Using Supercritical Water Oxidation to Treat Hydrolysate from VX Neutralization (1998) / Chapter Skim
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5 Full-Scale Process Design
5 Full-Scale Process Design
Pages 41-51
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From page 41... ...
· disposal of all waste streams More detailed process flow diagrams for the SCWO and evaporation process steps are provided in Appendix A Supporting process steps are the process water system, which provides water for ton container cleanout and other operations; sodium hydroxide storage, where caustic materials are stored and prepared for the neutralization step and other necessary pH adjustments; the Vent to cascading Vent to carbon .
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From page 42... ...
Complete redundant process systems are provided for the ton container cleanout, neutralization, and SCWO process steps so that maintenance can be performed on a redundant system while the parallel system continues to operate. Redundant critical components (e.g., pumps and control valves)
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From page 43... ...
Once the oxidation reaction has been initiated, the heat from oxidation of the auxiliary fuel reaction will further increase the reactor temperature to the desired process conditions. Hydrolysate 43 should not be fed to the reactor until the temperature reaches the design temperature range of 635 to 650°C or if the pressure is lower than the design pressure for the reactor.
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From page 44... ...
the heat of reaction during the neutralization process step and (2) the heat release from the oxidation of supplemental fuel added during both processes TABLE 5-1 Composition of the Post-Treatment SCWO Aqueous Effluent and the Solid Salt Streams Constituent Value Units Evaporator Condensate TDS Na+ so4-2 po4-3 NO3 NO2C1 TOC MPA EMPA THIOL pH Specific MetalsC Arsenic Barium Calcium Chromium Copper Iron Lead Magnesium Mercury Selenium Evaporator Solids Na2SO4 Na2HPO4 H2O (fixed as water of hydration)
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From page 45... ...
Thus, the near real-time agent monitors deployed on the common stack of the baseline incinerators as process "end point" monitors are not applicable to the SCWO process, although they will be needed for vents associated with the upstream toxics containment area (e.g., ton container cleanout and agent neutralization operations)
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From page 46... ...
MANAGING UPSETS AND MAINTENANCE Components of the postneutralization process step that will be subject to standard process application conditions include high pressure pumps, heat exchangers, control valves, etc. The process design includes enough redundancy to minimize component changeouts and permit maintenance without affecting the overall process schedule.
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From page 47... ...
The building that will house the SCWO unit will be fabricated to the same standards as other structures associated with the NECDF (Newport Chemical Agent Disposal Facility)
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From page 48... ...
Caustic will be supplied from the caustic storage tank via a transfer pump. Diesel fuel will be used as an auxiliary fuel for the SCWO process during start-up and shutdown and when supplemental fuel is required to process dilute solutions (e.g., decontamination fluids)
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From page 49... ...
. The schedule includes timelines for the acquisition design package, environmental permit applications, system contract request for proposal and award, final facility design, equipment procurement, site preparation, construction, equipment installation, systemization, pilot testing, operations, and closure.
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From page 50... ...
. 1me, me Acquisition of design package Environmental permitting System contact request for proposal and award Final facility design Equipment procurement, site preparation, construction, and equipment installation Systemization Pilot testing Operations Closure 919103~123104 4123104-1213 1/04 12/3 1/04-7/10/06 Source: Adapted from Stone arid Webster, 1997a.
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From page 51... ...
To date, the neutralization and SCWO process for treating VX seems to have the necessary public support, or at least the committee heard no evidence from the contractors that there was public opposition. Review of news clippings from the Newport, Indiana, area by committee members also supports the opinion of the contractors that the public is not opposed to the proposed technology at this time.
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