CN109775862B - Permeable reaction wall and in-situ bioremediation method for groundwater pollution - Google Patents
Permeable reaction wall and in-situ bioremediation method for groundwater pollution Download PDFInfo
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Abstract
A permeable reaction wall: the repairing well is arranged in the underground water reaction main well, the repairing well comprises a water pumping well and an aeration well, an aeration pipe is arranged in the aeration well, the aeration pipe is connected with an air compressor on the ground, the aeration pipe is arranged at the bottom of the center of the repairing well, an automatic sample collecting device is arranged in the aeration well, and a filter material is filled between the repairing well and the underground water reaction main well; the permeable reaction processing unit comprises a plurality of reaction unit components with sandwich structures, a positioning connecting groove is arranged between every two adjacent reaction units, the connected reaction units are placed in the repair well pipe, and mixed biological fillers are loaded in the sandwich space of the reaction units; a water quality analysis probe is arranged in the permeable reaction unit; the two-wing impervious walls are arranged on the two side wings of the restoration well, and the operation longitudinal depth of the two-wing impervious walls penetrates through the first submerged aquifer; the effluent monitoring pool is arranged below the ground, and a water quality and water level automatic monitoring system is arranged in the effluent monitoring pool; the automatic control system adopts a PLC control system.
Description
Technical Field
The invention belongs to the field of groundwater remediation, and particularly relates to an intermittent aeration funnel door type permeable reaction wall (PRB).
The invention also relates to a method for carrying out in-situ bioremediation on the sewage pollution of the refuse landfill site by utilizing the PRB.
Background
At present, the main disposal modes of industrial solid wastes basically adopt modes such as landfill, stockpiling, tailing pond and the like. Landfill is a method for treating solid pollutants by burying solid wastes underground or stacking the solid wastes on the ground, and can be classified into simple or sanitary landfill sites according to whether the seepage-proofing measures of the landfill sites are sound or not. The contradiction between the land used by the landfill site which is accumulated and stocked for a long time and the valuable urban development land resource and ecological space is increasingly prominent. As the landfill time increases, the risks of damage to the impermeable layer of the landfill and leakage of percolate increase. Heavy metals and organic pollutants in the leachate pose serious threats to the soil groundwater environment.
With the development of the technology, people make great progress in the aspect of groundwater pollution remediation, and a relatively complete groundwater remediation technology system and related standard guidelines are gradually formed, wherein the content comprises a determination method of groundwater remediation targets, a workflow of groundwater remediation, research and engineering application of groundwater remediation technology and the like. Permeable Reactive Barrier (PRB) is used as an in-situ groundwater pollution remediation technology, can be effectively operated for a long time, has small disturbance to groundwater environment and low operation and maintenance cost, and has wide application prospect.
Disclosure of Invention
The invention aims to provide an intermittent aeration funnel door type permeable reaction wall.
The invention also aims to provide a method for carrying out in-situ bioremediation on the water pollution of the refuse landfill site by utilizing the PRB.
In order to achieve the purpose, the permeable reaction wall provided by the invention is an intermittent aeration funnel door type permeable reaction wall (PRB), and comprises a groundwater reaction main well, a repair well, a permeable reaction processing unit, two-wing impervious walls, a water outlet monitoring pool and an automatic control system; wherein:
the repairing well is arranged in the underground water reaction main well, the repairing well comprises a water pumping well and an aeration well, an aeration pipe is arranged in the aeration well, the aeration pipe is arranged at the bottom of the center of the repairing well, an automatic sample collecting device is arranged in the aeration well, and a filter material is filled between the repairing well and the underground water reaction main well; the aeration pipe is connected with an air compressor on the ground and is controlled by an automatic aeration system;
the permeable reaction processing unit comprises a plurality of reaction unit components with sandwich structures, a positioning connecting groove is arranged between every two adjacent reaction units, the connected reaction units are placed in the repair well pipe, and mixed biological fillers are loaded in the sandwich space of the reaction units; a water quality analysis probe is arranged in the permeable reaction unit;
the two-wing impervious walls are arranged on the two side wings of the restoration well, and the operation longitudinal depth of the two-wing impervious walls penetrates through the first layer of diving aquifer to reach the position below the waterproof bottom plate;
the effluent monitoring pool is arranged below the ground, and a water quality and water level automatic monitoring system consisting of a lift pump, a flowmeter and a comprehensive instrument is arranged in the effluent monitoring pool;
the automatic control system adopts a PLC control system and comprises a PLC main cabinet and a remote I/O control cabinet.
