31 results about "Soil vapor extraction" patented technology

The invention discloses a method for treating contaminated soil by combining in-situ heat strengthening and a soil vapor extraction technology, which is characterized in that a heating well with a certain form is formed in a contaminated area, a heater part is provided in the heating well, and a sleeve pipe is installed, a catalyst is filled in the sleeve pipe for accelerating the high temperature decomposition of the pollutant into simple micromolecular substances. At least one well bore is drilled at the central contaminated area of the heating well which is arranged in the certain form to form an extraction well, a vacuum system is provided for realizing the extraction of the contaminated tail gas. the heating well provides heat to contaminated soil of the heating well and the adjacent areas through the thermal conductivity of the heater part arranged in the heating well, soil is heated, the soil pollutant is subjected to processes of evaporation, in-situ pyrolysis, oxidation, combustion, distillation and the like to form tail gas like simple micromolecular gas, water and pollutant steam, then the tail gas is extracted by the vacuum system in the extraction well, and is connected to a tail gas collection pipeline of the extraction well to send to the ground surface, the pollutant in tail gas is treated through a pollutant treatment facility which is installed on the ground surface. The method also comprises an impervious sealing plate which is arranged on the contaminated soil area ground surface for minimizing the gas exchange of the heating well, the extraction well and atmosphere, and preventing the pollutant from entering in atmosphere to form secondary pollution, and a thermal insulation layer is arranged above or below the impervious sealing plate for avoiding the dissipation of heat.

The invention belongs to the technical field of in-situ remediation of soil pollution, and particularly relates to a system and a method for removing organic pollutants in soil employing microwave-assisted soil vapor extraction (SVE). The method comprises the following steps: injecting a microwave-assisted material into soil to be repaired; paving an airtight cover membrane on the surface of the area of the soil to be repaired; providing one or more pumping wells in the area of the soil to be repaired; providing a plurality of air injection wells, monitoring wells and injection pipelines within a theoretical coverage range of the pumping wells. By adopting the method, a microwave is adopted as a heat source, so that various of organic pollutants in the soil are primarily processed by volatilization and decomposition mechanisms; desorption of adsorbed state organic matters in soil particles is facilitated; steam state formation of volatile organic compounds (VOCs) is accelerated; the extracted steam is processed by a ground waste gas and wastewater treatment device, so as to achieve the target of repairing the organic polluted soil. The technology has the advantages of being low in cost, strong in maneuverability, wide in range of processing organic matters, free of damage to a soil structure, free of secondary pollution and the like, can adopt standard equipment, and has a broad application prospect.

The invention belongs to the technical field of soil restoration and discloses a soil vapor extraction system based on water vapor and hot air combined injection. The system comprises a gas generationdevice for generating mixed gas of water vapor and hot air, an extraction and injection shaft device connected with the gas generation device, and a tail gas treatment device connected with the extraction and injection shaft device, wherein the extraction and injection shaft device is used for obtaining the mixed gas, injecting the mixed gas into a soil shaft and collecting mixtures of gas-phasepollutants from the soil shaft; and the tail gas treatment device collects the mixtures of the gas-phase pollutants in a centralized mode through the extraction and injection shaft device. According to the provided soil vapor extraction system based on water vapor and hot air combined injection, the restoration efficiency can be completely improved.

The invention relates to a resource tail gas treatment system and a technology for a soil vapor extraction repair technique. First, tail gas enters a gas-liquid separation tank. The back of the separation tank is connected with a vacuum pump. The tail gas enters a solvent absorption tower from the output end of the vacuum pump. Gas from which pollutants are removed is exhausted to atmosphere from the top of the absorption tower. Solvent by which the pollutants are absorbed is discharged from the bottom of the absorption tower and enters a solvent regeneration tower. The pollutants are discharged from the top of the solvent regeneration tower and enter a pollutant recovery tank after the pollutants are cooled by a condenser. The solvent is delivered by the vacuum pump from the bottom of the regeneration tower to the absorption tower for recycling after the solvent is cooled by the condenser. If high-selectivity absorbent is used under proper operating conditions, the absorption rate of volatile or semi-volatile organic pollutants in the tail gas can reach 99.99 percent, the content of organic pollutants in air can fully satisfy the national pollutant discharge standard and the trouble in tail gas treatment related to SVE oil repair is solved. Organic matters are resourced and recovered, the solvent is recycled and the regeneration rate can reach 99.999 percent above.

A well pipe provides for air sparging and soil vapor extraction for groundwater remediation at a single point of entry. An elongated well pipe is provided with a plurality of openings at an upper section and a lower section of the pipe and a packer member for separating the two sections. A conduit for delivering compressed air passes through the packer member into the lower section of the well tube for providing air sparging below the water table level in the ground and a vacuum source is connected to an upper end of the well pipe for drawing vapors from the vadose region in the ground into the pipe through the openings in the upper section of the well tube for transport on to a remediation destination. The conduit is adapted for delivery of remedial enhancing amendments into the surrounding ground through the lower section of the well pipe to further treat the contamination below the ground surface.

