65 results about "Non-aqueous phase liquid" patented technology

Characterization of organic contaminants in subsurface formation is performed by methods for detecting the presence of nonaqueous phase liquid in a subsurface formation, and for determining the composition and for determining the volume of nonaqueous phase liquids. Generally the methods comprise introducing one or more partitioning tracers and one or more non-partitioning tracers at one or more injection points located in the subsurface formation and measuring separation between the one or more partitioning tracers and the one or more non-partitioning tracers from one or more sampling points located in the subsurface formation to determine presence, composition and/or volume of nonaqueous phase liquid in the subsurface formation. In addition, the methods can be used to assess the performance of an attempted remediation.

A zero-valent metal emulsion is used to dehalogenate solvents, such as pooled dense non-aqueous phase liquids (DNAPLs), including trichloroethylene (TCE). The zero-valent metal emulsion contains zero-valent metal particles, a surfactant, oil and water. The preferred zero-valent metal particles are nanoscale and microscale zero-valent iron particles.

The invention relates to an organic-polluted soil restoration method. Excavated polluted soil is divided into two types of soil, the first type of the soil contains non-aqueous phase liquid and the second type of the soil does not contain non-aqueous phase liquid. The method comprises the following steps of carrying out crushing and screening on the polluted soil containing non-aqueous phase liquid by a crushing-screening combined device, simultaneously, carrying out flushing pre-treatment by a surfactant, uniformly spreading and stacking all the polluted soil subjected to crushing and screening in an enclosed greenhouse, heating the polluted soil to a temperature of 80-100 DEG C by a geothermal system at the lower part of the polluted soil, keeping the temperature of the heated polluted soil in a range of 80-100 DEG C for 2-4h, then spraying a first oxidizing agent to the polluted soil by a spraying system in the enclosed greenhouse, then carrying out heating treatment on the polluted soil to a temperature of 60-80 DEG C and keeping the temperature for 6-10h.

The invention discloses a method for quantitatively monitoring a DNAPL (Dense Nonaqueous Phase Liquid) migration process and the saturation degree. According to the method, an infiltration test of DNAPL is carried out in a two-dimensional sand box and a light transmission method and a high-density resistivity method are used for dynamically monitoring; a CCD (Charge Coupled Device) camera and an LCR (Inductance, Capacitance and Resistance) digital electric bridge are respectively used for acquiring data. A calculation formula of the DNAPL saturation degree in water-DNAPL two phases is used for processing the data of the light transmission method. The data processing of the high-density resistivity method is to convert resistance value data into a resistivity value and utilize an Archie formula to obtain saturation degree space distribution of heavy non-aqueous phase liquid. In the Archie formula, a parameter beta value is obtained by a novel method combined with the light transmission method and the total amount of the DNAPL injected into the sand box can be evaluated by the saturation degree space distribution of different moments; then the total amount is compared with an actually-measured infiltration capacity. A result shows that an infiltration process of the DNAPL in a saturated pore medium can be quantitatively monitored and the estimated DNAPL infiltration capacity is matched with an actually-measured value very well.

The invention discloses an electric power control and repairing system and an electric power control and repairing method of nonaqueous phase liquid pollutants in soil. The electric power control and repairing system consists of an electrode well, a conductive electrode, an insulating electrode, a power supply control system as well as an injected liquid mixing device, an injection pump, an injection well and a sucking well. Aiming at nonaqueous phase liquid pollution of soil, a non-uniform fragrance variable electric field is applied, together with the solubilization of a surfactant, electroosmosis, electrophoresis and dielectrophoresis effects as migration driving power of pollutants are applied to nonaqueous phase liquid pollutants, and the migration direction of the nonaqueous phase liquid pollutants in soil can be changed and controlled, so that the purposes of solubilization, migration control and final enrichment and removal of the nonaqueous phase liquid pollutants in soil and underground water are achieved. In addition, the electric power control and repairing system and the electric power control and repairing method can be also used for controlling the pollution range of nonaqueous phase liquids to be within or outside a specific spatial area.

Compositions and methods are provided for oxidizing subsurface contaminants. Compositions include compatible combinations of surfactants, cosolvents and chemical oxidants. Compositions have been identified that provide compatible combinations of surfactants and chemical oxidants that maximize oxidant productivity on solubilized contaminants. The compositions and methods are especially effective on the treatment of dense non-aqueous phase liquids or DNAPLs.

