A sand box system for simulating contaminated soil remediation in a multifunctional area

Abstract

The invention discloses a sand box system for simulating the remediation of contaminated soil in a multifunctional area, which relates to the technical field of soil pollution prevention and control, including a stand, multiple sand boxes, a water spray system, a drainage collection system, a soil parameter monitoring system and a water quality parameter monitoring system; each sand box is fixed on the stand; one of the sand boxes is used as an area for heat-enhanced microbial remediation; one of the sand boxes is used as an area for nanomaterial-enhanced microbial remediation; one of the sand boxes is used as an area for plant-enhanced microbial remediation; one of the sand boxes is used as a control unit for the above sand boxes; each sand box is provided with a drug injection well pipeline and a monitoring well pipeline; each monitoring hole on the monitoring well pipeline is provided with a monitoring probe of a soil monitoring system and a water quality parameter monitoring system; the water spray system and the drainage collection system form a flowing groundwater environment. Provide a variety of test simulation areas for enhanced microbial remediation, and provide technical support for soil bioremediation of complex contaminated sites.

Description

Technical Field

[0001] The invention relates to the technical field of soil pollution prevention and control, and in particular to a sand box system for simulating the restoration of contaminated soil in a multifunctional area. Background Art

[0002] In recent years, with the rapid development of my country's economy and society, and the in-depth implementation of the policies of "withdrawing from the second and entering the third" and "withdrawing from the city and entering the park", a large number of complex polluted sites left by coking plants, solvent plants, electroplating plants, chromium salt plants and other industrial enterprises have appeared in many cities and their surrounding areas in the Yangtze River Economic Belt and the key areas of Beijing-Tianjin-Hebei. It is estimated that the number of complex polluted sites in the country has reached more than 100,000, of which more than 15,000 are electroplating plants. By 2008 alone, 22,500 industrial enterprises such as solvent plants and coking plants had been closed or relocated, and more than 60 chromium salt plants and chromium slag dumps had been closed in recent years. The soil of the site mostly exists in the form of heavy metal (such as arsenic, chromium, cadmium) complex pollution, organic complex pollution (such as polycyclic aromatic hydrocarbons, chlorinated hydrocarbons, etc.), heavy metal and organic complex pollution. The complex pollutants in the soil of the site have become "chemical time bombs" around people, seriously threatening the regional ecological environment safety and human health. Therefore, it is urgent to carry out research on the treatment and restoration of complex polluted sites, which has become a major scientific and technological demand for my country's ecological environment governance and sustainable development. Judging from the current research and development trends of soil pollution remediation at home and abroad, the types of soil pollution have evolved from single pollution to complex pollution, and the remediation methods have evolved from ex situ to in situ, from physical and chemical to biological, and from single technology to combined or enhanced synergistic technology. In recent years, green and sustainable in situ bioremediation of soil at complex contaminated sites has become a new requirement for global soil pollution control.

[0003] At present, the research on bioremediation technology of soil pollution at home and abroad is concentrated on the research of single inorganic pollutant heavy metal (for example: CN115055513A) or organic pollutant (for example: CN103624070B) in the laboratory and the use of single remediation technology. However, most of the soils at the site are currently in the form of heavy metal (such as arsenic, chromium, cadmium) complex pollution, organic complex pollution (such as polycyclic aromatic hydrocarbons, chlorinated hydrocarbons, etc.), heavy metal and organic complex pollution. Complex interactions may occur between soil complex pollutants, resulting in changes in their toxicity, mobility and biodegradability, which increases the difficulty of predicting and remediating pollutants. There is a lack of experimental equipment required for the combination of complex pollution site remediation methods or enhanced synergistic technologies. Summary of the invention

