CN117486354B - Non-homogeneous aquifer self-cleaning type groundwater chromium pollution removal system and method - Google Patents
Non-homogeneous aquifer self-cleaning type groundwater chromium pollution removal system and method Download PDFInfo
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- CN117486354B CN117486354B CN202311736540.1A CN202311736540A CN117486354B CN 117486354 B CN117486354 B CN 117486354B CN 202311736540 A CN202311736540 A CN 202311736540A CN 117486354 B CN117486354 B CN 117486354B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 61
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- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 43
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- Treatment Of Water By Oxidation Or Reduction (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The application belongs to the technical field of groundwater pollution control and relates to a system and a method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater. Aiming at the problems of uneven flow field distribution and easy passivation of repair materials when the in-situ repair technology is applied, which are frequently faced in the treatment of the chromium pollution of the groundwater, the application provides a self-cleaning chromium pollution removal system for the groundwater of a non-homogeneous aquifer, which comprises a reaction well and a pumping and injecting well, wherein a cathode module and an anode module are respectively arranged in the well; the inner cavity of the reaction well is nested with a first baffle plate and a second baffle plate to form a cleaning area and a reaction area, and the bottom of the reaction well is provided with a first lifting chassis and a second lifting chassis respectively; the second partition board is provided with a friction part, a regenerated filler return port is arranged above the second partition board, and a passivation filler discharge port is arranged below the second partition board. The application combines the bioelectrochemistry method and the adsorption method, obviously improves the chromium pollution restoration effect, realizes the in-situ activation of the adsorption material by constructing the self-cleaning device, solves the material passivation problem, and can greatly reduce the replacement cost of the filler.
Description
Technical Field
The invention belongs to the technical field of groundwater pollution control, and particularly relates to a system and a method for removing chromium pollution from self-cleaning groundwater of a non-homogeneous aquifer.
Background
Chromium pollution in groundwater refers to the fact that the concentration of chromium elements in groundwater exceeds environmental quality standards, which causes potential threats to the environment and human health. Chromium is a metallic element widely existing in nature, and is generally present in the form of trivalent chromium (Cr (III)) and hexavalent chromium (Cr (VI)). Cr (III) is a common chromium form, generally more stable and relatively less toxic to humans. However, cr (VI) is highly toxic to human health and can cause various health problems such as skin ulcers, respiratory damage, and potential carcinogenesis. Groundwater chromium pollution is often caused by human activity, including industrial production, wastewater discharge, landfill sites, chrome ore mining and waste disposal processes. Chemicals and materials in industrial applications, such as chromates, leather processing, metal surface treatments, etc., are often the primary sources of chromium contamination. These activities lead to penetration of chromium ions into the groundwater system, causing chromium concentrations to exceed standards, threatening the safety of local water resources and human health. To solve the problem of chromium pollution in groundwater, a number of technical approaches have been used, including but not limited to physicochemical, bioremediation and geological engineering. Physicochemical methods include adsorption, reduction precipitation, electrochemical treatment, etc., to reduce pollution by changing the chemical morphology of chromium or removing it from the body of water. Bioremediation utilizes microorganisms to degrade chromium pollutants, and accelerates the natural degradation process. Geological engineering means include isolating and sequestering contaminated areas to prevent chromium diffusion to surrounding areas.
At present, the treatment method of hexavalent chromium in groundwater mainly comprises extraction treatment, chemical agent injection, an electrochemical method and barrier repair. For example, the publication number of Chinese patent application is CN106348418A, the application date is 2016, 09 and 12, and the name is: a chromium-polluted underground water in-situ chemical and biological combined restoration method is disclosed, wherein the method comprises the steps of arranging a pumping well and a water supplementing well in a pollution source area, and controlling the pollution of the underground water in the pollution source area by adopting a pumping-treatment-recharging treatment method; and sequentially adding a chemical reducing agent and a biological reducing agent in the pollution plume areas outside the pollution sources in an in-situ injection well injection or direct pressure injection mode, and treating hexavalent chromium in the pollution plume areas. The extraction treatment mode adopted by the scheme needs hexavalent chromium reduction and precipitation treatment by means of a sewage treatment reaction device, the reaction device occupies a large area, the interval between an extraction well and a recharging well is large, and the problem of non-uniformity of an underground water flow field can not be completely overcome; when the in-situ injection mode is adopted for carrying out the reduction treatment of hexavalent chromium in the underground water, the effect of injecting hexavalent chromium is greatly influenced by the stratum structure due to the non-uniformity of stratum conditions in the field, and part of the chemical agent cannot permeate into a polluted area, so that the efficient reduction of hexavalent chromium is limited, and the chemical agent cost is wasted. For another example, the Chinese patent application publication number is CN114573078A, the application date is 2022, 02 and 17, and the name is: the method adopts a mode of enriching and then reducing to degrade hexavalent chromium by constructing an electrochemical system. The method uses the electromigration principle to enrich hexavalent chromium, which consumes more electric energy, and the double cathode setting of the method has higher requirements on a reaction system and needs to accurately control electrode spacing and voltage and current parameters, so the method has difficulty under the practical application condition. For example, the publication number of the Chinese patent application is CN105414160A, the application date is 2015, 12 months and 18 days, and the name is: the device comprises a pumping well, a well pipe and a submerged pump, wherein the pumping well is internally provided with the well pipe, the middle lower part of the well pipe is provided with a screen pipe, the submerged pump is arranged in the screen pipe, one end of the conduit is connected and communicated with a water outlet of the submerged pump, and the other end of the conduit extends out of the well pipe and is connected and communicated with a booster pump on the ground; the outlet of the booster pump is connected with the main water distribution pipe, the plurality of branch water distribution pipes are connected with the main water distribution pipe, the stuffing box is provided with an adsorption filling layer and a reduction reaction stuffing layer from top to bottom, the plurality of branch water distribution pipes are radially arranged at the lower part of the reduction reaction stuffing layer, the permeable layer is arranged in the outer baffle, the stuffing box is arranged in the permeable layer and is surrounded by permeable medium in the permeable layer, the top of the outer baffle is provided with an upper cover plate, and an overflow flow passage is arranged between the top of the stuffing box and the upper cover plate. The main mechanism of the invention is that the downstream groundwater is pumped out and flows through the reaction area and the adsorption area of the reducing filler in an up-flow mode, and then enters the permeable layer from the overflow channel and enters the upstream groundwater. In the method, although the cover plate design is adopted to provide convenience for filler replacement, most of reduction and adsorption are interface reactions, especially the surface of the material is easily wrapped by trivalent chromium precipitates, so that the passivation of the reaction material is caused, and the method is easy to face the problem that the repair material needs to be replaced frequently.
In summary, the existing underground water chromium pollution treatment technology has the problems of limitation and practicality, and although the existing integrated technology for coupling different chromium pollution treatment methods is mostly simple superposition of different methods, the in-situ repair requirement cannot be effectively met, and particularly, the existing underground water chromium pollution treatment technology has more defects when facing complex hydrogeological environments (such as heterogeneous aquifer chromium pollution).
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the technical problems that the existing underground water hexavalent chromium in-situ removal scheme is greatly influenced by the uneven flow field of the underground water and the repair material is easy to passivate, the application provides a heterogeneous water-bearing layer self-cleaning type underground water chromium pollution efficient removal system which can better eliminate the uneven influence of the underground water flow field and realize the self-cleaning effect of the repair filler. The system effectively solves the problem of uneven distribution of the flow field of the polluted site in a multi-well combined mode; the chromium pollution restoration efficiency is obviously improved by the coupling mode of bioelectrochemistry, adsorption and reduction technology; the service life of the repairing material is prolonged and the repairing cost is reduced by the reactivating device of the repairing material in the reaction well, and the repairing system is simple and easy to operate and can realize automatic control.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided is as follows:
the invention relates to a non-homogeneous aquifer self-cleaning type underground water chromium pollution removal system, which comprises a reaction well and a pumping and injecting well; a cathode module is arranged in the reaction well, and an anode module is arranged in the pumping and injecting well; the bottom of the side wall of the reaction well is provided with water seepage holes;
A first baffle plate and a second baffle plate are nested in an inner cavity of the reaction well, and a cleaning area and a reaction area are formed in the inner cavity; the bottoms of the cleaning zone and the reaction zone are respectively provided with a first lifting chassis and a second lifting chassis, and the first lifting chassis and the second lifting chassis are provided with water seepage parts;
A friction part is arranged on the second partition board, a regenerated filler reflux port is arranged above the friction part, and a passivation filler discharge port is arranged below the friction part; the regenerated filler reflux port and the passivated filler discharge port are both provided with one-way valves, the one-way valve of the regenerated filler reflux port is opened to the reaction zone, and the one-way valve of the passivated filler discharge port is opened to the cleaning zone.
Preferably, the lifting rope on the second lifting chassis winds a linear cathode, and the linear cathode is connected with the cathode module in series.
Further, the friction part is provided with a thorn protruding towards the cleaning area; the thorn protruding is a plurality of.
Further, one end of the first lifting chassis, which is close to the first partition board, is higher than one end of the first lifting chassis, which is close to the second partition board; and the middle part of the second lifting chassis bulges.
Further, the cathode module is arranged on the inner wall of the reaction well; the anode module is columnar and is arranged in the cavity of the pumping and injecting well.
Furthermore, the pumping and injecting wells are multiple and distributed around the reaction well.
The method for removing the self-cleaning type chromium pollution of the underground water of the non-homogeneous aquifer comprises the following steps of:
The method comprises the steps of placing regenerated filler in the reaction zone, and performing bioelectrochemistry and physical adsorption reduction on hexavalent chromium to obtain passivated filler;
Comprising the step of pulling the second pulling tray so that the passivation filler enters the cleaning zone through the passivation filler discharge outlet;
The method comprises the steps of lifting the first lifting chassis to enable the passivation filler to be activated through the friction part, so as to obtain regenerated filler;
Comprising the step of re-entering said reaction zone through said regenerated filler return port.
Further, the regenerated filler comprises gel curing microbial inoculum filler and mineral adsorption filler.
Further, the gel-curing microbial inoculum filler comprises one or more species of bacteria; the strain has chromium reduction conversion capability.
Preferably, the method comprises the steps of, the strain is a bacillus, a sulfate reducing bacterium, a Arthrobacter micrococcus, corynebacteria, bacillus, thiobacillus or pseudomonas.
Further, the mineral adsorbing filler comprises one or more minerals; the mineral has the ability to adsorb hexavalent chromium.
Preferably, the mineral is medical stone, chitosan, activated carbon or zeolite.
Further, the method also comprises the step of pumping water in the reaction well into the pumping and injecting well and back flushing the regenerated filler in the reaction well.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) The invention relates to a non-homogeneous aquifer self-cleaning type groundwater chromium pollution removal system, which comprises a reaction well and a pumping and injecting well, wherein a cathode module and an anode module are respectively arranged, a first baffle plate and a second baffle plate are nested in an inner cavity to form a cleaning area and a reaction area, the cleaning area and the reaction area are used for bearing filler, bioelectrochemical treatment and physical absorption are organically combined, and compared with a single treatment method, the hexavalent chromium groundwater pollution restoration efficiency is higher. The friction part is also arranged on the second baffle plate and used for carrying out activation regeneration on the filler after a period of use, the whole process of activation regeneration is not needed, a filler taking-out device is not needed, in-situ regeneration is realized, and compared with the prior art, the system of the scheme is used for replacing new materials or leaving a device body for regeneration, the material replacement times are reduced, the cost is reduced, and meanwhile, the repairing efficiency is improved.
