CN115283429A - Bioremediation technology test device and test system - Google Patents
Bioremediation technology test device and test system Download PDFInfo
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- CN115283429A CN115283429A CN202210705692.4A CN202210705692A CN115283429A CN 115283429 A CN115283429 A CN 115283429A CN 202210705692 A CN202210705692 A CN 202210705692A CN 115283429 A CN115283429 A CN 115283429A
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The embodiment of the application relates to contaminated soil repair technology field, in particular to bioremediation technology test device, includes: the test pool is provided with a test space, and the test space is used for storing polluted soil; an injection assembly; the gas injection assembly is communicated with the test space through the injection assembly and is used for injecting gas into the polluted soil in the test space through the injection assembly; the liquid injection assembly is communicated with the test space through the injection assembly and is used for injecting liquid into the polluted soil in the test space through the injection assembly; and a gas collection passage communicating the inside of the test space with the outside of the test space. The embodiment of the application also provides a biological repair technology test system. The bioremediation technology test device and the test system provided by the embodiment of the application can reduce the remediation cost, shorten the remediation period and improve the remediation effect in the process of remedying the polluted soil by utilizing the bioremediation technology.
Description
Technical Field
The embodiment of the application relates to the technical field of contaminated soil remediation, in particular to a bioremediation technology testing device and a testing system.
Background
Along with the development of science and technology, the living standard of people is also improved. Meanwhile, people pay more and more attention to the protection of the environment and even the remediation of the polluted environment. In remediating an already contaminated environment, remediation of contaminated soil is an important component. In the case of contaminated soil, the contaminants of the contaminated soil are mostly petroleum substances.
The process of polluting soil by petroleum substances mainly occurs in the links of petroleum exploitation, transportation, smelting, consumption and the like. The pollution is directly or indirectly caused when drilling, storing petroleum, breaking oil pipelines and well pipes, recharging oily sewage, piling oil sludge of oil production wells and filling oil to vehicles by a gas station. After the petroleum substance pollutes the soil, the emulsified or dissolved petroleum substance can migrate and diffuse to the deep part of the soil layer along with the water flow, thereby gradually increasing the volume of the polluted soil. If the pollution intensity of the petroleum substance is high and the content of the small molecular hydrocarbon in the petroleum substance is high, the groundwater aquifer is polluted. Therefore, it is important to restore soil contaminated with petroleum-based substances.
At present, the remediation technologies for remediating soil contaminated with petroleum substances are mainly divided into chemical remediation technologies, physical remediation technologies and biological remediation technologies. Compared with chemical remediation and physical remediation methods, the bioremediation method for petroleum substance contaminated soil has the advantages of high degradation efficiency, strong bioavailability, no secondary pollution, low cost, no damage to soil structure and the like, so that the bioremediation technology becomes a green sustainable remediation technology.
Bioremediation techniques are mainly applied to high permeability soils and are often used to treat soils contaminated with light petroleum hydrocarbons, medium petroleum hydrocarbons, vinyl chloride and its derivatives, chlorobenzene and its derivatives, and the like. Specifically, the bioremediation technology is to inject air and liquid into soil through a series of injection points, so that the growth of aerobic microorganisms is stimulated by controlling the oxygen content of the soil and the water content of the soil, and then pollutants in the soil are degraded by utilizing the respiration of the microorganisms.
In the polluted soil in different areas, because the environmental conditions of the polluted soil, the specific components of the pollutants in the polluted soil and the concentration of the pollutants in the polluted soil can be different, when the polluted soil is repaired by using a bioremediation technology, too much gas and liquid are often injected into the polluted soil to ensure the repairing effect. Therefore, in the process of repairing the polluted soil, the repairing cost is greatly increased, the repairing period is prolonged, the repairing effect is poor, and the problem of overhigh repairing cost is caused.
Disclosure of Invention
An object of the embodiment of the application is to provide a bioremediation technology test device and a test system, which can reduce the remediation cost, shorten the remediation period and improve the remediation effect in the process of remedying the polluted soil by using the bioremediation technology.
In order to solve the above problem, an embodiment of the present application provides a bioremediation technology testing apparatus, including: the test pool is provided with a test space, and the test space is used for storing polluted soil; an injection assembly; the gas injection assembly is communicated with the test space through the injection assembly and is used for injecting gas into the polluted soil in the test space through the injection assembly; the liquid injection assembly is communicated with the test space through the injection assembly and is used for injecting liquid into the polluted soil in the test space through the injection assembly; and a gas collection passage communicating the inside of the test space with the outside of the test space.
In addition, the embodiment of the present application further provides a bioremediation technology test system, including: in the plurality of test devices described above, the volume of the liquid injected into the test space by the liquid injection unit is different between two of the plurality of test devices.
The embodiment of the application provides a biological repair technology testing device and a biological repair technology testing system. The test device comprises: the test pool is provided with a test space, and the test space is used for storing polluted soil; an injection assembly; the gas injection assembly is communicated with the test space through the injection assembly and is used for injecting gas into the polluted soil in the test space through the injection assembly; the liquid injection assembly is communicated with the test space through the injection assembly and is used for injecting liquid into the polluted soil in the test space through the injection assembly; and a gas collection passage communicating the inside of the test space with the outside of the test space. So, before utilizing bioremediation technique to restore contaminated soil, but the part of sampling contaminated soil and the contaminated soil that will sample obtains puts into experimental space, then utilize gas injection subassembly to inject gas into contaminated soil, and utilize liquid injection subassembly to inject liquid into contaminated soil and make contaminated soil keep predetermined moisture content, thereby observe contaminated soil under the condition of this predetermined moisture content, the microbial content in the contaminated soil and the degradation rate of pollutant in the contaminated soil, and then analyze out when utilizing bioremediation technique to restore this contaminated soil, this contaminated soil's best moisture content. Therefore, in the subsequent process of repairing the polluted soil by using the bioremediation technology, the content of the liquid injected into the polluted soil can be controlled to control the polluted soil to have the optimal water content obtained in the analysis, so that excessive liquid does not need to be injected into the polluted soil, the volume of the liquid required when the polluted soil is repaired by using the bioremediation technology is reduced, and the repairing cost is further reduced. In addition, after the polluted soil is tested and analyzed by the biological repair technology testing device and the biological repair technology testing system, when the polluted soil is subsequently repaired by the biological repair technology, the liquid injected into the polluted soil can control the polluted soil to have the optimal water content obtained in the analysis, so that the repair effect of the polluted soil can reach a better state, the repair period is shortened, and the repair effect is improved.
Drawings
Fig. 1 is a schematic structural diagram of a bioremediation technology testing apparatus according to an embodiment of the present disclosure.
Detailed Description
As can be seen from the background art, in the contaminated soil in different areas, since the environmental conditions of the contaminated soil, the specific components of the contaminants in the contaminated soil, and the concentrations of the contaminants in the contaminated soil may be different, when the contaminated soil is repaired by using the bioremediation technology, excessive gas and liquid are often injected into the contaminated soil to ensure the repairing effect. Thus, in the process of repairing contaminated soil, the cost for repairing the contaminated soil is greatly increased, and the problem of excessive repairing cost is caused.
The inventor of the application finds that a test device and a test system can be designed, the specific process of repairing the polluted soil by using the bioremediation technology is simulated through the test device and the test system, and the optimal water content of the polluted soil is researched when the polluted soil is repaired by using the bioremediation technology. Therefore, in the subsequent process of repairing the polluted soil by using the bioremediation technology, the content of the liquid injected into the polluted soil can be controlled to control the polluted soil to have the optimal water content obtained in the analysis, so that excessive liquid does not need to be injected into the polluted soil, the volume of the liquid required when the polluted soil is repaired by using the bioremediation technology is reduced, and the repairing cost is further reduced.
Specifically, the test apparatus designed by the inventor of the present application includes: the test pool is provided with a test space, and the test space is used for storing polluted soil; an injection assembly; the gas injection assembly is communicated with the test space through the injection assembly and is used for injecting gas into the polluted soil in the test space through the injection assembly; the liquid injection assembly is communicated with the test space through the injection assembly and is used for injecting liquid into the polluted soil in the test space through the injection assembly; and a gas collection passage communicating the inside of the test space with the outside of the test space. So, before utilizing bioremediation technique to restore contaminated soil, but the part of sampling contaminated soil and the contaminated soil that will sample obtains puts into experimental space, then utilize gas injection subassembly to inject gas into contaminated soil, and utilize liquid injection subassembly to inject liquid into contaminated soil and make contaminated soil keep predetermined moisture content, thereby observe contaminated soil under the condition of this predetermined moisture content, the microbial content in the contaminated soil and the degradation rate of pollutant among the contaminated soil etc. and then analyze out when utilizing bioremediation technique to restore this contaminated soil, this contaminated soil's best moisture content.
In addition, after the polluted soil is tested and analyzed by the biological repair technology testing device and the biological repair technology testing system, when the polluted soil is subsequently repaired by the biological repair technology, the liquid injected into the polluted soil can control the polluted soil to have the optimal water content obtained in the analysis, so that the repair effect of the polluted soil can reach a better state, the repair period is shortened, and the repair effect is improved.
It should be noted that, when the bioremediation technology test device is used to simulate the remediation of the contaminated soil by the bioremediation technology, if the content of the microorganisms in the contaminated soil, the concentration of the pollutants in the contaminated soil, and the like are not changed, the contaminated soil is not suitable for the growth of the microorganisms, and therefore the bioremediation technology is not suitable for the remediation of the contaminated soil. Therefore, whether the polluted soil is suitable for being repaired by adopting the bioremediation technology can be obtained by utilizing the bioremediation technology test device, so that the resource waste caused by the fact that the polluted soil which is not suitable for the growth of microorganisms is repaired by adopting the bioremediation technology is avoided.
And when the biological repair technology test device is adopted to simulate the process of repairing the polluted soil by utilizing the biological repair technology, if the microorganisms enter the logarithmic growth phase, the microorganisms are proved to be adapted to the environmental conditions, namely the water content of the polluted soil is the optimal water content of the polluted soil when the soil is repaired by utilizing the biological repair technology, most of the microorganisms are propagated in a binary-division mode at the moment, and the microorganisms grow most rapidly.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following describes each embodiment of the present application in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in various embodiments of the present application in order to provide a better understanding of the present application. However, the technical means claimed in the present application can be realized by various changes and modifications of the following embodiments.
Referring to fig. 1, some embodiments of the present application provide a bioremediation technology test device comprising: the test pool 110 is provided with a test space 111, and the test space 111 is used for storing polluted soil; an injection assembly 120; a gas injection assembly 130 communicating with the test space 111 via the injection assembly 120 for injecting gas into the contaminated soil located in the test space 111 via the injection assembly 120; a liquid injection assembly 140 in communication with the test space 111 via the injection assembly 120 for injecting liquid into the contaminated soil located in the test space 111 via the injection assembly 120; and a gas collecting passage 150 communicating the inside of the test space 111 with the outside of the test space 111.
Specifically, the present application does not limit the specific shape of the test cell 110 as long as the test cell 110 has a test space 111 for storing contaminated soil. In one example, the test cell 110 is a trapezoid, the bottom surface of the test cell 110 is rectangular, the long side of the bottom surface is 0.65m (m: m), the short side of the bottom surface is 0.35m, the top surface of the test cell 110 is also rectangular, the long side of the top surface is 0.45m, the short side of the top surface is 0.15m, and the height of the test cell 110 is 0.25m.
The injection assembly 120 may be a device such as an injection tube, and the specific structure of the injection assembly 120 is not limited in this application as long as the gas injection assembly 130 can inject gas into the contaminated soil in the test space 111 through the injection assembly 120, and the liquid injection assembly 140 can inject liquid into the contaminated soil in the test space 111 through the injection assembly 120.
The present application does not limit the number of the injection assemblies 120, and in one example, the number of the injection assemblies 120 is one, and the gas injection assembly 130 and the liquid injection assembly 140 are communicated with the testing space 111 through the same injection assembly 120, so that the number of the injection assemblies 120 is reduced, thereby reducing the manufacturing cost of the testing device. In yet another example, the number of injection assemblies 120 is two, and the gas injection assembly 130 and the liquid injection assembly 140 communicate with the test space 111 through different injection assemblies 120.
In an exemplary embodiment, the number of the injection assemblies 120 is one, the injection assemblies 120 include a vertical injection tube 121 extending in a vertical direction, and a lateral injection tube 122 extending in a horizontal direction, wherein the vertical injection tube 121 is located in the middle of the test space 111, the lateral injection tube 122 is located at the bottom of the test space 111, and a plurality of output ports 123 are distributed on the vertical injection tube 121 and the lateral injection tube 122; a gas injection assembly 130 for injecting gas into the contaminated soil located in the test space 111 via a plurality of output ports 123; the liquid injection assembly 140 is used to inject liquid into the contaminated soil located in the test space 111 via the plurality of output ports 123. In this way, the gas and liquid injected into the test space 111 can be distributed more uniformly in the test space 111.
Further, in this embodiment, the bottom end of the vertical injection tube 121 communicates with the middle position of the lateral injection tube 122, so that the vertical injection tube 121 and the lateral injection tube 122 communicate with each other, the top end of the vertical injection tube 121 is connected with the bottom end of the extension tube 124, and the top end of the extension tube 124 extends out of the test space 111. As such, gas injection assembly 130 and liquid injection assembly 140 may facilitate injection of gas and liquid, respectively, into vertical injection tubes 121 and lateral injection tubes 122 via extension tubes 124.
Further, in this embodiment, the injection assembly 120 further includes a first delivery conduit 125, a second delivery conduit 126, and a sealing sleeve 127, the gas injection assembly 130 is in communication with the extension pipe 124 via the first delivery conduit 125, the liquid injection assembly 140 is in communication with the extension pipe 124 via the second delivery conduit 126, and the sealing sleeve 127 is used to seal the connections between the first delivery conduit 125 and the second delivery conduit 126 and the extension pipe 124 to prevent gas and liquid from leaking from the connections between the first delivery conduit 125 and the second delivery conduit 126 and the extension pipe 124.
In one example, the gas injection assembly 130 is an air pump, such that when gas is to be injected into the test space 111, the air pump is activated to inject air into the test space 111.
In some embodiments, the volume of gas injected into the test space 111 by the gas injection assembly 130 via the injection assembly 120 is adjustable. In this way, the volume of the gas injected into the test space 111 can be controlled, so that the influence of the injected gas with different volumes on the remediation effect can be researched when the polluted soil is remediated by using the bioremediation technology.
In one example, the volume of gas output by the gas injection assembly 130 can be controlled, i.e., the volume of gas output by the gas injection assembly 130 can be controlled. In yet another example, a first flow meter 131 and a first valve 132 are disposed on the first delivery conduit 125, the first flow meter 131 is used for measuring the volume of the gas flowing through the first delivery conduit 125, and the first valve 132 is used for shutting off the communication between the gas injection module 130 and the test space 111 via the first delivery conduit 125 after the measurement value of the first delivery conduit 125 reaches a predetermined value.
In some embodiments, the flow rate of gas injected into the test space 111 by the gas injection assembly 130 via the injection assembly 120 is adjustable. In this way, the flow of the gas injected into the test space 111 can be controlled, so that the influence of the gas injected at different flow rates on the remediation effect can be conveniently researched when the bioremediation technology is used for remedying the contaminated soil.
In one example, the flow rate of the gas output by the gas injection assembly 130 may be controlled, i.e., the flow rate of the gas output by the gas injection assembly 130 may be controlled. In yet another example, a first pressure gauge 133 and a second valve 134 are disposed on the first delivery conduit 125, the first pressure gauge 133 is used for measuring the flow rate of the gas flowing through the first delivery conduit 125, and the second valve 134 increases or decreases the flow rate of the gas injected into the test space 111 by the gas injection assembly 130 through the first delivery conduit 125. It should be noted that, in some embodiments, the first valve 132 and the second valve 134 may be the same valve.
In some embodiments, the volume of liquid injected into the test space 111 by the liquid injection assembly 140 via the injection assembly 120 is adjustable. In this way, the volume of the liquid injected into the test space 111 can be controlled, so that the influence of the injected liquid with different volumes on the remediation effect can be conveniently researched when the bioremediation technology is used for remedying the polluted soil.
In one example, the volume of liquid output by the liquid injection assembly 140 may be controlled, i.e., the volume of liquid output by the liquid injection assembly 140 may be controlled. In yet another example, a second flow meter 141 is disposed on the second delivery conduit 126 and a third valve 142 is disposed on the second delivery conduit 126, the second flow meter 141 being configured to meter the volume of the liquid flowing through the second delivery conduit 126, and the third valve 142 being configured to close the communication between the liquid injection assembly 140 and the test volume 111 via the second delivery conduit 126 after the metered value in the second delivery conduit 126 reaches a predetermined value.
In some embodiments, the flow rate of liquid injected into the test space 111 by the liquid injection assembly 140 via the injection assembly 120 is adjustable. In this way, the flow rate of the liquid injected into the test space 111 can be controlled, so that the influence of the injected liquid with different flow rates on the remediation effect can be conveniently researched when the polluted soil is remediated by using the bioremediation technology.
