CN204918062U - Chloroform's separator in groundwater - Google Patents
Chloroform's separator in groundwater Download PDFInfo
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- CN204918062U CN204918062U CN201520404649.XU CN201520404649U CN204918062U CN 204918062 U CN204918062 U CN 204918062U CN 201520404649 U CN201520404649 U CN 201520404649U CN 204918062 U CN204918062 U CN 204918062U
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- trichloromethane
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Abstract
The utility model discloses a chloroform's separator in groundwater, surging the pond and being cut off by the cell body and cut apart the shock that becomes to be more than the corridor of surging including vibrating surge pond, inlet tube and outlet pipe, vibrating, each vibrates the parallel derangement in corridor that surges, link up the S type that forms passageway end to end, and every shock is surged the one end in corridor and is equipped with and vibrates the device of surging, vibrates the device of surging and surges board and reciprocating lever sliding connection by the shock and constitute. It is equipped with jet -propelled pipeline to surge bottom of the pool portion in the shock, jet -propelled pipeline comprises the jet -propelled small transfer line of jet -propelled trunk line and at least one, is provided with at least one jet -propelled shower nozzle on the jet -propelled small transfer line. All jet -propelled small transfer lines of jet -propelled trunk line intercommunication, jet -propelled shower nozzle sets up on jet -propelled small transfer line. Still include the one end setting in the shock bottom of the pool portion that surges, other end setting is at the back flow of inlet channel department. The device has adopted the gas exhalation, has vibrate the combination treatment mode of surging, and the treatment effeciency is high, convenient operation.
Description
Technical field
The utility model belongs to technical field of environment protection equipment, especially containing the treatment facility of trichloromethane underground water, is specifically related to the tripping device of trichloromethane in a kind of underground water.
Background technology
Trichloromethane is organic synthesis raw material, is mainly used to produce fluorine Lyons (F-21, F-22, F-23), dyestuff and medicine, medically, is commonly used for narcotic.Can be used as microbiotic, spices, grease, resin, the solvent of rubber and extraction agent.Colourless transparent liquid.There is special odor.Taste is sweet.High refractive power, does not fire, matter weight, volatile.Sterling, to photaesthesia, is met illumination meeting and the oxygen effect in air, is decomposed gradually and generate hypertoxic phosgene (carbonyl chloride) and hydrogenchloride.The ethanol used as stabilizers of 0.6% ~ 1% can be added.Can miscible with ethanol, benzene, ether, sherwood oil, tetracol phenixin, dithiocarbonic anhydride and oils etc., 25 DEG C time 1ml be dissolved in 200ml water.Relative density 1.4840.-63.5 DEG C, zero pour.Boiling point 61 ~ 62 DEG C.Refractive index 1.4476.Low toxicity, medium lethal dose (rat, per os) 1194mg/kg.There is narcoticness.There is carcinogenic possibility.
Its chemical property of trichloromethane is more stable, in nature energy long-term existence, and is considered to a kind of carcinogenic substance.In the U.S. 129 priority acccess control the monitoring of pollutent and China 58 kinds of Environment Priorities with in the organism controlled, trichloromethane is all positioned at prostatitis.EPA was once detected 39 samll cities and towns' groundwater supply waterhead areas, result shows, processing or all finding in untreated underground water 11 kinds of volatility chloro chain hydrocarbons, namely what recall rate was the highest is trichloromethane and trieline, is respectively 31% and 36%.Wherein the most seriously the Nassau county of New York and Sufilk county, 3000000 populations are unique drinking water source with underground water, because underground water is by the pollution of trichloromethane, zellon, trieline and other volatile organic compounds, more than 100 public or not common supply well is forced to close.As the Germany of typical industrial country, in organic contamination, the hydrochloric ethers such as trichloromethane pollute and account for about 60%.
Due to the relative stability of trichloromethane and the special conditions of groundwater environment, make the Pollution abatement difficulty compared with common Pollution control technology containing trichloromethane underground water larger, therefore underground water trichloromethane Pollution control technology just becomes focus and the difficulties in global study of groundwater field.
