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US 2018/0009678 A1Published application
Method for recycling oilfield and other wastewater
AssigneeTerra-Hydrochem, Inc.
InventorRoger Kubala
Life of this patent
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Abstract
The present invention pertains to a process for treating waste water from mining. The process involves contacting the mining waste water with an emulsion of a nano scale compound comprising iron, magnesium, or both. Mixing results in a substantially foam-like layer at the surface of the mixture which may be further oxidized to form treated water.
Claims20
A process for treating mining waste water wherein the process comprises:
- contacting the mining waste water with an aqueous emulsion comprising one or more oil-liquid membranes surrounding a nano scale compound comprising iron, magnesium or both wherein the weight ratio of emulsion to mining waste water is from about 1:150 to about 1:3000;
- and
- mixing the mining waste water and emulsion for a time and under conditions sufficient to lower the surface tension of said waste water to from about 35 to about 75 dynes per cm at 25° C. according to the definition of kilogram-force for all gravitational units and form a substantially foam-like layer at the surface of the mixture;
- and
- oxidizing the mixture such that the mixture comprises treated water.
2 more elements
A process for treating mining waste water wherein the process comprises:
- providing mining waste water to a conduit connected to a vessel in a manner such that the mining waste water moves through the conduit to the vessel;
- injecting an aqueous emulsion into the conduit at one or more injection points wherein the aqueous emulsion comprises one or more oil-liquid membranes surrounding a nano scale compound comprising iron, magnesium, or both, wherein the weight ratio of emulsion to pre-treated waste water is from about 1:150 to about 1:3000, wherein the residence time in the conduit is at least about 1 minute up to about 30 minutes, and wherein the conditions are sufficient to lower the surface tension of said waste water to from about 35 to about 75 dynes per cm at 25° C. according to the definition of kilogram-force for all gravitational units prior to said mining waste water entering said vessel;
- and
- contacting hydrogen peroxide with the mining waste water in the vessel in sufficient amounts and under conditions to reduce free cyanide content to below about 2 mg/L according to EPA 9016 test.
1 more element
Dependencies are inferred from the claim text.