CN111018080A - Test device for treating petroleum hydrocarbon pollutants in underground water and application thereof - Google Patents
Test device for treating petroleum hydrocarbon pollutants in underground water and application thereof Download PDFInfo
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- CN111018080A CN111018080A CN201911240418.9A CN201911240418A CN111018080A CN 111018080 A CN111018080 A CN 111018080A CN 201911240418 A CN201911240418 A CN 201911240418A CN 111018080 A CN111018080 A CN 111018080A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C02F2101/32—Hydrocarbons, e.g. oil
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Abstract
The invention relates to a test device for treating petroleum hydrocarbon pollutants in underground water and application thereof, belonging to the technical field of underground water pollutant treatment. The test device comprises: the device comprises a sewage container, a submersible pump, an oxidant container, an oxidant injection pump, an overflow groove, a reaction column and a filtering inner core, wherein the head end of the reaction column is provided with a sewage injection port; the tail end of the reaction column is provided with a liquid outlet; seepage media are filled in the reaction column; an oxidant injection pipe, a sampling port and a filtering inner core are sequentially arranged from the sewage injection port to the liquid discharge port; the oxidant container is connected with the inside of the reaction column through an oxidant injection pump and an oxidant injection pipe; the sewage container is connected with the sewage injection port through a submersible pump; the overflow launder is connected with the liquid outlet. The invention also discloses a method for treating petroleum hydrocarbon pollutants in the underground water. The testing device can simulate the dispersion condition of a single release point source in fluid, and provides a basis for the design of a later-stage permeable reactive barrier.
Description
Technical Field
The invention belongs to the technical field of underground water pollutant treatment, and particularly relates to a test device for treating petroleum hydrocarbon pollutants in underground water and application thereof.
Background
The Permeable Reactive Barrier (PRB) is a treatment system which is arranged in an underground water environment with small aquifer thickness and shallow burial depth and can be used for treating petroleum hydrocarbon pollutants in the underground water. The permeable reactive barrier is generally constructed in a pollutant transport dispersion area in an underground water seepage field, and is filled with a particle medium with the functions of adsorption, acid-base neutralization or ion exchange and the like according to the chemical components and control requirements of pollutants so as to absorb or remove general acid-base, heavy metal and trace organic pollutants, and can be used for partitioning the polluted area of the underground water environment, purifying the pollutants transported along with underground water or isolating a pollutant release source.
One treatment mode of the permeable reactive barrier is to inject an oxidant into an aquifer containing pollutants, and the injected oxidant can disperse along with the seepage transport of underground water, so that an oxidation zone is formed in an underground water flow field in a pollution dispersion area, the pollutants which are transported along with the seepage transport of the underground water are directly removed by reaction, and meanwhile, the transport path of the pollutants is blocked.
At present, the permeable reactive barrier cannot reasonably simulate the dispersion condition of an oxidant in water. And the simulation of the dispersion condition of the oxidant in water has important guiding significance on the design of the permeable reactive barrier. In view of this, it is necessary to provide a testing device for treating petroleum hydrocarbon pollutants in groundwater.
Disclosure of Invention
The invention provides a test device for treating petroleum hydrocarbon pollutants in underground water to solve the technical problems that the dispersion condition of an oxidant in water cannot be intuitively and accurately simulated at present.
The technical scheme for solving the technical problems is as follows: a test device for treating petroleum hydrocarbon pollutants in underground water comprises: a sewage container, a submersible pump, an oxidant container, an oxidant injection pump, an overflow groove, a reaction column and a filtering inner core, wherein,
the head end of the reaction column is provided with a sewage injection port; the tail end of the reaction column is provided with a liquid outlet; the interior of the reaction column is filled with seepage medium; an oxidant injection pipe, at least two sampling ports and a filtering inner core are sequentially arranged from the sewage injection port to the liquid discharge port;
the liquid outlet end of the oxidant container is connected with the liquid inlet end of the oxidant injection pump through a pipeline; the liquid outlet end of the oxidant injection pump is connected with the interior of the reaction column through the oxidant injection pipe;
the submersible pump is arranged in the sewage container, and the sewage container is connected with the sewage injection port through a pipeline;
the overflow groove is connected with the liquid outlet through a pipeline;
and 2-3 stages of filter belts are arranged in the filter inner core.
