CN202865066U - Chemical oxygen demand (COD) on-line measuring device applied to sewage treatment - Google Patents
Chemical oxygen demand (COD) on-line measuring device applied to sewage treatment Download PDFInfo
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- CN202865066U CN202865066U CN 201220536932 CN201220536932U CN202865066U CN 202865066 U CN202865066 U CN 202865066U CN 201220536932 CN201220536932 CN 201220536932 CN 201220536932 U CN201220536932 U CN 201220536932U CN 202865066 U CN202865066 U CN 202865066U
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Abstract
The utility model relates to sewage treatment, and in particular to a COD on-line measuring device applied to sewage treatment. The COD on-line measuring device comprises preceding-stage sewage treatment equipment (2) and an ultraviolet light detecting unit (7), and is characterized in that sewage (1) is led in the preceding-stage sewage treatment equipment (2) by a pipeline and divided into two paths by a three-way valve after being treated by the preceding-stage sewage treatment equipment (2), wherein the first path is connected to a water collecting tank (5) by means of control of a first ball valve (4); the second path is connected to a bypass flow detecting tank (9) after suspended matters are filtered by a filter (8); the bypass flow of the bypass flow detecting tank (9) passes through the ultraviolet light detecting unit (7); the ultraviolet light detecting unit (7) performs COD measurement on the treated water filtered by the filter (8); and the measured water is mixed inside the water collecting tank (5) after passing through a second ball valve (11). The utility model provides a high-precision COD continuously-measuring device applied to sewage treatment.
Description
Technical field
The utility model relates to chemical oxygen level COD on-line measurement device in a kind of sewage disposal, particularly sewage disposal.
Background technology
Organism in the water has good sorption to the UV-light on the wavelength 221 nm-330nm wave bands, can have indirectly to reach by the detection to absorbancy and detect chemical oxygen level COD measurement in the water.Yet owing to have a small amount of suspended substance in the sewage disposal later stage water, affected the precision of opticmeasurement, because the sewage speciality is different, affected to a certain extent chemical oxygen level COD measuring accuracy in the water on the other hand.
In order to address this is that, existing method is that a wavelength is benchmark by the impact by the moving suspended substance of double wave regular way elimination ripples, and another wavelength detects, and reaches to improve chemical oxygen level COD measuring accuracy.
The utility model content
The purpose of this utility model provides the continuous COD measuring apparatus of chemical oxygen level in the high sewage disposal of a kind of precision.
The purpose of this utility model is to realize like this, the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal, comprise prime sewage disposal device 2 and UV-light detecting unit 7, it is characterized in that: sewage 1 is introduced prime sewage disposal device 2 by pipeline, be divided into two-way by T-valve 3 after prime sewage disposal device 2 is processed, the first via controls to water collecting basin 5 by the first ball valve 4; The second the tunnel filters rear arriving by 8 pairs of suspended substances of strainer shunts detection cell 9, shunting detection cell 9 is by being diverted to UV-light detecting unit 7, processing water after 7 pairs of UV-light detecting units filter by strainer 8 carries out COD to be measured, and the water after the measurement is sneaked into water collecting basin 5 after by the second ball valve 11.
Described strainer 8 is the type rotary shaft structure, and the filtering net 803 in the strainer 8 is divided into four groups, and along axle 801 circle distribution, axle 801 rotates, on the rotation axial organ; Water after prime sewage disposal device 2 is processed filters by filtering net 803, filtering net 803 is divided into four groups of rotations, the timesharing on four groups of filtering nets of water after the processing is passed through, and filtering net 803 is the releasable structure, is convenient for changing and scavenger precipitation throw out on the net.
Each group filtering net sinks in the filter circle 802, is sealed by sealing groove 804 between the filtering net.
Described UV-light detecting unit 7 comprises detection light source 10, interference filter 701, beam splitting prism 702, the first collimated light path 703, the second collimated light path 706, process water detection cell 704, standard water detection cell 707, process water and detect phototube 705, standard water detects phototube 708, detection light source 10 is by behind the interference filter 701, absorb the light of its commplementary wave length, only allow the UV-light of 257 wavelength pass through, the UV-light of 257 wavelength is divided into two-way by beam splitting prism 702, two-way each point 50%, two-way light is collimated into tiny light beam by the first collimated light path 703 and the second collimated light path 706, enter respectively and process water detection cell 704 and standard water detection cell 707, processing water detection cell 704 and standard water detection cell 707 opposite sides has respectively the water of processing to detect phototube 705 and standard water detection phototube 708, process the transmittance that water detects phototube 705 Check processing water, standard water detects the transmittance of phototube 708 examination criteria water, 12 pairs of standard water of controller and processing water carry out data analysis, computation of table lookup obtains processing the real-time COD amount of water, and the result sends to the watch-keeping cubicle.
Described standard water detection cell 707 is divided into the transparent pond 7073 of many groups, the transparent pond 7073 of many groups on disk 7071 around axle 7072 circle distribution, UV-light sees through different transparent ponds 7073 and has different detected results, transparent pond 7073 is the water quality that detects the various process water treatment that obtains by standard C OD detector, the uv transmittance data-storing in different transparent ponds is in database, to comparing with it when the transmittance of processing water, can obtain corresponding COD detected value.
Described controller 12 is to be made of a programmable logic controller 1203, programmable logic controller 1203 is connected with keyboard 1204, indicating meter 1202, the first motor-drive circuit 1209, the second motor-drive circuit 1210, processes water detection phototube amplifying circuit 1207, standard water detection phototube amplifying circuit 1208 and valve control 1206, drive the first motor-drive circuit 1209 and the second motor-drive circuit 1210 by control, make the position that filtering net and transparent pond 7073 are in to be needed; The signal that detects phototube amplifying circuit 1207, standard water detection phototube amplifying circuit 1208 to processing water is simultaneously processed, and the result is sent to master control room by communication port 1201.
Described programmable logic controller 1203 is connected with flow detection unit 1211, and the digital stream scale is connected on the exit of sewage 1.
Described programmable logic controller 1203 is connected with gsm communication module 1212, and the COD detected result sends to master control room in real time by gsm communication module 1212.
Principle of work of the present utility model is: the prime sewage disposal device is processed sewage, chemical oxygen level COD to water quality detects by standard cod detector, to a producer, water quality characteristic has certain repeatability, and this just provides resource for us for accurate continuous detecting or gap detection chemistry oxygen level cod is achieved.Standard water quality and quantity-produced disposed of sewage to be compared, and obtains the result.
The utility model is owing to increased strainer and the undulation wave absorption plate in early stage, reduced on the one hand the amount of suspended substance in the water, compare detection by standard water quality on the other hand, effectively really taken suspended substance and different quality to detecting the impact of easy formation, greatly improved accuracy of detection.
Description of drawings
The utility model is described in further detail below in conjunction with the embodiment accompanying drawing:
Fig. 1 is the utility model example structure synoptic diagram;
Fig. 2 is strainer 8 structural representations;
Fig. 3 is UV-light detecting unit 7 structural representations;
Fig. 4 is standard water detection cell 707 structural representations;
Fig. 5 is embodiment one structural representation of controller 12;
Fig. 6 is embodiment two structural representations of controller 12;
Fig. 7 is embodiment three structural representations of controller 12.
Among the figure: 1, sewage; 2, prime sewage disposal device; 3, T-valve; 4, the first ball valve; 5, water collecting basin; 6, undulation wave absorption plate; 7, UV-light detecting unit; 701, interference filter; 702, beam splitting prism; 703, the first collimated light path; 704, process the water detection cell; 705, process water and detect phototube; 706, the second collimated light path; 707, standard water detection cell; 7071, pond body; 7072, around axle; 7073, organize transparent pond more; 708, standard water detects phototube; 8, strainer; 801, axle; 802, filter circle; 803, filtering net; 804, sealing groove; 9, shunting detection cell; 10, detection light source; 11, the second ball valve; 12, controller; 1201, communication port; 1202, indicating meter; 1203, programmable logic controller; 1204, keyboard; 1205, power supply; 1206, valve control; 1207, process water and detect the phototube amplifying circuit; 1208, standard water detects the phototube amplifying circuit; 1209, the first motor-drive circuit; 1210, the second motor-drive circuit; 1211, flow detection unit; 1212, gsm communication module.
Embodiment
As shown in Figure 1, the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal, comprise prime sewage disposal device 2 and UV-light detecting unit 7, sewage 1 is introduced prime sewage disposal device 2 by pipeline, be divided into two-way by T-valve 3 after prime sewage disposal device 2 is processed, the first via controls to water collecting basin 5 by the first ball valve 4; The second the tunnel filters rear arriving by 8 pairs of suspended substances of strainer shunts detection cell 9, shunting detection cell 9 is by being diverted to UV-light detecting unit 7, processing water after 7 pairs of UV-light detecting units filter by strainer 8 carries out COD to be measured, and the water after the measurement is sneaked into water collecting basin 5 after by the second ball valve 11.
As shown in Figure 2, strainer 8 is the type rotary shaft structure, and the filtering net 803 in the strainer 8 is divided into four groups, and along axle 801 circle distribution, axle 801 rotates, on the rotation axial organ.Water after prime sewage disposal device 2 is processed filters by filtering net 803, filtering net 803 is divided into four groups of rotations, the timesharing on four groups of filtering nets of water after the processing is passed through, and filtering net 803 is the releasable structure, is convenient for changing and scavenger precipitation throw out on the net.When axle 801 when the deceleration of speed reduction unit is rotated, when rotating a circle such as one hour, replaceable to not entering the filtering net that filters the pool.Each group filtering net sinks in the filter circle 802, is sealed by sealing groove 804 between the filtering net.
As shown in Figure 3, UV-light detecting unit 7 comprises light source 10, interference filter 701, beam splitting prism 702, the first collimated light path 703, the second collimated light path 706, process water detection cell 704, standard water detection cell 707, process water and detect phototube 705, standard water detects phototube 708, light source 10 is by behind the interference filter 701, absorb the light of its commplementary wave length, only allow the UV-light of 257 wavelength pass through, the UV-light of 257 wavelength is divided into two-way by beam splitting prism 702, two-way each point 50%, two-way light is collimated into tiny light beam by the first collimated light path 703 and the second collimated light path 706, enter respectively and process water detection cell 704 and standard water detection cell 707, processing water detection cell 704 and standard water detection cell 707 opposite sides has respectively the water of processing to detect phototube 705 and standard water detection phototube 708, process the transmittance that water detects phototube 705 Check processing water, standard water detects the transmittance of phototube 708 examination criteria water, 12 pairs of standard water of testing circuit and processing water carry out data analysis, computation of table lookup obtains processing the real-time COD amount of water, and the result sends to the watch-keeping cubicle.Process water and enter at last water collecting basin 5.
As shown in Figure 4, standard water detection cell 707 is divided into the transparent pond 7073 of many groups, the transparent pond 7073 of pond body 7071 interior many groups is around axle 7072 circle distribution, UV-light has different detected results to the transparent pond 7073 of difference, transparent pond 7073 is the water quality that detects the various process water treatment that obtains by standard C OD detector, the uv transmittance data-storing in different transparent ponds is in database, to comparing when the transmittance of pre-treatment water and the data of standard water detection cell 707, can obtain the COD detected value of correspondence.
The power supply 1205 of controller 12 artificially cuts off to prevent power supply system with the adapted power supply.
The sewage treatment process that the prime sewage disposal device adopts divides three grades: coagulation: by mechanical treatment, such as grid, precipitation or air supporting, remove contained stone, sandstone and fat, grease etc. in the sewage.Second-stage treatment: biological treatment, the pollutent in the sewage is degraded under the effect of microorganism and is converted into mud.Tertiary treatment: the advanced treatment of sewage, it comprises nutraceutical removal and by chlorination, uv-radiation or ozone technology sewage is carried out disinfection.May be according to the target of processing and water quality different, the sewage treatment process that has not is to comprise above-mentioned all processes.