The permeable reaction wall is characterized in that the underground water reaction main well is a concrete sleeve, a plurality of water inlets and a water outlet are formed in the concrete sleeve, and the water outlet is connected with the water outlet monitoring pool.
The permeable reaction wall is characterized in that a filter material filled between the underground water reaction main well and the repair well is as follows: the bottom is filled with fine quartz sand with the grain diameter of 3mm, and the rest height is filled with broken stones with the grain diameter of 3 cm.
The permeable reaction wall is characterized in that the mixed biological filler in the reaction unit is a mixture of hematite, zeolite and a starch binder; wherein the hematite is primary hematite, the zeolite is natural zeolite, and the particle size of the zeolite is 3-5 cm; the starch is amylopectin prepared from waxy corn and has the particle size of 15-100 mu m, the amylopectin is subjected to causticization pretreatment by NaOH until the pH value is 10-11, the amylopectin is vibrated, stirred and dried, then the starch is adhered to the surface of the hematite to form a starch-hematite chelate, and the starch-hematite chelate and zeolite are uniformly filled according to the volume ratio of 1:1 to form the mixed biological filler.
The permeable reaction wall is characterized in that the mixed biological filler is subjected to biofilm formation by using indigenous Fe (III) reducing functional microorganisms, bacteria liquid is emptied, and the mixed biological filler is washed to remove redundant culture medium nutrients on the surface of a solid phase.
The permeable reaction wall is characterized in that functional microorganisms are cultured by taking paddy field soil as a culture source, and the microbial community structure comprises iron reducing bacteria and heterotrophic denitrifying bacteria.
The permeable reaction wall is characterized in that the impervious walls on the two wings are single-shaft stirring pile concrete type water interception curtains or high-density polyethylene flexible impervious film water interception curtains.
The invention provides a method for in-situ bioremediation of underground water pollution of a refuse landfill site by utilizing the permeable reaction wall, which comprises the following steps:
the two-wing cutoff walls separate the underground water pollution feather and enable the underground water pollution feather to converge into an underground water reaction main well, the underground water pollution feather is treated through the permeable reaction walls, the treated underground water enters the effluent monitoring pool, and if effluent meets the relevant underground water standard, the effluent overflows to a downstream aquifer; if the water is not up to standard, the water is recharged to the front end groundwater reaction well for circular treatment.
The method comprises the following steps of treating the groundwater pollution plume by the permeable reactive barrier:
an air compressor is closed through an automatic control system, the anaerobic reaction condition of underground water is kept, hematite Fe (III) is biologically reduced into Fe (II) by iron reducing bacteria, organic matters are oxidized into bicarbonate radicals and carbon dioxide, and part of ammonia nitrogen is anaerobically oxidized into nitrite; meanwhile, the mixed biological filler has an adsorption effect on pollutants;
an air compressor is started through an automatic control system, an aerobic condition of an underground water environment is created, uniform distribution of heterogeneous pollutants in a reaction unit assembly is realized, Fe (II) is partially oxidized into Fe (III) under the aerobic condition, part of Fe (II) is adsorbed by zeolite-hematite, nitrite is partially oxidized into nitrate, and ammonia nitrogen is oxidized into nitrate and nitrite;
the air compressor is closed through an automatic control system, so that underground water enters an anaerobic condition, Fe (III) is continuously reduced into Fe (II), and organic matters and ammonia nitrogen are continuously oxidized; nitrate and nitrite pollutants in the system are converted into nitrogen under the action of denitrifying bacteria functional microorganisms, namely, the aeration of an air compressor is automatically controlled, an intermittent anaerobic-aerobic environment is created, and the synchronous removal of the carbon and nitrogen pollutants is realized.
