CN110007351A - A kind of induced polarization method detecting heavy metal containing sewage - Google Patents
A kind of induced polarization method detecting heavy metal containing sewage Download PDFInfo
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- 230000010287 polarization Effects 0.000 title claims abstract description 91
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000010865 sewage Substances 0.000 title claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 62
- 238000005259 measurement Methods 0.000 claims abstract description 41
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 5
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- 239000003344 environmental pollutant Substances 0.000 description 12
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- 238000011160 research Methods 0.000 description 10
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
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- 239000003802 soil pollutant Substances 0.000 description 2
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- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 241000372132 Hydrometridae Species 0.000 description 1
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- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
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Abstract
The invention belongs to Environmental Geophysics exploration engineering fields, disclose a kind of induced polarization method for detecting heavy metal containing sewage, the current emission cathode of current emission anode and depth of exploration is set in distance measurement point lateral distance somewhere, heavy metal-polluted pond, polarizability receiving point is determined in the induced polarization device other side of detection heavy metal containing sewage, and do not polarize anode and the cathode that do not polarize are symmetrical arranged at left and right sides of polarizability receiving point；Current emission source, weighing apparatus stream controller, induced polarization instrument are connected to power supply, selective exitation polarization measurement mode carries out sensing point detection；Point-to-point measurement polarizability in moving process；Plan cross-sectional measurement is carried out again, until completing all sensing point measurements on survey line.This measurement method structure is simple, easy to operate, and rationally, detection result is reliable and stable, can be widely applied to the induced polarization investigation and prospecting in the heavy metal-polluted water harnessing field such as industry, mine engineering for design.
Description
Technical field
The invention belongs to Environmental Geophysics exploration engineering field more particularly to a kind of excitation poles for detecting heavy metal containing sewage
Change method.
Background technique
Currently, the immediate prior art:
With the rapid development of economy, the exacerbation in mining area, industrial sites heavy metal element contaminated wastewater, problem of environmental pollution
It gets worse, mining area, the research of industrial sites environmental pollution monitoring and its comprehensive treatment are in Practical Project and environmental geotechnical
In be concerned.Research statistics show in hundreds of polluted enterprises land used and Soil Surrounding disposal field, heavy metal-polluted
Dye situation is extremely severe, and pollution range is gradually spread from disposal field to Soil Surrounding, from shallow-layer to deep layer depth, is even resulted in
Underground water pollution seriously affects the sustainable development of China's economy and society.The development of heavy metal wastewater thereby monitoring technology, evaluation system
Building is basic premise and the basis of pollution control, and how to be developed in the case where considering monitoring cost, efficiency and precision factor background
Novel heavy metal waste water leakage monitoring technological means is the task when the great challenge of previous item.
Traditional pollutant effluents monitoring mostly uses the methods of chemical agent trace method, sampling analysis method and probing monitoring technology,
" What You See Is What You Get " monitoring effect can be achieved, theory and application research is more mature.
However, trace method is only capable of qualitative instruction leakage orientation, pollution source is then brought in improper use into；Sampling analysis can not
Provide waste water leakage path；Drill hole sampling infers that leakage is distributed, hole location injection then destroys pollution distribution and rich with " a peephole view "
Collect structure, long period monitoring unworthiness etc..Based on pollutant effluents and difference of its surrounding medium in physical property, earth object
Monitoring technology is managed by physical field feature within the scope of analysis and Study of The Underground certain depth, is widely used in and heuristically descends pollutant effluents
The space transitivity of leakage is distributed.If magnetic method is applied to the feasibility study of landfill yard leak detection, its scope of application is specified.
The refuse landfill leakage pollution liquid after closing is detected using transient electromagnetic method, divided garbage loading embeading depth and
Range, and drawn a circle to approve pollution boundary.The petroleum hydrocarbon contaminated feasibility of geologic radar detection underground water is analyzed, and Effect on Detecting is discussed
Influence factor；Geological radar is applied to typical urban contaminated site investigation and assessment, provides for the reparation etc. in contaminated site later period
Preferable reference value.
But heavy metal polluted waste water magnetic anomaly and electromagnetic induction effect intensity are faint, vulnerable to environmental disturbances；When Ground Penetrating Radar
Between section be only used for qualitative interpretation, specific inferred from attributes can not be provided.
Based on heavy metal polluted waste water and its surrounding rocks resistivity contrasts, resistivity method is widely used in an industrial sites huge sum of money
Belong to pollutant effluents leakage prison (inspection) to survey.Resistivity piezocone penetration test method is applied to environmental pollution water and place soil assessment point
Analysis.The application study in-progress summary of Polluted Soil electrical resistivity property and resistivity method detection, it is indicated that resistivity method is to contaminated site dirt
Dye object characteristic is monitored the development trend of evaluation.Carry out the AC resistance rate characteristic of unsaturation Cu solution pollution sand, it is clear
Its resistivity is with power frequency, content of copper ion, moisture change rule.Oily wastewater contaminated area in different soils is carried out
Electrical Changeement and contaminated area survey；By analyzing Pb solution contaminated soil, Zn solution contaminated soil in failure by shear
During change in resistance situation, define raw resistivity and the susceptibility of the soil body to reflect that the resistivity of Polluted Soil is special
Property, pollution level is higher, and raw resistivity value is smaller, and susceptibility is lower.Carried out pollution of chromium soil resistivity experiment comparison with
Analysis, research is using the variation characterization pollution level variation of the pollution of chromium soil change in resistance slope of curve.
Generally, resistivity method is for there is solid theoretical basis and wide in terms of heavy metal wastewater thereby and soil pollution monitoring
General application practice, but resistivity amplitude height variation is only used for qualitative instruction pollution level presence or absence.Although testing heavy metal
Pollutant effluents change in resistance rule obtains greater advance, but complicated factor existing for actual place is responsible for above-mentioned resistance
Rate variation, especially in terms of distinguishing underground water or saturated water soil and pollution sources, resistivity method is usually helpless.
Effect of induced polarization is considered as that surrounding rocks cause with the electric double layer on surrounding liquid interface, is sharp all the time
The basic principle of electric water detection has mature application in pore water, crevice water and karst water Exploration Domain.For having with underground water
For having the pollutant effluents of same alike result, induced polarization method is constantly applied to industrial sites pollution monitoring field.In early days, for water
The electric conductivity of pollution and sharp electrical property are studied with pollution concentration variation relation, and are shown experimentally that different pollutant component samples
The resistivity and polarizability of product reduce with the increase of Pore Solution concentration, monitor underground water pollution using traditional induced polarization method
It is relatively difficult.Later period, carried out different water cut (in the case where various concentration chromic salts pollutant, chromium-polluted soil sample
Resistivity, complex resistivity and the complex dielectric permittivity and pollutant concentration of product and some experimental observation knots of water-cut variation relationship
Fruit has carried out the major influence factors exploratory development of contaminated soil electrical parameter.Soil pollution to variety classes different content
The sample of object measures experiment, and the spectrum induced polarization phase property of its soil pollutant of induction and conclusion is applied to for spectrum induced polarization
Solid foundation has been established in soil pollutant investigation.The sharp electrical resistivity survey test of time-frequency domain is carried out by simulating place in outdoor pollution of chromium, is ground
Study carefully result point out simple time domain parameter (apparent resistivity and apparent chargeability) be difficult distinguish moisture content and chromium concn difference caused by it is low
Resistance is abnormal, and uses frequency domain parameter phase angle or can distinguish low-resistance exception caused by moisture content and chromium concn difference.
As it can be seen that traditional induced polarization method has preferable advantage and application in terms of the monitoring of pollutant effluents and contaminated soil
Basis excites electric field system based on long conducting wire, a variety of not true in target stains body scale, orientation and sharp electrical effect intensity etc.
Under the influence of determining combined factors, induced polarization anomaly intensity is very faint；In addition monitoring environment generally existing, the monitoring accuracy that often interferes with source
It is in urgent need to be improved.
