Kinetics of Anionic Surfactant Anoxic Degradation
| dc.contributor | Autenrieth, Robin | |
| dc.creator | Camacho, Julianna G. | |
| dc.date.accessioned | 2010-07-15T00:16:23Z | |
| dc.date.accessioned | 2010-07-23T21:47:02Z | |
| dc.date.accessioned | 2017-04-07T19:57:21Z | |
| dc.date.available | 2010-07-15T00:16:23Z | |
| dc.date.available | 2010-07-23T21:47:02Z | |
| dc.date.available | 2017-04-07T19:57:21Z | |
| dc.date.created | 2010-05 | |
| dc.date.issued | 2010-07-14 | |
| dc.description.abstract | The biodegradation kinetics of Geropon TC-42 (trademark) by an acclimated culture was investigated in anoxic batch reactors to determine biokinetic coefficients to be implemented in two biofilm mathematical models. Geropon TC-42 (trademark) is the surfactant commonly used in space habitation. The two biofilm models differ in that one assumes a constant biofilm density and the other allows biofilm density changes based on space occupancy theory. Extant kinetic analysis of a mixed microbial culture using Geropon TC-42 (trademark) as sole carbon source was used to determine cell yield, specific growth rate, and the half-saturation constant for S0/X0 ratios of 4, 12.5, and 34.5. To estimate cell yield, linear regression analysis was performed on data obtained from three sets of simultaneous batch experiments for three S0/X0 ratios. The regressions showed non-zero intercepts, suggesting that cell multiplication is not possible at low substrate concentrations. Non-linear least-squares analysis of the integrated equation was used to estimate the specific growth rate and the half-saturation constant. Net specific growth rate dependence on substrate concentration indicates a self-inhibitory effect of Geropon TC-42 (trademark). The flow rate and the ratio of the concentrations of surfactant to nitrate were the factors that most affected the simulations. Higher flow rates resulted in a shorter hydraulic retention time, shorter startup periods, and faster approach to a steady-state biofilm. At steady-state, higher flow resulted in lower surfactant removal. Higher influent surfactant/nitrate concentration ratios caused a longer startup period, supported more surfactant utilization, and biofilm growth. Both models correlate to the empirical data. A model assuming constant biofilm density is computationally simpler and easier to implement. Therefore, a suitable anoxic packed bed reactor for the removal of the surfactant Geropon TC-42 (trademark) can be designed by using the estimated kinetic values and a model assuming constant biofilm density. | |
| dc.identifier.uri | http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7665 | |
| dc.language.iso | eng | |
| dc.subject | Monod kinetics | |
| dc.subject | Kinetic parameters | |
| dc.subject | Parameter estimation | |
| dc.subject | Surfactant | |
| dc.subject | Geropon TC-42? | |
| dc.subject | Biofilm model | |
| dc.title | Kinetics of Anionic Surfactant Anoxic Degradation | |
| dc.type | Book | |
| dc.type | Thesis |