(2) According to the method for removing the pollution of the non-homogeneous aquifer self-cleaning type underground water chromium, disclosed by the invention, the filler is placed in the reaction zone, and bioelectrochemistry and physical adsorption are carried out to reduce hexavalent chromium, so that the limitation of single use of bioelectrochemistry and physical adsorption is overcome, the repairing efficiency is high, and the problem of poor simple superposition effect of different methods is solved. The filler after a period of use realizes activation regeneration through the friction part, reduces the material replacement times, shortens the waiting time between batches, and improves the treatment efficiency. Meanwhile, the self-cleaning effect can be realized through an automatic system and monitoring.
Drawings
FIG. 1 is a schematic diagram of a first perspective view of a non-homogeneous aquifer self-cleaning groundwater chromium pollution removal system in example 1;
FIG. 2 is a schematic top cross-sectional view of the non-homogenous aquifer self-cleaning groundwater chromium pollution removal system of example 1;
FIG. 3 is a schematic side cross-sectional view of the non-homogenous aquifer self-cleaning groundwater chromium pollution removal system of example 1;
FIG. 4 is a schematic view of a first view of the second separator and the first lift pan of example 1;
FIG. 5 is a first cross-sectional schematic view of the second separator, first lift pan and second lift pan of example 1;
FIG. 6 is a schematic view of a check valve in example 1;
FIG. 7 is a second cross-sectional view of the second separator, first lift pan and second lift pan of example 1;
FIG. 8 is an enlarged view of area A of FIG. 7;
FIG. 9 is a schematic diagram of the reaction well and pumping well layout in example 1.
In the figure:
1. A reaction well; 2. a first separator; 3. a second separator; 4. a first lifting chassis; 5. a second lifting chassis; 6. regenerating the filler return port; 7. a passivation filler discharge port; 8. a friction part; 9. water seepage holes; 10. lifting a rope; 11. a one-way valve; 12. a limit rod; 13. a limit groove; 14. a connecting piece; 15. a thorn bulge; 16. pumping and injecting well; 17. an anode module; 18. a cathode module; 19. a cleaning zone; 20. a reaction zone.
Detailed Description
The invention is further described below in connection with specific embodiments.
The following description of the embodiments of the present invention will be made more fully hereinafter with reference to the accompanying drawings, in which it is shown, however, in which some, but not all embodiments of the invention are shown; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The strain used in the embodiment of the application is commercial strain purchased by the applicant, and the biological material preservation information of the strain is as follows: the strain of reducing Acetobacter sphaeroides, latin is named Intrasporangium chromatireducens, and is preserved in China general microbiological culture collection center (CGMCC) (address: china general microbiological institute of sciences, china academy of sciences, including Qingyang North Star, west Lu No.1 and No. 3) in 11 th month 01 of 2010, with a preservation number of CGMCC No.1.10750.
Example 1
The system for removing the chromium pollution of the self-cleaning groundwater of the non-homogeneous aquifer of the embodiment comprises a plurality of reaction wells 1 and pumping and injecting wells 16 as shown in fig. 1-9, wherein the pumping and injecting wells 16 of the embodiment are distributed around the reaction wells 1, so that the problem of uneven flow field during in-situ treatment of chromium pollution of the groundwater is solved. The reaction well 1 is internally provided with a cathode module 18, the pumping and injecting well 16 is internally provided with an anode module 17, the cathode module 18 is arranged on the inner wall of the reaction well 1, the occupation of an inner cavity is reduced, the treatment volume in the inner cavity is increased, and the anode module 17 is columnar and is arranged in the inner cavity of the pumping and injecting well 16. In other embodiments, a wire-type winding cathode can be arranged on the lifting rope 10 and connected in series with the cathode module 18 on the inner wall of the reaction well 1. The side walls of the reaction well 1 and the pumping and injecting well 16 are provided with water seepage holes 9.
The first partition board 2 and the second partition board 3 are nested in the inner cavity of the reaction well 1, and a cleaning area 19 and a reaction area 20 are formed in the inner cavity. A friction part 8 is arranged on the second partition plate 3, a regenerated filler return port 6 is arranged above the friction part 8, and a passivation filler discharge port 7 is arranged below the friction part 8; the regenerated filler return port 6 and the passivated filler discharge port 7 are both provided with a one-way valve 11, the one-way valve 11 of the regenerated filler return port 6 is opened to the reaction zone 20, and the one-way valve 11 of the passivated filler discharge port 7 is opened to the cleaning zone 19. The bottom of the regenerated filler return opening 6 and the bottom of the passivated filler outlet 7 are both provided with a limiting rod 12, the second partition plate 3 is provided with a limiting groove 13 matched with the limiting rod 12, the one-way valve 11 and the limiting groove 13 of the regenerated filler return opening 6 are arranged on the side wall of the second partition plate 3 far away from the first partition plate 2, and the one-way valve 11 and the limiting groove 13 of the passivated filler outlet 7 are arranged on the side wall of the second partition plate 3 close to the first partition plate 2. The non-return valve 11 is arranged on the second partition 3 by means of a connection piece 14.
The friction part 8 is provided with a plurality of thorns 15 extending towards the cleaning zone 19, in this embodiment a plurality of thorns 15, the thorns 15 being long enough to contact the side wall of the first separator 2 adjacent to the second separator 3, forming a plurality of strip-shaped structures. In other embodiments, the friction portion 8 may be disposed on the first separator plate 2, with the protrusions 15 being long enough to contact the side wall of the second separator plate 3 adjacent to the first separator plate 2, forming a plurality of strip-like structures. In other embodiments, the friction portion 8 may be a mesh structure disposed between the first separator 2 and the second separator 3, or the like, so as to scratch and squeeze the filler surface layer, so that the filler surface layer may fall off.
The bottoms of the cleaning zone 19 and the reaction zone 20 are respectively provided with a first lifting chassis 4 and a second lifting chassis 5, and the first lifting chassis 4 and the second lifting chassis 5 are provided with water seepage parts, so that chromium-polluted underground water can enter the cleaning zone 19 and the reaction zone 20. One end of the first lifting chassis 4 close to the first partition board 2 is higher than one end close to the second partition board 3; the second lifting chassis 5 bulges in the middle, facilitating the filler to slide into the cleaning zone 19 or the reaction zone 20 by gravity.
Example 2
The method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater of the present example, using the system of example 1, comprises the following steps:
The system is arranged on a chromium pollution site pollution plume, the aperture of a reaction well 1 is 40cm, 4 pumping and injecting wells 16 (aperture is 10 cm) are arranged on the periphery of the reaction well 1 along the whole flow direction of the underground water of the site, the horizontal distance between the well mouth of the pumping and injecting well 16 and the well mouth of the reaction well 1 is 10m, and the connecting line of the upstream pumping and injecting well 16 and the downstream pumping and injecting well 16 is perpendicular to the whole flow direction of the underground water. Before the reaction, a filler is placed in the reaction zone 20, and the filler in this embodiment includes a mineral adsorption filler and a gel curing microbial inoculum filler, wherein the mineral adsorption filler adopts a particle sphere with a particle size of 6mm, which is prepared by chitosan and zeolite according to a mass ratio of 1:1, and the gel curing microbial inoculum filler adopts a gel sphere with a particle size of about 3mm, which is composed of mesocyst bacteria, a slow-release carbon source and gel. In other embodiments, the mineral adsorption filler can also be formed by mixing medical stone, active carbon, iron oxide and other mineral materials according to a certain proportion, and the gel curing microbial inoculum filler can also be formed by one or more bacteria with chromium reduction and conversion capability, such as bacteria such as sulfate reducing bacteria, arthrobacter, micrococcus, corynebacteria, bacillus, thiobacillus, pseudomonas and the like. Starting a controller connected with the anode module 17 and the cathode module 18, and performing cooperative degradation of chromium pollution by bioelectrochemical action and physical adsorption, wherein the voltage of a bioelectrochemical