[0004] The purpose of the present invention is to provide a sand box system for simulating the remediation of contaminated soil in a multifunctional area, so as to solve the problems existing in the above-mentioned prior art, provide a variety of test simulation areas for enhanced microbial remediation, and provide technical support for soil bioremediation in complex contaminated sites.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a sand box system for simulating the remediation of contaminated soil in a multifunctional area, comprising a stand, a plurality of sand boxes, a water spray system, a drainage collection system, a soil parameter monitoring system and a water quality parameter monitoring system; each of the sand boxes is located at the same height, and each of the sand boxes is fixed on the stand, and contaminated soil is placed in each of the sand boxes; one of the sand boxes is used as an area for heat-enhanced microbial remediation, and a heating unit for regulating temperature and a temperature monitoring system are provided in the sand box; one of the sand boxes is used as an area for nanomaterial-enhanced microbial remediation, and nanomaterials are added to the contaminated soil in the sand box and deep-rooted tolerant plants are planted; one of the sand boxes is used as an area for plant-enhanced microbial remediation, and hyperaccumulator plants are planted on the contaminated soil in the sand box; one of the sand boxes serves as a control unit for the above sand boxes, and serves as a control The internal area of ​​the sand box of the unit is divided into multiple control areas, and each control area corresponds to the other sand boxes one by one; each sand box is provided with a drug injection well pipe and a monitoring well pipe; each drug injection well pipe is provided with a drug injection hole connected to the corresponding interior of the sand box; each monitoring well pipe is provided with a monitoring hole connected to the corresponding interior of the sand box, and the monitoring holes on each monitoring well pipe are provided with monitoring probes of the soil monitoring system and the water quality parameter monitoring system; each sand box is provided with a sprinkler on the top, and each sprinkler is connected and connected to the water sprinkler system, and the water sprinkler system is used for spraying water; the drainage collection system includes a waste liquid collection pretreatment barrel, which is lower than each sand box in the vertical direction, and the bottom of each sand box is connected to the waste liquid collection pretreatment barrel.

[0007] Preferably, the top of each of the sand boxes is provided with an openable and closable heat-insulating cover, and the heat-insulating cover can cover the top opening of the sand box.

[0008] Preferably, the top of each sand box is provided with a lighting system that can be raised and lowered.

[0009] Preferably, the heating unit includes a heating pipe, a solar water heater, an insulated storage barrel and a supply pump; the heating pipe is used to be buried in the contaminated soil in the sand box serving as the area for heat-enhanced microbial remediation; the output port of the solar water heater is connected to the water inlet of the insulated storage barrel, the water outlet of the insulated storage barrel is connected and connected to one end of the heating pipe, the other end of the heating pipe is connected to the input port of the supply pump, and the output port of the supply pump is connected and connected to the water inlet of the solar water heater.

[0010] Preferably, each of the sand boxes is provided with an extraction well pipeline, and the extraction well pipeline is provided with an extraction hole connected to the interior of the sand box.

[0011] Preferably, the agent injection well pipeline includes a first injection pipeline and a second injection pipeline, the lower end opening of the first injection pipeline is located in the middle of the contaminated soil in the sand box; the lower end opening of the second injection pipeline is located at the bottom of the contaminated soil in the sand box.

[0012] Preferably, the water outlet of the waste liquid collection pretreatment barrel is connected to a waste liquid treatment system, the waste liquid treatment system is used to treat the waste liquid, and the discharge port of the waste liquid treatment system can be connected to the heat-insulating storage barrel.

[0013] Preferably, it also includes a controller, which is communicatively connected with the water sprinkler system, the soil parameter monitoring system, the water quality parameter monitoring system, the heating unit, and the temperature monitoring system.

[0014] Preferably, a platform is arranged above each of the sand boxes, guardrails are arranged around the platform, and stairs are arranged between the platform and the ground.

[0015] Preferably, at least one side wall of the sand box is made of transparent material.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The sand box system for simulating the remediation of contaminated soil in a multifunctional area provided by the present invention has a water spray system and a drainage collection system that can simulate the groundwater environment at the bottom of the contaminated soil in each sand box; a plurality of sand boxes are provided, one of which is used as an area for heat-enhanced microbial remediation, and the contaminated soil is heated by a temperature monitoring system and a heating unit provided inside, and a bioremediation agent is injected through an agent injection well pipeline, so as to provide a suitable temperature and a sufficient carbon source for the growth of microorganisms, enhance the activity of microorganisms, and promote the degradation of pollutants by remediation-type microorganisms; one of which is used as an area for nanomaterial-enhanced microbial remediation, and the remediation effect of plant rhizosphere microorganisms is enhanced by adding nanomaterials and planting deep-root tolerant plants, and at the same time, the purification effect of pollutants in composite contaminated soil and groundwater is enhanced through the synergistic degradation effect of nanomaterials; one of which is used as an area for nanomaterial-enhanced microbial remediation, and the remediation effect of plant rhizosphere microorganisms is enhanced by adding nanomaterials and planting deep-root tolerant plants, and at the same time, the synergistic degradation effect of nanomaterials is enhanced; and one of which is used for As an area for plant-enhanced microbial remediation, by utilizing indigenous microbial communities and adding special functional microbial populations, a highly efficient enhanced microbial flora is constructed, and hyperaccumulator plants are planted to enhance the transformation effect of rhizosphere microorganisms on heavy metal pollutants and the plant extraction effect, and a microbial-plant joint remediation system is established; one of them serves as a control unit for other sand boxes, and is internally divided into corresponding control areas, thereby realizing a test simulation area with multiple enhanced microbial remediation and corresponding comparison areas, providing technical support for soil bioremediation of complex contaminated sites; and setting up soil parameter monitoring systems and water quality parameter monitoring systems to explore the migration patterns of various pollutants in soil and groundwater, and provide remediation technologies for single or coupled use of enhanced microbial remediation technologies such as heat, agents, materials, and plants, to achieve real-time monitoring of various physical and chemical parameters during soil remediation.

