Modeling of nitrite inhibition in the anammox process | |
| Author | Suthakar, Tharmalingam |
| Call Number | AIT Thesis no.EV-06-36 |
| Subject(s) | Sewage--Purification--Nitrogen removal Sewage--Purification--Sequencing batch reactor process |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment Resource and development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-06-36 |
| Abstract | A general biofloc model was developed for Anammox process incorporating nitrite inhibition. 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. Activity tests for different initial substrate concentration were carried oat to determine the inhibition coefficient. By graph fitting technique using Kgraph software the inhibition coefficient for ammonia by nitrite was found to be 58.9 mg/l. Half velocity constant(K;) for the ammonium was found to be 26.5 mg/1 from the activity test results. A batch Anammox test run was carried out to determine the maximum specific growth and it was found as 0.0157d''. Structural properties of Anammox floc inside the Gas lift reactor was determined using microscopy and image analysis technique. The spherical equivalent mean diameter was found to be 56 microns. Biofloc model was verified using the operational results from gas lift reactor. Gas lift reactor was assumed to be Continuous Stirred Tank Reactor (CSTR) and the biofloc counts were assumed to be proportional to the biomass concentration inside the reactor for the modeling purposes. The model developed for the biofloc agreed with the gas lift reactor operational results until the total nitrogen loading of 0.93 Kg N/m3.d to the reactor and then showed inhibitory results when the nitrite influent concentration was above 285 mg/l. Actual inhibition occurred to the gas lift reactor when the total nitrogen was 2.42 Kg N/m3.d while the influent nitrite concentration was 450 mg/l. The biofloc model developed in this study was based on simplified Cartesian coordinates system and can be used for evaluating nitrite inhibition in Anammox biofilm reactor with appropriate modifications. |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-06-36 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Annachhatre, Ajit P. |
| Examination Committee(s) | Shipin, Oleg;Aramaki, Toshiya |
| Scholarship Donor(s) | Her Majesty the Queen of Thailand |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |