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008			011298s1985 th r 000| 0eng d
035			_a.b10027944
099		9	_aAIT Thesis no.EV-85-26
100	0		_aTrinh Thi Thanh
245	1	2	_aA detailed study of gravel bed flocculator performance
260			_aBangkok : _bAsian Institute of Technology, _c1985
300			_a82 p.
490	1		_aThesis ; _vno. EV-85-26
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1985
520			_aFlocculators 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.
650		0	_aFlocculation
700	1		_aVigneswaran, S., _eChairperson
700	1		_aNguyen, Cong Thanh, _eExamination Committee
700	0		_aSamorn Muttamara, _eExamination Committee
700	0		_aChongrak Polprasert, _eExamination Committee
710	2		_aGerman Academic Exchange (DAAD) Federal Republic of Germamy, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-85-26
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B20025
907			_a.b10027944 _bmnait _cx
902			_a240409
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962			_a000:001:PDF:b1002794:004656:0:0:0:0:0:0 _tAbstract _vn
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