US Government as Represented by the Secretary of the Army

University of Delaware

Pei Chiu

Byung Joon Kim

Seok-Young Oh

Daniel K Cha

Yan Jin

A process for removing microorganisms and/or precursors of disinfection by-products from a medium sought to be treated comprising treating the medium with one or more elements capable of forming an oxide, a hydroxide, and/or an oxyhydroxide through corrosion is disclosed. A system for effecting the removal or inactivation of microorganisms and/or disinfection by-product precursors is also contemplated.

Removal of microorganisms and disinfection byproduct precursors using elemental iron or aluminum

A waste stream from energetics processing is treated using a pre-filter having media, preferably sand, and a metal that has a reducing potential, preferably elemental iron (Fe). The pre-filter is connected to a zero-valent metal column reactor. The waste stream is pumped through the pre-filter to trap solids and deoxygenate it, then enters the reactor and is subjected to a reducing process. Fefrom the reactor is transformed to the ferrous ion (Fe), added to the resultant product, and fed to a continuously stirred tank reactor (CSTR) in which Fenton oxidation occurs. This product is then sent to a sedimentation tank and pH-neutralized using a strong base such as sodium hydroxide (NaOH). The aqueous portion is drawn off and the sludge pumped from the sedimentation tank. Both tanks are monitored and controlled to optimize required additives, while monitoring of pressure drop across the pre-filter and column reactor establishes replacement requirements.

System for destroying hazardous waste resultant from the production of energetics such as explosives

A waste stream is treated in a pre-filter having media, preferably sand, connected below a zero-valent metal column reactor incorporating a metal with reducing potential, preferably elemental iron (Fe); the combination preferably configured as a single unit. The waste stream is pumped through the pre-filter to trap solids and deoxygenate it, then enters the reactor and is subjected to a reducing process. Most of the Feis transformed to the ferrous ion (Fe), mixed with the reduced product, and fed to a continuous stirred tank reactor (CSTR) in which Fenton oxidation occurs. The output is then sent to a sedimentation tank and pH-neutralized using a strong base such as sodium hydroxide (NaOH). The aqueous portion is drawn off and the sludge pumped from the sedimentation tank. The system is monitored and controlled to optimize required additives, while monitoring of pressure drop across the pre-filter and column reactor establishes replacement requirements.

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Hockessin, DE, United States of America

Pei Chiu