Coagulation-mechanical treatment workshop section.Machinery (one-level) is processed workshop section and is comprised the structures such as grid, settling pit, preliminary sedimentation tank, to remove big particle and suspended substance as purpose, the principle of processing is to realize solid-liquid separation by Physical that pollutent is separated, and this is the sewage treatmentmethod that generally adopts from sewage.It is the indispensable engineerings (although preliminary sedimentation tank is saved in some technical process sometimes) of all sewage treatment process that machinery (one-level) is processed, and the typical clearance of municipal effluent coagulation BOD5 and SS is respectively 25% and 50%.In biological dephosphorize denitrification type sewage work, generally do not recommend aerated grit chamber, to avoid the fast degradation organic matter removal; Be unfavorable at the raw waste water water quality characteristic in the situation of dephosphorization denitrogenation, just heavy setting whether and set-up mode need to be carefully analyzed according to the subsequent technique of water quality characteristic and be considered, to guarantee and to improve dephosphorization except the influent quality of the subsequent techniques such as denitrogenation.
Second-stage treatment-sewage biochemical treatment
The sewage biochemical treatment belongs to second-stage treatment, can not sink suspended substance and solvability biodegradable organic as main purpose to remove, its technique consists of varied, can be divided into the multiple treatment processs such as activated sludge process, AB method, A/O method, A2/O method, SBR method, oxidation ditch process, stabilization pond method, soil facture.Most cities sewage work all adopts activated sludge process a few days ago.The principle of biological treatment is by biological action, especially the effect of microorganism, finish the synthetic of organic decomposition and organism, organic pollutant is transformed into harmless gaseous product (CO2), product liquid (water) and is rich in organic solid product (microbial population or title biological sludge); Unnecessary biological sludge through the settling tank solid-liquid separation, is removed the sewage after purifying in settling tank.
In biochemical processing procedure of sewage, the factor that affects microorganism active can be divided into the matrix class and environmental classes two large class matrix classes comprise nutritive substance, as take carbon as main organic compound being the trace elements such as the nutritive substance such as carbon source material, nitrogenous source, phosphorus source and iron, zinc, manganese; In addition, also comprise the compounds such as some toxic and harmful substances such as phenols, benzene class, also comprise some heavy metal ion such as copper, cadmium, lead ion etc.
Temperature is very widely on the impact of microorganism, although the bacterium that is also enlivening some class in hot environment (50 ℃～70 ℃) and low temperature environment (5～0 ℃), the temperature range of most microorganism optimum growths is 20-30 ℃ in the sewage disposal.In suitable temperature range, the physiological activity of microorganism is vigorous, increasing of its activity with temperature and strengthening, and treatment effect is also better.Exceed this scope, the microbic activity variation, bioprocesses will be influenced.General, control the highest of reaction process and minimum 5 and be respectively 35 ℃ and 10 ℃.
The optimum pH value scope of Sludge System microorganism is 6.5-8.5, and the acid or excessively strong environment of alkalescence all is unfavorable for existence and the growth of microorganism, when serious the mud flco is destroyed, and zoogloea disintegrates, and treatment effect sharply worsens.
Concerning the aerobe reaction, certain density dissolved oxygen is most important in the maintenance mixed solution.When the dissolved oxygen in the environment was higher than 0.3mg/l, amphimicrobe and aerobic bacteria all carried out aerobic respiration; When dissolved oxygen is lower than 0.2-0.3mg/l close to zero the time, amphimicrobe then changes anaerobic respiration over to, overwhelming majority aerobic bacterias cease breathing substantially, and have the part aerobic bacteria (most for thread fungus) also may well-grown, often cause sludge bulking occupy advantage in system after.General, the dissolved oxygen in exit, aeration tank is advisable about 2mg/l keeping, and the too high energy consumption that then increases is uneconomical economically.
In all influence factors, matrix class factor and pH value are decided by influent quality, to the control of these factors, mainly by daily monitoring and the strict implement of relevant regulations, rules.For general municipal effluent, these factors mostly can not consist of too much influence, and each parameter can maintain in the proper range substantially.The variation of temperature is relevant with weather, for the municipal sewage plant of ton, when particularly adopting activated sludge process, the control of temperature is difficult to carry out, economically be not very feasible on the engineering.Therefore, generally be the processing requirements of suitably choosing to satisfy the differing temps variation by design variable, to reach processing target.Therefore, the major objective of technology controlling and process just drop on active sludge itself and the environmental factors that can change by control measures on, the main task of control is exactly to take suitable measure, overcomes extraneous factor to the impact of Sludge System, can play a role sustainedly and stably.
