| Author | Hsieh, Kauo-hsiang |
| Call Number | AIT Thesis no.EV-80-11 |
| Subject(s) | Filters and filtration--Mathematical models
|
| 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 |
| Abstract | A flow pattern investigation and two equations for predicting turbidity reduction in the horizontal prefilter are presented in this study. The turbidity removal of the artificial turbid influent which was prepared by mixing the tap water with Kaolin-Clay is affected by four
parameters in this study. There are flow rate (Q) , size of filter coarse medium (d), length (L) and depth (D) of filter medium. The most predominant parameter of them affecting on turbidity removal through horizontal prefilter is length of filter medium (L), follow by flow rate (Q), size of filter coarse medium (d) and depth of filter medium (D) . The first empirical equation based on Reynold's Number can be expressed as follows:
2 3
p = 100 - Re + (Re) - (Re)
8.3 74 209
where p = turbidity reduction
Re = Reynolds' Number in porous medium
The second equation was derived from Hazen's (1904) concept indicating that turbidity reduction in filter was achieved by pores which are considered as a series of subdivisional. sedimentation units. It is
presented as:
-n
p = 1 - (1+1 x v )
n D/ta
where n = the number of subdivisional sedimentation units
td = detention time
And in the tracer study, real detention time was found approximately to be half of theoretical detention time, because of the short-circuiting
and dead-zone in this filter. |
| Year | 1980 |
| Type | Thesis |
| School | School of Engineering and Technology |
| 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) | Nguyen, Cong Thanh ; Watanabe, Yoshimasa
|
| Examination Committee(s) | Lohani, Bindu N.
|
| Scholarship Donor(s) | Taiwan Power Co., Ltd., R.O.C. |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1980 |