At present about the traditional method of trichloromethane Pollution abatement in underground water has following several:
1. surfactant-modified geomaterial treatment technology
The method is injected in subterranean strata by tensio-active agent, form because adsorption tensio-active agent is adsorbed to rock layer surface the absorption system that has more adsorptive power, and then strengthen subterranean strata to the adsorptive power of the hydrochloric ethers such as the trichloromethane in underground water.Its treatment effect produces difference along with subterranean strata physical properties difference.In general, the adsorptive power that the subterranean strata of non-modified has is more weak, and modified adsorptive power strengthens, and treatment effect is good.
Compared with additive method, this technology is simple, but will noxious substance to rock stratum be just only a pure physical process, and not eradicating pests matter, therefore just must can reach good treatment effect in conjunction with other method.
2. ultrasonication trichloromethane
Organic research in the water of supersonic method process is in recent years active gradually.Supersonic method process organism is mainly activated under ul-trasonic irradiation based on the small gas core in liquid, thus causes ultrasonic cavitation, and organism can directly at bubble combustion or the thermal decomposition of cavitation.Its reaction mechanism is that ultrasonic wave produces localized hyperthermia, water is broken down into-OH free radical in high temperature environments, be dissolved in oxygen and nitrogen in underground water and the free nitrogen-atoms of free radical cracking generation and free Sauerstoffatom free radical also can occur, these free radicals can promote the chain rupture of organic molecule, the transfer of free radical and redox reaction further.
The underground water utilizing supersonic method process trichloromethane to pollute is a frontier of rising in recent years, also belong to the exploratory stage at present, make it develop into a kind of groundwater treatment technology of maturation, also need to transfer in engineer applied do further exploration in air Injection, small-scale test.
3. biology in situ recovery technique
Biology in situ reparation is the engineering technology system utilizing the Metabolic activity polluting live biometric to reduce poisonous and harmful compound in site environment.It mainly utilizes biology and provides required condition by the Growth and reproduction that engineering measure is biology, thus accelerates the biological degradation of pollutent and remove a kind of engineering techniques of speed.
Compared with physico-chemical processes, biology in situ recovery technique has the advantage of its uniqueness, the organism such as the trichloromethane in underground water just can be degraded by microorganisms elimination at the scene, treatment in situ operates, little to the eco-environmental impact of surrounding, reach that same treatment effect spent time is short, rehabilitation cost is low, it expends and only accounts for 30% ~ 50% of conventional physical method and chemical method expense, bioremediation technology does not produce secondary pollution, and leftover problem is also less.
But this method is started late at home, at present domestic there is not been reported for the extensive case history administering trichloromethane polluted underground water, and therefore this method needs research further and exploring.
4. permeable reactive wall repairing method
Utilize and be filled with the dependent response district of Active reaction medium material, when contaminated underground water by time, pollution substance wherein and reaction medium generation physics, chemistry and biological etc. act on and be degraded, adsorb, precipitate or remove, thus sewage is purified.
But permeable coefficient tensor exists easily blocked, the its native environmental conditions such as the redox potential of underground water easily go to pot, shortcoming such as reaction wall engineering measure and running maintenance relative complex etc., add that bimetallic systems, nanotechnology cost are higher, these factors hinder further developing of permeable coefficient tensor and widely popularize.
Summary of the invention
In order to overcome above the deficiencies in the prior art, the utility model provides the tripping device of trichloromethane in a kind of underground water, for the treatment of the underground water containing trichloromethane.
To achieve these goals, the technical solution adopted in the utility model is as follows:
The tripping device of trichloromethane in a kind of underground water, comprise concussion to surge pond, water inlet pipe and rising pipe, concussion pond of surging is cut off by pond body and is divided into more than one concussion to surge path, each concussion is surged the arrangement of path parallel misalignment, be formed through S type passage end to end, the surge one end in path of each concussion is provided with concussion and surges device, and concussion device of surging is slidably connected is formed by surge plate and reciprocating lever of concussion.
Preferably, earthquake is surged bottom pond and is provided with jet pipe, and described jet pipe is made up of jet main pipeline and at least one jet small transfer line, jet small transfer line is provided with at least one jet shower nozzle.Jet main pipeline is communicated with all jet small transfer lines, and jet shower nozzle is arranged on jet small transfer line.
Preferably, comprise return line, its one end is arranged on concussion and surges bottom pond, and the other end is arranged on inlet channel place.
Preferably, earthquake surge pond pool wall on be provided with forms.
Shake device parallel misalignment of surging to arrange.
Shake plate of surging and do horizontal reciprocating movement under the effect of reciprocating lever, its effective stroke is 100 ~ 2200 millimeters, is preferably 400 ~ 600 millimeters.
Jet shower nozzle is the jet shower nozzle of porous air blowing aluminium alloy.
Adopt the utility model tripping device to be separated trichloromethane in underground water, its process control condition is: quantity of reflux is 50 ~ 80m
3/ min, water level 50 ~ 80cm, concussion surge the cycle 10 ~ 20 beats/min, concussion surge plate stroke be 400 ~ 600mm, adopt continue jet mode.
The utility model discloses the tripping device of trichloromethane in underground water, built-up type treatment process (+jet oxidation system of surging is shaken in bottom) is utilized to remove trichloromethane in water body, the pending underground water containing trichloromethane is entered system from inlet channel, then the effect of surging by shaking device of surging makes the water body containing trichloromethane, accelerates gasification and evaporation under certain shock range and frequency; Meanwhile, the jet pipe jet shower nozzle distributed on multiple jet small transfer line continues ejection atomizing gas, and vaporizing to impel trichloromethane promotes water body to contact with fresh air and impel trichloromethane to be separated.
Device principle of work of surging is shaken in pond
By the method for machinery, disturbance is carried out to the water surface, the water surface can produce and surge accordingly, if manual intervention produces regular disturbance, the water surface then produces the sine wave with disturbance with same frequency, if manual intervention produces non-regularity disturbance, then the water surface produces in disorder, irregularities and surges.As shown in Figure 1, shake device of surging and pass through computer control, waling stripe is driven to do iterative motion in the one end in pond, produce corresponding resonance at the water surface to surge, the speed that the height of its crest and waling stripe move and stroke are proportionate, and the cycle that its wavelength and waling stripe move is proportionate.The concussion arranged in pond is surged apparatus system, can promote the evaporation of Organic substance in water, promote the dissolving of oxygen in air to make organism obtain sufficient oxygenolysis.
In the underground water that the utility model provides, the tripping device of trichloromethane is not limited to the separation of the trichloromethane being applied in underground water, be equally applicable to organic removal in other water bodys (underground water, chemical engineering sewage etc.), described organism includes but not limited to trichloromethane, ethanol, ether, acetone etc.
Trichloromethane separation system disclosed in the utility model, its advantage is:
(1) to surge combination treatment mode owing to have employed jet, concussion, its processing efficiency is high, has higher removal effect for high density containing the volatile organic matter in trichloromethane underground water.
(2) earthquake is surged in oxidation processes, tank is cut off by pond body and is divided into multiple concussion to surge pond, containing trichloromethane underground water with S type path flows, add the duration of contact of water body and treatment facility, add the contact area containing trichloromethane underground water and oxygen simultaneously, improve processing efficiency.
The utility model is on the basis that previous research work in-depth is summed up, to process groundwater sources trichloromethane zone of pollution for object, for the deficiency that existing treatment technology exists, propose a kind of jet atomization to add concussion and surge treatment unit that trichloromethane is separated in treating processes, the relatively existing application treatment facility of this device and technique have significantly innovates improvement, especially its superiority more outstanding in process underground reservoir, this device processing efficiency is high, handled easily, automatic production can be realized, this is the underground water of extensive process deep layer containing organic pollutant, a kind of high-efficient development prospect is provided.
Accompanying drawing explanation
Fig. 1 is the principle of work schematic diagram of the tripping device of trichloromethane in underground water;
Fig. 2 is the perspective view of the tripping device of trichloromethane in underground water;
Fig. 3 is the vertical view of the jet pipe of the tripping device of trichloromethane in underground water;
Fig. 4 is the bottom plan view of the tripping device (not comprising jet pipe part) of trichloromethane in underground water;
Fig. 5 is the positive elevational schematic view of the tripping device of trichloromethane in underground water;
Fig. 6 is trichloromethane removal behavior graphic representation;
Fig. 7 is the effect diagram that quantity of reflux is removed trichloromethane;
Fig. 8 is that concussion is surged device electrical control system.
Wherein: 1 is water inlet pipe, 2 to surge pond for concussion, and 3 is reciprocating lever, and 4 to surge plate for concussion, and 5 is jet main pipeline, 6 is jet small transfer line, and 7 is jet shower nozzle, and 8 is gauging line of surging, and 9 is pond body partition, 10 is return line, and 11 is rising pipe, and 12 is forms, and 13 is pool wall.
Embodiment
Below in conjunction with accompanying drawing, the trichloromethane separation system that the utility model provides is further described.
Embodiment 1
The tripping device of trichloromethane in underground water, as shown in Figure 2, comprise concussion to surge pond 2, water inlet pipe 1 and rising pipe 11, concussion pond 2 of surging is cut off 9 by pond body and is divided into more than one concussion to surge path, each concussion is surged the arrangement of path parallel misalignment, be formed through S type passage end to end, the surge one end in path of each concussion is provided with concussion and surges device, and concussion device of surging is slidably connected forms by shaking surge plate 4 and reciprocating lever 3.
As shown in Figure 3, earthquake is surged bottom pond 2 and is provided with jet pipe, jet pipe comprises jet main pipeline 5 and jet small transfer line 6, wherein the quantity of jet small transfer line 6 is greater than one, jet main pipeline 5 is communicated with all jet small transfer lines 6, jet shower nozzle 7 is arranged on jet small transfer line 6, and jet shower nozzle 7 adopts porous nozzle.Jet small transfer line 6 and jet shower nozzle 7 earthquake are surged bottom pond in arranged in parallel.Meanwhile, the jet shower nozzle 7 that jet pipe distributes on multiple jet small transfer line continues ejection gas, and vaporizing to impel trichloromethane promotes water body to contact with fresh air and impel trichloromethane to be separated.
As shown in Figure 4, tripping device shakes pond bottom schematic view of surging, can find out, concussion pond 2 of surging is cut off 9 by multiple ponds body and is divided into multiple concussion to surge path, multiple concussion is surged the arrangement of path parallel misalignment, through end to end, the surge one end in path of each concussion is provided with a concussion and surges device, shake contraposition between device of surging to arrange, concussion device to-and-fro movement of surging produces and surges in path, promote trichloromethane evaporation and oxygenolysis, impel simultaneously water body along concussion surge path present S type flowing, treated water body up to standard is discharged by being arranged at rising pipe 11 high position of shaking one end, pond 2 of surging.The liquid be not separated completely returns to the position at water inlet pipe 1 place again from return line 10, carries out secondary treatment until up to standardly discharge system from rising pipe 11.In figure, 8 are expressed as the gauging line of surging in trichloromethane separating treatment process.
Pending underground water enters concussion from water inlet pipe 1 and to surge pond 2, shake 2, pond water body treatment chamber of surging, concussion plate of surging is driven to move reciprocatingly by the surge reciprocating lever 3 of device of concussion, water body containing trichloromethane is produced periodically surge, under certain shock range and frequency, accelerate gasification and evaporation; Meanwhile, gas is entered by jet main pipeline 5, and is assigned on multiple jet small transfer line 6, continues ejection gas through jet shower nozzle 7, vaporize to impel trichloromethane and promote water body to contact with fresh air and impel trichloromethane to be separated, eventually through rising pipe 11 by water removal system up to standard.Earthquake surge pond 2 pool wall 13 on be provided with forms 12, effectively can spread isolated trichloromethane.
Above tripping device is utilized to be separated trichloromethane in water body.First the water containing trichloromethane is driven in system by water inlet pipe 1, by shaking the to-and-fro movement of device of surging, formed in water surface and surge and spray, fresh air is incorporated water body and promote that air is combined with organism and carries out oxygenolysis, surging of simultaneously producing promotes the evaporation of trichloromethane further.The concussion concussion of surging in pond 2 in each path is surged device, impels containing trichloromethane underground water with S type path flows, and produces a large amount of bubble and impel trichloromethane to evaporate; Water body, with S type path flows, increases water body and exposes action time, trichloromethane is separated from water body.
Further, by air jet system to injecting gas in water, be separated from water body to accelerate trichloromethane in water.
Above-mentioned concussion device of surging is controlled by hydraulic levels drive system and device software in concrete use, and constitution equipment software support comprises main frame, controller, displacement sensor, signal change device.
Hydraulic levels drive system comprises electro-hydraulic pump, the output rating of its operating pressure 150bar, 50KW; Auto-adjustment control valve, can regulate piping flow and pressure as required automatically, and driving arrangement runs well; Cooling-water pump for maintain apparatus cools cooling, running up of reciprocation pump, make device temperature continue raise, when system temperature is elevated to 70 DEG C, thermo-relay start, impel cooling pump work, to concussion surge device cooling.
Hydraulic levels drive system is connected with 4 high-voltage oil cylinders by electro-hydraulic pump, adjusting control valve, high-pressure line, 4 oil cylinders plate of surging with 4 pieces of plug-type concussions is respectively connected, and drive plate of surging to do horizontal reciprocating movement, its effective stroke 100 ~ 2200 millimeters, controllable adjustment between reciprocating frequency 10 ~ 100 hertz, the stroke of oil cylinder reciprocating motion and motion frequency, pass to concussion to surge controller by surge feedback signal that plate displacement sensor produces of concussion, realize the effective control to cylinder movement state.
When concussion surge device start working time, 4 pieces of plug-type concussions are surged the reciprocating stroke of plate, the coherent signals such as motion frequency feed back backhaul signals by displacement sensor, computer is passed to through signal converter conversion, computer judges that producing control signal sends instruction by controller by analysis, the control signal sent is supplied to hydraulic oil pump through main valve controller, control oil cylinder according to enroll program promote concussion surge plate motion, concussion can be realized by computer control and surge that to produce two dimension sinusoidal wave for plate, thomas's ripple, oblique wave, three-dimensional wave, as shown in Figure 8.
Embodiment 2
In order to the reasonableness of test design, it is made to reach best treatment effect, the tripping device of trichloromethane in the underground water of embodiment 1 is carried out orthogonal test to the test of trichloromethane clearance and influence factor, and verify the reasonableness designed and optimal operating parameter, test-results is as follows:
1. shake the impact that plate stroke of surging is removed trichloromethane
In simulation trichloromethane separation system, adding trichloromethane concentration is 100 μ g/L, control simulation system shakes surge plate stroke 400mm, 500mm, 600mm, recording each concussion surges under plate travel condition, trichloromethane clearance, as shown in Figure 6, trichloromethane clearance and timing relationship is reflected with trichloromethane clearance and the change curve of time.Wherein ordinate zou is trichloromethane clearance, for characterizing the removal effect of trichloromethane.Find out in figure that the rising that trichloromethane is removed with shaking plate stroke of surging constantly increases, wherein under 600mm, 7min state, the clearance of trichloromethane reaches 69%, after 15 hours, the clearance of trichloromethane reaches 97%, therefore, equipment can effectively be improved to trichloromethane clearance by improving concussion plate stroke of surging.
2. quantity of reflux impact that trichloromethane is removed
In simulation spray pond device, adding trichloromethane concentration is 100 μ g/L, and control simulation quantity of reflux is 20m
3, 30m
3, 40m
3, under recording each quantity of reflux condition, trichloromethane clearance, is illustrated in figure 7 the impact that quantity of reflux is removed trichloromethane, and under being depicted as three kinds of different quantity of reflux, trichloromethane clearance effect, from the trend of its broken line, when quantity of reflux is 40m
3time, trichloromethane clearance is the highest, and this system is best to the removal effect of trichloromethane.Experiment draws, quantity of reflux is comparatively large on the impact of trichloromethane clearance, and the surge quantity of reflux of pond reaction and time of jet concussion presents positive correlation, and under identical experiment quantity of reflux condition, the clearance of aeration time trichloromethane more of a specified duration is larger; Simultaneously under identical action time, the clearance of the higher trichloromethane of quantity of reflux is larger.(quantity of reflux described in the utility model refers to that the liquid be not separated completely returns the liquid volume of carrying out secondary treatment again from return line 10.）
3. quadrature factor hydraulic test
Utilize orthogonal test, the experimental result of simulation trichloromethane separation system is analyzed and researched, in tripping device, concussion cycle, quantity of reflux, concussion plate stroke of surging of surging is major influence factors, three factors have different impacts to equipment use efficiency, according to these three factorial effect scopes, the experimental factor and the level design that set them are shown in Table 1.
Table 1:
Produce test design scheme, totally 15 test points; Its 12 is analysis site, point centered by 3, according to conceptual design test, bears results.
4. orthogonal experiments analysis
Adopt orthogonal test analysis method, to shake the cycle of surging, quantity of reflux, concussion surge plate stroke Three factors for conditional-variable, with the clearance of trichloromethane for response value, is optimized the ambient conditions that the trichloromethane of separation system is removed.Carry out testing rear acquired results according to orthogonal experimental design scheme as shown in table 2.
