Mobile indigenous bacterium restoration and treatment coupling equipment

Abstract

The utility model discloses mobile indigenous bacterium restoration and treatment coupling equipment which comprises a microorganism culture system, a high-pressure jet grouting injection system, an extraction and recovery system, a temperature control system, a protection monitoring system and the like. According to the utility model, a systematic integral remediation technology is adopted, the process measure is economical and feasible, the construction period is shorter, the environmental influence is small, the operability is strong, the invasion of external strains and the risk of secondary pollution are avoided, and the device is a movable, efficient and reproducible microbial ecological remediation device for polluted soil and underground water. The device can be used for solving the problems in the aspects of site repair project technical methods, repair efficiency, construction cost and the like, and finally the concentration of organic pollutants in a site is rapidly reduced to be below a repair target value. The device has the advantages of being simple in structure, convenient to use and capable of efficiently repairing contaminated soil and underground water in the low-permeability soil layer of the organic contaminated site.

Description

Technical Field

[0001] The utility model relates to the technical field of contaminated soil and groundwater restoration, in particular to a mobile indigenous bacteria restoration and management coupling device. Background Art

[0002] In the process of urbanization, the industrial structure has been continuously adjusted and optimized, and industrial enterprises mainly engaged in the manufacture of rubber products, paints and coatings, pharmaceutical products, organic pesticides and petroleum products have been relocated to the planned industrial parks one after another.

[0003] Refractory organic pollutants entering the soil environment will change the composition and structure of soil organic matter, increase the carbon content and its proportion in the soil, affect the nutritional composition of the soil, and greatly inhibit the growth and development of crops; at the same time, they will spread into the groundwater environment, forming a pollution plume, affecting drinking water resources and groundwater resources; volatile substances will cause various types of poisoning after volatilization; polycyclic aromatic hydrocarbons are also easily enriched through the food chain and are extremely harmful.

[0004] The technology of microbial remediation of organic-contaminated soil and groundwater is an emerging pollution treatment technology. This technology mainly utilizes indigenous microorganisms in the soil and groundwater in the contaminated site or adds specific microorganisms to degrade organic pollutants into carbon dioxide, water and other harmless substances under certain environmental conditions, thereby repairing the contaminated site.

[0005] SER technology is a chemical and biological combined remediation technology and one of the most promising remediation technologies for organic polluted soil and groundwater. This technology includes two stages: elution and activation of organic pollutants and bio-utilization. In the first stage, the micellization and interfacial adsorption of surfactants are used to increase the apparent solubility or oil-water interfacial tension of hydrophobic organic pollutants, elute the hydrophobic organic pollutants from the soil, and improve their bioavailability. The second stage is the degradation of microorganisms. Since microbial degradation cannot directly utilize adsorbed organic pollutants, the synergistic elution effect of surfactants is the key to this technology.

[0006] High-pressure jet grouting technology uses high-pressure rotary jet equipment (such as rotary jet drills, etc.) to drill a grouting pipe with a nozzle to a predetermined depth in the soil layer and then spray out chemical agents. Under the impact force of the jet flow, centrifugal force, gravity, and hydraulic gradient, the agent and the soil are effectively and evenly mixed and reacted, reducing the concentration of pollutants or converting them into non-toxic or less toxic substances, thereby eliminating the harm of pollutants to the soil and groundwater environment.

[0007] In the actual use of existing injection soil remediation equipment, soil permeability is an important factor that restricts the effect of bioremediation. When there are soil layers with different permeabilities on the site, the mass transfer rate of nutrients and electron acceptors in sandy loam with less viscosity is faster, which is conducive to the degradation of organic pollutants by microorganisms; on the contrary, the soil layer in the lumpy soil with greater viscosity has low permeability, making it more difficult to inject remediation agents. At the same time, the low permeability soil layer will also change the flow direction and distribution of the agent solution, resulting in low agent utilization efficiency and unclear remediation effect, which greatly restricts the use of microbial remediation methods. Utility Model Content

[0008] In order to solve the problems raised in the above-mentioned background technology, the purpose of the utility model is to provide a mobile indigenous bacteria remediation and treatment coupling equipment, which has the advantages of simple structure, easy use, and can efficiently remediate contaminated soil and groundwater in the low permeability soil layer of organic contaminated sites.