The invention has the following advantages:
the intermittent aeration funnel door type PRB refuse landfill site groundwater pollution in-situ bioremediation process is disclosed, economic, efficient and safe hematite-starch-zeolite mixed biological filler is adopted to load functional microorganisms such as indigenous iron reducing bacteria and denitrifying bacteria, the Fe (III) biological reduction process in a natural aquifer is strengthened, the synchronous treatment of characteristic pollutants, namely ammonia nitrogen and organic matters, of the landfill site groundwater is realized, the engineering problem of PRB reaction medium replacement and maintenance is broken through, the treated groundwater is collected in a powerless natural overflow mode, and automatic hydraulic regulation and control are carried out.
Drawings
FIG. 1 is a schematic structural view of a gate-type permeable reaction wall of an intermittent aeration funnel according to the present invention.
Fig. 2 is a top view of an intermittent aeration funnel door type permeable reaction wall.
FIG. 3 is a water inlet end view of a permeable reaction processing unit.
FIG. 4 is an end view of the permeable reaction processing unit in water outlet.
Description of the figures
Groundwater reaction main shaft 1, intermittent type nature aeration funnel gate-type PRB restoration well 2, sample automatic acquisition device 3, permeable reaction processing unit 4, connecting pipe valve 5, go out water monitoring pond 6, elevator pump 7, mixed biofilm carrier 8, mixed biofilm carrier fills district 9, sieve mesh 10, air compressor machine 11.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
As shown in fig. 1 and 2, the intermittent aeration funnel door type permeable reaction wall of the present invention comprises:
the system comprises a groundwater reaction main well 1, an intermittent aeration funnel-door type PRB repair well 2, a permeable reaction processing unit 4, two-wing impervious walls, a water outlet monitoring pool 6, equipment, instruments, an automatic control system and the like; wherein:
in groundwater reaction main shaft 1 was arranged in to intermittent type nature aeration funnel gate-type PRB restoration well 2, contained central aeration pipe in the intermittent type nature aeration funnel gate-type PRB restoration well, installed in restoration well center bottom, aeration union coupling to the air compressor machine 11 on ground. The outermost underground water reaction main well (finished well) of the repair well is a concrete pipe with the diameter of 2 meters, the finished well inside the repair well is a High Density Polyethylene (HDPE) pipe with the diameter of 1 meter, and a space between the HDPE pipe with the diameter of 1 meter and the concrete pipe with the diameter of 2 meters is filled with a filter material (crushed stone with the particle size of 3-5 cm).
The underground water reaction main well is provided with 208 water inlet holes with the diameter of 2 meters, the position of the hole is 5m from the bottom upwards (assuming that the height of the first layer of the submerged water-containing layer is 15 meters, the same is true below, the bottom is-15.0 m to-10.0 m, and the front end of the water inlet is provided with the hole); the aperture of the water inlet is 5 cm; the interval is that every 20 jiaos of division is a water inlet, totally 8 rows, and every row of water inlet interval is 20cm, 26 water inlet of every row. In addition, the top of the rear end of the water outlet is downward at 2.0m, 1 hole is formed, the aperture is 20cm, and the water outlet monitoring pond is used for being matched with a connecting pipe to connect a PE pipe and a concrete pipe to a water outlet monitoring pond 6, and the connecting pipe is provided with a valve 5.
Repairing HDPE pipes with the diameter of 1 m in the well, wherein 208 holes are formed in the HDPE pipes with the inner part of the well, and the hole positions are 5m upwards from the bottom (the bottom is 15.0m to 10.0m, and the front end of the water inlet is provided with holes); the aperture is 3 cm; the interval is that every 20 degrees angle opens a row of holes, totally 8 rows; the holes in each row are spaced 20cm apart, and the holes in each row are 26. In addition, the top of the rear end of the water outlet is downward at the position of-2.0 m, 1 hole is formed, the aperture is 10cm, and the water outlet monitoring pond is used for being matched with a connecting pipe to connect a PE pipe and a concrete pipe to the water outlet monitoring pond, and the connecting pipe is provided with a valve.
1 m HDPE well pipe of intermittent aeration funnel gate type PRB restoration well and 2m concrete pipe space of underground water reaction main well are filled with filter materials, the filling rule is that fine quartz sand with the grain diameter of about 3mm is filled at the bottom of-15.0 m to-10.0 m, and broken stones with the grain diameter of 3cm are filled at the rest height, so that the sediment of a water-bearing layer is blocked, and the well pipe is prevented from being blocked.
The permeable reaction processing unit 4 is made of S316L stainless steel and comprises 15 small reaction unit components. The water inlet end of each reaction unit is provided with a sieve hole 10, and the top of the water outlet end is also provided with a sieve hole 10 (see fig. 3 and 4). And a positioning connecting groove is arranged between every two adjacent reaction units, and the reaction units can be hoisted to the underground section by section through hoisting equipment on the ground, so that the loading of the filler is completed. The whole reaction unit is placed in an HDPE well pipe with the diameter of 1 meter of an intermittent aeration funnel-door type PRB repair well, the height of the whole design size is 15 meters, the outer diameter of a single small-sized reaction unit component is 85cm, the inner diameter is 27.3cm, and the mixed biological filler 8 is loaded in a mixed biological filler filling area 9 in the inner and outer diameter space.
The permeable reaction processing unit of the invention uses mixed biological filler of hematite, zeolite and starch adhesive inside. The hematite is primary hematite, the zeolite is natural zeolite, and the particle size of the zeolite is 3-5 cm; the starch is amylopectin prepared from waxy corn with a particle size of 15-100um, the starch is adhered to the surface of hematite through the steps of NaOH causticization pretreatment (pH is 10-11), shaking, stirring, airing and the like to form a starch-hematite chelate, and then the starch-hematite chelate and zeolite are uniformly filled according to a volume ratio of 1:1 to form a mixed biological filler, wherein the permeability coefficient of the mixed biological filler is (1.87-5.52) multiplied by 103cm·d-1Is 10 of the permeability coefficient of the field diving aquifer medium8Thereby effectively avoiding the phenomenon that the reaction filler blocks the reactor, and the density of the mixed biological filler is 1.7-2.2t/m3. And (3) carrying out biofilm formation on the mixed biological filler by using indigenous Fe (III) reducing functional microorganisms for 72 hours, then emptying bacteria liquid, and washing the reaction filler by using normal saline to remove redundant culture medium nutrients on the surface of the solid phase. The reaction filler is arranged in the permeable reaction processing unit section by section, a positioning groove is arranged between the adjacent reaction units, and the reaction units can be hoisted to the ground section by section through the hoisting equipment on the ground, so that the replacement of the filler is completed.
The engineering bacteria inoculation load operation process comprises the following steps: the functional microorganism is cultured by adopting paddy soil as a culture source, and the formula of a liquid culture medium is as follows: NH (NH)4Cl(0.535g/L)，KH2PO4(0.136g/L)，MgCl2·6H2O(0.204g/L)，CaCl2·2H2O(0.147g/L)，NaHCO3(2.52g/L)，CH3COONa (0.82g/L), ferric citrate (0.735g/L), a mixed solution of trace elements (10mL/L) and a mixed solution of vitamins (10 mL/L). Its microbial floraThe colony structure mainly comprises iron reducing bacteria (main functional strains are Geobacter sulfuridunens and Shewanella spp.), heterotrophic denitrifying bacteria and the like. The method comprises the following steps of inoculating and loading microorganisms to the surface of the mixed biological filler by adopting an immersion film hanging method, wherein the specific process comprises the following steps: firstly, putting a certain mass of mixed biological filler into a closed container, injecting engineering bacteria liquid, and enabling the liquid level of the bacteria liquid to be 10cm higher than the filling height of the mixed biological filler; then, culturing at the constant temperature of 35 ℃ until the concentration of ammonia nitrogen and COD in the system is obviously reduced and the reduction amount of ferric iron is obviously increased, namely, indicating that the biological membrane is successfully loaded on the surface of hematite, and then emptying the engineering bacteria liquid; finally, after soaking the biofilm-laden hematite with a 0.85% NaCl solution (normal saline) for 30min, the normal saline was drained. After repeating the process for 2-3 times, the mixed biological filler loaded with the biological membrane is filled into the permeable reaction processing unit.
The two-wing impervious wall can adopt a single-shaft stirring pile concrete type water interception curtain and also can adopt a HDPE flexible impervious film water interception curtain. The concrete type water interception curtain of the single-shaft mixing pile adopts concrete as a main agent of a curing agent, the concrete is sprayed into a soil body by using the mixing pile machine and is fully mixed, so that a series of physical and chemical reactions occur between cement and the soil, soft soil is hardened, and the purpose of water interception is achieved, and the operation longitudinal depth is required to penetrate through a first layer of submerged aquifer and reach at least 0.5 meter below a water-proof bottom plate. The specific specifications of the flexible impermeable membrane are HDPE double-rough-surface geomembrane with the thickness of 2.0mm and bentonite with the thickness of 6mm, and the dimensions of the single-wing HDPE geomembrane are 10m long and 15.5m wide. A first weak permeable layer and the like existing below a foundation are utilized, a vertical (HDPE (high-density polyethylene) film, bentonite and clay layer) combined impervious wall is arranged at a construction point in the south of a landfill, a pumping well is additionally arranged to form negative pressure with underground water, and the underground water is effectively prevented from passing through. The ground of the guide wall should enter the soil body of the first layer of the weak permeable layer by more than 200mm, and the outer side of the guide wall is filled with clay. And supposing support between the guide walls immediately after the form removal, wherein the horizontal distance of the support is 1.5m, and the support is arranged one above the other. The support can be replaced by 10 x 10cm square timber or angle steel, and when unfavorable geology is met, the soil body is reinforced or a deep guide wall is adopted.
The water outlet monitoring pool 6 is built on the groundThe depth below the surface is 3m, and the total size is 5m long, 2m wide and 3m high. The effluent monitoring pool is internally provided with a lift pump 7, a flowmeter (a floating ball liquid level meter, the measurement range is 0-2.5 meters) and a comprehensive instrument. Wherein the comprehensive instrument is a water quality analysis probe NH4 +N, pH, EC, DO, ORP, T, water level, etc. And (3) after the polluted underground water is treated by the biochemical reaction unit, the polluted underground water enters a rear-end water outlet monitoring pool in a natural overflow mode, if the water quality does not meet the relevant underground water standard, the polluted underground water is recharged to the underground water reaction main well for circular treatment, and if the water quality meets the water outlet standard, the polluted underground water overflows to a downstream aquifer.
The apparatus and instruments involved in the invention comprise a digital NH4 +The system comprises an on-line analysis probe, a pH electrode, a dissolved oxygen/temperature sensor, an ORP sensor, a conductivity sensor, a drop-in liquid level transmitter, a four-channel peristaltic pump (comprising a pump head), a peristaltic pump RS485 external control module, a stainless steel anti-floating countersunk head special for a peristaltic pump silica gel hose, a piston type air compressor (tiny oil), an oil-water separator, a submersible lift pump (matched with an automatic coupling system), an electric butterfly valve, a groundwater remediation system local PLC control cabinet and a wireless industrial router.
The invention relates to a water quality and water level automatic monitoring system, which comprises: a biochemical treatment reaction unit water quality automatic monitoring system and an effluent monitoring pool water quality and water level automatic monitoring system. The biochemical treatment reaction unit is internally provided with a conventional water quality analysis probe which can monitor NH at different depths of the reaction unit on line4 +N, DO, EC, ORP, T, pH, water level. In addition, an automatic sample acquisition device 3 is arranged in the aeration well, so that automatic acquisition and ground storage of samples at multiple layers are realized; the automatic water level monitoring assembly is installed in the effluent monitoring pool, automatic water level control of the effluent monitoring pool can be achieved, when the water level of the effluent monitoring pool is greater than 0.3m of the water head difference in the reaction unit, the electric butterfly valve is opened, and the treated underground water automatically overflows into the effluent monitoring pool through the water outlet of the reaction unit. When the difference between the water level of the effluent monitoring pool and the water head in the reaction unit is less than 0.3m, the electric butterfly valve is closed, and the lift pump in the effluent monitoring pool is started. If the water quality of the effluent monitoring pool reaches the standard, an electric butterfly valve is opened to lift and overflow the water in the effluent monitoring pool to the downstreamA water layer; and if the water quality of the effluent monitoring pool does not reach the standard, starting an electric butterfly valve to lift the water in the effluent monitoring pool to a front-end main reaction well. The automatic aeration system can automatically control the air compressor on the ground, thereby realizing the automatic control of the aeration time and the aeration flow in the biochemical treatment unit.
The automatic control system adopts a PLC control system and comprises a PLC main cabinet, a remote I/O control cabinet and the like. The remote control and the local control can be realized. The remote control mode is as follows: the working mode selection switch on the control panel of the electrical cabinet is placed in a remote state, and the corresponding equipment can be started by pressing a system starting button in a control room. The local control mode is as follows: the working mode selection switch on the control panel of the electrical cabinet is placed in a local state, all equipment needs to be started and stopped by corresponding operation switches, and the mode is used for ordinary maintenance and overhaul. Various field equipment instruments are sent into the PLC control cabinet through RS485 data transmission lines and 4-20mA standard signals or switching signals, and data acquisition is completed by adding an expansion module or upper computer interface software according to different field conditions. Each monitoring point performs remote data transmission and remote control with a central terminal system in a wireless transmission mode (GPRS/GSM/CDMA), and all data acquisition and uploading support breakpoint continuous transmission.
The invention strengthens the biological reduction process of natural Fe (III), uses hematite-starch-zeolite mixed filler as a funnel-gate PRB reaction medium (the permeability coefficient is 1.87 multiplied by 10)3cm·d-1～5.52×103cm·d-1) Inoculating Fe (III) reduction engineering bacteria for strengthening enrichment of paddy field soil microorganisms, synchronously realizing degradation and biological denitrification of organic matters through intermittent aeration, and treating the polluted underground water of the landfill. The underground water treated by the PRB reaction treatment unit enters a water outlet monitoring pool, and if the outlet water reaches the standard, the outlet water overflows to a downstream aquifer; and if the standard is not met, recharging to the PRB main well for circular treatment. The invention can adopt a single-shaft mixing pile concrete type water interception curtain or HDPE film flexible seepage prevention technology to effectively intercept underground water pollution feathers in engineering, uses a rotary drilling rig to dig a well (also can dig manually, and needs to add a dewatering well), and pours a concrete foundation, thereby ensuring that a foundation at the bottom of a main well can be repaired within many yearsHorizontal and not easy to generate sedimentation. Positioning pins are arranged between every two adjacent stages of reaction units, so that the single reaction unit can be hoisted, loaded and unloaded step by step, and repeated replacement of mixed reaction fillers in the reaction well is guaranteed.
The invention is suitable for the field of underground water environment protection, is suitable for treating underground water pollution of a landfill site with shallow underground water burial depth and low permeability medium, and treats pollutants mainly comprising organic matters (phthalate), ammonia nitrogen, nitrate and nitrite.