The invention has the beneficial effects that:
(1) the test device for treating petroleum hydrocarbon pollutants in underground water treats pollutants flowing in the reaction column by injecting the oxidant through the single release point source without constructing a whole permeable reaction wall, saves the occupied space of the device and reduces the manufacturing cost;
(2) the test device for treating petroleum hydrocarbon pollutants in underground water of the invention provides important basis for the arrangement quantity and the arrangement mode of the single release point sources on the later-stage permeation reaction wall through the simulation of the single release point sources;
(3) the reaction column is provided with a plurality of sampling ports, so that a user can conveniently sample and detect the petroleum hydrocarbon polluted water sample after oxidation treatment, and the operation is simple;
(4) the filter inner core is convenient to replace and install, the filter belt can effectively remove solid particle impurities in water, and the treatment efficiency of petroleum hydrocarbon polluted water samples is improved.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the filter belt is of a mesh type, and the mesh number is 80-200 meshes.
The beneficial effect of adopting the further scheme is that: the oil hydrocarbon polluted water sample after oxidation can be subjected to multistage filtration through the filter screens with different meshes, and the solid particle impurities in the water sample can be thoroughly removed.
Furthermore, the oxidant injection pipe is an L-shaped structure formed by connecting a horizontal pipe and a vertical pipe, the horizontal pipe is positioned on the central axis of the reaction column, the liquid outlet end of the horizontal pipe is consistent with the flowing direction of the seepage medium, and the liquid inlet end of the vertical pipe is connected with the liquid outlet end of the oxidant injection pump.
The beneficial effect of adopting the further scheme is that: the liquid outlet end of the oxidant injection pipe is used as a release point source, the oxidant injected by the release point source can generate radial dispersion and longitudinal dispersion along with the liquid transportation in the reaction column, and an axisymmetric transportation dispersion area is formed at the downstream of the oxidant injection pipe, which is consistent with the dispersion condition of a single release point source on an actual permeable reaction wall, thereby helping a user simulate the dispersion change of the oxidant in an underground water flow field.
Further, the distance between the liquid outlet end of the vertical pipe and the sewage injection port along the flowing direction of the seepage medium is 0.25-0.35 m.
The beneficial effect of adopting the further scheme is that: a0.25-0.35 m rectification section is arranged between the liquid outlet end of the vertical pipe and the sewage injection port, which is beneficial to uniformizing the seepage flow velocity on the overflowing section of the sewage injection port.
Further, the inner diameter of the reaction column is 0.08-0.15m, the length of the reaction column is 10.5-11.6m, and the sampling port is arranged on the outer wall of the reaction column.
The beneficial effect of adopting the further scheme is that: the reasonable inner diameter can provide enough space for radial dispersion of the oxidant in the reaction column to help a user to know the final dispersion condition of the oxidant; reasonable length can help the user arrange suitable sample connection quantity to improve the accuracy of experiment.
Further, the reaction column is prepared from at least one of PP material, PC material, PE material and PVC material.
The beneficial effect of adopting the further scheme is that: the PP material, the PC material, the PE material, the PVC material and other materials have good tightness and good wear resistance, are simple and easy to obtain, and contribute to reducing the manufacturing cost.
Furthermore, the seepage medium is sand-included gravel, wherein the particle size of the gravel is 2mm-4mm, the particle size of the sand is 0.25mm-0.5mm, the grading ratio is 9:5, the seepage coefficient K is 76.9m/d, and the Pe is 2.68 multiplied by 102.
The beneficial effect of adopting the further scheme is that: the diffusion environment of the oxidant in the liquid can be simulated really by arranging the seepage medium, and the experimental accuracy is improved.
Furthermore, a valve and a flowmeter are arranged on a pipeline between the submersible pump and the sewage injection port.
The beneficial effect of adopting the further scheme is that: the sewage can be controlled to enter the reaction column by arranging the valve, the structure is simple, and the operation is convenient; the change of the sewage injection can be monitored through the flow meter, and the control of the sewage injection is enhanced.
Furthermore, a plurality of brackets for fixedly mounting the reaction column are arranged below the reaction column.
The beneficial effect of adopting the further scheme is that: can provide the support for the reaction column through the support, play the effect of protection reaction column.
In addition, the invention also provides a method for treating the petroleum hydrocarbon pollutants in the underground water by using the test device for treating the petroleum hydrocarbon pollutants in the underground water, which can solve the technical problem that the adjustment of test parameters such as a petroleum hydrocarbon polluted water sample, an oxidant, an injection amount and the like in the current simulation test of the permeable reactive barrier is inconvenient.
The technical scheme for solving the technical problems is as follows: a method for treating petroleum hydrocarbon pollutants in underground water by using the test device for treating petroleum hydrocarbon pollutants in underground water comprises the following steps:
s1, taking a water sample of petroleum hydrocarbon pollutants in treated underground water, and injecting the water sample into a sewage container for later use; taking an oxidant, and injecting the oxidant into an oxidant container for later use;
s2, filling the seepage medium 2 into the reaction column, starting the submersible pump, and injecting the petroleum hydrocarbon polluted water sample in the sewage container in the step S1 into the reaction column; then starting an oxidant injection pump, injecting the oxidant in the oxidant container in the step S1 into the reaction column, enabling the petroleum hydrocarbon polluted water sample to be in contact oxidation with the oxidant, discharging the oxidized petroleum hydrocarbon polluted water sample out of the reaction column through a liquid discharge port after the oxidized petroleum hydrocarbon polluted water sample passes through a filtering inner core, and sampling and storing through a sampling port every 1-5 hours;
s3, after the petroleum hydrocarbon polluted water sample is in contact reaction with the oxidant for 24-26 hours in the step S2, detecting and analyzing the sample obtained in the step S2, and finishing the treatment.
The beneficial effects of the adoption are: according to the method, the influence factors of petroleum hydrocarbon pollutant removal can be fully known by researching the removal effect of different petroleum hydrocarbon pollutant water samples, different oxidants, different oxidant injection amounts, different seepage media and simulation of the oxidation time of the petroleum hydrocarbon pollutant water samples in the test device on the petroleum hydrocarbon compounds, the removal rate of the petroleum hydrocarbon pollutants is obtained through calculation, and finally the characteristics of the permeable reactive barrier in the actual environment are obtained according to the calculation. The invention provides reliable theoretical basis and practical guidance for the oxidant and the oxidant injection amount required by the underground water energy in different areas to achieve the optimal removal effect of the petroleum hydrocarbon pollutants, has low cost and simple operation, is combined with the practice, completes the acquisition of related data and obtains accurate related test data.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in step S2, the injection quantity of the petroleum hydrocarbon polluted water sample and the injection mass ratio of the oxidant are 1 (2-5); the oxidant is sodium ferrate oxidant and/or potassium ferrate oxidant. Furthermore, the injection quantity ratio of the petroleum hydrocarbon polluted water sample to the oxidant is 1 (3-4).
The beneficial effect of adopting the further scheme is that: when the injection amount of the oxidant is 3-4 times of that of the petroleum hydrocarbon polluted water sample, the oxidation rate of the petroleum hydrocarbon compound is high, and the reaction process is stable.
Further, in step S2, the injection rate of the petroleum hydrocarbon polluted water sample into the reaction column is 0.003L/h-0.018L/h, and the injection rate of the oxidizing agent into the reaction column is 0.009L/h-0.048L/h.
The beneficial effect of adopting the further scheme is that: the injection rate can be controlled to effectively control the petroleum hydrocarbon polluted water sample and the injection amount of the oxidant, the influence of the oxidant on the removal effect of the petroleum hydrocarbon compounds can be researched, and the operation is simple and convenient.
Drawings
FIG. 1 is a schematic structural diagram of a test apparatus for treating petroleum hydrocarbon pollutants in groundwater according to the present invention;
FIG. 2 is a schematic diagram of the structure of the filter core of the testing device for treating petroleum hydrocarbon pollutants in underground water according to the invention;
in the drawings, the components represented by the respective reference numerals are listed below:
2. the device comprises a sewage container, 4, a submersible pump, 6, an oxidant container, 8, an oxidant injection pump, 10, an overflow groove, 12, an seepage medium, 14, a reaction column, 16, a sewage injection port, 18, a liquid discharge port, 20, an oxidant injection pipe, 20a, a transverse pipe, 20b, a vertical pipe, 22, a sampling port, 36, a valve, 42, a flowmeter, 48, a bracket, 66, a filtering inner core, 68 and a filter belt.