The common induced polarization device of induced polarization method is symmetrical four-stage device, and this induced polarization device can be used for indirectly
Incentives target body swashs electrical effect, and the pitch requirements for positive and negative anodes of powering are larger, too long positive and negative anodes away from it is big with field wiring difficulty,
The disadvantages such as working efficiency is low, interference signal is complicated, detection accuracy is low.Current heavy metal containing sewage Exploration Domain yet there are no to be directed to and connect
Touch is directly powered the research report of induced polarization device, therefore there is an urgent need to develop a kind of innovative contacts directly for electric shock
Polarization device is sent out, to mining area, industrial sites heavy metal element contaminated wastewater distribution detection and research work.
In conclusion problem of the existing technology is:
(1) trace method is only capable of qualitative instruction leakage orientation, pollution source is then brought in improper use into；Sampling analysis can not be given
Waste water leakage path out；Drill hole sampling infers that leakage distribution, hole location injection then destroy pollution distribution and enrichment with " a peephole view "
Structure, long period monitoring unworthiness etc..
(2) heavy metal polluted waste water magnetic anomaly and electromagnetic induction effect intensity are faint, vulnerable to environmental disturbances；When Ground Penetrating Radar
Between section be only used for qualitative interpretation, specific inferred from attributes can not be provided, it is difficult to solve the problems, such as monitoring heavy metal pollution.
(3) there is solid theoretical basis in terms of prior art resistivity method is for heavy metal wastewater thereby and soil pollution monitoring
And practice is widely applied, but resistivity amplitude height variation is only used for qualitative instruction pollution level presence or absence.Although experiment weight
Metallic pollution waste water resistivity changing rule obtains greater advance, but complicated factor existing for actual place be responsible for it is above-mentioned
Change in resistance, especially in terms of distinguishing underground water or saturated water soil and pollution sources, resistivity method is usually helpless.
(4) in the prior art, induced polarization device swashs electrical effect, the spacing for positive and negative anodes of powering for indirect excitation objective body
It is required that larger, too long positive and negative anodes are away from field wiring difficulty is big, working efficiency is low, interference signal is complicated, detection accuracy is low
The disadvantages of.
Solve the difficulty of above-mentioned technical problem:
(1) the monitoring environment of pollutant effluents and contaminated soil is intricate, and interference signal intensity is larger；When target stains body
Under a variety of uncertain factor combined influences such as scale, orientation and sharp electrical effect intensity, induced polarization anomaly intensity be very it is faint, lead
It causes to infer that Explanation Accuracy is extremely limited.
(2) common induced polarization observation system is symmetrical four-stage device conventional surface observational system, most of to monitor place reality
Border situation is unable to satisfy above-mentioned observation system and lays requirement, causes very to be originally just that faint induced polarization anomaly signal is more difficult to area
Point, it is not able to satisfy exploration demand.
Solve the meaning of above-mentioned technical problem:
Heavy metal containing sewage Exploration Domain yet there are no the research report for induced polarization method of directly powering for contact, because
This directly powers induced polarization device there is an urgent need to develop a kind of innovative contact, to mining area, industrial sites heavy metal
Element contaminated wastewater distribution detection and research work.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of induced polarization methods for detecting heavy metal containing sewage.
The existing detection positive and negative anodes of existing indirect induced polarization exploration are solved away from excessive, field wiring difficulty is big, working efficiency is low, dry
Disturb the problems such as signal is complicated, detection accuracy is low, at high cost, low efficiency.
The invention is realized in this way a kind of induced polarization method for detecting heavy metal containing sewage, the detection is heavy metal-polluted
The induced polarization method of water measures polarizability using contact power supply, plane survey line Gradient methods, specifically includes:
The first step, the induced polarization device by detecting heavy metal containing sewage determine sensing point starting position and investigative range,
The current emission that current emission anode and depth of exploration are arranged in distance measurement point lateral distance somewhere, heavy metal-polluted pond is negative
Pole determines polarizability receiving point in the induced polarization device other side of detection heavy metal containing sewage, in polarizability receiving point or so two
Side is symmetrical arranged do not polarize anode and the cathode that do not polarize；
Second step connects to power supply current emission source, weighing apparatus stream controller, induced polarization instrument, selective exitation polarization measurement mode,
Carry out sensing point detection；
Third step, point-to-point measurement polarizability in moving process；Plan cross-sectional measurement is carried out again, until completing own on survey line
Sensing point measurement.
