CN105013806B - An integrated and comprehensive soil in situ joint restoration equipment - Google Patents

Abstract

The invention discloses integrated comprehensive soil in-situ ex-situ combined remediation equipment, and belongs to the technical field of soil remediation. The equipment mainly comprises an upper/lower feeder, a heating drying channel, a conveying belt, a vacuum pump, a pulverizer, a mixer, a solid medicament dosing tank, a Venturi conveying pump, an ultrasonic atomizer, a peristaltic pump, a liquid medicament storage tank, a leaching device, an activated carbon adsorption purification tank, an electromagnetic sludge discharge valve and an absorbent storage tank. The whole set of the repairing equipment adopts a modular design, and can be flexibly matched and combined according to different types of soil pollution to be repaired so as to reduce the cost. The whole set of equipment can also be arranged on a trailer to realize mobile operation. The device has multiple repairing functions of thermal desorption treatment, chemical oxidation/reduction, chemical leaching and the like, can realize in-situ ex-situ combined repair of soil containing organic pollutants and heavy metal combined pollution, and has the advantages of high repairing efficiency, wide range, no harmful gas emission, safety and environmental protection.

Description

An integrated and comprehensive soil in situ joint restoration equipment

technical field

The invention relates to the field of soil remediation technology, specifically, it is a comprehensive soil in-situ joint repair equipment integrating heat treatment, chemical oxidation/reduction, and chemical leaching technology, which can realize the treatment of organic pollutants and heavy metal pollutants. heterotopic joint remediation of soil.

Background technique

Soil is one of the main resources that human beings rely on for survival. In my country, with the acceleration of industrialization, urbanization, and rural intensification in the past 20 years, the problem of soil pollution has become increasingly prominent, and the area of soil polluted to varying degrees is constantly expanding. , posing a threat to the strategic goal of building a well-off society in an all-round way and realizing sustainable development. The main causes of soil pollution are the irrational development of mineral resources and their smelting discharge, long-term sewage irrigation and sludge application to the soil, atmospheric deposition caused by human activities, and the abuse of chemical fertilizers and pesticides. Soil pollution mainly includes various types such as heavy metal pollution, pesticides and organic pollutants. It has the characteristics of concealment, toxicity, accumulation, long-term, diversity and hysteresis. Severe soil pollution not only affects soil quality and land productivity, Moreover, it also leads to a decline in the quality of water bodies and atmospheric environments, and more seriously, it will directly endanger food safety, human health and even ecological safety. Faced with the increasingly serious problem of soil pollution, soil pollution remediation has become an important scientific and technological field that many countries and regions pay attention to, and regard it as an indispensable technical means to eliminate pollutants and restore soil ecological functions.

At present, the methods of soil remediation at home and abroad mainly include physical remediation, chemical remediation and biological remediation. According to different remediation methods, remediation technologies can be divided into in-situ remediation and ex-situ remediation. Although the in-situ repair method has good economic benefits, it has a long repair cycle for many compound-contaminated soils, and it is difficult to meet the requirements of rapid repair of urban soil in my country, which limits its application scope; the ex-situ repair method can be operated continuously and finely, and the environment The impact is small, the repair cycle is short, and it is easy to achieve a more thorough repair, but the requirements for repair equipment are higher. Thermal desorption and chemical oxidation/reduction are currently the most popular ex-situ soil remediation technologies with moderate cost. They have the advantages of short remediation period, high efficiency, easy operation, and reusable soil after remediation. For some heavily polluted soil It also needs to go through the step of chemical washing to complete the repair.

At present, there are very few professional soil remediation equipment developed in China, and most of them have relatively single functions. Generally, only one remediation method can be realized, which lacks systematization. Such as the patent application publication number is CN103286122A, the name is a kind of persistent organic pollution site leaching repair engineering equipment; A specialized equipment developed by a method; the patent application publication number is CN102764755A, and the name is a continuous microwave soil remediation device, which mainly realizes the function of rapid thermal desorption. However, the complexity of site pollution, such as many types of pollutants, complex pollution, and complex and different soil structures, brings great challenges to site pollution remediation. A single remediation method is often limited by the characteristics of site pollution, so the development of a combination of multiple The integrated solution of restoration technology breaks through the limitations of a single restoration technology and is an important development direction for future site restoration and related professional equipment.

Contents of the invention

The purpose of the present invention is to address the deficiencies in the existing soil remediation equipment, to provide a comprehensive soil in-situ joint remediation equipment integrating heat collection and desorption treatment, chemical oxidation/reduction, and chemical leaching technology, which can realize Ex-situ joint remediation of soils containing organic and heavy metal pollutants.

The purpose of the present invention can be achieved through the following technical solutions: integrated comprehensive soil in situ joint restoration equipment, characterized in that the equipment includes loading/unloading machines, heating drying tunnels, conveyor belts, vacuum pumps, pulverizers, mixing device, solid medicament dosing tank, Venturi delivery pump, ultrasonic atomizer, peristaltic pump, liquid medicament storage tank, leaching device, activated carbon adsorption purification tank, electromagnetic mud discharge valve and absorbent storage tank. There are 3 sets of loading/unloading machines and conveyor belts; 2 sets of heating and drying tunnels. The first loading/unloading machine is used for loading materials, connected to the first conveyor belt and the outlet is placed on it; the first conveyor belt passes through the first heating tunnel and is connected to the pulverizer, and the pulverizer is located below it; the pulverizer outlet Connected to the second loading/unloading machine, which is also used for feeding; the second loading/unloading machine is connected to the mixer, and the outlet is placed on it, and at the same time, the upper side inlet of the mixer is connected to Venturi conveying The outlet of the pump is connected to the solid medicament dosing tank at the upper inlet of the Venturi delivery pump, and the solid medicament dosing tank is located above the Venturi delivery pump; the lower side inlet of the mixer is connected to the liquid medicament storage tank through a peristaltic pump; The second conveyor belt is located below the outlet of the mixer, and passes through the second heating tunnel above the third conveyor belt; the third conveyor belt passes through the shower chamber of the rinser, and the outlet below the rinser is connected to the inlet of the activated carbon adsorption purification tank. The latter is located below the former, and the outlet of the activated carbon adsorption and purification tank is connected to the inlet of the eluent washing chamber through a peristaltic pump to realize the recycling of eluent; the third loading/unloading machine is located under the third conveyor belt as the lower The feeder is used to convey the soil to a wider range.

The conveyor belt material is made of dense corrosion-resistant metal mesh, which can withstand high temperature and high humidity, and is air-permeable and water-permeable.

The heating and drying tunnel is open except for the part where the conveyor belt passes through, and the rest of the structures are closed, and there is a centralized air extraction port above the drying tunnel.

The suction ports of the first heating drying tunnel and the second heating drying tunnel are connected to the inlet of the vacuum pump, and the outlet of the vacuum pump is connected to the absorption and filtration module, so that the extracted organic pollutant gas can be completely absorbed by the absorption and filtration module, and stored in the absorption and filtration module. Organic absorbent or porous adsorbent material.

Above the interior of the mixer, a vibrating dispersing screen is provided, which can make the soil particles dropped by the feeding machine evenly distributed and fall in the mixer; the upper and outer sides of the mixer are provided with a solid agent injection port, connected to the Venturi delivery pump, and the lower There is a liquid agent pump inlet on the outside, which is connected to a peristaltic pump for inputting liquid agents; the middle wall of the mixer is a double-layer hollow structure, and many needle-shaped nozzles are evenly distributed on the inner wall, which can evenly spray liquid agents into the mixer; An ultrasonic atomizer is installed on the outside of the wall in the middle of the mixer body, which can atomize the droplets sprayed by the nozzle, so that the soil and the liquid medicine can be further fully mixed, and the utilization rate of the medicine and the thoroughness of the repair can be improved.

