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Air sparged hydrocyclone flotation f...

Niewiadomski, Marcin Michal.

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Air sparged hydrocyclone flotation for oily wastewater treatment.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Air sparged hydrocyclone flotation for oily wastewater treatment./
作者:	Niewiadomski, Marcin Michal.
面頁冊數:	228 p.
附註:	Adviser: Jan D. Miller.
Contained By:	Dissertation Abstracts International67-09B.
標題:	Engineering, Environmental. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3235765
ISBN:	9780542901843

Air sparged hydrocyclone flotation for oily wastewater treatment.
Niewiadomski, Marcin Michal.

Air sparged hydrocyclone flotation for oily wastewater treatment. - 228 p.

Adviser: Jan D. Miller.

Thesis (Ph.D.)--The University of Utah, 2006.

Adsorption of dextrin may require very long times at the order of hours to achieve an equilibrium and conditioning time should be appropriately planned.

ISBN: 9780542901843Subjects--Topical Terms:

783782
Engineering, Environmental.

Air sparged hydrocyclone flotation for oily wastewater treatment.
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245 1 0 $a Air sparged hydrocyclone flotation for oily wastewater treatment.
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520 $a Adsorption of dextrin may require very long times at the order of hours to achieve an equilibrium and conditioning time should be appropriately planned.
520 $a Further improvement in oily wastewater treatment by ASH technology can be achieved by ASH design improvements and by the chemical control of flocs stability.
520 $a The commercial BAF system (Empacadora Mar, Ensenada, Mexico) was very efficient in the removal of suspended solids and oil (96 to 99%); however, colloidal pollutants of size below 1 mum remained in the wastewater.
520 $a This study investigates froth flotation of dispersed oil in the air sparged hydrocyclone (ASH). Several topics are considered: air bubble and oil droplet interactions in a centrifugal force field, adsorption of flotation reagents at interfaces, froth properties in the presence of dispersed oil, effect of ASH design and operating variables, plant evaluation of a modified ASH system, bubble accelerated flotation (BAF), in the treatment of fish processing wastewater.
520 $a Air bubble and oil droplet encounter occurs only due to interception; however, the efficiency of encounter is reduced by gravitational action. Collision contact times are less than 0.14 ms and cannot account for attachment that requires at least 2 ms. Sliding contact times vary from below 1 ms to almost 400 ms and can lead to film rupture/attachment.
520 $a Dispersed oil significantly increased froth collapse rate; however, the dynamic stability was less affected, which is beneficial for ASH flotation. Silica particles wetted by oil increased froth collapse rate, but had negligible effect on dynamic froth stability.
520 $a Oil recovery in the 1-inch ASH was significantly lower than for the 2-inch ASH, 0.6% compared to 6.6% when unaided by flocculation. Higher centrifugal acceleration in the 1-inch ASH and the higher dissipation of energy were responsible for decrease in flotation efficiency. Polymeric flocculation yielded over 40% oil recovery in the 1-inch ASH.
520 $a Flocculation with cationic polymers was required for satisfactory oil removal by ASH technology. Batch cell experiments needed a dosage of 1 ppm, while ASH tests required 10 ppm. Efficient oil removal (96-100%) by BAF could be attained using over 50 ppm of cationic flocculant.
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