Further, in the first step, measuring point starting position L1 and investigative range are L2, in distance measurement point lateral distance L1
Round cascaded structure current emission anode is set in place, heavy metal-polluted pond and meets the lateral distance of 3~5 times of depth of exploration h
The current emission cathode at place, lateral distance L1+L2+L3；
Polarizability reception does not polarize anode and the distance between cathode point and current emission cathode are L3, do not polarize it is positive with
The distance between the cathode that do not polarize is L4, and L1 minimum value is R, and L3 minimum value is 1.5h, the L1 that L4 value is 0.05~0.15 times
Value.
Further, in second step, in selective exitation polarization measurement mode, electric current be greater than 50mA, and average value deviation≤
2%；Ground resistance maximum value≤20 Ω .m；
The method of sensing point detection includes: on the basis of detection direction L4, and current emission anode and current emission cathode are solid
Fixed motionless, the positive and cathode that do not polarize that do not polarize is by L4 distance mutually gradually to observed direction movement.
Further, in third step, the method for carrying out plan cross-sectional measurement includes: to choose induced-polarization measurement mode, input
Related device parameter, power-on time are set as 8s, and a half period is selected in measurement, until completing sensing point all on survey line.
Another object of the present invention is to provide a kind of spies of induced polarization method for implementing the detection heavy metal containing sewage
The induced polarization device of heavy metal containing sewage is surveyed, the induced polarization device of the detection heavy metal containing sewage is provided with contact connection electricity
Flow emission source；
Contact current emission is equipped with induced polarization instrument on source；
It is respectively connected with positive wire on the positive and negative anodes in contact current emission source, with the cathode on contact current emission source
Connected cathode conductor end is connected with current emission cathode；
Several current emission anodes are evenly distributed on containing in heavy metal-polluted pond, and all current emission anodes are in parallel and lead to
Conducting wire is crossed to be connected with the anode on current emission source；
Measurement positive and negative anodes on induced polarization instrument pass through conducting wire respectively and are connected with do not polarize anode and cathode；
Each current emission positive lead road is in series with constant-current controller.
It further, is R by the round suspension structure radius that all current emission anodes form, minimum R is cesspool plane
The 1/5 of oblique line meets current emission area coverage demand.
Further, the number of the current emission anode meets t=int (π R/2m), meets current emission strength demand.
Further, the current emission cathode is placed in outside 3~5 times of depth of exploration ranges, is met and is emitted need as point source
It asks.
Another object of the present invention is to provide a kind of mines of induced polarization device for carrying the detection heavy metal containing sewage
Area's heavy metal element contaminated wastewater detects terminal.
Another object of the present invention is to provide a kind of works of induced polarization device for carrying the detection heavy metal containing sewage
Industry place heavy metal element contaminated wastewater detection device.
In conclusion advantages of the present invention and good effect are as follows:
The invention discloses a kind of induced polarization method of the detection containing heavy metal-containing polluted water and contaminated soil, the detection methods
Polarizability is measured using contact power supply, plane survey line Gradient methods, contact power supply unit includes contact connection electric current hair
Source is penetrated, contact current emission is equipped with induced polarization instrument on source.It is respectively connected with conducting wire on the positive and negative anodes in contact current emission source, with
The wire end that cathode on contact current emission source is connected is connected with current emission cathode, is placed in 3~5 times of depth of exploration models
Except enclosing；It further include current emission anode assembly, which includes several current emission anodes, current emission
Anode is evenly distributed on containing within heavy metal-polluted pond, the power supply of contact electric current is carried out in cesspool, all current emissions are just
Pole is in parallel and is connected by conducting wire with the anode on current emission source.Measurement positive and negative anodes on induced polarization instrument are connected by conducting wire respectively
It is connected to do not polarize anode and cathode；Choose induced-polarization measurement mode, input related device parameter and power-on time, point by point until
It completes sensing point all on survey line and measures polarizability.The configuration of the present invention is simple, easy to operate, rationally, detection result is steady for design
It is fixed reliable, it can be widely applied to the induced polarization investigation and prospecting in the heavy metal-polluted water harnessing field such as industry, mine engineering.