[0009] The utility model provides the following technical solutions: a mobile indigenous bacteria restoration and treatment coupling device, including a microbial culture system, a high-pressure rotary jet injection system, an extraction and recovery system, a temperature control system and a protection monitoring system, etc. The microbial culture system includes an indigenous bacteria culture barrel, a nutrient solution configuration barrel, a temporary storage tank, a grouting pump and an online monitoring instrument, etc. The indigenous bacteria culture barrel is connected to the nutrient solution configuration barrel through a pipeline, the indigenous bacteria culture barrel is connected to the temporary storage tank through a pipeline, the water outlet of the grouting pump is connected to the water inlet of the indigenous bacteria culture barrel through a pipeline, and the high-pressure rotary jet injection system includes a high-pressure rotary jet drilling rig, a pharmaceutical solution It is equipped with a barrel, an air compressor and a high-pressure grouting pump, etc. The extraction and recovery system includes an injection well, an extraction well, a vacuum pump, a temporary storage tank and a grouting pump, etc. The water inlet of the vacuum pump extends to the interior of the extraction well through a pipeline, and the water outlet of the vacuum pump is connected to the temporary storage tank through a pipeline. The water outlet of the temporary storage tank is connected to the water inlet of the high-pressure grouting pump through a pipeline. The temperature control system includes an automatic temperature adjustment controller and an electric heating well, etc. The protection and monitoring system includes a drainage ditch, a supporting structure, a water-stop curtain and a monitoring well, etc. The water outlet of the high-pressure grouting pump extends to the interior of the injection well through a pipeline, and the water outlet of the vacuum pump is connected to a valve.

[0010] The beneficial effects of the utility model are as follows: The utility model adopts system overall remediation technology, the process measures are economical and feasible, the construction period is short, the environmental impact is small, the operability is strong, there is no invasion of foreign bacteria and the risk of secondary pollution, and it is a mobile, efficient and replicable contaminated soil and groundwater microbial ecological remediation equipment. The device can be used to solve the problems of theoretical technical methods, remediation period and efficiency, construction cost and other aspects of organic contaminated sites with different permeability soil layers, and ultimately achieve the goal of quickly reducing the concentration of organic pollutants in the site to below the remediation target value. The device has the advantages of simple structure, easy use, and can efficiently repair contaminated soil and groundwater in low permeability soil layers of organic contaminated sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a process flow chart of a mobile indigenous bacteria remediation and treatment coupling device.

[0012] Figure 2 This is a schematic diagram of the principle of a mobile indigenous bacteria remediation and management coupling device.

[0013] Figure 3 This is a schematic diagram of the high-pressure rotary jetting points and underground well pipe layout.

[0014] Figure 4 Schematic diagram of the spacing between injection wells and electric heating wells.

[0015] Figure 5 This is a schematic diagram and a partial enlarged view of the protection monitoring system installation.