[0018] Furthermore, the setting of the heat preservation cover can be closed when the ambient temperature is too low or too high, providing a good temperature environment inside each sand box, ensuring a healthy growth environment for the plants in the sand box, and ensuring effective control of water evaporation in the sand box.

[0019] Furthermore, the lighting system can provide a sunlight-simulating environment in each sand box, and simulate different sunlight effects during the day by lifting and lowering.

[0020] Furthermore, a solar water heater is used to heat water using solar energy, and through a supply pump and heating pipe, combined with a temperature monitoring system, a temperature environment suitable for the growth of microorganisms is provided to the contaminated soil in the sand box, effectively utilizing light energy and saving energy.

[0021] Furthermore, the setting of the extraction well pipeline can facilitate the extraction and detection of various parameters of contaminated soil and groundwater during the test.

[0022] Furthermore, the reagent injection well pipeline adopts a medium well formed by a first injection pipeline and a deep well formed by a second injection pipeline, so that each additive can be evenly added to the contaminated soil or groundwater to make it more evenly distributed.

[0023] Furthermore, the waste liquid treatment system can treat the waste liquid discharged from each sand box and recycle the treated water to improve the utilization rate of water resources.

[0024] Furthermore, the controller is used to realize automatic and intelligent control of each part, improve the automation level of the equipment, reduce the labor intensity of the operator, and improve the accuracy of the experiment to ensure the experimental effect.

[0025] Furthermore, the setting of the platform enables the operator to operate each sand box more conveniently, thereby improving work efficiency.

[0026] Furthermore, at least one side wall of the sand box is made of a transparent material, so that the operator can observe the internal conditions of the sand box more intuitively. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the overall structure of a sand box system for simulating contaminated soil remediation in a multifunctional area provided by the present invention;

[0029] Figure 2 A side view of a sand box system for simulating contaminated soil remediation in a multifunctional area provided by the present invention;

[0030] Figure 3 A top view of a sand box system for simulating contaminated soil remediation in a multifunctional area provided by the present invention;

[0031] Figure 4 An overall diagram of the control system in the sand box system for simulating contaminated soil remediation in a multifunctional area provided by the present invention;

[0032] Figure 5 A schematic diagram of the control of a display device in a sand box system for simulating contaminated soil remediation in a multifunctional area provided by the present invention.

[0033] In the figure:

[0034] 100-Sand box system for simulated contaminated soil remediation in multi-functional area;

[0035] 1-sand box; 11-pipeline for reagent injection well; 111-first injection pipe; 112-second injection pipe; 12-pipeline for monitoring well; 13-pipeline for extraction well; 14-insulation cover; 15-lighting system; 16-platform; 161-guardrail; 162-staircase; 17-stand;

[0036] 2-water spray system; 21-sprinkler; 22-water inlet flow control valve;

[0037] 3- drainage collection system; 31- waste liquid collection pretreatment barrel; 32- waste liquid treatment system; 33- water outlet flow control valve; 34- waste water treatment pump flow reuse system;

[0038] 4-PLC controller;

[0039] 5-heating unit; 51-solar water heater; 52-insulated storage barrel;

[0040] 6- Ground. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The purpose of the present invention is to provide a sand box system for simulating the remediation of contaminated soil in a multifunctional area, so as to solve the problems existing in the prior art, provide a variety of experimental simulation areas for enhanced microbial remediation, and provide technical support for soil bioremediation in complex contaminated sites.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Embodiment 1