Compared with prior art, the induced polarization method of detection heavy metal containing sewage provided by the invention includes that pure current field connects
Mode of excitation is designed as contact and directly powered by touch power supply unit, the device, generated within the scope of measuring point it is stable, can obtain
The higher-strength excitation current field for taking the larger heavy metal containing sewage of contaminated site range can effectively excite contaminant water and contaminated soil
Induction field, can be in effective polarization exception of ground observation to pollution sources.This measurement method structure is simple, easy to operate, design
Rationally, detection result is reliable and stable, can be widely applied to the induced polarization in the heavy metal-polluted water harnessing field such as industry, mine engineering
Investigation and prospecting.
Detailed description of the invention
Fig. 1 is the induced polarization method flow diagram of detection heavy metal containing sewage provided in an embodiment of the present invention.
Fig. 2 is the induced polarization apparatus structure schematic diagram of detection heavy metal containing sewage provided in an embodiment of the present invention.In figure: 1,
Current emission source；2, induced polarization instrument；3, positive wire；4, cathode conductor；5, current emission cathode；6, current emission anode；7, again
Metal cesspool；8, do not polarize anode and cathode；9, constant-current controller；10, suspension structure.
Fig. 3 is the model structure provided in an embodiment of the present invention detected.
Fig. 4 is the induced polarization device usage state diagram of detection heavy metal containing sewage provided in an embodiment of the present invention.
Fig. 5 is contact induced polarization method Experiment Result figure provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Heavy metal polluted waste water magnetic anomaly and electromagnetic induction effect intensity are faint, vulnerable to environmental disturbances；The Ground Penetrating Radar time
Section is only used for qualitative interpretation, can not provide specific inferred from attributes.
Prior art resistivity method for have in terms of heavy metal wastewater thereby and soil pollution monitoring solid theoretical basis and
Practice is widely applied, but resistivity amplitude height variation is only used for qualitative instruction pollution level presence or absence.Although an experiment huge sum of money
Belong to pollutant effluents change in resistance rule and obtain greater advance, but complicated factor existing for actual place is responsible for above-mentioned electricity
The variation of resistance rate, especially in terms of distinguishing underground water or saturated water soil and pollution sources, resistivity method is usually helpless.It is existing
In technology tradition induced polarization method, monitoring accuracy is low.In the prior art, induced polarization device swashs electricity for indirect excitation objective body
The pitch requirements of effect, positive and negative anodes of powering are larger, and too long positive and negative anodes are away from field wiring difficulty is big, working efficiency is low, dry
Disturb the disadvantages such as signal is complicated, detection accuracy is low.Heavy metal containing sewage Exploration Domain yet there are no for contact directly for being electrically excited
The research of polarization device reports, therefore directly powers induced polarization device there is an urgent need to develop a kind of innovative contact, to
To mining area, industrial sites heavy metal element contaminated wastewater distribution detection and research work
To solve the above problems, below with reference to concrete scheme, the present invention is described in detail.
As shown in Figure 1, the induced polarization method of detection heavy metal containing sewage provided in an embodiment of the present invention is supplied using contact
Electric installation, plane survey line Gradient methods measure polarizability, specifically include:
S101, the induced polarization device by detecting heavy metal containing sewage determine sensing point starting position L1 and investigative range
Round cascaded structure current emission anode is arranged at distance measurement point lateral distance L1, in heavy metal-polluted pond and meets 3 by L2
Current emission cathode at~5 times of depth of exploration h lateral distances (L1+L2+L3), in the induced polarization dress of detection heavy metal containing sewage
It sets the other side and determines that polarizability receives do not polarize anode and cathode, polarizability receives do not polarize anode and cathode point and current emission
The distance between cathode is L3, the positive M and cathode N that do not polarize that do not polarize is symmetrical arranged at left and right sides of polarizability receiving point, no
Polarization anode and do not polarize the distance between cathode be L4, L1 minimum value be R, L3 minimum value be 1.5h, L4 value be 0.05~
0.15 times of L1 value.
