| Author | Fan, Soo-thin |
| Call Number | AIT Thesis no. 634 |
| Subject(s) | Sewage--Purification--Filtration
Filters and filtration
|
| Note | A thesis submitted-in partial fulfillment of the requirements for the degree of Master of Engineering in the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | Field study of pilot scale two-stage water filters using washed
and reused coconut husk fiber as roughing filter medium and burnt rice husk as polishing filter medium was conducted. It was found that this water treatment system can achieve filtrate quality which met recommended International Standards for Drinking Water for most surface waters in terms of turbidity, color, taste and odor. but not coliform index. A small- dosage of chlorine would be required to make the treated water
absolutely safe for drinking.
Filter performances using coconut husk mat as roughing filter medium was studied in laboratory scale plant and was found not a good substitute for shredded coconut fiber as roughing filter medium in two-stage filters. Parameters, such as particle size distribution in water, coagulant demand, and filtrability index were developed to predict the treatability of water sources to be treated by this water treatment system. It was found that raw waters with less than 50 percent of <7
microns particle, coagulant demand not more than 80 mg/l, and filtrability index less than 0.005 will be well treated. Some microorganisms in burnt rice husk such as Diatoma, Pelomyxa, and Anaccystics were
identified Effective size, coefficient of non-uniformity, surface area, and porosity of burnt rice husk was also investigated. Some economic aspects of two-stage filters were studied. Information obtained in this study showed that investment costs were much
less than conventional water treatment plants with comparable size in the same area. Operating costs, however, were only slightly less than
that of conventional plants.
Experiences and problems encountered during the study were listed and discussed. |
| Year | 1974 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Nguyen Cong Thanh ; Pescod, M.B. |
| Scholarship Donor(s) | Lee Foundation of Singapore |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1974 |