The working principle of the in-situ bioremediation method for the sewage pollution of the intermittent aeration funnel-door type PRB refuse landfill site is as follows: aiming at characteristic pollutants such as ammonia nitrogen and organic matters (2-ethylhexyl phthalate) in underground water of a refuse landfill, an intermittent aeration funnel door type PRB (reactive resource block) underground water pollution in-situ bioremediation process is adopted, a single-shaft stirring pile concrete type water interception curtain is adopted for two-wing impervious walls, the length of a single side is 30 meters, the total length of two wings is 60 meters, and an included angle of 130 degrees is formed, so that underground water pollution plumes are intercepted and converged into an underground water reaction main well; the mixed biological filler in PRB reaction treatment unit uses granular hematite-zeolite-starch chelate after loading microorganism to treat underground water pollution. Before filling, the mixed filler is soaked and filmed by using a microbial liquid, and the indigenous microbes are iron reduction engineering strains for performing flooding culture on paddy soil. The underground water treated by the PRB reaction unit enters a monitoring pool, and overflows to a downstream aquifer if the effluent meets the relevant underground water standard; if the water is not up to standard, the water is recharged to the front end groundwater reaction well for circular treatment.
The filling volume ratio of the hematite to the zeolite is 1:1, the pH value of the starch pretreatment is 11, the stirring speed is 20r/min, the solid stirring is carried out for 48 hours, the loading mass ratio of the starch to the hematite is 10kg/t, and the permeability coefficient of the mixed filling medium is 1.87 multiplied by 103cm·d-1～5.52×103cm·d-1。
The aerator is closed through an automatic control system, the anaerobic reaction condition of underground water is kept, hematite Fe (III) is biologically reduced into Fe (II) by iron reducing bacteria, organic matters are oxidized into bicarbonate radicals and carbon dioxide, and part of ammonia nitrogen is anaerobically oxidized into nitrite; meanwhile, the hematite-zeolite-starch mixed biological filler also has a certain adsorption effect on the pollutants;
opening an air compression aerator through an automatic control system, setting aeration time to be 2h/d, creating an aerobic condition of underground water environment, realizing uniform distribution of heterogeneous pollutants in a reaction unit, wherein Fe (II) is partially oxidized into Fe (III) under the aerobic condition, part of Fe (II) is adsorbed by zeolite-hematite, nitrite is partially oxidized into nitrate, and ammonia nitrogen is oxidized into nitrate and nitrite;
the aerator is closed through an automatic control system, so that underground water enters an anaerobic condition, Fe (III) is continuously reduced into Fe (II), and organic matters and ammonia nitrogen are continuously oxidized; pollutants such as nitrate, nitrite and the like in the system are converted into nitrogen under the action of the denitrifying bacteria functional microorganisms, namely, the air compressor aerator is automatically controlled to create an intermittent anaerobic-aerobic environment, so that the synchronous removal of carbon and nitrogen pollutants is realized.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A permeable reaction wall comprises a groundwater reaction main well, a repair well, a permeable reaction processing unit, two-wing impervious walls, a water outlet monitoring pool and an automatic control system; the method is characterized in that:
the repairing well is arranged in the underground water reaction main well, the repairing well comprises a water pumping well and an aeration well, an aeration pipe is arranged in the aeration well, the aeration pipe is arranged at the bottom of the center of the repairing well, an automatic sample collecting device is arranged in the aeration well, and a filter material is filled between the repairing well and the underground water reaction main well; the aeration pipe is connected with an air compressor on the ground and is controlled by an automatic aeration system;
the permeable reaction processing unit comprises a plurality of reaction unit components with sandwich structures, a positioning connecting groove is arranged between every two adjacent reaction units, the connected reaction units are placed in the repair well pipe, and mixed biological fillers are loaded in the sandwich space of the reaction units; a water quality analysis probe is arranged in the permeable reaction unit; the permeable reaction processing unit is made of S316L stainless steel;
the two-wing impervious walls are arranged on the two side wings of the restoration well, and the operation longitudinal depth of the two-wing impervious walls penetrates through the first layer of diving aquifer to reach the position below the waterproof bottom plate;
the effluent monitoring pool is arranged below the ground, and a water quality and water level automatic monitoring system consisting of a lift pump, a flowmeter and a comprehensive instrument is arranged in the effluent monitoring pool;
the automatic control system adopts a PLC control system and comprises a PLC main cabinet and a remote I/O control cabinet.