The invention provides a soil vapor extraction volatile organic pollutant tail gas clarification system which includes a vacuum pump, an immobilized photocatalytic pre-processing reactor and a biochar clarification device. The vacuum pump is connected to the immobilized photocatalytic pre-processing reactor and the immobilized photocatalytic pre-processing reactor is connected to the biochar clarification device. The immobilized photocatalytic pre-processing reactor is a sealed container with a substrate layer being fully covered by a photocatalytic material. An ultraviolet lamp tube is arranged in the immobilized photocatalytic pre-processing reactor. By means of combination of gas-liquid separation, photocatalytic pre-processing and biochar adsorption and clarification, volatile organic pollutant can be clarified and eliminated efficiently in a multistep manner and defect that a conventional single biological adsorbing material is poor in effect is overcome. In addition, by means of the photocatalyst immobilized on fan blades in a propeller agitator and on an inner wall of a shell body of the photocatalytic reactor, gas is stirred effectively, tail gas fully contacts and collides the photocatalysis coating so that photocatalytic degradation probability is increased.

A system and method for the accelerated decontamination of contaminated soil, vadose zone and/or groundwater is described. Contaminates are removed from soil and from the groundwater via heat injection through trenching or directionally drilled or horizontally drilled and installed delivery plumbing, pure oxygen injection through separate plumbing installed in the same manner as the plumbing used to deliver the heat, bioventing, sparging, and bioremediation, all through the oxygen delivery plumbing, and soil vapor extraction through vertical wells, all contained in one mobile treatment system. Contaminants are separated from the soil gas via filtration or oxidation. Residual contaminants in the vadose zone and/or the in the groundwater are subjected to volatilization by increased temperature via heat injection and/or oxidation via contaminant degrading microorganisms.

The invention discloses a simulating device for a soil vapor extraction technique. The simulating device for the soil vapor extraction technique comprises a three-dimensional test sand box, a vapor extraction device connected with the sand box, and a charcoal immobilization inoculums adding device. The vapor extraction device comprises an air injection pump, a flowmeter, an air injection well, an extraction well, an activated carbon filter and a vacuum pump. The charcoal immobilization inoculums adding device comprises a pressurizing injection pump and an injection well. The invention further provides the charcoal immobilization inoculums adding device and the three-dimensional test sand box. By the adoption of the simulating device, a soil vapor extraction test, a charcoal immobilization inoculums degradation test and a vapor extraction simulation test strengthen through charcoal immobilization inoculums can be conducted under a homogeneous or heterogeneous soil layer condition; various parameters which mainly include the aeration flow, the extraction flow, the vacuum degree and the like can be monitored in real time during the tests; meanwhile, sampling measurement can be conducted on soil samples or gas samples in different positions in a soil layer at different stages of the tests, and thus the repairing effect of the soil vapor extraction technique strengthen through the charcoal immobilization inoculums on a contaminated site can be determined.

A system and method for combined microorganism degradation and air sparging-soil vapor extraction (AS-AVE) of oil-containing sludge can include a microorganism-adding unit, an AS-SVE unit, a metering-feeding layer, a mixing layer, a material discharging layer and a crawler-type conveyor. In some embodiments the microorganism-adding unit and the AS-SVE unit can include a microorganism storage tank and an AS-SVE storage tank. In some embodiments, the metering-feeding layer can include a valve, a pressure gauge, a flowmeter, a feeding chamber. In some embodiments, the mixing layer can include pipeline connectors and a stirrer. In some embodiments, the material discharging layer is mainly for transporting the treated soil away. The system can remove petroleum, petroleum hydrocarbons, volatile organic compounds (VOCs), and degradable and extractable contaminants from oil-containing sludge by a method combining microorganism degradation, mechanical stirring, AS-AVE and the like, thereby achieving soil remediation and automatic treatment in a large scale.

The invention provides a tail gas treatment device for treating vapor extraction tail gas by utilizing mineralized garbage. The tail gas treatment device comprises a separation unit, an adsorption unit and a monitoring unit which are sequentially connected; the separation unit comprises a gas inlet pipe, a vacuum pump and a three-phase separator; the gas inlet pipe is a conveying pipe for conveying tail gas generated by soil vapor extraction; an inlet of the vacuum pump is connected with the gas inlet pipe; an outlet of the vacuum pump is connected with a gas inlet of the three-phase separatorthrough a pipeline; the bottom of the three-phase separator is provided with a wastewater outlet and a waste oil outlet; the adsorption unit comprises an adsorption tower, wherein a filler in the adsorption tower is mineralized garbage; the bottom of the adsorption tower is provided with an adsorption tower gas inlet; the adsorption tower air inlet is butted with a gas outlet of the three-phase separator; the top of the adsorption tower is provided with an adsorption tower gas outlet; and the adsorption tower gas outlet is connected with a gas outlet pipe. The device has the advantages of high efficiency, low cost, stable operation and the like. Meanwhile, mineralized garbage can be changed into valuables, and stored garbage of landfill can be reduced.

The invention provides a method for treating vapor extraction tail gas by utilizing a bioremediation agent. The method comprises the following steps: (1) introducing tail gas from soil vapor extraction into a gas-liquid separation tank, and introducing tail gas from gas-liquid separation into a solvent treatment pool; (2) treating the tail gas with a bioremediation agent in the solvent treatment pool and introducing the gas with pollutant removed into an acid and alkali treatment pool from the top of the solvent treatment pool; and (3) subjecting the gas to 10M sulfuric acid solution, 10M solution of sodium hydroxide and water absorption and discharging the gas into the atmosphere from the top of the treatment pool. The invention has the advantages of simple design, convenient operation, no sophisticated processing equipment, low cost, thorough treatment and no secondary pollution.

The invention provides a solar ventilation system device for remediation of a contaminated site. The device comprises a solar power supply control system, and an aeration system and an air extraction system, which are distributed in a soil remediation area, wherein the solar power supply control system is used for collecting solar energy and discharging the solar energy to the aeration system and the air extraction system for use; the aeration system is used for delivering air to the soil remediation area; the air extraction system is used for extracting organic contaminants from the soil remediation area. According to the device, the solar energy is adopted for power generation, so that electric energy is effectively saved, and constraints of cost such as the landform and electric wires are broken; soil vapor extraction and ventilation remediation technologies are coupled to rapidly and effectively remove volatile organic matters and biodegradable organic matters in soil; the soil can be safely reutilized after quality improvement and purification; the device is convenient to mount, wide in application range, flexible in operation, lower in running cost and free of secondary pollution.

The invention discloses a prefabricated vertical drain-in situ soil vapor extraction (PVDs-SVE) repairing device and method. The device comprises an extraction assembly, a gas injection assembly and atail gas treatment assembly; the extraction assembly comprises extraction-PVDs, a first ground pipeline and a vacuum pump, and the vacuum pump extracts pollutants adsorbed by the extraction-PVDs through a second ground pipeline, and conveys the pollutants into activated carbon columns of the tail gas treatment assembly for treating; and the gas injection assembly comprises an air compressor, gasinjection-PVDs and the second ground pipeline, and the air compressor delivers air to the gas injection-PVDs through the second ground pipeline. The PVDs-SVE repairing device has the obvious improvingeffect on vapor extraction of a low-permeability soil layer, meanwhile, has the advantages of superior drainage performance, economical performance, practicality, high applicability and the like, andhas the great application prospects in the aspect of repairing and treating of volatile organic contaminated soil.

The invention provides a method for restoring soil by steam extraction. The method for repairing soil by steam extraction method of the present invention includes the following steps: (1) arranging steam pipes that are staggered horizontally and vertically in the soil to be repaired; (2) mixing and heating water and alcohol in a ratio of 3:1 to produce steam and pass it into the Step (1) In the arranged steam pipeline; (3) The steam is kept warm and ventilated for 30-60 minutes. The invention has good soil remediation effect and can effectively avoid secondary pollution.

The invention discloses a movable soil gas phase extraction treatment device. The device comprises a gas extraction system, a gas-liquid separation system and a tail gas treatment system, every two adjacent gas extraction system, gas-liquid separation system and tail gas treatment system communicate with each other, a hydraulic cylinder is fixedly connected to the front end of a vehicle body, the output end of the hydraulic cylinder is in transmission connection with a treatment cylinder and a lifting cylinder, the top ends of the treatment cylinder and the lifting cylinder are communicated through a connecting pipe, and a first screw rod and a second screw rod are rotationally connected to the interiors of the treatment cylinder and the lifting cylinder respectively. According to the device, the two screw rods in the lifting cylinder and the treatment cylinder are matched with each other, so that external soil is conveyed into the treatment cylinder to be subjected to vapor extraction treatment; and the two screw rods in the lifting cylinder and the treatment cylinder are reversely matched, the soil in the treatment cylinder is backfilled, recovery of an extraction area is completed, after the device completes one-time extraction, subsequent gas phase extraction operation in different areas can be carried out, and the convenience of the device is improved.

The invention relates to the field of soil contamination treatment, in particular to a soil vapor extraction and remediation system. An air inlet pipe of an absorption tower is connected with an intake sucking pump. An air outlet pipe of the absorption tower is connected with an air inlet of a water vapor separation device. An air outlet of the water vapor separation device is connected with an air inlet of a packing absorption device. An air outlet of the packing absorption device is connected with an induced draft fan through a pipeline. The induced draft fan is connected with an exhaust cylinder. A spiral piece is arranged in the absorption tower. The spiral piece is of a double-layer hollow structure. Nozzles are distributed on the lower surface of the spiral piece. A hollow part of the spiral piece is connected with a spray liquid water inlet pipe. The bottom of the absorption tower is connected with the air inlet pipe, and the top of the absorption tower is connected with the air outlet pipe. According to the soil vapor extraction and remediation system, the spray and absorption effects are improved through the spiral type absorption tower, and the extracted air treatment effect is improved; and meanwhile a rotary packing block is divided into four blocks which are used in turn and cleaned, and no disassembly is needed, so that the equipment can operate continuously and normally.