The upper half of the rinsing chamber of the elutriator is provided with a rinsing nozzle, and the lower part is provided with a eluent collection area. The soil sent in is rinsed in the first half of the rinsing chamber to remove heavy metal pollutants. The process realizes the sufficient separation of the eluent.

An electromagnetic mud discharge valve is installed below the inlet section of the activated carbon adsorption purification tank, which is used to automatically discharge the mud containing a large amount of polluted sediments regularly and collect them for centralized treatment.

Each component of the repair equipment adopts a modular design, which is convenient for disassembly and assembly, and can be flexibly matched according to the different types of soil pollution to be repaired, and unnecessary repair steps are removed to reduce costs.

The whole set of repair equipment can be installed on a trailer to realize mobile operation.

The beneficial effects of the present invention are:

1. It has multiple repair functions such as thermal desorption treatment, chemical oxidation, chemical leaching, etc., and can realize heterotopic continuous joint repair of soil containing volatile organic pollutants and heavy metal pollutants, with high repair efficiency, wide range and continuity powerful;

2. The volatile gas of pollutants has been absorbed and processed, and there is no harmful gas emission, which is safe and environmentally friendly;

3. During the repair process, the soil is first heat-treated and then dispersed, followed by further heat treatment, which solves the problem of difficult dispersion of cohesive agglomerated soil and incomplete repair, and the repair process is not affected by wet weather;

4. The vibrating screen is used to disperse the soil material for the second time, the Venturi pump sprays the solid agent, and the ultrasonic atomization disperses the liquid agent to ensure the full mixing of the soil and the agent, reducing the amount of the drug, making the repair more thorough and cheaper;

5. Using the activated carbon adsorption purification tank to absorb and treat the chemical eluent, the online recycling of the eluent is realized, which further improves the efficiency and reduces the cost;

Description of drawings

Figure 1 is a schematic structural diagram of soil remediation equipment that integrates three remediation functions of thermal treatment, chemical oxidation/reduction, and chemical leaching; Figure 2 is a schematic structural diagram of mobile soil remediation equipment that integrates thermal treatment, chemical oxidation/reduction, and two remediation functions. The labels in the drawings are: 1. Loading/unloading machine, 2. Absorption and filtration module, 3. Conveyor belt, 4. Electric heater, 5. Heating oven, 6. Vacuum pump, 7. Pulverizer, 8. Mixer, 9. Vibrating dispersing screen, 10. Solid drug dosing tank, 11. Venturi delivery pump, 12. Ultrasonic atomizer, 13. Cavity in the mixer, 14. Liquid drug storage tank, 15. Peristaltic pump, 16. Conveyor belt metal mesh crawler, 17. Laundry device, 18. Eluent collection chamber, 19. Activated carbon adsorption purification tank, 20. Activated carbon adsorbent, 21. Electromagnetic mud discharge valve, 22. Trailer.

detailed description

The present invention will be further described below in conjunction with specific implementation examples.

The specific implementation examples are as follows:

Implementation example one:

As shown in Figure 1, the integrated and comprehensive soil in-situ joint restoration equipment can realize three restoration functions: heat treatment, chemical oxidation/reduction, and chemical leaching, including loading/unloading machine 1, heating and drying tunnel 5, and conveyor belt 3. Vacuum pump 6, pulverizer 7, mixer 8, solid drug dosing tank 10, Venturi delivery pump 11, ultrasonic atomizer 12, peristaltic pump 15, liquid drug storage tank 14, rinser 17, activated carbon adsorption purification Tank 19, electromagnetic mud discharge valve 21 and absorption filter module 2. Among them, there are 3 sets of loading/unloading machine 1 and conveyor belt 3; 2 sets of heating and drying tunnel 5. Wherein the conveyor belt metal mesh crawler 16 material of the conveyor belt 3 is made of dense corrosion-resistant metal mesh, which can withstand high temperature and high humidity, and is breathable and water-permeable; the heating and drying tunnel 5 is open except for the part where the conveyor belt passes. The structure is closed, with an electric heater 4 installed inside, and a centralized air suction port above the drying tunnel; a vibrating dispersing screen 9 is installed on the top of the mixer, a solid drug delivery port is provided on the upper side, and a liquid drug pump inlet is provided on the lower side , the middle wall of the mixer is a double-layer hollow structure, ultrasonic atomizers 12 are installed around the outside, and many needle-shaped nozzles are evenly distributed on the inner wall; the upper half of the rinsing chamber of the rinsing device 17 is provided with rinsing nozzles , a eluent collection chamber 18 is provided below; an electromagnetic discharge mud valve 21 is provided below the inlet section of the activated carbon adsorption purification tank 19, and the porous activated carbon adsorbent 20 is filled inside.

