| Author | Sundarakumar, R. |
| Call Number | AIT Thesis no. EV-96-31 |
| Subject(s) | Water--Purification--Filtration
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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-96-31 |
| Abstract | Pilot scale experiments were carried out in contact flocculation filtration using floating media filter. In this study, four types of filter media combinations were tested. First combined fine sand and polypropylene media downflow filter was investigated. Then experiments were carried out with conventional rapid sand filter. After that, the combined coarse sand and polypropylene media filter was studied. Finally, synthetic floating dual media comprises polypropylene and polystyrene was investigated. While influent turbidity and filter depth were kept constant, the filtration velocity was varied from 5 to 12.5 m/h in order to find the optimum filtration velocity. The experiments were continued for different turbidity with optimum filtration velocity. At high influent turbidity, the contact flocculation filter did not perform well, in which all suspended solids retained within the filter bed itself. Headless development along with the filter bed and effluent water quality were monitored at frequent interval. Backwashing performance was also studied for all types of filters. Headless development was very high in conventional rapid sand filter and termination of the all runs were due to headless breakthrough whereas the headless development was very low in floating media filter and combined coarse sand and fine sand media filter. Even though combined fine sand and polypropylene media filter showed a higher filter run, the headless development and backwash water requirement were higher than the floating media filter. Major advantages of the floating media filter is the easy and economy in back washing. Floating media filter saved the backwash water more than 30% than all other filters. Another major advantage of the floating media filter is no intermixing even during and after backwashing, thereby eliminating the most common problem encountered in conventional dual media filter. |
| Year | 1996 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-96-31 |
| 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) | Kamei, T.;Sampo! Boonthanon |
| Scholarship Donor(s) | Swedish Government Through Swedish International Development Corporation Agency ( Sida) |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1996 |