Determination of the fate and behavior of an alternative surfactant in a water recycle system (WRS)

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Title: Determination of the fate and behavior of an alternative surfactant in a water recycle system (WRS)
Author: Rector, Tony James
Abstract: The fate of a common commercial surfactant was investigated in biological reactors intended for long -term space applications . A NO2" reducing packed -bed bioreactor was employed to evaluate degradation of surfactant present in a typical space station greywater stream . The research was conducted to determine if a commercial surfactant could be used in the place of the current cleansing formulation and be degraded in biological water recycle system proposed for space travel . The commercial cleansing formulation used in the research was Pert Plus® for Kids (PPK ) , which contains sodium laureth sulfate (SLES ) as the active surfactant . Experiments included a combination of microcosm experiments as well as a continuous -flow packed -bed bioreactor . The hydraulic retention time of the packed -bed bioreactor was varied through changes in flow rate to yield different steady -state values for NO2' reduction TOC , COD and SLES removal . Steady -state conditions allowed for the determination of degradation potential of both PPK and SLES . It was found that both constituents degraded well under NO2" reducing conditions . Stoichiometric relationships were used to determine if measured parameters could accurately predict the observed SLES degradation . Frora these relationships , it was found that other less common degradation pathways (biotic and /or abiotic ) could have transformed SLES . Also , bacterial kinetics were determined for the currently used surfactant , Igepon T42 ™ , and the commercial surfactant , SLES . From the rates determined it was found that Igepon T42™ exhibits faster degradation rates compared to the SLES . It was also found that the rates determined for SLES were concentration dependent . During this evaluation both PPK and SLES were effectively degraded under NO2" reducing conditions indicating their possible use in a WRS .
URI: http : / /hdl .handle .net /2346 /11410
Date: 2002-12

Citation

Rector, Tony James Determination of the fate and behavior of an alternative surfactant in a water recycle system (WRS). Master's thesis, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /11410 .

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