Process for treating waste from the production of energetics

Details Process for treating waste from the production of energetics Process for treating waste from the production of energetics

2005-09-08

2008-11-04

Langel, Wayne (Department: 1793)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C210S719000, C210S721000, C210S724000, C210S726000, C210S759000, C210S909000, C588S403000, C588S405000, C588S408000, C588S409000

Reexamination Certificate

active

07445717

ABSTRACT:
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 (Fe0); 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 Fe0is transformed to the ferrous ion (Fe+2), 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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Oh, Seok-Young; et al., Effect of Adsorption to Elemental Iron on the Transformation of 2,4,6-Trinitrotoluene and Hexhydro-1,3,5-Trinitro-1,3,5- Triazine in Solution, Environ Tech. and Chem., vol. 21, No. 7, pp. 1384-1389, (2002).
Oh, Seok-Young, et al., Enhancing Fenton Oxidation of TNT and RDX through Pretreatment with Zero-Valent Iron; Water Research 37, 4275-83 (2003).
Oh, Seok-Young, et al., Enhancing Oxidation of TNT and RDX in Wastewater: Pre-Treatment with Elemental Iron; Water Science and Tech., vol. 47, No. 10, 93-99 (2003).
Oh, Seok-Young, et al., Reduction of Nitroglycerin with Elemental Iron: Pathway, Kinetics, and Mechanisms; Environ. Sci. Technol., 38, 3723-30 (2004).
Oh, Seok-Young, et al., Conceptual Comparison of Pink Water Treatment Technologies: Granular Activated Carbon, Anaerobic Fluidized Bed, and Zero-Valent Iron-Fenton Process; Water Sciences & Technology, vol. 49, No. 5-6, 129-36 (2004).
Oh, Seok-Young, et al.,Reductive Transformation of Hexahhydro-1,3,5-Trinitro-1,3,5-Triaxine, Octahydro-1,3,5,7-Tetranitro-1,3,5,7-Tetrazocine, and Methyleedninitramine with Elemental Iron; Environ. Tox. & Chem., vol. 24, No. 11, 2812-19 (2005).
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Kim, Byung J., Affidavit, Jun. 5, 2008, In Re: U.S. Appl. No. 11/229,441.

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