In-situ chemical oxidation material long-acting accurate release dynamic control technologyTechnical Field
The invention relates to the technical field of groundwater remediation and purification, in particular to a dynamic control technology for long-acting accurate release of an in-situ chemical oxidation material.
Background
Underground water is a precious fresh water resource for human beings, but with the continuous development of the social industrialization process, the problems of waste water discharge, industrial waste residues, agricultural irrigation, landfill site leakage, damage of transport pipelines and storage tanks of petrochemical raw materials and the like can cause underground water pollution, so that the problem of water resource shortage which is originally short is more serious, and serious threats and challenges are formed for living health, food safety, drinking water safety, regional ecological environment, sustainable development of economic society and even social stability, and underground water restoration becomes an environmental problem which is currently concerned by the public and the society.
The repair technology of the polluted underground water comprises an extraction technology, an air stripping technology, a bioremediation technology, a permeable reactive wall technology, an in-situ chemical repair and the like. The in-situ chemical remediation technology is a method for reducing and removing pollutants in a polluted environment by using a chemical reducing agent, is mainly used for pollution control of underground water, is a method for in-situ removal of harmful components in polluted water emerging in developed countries such as Europe and America, and is mainly used for remedying pollutants sensitive to reduction in underground water, such as chromate, nitrate and some chlorinated reagents, and a reaction area is usually arranged below polluted soil or in a water-containing soil layer near a pollution source.
In the existing in-situ chemical remediation technology, an in-situ chemical oxidation material is mainly placed in a remediation well to remediate polluted groundwater, however, the concentration of the polluted groundwater is changed, the requirement for controlling the release amount of the in-situ chemical oxidation material is high, if the release amount is too low, the pollution of the groundwater cannot be effectively remediated, if the release amount is too high, the in-situ chemical oxidation material is wasted, the service life of the in-situ chemical oxidation material is short, and the overall remediation cost is increased.
Disclosure of Invention
The invention aims to solve the technical problems and provides a long-acting accurate-release dynamic control technology for an in-situ chemical oxidation material, which has high repair reaction efficiency and can continuously repair underground water pollution for a long time.
The technical scheme for solving the technical problems is as follows:
an in-situ chemical oxidation material long-acting accurate release dynamic control technology for groundwater remediation, the control technology comprising:
s1: excavating a repair well penetrating through the underground water pollution plume;
s2, sequentially installing a plurality of sections of repair units in a repair well in sections, wherein each section of repair unit is hermetically filled with an in-situ chemical oxidation material for repairing pollution plume, and each section of repair unit is provided with a control switch for controlling the release of the in-situ chemical oxidation material;
s3, searching a repairing unit corresponding to the pollution plume, opening a control switch corresponding to the repairing unit, releasing the in-situ chemical oxidation material, and repairing the pollution plume.
The invention has the beneficial effects that: according to the invention, the in-situ chemical oxidation material is filled in the repairing unit and the control switch is arranged, so that the release amount of the in-situ chemical oxidation material can be adjusted, the release of the in-situ chemical oxidation material can be controlled by searching the repairing unit corresponding to the pollution plume, the reaction efficiency of repairing and purifying the pollution plume can be improved, the repairing with stable length can be achieved, the waste of the in-situ chemical oxidation material can be avoided, and the overall repairing cost can be reduced.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in step S1, before the restoration well is excavated, pollution plumes of the groundwater are determined through groundwater pollution investigation, then a stable isotope method or a stratified sampling method is used to obtain distribution conditions of the pollution plumes, and finally the restoration well is excavated according to the distribution conditions of the pollution plumes.
The beneficial effect of adopting the further scheme is that: the excavation position of the Fujin can be effectively positioned and repaired according to the distribution of pollution feathers, and the repair efficiency of underground water is improved.
Further, in step S1, at least one of the repair wells is excavated.
The beneficial effect of adopting the further scheme is that: the remediation well can effectively remediate the pollution plume.