2. The permeable reaction wall of claim 1, wherein the underground water reaction main well is a concrete casing, the concrete casing is provided with a plurality of water inlets and a water outlet, and the water outlet is connected to the water outlet monitoring pool.
3. The permeable reactive barrier of claim 1, wherein the filter material filled between the groundwater reaction main well and the remediation well is: the bottom is filled with fine quartz sand with the grain diameter of 3mm, and the rest height is filled with broken stones with the grain diameter of 3 cm.
4. The permeable reaction wall of claim 1, wherein the mixed biological filler in the reaction unit is a mixture of hematite, zeolite, starch binder; wherein the hematite is primary hematite, the zeolite is natural zeolite, and the particle size of the zeolite is 3-5 cm; the starch is amylopectin prepared from waxy corn and has the particle size of 15-100 mu m, the amylopectin is subjected to causticization pretreatment by NaOH until the pH value is 10-11, the amylopectin is vibrated, stirred and dried, then the starch is adhered to the surface of the hematite to form a starch-hematite chelate, and the starch-hematite chelate and zeolite are uniformly filled according to the volume ratio of 1:1 to form the mixed biological filler.
5. The permeable reactive barrier of claim 4, wherein the mixed biological filler is coated with indigenous trivalent iron reducing microorganisms, and the bacteria solution is emptied and washed to remove excess culture medium nutrients on the solid surface.
6. The permeable reactive barrier of claim 5, wherein the functional microorganisms are cultured using paddy soil as a culture source, and the microbial community structure comprises iron-reducing bacteria and heterotrophic denitrifying bacteria.
7. The permeable reactive wall of claim 1, wherein the two-wing cutoff wall is a uniaxial mixing pile concrete cutoff curtain or a high density polyethylene flexible impermeable film cutoff curtain.
8. A method for in situ bioremediation of landfill site water contamination using the permeable reaction wall of claim 1, wherein:
the two-wing cutoff walls separate the underground water pollution feather and enable the underground water pollution feather to converge into an underground water reaction main well, the underground water pollution feather is treated through the permeable reaction walls, the treated underground water enters the effluent monitoring pool, and if effluent meets the relevant underground water standard, the effluent overflows to a downstream aquifer; if the water is not up to standard, the water is recharged to the front end groundwater reaction well for circular treatment.
9. The method of claim 8, wherein the treatment of the groundwater pollution plume by the permeable reactive wall is:
an air compressor is closed through an automatic control system, the anaerobic reaction condition of underground water is kept, hematite ferric iron is biologically reduced into ferrous iron by iron reducing bacteria, organic matters are oxidized into bicarbonate radicals and carbon dioxide, and part of ammonia nitrogen is anaerobically oxidized into nitrite; meanwhile, the mixed biological filler has an adsorption effect on pollutants;
an air compressor is started through an automatic control system, an aerobic condition of an underground water environment is created, uniform distribution of heterogeneous pollutants in a reaction unit assembly is achieved, ferrous iron is partially oxidized into ferric iron under the aerobic condition, part of ferrous iron is adsorbed by zeolite-hematite, nitrite is partially oxidized into nitrate, and ammonia nitrogen is oxidized into nitrate and nitrite;
the air compressor is closed through an automatic control system, so that underground water enters an anaerobic condition, ferric iron is continuously reduced into ferrous iron, and organic matters and ammonia nitrogen are continuously oxidized; nitrate and nitrite pollutants in the system are converted into nitrogen under the action of denitrifying bacteria functional microorganisms, namely, the aeration of an air compressor is automatically controlled, an intermittent anaerobic-aerobic environment is created, and the synchronous removal of the carbon and nitrogen pollutants is realized.
Priority Applications (1)
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