CN110947745A - In-situ bioreactor based on underground water circulation - Google Patents

In-situ bioreactor based on underground water circulation Download PDF

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Publication number
CN110947745A
CN110947745A CN201911167365.2A CN201911167365A CN110947745A CN 110947745 A CN110947745 A CN 110947745A CN 201911167365 A CN201911167365 A CN 201911167365A CN 110947745 A CN110947745 A CN 110947745A
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China
Prior art keywords
water
underground
bioreactor
polluted
pumping
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CN201911167365.2A
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Chinese (zh)
Inventor
李淑彩
吕正勇
冯国杰
刘泽军
魏丽
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Beijing Geoenviron Engineering and Technology Inc
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Beijing Geoenviron Engineering and Technology Inc
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Priority to CN201911167365.2A priority Critical patent/CN110947745A/en
Publication of CN110947745A publication Critical patent/CN110947745A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C2101/00—In situ
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/101—Sulfur compounds
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/163—Nitrates
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/22—Chromium or chromium compounds, e.g. chromates
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/36—Organic compounds containing halogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Microbiology (AREA)
  • Soil Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Biotechnology (AREA)
  • Mycology (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Biological Wastes In General (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

The invention discloses an in-situ bioreactor based on underground water circulation, which comprises: the bioreactor is arranged underground and excavated to polluted feather, and comprises an underground structure, and a microorganism packing layer, a covering layer and a water distribution pipe are arranged in the underground structure from bottom to top; the water pumping well is arranged in the downstream direction of the bioreactor, and a water pumping pipe of the water pumping well is connected with the water distribution pipe; the pumping well pumps out polluted underground water, the polluted underground water enters the water distribution pipe through the pumping pipe, and the polluted underground water enters the underground water after being treated by the microbial packing layer to form an underground water loop. The invention belongs to a green sustainable restoration technology which treats pollution by waste and promotes natural restoration; by pumping wells and biological back-seepage, migration and flow of underground water are promoted, and remediation and treatment with small disturbance on polluted sites can be realized; the invention has the advantages of less used equipment, low energy consumption, full utilization of green renewable energy sources and less secondary influence on the environment.

Description

In-situ bioreactor based on underground water circulation
Technical Field
The invention relates to the technical field of pollution treatment, in particular to an in-situ bioreactor based on underground water circulation, which is mainly used for in-situ remediation of polluted soil and underground water containing chlorine organic matters, petroleum hydrocarbon, hexavalent chromium, nitrate radicals, sulfate radicals and the like.
Background
At present, a large amount of chemical substances such as persulfate, hydrogen peroxide and the like are used in the remediation of polluted sites in China; and part of processes of adding medicaments are not needed, and equipment with higher energy consumption is often needed. Secondary pollution is likely to be caused by the use of a large amount of chemical substances; the use of high energy consuming equipment results in excessive carbon emissions.
Under the influence of a green sustainable restoration concept, renewable energy sources are adopted, natural wastes are used as restoration materials, and the effect of microorganisms in the field is fully exerted, so that green, safe and long-acting treatment on the polluted field is realized, the method is one of the current research hotspots, and the management concept of implementing risk control and restoration on the polluted field in China is also met.
Although many researchers in China have developed researches on the aspect of microbial remediation technology, the application of microbes in the aspect of in-situ remediation is less due to the influence of factors such as nutrient transmission and long microbial remediation period.
Disclosure of Invention
In order to solve the limitation of the microbial technology in the in-situ remediation application of a polluted site, fully utilize natural organic wastes and implement the concepts of treating pollution by wastes and continuously remedying the pollution in a green way, the invention provides the in-situ bioreactor based on the underground water circulation, which enlarges the application range of the microbial remediation technology and improves the remediation efficiency.
The invention discloses an in-situ bioreactor based on underground water circulation, which comprises:
the bioreactor is arranged underground and excavated to polluted feather, and comprises an underground structure, wherein a microorganism packing layer, a covering layer and a water distribution pipe are arranged in the underground structure from bottom to top;
the water pumping well is arranged in the downstream direction of the bioreactor, and a water pumping pipe of the water pumping well is connected with the water distribution pipe; the pumping well pumps out polluted underground water, the polluted underground water enters the water distribution pipe through the pumping pipe, and the polluted underground water enters the underground water after being treated by the microbial packing layer to form an underground water loop.
As a further improvement of the invention, the underground structure is a square structure, an underground large-caliber well or an underground groove.
As a further improvement of the invention, the microbial filler layer is a repair layer composed of a water-permeable material, a porous material, a nutrient material and a microbial medicament.
As a further improvement of the invention, the water permeable material comprises one or more of crushed stone, coarse sand and fine sand;
the porous material comprises one or more of zeolite, diatomite, volcanic rock, vermiculite, porous alumina, activated carbon and biomass carbon.
As a further development of the invention, the nutrient material is a carbon-containing and/or nitrogen-containing and/or phosphorus-containing substance that promotes the growth of indigenous or functional microorganisms;
the microbial agent is microbial flora and/or biological enzyme.
As a further development of the invention, the cover layer is a natural organic matter cover layer.
As a further improvement of the invention, the water distribution pipe is composed of a sieve or a PVC pipe with holes or a plastic hose.
As a further improvement of the invention, the system also comprises a power supply system;
and the power supply system is electrically connected with a water suction pump of the water suction well.
As a further improvement of the invention, the power supply system is a wind power supply system or a solar panel power supply system.
As a further improvement of the invention, the system also comprises a monitoring well;
the monitoring well is positioned between the pumping well and the bioreactor and is used for monitoring the pollutant content of underground water.
Compared with the prior art, the invention has the beneficial effects that:
1. the polluted underground water is continuously extracted by the pumping well, the water which reaches the standard and is treated in the bioreactor is recharged to the underground, and the degradation of pollutants is realized through continuous circulation, so that the microbial remediation efficiency is improved;
2. the porous material used in the invention is a natural material or a material similar to the soil in composition, and cannot cause secondary pollution;
3. according to the invention, the waste leaves, sawdust, crushed straws, rice hulls, wheat bran, bean pulp, vinasse and other substances rich in organic matters are used as covering materials in the bioreactor, so that the comprehensive utilization of the waste organic matters can be realized;
4. the bioreactor is arranged under the ground, so that the in-situ remediation of soil and underground water is realized, the development influence on the ground is small, and the pollution under a building can be remedied;
5. the invention adopts renewable energy as a main energy supply mode, and can obviously reduce energy consumption.
Drawings
FIG. 1 is a side view of a structure of an in situ bioreactor based on groundwater circulation as disclosed in example 1 of the present invention;
FIG. 2 is a top view of the structure of an in situ bioreactor based on groundwater circulation as disclosed in example 1 of the present invention;
FIG. 3 is a side view of the structure of an in situ bioreactor based on groundwater circulation disclosed in example 2 of the present invention.
In the figure:
1. a groundwater level line; 2. pumping a water well; 3. soil; 4. pollution feather; 5. a monitoring well; 6. a bioreactor; 7. a ground surface; 8. a water pumping pipe; 9. a wind power supply system; 10. solar cell panel power supply system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1 to 3, the present invention provides an in situ bioreactor based on groundwater circulation, comprising: a bioreactor 6, a pumping well 2 and matched equipment; wherein:
the bioreactor 6 is arranged underground and excavated to polluted feather, and comprises an underground structure, wherein a microorganism packing layer, a covering layer and a water distribution pipe are arranged in the underground structure from bottom to top; wherein the content of the first and second substances,
the underground structure is a square structure, an underground large-caliber well, an underground groove or other structural forms; the square structure is obtained by excavating polluted soil with a certain depth under the ground, and a microorganism packing layer, a covering layer and a water distribution pipe are laid in a foundation pit formed by excavation. The underground large-diameter well is characterized in that a water well with the diameter larger than 30cm is arranged underground, a microbial packing layer, a covering layer and water distribution pipes are laid in the well, or a special device is adopted to dig out the soil column, and the microbial packing layer, the covering layer and the water distribution pipes are laid at the position of the original soil column. The underground groove is formed by digging a groove underground, and a microorganism packing layer, a covering layer and a water distribution pipe are laid in the groove.
The microbial filler layer is a repairing layer consisting of a water-permeable material, a porous material, a nutrient material and a microbial medicament; the permeable material is composed of one or more of broken stone, coarse sand, fine sand and the like; the nutrient substances are substances containing carbon, nitrogen and phosphorus and the like for promoting the growth of indigenous or functional microorganisms, and the specific components are compounded according to the growth requirements of the microorganisms; the porous material is composed of one or more of zeolite, diatomite, volcanic rock, vermiculite, porous alumina, activated carbon, biomass carbon and the like; the microbial agent mainly comprises microbial flora, biological enzyme and the like, and is added according to the requirement of site pollutant degradation.
The covering layer is a natural organic matter covering layer, and the natural organic matter comprises one or more of leaves, sawdust, crushed straw, rice hulls, wheat bran, bean pulp, vinasse and the like.
The water pumping well is arranged in the downstream direction of the bioreactor, and a water pumping pipe of the water pumping well is connected with the water distribution pipe; the pumping well pumps out polluted underground water, the polluted underground water enters the water distribution pipe through the pumping pipe, and the polluted underground water enters the underground water after being treated by the microbial packing layer to form an underground water loop.
The water distribution pipe is composed of a sieve-opened or perforated PVC pipe or a plastic hose, and is arranged in a horizontal turn-back arrangement or circular concentric arrangement mode according to the shape of the in-situ bioreactor, wherein the inner diameter of the sieve-opened or perforated PVC pipe or the plastic hose is required to be 3-5 cm; three or four lines of slits are uniformly cut along the vertical direction of the long axis of the pipe, the slit width, the slit length and the slit distance are consistent, and the aperture ratio is about 5 percent.
The pumping well 2 is arranged at the downstream direction of the bioreactor 6, and a pumping pipe 8 of the pumping well is connected with a water distribution pipe; the pumping well pumps out polluted underground water, the polluted underground water enters the water distribution pipe through the pumping pipe, and the polluted underground water enters the underground water after being treated by the microbial packing layer to form a circulation loop for treating the underground water; through the continuous treatment, the polluted soil and the groundwater are gradually restored to reach the standard. Wherein, the invention is provided with 1 or a plurality of pumping wells; the water pumping pipe 8 is arranged under the ground, the water pumping pump is a small-flow pump, a peristaltic pump is generally used, and the flow rate of the pump is not more than 10L/min.
The supporting equipment comprises a power supply system and a monitoring well 5, wherein the power supply system is electrically connected with a water pump of the water pumping well, and the power supply system is a wind power supply system 9 or a solar panel power supply system 10; a monitoring well 5 is located between the pumping well 2 and the bioreactor 6 for monitoring the contaminant content of the groundwater.
The in-situ bioreactor is suitable for repairing soil and underground water polluted by chlorine-containing organic matters, petroleum hydrocarbon, hexavalent chromium, nitrate radicals, sulfate radicals and the like; the in situ bioreactor of the present invention is adapted for use with 10-3cm/s is more than soil permeability coefficient is more than 10-7A formation in cm/s; the in situ bioreactor of the present invention can operate stably for 5-10 years.
When the device is used, the polluted underground water pumped by the pumping well 2 enters the biological packing layer through the water distribution pipe of the bioreactor 6, is degraded or detoxified by microorganisms in the biological packing layer, the underground water reaching the standard is infiltrated to the underground, and nutrient substances for promoting the production of the microorganisms can be brought into the underground in the infiltration process, so that the contact between the microorganisms and pollutants is improved, the transmission of the nutrient substances is facilitated, and the repair efficiency is improved.
Example 1:
in a hexavalent chromium polluted site, underground water is 3m below the ground, the content of hexavalent chromium in the underground water is 2mg/L, and the soil permeability coefficient of the site is 3 multiplied by 10-6cm/s。
As shown in fig. 1 and 2, the present invention provides an in situ bioreactor based on groundwater circulation: a site underground water level line 1 is positioned 3m underground, soil 3 with a certain depth (3.5m) and area (10m multiplied by 20m) below the ground 7 is excavated, and crushed stone, coarse sand, zeolite, vermiculite, biomass carbon, microbial agents (sulfate reducing bacteria fixed on corncob scraps) and covering materials (crushed corn straws) are filled into the excavated foundation pit to form a square bioreactor 6; the pumping well 2 is positioned 10m at the downstream of the in-situ bioreactor, a pumping well screen pipe is arranged below the groundwater level 1, the bottom of the pumping well is positioned at the position of +/-0.5 m at the downstream edge of the pollution plume 4, and 2 pumping wells (the well spacing is 10m) are arranged in total; pumping water in a pumping well by a peristaltic pump (with the flow rate of 16-20L/min), slowly flowing the pumped water into a water distribution pipe in the in-situ underground water reactor through a pumping pipe 8 (for 13-15 days) through a packing layer, and then infiltrating back to the underground; the monitoring well 5 is arranged between the in-situ bioreactor 6 and the pumping well 2 and is 3m away from the pumping well; and a wind energy power supply system 9 or a solar panel power supply system 10 is adopted to supply power to the water suction pump.
After the system runs for 3 months, the content of hexavalent chromium in the monitoring well is reduced to 1.6 mg/L; after 6 months, the content of hexavalent chromium in the monitoring well is reduced to 0.96 mg/L. The in-situ bioreactor system has obvious reduction effect on hexavalent chromium.
Example 2:
in a site polluted by organic substances, the underground water is 2.5m below the ground, the chlorobenzene content in the underground water is 32.6mg/L, and the soil permeability coefficient of the site is 1 multiplied by 10-6cm/s。
As shown in fig. 3, the present invention provides an in situ bioreactor based on groundwater circulation: a site underground water level line 1 is located 2.5m underground, a well with the outer diameter of 50cm and the inner diameter of 35cm is constructed under the ground 6, crushed stone, coarse sand, zeolite, vermiculite, biomass carbon, scrap iron, rice hulls with the thickness of 2m are added into the well, and a liquid dechlorination microbial inoculum is poured into the rice hulls to form a cylindrical bioreactor 6; the pumping well 2 is positioned 6m downstream of the in-situ bioreactor, the pumping well sieve tube is arranged below the groundwater level 1, and the bottom of the pumping well is positioned at the position of +/-0.5 m of the downstream edge of the pollution plume 4; pumping water in a pumping well by a peristaltic pump (with the flow rate of 5-8L/min), slowly flowing the pumped water into a water distribution pipe in the in-situ cylindrical underground water reactor through a pumping pipe 8 (20-30 days later) through a packing layer, and then infiltrating underground; the monitoring well 5 is arranged between the in-situ bioreactor 6 and the pumping well 3 and is 2m away from the pumping well; and a wind energy power supply system 9 or a solar panel power supply system 10 is adopted to supply power to the water suction pump.
After the system runs for 1 month, the content of chlorobenzene in the monitoring well is not obviously changed; after 3 months, the content of chlorobenzene in the monitoring well is reduced to 28.2 mg/L; after 6 months, the chlorobenzene content in the monitoring well is reduced to 23.4mg/L, and the chlorobenzene degradation effect of the in-situ bioreactor system is remarkable.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An in situ bioreactor based on groundwater circulation, comprising:
the bioreactor is arranged underground and excavated to polluted feather, and comprises an underground structure, wherein a microorganism packing layer, a covering layer and a water distribution pipe are arranged in the underground structure from bottom to top;
the water pumping well is arranged in the downstream direction of the bioreactor, and a water pumping pipe of the water pumping well is connected with the water distribution pipe; the pumping well pumps out polluted underground water, the polluted underground water enters the water distribution pipe through the pumping pipe, and the polluted underground water enters the underground water after being treated by the microbial packing layer to form an underground water loop.
2. The in situ bioreactor of claim 1, wherein the underground structure is a square structure, an underground heavy caliber well or an underground trench.
3. The in situ bioreactor of claim 1, wherein the layer of microbial packing is a remediation layer comprised of a water permeable material, a porous material, a nutrient material, and a microbial agent.
4. The in situ bioreactor of claim 3, wherein the water permeable material comprises one or more of crushed stone, coarse sand, fine sand;
the porous material comprises one or more of zeolite, diatomite, volcanic rock, vermiculite, porous alumina, activated carbon and biomass carbon.
5. The in situ bioreactor of claim 3, wherein the nutrient material is a carbon-containing and/or nitrogen-containing and/or phosphorus-containing substance that promotes the growth of indigenous or functional microorganisms;
the microbial agent is microbial flora and/or biological enzyme.
6. The in situ bioreactor of claim 1, wherein the blanket is a natural organic matter blanket.
7. The in situ bioreactor of claim 1, wherein the water distribution tubes are made of perforated or perforated PVC or plastic hose.
8. The in situ bioreactor of claim 1, further comprising a power supply system;
and the power supply system is electrically connected with a water suction pump of the water suction well.
9. The in situ bioreactor of claim 8, wherein the power supply system is a wind power supply system or a solar panel power supply system.
10. The in situ bioreactor of claim 1, further comprising a monitoring well;
the monitoring well is positioned between the pumping well and the bioreactor and is used for monitoring the pollutant content of underground water.
CN201911167365.2A 2019-11-25 2019-11-25 In-situ bioreactor based on underground water circulation Pending CN110947745A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111744943A (en) * 2020-06-18 2020-10-09 湖南恒凯环保科技投资有限公司 Large-diameter medicament injection well and in-situ remediation equipment and process for organic matter polluted groundwater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111744943A (en) * 2020-06-18 2020-10-09 湖南恒凯环保科技投资有限公司 Large-diameter medicament injection well and in-situ remediation equipment and process for organic matter polluted groundwater
CN111744943B (en) * 2020-06-18 2021-09-10 湖南恒凯环保科技投资有限公司 Large-diameter medicament injection well and in-situ remediation equipment and process for organic matter polluted groundwater

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