[0045] This embodiment provides a sand box system 100 for simulating the remediation of contaminated soil in a multifunctional area, mainly but not limited to the remediation experiment of composite contaminated soil, such as Figure 1 to Figure 5As shown, it includes a stand 17, multiple sand boxes 1, a water sprinkler system 2, a drainage collection system 3, a soil parameter monitoring system and a water quality parameter monitoring system; each sand box 1 is located at the same height, and each sand box 1 is fixed on the stand 17, and contaminated soil is placed in each sand box 1; one of the sand boxes 1 is used as an area for heat-enhanced microbial remediation, and a heating unit 5 and a temperature monitoring system for regulating temperature are provided in the sand box 1; one of the sand boxes 1 is used as an area for nanomaterial-enhanced microbial remediation, and nanomaterials are added to the contaminated soil in the sand box 1 and deep-rooted tolerant plants are planted; one of the sand boxes 1 is used as an area for plant-enhanced microbial remediation, and hyperaccumulator plants are planted on the contaminated soil in the sand box 1; one of the sand boxes 1 serves as a control unit for the above sand boxes 1, and the interior of the sand box 1 serving as the control unit The inner area is divided into a plurality of control areas, each of which corresponds to other sand boxes 1 one by one; each sand box 1 is provided with a reagent injection well pipe 11 and a monitoring well pipe 12; each reagent injection well pipe 11 is provided with a reagent injection hole connected to the inside of the corresponding sand box 1; each monitoring well pipe 12 is provided with a monitoring hole connected to the inside of the corresponding sand box 1, and the monitoring holes on each monitoring well pipe 12 are provided with monitoring probes of the soil monitoring system and the water quality parameter monitoring system; each sand box 1 is provided with a sprinkler 21 on the top, each sprinkler 21 is connected and connected to the water sprinkler system 2, and the water sprinkler system 2 is used for spraying water; the drainage collection system 3 includes a waste liquid collection pretreatment barrel 31, the waste liquid collection pretreatment barrel 31 is lower than each sand box 1 in the vertical direction, and the bottom of each sand box 1 is connected to the waste liquid collection pretreatment barrel 31.

[0046] The water spray system 2 and the drainage collection system 3 can simulate the groundwater environment at the bottom of the contaminated soil in each sand box 1; by setting up a plurality of sand boxes 1, one of them is used as a heat-enhanced microbial remediation area, and the contaminated soil is heated by the temperature monitoring system and the heating unit 5 set inside, and the bioremediation agent is injected through the agent injection well pipeline 11 to provide a suitable temperature and sufficient carbon source for the growth of microorganisms, enhance the activity of microorganisms, and promote the degradation of pollutants by remediation microorganisms; one of them is used as a nanomaterial-enhanced microbial remediation area, and the remediation effect of plant rhizosphere microorganisms is enhanced by adding nanomaterials and planting deep-root tolerant plants. At the same time, the synergistic degradation effect of nanomaterials is enhanced to enhance the purification effect of pollutants in complex contaminated soil and groundwater; one of them is used as a plant-enhanced microbial In the remediation area, by utilizing indigenous microbial communities and adding special functional microbial populations, efficient enhanced microbial flora are constructed, and hyperaccumulator plants are planted to enhance the transformation effect of rhizosphere microorganisms on heavy metal pollutants and the plant extraction effect, and a microbial-plant joint remediation system is established; one of them serves as a control unit for other sand boxes 1, and is internally divided into corresponding control areas, thereby realizing a test simulation area with multiple enhanced microbial remediation and corresponding comparison areas, providing technical support for soil bioremediation of complex contaminated sites; and setting up a soil parameter monitoring system and a water quality parameter monitoring system to explore the migration laws of various pollutants in soil and groundwater, and provide remediation technologies for single or coupled use of enhanced microbial remediation technologies such as heat, agents, materials, and plants, so as to realize real-time monitoring of various physical and chemical parameters during soil remediation.

[0047] Specifically, each water spray system 2 can be connected to the same water storage tank so as to centrally manage water supply issues.

[0048] Among them, the top of the sand box 1 can also be provided with a heat preservation cover 14 and a lighting system 15:

[0049] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 2 As shown, each sand box 1 is provided with an openable and closable heat preservation cover 14 on the top, and the heat preservation cover 14 can cover the top opening of the sand box 1. The heat preservation cover 14 can be closed when the ambient temperature is too low or too high, providing a good temperature environment inside each sand box 1, ensuring a healthy growth environment for the plants in the sand box 1, and ensuring effective control of water evaporation in the sand box 1.