FIG. 3 is a schematic diagram of the diffusion principle of continuous constant release and transport of an oxidant in a reaction column, wherein the X axis is a longitudinal diffusion direction, the Y axis is a radial diffusion direction, a point O is a release point source of the oxidant, and u is an upstream area of the point O;
FIG. 4 is a graph showing the concentration distribution of petroleum hydrocarbon in each sampling port monitored in the third to fifth embodiments, wherein ① is the concentration measurement value of 5.52mg/L concentration petroleum hydrocarbon-contaminated water sample, ② is the concentration measurement value of 2.12mg/L concentration petroleum hydrocarbon-contaminated water sample, and ③ is the concentration measurement value of 1.18mg/L concentration petroleum hydrocarbon-contaminated water sample.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The invention is further illustrated with reference to the accompanying figures 1-2:
implementation mode one
The present embodiment provides a test apparatus for treating petroleum hydrocarbon pollutants in groundwater, as shown in fig. 1 and 2, including: the device comprises a sewage container 2, a submersible pump 4, an oxidant container 6, an oxidant injection pump 8, an overflow groove 10, a reaction column 14 and a filtering inner core 66, wherein a sewage injection port 16 is arranged at the head end of the reaction column 14 as shown in the combined drawings of fig. 1 and 2; a liquid outlet 18 is arranged at the tail end of the reaction column 14; the interior of the reaction column 14 is filled with a seepage medium 12; an oxidant injection pipe 20, at least two sampling ports 22 and a filtering inner core 66 are sequentially arranged from the sewage injection port 16 to the liquid discharge port 18; as shown in fig. 1 and fig. 2, the liquid outlet end of the oxidant container 6 is connected to the liquid inlet end of the oxidant injection pump 8 through a pipeline; the liquid outlet end of the oxidant injection pump 8 is connected with the inside of the reaction column 14 through the oxidant injection pipe 20; as shown in fig. 1 and 2, the submersible pump 4 is disposed in the sewage container 2, and the sewage container 2 is connected to the sewage injection port 16 through a pipeline; as shown in fig. 1 and 2, the overflow trough 10 is connected with the liquid outlet 18 through a pipeline; as shown in fig. 1 and 2, the filtering inner core 66 is internally provided with a 2-3 stage filtering belt 68
The technical problem that the dispersion condition of the oxidant in water cannot be reasonably simulated at present can be solved by the implementation mode.
As shown in fig. 3, in this embodiment, the oxidizing agent is injected through a single release point source to treat the pollutants flowing in the reaction column 14, and the whole permeable reaction wall does not need to be constructed, so that the occupied space of the device is saved, and the manufacturing cost is reduced; through the simulation of the single release point sources, important basis is provided for the arrangement quantity and the arrangement mode of the single release point sources on the later-stage permeation reaction wall; the reaction column is provided with at least two sampling ports, so that a user can conveniently sample and detect the petroleum hydrocarbon polluted water sample treated by the oxidant, and the operation is simple; the filter inner core 66 is convenient to replace and install, and the filter belt 68 can effectively remove solid particle impurities in water, so that the treatment efficiency of the petroleum hydrocarbon polluted water sample is improved.
In order to improve the filtering effect, the filtering belt 68 is of a mesh type, and the mesh number is 80-200.
Therefore, the oxidized petroleum hydrocarbon polluted water sample can be subjected to multistage filtration through the filter screens with different meshes, and the method is favorable for thoroughly removing solid particle impurities in the water sample.
In order to improve the effect of oxidant treatment, the oxidant injection pipe 20 is an L-shaped structure formed by connecting a horizontal pipe 20a and a vertical pipe 20b, the horizontal pipe 20a is located on the central axis of the reaction column 14, the liquid outlet end of the horizontal pipe 20a is in accordance with the flowing direction of the seepage medium 12, the liquid inlet end of the vertical pipe 20b is connected with the liquid outlet end of the oxidant injection pump 8, and the distance between the liquid outlet end of the vertical pipe 20b and the sewage injection port 16 along the flowing direction of the seepage medium 12 is 0.25-0.35 m.
