| Author | Langam, Agnes Fe P. |
| Call Number | AIT Thesis no. EV-95-1 |
| Subject(s) | Sewage--Purification--Activated sludge process
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ;--no. EV-95-1 |
| Abstract | The phenomenon of granulation of anaerobic biomass subjected to organic loading
fluctuation was investigated using four (4) laboratory-scale Upflow Anaerobic Sludge Blanket (UASB) reactors using synthetic wastewater as substrate. The objective was to evaluate the effects of this fluctuation in the granule formation based on the specific activity and size distribution test of the sludge. Fluctuation was carried out in the three reactors operated in batch mode under different HRT. One reactor was steadily operated in continuous flow which served as the control. Eliminating factors which might inhibit or enhance granulation, it was noticed that fluctuation of organic loading clearly affected the granule formation. Its contribution was related to the hydrogen concentration as well as the degree of starvation that the sludge were exposed to. High organic loading at which high hydrogen gas and volatile fatty acids might be produced inhibits the H;i sensitive methanogenic bacteria, namely, the propionate- and butyrate-degrading bacteria. Low H;i concentration favors the growth of this bacteria which also implies low substrate supply . This dropping and rising of H;i concentration due to fluctuation seemed to affect the association of the different bacterial species possibly leading to granule formation. The batch mode upflow treatment system appeared to provide favorable condition, thus, hasten up granulation compared to the conventional continuous upflow treatment system. However, the degree of fluctuation in batch mode may pose crucial condition to the biomass population if exhaustion of substrate is approached, thus, starvation is reached which may lead to granular disintegration. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-95-1 |
| 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) | Yang, Byung-Soo |
| Examination Committee(s) | Annachhatre, Ajit P.;Visvanathan, C. |
| Scholarship Donor(s) | Government of Japan |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1995 |