03495nas a2200445 4500 20260818090350.0 011298s1985 th r 000| 0eng d .b10027944 AIT Thesis no.EV-85-26 Trinh Thi Thanh A detailed study of gravel bed flocculator performance Bangkok : Asian Institute of Technology, 1985 82 p. Thesis ; no. EV-85-26 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1985 Flocculators are used in water and waste water treatment process to remove turbidity, colour, taste, odour, etc. The gravel bed flocculator performance was studied for various operating parameters such as gravel size, gravel bed height, the approach velocity and for different concentration of Kaolin clay. The performance was studied in terms of turbidity removal efficiency, floc growth and headless development. The removal efficiency for the three gravel sized used ranged 62-94% and the suitable bed depth was found 65.cm. The velocity gradient in the bed increased as flocculation run proceeds due to headless development and it ranged between 18-75 s. The non dimensional parameter, Gt for successful flocculation and suspended solid removal varied from 2 x 10 3 to 2.7 x 10 4 which is lower compared to that in conventional flocculation (10 4 - 10 5 ). Empirical relationships between G, V and T can be formulated from limited number of experiments with the raw water to be treated, which will then be useful in the selection of design parameters. In the present study, such an empirical relationship was formulated for Kaolin clay suspension in the presence of alum. G=0.935 v 0389 t0.24 The gravel bed flocculator can be used with advantage for small communities and villages because it not only achieves uniform intensity of agitation throughout the gravel bed but also does not require any power, mechanical equipment and skilled labour. Flocculation Vigneswaran, S., Chairperson Nguyen, Cong Thanh, Examination Committee Samorn Muttamara, Examination Committee Chongrak Polprasert, Examination Committee German Academic Exchange (DAAD) Federal Republic of Germamy, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-85-26 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B20025 .b10027944 mnait x 240409 2 951012 m a x 2 000:001:PDF:b1002794:004656:0:0:0:0:0:0 Abstract n mnait mnait mnarc 22 40 20 Barcode : 30050120804355 CREATED : 2014-05-28 RECORD # : i12804289 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120224216 CREATED : 2016-09-05 RECORD # : i12972782 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121073794 CREATED : 2023-10-04 RECORD # : i13442570 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 27855 27855 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-85-26 30050120804355 2026-08-18 09:03:50 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-85-26 30050120224216 2026-08-18 09:03:50 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-85-26 30050121073794 2026-08-18 09:03:50 1 2026-08-18 20