03419nam a2200421 4500 20260818090310.0 151098s1980 th r 0000|0 eng d .b10192633 AIT Thesis no.EV-80-11 Hsieh, Kauo-hsiang Design parameters for horizontal prefilter Bangkok : Asian Institute of Technology, 1980 vi, 89 p. Thesis ; no. EV-80-11 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, school of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1980 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 follow: 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. Filters and filtration Mathematical models Nguyen, Cong Thanh, Chairperson Watanabe, Yoshimasa, Co-Chairperson Lohani, Bindu N., Examination Committee Taiwan Power Co., Ltd., R.O.C., Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-80-11 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B21969 .b10192633 mnait x 250321 2 951012 m a x 0 mnait mnarc mnait 22 40 14 Barcode : 30050120656318 CREATED : 2014-06-02 RECORD # : i12758334 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120226468 CREATED : 2016-04-27 RECORD # : i12958517 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120903785 CREATED : 2020-07-29 RECORD # : i13285233 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 27582 27582 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-80-11 30050120656318 2026-08-18 09:03:10 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-80-11 30050120226468 2026-08-18 09:03:10 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no.EV-80-11 30050120903785 2026-08-18 09:03:10 1 2026-08-18 14