Realization is control object or control adopting parameters to the process control key of bio-reaction system, and this is closely related with treatment process or processing target.
Before to have addressed dissolved oxygen be very important indication parameter in biological respinse type and the process, it can be intuitively and more promptly reflects the operation conditions of whole system, operational management is convenient, the installation of instrument, instrument and safeguard also simplyr, this also is the reason that nearly ten years newly-built sewage works of China have substantially all realized the on-the-spot and on-line monitoring of dissolved oxygen.
Tertiary treatment is the advanced treatment to water, and the sewage work of present China drops into practical application and few.It will carry out denitrogenation, dephosphorization treatment through the water of second-stage treatment, with the residual contamination thing in the removal water such as active carbon adsorption or reverse osmosis method, and with ozone or chlorine disinfectant kill bacteria and virus, then will process water and send into middle water channel, as water sources such as toilet flushing, sprinkling street, pouring green belt, process water, fire prevention.
This shows, the effect of sewage treatment process only is by biological degradation transformation and solid-liquid separation, when sewage is purified with enriching pollutants in mud, comprise the chemical sludge that primary sludge that coagulation workshop section produces, residual active sludge that second-stage treatment workshop section produces and tertiary treatment produce.Because these mud contain a large amount of organism and pathogenic agent, and very easily corrupt smelly, are easy to cause secondary pollution, the task of decontamination is not yet finished.Mud must properly be disposed through certain subtract appearance, decrement and stabilization harmless treatment well.The success or not of ﹠ Mud has important impact to Sewage Plant, must pay attention to.If mud is not processed, mud will be had to the water outlet discharging after processing, and the decontamination effect improving of Sewage Plant also will be cancelled.So in the application process of reality, the sludge treatment in the sewage treatment process also is quite crucial.
Claims (8)
1. the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal, comprise prime sewage disposal device (2) and UV-light detecting unit (7), it is characterized in that: sewage (1) is introduced prime sewage disposal device (2) by pipeline, be divided into two-way by T-valve (3) after prime sewage disposal device (2) is processed, the first via controls to water collecting basin (5) by the first ball valve (4); The second the tunnel filters rear to shunting detection cell (9) by strainer (8) to suspended substance, shunting detection cell (9) is by being diverted to UV-light detecting unit (7), UV-light detecting unit (7) carries out cod to the processing water after filtering by strainer (8) to be measured, and the water after the measurement is sneaked into water collecting basin (5) after by the second ball valve (11).
2. the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal according to claim 1, it is characterized in that: described strainer (8) is the type rotary shaft structure, filtering net (803) in the strainer (8) is divided into four groups, along axle (801) circle distribution, axle (801) rotates, on the rotation axial organ; Water after prime sewage disposal device (2) is processed filters by filtering net (803), filtering net (803) is divided into four groups of rotations, the timesharing on four groups of filtering nets of water after the processing is passed through, filtering net (803) is the releasable structure, is convenient for changing and scavenger precipitation throw out on the net.
3. the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal according to claim 2 is characterized in that: each group filtering net sinks in the filter circle (802), is sealed by sealing groove (804) between the filtering net.
4. the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal according to claim 1, it is characterized in that: described UV-light detecting unit (7) comprises detection light source (10), interference filter (701), beam splitting prism (702), the first collimated light path (703), the second collimated light path (706), process water detection cell (704), standard water detection cell (707), process water and detect phototube (705), standard water detects phototube (708), detection light source (10) is by behind the interference filter (701), absorb the light of its commplementary wave length, only allow the UV-light of 257 wavelength pass through, the UV-light of 257 wavelength is divided into two-way by beam splitting prism (702), two-way each point 50%, two-way light is collimated into tiny light beam by the first collimated light path (703) and the second collimated light path (706), enter respectively and process water detection cell (704) and standard water detection cell (707), processing water detection cell (704) and standard water detection cell (707) opposite side has respectively the water of processing to detect phototube (705) and standard water detection phototube (708), process the transmittance that water detects phototube (705) Check processing water, standard water detects the transmittance of phototube (708) examination criteria water, controller (12) carries out data analysis to standard water and processing water, computation of table lookup obtains processing the real-time COD amount of water, and the result sends to the watch-keeping cubicle.