The invention discloses a 3D printed water-permeable pavement scale simulation device under the action of runoff. The device comprises a model box provided with an opening in the top, wherein a lower base course, an upper base course and a 3D printed water-permeable pavement are sequentially inside the model box from bottom to top, and the water-permeable pavement is transparent or translucent; and a section is obtained by scanning the concrete water-permeable pavement, and is reconstructed in a 3D printer to obtain the 3D printed water-permeable pavement, and a seepage port is formed in the bottom of the model box and is communicated with a collector. The interaction among rainwater runoff, sediment particles and the water-permeable pavement is studied comprehensively through a non-aqueous phase liquid migration law test and a non-aqueous liquid-wrapped sand transport law test to give the variation trend of movement speeds of the non-aqueous liquid and particles in a pore channel in each direction at different seepage flow velocities, and the experimental effect has good guiding significance.

A dedicated liquid level detection method having a sensor positioned into the casing of a groundwater well. The detector is in the form of an elongated thin film sensor tape that extends along the full length of the well casing which detects the level, thickness and volume of both groundwater and any light or dense non-aqueous phase liquid that may be present.

This is accomplished through the use of a conductive and hydrostatic resistive circuit measuring the level of liquids in a groundwater well at one hundredths of foot resolution or greater. Once the elongated sensor is installed, liquid levels can be gauged from the surface. The data is stored using a battery operated hand held digital display temporarily connected at the top well section casing. Since a sensor probe is not lowered into the well, cross contamination between wells is eliminated.

A method and apparatus for measuring in situ flow of non-aqueous phase liquids (NAPLs) through a porous medium is described. A tracer is introduced into a well or boring located in the medium and the tracer concentration in the well kept uniform by mixing. The rate at which the tracer is depleted from the well has been determined to be proportional to the flow rate of the NAPL through the well or boring and surrounding formation.

The application relates to a sustainable and green remedial approach for in situ remediation. The system and method use directionally drilled horizontal wells filled with granular reactive media generally installed in the direction of groundwater flow for groundwater remediation. “Flow-focusing” behavior is leveraged to capture and passively treat proportionally large volumes of groundwater in situ. The system and method perform well in low hydraulic conductivity environments where the success of other in situ remediation methods is controlled by aquifer injectability. Reactive media are selected according to the contaminants to be treated and site characteristics. Energy conservation and other considerations result in considerable cost savings compared to current in situ remediation systems. Also disclosed is a source area bypass system comprising one or more horizontal wells, constructed in a manner to allow unimpacted or cleaner groundwater to bypass a nonaqueous phase liquid zone or high-concentration source area of contamination and discharge downgradient. Reactive media may or may not be used in a source area bypass system. In some configurations, groundwater pumps may be installed to enhance performance. Core elements of green remediation according to the United States Environmental Protection Agency are achieved.

The invention relates to a sampling well system for investigation and long-term monitoring of an organic contaminated site, and a well building method thereof. The sampling well system can be used forsampling a soil gas, a light non-aqueous phase liquid (LNAPLs) layer, a dense non-aqueous phase liquid (DNAPLs) layer and underground water of the stratum at different depths respectively in three stages of site investigation, treatment and restoration, and subsequent monitoring. For the organic contaminated site, the sampling well system has the function of sampling various kinds of contamination media in different stages by means of one monitoring well, reduces the building and maintenance costs of the sampling well, and improves the efficiency.

Provided is a method for degrading heavy non-aqueous phase liquid component composite hydrochloric ether pollutants in underground water. The steps are as follows: a mixture of sodium persulfate and sodium hydroxide is added into water containing composite hydrochloric ether pollutants, and degradation and restoration are carried out. The cost is low, and operation is simple, safe and practicable. The restoration reagent has stable chemical properties, the reaction conditions are mild, and the restoration reagent has universality in most of underground environments. Various hydrochloric ether kinds can be degraded, and have a representativeness of pollution of underground water by composite hydrochloric ether. The method has characteristics of high degradation efficiency, rapid degradation rate, nontoxic products and the like. The method is suitable for in-situ restoration of underground water composite hydrochloric ether pollutants, can be extended for restoration composite hydrochloric ether in soil or industrial waste water, and is widely applied.