When the equipment is working, the first loading/unloading machine 1 lifts and transports the soil blank to be processed to the first conveyor belt 3, and sends it into the first heating oven 5 for baking. The temperature of the drying tunnel is between 150 and 400°C, which can initially remove volatile organic pollutants and moisture in the soil, so that the wet agglomerated soil can be dried for subsequent crushing. At the outlet of the heating drying tunnel 5, the extracted gas is pumped into the absorption filter module 2 by the vacuum pump 6. The organic absorbent is stored inside the absorption filter module, so that the extracted volatile organic pollutants can be completely absorbed by the absorbent and discharged cleanly. gas. The soil after primary heat treatment is sent into the hopper of pulverizer 7 by first conveyor belt 3 for crushing. The crushed soil is lifted and transported to the mixer 8 by the second loading/unloading machine 1, and evenly scattered by the vibrating dispersing screen 9 under the action of gravity. At the same time, the powdery solid oxidant in the solid medicament dosing tank 10 is sprayed into the soil through the Venturi delivery pump 11 at the upper side inlet of the mixer; The liquid oxidant in the mixer is transported into the hollow cavity in the middle of the mixer 8. Under the action of the ultrasonic atomizer 12 surrounding the outer periphery of the middle part of the mixer 8, the liquid oxidant droplets dropped through the needle nozzle on the inner wall of the middle part of the mixer 8 are atomized to fully mix with the falling soil. Under the action of gravity, the soil mixed with the medicament continuously falls onto the third conveyor belt 3 and is sent to the second heating tunnel 5 for heat treatment. On the one hand, it accelerates the chemical oxidation treatment rate, and on the other hand, it further removes volatile organic pollutants. . Same as the first heat treatment, the gas at the outlet of the second drying tunnel is also pumped into the absorbent storage tank 2 by the vacuum pump 6 for absorption treatment. The second conveyor belt 3 transports the heat-treated and chemically oxidized soil to the third conveyor belt 3, and the latter sends it to the rinser 17 for chemical rinse treatment to remove heavy metal pollutants. A eluent spray head is provided at the entrance area of the eluent chamber of the eluent 17 , and the chemical eluent is pumped in by the peristaltic pump 15 to spray the soil to be treated sent in by the third conveyor belt 3 . Since the conveyor belt metal mesh crawler 16 of the conveyor belt 3 is made of dense corrosion-resistant metal mesh, the reacted eluent can penetrate through the metal mesh crawler and fall into the eluent collection chamber 18 at the bottom of the rinser 17. , there is no nozzle in the outlet area of the washing chamber, and the washing liquid and the soil are further separated by standing. The separated eluate contains heavy metals and a small amount of extremely fine soil particles, and enters the activated carbon adsorption purification tank 19 under the action of gravity and the suction force of the peristaltic pump 15 . Part of the suspended microparticles contained in the eluent is deposited at the bottom at the inlet end of the activated carbon adsorption purification tank 19 under the action of gravity, and the rest enters the activated carbon adsorption area of the activated carbon adsorption purification tank 19 with the eluent, and is absorbed by the porous activated carbon adsorbent 20. Further adsorption separation to ensure that the heavy metals in the eluent are completely separated. The purified eluent is pumped into the eluent 17 again to realize recycling, and the activated carbon adsorbent in the activated carbon adsorption purification tank 19 can also be periodically taken out for activation and regeneration. The bottom of the inlet end of the activated carbon adsorption purification tank 19 is provided with an electromagnetic mud discharge valve 21, which can be opened regularly to discharge mud containing a large amount of polluted sediment for centralized treatment.