Thus, the liquid outlet end of the transverse pipe 20a of the oxidant injection pipe is used as a release point source, the oxidant injected by the release point source can generate radial dispersion and longitudinal dispersion along with the liquid transportation of seepage media in the reaction column, and an axisymmetric transportation dispersion area is formed at the liquid outlet end of the oxidant injection pipe, which is consistent with the dispersion condition of a single release point source on an actual permeable reaction wall, so that a user is helped to simulate the dispersion change of the oxidant in an underground water flow field; meanwhile, a rectification section of 0.25-0.35m is arranged between the liquid outlet end of the vertical pipe 20b and the sewage injection port, which is helpful for homogenizing the seepage flow velocity on the overflowing section of the sewage injection port.
In order to improve the treatment effect of the oxidant, the distance between the liquid outlet end of the oxidant injection pipe 20 and the sewage injection port 16 along the liquid flowing direction is 0.25-0.35 m.
Thus, a 0.25-0.35m rectifying section is arranged between the liquid outlet end of the oxidant injection pipe 20 and the sewage injection port 16, which is helpful for homogenizing the seepage flow velocity on the flow cross section of the sewage injection port 16.
In order to improve the accuracy of the experiment, the inner diameter of the reaction column 14 is 0.08-0.15m, the length of the reaction column 14 is 10.5-11.6m, and the sampling port is arranged on the outer wall of the reaction column.
In this way, a reasonable inner diameter can provide enough space for the radial dispersion of the oxidant in the reaction column 14 to help the user understand the final dispersion of the oxidant; a reasonable length can help the user to place the proper number of sampling ports 22, thereby increasing the accuracy of the experiment.
Wherein, the reaction column 14 is prepared by at least one of PP material, PC material, PE material and PVC material. The PP material, the PC material, the PE material, the PVC material and other materials have good tightness and good wear resistance, are simple and easy to obtain, and contribute to reducing the manufacturing cost.
Wherein the seepage medium 12 is sand, gravel or sand-gravel. The diffusion environment of the oxidant in the liquid can be simulated really by arranging the seepage medium 12, and the experimental accuracy is improved. Specifically, the seepage medium 12 is sand-included gravel, wherein the particle size of the gravel is 2mm-4mm, the particle size of the sand is 0.25mm-0.5mm, the grading ratio is 9:5, the seepage coefficient K is 76.9m/d, and Pe is 2.68 multiplied by 102。
In addition, for convenience of detection and control, the present embodiment may be modified as follows:
a valve 36 and a flow meter 42 are also provided on the pipeline between the submersible pump 4 and the sewage injection port 16.
Thus, the flow meter 42 can monitor the change of the sewage injection, and enhance the control of the sewage injection.
The oxidant injection pump 8 is a metering pump. In this way, the amount of oxidant injected can be controlled by the metering pump, enhancing control over oxidant injection.
In order to support the reaction column 14, a plurality of brackets 48 for fixedly mounting the reaction column 14 are further provided under the reaction column 14.
Thus, the support 48 can provide support for the reaction column 14, so that the reaction column 14 is at a certain distance from the ground, and the reaction column 14 is protected.