Further, in step S2, the in-situ chemical oxidation material is a sheet or granular structure made by mixing permanganate and paraffin according to a mass ratio of (5-15) to (95-85).
The beneficial effect of adopting the further scheme is that: the permanganate can be effectively released to repair by adopting a flaky or granular structure which is supported by mixing permanganate and paraffin.
Further, in step S2, the in-situ chemical oxidation material of each segment of the repair unit is filled in a cylindrical shape, and the filling amount of the in-situ chemical oxidation material is adjusted by changing the filling diameter of the in-situ chemical oxidation material.
The beneficial effect of adopting the further scheme is that: the reaction efficiency of filling the in-situ chemical oxidation material by adopting the cylindrical shape is high.
Further, in step S2, each segment of the repair unit is cylindrical, a plurality of release openings are formed in a cylindrical side wall of each segment of the repair unit, and the control switch controls the release openings to be opened and closed and adjusts the opening of the release openings.
The beneficial effect of adopting the further scheme is that: the side wall of the repair unit is provided with a release port which can release in-situ chemical oxidation materials to repair pollution plume.
Further, in step S3, the searching for the repairing unit corresponding to the pollution plume is to locate the repairing position of the repairing well according to the distribution of the pollution plume, determine the repairing length in the repairing well, and finally search for the repairing unit corresponding to the pollution plume according to the repairing length.
The beneficial effect of adopting the further scheme is that: the found corresponding repairing unit can directly repair the pollution plume, the repairing efficiency is guaranteed, when other pollution plumes exist in the repairing well, the control switch can be turned on to continue repairing, and the utilization rate of the in-situ chemical oxidation material of the repairing unit is high.
Further, in step S3, the in-situ chemical oxidation material is released by controlling the opening of the control switch, where the opening of the control switch is to divide the pollution plume into a high-concentration plume, a medium-concentration plume, and a low-concentration plume according to the concentration, calculate target release amounts of the in-situ chemical oxidation material required for repairing the high-concentration plume, the medium-concentration plume, and the low-concentration plume, and respectively adjust the control switch to the opening that satisfies the target release amounts required for repairing the high-concentration plume, the medium-concentration plume, and the low-concentration plume.
The beneficial effect of adopting the further scheme is that: the opening degree of the control switch can be adaptively adjusted by dividing the concentration of the pollution plume, the concentration of the pollution plume can be dynamically adapted to be repaired, and the repairing cost can be saved.
Further, in step S3, after the in-situ chemical oxidation material is released, the water quality of the upstream and downstream is periodically detected, and the release amount of the in-situ chemical oxidation material is adjusted.
The beneficial effect of adopting the further scheme is that: the repairing effect can be determined by detecting the water quality of the upstream and downstream, the release amount of the in-situ chemical oxidation material is adjusted, the problem that the concentration of the pollution plume is increased due to the influence of the environment on the pollution plume or the problem that the concentration of the pollution plume is reduced and the release amount is not matched in the repairing process can be avoided, and the dynamic change of the pollution plume can be adapted by adjusting the release amount of the in-situ chemical oxidation material.
Further, in step S3, performing performance evaluation on the repaired and used repair unit, taking out the repair unit from the repair well, adjusting the position of the repair unit in the repair well, opening a control switch of the repair unit corresponding to the pollution plume, and continuing to repair the pollution plume.
The beneficial effect of adopting the further scheme is that: the pollution plume can be fully repaired by utilizing the in-situ chemical oxidation material by adjusting the position of the repairing unit in the repairing well.