Implementation example two:

As shown in Figure 2, the integrated and comprehensive soil in-situ joint restoration equipment can realize two restoration functions: heat treatment and chemical oxidation/reduction, including loading/unloading machine 1, heating and drying tunnel 5, conveyor belt 3, and vacuum pump 6 , pulverizer 7, mixer 8, solid medicament dosing tank 10, Venturi delivery pump 11, ultrasonic atomizer 12, peristaltic pump 15, liquid medicament storage tank 14, absorption filter module 2. Among them, there are 3 sets of loading/unloading machine 1, 2 sets of conveyor belt 3 and 5 heating and drying tunnels. The whole set of restoration equipment is installed on the trailer 22 for easy movement. Among them, the track material of the conveyor belt 3 is made of dense corrosion-resistant metal mesh, which can withstand high temperature and high humidity, and is breathable and water-permeable; the heating and drying tunnel 5, except for the part where the conveyor belt passes through is open, the rest of the structure is closed , an electric heater 4 is installed inside, and there is a centralized air extraction port above the drying tunnel; a vibrating dispersing screen 9 is arranged on the top of the mixer, a solid drug delivery port is provided on the upper outer side, a liquid drug pump inlet is provided on the lower outer side, and the middle part of the mixer The wall of the device is a double-layer hollow structure, ultrasonic atomizers 12 are installed around the outside, and many needle-shaped nozzles are evenly distributed on the inside wall.

When the equipment is working, firstly, the first loading/unloading machine 1 unfolds one end and puts it under the vehicle, then lifts the soil material to be processed from under the vehicle to the first conveyor belt 3, and sends it into the first heating drying tunnel 5 for drying. bake. The temperature of the drying tunnel is between 150 and 400°C, which can initially remove volatile organic pollutants and moisture in the soil, so that the wet agglomerated soil can be dried for subsequent crushing. At the outlet of the heating and drying tunnel 5, the extracted gas is pumped into the absorption filter module 2 by the vacuum pump 6. The activated carbon adsorption material is stored inside the absorption filter module, and the extracted organic pollutants are completely absorbed and filtered by the activated carbon to discharge clean gas. The soil after primary heat treatment is sent into the hopper of pulverizer 7 by first conveyor belt 3 for crushing. The crushed soil is lifted and transported to the mixer 8 by the second loading/unloading machine 1, and evenly scattered by the vibrating dispersing screen 9 under the action of gravity. At the same time, the powdery solid oxidant in the solid medicament dosing tank 10 is sprayed into the soil through the Venturi delivery pump 11 at the upper side inlet of the mixer; The liquid oxidant in the mixer is transported into the hollow cavity in the middle of the mixer 8. Under the action of the ultrasonic atomizer 12 surrounding the outer periphery of the middle part of the mixer 8, the liquid oxidant droplets dropped through the needle nozzle on the inner wall of the middle part of the mixer 8 are atomized to fully mix with the falling soil. Under the action of gravity, the soil mixed with the medicament continuously falls onto the second conveyor belt 3, and is sent to the second heating oven 5 for heat treatment, on the one hand, to accelerate the rate of chemical oxidation/reduction treatment, and on the other hand, to further remove organic pollutants . Like the first heat treatment, the gas at the outlet of the second drying tunnel is also pumped into the absorption filter module 2 by the vacuum pump 6 for treatment. Finally, the treated soil is transported to a suitable place under the vehicle through the third loading/unloading machine 1.

The above-described embodiments are only preferred specific implementations provided for better explaining the present invention, and the replacement of process steps performed by those skilled in the art within the scope of the scheme should be included in the protection scope of the present invention.