The invention discloses an in-situ continuous penetrating probe used in non-aqueous phase liquids (NAPLs) polluted sandy soil field investigation. A time-domain reflective penetrating probe is mounted between a feeler lever and a friction barrel of a traditional static penetrometer. The structure of the time-domain reflective penetrating probe is that six symmetrical stainless steel needles are embedded in an outer surface of a hollow Derlin pole and are fixed on the Derlin pole through bolts, two coaxial cable inner conductors are respectively welded with a pair of bolts which are positioned on the top of the Derlin pole and penetrates through the diameter of the Derlin pole, and two adjacent bolts on two sides of the pair of bolts are form a group and are welded with coaxial cable outer conductors respectively. The penetrating probe is capable of acquiring dielectric constants, conductivities, tie resistances and side frictions of soil layers of different depth quickly, continuously and accurately. According to the electricity parameters and the mechanical parameters, polluted area and pollution degree of the NAPLs polluted sandy soil field are identified. The in-situ continuous penetrating probe provides a powerful tool in fast screening NAPLs polluted field.

The invention provides a system for testing migration and obstruction of non-aqueous phase liquid pollutants in underground water. The system comprises a test soil sample chamber, a uniform variable speed sewage supply module, a water supply module and a solution collection module, wherein the test soil sample chamber at least comprises a first sand tank, a second sand tank and an engineering barrier isolation tank which are arranged in sequence and provided with a water permeable structure therebetween; and the uniform variable speed sewage supply module is communicated with the first sand tank, the water supply module is communicated with the bottom end of the first sand tank, and the solution collection module is arranged at the bottom ends of the engineering barrier isolation tank andthe second sand tank. According to the scheme, the migration and diffusion of non-aqueous phase liquid pollutants in the stratum can be simulated according to different geological conditions and different working conditions on site; the migration and distribution characteristics of the non-aqueous phase pollutants in porous media with different particle sizes are studied; and meanwhile, the isolation, resistance and control effects of an engineering barrier isolation wall on pollution plumes generated after migration and diffusion of the non-aqueous phase liquid pollutants in an underground environment can be systematically studied.

A water treatment method that concurrently subjects water to: (1) a biological water treatment process that removes a first set of organic materials from the water and (2) a physical water treatment process that removes a second set of organic materials from the water. A water treatment system that concurrently removes aqueous phase organic materials from water using a biological removal system that includes microorganisms and a physical separation system that includes sparging equipment for sparging the water to remove non-aqueous phase liquid organic materials, volatile phase organic materials.

Devices and methods for directing a non-aqueous phase liquid (NAPL) that migrate entrained in a fluid (e.g., a gas) from sediments in bodies of water by using trapping caps having an upwardly sloped surface toward an accumulation zone that contains a water table, in which migration of the gas carries the NAPL toward the accumulation zone.

The invention disclosed relates to a method and apparatus for recovering non-aqueous phase liquids (NAPL) from regions below ground where NAPL spills are sources of aquifer contamination. The apparatus includes a system to supply gas-supersaturated liquid, a system of ground wells in fluid communication with the contaminated ground water region (source of contamination) and with an above-ground NAPL recovery system, said system of wells including an injection well in fluid communication with the system to supply gas-supersaturated liquid and with the contaminated region below ground, an extraction well in fluid communication with the contaminated region below ground and with the NAPL recovery system, wherein the NAPL is in the gaseous phase or gas-mobilized non-volatile liquid phase or both, and a pump for delivering the gas-supersaturated liquid to the vicinity of the contaminated region below ground.

The invention discloses a method for evaluating the migration characteristic of pollutants in a no-filling rough single fracture. The method concretely comprises the following steps: determining the kind and the dissolvability of the pollutants; establishing a rough single fracture model by using a fractal theory; establishing a no-filling rough single fracture value model based on a finite element technology; evaluating the migration process of the pollutants in the fracture by using a convection-dispersion equation for soluble pollutants; and evaluating the migration process of the pollutants in the fracture by using a level set technology for non-aqueous phase liquid pollutants. The method has the following advantages: 1, evaluation of the migration characteristic of the soluble pollutants in the fracture is realized; 2, evaluation of the migration characteristic of the non-aqueous phase liquid pollutants in the fracture is realized; and 3, migration parameters of the pollutants in the fracture, obtained in the invention, can be used as underground water pollution repairing base parameters.

A method for treating LNAPL source zones using a cost effective LNAPL source zone technology to degrade residual LNAPL, by introducing bioremediation amendments comprising nutritional supplements in quantities, locations, and depths required to stimulate and sustain the anaerobic biodegradation of an LNAPL source zone; monitoring the LNAPL source zone for adverse conditions that decrease anaerobic LNAPL biodegradation; eliminating any identified adverse conditions to sustain LNAPL biodegradation; and maintaining the water with nutritional supplements in quantities, locations, and depths required to stimulate and sustain the anaerobic biodegradation of LNAPL.