeler lever (2) top, be provided with GPRS wireless transport module and Data Control module in this equipment compartment (4), and extending equipment GPRS antenna (5) out of my cabin; Described resistivity feeler lever (2) is the cylindrical structural body that outside surface is provided with at least 4 electrode retaining collars (3) equally spacedly, and described electrode retaining collar (3) is connected with the Data Control module via the wire that is positioned at cylindrical structural body inside;
Described host computer (6) comprises the server that includes the client control program, and the warning device that is connected with server; Described client control program is used for arranging parameter, transmission data acquisition instruction, remote synchronization transmission of monitoring data, the automatic identification of resistivity detection system and pollutes, shows the rear in real time resistivity curve of pollution, and sends alerting signal to warning device; Described client control program is by the communication of ICP/IP protocol realization with the resistivity detection system.
6. monitoring system as claimed in claim 5, it is characterized in that above-mentioned resistivity feeler lever (2) is the peg graft cylindrical structural body of the hollow that forms of the tubulose nylon module of hollow, and copper electrode retaining collar (3) clip is arranged between adjacent two modules, have wire that described copper electrode retaining collar (3) is connected with the Data Control module in cylindrical structural body inside, and filling have epoxy resin adhesive in the cylindrical structural body of hollow.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103604840A (en) * | 2013-10-21 | 2014-02-26 | 浙江大学 | Device for measuring water content of soil and concentration of ion pollutants in centrifuge |
| CN103808635A (en) * | 2014-01-20 | 2014-05-21 | 浙江大学 | Device and method for measuring water diffusion rate in porous medium |
| CN103852425A (en) * | 2014-03-21 | 2014-06-11 | 南京大学 | Method for quantitatively monitoring DNAPL (Dense Nonaqueous Phase Liquid) migration process and saturation degree |
| CN103913429A (en) * | 2014-03-21 | 2014-07-09 | 南京大学 | Method for quantifying fluid saturation of two-phase flow in pore medium by light transmission method |
| WO2015085696A1 (en) * | 2013-12-10 | 2015-06-18 | 唐山学院 | Control method and apparatus for sulfuric acid leakage monitoring |
| CN105158301A (en) * | 2015-10-16 | 2015-12-16 | 上海岩土工程勘察设计研究院有限公司 | Polluted soil detection method based on cross-hole resistivity CT method |
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| CN111242384A (en) * | 2020-01-19 | 2020-06-05 | 四川省地质工程勘察院集团有限公司 | Pollution identification and analysis method for underground water environment |
| CN111398360A (en) * | 2020-04-21 | 2020-07-10 | 山东大学 | Pollution source region detection method and system based on L NAP L s in ERT and IP delineation envelope gas zone |
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| CN114706130A (en) * | 2022-02-28 | 2022-07-05 | 中国海洋大学 | Method for in-situ measurement of vertical distribution range of seabed bubble type shallow gas |
| CN115081963A (en) * | 2022-08-19 | 2022-09-20 | 江西省生态环境科学研究与规划院 | Underground water quality risk analysis method and system |
| CN115684527A (en) * | 2022-10-27 | 2023-02-03 | 山东冽泉环保工程咨询有限公司 | Method for monitoring non-aqueous phase liquid |
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| CN103604840A (en) * | 2013-10-21 | 2014-02-26 | 浙江大学 | Device for measuring water content of soil and concentration of ion pollutants in centrifuge |
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