[0016] Figure 6 Schematic diagram of the cross-section of the protection monitoring system installation. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] like Figures 1 to 6As shown, the mobile indigenous bacteria restoration and treatment coupling equipment of this embodiment includes a microbial culture system 1, a high-pressure rotary spray injection system 2, an extraction and recovery system 3, a temperature control system 4 and a protection monitoring system 5, etc. The microbial culture system 1 includes an indigenous bacteria culture barrel, a nutrient solution configuration barrel, a temporary storage tank, a grouting pump and an online monitoring instrument, etc. The indigenous bacteria culture barrel and the nutrient solution configuration barrel are connected by a pipeline, the indigenous bacteria culture barrel and the temporary storage tank are connected by a pipeline, the water outlet of the grouting pump and the water inlet of the indigenous bacteria culture barrel are connected by a pipeline, and the high-pressure rotary spray injection system 2 includes a high-pressure rotary spray drilling rig, a pharmaceutical solution It is equipped with a barrel, an air compressor and a high-pressure grouting pump, etc. The extraction and recovery system 3 includes an injection well, an extraction well, a vacuum pump, a temporary storage tank and a grouting pump, etc. The water inlet of the vacuum pump is extended to the interior of the extraction well through a pipeline, and the water outlet of the vacuum pump is connected with the temporary storage tank through a pipeline. The water outlet of the temporary storage tank is connected to the water inlet of the high-pressure grouting pump through a pipeline. The temperature control system 4 includes an automatic temperature adjustment controller and an electric heating well, etc. The protection and monitoring system 5 includes a drainage ditch, a supporting structure, a water-stop curtain and a monitoring well, etc. The water outlet of the high-pressure grouting pump is extended to the interior of the injection well through a pipeline, and the water outlet of the vacuum pump is connected with a valve.

[0019] refer to Figure 2 and Figure 5 , monitoring wells and extraction wells are made of PVC well pipes.

[0020] The monitoring well and extraction well made of PVC well pipe in this embodiment have the advantage of being recyclable.

[0021] refer to Figure 2 and Figure 5 The interior of the monitoring well is equipped with water-stop curtains, support structures and drainage ditches.

[0022] This embodiment can block water inside and outside the repair area by arranging a water-stop curtain, a supporting structure, a drainage ditch, etc. inside the monitoring well.

[0023] refer to Figure 2 and Figure 5 The water-stop curtain is a bite-type Larsen steel sheet pile.

[0024] This embodiment has the advantage of good water-stopping effect through the water-stopping curtain made of interlocking Larsen steel sheet piles.

[0025] refer to Figure 2 and Figure 5 The supporting structure is made of I-shaped steel.

[0026] The supporting structure of this embodiment, which is made of I-shaped steel material, has the advantage of high hardness.

[0027] The working principle and use process of this utility model: The process flow of this equipment is as follows:

[0028] 1. Sampling for initial inspection, screening and enrichment of indigenous bacteria to determine the types and concentrations of organic pollutants. Collect a small amount of soil and groundwater from the polluted area to test pH values, concentrations of organic pollutants and other related indicators. At the same time, screen, separate and enrich indigenous microorganisms in the contaminated soil in a laboratory environment to prepare indigenous microbial strains for storage;

[0029] 2. Three connections and one leveling, materials and equipment are brought in, and all major systems are assembled, debugged and tested. The surface of the ground in the restoration area is leveled, and various stones, trees and other debris on the surface are removed; the prepared indigenous fungi and various agents (surfactants, nutrients, etc.) are transported to the restoration site;

[0030] 3 Protection monitoring system 5 and ancillary facilities. Build drainage ditches; install support structures and water-stop curtains; install monitoring wells and extraction wells; set up temporary storage pools, inject clean water, turn on temporary storage pool heating equipment and aeration equipment, and maintain the water temperature and dissolved oxygen in the pools;

[0031] 4 Start the microbial culture system 1, domesticate and expand the indigenous microorganisms on site. Add indigenous microbial strains to the indigenous bacteria culture barrel, inject the prepared nutrient solution, and perform temperature control, aeration, stirring, pH adjustment and other operations. After the indigenous bacteria are expanded to a certain concentration for the first time, the bacterial solution and nutrient solution are simultaneously injected into the temporary storage pool for further large-scale expansion and strengthening of standby;

