| Author | Wang, Xiaodong |
| Call Number | AIT Thesis no. EV-95-39 |
| Subject(s) | Sewage--Purification
|
| Note | A thesis submitted in partial fulfilment of the requirement for the degree of Master of Science. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-95-39 |
| Abstract | Two lab scale UASB reactors, the conventional UASB reactor and the modified UASB reactor which had a biogas stripping and biogas scrubbing unit were used to study the treatability of high sulfate content wastewater. The synthetic wastewater which contained 15g COD/L was used as the substrate. Three runs each with a hydraulic retention time of 72hrs, 48hrs and 24hrs and each run was tested two upflow velocities, I.Om/hr andl.5m/hr respectively. With a total operating period of 150 days, the two UASB reactors had no significant different in treating the wastewater by comparing the analyzed parameters including COD, gas production, VFA, Sulfate etc at the upflow velocity of I.Om per hour. By increasing the upflow velocity from I .Om per hour to 1.5m per hour and increasing gas flow rate from 30ml/min to 65ml/min thus to increase gas-liquid contacting chance, the COD removal and gas production efficiency was improved by 55.2% and 43.2% respectively in the modified UASB reactor compared with the conventional UASB reactor which became stable after 60 days operation and without significant change with the change of upflow velocity. The efficiency of hydrogen sulfide scrubbing unit was about 80%. Total volatile fatty acid of the modified UASB reactor reduced to 665mg/L compared with 1775mg/L of the conventional UASB reactor at the end operation. Microscope observation showed that different microorganisms consortium developed in the two reactors. The analyzed parameters _indicated that with the removal of sulfide the inhibition caused by sulfide could be reduced. The experimental result showed that the optimum operating condition was under the condition of 72hrs' HRT and upflow velocity of l .5m/hr at which COD removal efficiency was 77%, gas production was 3200ml per day. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-95-39 |
| 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) | Samorn Muttamara;Umita, Teruyuki |
| Scholarship Donor(s) | ADB Japan Scholarship Program |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 1995 |