S102 connects to power supply current emission source, weighing apparatus stream controller, induced polarization instrument, opens instrument power source and enters system inspection
It looks into, selective exitation polarization measurement mode, checks each circuit supply current of suspension contact power supply unit, it is desirable that all electric currents are big
In deviation≤2% of 50mA, and average value；Ground resistance maximum value≤20 Ω .m；It is detection point design in next step: with the side of detection
To on the basis of L4, current emission anode and current emission cathode are fixed, do not polarize positive M and do not polarize cathode N by L4 away from
It is gradually mobile to observed direction from mutually.
S103, point-to-point measurement polarizability in moving process；Plan cross-sectional measurement is carried out again: choosing induced-polarization measurement mould
Formula inputs related device parameter, and power-on time is set as 8S, and a half period is selected in measurement, all on survey line until completing
Sensing point.
As shown in Fig. 2, the induced polarization device of detection heavy metal containing sewage provided in an embodiment of the present invention includes that contact connects
Current emission source 1 is connect, contact current emission is equipped with induced polarization instrument 2 on source.
It is respectively connected with conducting wire 3 on the positive and negative anodes in contact current emission source, with the cathode phase on contact current emission source
4 end of conducting wire even is connected with current emission cathode 5, is placed in except 3~5 times of depth of exploration ranges；Further include current emission just
Pole assembly, which includes several current emission anodes 6, and current emission anode is evenly distributed on containing heavy metal
Within cesspool 7, the power supply of contact electric current is carried out in cesspool, all current emission anodes are in parallel and by conducting wire and electricity
The anode flowed on emission source is connected.
Measurement positive and negative anodes on induced polarization instrument pass through conducting wire respectively and are connected with do not polarize anode and cathode 8；Choose induced polarization
Measurement pattern inputs related device parameter and power-on time, measures polarizability until completing sensing point all on survey line point by point.
Each current emission positive lead road is in series with constant-current controller 9.
It is R by 10 radius of round suspension structure that all current emission anodes form, minimum R is cesspool plane oblique line
1/5。
The number of the current emission anode meets t=int (π R/2m).
The invention will be further described combined with specific embodiments below.
Embodiment:
It is powered using contact of the invention, the induced polarization method of plane survey line gradiometry mode is to as shown in Figure 3
When being detected containing heavy metal-containing polluted water and soil (pre-buried) soil box model, design a round suspension contact detection huge sum of money first
Belong to the induced polarization device of sewage；Sensing point starting position L1 and investigative range L2 are determined, in distance measurement point lateral distance L1
Round cascaded structure current emission anode 6 is set in place, heavy metal-polluted pond 7 and meets 3~5 times of depth of exploration h lateral distances
(L1+L2+L3) the current emission cathode 5 at determines that polarizability connects in the induced polarization device other side of detection heavy metal containing sewage
Electrode 8 is received, the distance between polarizability receiving point 8 and current emission cathode are L3, symmetrical at left and right sides of polarizability receiving point
The positive M and cathode N that do not polarize that do not polarize is set, and do not polarize anode and the distance between the cathode that do not polarize are L4, and L1 minimum value is
R, L3 minimum value are 1.5h, L4=2cm；Followed by device Job readiness: by current emission source 1, weighing apparatus stream controller 9, induced polarization instrument 2
It connects to power supply, opens instrument power source and enter systems inspection, selective exitation polarization measurement mode checks suspension contact for Denso
Set each circuit supply current, it is desirable that all electric currents are greater than 50mA, and deviation≤2% of average value；Ground resistance maximum value≤
20Ω.m；Be detection point design in next step: on the basis of detection direction L4, current emission anode 3 and current emission cathode 5 are fixed
Motionless, the positive M and cathode N that do not polarize that do not polarize is by L4 distance mutually gradually to observed direction movement.