[0032] 5. Determine relevant parameters through on-site pilot testing. After all systems are debugged and running normally, quickly conduct on-site pilot testing. Select an area with representative soil permeability levels on the site, operate a high-pressure jet grouting drill to conduct an on-site pilot test, to determine the best operating parameters and other information, and provide technical support for subsequent remediation implementation, such as drilling equipment operating parameters, maximum effective radius, etc.; determine the jet grouting injection points in the remediation area and make clear markings; determine the dosage of biosurfactants and indigenous bacterial liquid, and determine the short remediation cycle and the number of injection and extraction cycles;

[0033] 6. Spray-jet biosurfactant injection. According to the technical parameters determined in step 5, operate the high-pressure spray-jet drilling rig for the first time according to the "double-tube method" to spray-jet biosurfactant and high-pressure air to the point, and mix the contaminated soil and groundwater in the remediation area evenly;

[0034] 7. Rotary jet injection of indigenous bacterial solution. The secondary operation of the high-pressure rotary jet drilling rig injects the indigenous bacterial solution and high-pressure air to disperse the indigenous bacterial solution rich in dissolved oxygen, electron acceptors, and nutrients into the soil environment within the maximum effective impact diameter of the point, so that it can fully contact with organic pollutants; the electric heating well control system is turned on simultaneously to maintain the underground solution environment temperature in the repair area stable at 25-30°C; after the rotary jet injection is completed, an injection well is established at the original point, and electric heating wells are arranged at a certain distance. All subsequent solutions are injected intermittently at a certain period using the "in-situ injection method";

[0035] 8. Start the extraction and recovery system 3. Turn on the vacuum pump, and intermittently extract the underground solution rich in microorganisms and organic pollutants in the extraction well into the temporary storage tank at the same cycle as in step 7, and inject nutrient solution at the same time; in the temporary storage tank, the indigenous microorganisms use the organic pollutants (carbon) carried in the underground solution and the injected nutrients (nitrogen, phosphorus, etc.) to grow and reproduce and maintain high activity;

[0036] 9. Sampling, retesting and repeating the short cycle. After a short remediation cycle (steps 6 to 8 last for 7 days, which is considered as 1 short cycle) is completed, a small amount of soil and groundwater in the contaminated area is collected to test pH value, concentration of organic pollutants and other related indicators; if the test results of the collected samples meet the remediation target value requirements, the remediation target of the area has been achieved; if the test results are unqualified, the "short remediation cycle" is repeated until the concentration of pollutants in the soil and groundwater drops below the remediation target value.

[0037] The microbial cultivation system 1 collects indigenous microorganisms in the contaminated soil and groundwater according to the differences in organic pollutants in different contaminated sites, enriches and screens out specific strains with the best degradation effect, activates, domesticates and cultivates them on site to improve the degradation efficiency of microorganisms and ensure the degradation effect of pollutants.

[0038] The high-pressure rotary jet injection system 2 is equipped with a "double-tube method" high-pressure rotary jet drilling rig. The injected solution mainly includes biological surfactants, indigenous bacterial liquid, etc., and with the impact of high-pressure air, it can stir the deep-seated low-permeability contaminated soil evenly to form a mud state, so that the solution and soil are effectively and evenly mixed and fully reacted. The elution effect of the biological surfactant to enhance the solubility and wash out the organic pollutants adsorbed in the soil colloid into the underground solution, increase the contact area between the indigenous bacteria and the pollutants, thereby greatly shortening the time for the indigenous bacteria to repair, and achieving the purpose of quickly reducing the concentration of organic pollutants in the soil.

[0039] The extraction and recovery system 3 is used in conjunction with the microbial cultivation system 1 to maximize the use of the reproduction characteristics and specific degradation effects of microorganisms, improve the recycling rate of microorganisms, and ensure the degradation effect of microorganisms on organic pollutants, thereby reducing the cost of multiple purchases, activations, and expansions of microorganisms. Through a unique circle layout method, the vacuum pump is used to extract the underground solution in the repair area to form a directional flow trend, and at the same time, the bacterial solution is injected into the temporary storage pool to continuously replenish the underground environment with indigenous bacteria, nutrients, and dissolved oxygen.

[0040] Biosurfactants are highly effective commercial products that are harmless or low-toxic to indigenous bacteria, selected through small-scale experiments. They include one or more of rhamnolipids, sophorolipids, and trehalolipids. By utilizing their synergistic and solubilizing elution effects, the cycle of indigenous bacteria restoration can be greatly shortened, while reducing the dosage of chemicals, equipment operating costs, and labor costs.

[0041] The temperature control system 4 is an automatic temperature control controller, and its installation locations include indigenous bacteria culture barrels, nutrient solution preparation barrels, temporary storage tanks, electric heating wells, etc. Its main function is to provide stable temperature conditions for microorganisms injected into the contaminated soil and groundwater environment in the repair area, maintain the activity of indigenous bacteria and the ability to degrade organic pollutants; at the same time, under certain conditions, it can operate continuously for a long time, speed up the repair progress, and shorten the construction period; and the system has its own intelligent water level sensing device, and the heating will be stopped when the water level drops to the warning line of the heating equipment to prevent equipment damage.

[0042] The protection monitoring system 5 uses drainage ditches to collect rainwater, etc., to reduce the exchange of water inside and outside the restoration area and avoid surface runoff pollution; the support structure ensures the safety and stability of the surrounding soil in the restoration area; the water-stop curtain acts as a horizontal barrier to pollutants in the restoration area, preventing pollutants from spreading through groundwater to the surrounding healthy soil and groundwater environment, effectively avoiding secondary pollution; the monitoring wells are used to regularly collect groundwater to detect changes in related pollutant indicators.

Claims

1. A mobile indigenous bacteria remediation and treatment coupling device, comprising a microbial culture system (1), a high-pressure rotary spray injection system (2), an extraction and recovery system (3), a temperature control system (4) and a protection monitoring system (5), characterized in that: The microorganism culture system (1) comprises an indigenous bacteria culture barrel, a nutrient solution preparation barrel, a temporary storage tank, a grouting pump and an online monitoring instrument. The indigenous bacteria culture barrel and the nutrient solution preparation barrel are connected via a pipeline, the indigenous bacteria culture barrel and the temporary storage tank are connected via a pipeline, the water outlet of the grouting pump and the water inlet of the indigenous bacteria culture barrel are connected via a pipeline, the high-pressure rotary jet injection system (2) comprises a high-pressure rotary jet drilling rig, a pharmaceutical solution preparation barrel, an air compressor and a high-pressure grouting pump, and the extraction and recovery system (3) comprises an injection well, an extraction well, a vacuum pump, and a vacuum pump. A pump, a temporary storage tank and a grouting pump, the water inlet of the vacuum pump extends to the interior of the extraction well through a pipeline, the water outlet of the vacuum pump is connected to the temporary storage tank through a pipeline, the water outlet of the temporary storage tank is connected to the water inlet of the high-pressure grouting pump through a pipeline, the temperature control system (4) includes an automatic temperature adjustment controller and an electric heating well, the protection monitoring system (5) includes a drainage ditch, a supporting structure, a water-stop curtain and a monitoring well, the water outlet of the high-pressure grouting pump extends to the interior of the injection well through a pipeline, and the water outlet of the vacuum pump is connected to a valve.

2. The mobile indigenous bacteria remediation and treatment coupling device according to claim 1 is characterized by: The monitoring well and the extraction well are both made of PVC well pipes.

3. The mobile indigenous bacteria remediation and treatment coupling device according to claim 2 is characterized by: The monitoring well is provided with a water-stop curtain, a supporting structure and a drainage ditch inside.

4. The mobile indigenous bacteria remediation and treatment coupling device according to claim 3 is characterized by: The water-stop curtain is an interlocking Larsen steel sheet pile.

5. A mobile indigenous bacteria remediation and treatment coupling device according to claim 1, 2 or 4, characterized in that: The supporting structure is made of I-shaped steel.

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