| Author | Visut Iam-a-ram |
| Call Number | AIT Thesis no.EV-85-19 |
| Subject(s) | Nitrification
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The effect of sodium ion on the activity of Nitrosomonas to oxidize ammonium substrate to nitrite was investigated using batch experiments. In order to develop the nitrification model (Monotype) for ammonium oxidation process in presence of sodium ion as an inhibitor, kinetic parameters such as maximum specific growth rate (Um), ratio of initial bacteria concentration to yield constant (Xo/Y), saturation constant (Ks) and decay rate (Kd) were computed from experiment data. A Um value of 3.13 x 10-2h-1 was obtained using nonlinear regression analysis to fit the substrate depletion data from batch experiments. Saturation constant (Ks) values of 13.46 and 11.65 mg N/l were obtained from Lineweaver-Burke and Eadie-Hofstee plots, respectively. The type of inhibitor was found to be noncompetitive with an inhibition constant(Kl) value of 6.64 g Na/l. A Kd value of 3.08x10-3h-1 was also abstained from batch experiments measuring a decrease in microbial activity in absence of a substrate. The ammonium-oxidizing bacterial growth model with an inhibitory effect of sodium ion was developed. Ammonium oxidizing bacteria shored a reactivating behaviour after being transferred from a salted medium to a fresh one though those presence of 5.260 to 10.520 g Na/l (corresponding to 50 to 100% Na based on sea water content) appeared to lose this property. |
| Year | 1985 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Ohgaki, Shinichiro |
| Examination Committee(s) | Lohani, B.N. ;Samorn Muttamara |
| Scholarship Donor(s) | The Government of the Netherlands |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1985 |