Photocatalytic Post-Treatment in waste Water Reclamation Systems

Cooper, Gerald; Ratcliff, Matthew A.; Verostko, Charles E.

doi:10.4271/891508

Cited by 8 publications

(1 citation statement)

References 11 publications

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“…The technologies which will be used to SHUTTLE ORBITER HUMIDITY CONDENSATES 819 achieve this goal include vapor compression distillation [4], multifiltration [5,6], low temperature aqueous phase catalytic oxidation [7,8], and disinfection using the microbial check valve [9,10]. A variety of oxidative techniques have been applied to the mineralization of aqueous phase organic contaminants in simulated spacecraft reclaimed waters including low temperature aqueous phase catalytic oxidation [7,8], wet oxidation [11], supercritical water oxidation [12,13], photocatalytic oxidation [14], and electrooxidation [15,16].…”

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confidence: 99%

Thermodynamics of the oxidation of dissolved organic contaminants in shuttle orbiter humidity condensates

Atwater

1995

Journal of Environmental Science and Health . Part A: Environme

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A condensing heat exchanger has been used to collect humidity condensates during two space shuttle missions. Analyses of the reclaimed waters indicate the presence of short chain ' alcohols, carboxylic acids and other hydrophilic low molecular weight organics which originate as airborne contaminants consequent to human metabolism and materials outgassing. To better understand aqueous phase oxidation processes proposed for the mineralization of these dissolved organics, the thermodynamics of combustion of the predominant species to CO 2 (aq) and H 2 O( ) have been examined. The relationships between temperature, ΔH, ΔS, and ΔG for the mineralization reactions have been derived for nine of the most significant contaminants and fitted to a fourth degree polynomial with excellent results. These data were then used to calculate values of the three aforementioned thermodynamic properties as functions of reaction temperature for the complete oxidation of the two humidity condensates. The results indicate that the enthalpy of combustion will result in only minor heating of the aqueous phase.

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