[0050] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 2 As shown, a lighting system 15 capable of lifting and lowering is provided on the top of each flask 1. The lighting system 15 can provide a sunlight-simulating environment in each flask 1, and can simulate different sunlight effects during the day by lifting and lowering.

[0051] Among them, regarding the composition of the heating unit 5 in the sand box 1 for heat-enhanced microbial remediation:

[0052] Among the optional solutions of this embodiment, it is more preferred that Figure 1 to Figure 3 As shown, the heating unit 5 includes a heating pipe, a solar water heater 51, an insulated storage barrel 52 and a supply pump; the heating pipe is used to be buried in the contaminated soil in the sand box 1 as the area for heat-enhanced microbial remediation; the output port of the solar water heater 51 is connected to the water inlet of the insulated storage barrel 52, the water outlet of the insulated storage barrel 52 is connected and connected to one end of the heating pipe, the other end of the heating pipe is connected to the input port of the supply pump, and the output port of the supply pump is connected and connected to the water inlet of the solar water heater 51. The solar water heater 51 is used to heat water using solar energy, and through the supply pump and the heating pipe, and in combination with the temperature monitoring system, a temperature environment suitable for the growth of microorganisms is provided to the contaminated soil in the sand box 1, effectively utilizing light energy and saving energy.

[0053] Specifically, the height of the solar water heater 51 is higher than the height of the insulation storage barrel 52, and the height of the insulation storage barrel 52 is higher than the height of the heating tube. The water flows from the solar water heater 51 into the insulation storage barrel 52 by its own gravity, and the water in the insulation storage barrel 52 flows into the heating tube by its own gravity. The water in the heating tube is pumped into the solar water heater 51 through the supply pump connected to the end thereof.

[0054] Specifically, a valve may be provided on the connecting pipe between the solar water heater 51 and the heat preservation storage barrel 52 , and opened when necessary so that the water in the solar water heater 51 can flow into the heat preservation storage barrel 52 .

[0055] Specifically, the heat preservation storage barrel 52 and the solar water heater 51 are also provided with holes communicating with the outside world so as to facilitate the smooth circulation of water in the pipeline.

[0056] In order to facilitate the extraction of samples from the inside of each sand box 1 so as to detect various parameters, the following settings can also be made:

[0057] Among the optional solutions of this embodiment, it is more preferred that Figure 1 to Figure 3 As shown, each sand box 1 is provided with an extraction well pipe 13, and the extraction well pipe 13 is provided with an extraction hole connected to the inside of the sand box 1. The setting of the extraction well pipe 13 can facilitate the extraction and detection of various parameters of contaminated soil and groundwater during the test.

[0058] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 2As shown, the reagent injection well pipeline 11 includes a first injection pipeline 111 and a second injection pipeline 112. The lower end opening of the first injection pipeline 111 is located in the middle of the contaminated soil in the sand box 1; the lower end opening of the second injection pipeline 112 is located at the bottom of the contaminated soil in the sand box 1. The reagent injection well pipeline 11 uses a medium well formed by the first injection pipeline 111 and a deep well formed by the second injection pipeline 112, so that each additive can be evenly added to the contaminated soil or groundwater to make it more evenly distributed.

[0059] The extraction well pipeline 13, the reagent injection well pipeline 11 and the monitoring well pipeline 12 can be set in distribution mode, distribution position and quantity according to actual needs.

[0060] Among them, for the wastewater treatment setting in the waste liquid collection pretreatment barrel 31:

[0061] Specifically, the wastewater in the waste liquid collection pretreatment barrel 31 can be treated by the wastewater treatment system and discharged when it meets the discharge standards, or it can be treated by the wastewater treatment system and then recycled, such as added to the solar water heater 51.

[0062] Among the optional solutions of this embodiment, it is more preferred that Figure 1 to Figure 3 As shown, the outlet of the waste liquid collection pretreatment barrel 31 is connected to a waste liquid treatment system 32, which is used to treat the waste liquid, and the discharge port of the waste liquid treatment system 32 can be connected to the heat preservation storage barrel 52. The waste liquid treatment system 32 can treat the waste liquid discharged from each sand box 1, and recycle the treated water to improve the utilization rate of water resources.

[0063] Specifically, the waste liquid treatment system 32 is any existing water treatment equipment.

[0064] Among them, regarding the control of the control system:

[0065] Among the optional solutions of this embodiment, it is more preferred that Figure 1 to Figure 4 As shown, the controller is also included, and the controller is connected to the water spray system 2, the soil parameter monitoring system, the water quality parameter monitoring system, the heating unit 5, and the temperature monitoring system. The controller is used to realize the automatic and intelligent control of each part, improve the automation level of the equipment, reduce the labor intensity of the operator, and improve the accuracy of the experiment to ensure the experimental effect.

[0066] Specifically, the water sprinkler system 2 and the drainage collection system 3 are respectively provided with an inlet flow sensor and an outlet flow sensor; the soil parameter monitoring system includes sensors for soil pH value, temperature, humidity, salinity, N / P / K content, etc.; the water quality parameter monitoring system includes sensors for groundwater level, groundwater pH value, groundwater conductivity, groundwater dissolved oxygen, etc.;

[0067] Specifically, the controller in the control system is a PLC controller 4; the PLC controller 4 can be connected to a computer or a visualization platform 16 via a router or an Ethernet switch; and the PLC controller 4 is connected to both a display device and a printer.

[0068] Specifically, an inlet flow control valve 22 is provided on the output pipeline of the water sprinkler system 2, and an outlet flow control valve is provided on the input pipeline of the drainage collection system 3; specifically, the inlet flow control valve 22 and the outlet flow control valve can both regulate the flow size and monitor the flow data.

[0069] Specifically, the modules controllable by the PLC controller 4 mainly include but are not limited to a lighting system 15 for simulating sunlight for supplementary lighting, a temperature control system (the heating of the heating unit 5 is controlled according to the temperature monitoring system in the sand box 1 for heat-enhanced microbial remediation), a water spray system 2, a feeding system for feeding various types of remediation agents (an automatic feeding device is correspondingly provided in each agent injection well pipeline 11, and the automatic feeding device is any existing device capable of feeding, and the feeding is controlled by the feeding system), a wastewater treatment pump flow recycling system 34 (the wastewater treatment pump flow recycling system 34 is used to return the water treated by the waste liquid treatment system 32 to the insulated storage barrel 52, and can be an extraction pump), a groundwater extraction control system (a water pump is provided in each extraction well pipeline 13, and the groundwater extraction control system is used to control the water pump), and an inlet flow control valve 22 and an outlet flow control valve in the inlet and outlet water modules.

[0070] Specifically, the PLC controller 4 is also connected to various sensor modules, including but not limited to water inlet and outlet quantitative sensors, soil pH, nutrient and other sensors, soil temperature and humidity sensors, groundwater multi-parameter sensors (including but not limited to groundwater level, groundwater pH value, groundwater conductivity, groundwater dissolved oxygen, etc.), etc.

[0071] Specifically, the PLC controller 4 is also connected to a data input module, which specifically includes but is not limited to inlet and outlet water quality control input, soil parameter monitoring frequency input, groundwater parameter monitoring frequency input, etc.

[0072] Specifically, the display device is provided with a user management layer, an execution control layer and a data acquisition and display layer; wherein the user management layer specifically includes but is not limited to a control switch, a power indicator light, an alarm light or an alarm button, a reset button, an emergency stop button, etc.; wherein the execution control layer specifically includes but is not limited to a lighting system 15, a temperature control system, a water spray system 2, a feeding system, a wastewater treatment pump flow reuse system 34, a groundwater extraction control system, an inlet flow control valve 22, an outlet flow control valve, a switch of a water pump in the wastewater treatment pump flow reuse system 34, an inlet quantitative speed control, an outlet quantitative speed control, etc.; wherein the data acquisition and display layer specifically includes but is not limited to inlet and outlet water volume, inlet and outlet flow rate, groundwater level, soil salinity, soil temperature, soil moisture, soil pH, soil N / P / K content, groundwater pH, groundwater conductivity, groundwater dissolved oxygen, etc.

[0073] Among them, other settings about sand box 1:

[0074] Specifically, the sand boxes 1 have the same size, and each sand box 1 has a size of 2m*2m*2m.

[0075] Among the optional solutions of this embodiment, it is more preferred that Figure 1 to Figure 3 As shown, a platform 16 is provided above each sand box 1, a guardrail 161 is provided around the platform 16, and a staircase 162 is provided between the platform 16 and the ground 6. The provision of the platform 16 enables the operator to operate each sand box 1 more conveniently, thereby improving work efficiency.

