| Author | Ahmed, Mesbah Uddin |
| Call Number | AIT Thesis no. EV-95-22 |
| Subject(s) | Sewage--Purification--Biological treatment
|
| 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-95-22 |
| Abstract | This experimental study was unde11aken on mainly two type of anaerobic pilot scale reactors installed in the premises of Central Wastewater Treatment Plant of Lat krabang Industrial Estate. Anaerobic holding tank with and without recycle and anaerobic contact tank reactor were used in the study. Anaerobic contact tank reactor was started by inoculating with sludge available at Cenral Wastewater treatment plant site. On the other hand, no seeding was used for the anaerobic holding tank as it has been operating since September 1994, for treating the same wastewater and found to contain a sludge blanket. Anaerobic holding tank was operated at different HRT in order to find the maximum VFA production. It was found to be 10 hr HRT where VFA production is maximized. The condition for maximum VF A production is not the optimum one in view of the high flow rate(8000 m3/d) of the incoming wastewater to the Central Wastewater Treatment Plant. However, this reactor was operated for 2 and 4 hr HRT latter with a mixing pump installed and found to be effective at HRT 4 hr both in terms of VF A production and actual economic plant design consideration. Settled aerobic sludge from activated sludge process was recycled to the holding tank and HRT was kept at 4 hr and recycle ratio was varied as 20%, 30% and 40%. At this stage process looked like A/O process for biological phosphorus removal. Total phosphorus concentration as low as 2mg/I was achieved in the effiuent of activated sludge process (ASP) along with a reasonably good NH3-N and COD removal efficiency. More VF A was produced in anaerobic contact tank than in anaerobic holding tank (with and without recycle) along with 20-40% COD removal efficiency. However, anaerobic contact tank failed at HRT 5 hr. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-95-22 |
| 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) | Stoll, Ing. Uwe;Yang, Byung- Soo |
| Scholarship Donor(s) | DAAD, The Federal Republic of Germany |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1995 |