In one example, the flow rate of the liquid output by the liquid injection assembly 140 can be controlled, i.e., the flow rate of the liquid output by the liquid injection assembly 140 can be controlled. In yet another example, a second pressure gauge 143 is disposed on the second delivery conduit 126, the second pressure gauge 143 is used for measuring the flow rate of the liquid flowing through the second delivery conduit 126, and a fourth valve 144 is disposed on the second delivery conduit 126, the fourth valve 144 is used for increasing or decreasing the flow rate of the liquid injected into the test space 111 by the liquid injection assembly 140 through the second delivery conduit 126. It should be noted that, in some embodiments, the third valve 142 and the fourth valve 144 may be the same valve.
In some embodiments, the assay device further comprises: a first liquid storage tank 145 and a second liquid storage tank 146, the first liquid storage tank 145 being used for storing a first liquid to which a nutrient component is added, the second liquid storage tank 146 being used for storing a second liquid; a liquid injection assembly 140 is coupled to the first liquid storage tank 145 and the second liquid storage tank 146, the liquid injection assembly 140 being configured to inject liquid stored in either of the first liquid storage tank 145 and the second liquid storage tank 146 into contaminated soil located in the test space 111.
Specifically, the first liquid is water added with nutrient components, and the second liquid is water without nutrient components. The first liquid is used for providing nutrient components for the contaminated soil so as to better stimulate the growth of microorganisms, and in addition, when the first liquid is injected into the contaminated soil in the test space 111, the water content of the contaminated soil can also be improved. The second liquid is used for improving the water content of the polluted soil.
It should be noted that the present application does not limit the specific number of the liquid injection assemblies 140, and in one example, the number of the liquid injection assemblies 140 is two, and the two liquid injection assemblies 140 are respectively connected to the first liquid storage tank 145 and the second liquid storage tank 146. In another example, the number of the liquid injection assemblies 140 is one, the liquid injection assemblies 140 are connected to the first liquid storage tank 145 and the second liquid storage tank 146, and the liquid injection assemblies 140 can selectively inject the liquid stored in the first liquid storage tank 145 and/or the second liquid storage tank 146 into the contaminated soil in the test space 111.
The present application does not limit the specific types of the nutritional components. In one example, the soil-contaminating contaminant is a petroleum hydrocarbon, and the nutrient component may be potassium dihydrogen phosphate, ammonium nitrate, or the like.
In some embodiments, the liquid injection assembly 140 is a syringe pump, such that liquid can be injected into the contaminated soil in the test space 111 by activating the syringe pump.
In some embodiments, the test space 111 is divided into an unsaturated strip layer 112 and a saturated strip layer 113 located below the unsaturated strip layer 112; the unsaturated zone layer 112 is used for storing a first mixture which simulates unsaturated zone soil and is formed by mixing polluted soil and fillers; the saturated zone 113 is used to store a second mixture of the contaminated soil and water, which simulates saturated zone soil.
Therefore, the test device can be used for simulating the remediation of the polluted saturated zone soil by using the bioremediation technology, and the remediation of the polluted unsaturated zone soil and the saturated zone soil simultaneously. In particular, the present application does not limit the specific components of the filler, and in one example, the filler is straw.
In some embodiments, the assay device further comprises: and the sampling detection hole 114 is arranged on the test cell 110, communicates the inside of the test space 111 with the outside of the test space 111, and is used for allowing an operator to take out the polluted soil stored in the test space 111 from the outside of the test space 111.
Therefore, in the process of utilizing the testing device to simulate and utilize the bioremediation technology to repair the polluted soil, the polluted soil can be conveniently taken out partially at any time so as to analyze the polluted soil, and the repair condition of the polluted soil can be timely known.
Specifically, when the testing device is used to simulate the restoration of the contaminated soil by using the bioremediation technology, a part of the contaminated soil may be taken out through the sampling inspection hole 114 every other period to analyze the contaminated soil. More specifically, the analysis of the contaminated soil may specifically analyze the content of contaminants in the soil, the total number of bacteria in the soil, the ph of the soil, the temperature of the soil, the moisture content of the soil, and the like. The specific duration of the one period is not limited, and the one period may be three days, seven days, ten days, and the like.
When the measured moisture content of the soil is low, liquid may be injected into the contaminated soil through the liquid injection assembly 140. Wherein, the moisture content of the soil can be detected by an infrared moisture meter.
Further, in this embodiment, the test space 111 is divided into an unsaturated zone layer 112 and a saturated zone layer 113 below the unsaturated zone layer 112, in this case, the sampling holes 114 may include an upper sampling hole 115 and a lower sampling hole 116, the upper sampling hole 115 connects the unsaturated zone layer 112 with the outside of the test space 111, and the lower sampling hole 116 connects the saturated zone layer 113 with the outside of the test space 111.
Therefore, in the process of simulating the restoration of the polluted soil by using the biological restoration technology by using the test device, the first mixture can be sampled through the upper layer sampling detection hole 115 so as to obtain the restoration condition of the soil in the unsaturated zone; and the second mixture is sampled through the lower layer sampling detection hole 116 to know the remediation condition of the soil in the saturated zone.
Further, in this embodiment, the number of the upper sampling test holes 115 is two, and the two upper sampling test holes 115 are oppositely disposed and distributed on two sides of the test cell 110. This is so as to facilitate sampling of the first mixture at different locations.
Correspondingly, the number of the lower sampling test holes 116 may also be two, and the two lower sampling test holes 116 are oppositely disposed and distributed on two sides of the test cell 110. This is done to facilitate sampling of the second mixture at different locations. In other embodiments, the number of the upper layer sampling test holes 115 and the lower layer sampling test holes 116 may be two or more, which is not limited in the present application.
In some embodiments, the injection module 120 has an input port located outside the test space 111 and connected to the gas injection module 130, and an output port 123 extending into the test space 111 and located at the saturated belt layer 113. In some embodiments, the liquid injection assembly 140 is coupled to an input port.
The gas and liquid injected into the test space by the gas injection module 130 and the liquid injection module 140 are located at the saturated belt layer 113 through the output port 123. In one aspect, the injected gas and liquid are located in the saturated belt layer 113, so that the injected gas and liquid can transfer volatile pollutants in the saturated belt layer 113 to the unsaturated belt layer 112, and can carry away part of the volatile pollutants when the gas overflows from the unsaturated belt layer 112, thereby reducing the content of the pollutants in the polluted soil. On the other hand, by the injected gas and liquid being located in the saturated belt layer 113, the petroleum hydrocarbon decomposing enzyme released by the microorganisms and supplied by the electron and nitrogen phosphorus nutrition when the petroleum pollutants are decomposed by the injected gas and liquid is brought from the saturated belt layer 113 to the unsaturated belt layer 112 to form an effective migration reaction.
In some embodiments, the number of input ports is two, the two input ports being the port where the first delivery conduit 125 connects to the gas injection assembly 130 and the port where the second delivery conduit 126 connects to the liquid injection assembly 140.
In some embodiments, the gas collection channel 150 communicates to a top region of the test space 111. In this manner, the gas in the test space 111 can be easily discharged from the gas collecting channel 150.
In some embodiments, the assay device further comprises: a sealing sleeve 128, the sealing sleeve 128 sealingly connecting the gas collection channel 150 with the test space 111. In this way, the gas in the test space 111 is prevented from escaping from the connection between the gas collection channel 150 and the test cell 110.
In some embodiments, the assay device further comprises: the gas processing assembly 160, which is in communication with the test space 111 via the gas collection channel 150, is configured to process gas exhausted from the test space 111 via the gas collection channel 150.
When the gas injection assembly 130 and the liquid injection assembly 140 inject gas and liquid into the contaminated soil, gas escapes from the contaminated soil. When the gas overflows from the polluted soil, part of pollutants in the polluted soil can be carried away from the polluted soil jointly. When the contaminant-laden gas is discharged from the gas collecting channel 150 out of the test space 111, the contaminant-laden gas may be treated by the gas treatment assembly 160 to treat the contaminant entrained in the gas, thereby preventing the contaminant-laden gas from contaminating the environment.
Specifically, the gas processing module 160 includes a gas pump 161, a gas collection tank 162, and a gas processor 163, the gas pump 161 is configured to pump the gas in the test space 111 through the gas collection passage 150 and to deliver the gas into the gas collection tank 162, and the gas processor 163 is in communication with the gas collection tank 162 and is configured to process the contaminants contained in the gas collection tank 162 and to discharge the gas after the contaminants are processed. The gas processor 163 may have an adsorbing material therein for adsorbing contaminants, so that the contaminants entrained in the gas can be treated by adsorbing the contaminants through the adsorbing material.
In some embodiments, the assay device further comprises: and a liquid adjusting hole 117 provided at the bottom of the test cell 110 and communicating the inside of the test space 111 with the outside of the test space 111 for discharging the liquid in the test space 111.
In some embodiments, the assay device further comprises: a sealing member (not shown) provided at the liquid regulating hole 117 for blocking the liquid regulating hole 117 when there is no need to discharge the liquid through the liquid regulating hole 117.
Further, in this embodiment, the number of the liquid adjusting holes 117 is two, and two liquid adjusting holes 117 are oppositely disposed and distributed on two sides of the test cell 110. In this way, when the liquid is discharged through the liquid regulating hole 117, the liquid in the test cell 110 can be discharged more uniformly.
Some embodiments of the present application provide a bioremediation technology test system including a plurality of the bioremediation technology test devices provided in the above embodiments, wherein the liquid injection assembly 140 injects different volumes of liquid into the test space 111 through the injection assembly 120 in two of the plurality of test devices.
So, can look over simultaneously when utilizing the bioremediation technique to restore contaminated soil, contaminated soil is in under the circumstances of different moisture contents, contaminated soil's restoration condition to can analyze out more accurately and fast when utilizing the bioremediation technique to restore this contaminated soil, this contaminated soil's best moisture content.
Specifically, when the number of the test devices included in the bioremediation technology test system is two, two test devices of the plurality of test devices are the two test devices included in the bioremediation technology test system; when the number of the test devices included in the bioremediation technology test system is more than two, two of the plurality of test devices are two of the test devices included in the bioremediation technology test system.
In some embodiments, the ratio of carbon, nitrogen, and phosphorus in the first liquid stored in the first liquid storage tank 145 is different for two of the plurality of test units.
Therefore, when the polluted soil is repaired by the bioremediation technology, the influence of the nutrient components with different component ratios on the repair condition of the polluted soil can be simultaneously checked, so that the specific component ratio of the most suitable nutrient components of the polluted soil can be more accurately analyzed when the polluted soil is repaired by the bioremediation technology.
One manner of use of the bioremediation technology test system provided herein is shown below.
Specifically, according to a detailed survey report of the site environment of a certain chemical plant, soil polluted by petroleum and polycyclic aromatic hydrocarbon is selected as a bioremediation technology processing object, a soil sample with the depth of about 1.5m is collected near a polluted point by mechanical equipment such as an excavator on the site, the nutrient components added in the first liquid are potassium dihydrogen phosphate and ammonium nitrate, and the filler is straw. Wherein the petroleum hydrocarbon content of the contaminated soil without remediation was 14330mg/kg (mg/kg), the soil pH was 7.8, the total nitrogen was 340mg/kg, the total phosphorus was 143mg/kg, the soil water content was 6%, and the microbial biomass was 0.253mg/g (mg/g).
The bioremediation technique test system includes five bioremediation technique test devices, and the five test devices are divided into a first group, a second group, a third group, a fourth group, and a fifth group.
The test spaces 111 of the first group are only filled with contaminated soil without adding fillers, nutrients and conditioning moisture to simulate the field natural soil layer; the saturated belt layers 113 of the test spaces 111 of the second group to the fifth group are filled with a mixture of simulated saturated belt soil formed by mixing contaminated soil and water, and the unsaturated belt layers 112 of the test spaces 111 of the second group to the fifth group are filled with a mixture of simulated unsaturated belt soil formed by mixing contaminated soil and fillers. Wherein, the ratio of carbon, nitrogen and phosphorus added to the first liquid stored in the first liquid storage tank 145 of the second group is 100; the ratio of carbon, nitrogen and phosphorus added to the first liquid stored in the first liquid storage tank 145 of the third group is 100.5; the ratio of carbon, nitrogen and phosphorus added to the first liquid stored in the first liquid storage tank 145 of the fourth group is 100; the ratio of the carbon, nitrogen and phosphorus added to the first liquid stored in the fifth group of first liquid storage tanks 145 is 100.5.
And each group of devices collects a contaminated soil sample in the test space 111 on the 7 th day, the 14 th day, the 21 st day, the 28 th day, the 56 th day and the 84 th day, and detects the petroleum hydrocarbon content and the microbial activity in the contaminated soil sample. Wherein, the weight of the polluted soil sample collected every time can be set at 200 g.
The experimental results show that the first group is used as experimental control for comparison, and the total petroleum hydrocarbon attenuation rate is only 24% after the polluted soil which is not subjected to the bioremediation experiment is kept still for 84 days; and the total petroleum hydrocarbon attenuation rates of the second group and the fifth group are higher, and the total petroleum hydrocarbon attenuation rate of the second group is slightly higher than that of the fifth group. Specifically, after 84 days of experimental treatment reaction, the biomass of the microorganisms is 0.87mg/g, the total petroleum hydrocarbon attenuation rate is 77.3%, and the minimum petroleum hydrocarbon content in the soil is 6710mg/kg; the fifth group was treated for 84 days to obtain a microbial biomass of 0.77mg/g and a total petroleum hydrocarbon decay rate of 70.2%.
Therefore, the polluted soil can be repaired by adopting a bioremediation technology. If the polluted soil is repaired by adopting a bioremediation technology, the optimal water content of the unsaturated belt layer of the polluted soil is 18 percent; when the ratio of carbon, nitrogen and phosphorus added to the first liquid stored in the first liquid storage tank 145 is 100.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the present application, and that various changes in form and details may be made therein without departing from the spirit and scope of the present application in practice. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the application, and it is intended that the scope of the application be limited only by the claims appended hereto.
Claims (10)
1. A bioremediation technique testing device, comprising:
the test pool is provided with a test space, and the test space is used for storing polluted soil;
an injection assembly;
a gas injection assembly in communication with the test space via the injection assembly for injecting gas into contaminated soil located within the test space via the injection assembly;
a liquid injection assembly in communication with the test space via the injection assembly for injecting liquid into contaminated soil located in the test space via the injection assembly;
and a gas collection channel communicating the inside of the test space with the outside of the test space.
2. The testing device of claim 1, further comprising: the system comprises a first liquid storage tank and a second liquid storage tank, wherein the first liquid storage tank is used for storing a first liquid added with nutrient components, and the second liquid storage tank is used for storing a second liquid;
the liquid injection subassembly with first liquid storage jar and second liquid storage jar link to each other, the liquid injection subassembly is used for with the liquid injection that stores up in either one in first liquid storage jar and the second liquid storage jar is located in the contaminated soil in the experimental space.
3. Testing device according to claim 1,
the test space is divided into an unsaturated belt layer and a saturated belt layer positioned below the unsaturated belt layer;
the unsaturated zone layer is used for storing a first mixture which simulates unsaturated zone soil and is formed by mixing polluted soil and fillers;
the saturated zone is used for storing a second mixture which simulates saturated zone soil and is formed by mixing polluted soil and water.
4. The testing device of claim 3, further comprising:
the sampling detection hole is arranged on the test pool, communicates the interior of the test space with the exterior of the test space, and is used for an operator to take out the polluted soil stored in the test space from the exterior of the test space;
preferably, the sampling detection holes comprise an upper sampling detection hole and a lower sampling detection hole, the upper sampling detection hole communicates the unsaturated belt layer with the outside of the test space, and the lower sampling detection hole communicates the saturated belt layer with the outside of the test space.
5. Testing device according to claim 3,
the injection assembly is provided with an input port and an output port, the input port is positioned outside the test space and connected with the gas injection assembly, and the output port extends into the test space and is positioned on the saturated belt layer.
6. The testing device of claim 1, further comprising:
and the gas treatment assembly is communicated with the test space through the gas collecting channel and is used for treating the gas discharged from the test space through the gas collecting channel.
7. The testing device of claim 1, further comprising:
and the liquid adjusting hole is arranged at the bottom of the test pool, communicates the inside of the test space with the outside of the test space and is used for discharging liquid in the test space.
8. Testing device according to claim 1,
the injection assembly comprises a vertical injection pipe extending along the vertical direction and a transverse injection pipe extending along the horizontal direction, wherein the vertical injection pipe is positioned in the middle of the test space, the transverse injection pipe is positioned at the bottom of the test space, and a plurality of output ports are uniformly distributed on the vertical injection pipe and the transverse injection pipe;
the gas injection assembly is used for injecting gas into the polluted soil in the test space through a plurality of output ports;
the liquid injection assembly is used for injecting liquid into the polluted soil in the test space through the plurality of output ports.
9. A bioremediation technology testing system, comprising: a plurality of assay devices according to any of claims 1-8, wherein the volume of liquid injected into the assay space by the liquid injection assembly is different in two of the plurality of assay devices.
10. The testing system of claim 9, wherein the testing apparatus is the testing apparatus of claim 2, wherein in two of the testing apparatuses, the ratios of carbon, nitrogen and phosphorus of the nutrients added to the first liquid stored in the different first liquid storage tanks are different.
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