| Author | Nuttapol Tanadchangsaeng |
| Call Number | AIT Thesis no.EV-07-35 |
| Subject(s) | Nitrogen--Physiological effect--Mathematical models
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environmental Engineering and Management. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-07-35 |
| Abstract | A biofloc model was developed for Anammox process incorporating nitrite inhibitory conditions. For the model, mass transfer and substrate uptake were considered in a spherical biofloc with uniform properties (density, diffusivity, etc.). Nitrite inhibition was modeled using Haldane kinetics which the inhibition coefficient was determined by using the continuous stirred-tank reactor (CSTR) operation results operating with the synthetic wastewater composition. By plotting the graph, the inhibition coefficient (Ki) of nitrite was found to be 39.79 mg N02-N L-1. Half velocity constant (Ks) of ammonium and nitrite were found to be 16.6 mg NH4+-N L-1 and 2.4 mg N02-N L-1 respectively, and k constant of ammonium and nitrite were 0.149 and 0.114 d-1 respectively. Structural properties of Anammox floc inside the CSTR reactor was determined using FISH and Mastersizer S (light scattering)method. The volume mean-size diameter, the surface area of one biofloc was found to be 213.54 microns and 1.432*10-7 m2 and about 66 percent of biofloc was Anammox bacteria. Biofloc model was verified using the operational results from CSTR reactor. The biofloc counts were assumed to be proportional to the biomass concentration inside the reactor for the modeling purposes. The mathematical model developed for the biofloc relatively agreed with the CSTR reactor operation results until the influent nitrite concentration of 250 mg NO2-N L-1 which showed inhibitory results. The Anammox biofloc model developed in this study was based on spherical coordinate system which provided more accurate model and can be applied with the large-scale reactor which the results of the model will not change. |
| Year | 2007 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-07-35 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Annachhatre, Ajit P.; |
| Examination Committee(s) | Preeda Parkpian;Shipin, Oleg; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2007 |