Claims (9)

1. a kind of integrated synthesis soil original place dystopy combines repaired item, it is characterised in that the equipment include up/down material machine, Heating drying tunnel, conveyer belt, vavuum pump, grinder, blender, solid chemicals grug feeding jar, venturi delivery pump, ultrasonic atomization Device, peristaltic pump, liquid preparation holding vessel, leaching device, charcoal absorption purification pot, electromagnetism spoil disposal slurry valve and absorbing and filtering mould Block；Up/down material machine, conveyer belt respectively have 3 sets, 2 sets of heating drying tunnel；First up/down material machine is used for feeding, is connected to first conveyer belt And export placed on it；First conveyer belt is connected to grinder through the first heating drying tunnel, and grinder is disposed below；Crush Device outlet is connected to the second up/down material machine, and the latter is also to be used as feeding；Second up/down material machine is connected to blender, and goes out Mouth is placed on it, meanwhile, the upper side entrance of blender is connected to the outlet of venturi delivery pump, in the upper of venturi delivery pump Entrance is connected to solid chemicals grug feeding jar, and solid chemicals grug feeding jar is located at the top of venturi delivery pump；The downside of blender Entrance is connected to liquid preparation holding vessel by peristaltic pump；Second conveyer belt is located at below mixer outlet, and adds through second Hot drying tunnel is located above the 3rd conveyer belt；3rd conveyer belt passes through the elution room of leaching device, and leaching device lower exit port is connected to work Property charcoal adsorption cleaning tank entrance, the latter is located at the former lower section, and the outlet of charcoal absorption purification pot passes through peristaltic pump and leaching device Elution chamber inlet be connected, realize the recycling of leacheate；3rd up/down material machine is located at below the 3rd conveyer belt, as under Material machine uses.

A kind of 2. integrated synthesis soil original place dystopy joint repaired item according to claim 1, it is characterised in that：Institute It is that fine and close corrosion resistant metal net is formed to state conveyer belt track material, can bear high temperature, high humidity, and breathe freely, be permeable.

A kind of 3. integrated synthesis soil original place dystopy joint repaired item according to claim 1, it is characterised in that：It is described Heating drying tunnel is unlimited except the part that conveyer belt passes through, and remaining structure is all closing, has concentration bleeding point above drying tunnel.

A kind of 4. integrated synthesis soil original place dystopy joint repaired item according to claim 1, it is characterised in that：It is described The bleeding point of first heating drying tunnel and the second heating drying tunnel is connected with vacuum pump inlet, the outlet connection absorbing and filtering mould of vavuum pump The entrance of block.

A kind of 5. integrated synthesis soil original place dystopy joint repaired item according to claim 1, it is characterised in that：It is described The inner upper of blender, it is provided with vibration dispersion sieve；The upper outside of blender is provided with solid chemicals dispensing port, connects venturi Delivery pump, lower outside are provided with liquid preparation pump intake, peristaltic pump are connected, for infusion fluid medicament；The middle part wall of blender It is double layer hollow structure, madial wall is evenly distributed with many needle-like shower nozzles；Ultrasonic wave is installed on the outside of wall in the middle part of mixing body Atomizer.

A kind of 6. integrated synthesis soil original place dystopy joint repaired item according to claim 1, it is characterised in that：It is described The top half region of the elution room of leaching device is provided with elution shower nozzle, and lower section is provided with leacheate collecting region.

A kind of 7. integrated synthesis soil original place dystopy joint repaired item according to claim 1, it is characterised in that：It is described Electromagnetism spoil disposal slurry valve is provided with below the entrance of charcoal absorption purification pot.

A kind of 8. integrated synthesis soil original place dystopy joint repaired item according to claim 1, it is characterised in that：It is a whole set of Each part of repaired item uses modularized design, can be according to the difference of soil pollution species to be repaired, flexible matched combined.

A kind of 9. integrated synthesis soil original place dystopy joint repaired item according to claim 1, it is characterised in that：It is a whole set of Equipment may be mounted on trailer, realize mobile operation.