5. the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal according to claim 4, it is characterized in that: described standard water detection cell (707) is divided into many groups transparent pond (7073), many transparent ponds of group (7073) are around axle (7072) circle distribution in the body of pond, UV-light sees through different transparent ponds (7073) and has different detected results, transparent pond (7073) is the water quality that detects the various process water treatment that obtains by standard C OD detector, the uv transmittance data-storing in different transparent ponds is in database, to comparing with it when the transmittance of processing water, can obtain corresponding COD detected value.
6. the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal according to claim 4, it is characterized in that: described controller (12) is to be made of a programmable logic controller (1203), programmable logic controller (1203) is connected with keyboard (1204), indicating meter (1202), the first motor-drive circuit (1209), the second motor-drive circuit (1210), process water and detect phototube amplifying circuit (1207), standard water detects phototube amplifying circuit (1208) and valve control (1206), drive the first motor-drive circuit (1209) and the second motor-drive circuit (1210) by control, make the position that filtering net and transparent pond (7073) are in to be needed; The signal that detects phototube amplifying circuit (1207), standard water detection phototube amplifying circuit (1208) to processing water is simultaneously processed, and the result is sent to master control room by communication port (1201).
7. the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal according to claim 6, it is characterized in that: described programmable logic controller (1203) is connected with flow detection unit (1211), and the digital stream scale is connected on the exit of sewage (1).
8. the continuous COD measuring apparatus of chemical oxygen level in the sewage disposal according to claim 6, it is characterized in that: described programmable logic controller 1203 is connected with gsm communication module (1212), and the COD detected result sends to master control room in real time by gsm communication module (1212).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220536932 CN202865066U (en) | 2012-10-19 | 2012-10-19 | Chemical oxygen demand (COD) on-line measuring device applied to sewage treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220536932 CN202865066U (en) | 2012-10-19 | 2012-10-19 | Chemical oxygen demand (COD) on-line measuring device applied to sewage treatment |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220559183 Division CN202916190U (en) | 2012-10-19 | 2012-10-19 | Chemical oxygen demand online ultraviolet light detection device for wastewater treatment |
| CN 201220559182 Division CN202956338U (en) | 2012-10-19 | 2012-10-19 | Standard water detection device used for wastewater treatment |
| CN 201220559184 Division CN202909541U (en) | 2012-10-19 | 2012-10-19 | Filtrating device for COD (Chemical Oxygen Demand) online measurement of wastewater treatment |
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| CN202865066U true CN202865066U (en) | 2013-04-10 |
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| CN 201220536932 Expired - Fee Related CN202865066U (en) | 2012-10-19 | 2012-10-19 | Chemical oxygen demand (COD) on-line measuring device applied to sewage treatment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106596434A (en) * | 2016-12-26 | 2017-04-26 | 成都冠禹科技有限公司 | Water quality detecting system |
| CN108956520A (en) * | 2018-06-14 | 2018-12-07 | 杭州超钜科技有限公司 | The portable CO of seismic precursor mobile observation2Monitoring device and monitoring method |
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2012
- 2012-10-19 CN CN 201220536932 patent/CN202865066U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596434A (en) * | 2016-12-26 | 2017-04-26 | 成都冠禹科技有限公司 | Water quality detecting system |
| CN106596434B (en) * | 2016-12-26 | 2020-01-03 | 高安水务有限公司 | Water quality detection system |
| CN108956520A (en) * | 2018-06-14 | 2018-12-07 | 杭州超钜科技有限公司 | The portable CO of seismic precursor mobile observation2Monitoring device and monitoring method |
| CN108956520B (en) * | 2018-06-14 | 2024-04-19 | 杭州超钜科技有限公司 | Portable CO for dynamic observation of Megacurrent before earthquake2Monitoring device and monitoring method |
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Granted publication date: 20130410 Termination date: 20141019 |
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