Compositions for removing hydrocarbons and halogenated hydrocarbons from contaminated environments
A halogenated hydrocarbon and composition technology, which is applied in the field of bioremediation of hydrocarbon-contaminated soil and/or groundwater, can solve problems such as severe transition conditions, uncertain performance, and continuous decline in pollutant concentration, and achieves low-cost, active-keeping Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0051] Embodiment 1: Preparation of supported catalyst by low temperature decomposition of metal nitrate
[0052] A quantity of activated carbon and a quantity of hydrated ferric nitrate calculated to provide the desired weight percent of elemental iron in the final product were mixed. Iron salts are generally moist and readily melt when heated, thus producing a homogeneous mixture. With stirring, the mixture was heated to about 50°C to melt the salt. A small amount of water may be added to give the mixture a creamy consistency, if desired. The mixture is then dried at a temperature of 90-110° C. so that the mixture can be crushed into a free-flowing granular powder. Some nitrate breakdown occurs during this process.
[0053] The dried powder is then loaded into a furnace and heated according to a temperature program while maintaining reducing conditions at all times. Firstly, the temperature is slowly raised to 150-200°C to thoroughly dry the catalyst and continue to degr...
Embodiment 2
[0056] Example 2: Preparation of a supported catalyst comprising activated carbon impregnated with elemental iron by a precipitation process
[0057] An appropriate amount of ferric sulfate hydrate is dissolved in deionized water in a tank under stirring, and a certain amount of activated carbon is added. Stirring was continued after the addition was complete and vacuum was applied to the jar to degas the charcoal. Once the char is degassed, sufficient dilute sodium bicarbonate solution is added slowly to initiate precipitation of goethite and other iron oxides on the suspended char. Pressurizing the tank during the bicarbonate addition can facilitate the maceration process. After adding the bicarbonate, continue mixing for a few more hours. The process ends when the test aliquot is negative for ferrous ions. The slurry was then washed with deionized water and filtered several times. Finally, the collected catalyst was dried at 110°C. At this point, the char is impregnate...
Embodiment 3
[0060] Embodiment 3: the application of composition of the present invention
[0061] A small diameter (eg, approximately 0.75-2 inches in diameter) injection rod is inserted to a target depth (eg, 5-150 feet). The depth depends on the power of the drill and the hardness of the soil. A hydraulically driven direct push drill is used to strike / push the injection rod to the desired depth, then withdraw approximately 6 inches to open a small gap below the injection point. A premixed aqueous suspension of the supported catalyst or bioremediation composition of the present invention is injected along the rod under pressure. The pressure in the formation increases and the slurry begins to flow into the formation. No attempt was made to control the fluid flow path, but the goal was to achieve a substantially uniform distribution of the suspension within the formation. The suspension tends to overflow in all directions from the point of injection, the average or effective radius of ...
PUM
Login to view more Abstract
Description
Claims
Application Information
Login to view more - R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap