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Method for in-suit repairing soil contaminated by halogenated hydrocarbons, groundwater and mixture of soil and underwater and its used combination or carrier catalyst

An in-situ repair and catalyst technology, applied in the restoration of contaminated soil, contaminated groundwater/leachate treatment, metal/metal oxide/metal hydroxide catalyst, etc., can solve harsh transition conditions, uncertain performance, Concentration of pollutants continues to decline and other issues, to maintain the effect of activity and low cost

Inactive Publication Date: 2007-03-14
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

[0050] Another advantage of the bioremediation composition is that the pollutants are fully degraded into non-toxic products such as carbon dioxide, water and methane. In addition, the bioremediation product is non-toxic. Thus, no toxic by-products are produced, and groundwater impacts as a result of placing the composition are incidental and generally do not exceed drinking water or groundwater standards at any time during treatment. Soil and groundwater contamination can be treated simultaneously, and the composition is easily installed using equipment common in the industry. Embodiment 1: Preparation of supported catalyst by low temperature decomposition of metal nitrate

[0051] 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 mixtu...

Embodiment 2

[0054] The final properties of the catalyst are influenced by the final reduction temperature. For example, when the catalyst is reduced at temperatures below 700°C and then exposed to air after cooling, an exothermic reaction may occur, oxidizing the partially reduced iron. However, when the final reduction is carried out at elevated temperature, eg about 700-800°C, the catalyst is stable and has no effect from exposure to air. If reduction is accomplished at temperatures below 450°C, the material may be pyrophoric. Various catalyst activities can be obtained at reduction temperatures of about 450-700°C. Example 2: Preparation of a supported catalyst comprising activated carbon impregnated with elemental iron by a precipitation process

[0055] 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 appli...

Embodiment 3

[0058] Embodiment 3: the application of composition of the present invention

[0059] 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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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/00B01J21/18B01J20/02B01J20/06B01J20/20B01J20/32B01J23/745B01J35/10B01J37/08B01J37/16B09C1/00B09C1/08C02F1/28C02F1/70C02F3/34
CPCC02F3/104B01J21/18B01J20/06B09C1/08B01J37/082B01J35/1023B01J20/3204C02F1/283B01J20/3234B01J20/3236C02F1/705B09C2101/00B01J20/02C02F2101/36B01J35/1019C02F2101/32C02F2101/101C02F1/281B01J20/20B01J20/32C02F2103/06B01J20/28057B01J20/3078C02F2305/06C02F3/2806B01J20/0229B01J35/1028B01J23/745B01J20/3085C02F1/288C02F3/34B09C1/002B01J37/088B01J37/16B01J20/0281Y02W10/10B01J35/618B01J35/615B01J35/617
Inventor 斯科特·诺兰鲍勃·埃利奥特
Owner REMEDIATION PROD INC
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