[0076] Specifically, in order to increase the firmness of the platform 16, necessary auxiliary supports may be provided. The connection of the auxiliary supports may adopt any existing structure, such as Figure 1 As shown, it is mainly capable of increasing the firmness of the platform 16 .

[0077] In the optional solution of this embodiment, it is more preferred that at least one side wall of the sand box 1 is made of transparent material. At least one side wall of the sand box 1 is made of transparent material, so that the operator can observe the internal situation of the sand box 1 more intuitively.

[0078] Among them, the distribution of contaminated soil in the sand box 1 from top to bottom is original soil, silty sand, and sandy soil.

[0079] Specifically, other necessary monitoring equipment may be provided inside the sand box 1 used for heat-enhanced microbial remediation, nanomaterial-enhanced microbial remediation and plant-enhanced microbial remediation.

[0080] Specifically, the stand 17 is fixed on the ground 6 .

[0081] Among them, for heat-enhanced microbial remediation:

[0082] Focusing on the composite contaminated soils of typical coking plants, solvent plants, electroplating plants and chromium salt plants in my country, the concentration variation patterns of composite pollutants in the pollution sources in time and space under the action of groundwater flow are explored, and the migration patterns of composite pollutants in the underground environment are analyzed; sustainable energy (such as solar energy) is used as a thermal energy source to provide heat for the contaminated soil, and bioremediation agents are injected to provide sufficient carbon sources for microorganisms. Combined with the study of the convective heat transfer process of dynamic groundwater circulation, the injection and extraction rate parameters and the temporal and spatial variation of the temperature field under different stratum structures are investigated; the occurrence characteristics and content changes of composite pollutants in soil and aquifers under different temperature field conditions are analyzed, the activity, community structure and functional gene changes of microorganisms in the process of thermally enhanced microbial remediation are studied, and the low-temperature thermally enhanced microbial remediation effect and key processes of composite pollutants are studied.

[0083] Among them, for nanomaterials enhanced microbial remediation:

[0084] Specifically, nano zero-valent iron-biochar composite material is used.

[0085] For the soil of complex contaminated sites, the effects of composite nanomaterials (such as iron-carbon nanomaterials) on the structure, abundance and extracellular secretions of microbial communities in the site soil and aquifers are studied; the effects and action mechanisms of composite nanomaterials on the reduction process of chlorinated hydrocarbons-hexavalent chromium in the site soil and aquifers are studied; the electron transfer coupling mechanism of the key microbial communities in the site soil and aquifers mediated by composite nanomaterials for the reduction and transformation of chlorinated hydrocarbons-hexavalent chromium is elucidated; the influence mechanisms of different hydrogeology, soil types, pH, redox conditions, organic matter, biogenic elements, functional plant species, etc. on the microbial purification of chlorinated hydrocarbons-hexavalent chromium are studied, and the key regulatory factors affecting microbial purification are explored, revealing the interaction mechanism of composite nanomaterials-microorganisms-plants-pollutants and the mechanism of enhancing pollutant purification.

[0086] Among them, for plant-enhanced microbial remediation:

[0087] For complex polluted sites, using existing and planned high-efficiency enhanced microbial communities, combined with the hydrogeological characteristics of the site, the valence state transformation process and influencing factors of chromium, arsenic and cadmium complex pollutants in soil (horizontal and vertical interfaces) and aquifers under the action of microbial enhanced remediation are investigated; the spatial distribution and succession laws of indigenous microbial communities in soil and aquifers of complex polluted sites are studied, the molecular mechanisms and feedback regulation mechanisms of the biotransformation processes of different heavy metals by specific functional microbial populations are analyzed, and the timing and synergistic interaction mechanisms of the functional microbial communities in the transformation of heavy metal complex pollutants are clarified; typical representative functional plants (such as heavy metal hyperaccumulators and enrichment plants) are selected to investigate their extraction and transformation effects on complex pollutants; the dynamic changes in the structure of rhizosphere microbial communities and functional genes of heavy metal transformation are studied, and the mechanism of plants and their joint purification of heavy metal soils with microbial communities is elucidated.

[0088] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A sand box system for simulating the remediation of contaminated soil in a multifunctional area, characterized by: It includes a test bench, multiple sand boxes, a water sprinkler system, a drainage collection system, a soil parameter monitoring system, and a water quality parameter monitoring system; Each of the sand boxes is located at the same height, and each of the sand boxes is fixed on the stand, and each of the sand boxes contains contaminated soil; One of the sand boxes is used as an area for heat-enhanced microbial remediation, and a heating unit and a temperature monitoring system for regulating temperature are provided in the sand box; One of the sand boxes is used as an area for nanomaterial-enhanced microbial remediation, and nanomaterials are added to the contaminated soil in the sand box and deep-rooted tolerant plants are planted; One of the sand boxes is used as an area for plant-enhanced microbial remediation, and hyperaccumulator plants are planted on the contaminated soil in the sand box; One of the sand boxes serves as a control unit of the above sand boxes, and the inner area of ​​the sand box serving as the control unit is divided into a plurality of control areas, each of which corresponds to the other sand boxes one by one; Each of the sand boxes is provided with a reagent injection well pipeline and a monitoring well pipeline; each of the reagent injection well pipelines is provided with a reagent injection hole connected to the interior of the corresponding sand box; each of the monitoring well pipelines is provided with a monitoring hole connected to the interior of the corresponding sand box, and the monitoring holes on each of the monitoring well pipelines are provided with monitoring probes of the soil monitoring system and the water quality parameter monitoring system; A sprinkler is provided on the top of each of the sand boxes, and each of the sprinklers is connected and communicated with the water sprinkler system, and the water sprinkler system is used for spraying water; The drainage collection system comprises a waste liquid collection pretreatment barrel, which is lower than each of the sand boxes in a vertical direction, and the bottom of each of the sand boxes is respectively connected to the waste liquid collection pretreatment barrel.

2. The sand box system for simulating contaminated soil remediation in a multifunctional area according to claim 1 is characterized by: The top of each of the sand boxes is provided with an openable and closable heat-insulating cover, and the heat-insulating cover can cover the top opening of the sand box.

3. The sand box system for simulating contaminated soil remediation in a multifunctional area according to claim 1 is characterized by: The top of each sand box is provided with a lighting system that can be raised and lowered.

4. The sand box system for remediation of simulated contaminated soil in a multifunctional area according to claim 1, characterized in that: The heating unit includes a heating pipe, a solar water heater, a heat preservation storage barrel and a supply pump; the heating pipe is used to be buried in the contaminated soil in the sand box as the area of ​​heat-enhanced microbial remediation; The output port of the solar water heater is connected to the water inlet of the insulated storage barrel, the water outlet of the insulated storage barrel is connected and connected to one end of the heating pipe, the other end of the heating pipe is connected to the input port of the supply pump, and the output port of the supply pump is connected and connected to the water inlet of the solar water heater.

5. The sand box system for remediation of simulated contaminated soil in a multifunctional area according to claim 1, characterized in that: An extraction well pipeline is arranged in each of the sand boxes, and an extraction hole communicating with the interior of the sand box is arranged on the extraction well pipeline.

6. The sand box system for remediation of simulated contaminated soil in a multifunctional area according to claim 1, characterized in that: The reagent injection well pipeline includes a first injection pipeline and a second injection pipeline. The lower end opening of the first injection pipeline is located in the middle of the contaminated soil in the sand box; the lower end opening of the second injection pipeline is located at the bottom of the contaminated soil in the sand box.

7. The sand box system for remediation of simulated contaminated soil in a multifunctional area according to claim 4, characterized in that: The water outlet of the waste liquid collection pretreatment barrel is connected to a waste liquid treatment system, and the waste liquid treatment system is used to treat the waste liquid, and the discharge port of the waste liquid treatment system can be connected to the heat preservation storage barrel.

8. The sand box system for remediation of simulated contaminated soil in a multifunctional area according to claim 1, characterized in that: It also includes a controller, which is communicatively connected with the water sprinkler system, the soil parameter monitoring system, the water quality parameter monitoring system, the heating unit, and the temperature monitoring system.

9. The sand box system for remediation of simulated contaminated soil in a multifunctional area according to claim 1, characterized in that: A platform is arranged above each of the sand boxes, a guardrail is arranged around the platform, and a staircase is arranged between the platform and the ground.

10. The sand box system for remediation of simulated contaminated soil in a multifunctional area according to claim 1, characterized in that: At least one side wall of the sand box is made of transparent material.

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