In order to more fully illustrate the present invention, we also provide a preferred embodiment below:
second embodiment
The embodiment provides a test device for treating petroleum hydrocarbon pollutants in underground water, which is shown in a combined figure 1-2 and comprises: the device comprises a sewage container 2, a submersible pump 4, an oxidant container 6, an oxidant injection pump 8, an overflow groove 10, a reaction column 14, a filtering inner core 66, a valve 36, a flowmeter 42 and a bracket 48, wherein as shown in figure 1, a sewage injection port 16 is arranged at the head end of the reaction column 14; a liquid outlet 18 is arranged at the tail end of the reaction column 14; the interior of the reaction column 14 is filled with a seepage medium 12; an oxidant injection pipe 20, at least two sampling ports 22 and a filtering inner core 66 are sequentially arranged from the sewage injection port 16 to the liquid discharge port 18, wherein the inner diameter of the reaction column 14 is 0.11m, the length of the reaction column 14 is 11.1m, the reaction column is horizontally arranged, and one sampling port is arranged at an interval of 2.1 m; as shown in fig. 1-2, the oxidant injection pipe 20 is an L-shaped structure formed by connecting a horizontal pipe 20a and a vertical pipe 20b, the horizontal pipe 20a is located on the central axis of the reaction column 14, the outlet end of the horizontal pipe 20a is in the same direction as the flow direction of the effusion medium 12, the inlet end of the vertical pipe 20b is connected with the outlet end of the oxidant injection pump 8, and the distance between the outlet end of the vertical pipe 20b and the sewage injection port 16 along the flow direction of the effusion medium 12 is 0.3 m; as shown in fig. 1-2, the liquid outlet end of the oxidant container 6 is connected to the liquid inlet end of the oxidant injection pump 8 through a pipeline; the liquid outlet end of the oxidant injection pump 8 is connected with the inside of the reaction column 14 through the oxidant injection pipe 20; as shown in fig. 1-2, the submersible pump 4 is disposed in the sewage container 2, and the sewage container 2 is connected to the sewage injection port 16 through a pipeline; as shown in fig. 1-2, the overflow trough 10 is connected to the drain 18 via a pipe; as shown in fig. 1-2, a valve 36 and a flow meter 42 are further provided on the pipeline between the submersible pump 4 and the sewage injection port 16; as shown in fig. 1-2, a plurality of brackets 48 for fixedly mounting the reaction column 14 are further provided below the reaction column 14; as shown in fig. 1-2, a 2-stage filter belt 68 is disposed inside the filter core 66, and the filter belt 68 is a filter mesh type filter belt 68, and the mesh number of the filter mesh is 80 mesh and 150 mesh, respectively.
In order to verify the treatment effect of the test apparatus for treating petroleum hydrocarbon pollutants in groundwater, 3 sets of tests for treating petroleum hydrocarbon pollutants were performed using the test apparatus for treating petroleum hydrocarbon pollutants in groundwater according to embodiment 2, and the water samples of petroleum hydrocarbon pollutants in groundwater treated in the following embodiments were all prepared by uniformly mixing commercially available No. 0 diesel oil and water.
Third embodiment
A method of treating petroleum hydrocarbon contaminants in groundwater using the test rig of embodiment 2, the method comprising the steps of:
s1, injecting a petroleum hydrocarbon pollutant water sample in underground water treated at a concentration of 5.52mg/L into a sewage container for later use, and injecting a sodium ferrate oxidant at a concentration of 251.96mg/L into an oxidant container for later use;
s2, filling the seepage medium 12 into the reaction column 14, starting the submersible pump 4, and injecting the petroleum hydrocarbon pollution water sample in the sewage container 2 in the step S1 into the reaction column 14; starting an oxidant injection pump 8, injecting the oxidant in the oxidant container 6 in the step S1 into the reaction column 14, enabling the petroleum hydrocarbon polluted water sample to be in contact with the oxidant for oxidation, and discharging the oxidized petroleum hydrocarbon polluted water sample out of the reaction column 14 through a liquid discharge port after passing through a filter inner core 66, wherein the injection amount of the petroleum hydrocarbon polluted water sample and the injection amount of the potassium ferrate oxidant are in a ratio of 1:4, the injection rate of the petroleum hydrocarbon polluted water sample into the reaction column is 0.018L/h, the injection rate of the potassium ferrate oxidant into the reaction column is 0.048L/h, and sampling and storing are carried out through a sampling port (22) every 5 h;
s3, after the petroleum hydrocarbon polluted water sample in the step S2 is in contact reaction with the oxidant for 26 hours, detecting and analyzing the sample obtained in the step S2, and finishing the treatment.
Embodiment IV
A method of treating petroleum hydrocarbon contaminants in groundwater using the test rig of embodiment 2, the method comprising the steps of:
s1, injecting a petroleum hydrocarbon pollutant water sample in underground water treated at the concentration of 2.12mg/L into a sewage container for later use, and injecting a sodium ferrate oxidant at the concentration of 100.78mg/L into an oxidant container for later use;
s2, filling the seepage medium 12 into the reaction column 14, starting the submersible pump 4, and injecting the petroleum hydrocarbon pollution water sample in the sewage container 2 in the step S1 into the reaction column 14; starting an oxidant injection pump 8, injecting the oxidant in the oxidant container 6 in the step S1 into the reaction column 14, enabling the petroleum hydrocarbon polluted water sample to be in contact with the oxidant for oxidation, then discharging the oxidized petroleum hydrocarbon polluted water sample out of the reaction column 14 through a liquid discharge port after passing through a filter inner core 66, wherein the injection amount of the petroleum hydrocarbon polluted water sample and the injection amount of the potassium ferrate oxidant are in a ratio of 1:4, the injection rate of the petroleum hydrocarbon polluted water sample into the reaction column is 0.006L/h, the injection rate of the potassium ferrate oxidant into the reaction column is 0.009L/h-0.019L/h, and sampling and storing are carried out through a sampling port (22) every 2 h;
and S3, after the petroleum hydrocarbon polluted water sample in the step S2 is in contact reaction with the oxidant for 26 hours, detecting and analyzing the sample obtained in the step S2.
Fifth embodiment
A method of treating petroleum hydrocarbon contaminants in groundwater using the test rig of embodiment 2, the method comprising the steps of:
s1, injecting a petroleum hydrocarbon pollutant water sample in underground water treated at the concentration of 1.18mg/L into a sewage container for later use, and injecting a potassium ferrate oxidant at the concentration of 50.39mg/L into an oxidant container for later use;
s2, filling the seepage medium 12 into the reaction column 14, starting the submersible pump 4, and injecting the petroleum hydrocarbon pollution water sample in the sewage container 2 in the step S1 into the reaction column 14; then starting an oxidant injection pump 8, injecting the oxidant in the oxidant container 6 in the step S1 into the reaction column 14, enabling the petroleum hydrocarbon polluted water sample to be in contact with the oxidant for oxidation, then discharging the oxidized petroleum hydrocarbon polluted water sample out of the reaction column 14 through a liquid discharge port after passing through a filter inner core 66, wherein the injection amount of the petroleum hydrocarbon polluted water sample and the injection amount of the sodium ferrate oxidant are in a ratio of 1:4, the injection rate of the petroleum hydrocarbon polluted water sample into the reaction column is 0.003L/h, the injection rate of the sodium ferrate oxidant into the reaction column is 0.009L/h, and sampling and storing are carried out through a sampling port (22) every 3 h;
and S3, after the petroleum hydrocarbon polluted water sample in the step S2 is in contact reaction with the oxidant for 26 hours, detecting and analyzing the sample obtained in the step S2.
Through testing, the petroleum hydrocarbon concentration distribution of each sampling port monitored in the third to fifth embodiments is shown in fig. 4; the total oxidation rate of the petroleum hydrocarbon contaminants in each of the test water samples obtained in the third to fifth embodiments is shown in table 1.
TABLE 1 Total oxidation rate of hydrocarbons in the treated Water samples
| Treating water samples | Third embodiment | Embodiment IV | Fifth embodiment |
| Total oxidation rate | 85.14％ | 84.06％ | 84.75％ |
As can be seen from fig. 4, the concentration of the petroleum hydrocarbon contaminants always decreased in the range of the reaction column 14 in the third to fifth embodiments; as can be seen from table 1, the total oxidation rate of the present invention is 84.06% to 85.14%, which indicates that the third to fifth embodiments can effectively remove the petroleum hydrocarbon pollutants in the groundwater, and the effect is stable.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A test device for treating petroleum hydrocarbon pollutants in underground water is characterized by comprising: a sewage container (2), a submersible pump (4), an oxidant container (6), an oxidant injection pump (8), an overflow groove (10), a reaction column (14) and a filtering inner core (66), wherein,
the head end of the reaction column (14) is provided with a sewage injection port (16); a liquid outlet (18) is arranged at the tail end of the reaction column (14); the inside of the reaction column (14) is filled with a seepage medium (12); an oxidant injection pipe (20), at least two sampling ports (22) and a filtering inner core (66) are sequentially arranged from the sewage injection port (16) to the liquid discharge port (18);
the liquid outlet end of the oxidant container (6) is connected with the liquid inlet end of the oxidant injection pump (8) through a pipeline; the liquid outlet end of the oxidant injection pump (8) is connected with the interior of the reaction column (14) through the oxidant injection pipe (20);
the submersible pump (4) is arranged in the sewage container (2), and the sewage container (2) is connected with the sewage injection port (16) through a pipeline;
the overflow trough (10) is connected with the liquid outlet (18) through a pipeline;
the filtering inner core (66) is internally provided with a 2-3 stage filtering belt (68).
2. The testing apparatus for treating petroleum hydrocarbon pollutants in groundwater according to claim 1, wherein the filter belt (68) is mesh-type with a mesh size of 80-200 mesh.
3. The test device for treating petroleum hydrocarbon pollutants in groundwater according to claim 1, wherein the oxidant injection pipe (20) is an L-shaped structure formed by connecting a horizontal pipe (20a) and a vertical pipe (20b), the horizontal pipe (20a) is positioned on a central axis of the reaction column (14), a liquid outlet end of the horizontal pipe (20a) is consistent with a flowing direction of the seepage medium (12), and a liquid inlet end of the vertical pipe (20b) is connected with a liquid outlet end of the oxidant injection pump (8).
4. A test unit for treating petroleum hydrocarbon pollutants in groundwater according to claim 3, wherein the distance between the outlet end of the standpipe (20b) and the sewage injection inlet (16) in the flow direction of the seepage medium (12) is 0.25-0.35 m.
5. The test device for treating petroleum hydrocarbon pollutants in underground water as claimed in claim 1, wherein the reaction column (14) has an inner diameter of 0.08-0.15m and a length of 10.5-11.6m, and the sampling port (22) is arranged on the outer wall of the reaction column (14).
6. A test unit for treating petroleum hydrocarbon pollutants in groundwater according to any of claims 1 to 5, wherein a valve (36) and a flow meter (42) are further provided on the pipeline between the submersible pump (4) and the sewage injection inlet (16).
7. A test device for treating petroleum hydrocarbon pollutants in groundwater according to any one of claims 1 to 5, wherein a plurality of brackets (48) for fixedly mounting the reaction column (14) are further provided below the reaction column (14).
8. A method for treating petroleum hydrocarbon pollutants in underground water by using the test device for treating petroleum hydrocarbon pollutants in underground water as claimed in any one of claims 1 to 5, which comprises the following steps:
s1, taking a water sample of petroleum hydrocarbon pollutants in underground water to be treated, and injecting the water sample into a sewage container (2) for later use; taking an oxidant, and injecting the oxidant into an oxidant container (6) for later use;
s2, filling the seepage medium (12) into the reaction column (14), starting the submersible pump (4), and injecting the petroleum hydrocarbon polluted water sample in the sewage container (2) in the step S1 into the reaction column (14); then starting an oxidant injection pump (8), injecting the oxidant in the oxidant container (6) in the step S1 into the reaction column (14), enabling the petroleum hydrocarbon polluted water sample to be in contact oxidation with the oxidant, discharging the oxidized petroleum hydrocarbon polluted water sample out of the reaction column (14) through a liquid discharge port (18) after passing through a filtering inner core (66), and sampling and storing through a sampling port (22) every 1-5 hours;
s3, after the petroleum hydrocarbon polluted water sample is in contact reaction with the oxidant for 24-26h in the step S2, detecting and analyzing the sample obtained in the step S2, and finishing the treatment.
9. The method for treating petroleum hydrocarbon pollutants in underground water as claimed in claim 8, wherein in step S2, the mass ratio of the injection amount of the petroleum hydrocarbon pollutants water sample to the injection amount of the oxidant is 1 (2-5); the oxidant is sodium ferrate oxidant and/or potassium ferrate oxidant.
10. The method for treating petroleum hydrocarbon pollutants in groundwater according to claim 8, wherein in step S2, the injection rate of the petroleum hydrocarbon pollutants water sample into the reaction column (14) is 0.003L/h-0.018L/h, and the injection rate of the oxidant into the reaction column (14) is 0.009L/h-0.048L/h.
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