Table 2:
5. the foundation of regression model and test of significance
Quadratic polynomial equation by least square fitting:
（1）
In formula:
qCL-predicated response value;
z i with
z j -independent variable(s) code value;
β 0 -constant term;
β i -linear coefficient;
β ij -mutual term coefficient;
β ii -quadratic term coefficient;
ε-random error.
After his-and-hers watches 5 data carry out multiple regression matching, obtain clearance (
qCL) surge the cycle with concussion (
z 1 ), quantity of reflux (
z 2 ), concussion surge plate stroke (
z 3 ) regression equation:
QCL=2.151-0.045z 1 +0.078z 2 +0.027z 3 +0.049z 1 z 2 -9.077×10 -3 z 1 z 3 +0.096z 2 z 3 +5.6×10 -4 z 1 2 -0.18z 2 2 -0.088z 3 2 （2）
The variance analysis of quadratic regression equation model is carried out to the result of orthogonal test, is shown in Table 3.
Table 3 quadratic regression equation the results of analysis of variance
The quadratic term of model
pvalue is less than 0.01, shows that the impact of the synergy of three on trichloromethane removal effect is remarkable; And concussion is surged plate stroke
pvalue is greater than 0.05, shows that it is the most obvious on trichloromethane removal impact.In table 4, relation conefficient
r 2 =0.8777, lose and intend item=7.65 × 10
-3for significantly, matching degree of belief is high, and it is with a high credibility that institute carries out test.
Be optimized trichloromethane clearance by gained Parameters in Regression Model above, what draw trichloromethane separation system is reasonable in design, when Parameter Conditions quantity of reflux is 50 ~ 80m
3/ min, water level 50 ~ 80cm, concussion surge the cycle 10 ~ 20 beats/min, concussion surge plate stroke be 400 ~ 600mm, adopt continue jet mode.Trichloromethane eliminating equipment clearance is 99.84% with this understanding, shows that this mathematical model has good predictability to this experimental study, truly can reflect test-results.
Claims (7)
1. the tripping device of trichloromethane in a underground water, comprise concussion to surge pond (2), water inlet pipe (1) and rising pipe (11), concussion pond (2) of surging is cut off (9) by pond body and is divided into more than one concussion to surge path, each concussion is surged the arrangement of path parallel misalignment, be formed through S type passage end to end, the surge one end in path of each concussion is provided with concussion and surges device, concussion device of surging is slidably connected is formed by surge plate (4) and reciprocating lever (3) of concussion, it is characterized in that, earthquake surge pond (2) bottom be provided with jet pipe, described jet pipe is made up of jet main pipeline (5) and at least one jet small transfer line (6), jet small transfer line (6) is provided with at least one jet shower nozzle (7).
2. the tripping device of trichloromethane in a kind of underground water according to claim 1, is characterized in that, also comprise return line (10), and its one end is arranged on concussion and surges bottom, pond (2), and the other end is arranged on water inlet pipe (1) place.
3. the tripping device of trichloromethane in a kind of underground water according to claim 1, is characterized in that, earthquake surge pond (2) pool wall (13) on be provided with forms (12).
4. the tripping device of trichloromethane in a kind of underground water according to claim 1, is characterized in that, concussion device parallel misalignment of surging is arranged.
5. the tripping device of trichloromethane in a kind of underground water according to claim 1, is characterized in that, concussion plate (4) of surging does horizontal reciprocating movement under the effect of reciprocating lever (3), and its effective stroke is 100 ~ 2200 millimeters.
6. the tripping device of trichloromethane in a kind of underground water according to claim 1, it is characterized in that, jet shower nozzle (7) is the jet shower nozzle of porous air blowing aluminium alloy.
7. the tripping device of trichloromethane in a kind of underground water according to claim 5, is characterized in that, the surge effective stroke of plate (4) of concussion is 400 ~ 600 millimeters.
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| CN201520404649.XU CN204918062U (en) | 2015-06-12 | 2015-06-12 | Chloroform's separator in groundwater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104944514A (en) * | 2015-06-12 | 2015-09-30 | 徐州工程学院 | Separation device for trichloromethane in underground water and application of separation device |
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| CN104944514A (en) * | 2015-06-12 | 2015-09-30 | 徐州工程学院 | Separation device for trichloromethane in underground water and application of separation device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20180612 |