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Method for decontamination of waste by selective adsorption of PFOS

IP.com Disclosure Number: IPCOM000042190D
Publication Date: 2005-Feb-03
Document File: 3 page(s) / 110K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for decontamination of waste by selective adsorption of PFOS. Benefits include improved efficiency in removing nonpolar organic contaminants.

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Method for decontamination of waste by selective adsorption of PFOS

Disclosed is a method for decontamination of waste by selective adsorption of PFOS. Benefits include improved efficiency in removing nonpolar organic contaminants.

General description

              The disclosed method is a material, device, and process for the removal of perfluorooctylsulfonate (PFOS) derivatives and their analogues from wastewater and polar waste streams.

              The key elements of the method include:

•             A porous media with highly nonpolar surfaces and high surface area

•             A container for the porous media suitable for attachment to a waste discharge source

•             The use of the porous media in a process for the reduction of the aqueous concentration of PFOS derivatives and their analogues

•             Extension of this technology to a wide array of other aqueous contaminants

              The disclosed method addresses the problem of PFOS contaminants in aqueous waste, an emerging problem in the electronics industry. The US Environmental Protection Agency (EPA) has proposed regulations that restrict PFOS and have the potential to limit the application of the conventional generation of lithographic (and other) materials as well as many leading next-generation materials candidates.

              The conventional solution to this problem is to incinerate PFOS wastes. Decontamination has not been conventionally addressed in any significant way. However, a precipitation technology based on metal salts (for example, ferric chloride) has been proposed as a potential for some limited forms and concentrations of PFOS.

Advantages

              The disclosed method presents several technical advantages. The disclosed method enables the selective removal of nonpolar organic contaminants (such as PFOS) from waste streams without the incineration of large volumes of low concentration waste. This methodology is anticipated to realize significant efficiency and cost savings.

Detailed description

              Aqueous emulsions and solutions of nonpolar contaminants can be made to separate through adsorption. Examples include the formation of oil slicks and the formation of butter from churned cream. To facilitate the separation, ca...