50 results about "Hydrocarbon contamination" patented technology

An apparatus for cleaning the specimen and interior specimen chamber of Transmission Electron Microscopes, and similar electron- or charged-particle-beam instruments consisting of a plasma cleaning device mounted on a hollow rod that replaces the stage through the air lock of the instrument by being the same shape and size as the stage support rod. The plasma cleaning device is a small hollow cathode that is excited by RF power. Air or other oxygen containing mixtures is admitted to the plasma through the hollow rod at a pressure below 1 Torr. The plasma creates oxygen radicals from the oxygen containing gas. The oxygen radicals oxidize the hydrocarbons contamination and convert them to easily pumped gases. The apparatus can be attached to the electron microscope whenever cleaning is needed, and then is easily removed to return the instrument to its analytical function.

A composition of an aqueous, an aqueous acid, and an aqueous alkaline foaming additive (“foamer”) functions in a wide pH range and under conditions of salt, alcohol, and hydrocarbon contamination. The foaming additive (“foamer”) composition includes a mixture of a salt of an alkyl ether sulfate surfactant, a polymer or combination of polymers, and either a water miscible solvent for the liquid foamer additive or a silicon compound for a substantially anhydrous foamer additive.

A composition of an aqueous, an aqueous acid, and an aqueous alkaline foaming additive (“foamer”) functions in a wide pH range and under conditions of salt, alcohol, and hydrocarbon contamination. The foaming additive (“foamer”) composition includes a mixture of a salt of an alkyl ether sulfate surfactant, a polymer or combination of polymers, and either a water miscible solvent for the liquid foamer additive or a silicon compound for a substantially anhydrous foamer additive.

The invention belongs to the field of soil remediation, and discloses a combined restoration method of polycyclic aromatic hydrocarbon polluted soil, which comprises the following steps: (1) putting polycyclic aromatic hydrocarbon polluted soil in a bioreactor, adding water at room temperature, and stirring; (2) adding 5-30U of subtilisin to every gram soil of into the bioreactor, and stirring at 30 rpm; (3) while stirring, adding sodium palmitate and methyl palmitate into the bioreactor, and continuing stirring, wherein the sodium palmitate accounts for 3.5-5 wt% of the soil, and the methyl palmitate accounts for 0.8-1.6 wt% of the soil; and (4) adding cotton straw powder into the bioreactor (the cotton straw powder accounts for 1.5-4.5 wt%), continuing stirring for 2 hours, standing, separating the soil from water, and drying to obtain the remediated soil.

Methods for identifying hydrocarbon contamination sources may include fingerprinting hydrocarbons using isotopocule analyses for BTEX compounds. For example, methods for identifying hydrocarbon contamination sources may comprise: extracting BTEX compounds from a sample; measuring the isotopocule composition of the BTEX compounds; and determining a characteristic of the sample based on the isotopocule composition. Such characteristics may include, but are not limited to, the characteristic of the sample comprises one or more selected from the group consisting of: a source of the sample, a condition at which the sample formed or was last equilibrated, a migration time from a source to a sample location, weathering of the sample, and degree to which the sample is anthropogenic and naturally-occurring.

The invention discloses a marine surfactant-producing bacterial strain. The bacterial strain belongs to Salinicolasp., and is preserved on October 29th,2012 with the preservation name of Salinicolasp.LHOD-1 and the preservation serial number of CGMCC No.6715 in China General Microbiological Culture Collection Center (CGMCC). The bacterial strain has the ability of producing surfactant, has stronger emulsion effect to petroleum hydrocarbon contamination in seas, can help to remove the petroleum hydrocarbon contamination in sea water, and has no positioning and pathogenic action to mariculture organisms.

The present invention is generally directed towards a method for removing hydrocarbon contamination from a substrate prior to a nitridation step, therein providing for a generally uniform nitridation of the substrate. The method comprises placing the substrate in a process chamber and flowing an oxygen-source gas into the process chamber. A first plasma is formed in the process chamber for a first predetermined amount of time, wherein the hydrocarbons combine with one or more species of the oxygen-source gas in radical form to form product gases. The gases are removed from the process chamber and a nitrogen-source gas is flowed into the process chamber. A second plasma is then formed in the process chamber for a second predetermined amount of time, therein nitriding the substrate in a significantly uniform manner.

The invention belongs to the field of environmental protection, and particularly relates to a screening method of coastal wetland polycyclic aromatic hydrocarbon pollution purification and remediationplants. The method is characterized by comprising the following steps: (1) performing field plant investigation: carrying out current distribution situation investigation on coastal wetland plants tobe remediated, and determining coastal wetland plants to be remediated through sample line and quadrat investigation; (2) screening local plants; (3) performing environmental simulation of differentpollution degrees of polycyclic aromatic hydrocarbon; (4) planting remediation plants; and (5) evaluating and screening the remediation plants. The screening method is comprehensive, systematic and efficient, and factors and contents influencing the evaluation and screening of the remediation plants are found.

The invention provides a method for repairing in-situ electrochemical circulation wells polluted by chlorinated hydrocarbons. The steps are as follows: dig wells in groundwater polluted areas, and install well pipes in the wells, wherein every two wells form a group, and in each group of wells, One well is used as a water injection well, and the other well is used as a water pumping well. The top end of the well pipe is open and the bottom end is closed. Several small holes are opened on the lower end of the well pipe; the anode plate is suspended into the water injection well and the cathode plate, the anode plate and the cathode plate are respectively connected to the positive pole and the negative pole of the power supply arranged outside the well through wires; the power supply is started to energize the anode plate and the cathode plate, and at the same time, the groundwater in the pumping well is continuously pumped by a water pump and injected into the water injection well In order to strengthen the groundwater flow circulation, the hydrogen and oxygen produced in the water injection wells diffuse to the aquifer under the action of the groundwater flow circulation to promote the chemical / microbial degradation of chlorinated hydrocarbons in the groundwater. The restoration method provided by the invention has stable effects and is environmentally friendly.