system is controlled to be 10-20V/m (different from the high voltage density adopted by electric repair), and the hexavalent chromium concentration of two upstream monitoring wells is 8.7mg/L and 12.5mg/L when the system is constructed; the hexavalent chromium concentration of the two downstream monitoring wells is 9.6mg/L and 15.6mg/L respectively, which shows that although the actual pollution distribution of the field cannot be consistent with the whole flow field of the underground water, namely the field has a local turbulence phenomenon, and the field is a heterogeneous aquifer. When the pump of the pumping and injecting well 16 is not started, the system is in a passive treatment state, and chromium pollution is mainly removed by virtue of groundwater flowing into the reaction well 1. After one week, the hexavalent chromium concentration of the two upstream monitoring wells is 11.7mg/L and 13.6mg/L, and the hexavalent chromium concentration of the two downstream monitoring wells is 3.9mg/L and 9.5mg/L respectively, which indicates that the reaction well 1 is in a passive operation mode, but still obtains a relatively obvious chromium pollution treatment effect. After the water pump of the pumping and injecting well 16 is started, the daily water pumping amount of each pumping and injecting well 16 is set to be 20m 3/d, the reaction well 1 is provided with a water level early warning device, when the set water level is reached, the water pump of the pumping and injecting well 16 stops working, and when the water level is lower than the early warning water level, the water pump is restarted. After the system runs for one week, the hexavalent chromium concentration of the two upstream monitoring wells is 5.8mg/L and 7.6mg/L, and the hexavalent chromium concentration of the two downstream monitoring wells is 0.2mg/L and 0.9mg/L respectively, so that the uniformity of the chromium pollution concentration distribution and the pollution treatment effect of the field are obviously improved compared with those of the pumping and injecting well 16 before the water pump works.
Example 3
The method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater of the present example, using the system of example 1, comprises the following steps:
The water pump of the pumping and injecting well 16 is started, the daily water pumping amount of each pumping and injecting well 16 is set to be 20m 3/d, and the voltage of the bioelectrochemical system is controlled to be 10-20V/m (different from the high voltage density adopted by electric repair). After the system runs for 2 months under the conditions of continuous power supply and pumping injection, the hexavalent chromium concentration of the two upstream monitoring wells is 8.9mg/L and 7.8mg/L, the hexavalent chromium concentration of the two downstream monitoring wells is 2.7mg/L and 1.8mg/L respectively, and the chromium pollution treatment effect of the system is reduced. At this time, the filler self-cleaning device is started, the system pulls the second lifting chassis 5, the filler to be activated enters the cleaning area 19 through the passivating filler discharge port 7, and the filler passes through the passivating filler discharge port 7 and presses the one-way valve 11 to fall into the cleaning area 19 based on the gravity inertia action of the filler and the height difference formed by the bulge in the middle of the second lifting chassis 5. After the filler falls into the cleaning zone 19, the lifting rope 10 is lifted, the first lifting chassis 4 is lifted to drive the filler to move upwards, when the filler passes through the passivated filler discharge port 7, the filler cannot fall into the reaction zone 20 due to the obstruction of the one-way valve 11, and substances such as trivalent chromium hydroxide deposited on the surface of the filler are adsorbed and reduced when the filler passes through the friction part 8, and can be removed through extrusion scraping, so that the activation regeneration of the filler is realized, and when the first lifting chassis 4 is lifted continuously, the filler can fall into the reaction zone 20 through the regenerated filler reflux port 6. After the filler is self-cleaned for one week, the hexavalent chromium concentration of the two upstream monitoring wells is changed into 6.9mg/L and 4.8mg/L, and the hexavalent chromium concentration of the two downstream monitoring wells is respectively 0.7mg/L and 1.2mg/L, which indicates that the filler cleaning effect is obvious. The self-cleaning cycle of the filler is taken, after the system is continuously operated for 2 months, the hexavalent chromium concentration of the two upstream monitoring wells is 4.9mg/L and 5.8mg/L, and the hexavalent chromium concentration of the two downstream monitoring wells is 0.3mg/L and 0.8mg/L respectively, so that the self-cleaning mode can effectively solve the problem of filler passivation.
