| Author | Chen, Ann-cheng |
| Call Number | AIT Thesis no. EV-91-20 |
| Subject(s) | Sewage--Purification--Activated sludge process
|
| Note | A thesis submitted in partial fulfillment of the requirements for
the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This study was aimed to cultivate thermophilic organisms which can perform optimally at 55°c, and to utilize their increased reaction rate at increased temperature. A semi-pilot modified U.A.S.B. reactor were operated at different organic loading of 2 to 24 Kg COD/m3.day corresponding to H.R.T.:12o hr to 10 hr and using distillery wastewater as feed substrate which was inherently at high temperature. Investigations on gas production rate, biogas composition, COD balance, sulfur balance, microbial and physico-chemical mechanism of granular sludge formation were made. It was determined that organic loading up to 24 Kg COD/m3.day could be handled with satisfactory efficiency. High methane production rate was linearly increasing correspondingly with increasing organic loading. Higher organic loading was still imposed continuously, that is, maximum organic loading was not obtained yet. It was found that limiting step of thermophilic U.A.S.B. reactor was propionate degradation. The interspecies hydrogen transfer in the system was very important factor for process performance. Based on COD balance, 68% of removal COD was converted to methane gas. Also it was found that sulfate reducing bacteria can not compete with methanogenic bacteria in the system. Both Methanosarcina-like and Methanothrix-like methanogens were coexisting in granular sludge. |
| Year | 1991 |
| 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) | Harada, Hideki |
| Examination Committee(s) | Tran, Francis T. ;Verink, Johan
|
| Scholarship Donor(s) | Chinese Taipei Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |