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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

Inactive Publication Date: 2005-09-14
REMEDIATION PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) It will take a long time to achieve the continuous reduction of pollutant concentration
(2) While reductions can be achieved, they rarely meet specified purification standards or targets for soil and groundwater
(3) The performance is variable and largely depends on site conditions and pollution levels
(5) As far as passive systems dealing with chlorinated solvents are concerned, by-products that are more toxic than the original pollutants are often released, resulting in a worse transition than before treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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 ...

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PUM

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Abstract

The invention provides a bioremediation composition for in situ bioremediation of soil and / or groundwater contaminated with hydrocarbons, comprising an adsorbent capable of adsorbing said hydrocarbons, a mixture of facultative anaerobes capable of metabolizing said hydrocarbon under sulfate-reduction conditions, a sulfate-containing compound that releases sulfate over a period of time, and a nutrient system for promoting growth of said anaerobes, wherein said nutrient system includes a sulfide scavenging agent.

Description

technical field [0001] The present invention relates to compositions and methods for in situ remediation of contaminated environments, in particular to remediation of soil and / or groundwater contaminated with halohydrocarbons, and to bioremediation of soil and / or groundwater contaminated with hydrocarbons. Background technique [0002] With the increasing concern for environmental protection and public health and safety, the identification and removal of pollutants in the environment, especially in groundwater, has become one of the most important environmental issues today. The uncontrolled dumping of hazardous materials over the years has caused serious contamination of groundwater in many areas, causing major health problems and causing extensive damage to regional ecosystems. Therefore, in recent years, great emphasis has been placed on the purification and restoration of polluted groundwater and the surrounding environment of garbage dumps, which has led to the emergenc...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/06B01J20/20B01J20/32B01J21/18B01J23/745B01J35/10B01J37/08B01J37/16B09C1/00B09C1/08C02F1/28C02F1/70C02F3/34
CPCC02F3/104B01J21/18B01J20/06B09C1/08B01J37/082B01J35/1023B01J20/3204C02F1/283B01J20/3236C02F1/705B09C2101/00B01J20/02C02F2101/36B01J35/1019C02F2101/32C02F2101/101C02F1/281B01J20/20C02F2103/06B01J20/28057B01J20/3078C02F2305/06C02F3/2806B01J20/0229B01J35/1028B01J23/745B01J20/3085C02F1/288C02F3/34B09C1/002B01J37/088B01J37/16B01J20/0281Y02W10/10B01J35/618B01J35/615B01J35/617
Inventor 斯科特·诺兰鲍勃·埃利奥特
Owner REMEDIATION PROD INC
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