| Author | Phan Thanh Tri |
| Call Number | AIT Thesis no.EV-02-21 |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering.School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-02-21 |
| Abstract | Preliminary study of biodegradation of the oily wastewater was evaluated by activated sludge (AS) process and biological activated carbon (BAC) process operated in sequencing batch reactor (SBR) mode. In BAC process, powdered activated carbon (PAC) was added into the reactors at different doses of 100 - 500 mg/L. The feed wastewater had COD of 550 mg/L and Oil & Grease (O&G) concentration of 150 mg/L. The reactors were experimented at hydraulic retention time (HRT) of 3, 6, 10, 13 and 16 h. The results showed that the removal efficiency of AS process reached 80% for COD and 90% for O&G at HRT=13h. There was a tendency of effluent quality improvement of the BAC process at PAC dose = 500 mg/Land HRT = 3h in comparison with the AS process. Lab scale submerged membrane bioreactor (MBR) system with microfiltration membrane module was used to investigate the treatment of oily wastewater. The MBR system provided excellent effluent quality with COD in range of 11.2 to 85.9 mg/L and O&G in range of 0.2 - 7.3 mg/L when influent COD varied from 495 - 1835 mg/Land O&G varied from 150 - 600 mg/L. The removal efficiency was 89.9 - 99.9 mg/L for COD and 97.6 - 99.9 mg/L for O&G. The MBR system provided stable effluent quality against shock loading. The system could stand for the COD loading of 10.5 g COD/L.day and oil loading of 3.5 g oil/L.day without deteriorating the effluent quality. Combination of MBR process and BAC process to treat oily wastewater was investigated by adding PAC to the reactor at the dose of 2 g/L. The hybrid system showed little improvement in effluent quality. Membrane clogging of the hybrid system occurred more quickly in comparison with the same system without PAC addition about 5 days. The reason would be due to the plugging of PAC particles in the pores of the membrane. The membrane fouling in the MBR system was found reversible while that of the hybrid system with PAC addition was partially irreversible. The resistance of the cake layer was found the highest component contributing to the total resistance of the clogged membrane. It is suggested that during operation there was a critical point when the blockage of the membrane pores reached a level that made the air backwash ineffective, the formation of the cake layer became intensive leading to the membrane clogging. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-02-21 |
| 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) | Visvanathan, C. |
| Examination Committee(s) | Trankler, Josef ;Preeda Parkpian |
| Scholarship Donor(s) | Asian Development Bank |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2002 |