Detailed Description
The principles and features of this invention are described in conjunction with the following examples, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Examples
The core of the invention is to provide a long-acting accurate release dynamic control technology of an in-situ chemical oxidation material, which is used for groundwater remediation, wherein firstly, pollution plumes are discovered through groundwater pollution investigation, then, the distribution condition of the pollution plumes is obtained by adopting a stable isotope method or a layered sampling method, the distribution condition of the pollution plumes is firstly obtained by sampling a plurality of underground vertical sections, concentration parameters are collected and drawn into a concentration profile, a distribution condition model of the pollution plumes is generated according to a plurality of concentration profile, at least one remediation well penetrating through the groundwater pollution plumes is excavated according to the quantity and the distribution condition of the remediation wells which need to be excavated by model design, the remediation wells can be arranged in an array, and the excavation position of the remediation wells can also be adjusted according to the regional concentration of the pollution plumes.
Sequentially installing a plurality of sections of repairing units in a repairing well in sections, wherein an in-situ chemical oxidation material for repairing pollution plume is hermetically filled in each section of repairing unit, and each section of repairing unit is provided with a control switch for controlling and releasing the in-situ chemical oxidation material; each section of the repair units are connected by screw threads, and the repair units are connected by screw threads into a columnar structure with the same length as the repair well
Searching a repairing unit corresponding to the pollution plume, opening a control switch corresponding to the repairing unit, releasing the in-situ chemical oxidation material, and repairing the pollution plume.
The in-situ chemical oxidation material is a sheet or granular structure prepared by mixing permanganate and paraffin according to a mass ratio of (5-15) to (95-85).
The in-situ chemical oxidation material of each section of the repair unit is filled into a cylindrical shape, and the filling amount of the in-situ chemical oxidation material is adjusted by changing the filling diameter of the in-situ chemical oxidation material.
Each section of the repairing unit is cylindrical, a plurality of releasing ports are formed in the cylindrical side wall of each section of the repairing unit, the releasing ports are controlled to be opened and closed through the control switch, and the opening degree of the releasing ports is adjusted.
And the step of searching the repairing unit corresponding to the pollution plume is to locate the repairing position of the repairing well according to the distribution condition of the pollution plume, determine the repairing length in the repairing well, and finally search the repairing unit corresponding to the pollution plume according to the repairing length.
The release of the in-situ chemical oxidation material is controlled by adjusting the opening of a control switch, the opening of the control switch is used for dividing the pollution plume into high-concentration plume, medium-concentration plume and low-concentration plume according to the concentration, calculating the target release amount of the in-situ chemical oxidation material required for repairing the high-concentration plume, the medium-concentration plume and the low-concentration plume, and respectively adjusting the control switch to the opening which meets the target release amount required for repairing the high-concentration plume, the medium-concentration plume and the low-concentration plume.
In the embodiment, the concentration of 1000-; in addition, the opening degree of the control switch of the high-concentration feather corresponding to the repair unit requires that the release amount of the in-situ chemical oxidation material is 20 times of the theoretical molar concentration of the pollution feather to be removed, so that the influence of impurities in underground water and the dilution effect of water flow on repair is avoided.
After the in-situ chemical oxidation material is released, the water quality of the upstream and downstream is periodically detected, and the release amount of the in-situ chemical oxidation material is adjusted, under normal conditions, the total rate of pollution plumes in underground water is generally within ten meters per year, so the period of the concentration change of the pollution plumes generally needs more than three months, and therefore the period of periodically detecting the water quality of the upstream and downstream is also taken as a unit of a quarter.
Performing performance evaluation on the repaired unit after the repairing unit is used, taking the repaired unit out of the repairing well, adjusting the position of the repaired unit in the repairing well, opening a control switch of the repaired unit corresponding to the pollution plume, and continuing to repair the pollution plume; the performance evaluation of the repair units is evaluated according to the loss of the in-situ chemical oxidation materials, along with the loss of the in-situ chemical oxidation materials of each section of repair units, when the opening degree of the control switch reaches 100%, the release amount of the in-situ chemical oxidation materials of the repair units cannot completely repair the corresponding pollution plumes with higher concentration, the release amount repairs the pollution plumes with lower concentration, the repair units in the repair wells are taken out, the positions of the repair units are adjusted, then the repair units are loaded into the repair wells, and the underground water pollution plumes are continuously repaired.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
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.