As shown in figure 4, point-to-point measurement polarizability in moving process；It is finally plan cross-sectional measurement: chooses induced polarization and survey
Amount mode inputs related device parameter, and power-on time is set as 8S, and a half period is selected in measurement, until completing institute on survey line
Some sensing points, detection result are as shown in Figure 5.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of induced polarization method for detecting heavy metal containing sewage, which is characterized in that the excitation pole of the detection heavy metal containing sewage
Change method measures polarizability using contact power supply, plane survey line Gradient methods, specifically includes:
The first step, by detect heavy metal containing sewage induced polarization device determine sensing point starting position and investigative range, away from
Current emission cathode from setting current emission anode and depth of exploration in sensing point lateral distance somewhere, heavy metal-polluted pond,
Polarizability receiving point is determined in the induced polarization device other side of detection heavy metal containing sewage, it is right at left and right sides of polarizability receiving point
Claim to be arranged do not polarize anode and the cathode that do not polarize；
Second step connects to power supply current emission source, weighing apparatus stream controller, induced polarization instrument, and selective exitation polarization measurement mode carries out
Sensing point detection；
Third step, point-to-point measurement polarizability in moving process；Plan cross-sectional measurement is carried out again, until completing all detections on survey line
Point measurement.
2. the induced polarization method of detection heavy metal containing sewage as described in claim 1, which is characterized in that in the first step, measuring point
Starting position L1 and investigative range are L2, and round series connection is arranged at distance measurement point lateral distance L1, in heavy metal-polluted pond
Structure current emission anode and meet the current emission cathode at the lateral distance of 3~5 times of depth of exploration h, lateral distance L1+
L2+L3；
Polarizability reception does not polarize positive and the distance between cathode point and current emission cathode as L3, do not polarize anode and not pole
Changing the distance between cathode is L4, and L1 minimum value is R, and L3 minimum value is 1.5h, the L1 value that L4 value is 0.05~0.15 times.
3. the induced polarization method of detection heavy metal containing sewage as described in claim 1, which is characterized in that in second step, selection
In induced-polarization measurement mode, electric current is greater than 50mA, and deviation≤2% of average value；Ground resistance maximum value≤20 Ω .m；
The method of sensing point detection includes: on the basis of detection direction L4, and current emission anode and current emission cathode are fixed not
Dynamic, the positive and cathode that do not polarize that do not polarize is by L4 distance mutually gradually to observed direction movement.
4. the induced polarization method of detection heavy metal containing sewage as described in claim 1, which is characterized in that in third step, carry out
The method of plan cross-sectional measurement includes: to choose induced-polarization measurement mode, inputs related device parameter, and power-on time is set as
A half period is selected in 8s, measurement, until completing sensing point all on survey line.
5. a kind of excitation for the detection heavy metal containing sewage for implementing the induced polarization method of detection heavy metal containing sewage described in claim 1
Polarization device, which is characterized in that the induced polarization device of the detection heavy metal containing sewage is provided with contact connection current emission
Source；
Contact current emission is equipped with induced polarization instrument on source；
It is respectively connected with positive wire on the positive and negative anodes in contact current emission source, is connected with the cathode on contact current emission source
Cathode conductor end be connected with current emission cathode；
Several current emission anodes are evenly distributed on containing in heavy metal-polluted pond, and all current emission anodes are in parallel and by leading
Line is connected with the anode on current emission source；
Measurement positive and negative anodes on induced polarization instrument pass through conducting wire respectively and are connected with do not polarize anode and cathode；
Each current emission positive lead road is in series with constant-current controller.
6. the induced polarization device of detection heavy metal containing sewage as claimed in claim 5, which is characterized in that
It is R by the round suspension structure radius that all current emission anodes form, minimum R is the 1/5 of cesspool plane oblique line.
7. the induced polarization device of detection heavy metal containing sewage as claimed in claim 5, which is characterized in that the current emission is just
The number of pole meets t=int (π R/2m).
8. the induced polarization device of detection heavy metal containing sewage as claimed in claim 5, which is characterized in that the current emission is negative
Pole is placed in outside 3~5 times of depth of exploration ranges.
9. a kind of heavy metals mining area element waste water for carrying the induced polarization device of detection heavy metal containing sewage described in claim 5 is dirty
Dye detection terminal.
10. a kind of industrial sites heavy metal element for carrying the induced polarization device of detection heavy metal containing sewage described in claim 5
Contaminated wastewater detection device.
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