Example 4
The method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater of this example used the system of example 1, except that: before the reaction, a filler is placed in the reaction zone 20, and the filler in this embodiment includes a mineral adsorption filler and a gel curing filler, wherein the mineral adsorption filler adopts a particle sphere with a particle size of 6mm, which is prepared by chitosan and zeolite according to a mass ratio of 1:1, and the gel curing filler adopts a gel sphere with a particle size of about 3mm, which is formed by a slow-release carbon source and gel. The reaction system starts the water pump of the pumping and injecting well 16, the daily water pumping amount of each pumping and injecting well 16 is set to be 20m 3/d, and the voltage of the bioelectrochemical system is controlled to be 10-20V/m (different from the high voltage density adopted by electric repair). In the initial reaction, the hexavalent chromium concentration of the two upstream monitoring wells is 5.7mg/L and 10.2mg/L, and the hexavalent chromium concentration of the two downstream monitoring wells is 9.7mg/L and 8.3mg/L respectively; after one week, the hexavalent chromium concentration of the two upstream monitoring wells is 7.7mg/L and 6.2mg/L, and the hexavalent chromium concentration of the two downstream monitoring wells is 2.1mg/L and 3.5mg/L respectively. At this time, after the self-cleaning process is completed, the filler is taken out, and gel curing microbial inoculum filler (gel sphere with the particle size of about 3mm formed by the metacyst, the slow-release carbon source and gel) is mixed again, and after one week, the hexavalent chromium concentration of the two monitoring wells at the upstream is 5.2mg/L, 6.5mg/L and the hexavalent chromium concentration of the two monitoring wells at the downstream is 0.2mg/L and 1.1mg/L respectively. The system has a certain indigenous biostimulation effect under the condition of lacking the curing microbial inoculum, but can obtain a better chromium pollution treatment effect after the curing microbial inoculum is added.
Example 5
The method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater of this example used the system of example 1, except that: before the reaction, only a gel-setting filler, which is a gel sphere having a particle diameter of about 3mm and composed of a slow-release carbon source and gel, was placed in the reaction zone 20. The reaction system starts the water pump of the pumping and injecting well 16, the daily water pumping amount of each pumping and injecting well 16 is set to be 20m 3/d, and the voltage of the bioelectrochemical system is controlled to be 10-20V/m. In the initial reaction, the hexavalent chromium concentration of the two upstream monitoring wells is 13.1mg/L and 12.2mg/L, and the hexavalent chromium concentration of the two downstream monitoring wells is 8.9mg/L and 10.3mg/L respectively; after one week, the hexavalent chromium concentration of the two downstream monitoring wells is 6.1mg/L and 3.4mg/L respectively. At this time, mineral repairing filler with the particle size of 6mm, which is prepared by chitosan and zeolite according to the mass ratio of 1:1, is added, and after one week, the hexavalent chromium concentration of two downstream monitoring wells is respectively 0.5mg/L and 1.3mg/L. The system is characterized in that the mineral adsorption material has an important contribution in the chromium pollution removal process, and the system can obtain a better groundwater chromium pollution restoration effect under the combined action of bioelectrochemistry and a microbial inoculum through the adsorption of the mineral material to hexavalent chromium.
Example 6
The method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater of this example used the system of example 1, except that: the bioelectrochemical system was in a power-off state at the beginning of the reaction, and the other filler addition and pumping operation modes were the same as in example 2. In the initial reaction, the hexavalent chromium concentration of the two upstream monitoring wells is 11.4mg/L and 7.5mg/L, and the hexavalent chromium concentration of the two downstream monitoring wells is 12.6mg/L and 11.7mg/L respectively; after one week, the concentration of hexavalent chromium in two monitoring wells at the downstream is reduced to 5.7mg/L and 5.3mg/L; at the moment, the bioelectrochemical system is started, the voltage is controlled to be 10-20V/m, after one week, the hexavalent chromium concentration of two downstream monitoring wells is obviously reduced to 1.7mg/L and 0.6mg/L, which shows that the bioelectrochemical system has obvious synergistic treatment effect on the system and has important contribution.
Claims (10)
1. A non-homogeneous aquifer self-cleaning type groundwater chromium pollution removal system is characterized in that: comprises a reaction well (1) and a pumping and injecting well (16); a cathode module (18) is arranged in the reaction well (1), and an anode module (17) is arranged in the pumping and injecting well (16); the bottom of the side wall of the reaction well (1) is provided with water seepage holes (9);
The inner cavity of the reaction well (1) is provided with a first baffle plate (2) and a second baffle plate (3) in a nested manner, and a cleaning area (19) and a reaction area (20) are formed in the inner cavity; the bottoms of the cleaning zone (19) and the reaction zone (20) are respectively provided with a first lifting chassis (4) and a second lifting chassis (5), and the first lifting chassis (4) and the second lifting chassis (5) are provided with water seepage parts;
A friction part (8) is arranged on the second partition plate (3), a regenerated filler reflux port (6) is arranged above the friction part (8), and a passivation filler discharge port (7) is arranged below the friction part (8); the regeneration filler reflux mouth (6) and the passivation filler discharge outlet (7) are both provided with one-way valves (11), the one-way valves (11) of the regeneration filler reflux mouth (6) are opened to the reaction zone (20), and the one-way valves (11) of the passivation filler discharge outlet (7) are opened to the cleaning zone (19).
2. The non-homogeneous aquifer self-cleaning groundwater chromium pollution removal system of claim 1 wherein: the friction part (8) is provided with a thorn protrusion (15) extending to the cleaning area (19); the number of the thorn bosses (15) is plural.
3. The non-homogeneous aquifer self-cleaning groundwater chromium pollution removal system of claim 1 wherein: one end of the first lifting chassis (4) close to the first partition board (2) is higher than one end of the first lifting chassis close to the second partition board (3); the middle part of the second lifting chassis (5) is raised.
4. The non-homogeneous aquifer self-cleaning groundwater chromium pollution removal system of claim 1 wherein: the cathode module (18) is arranged on the inner wall of the reaction well (1); the anode module (17) is columnar and is arranged in the inner cavity of the pumping and injecting well (16).
5. A non-homogenous aquifer self-cleaning groundwater chromium pollution removal system according to any one of claims 1-4 wherein: the pumping and injecting wells (16) are multiple and distributed around the reaction well (1).
6. A method for removing chromium pollution from self-cleaning groundwater of a non-homogeneous aquifer is characterized in that: use of the heterogeneous aquifer self-cleaning groundwater chromium pollution removal system of any one of claims 1-5, comprising the steps of:
Comprises the steps of placing regenerated filler in the reaction zone (20), and performing bioelectrochemistry and physical adsorption reduction on hexavalent chromium to obtain passivated filler;
Comprising the step of pulling the second pulling chassis (5) such that the passivating filler enters the cleaning zone (19) through the passivating filler discharge opening (7);
Comprises the step of pulling the first pulling chassis (4) so that the passivating filler is activated by the friction part (8) to obtain a regenerated filler;
comprising the step of re-entering said reaction zone (20) through said regenerated filler return port (6).
7. The method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater of claim 6, wherein: the regenerated filler comprises gel curing microbial inoculum filler and mineral adsorption filler.
8. The method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater of claim 7, wherein: the gel curing microbial inoculum filler comprises one or more species of bacteria; the strain has chromium reduction conversion capability.
9. The method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater of claim 7, wherein: the mineral adsorbing filler comprises one or more minerals; the mineral has the ability to adsorb hexavalent chromium.
10. A method for removing chromium pollution from non-homogeneous aquifer self-cleaning groundwater according to any one of claims 6 to 9, wherein: the method also comprises the step of pumping water in the reaction well (1) into the pumping and injecting well (16) and back flushing the regenerated filler in the reaction well (1).
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