Graduate Thesis Or Dissertation

 

The wastewater treatment characteristics of a rotating flighted cylinder Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hd76s2564

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  • The rotating flighted cylinder (RFC) was investigated as a potential wastewater treatment deVice. A RFC is a rigid tube with a helically-wound fin attached to the interior surface and operates by flowing wastewater through the tube as it rotates. An 8-inch and 24-inch diameter RFC was tested for solids-liquid separation, oxygen transfer, and removal of organic matter. The 8-inch RFC did not separate solids from liquid to any meaningful extent. The 24-inch RFC did show significant solids-liquid separation and appeared to prevent sloughed biomass from exiting with the cylinders lower effluent. Total oxygen transferred to the liquid was enhanced by increasing rotational speed and flow through the cylinder. Oxygen appeared to be transferred by other mechanisms not exhibited in the recreation tests. BOD removal exceeded the oxygen made available according to these tests. The 8-inch RPC obtained 90% BOD₅ and 80% COD removal at equivalent flow rates of .01 liter per minute. The 24-inch RPC was able to achieve over 90% BOD₅, removal within a four to eight hour retention time with a volume of 500 liters, Continuous flow treatment yielded soluble BOD₅ removals above 90% but high suspended solids kept total BOD₅ removal around 70%. On a loading per sur- 5 face area basis the biological capabilities of the RFC upppears similar to the rotating biological discs. Nitrification was not significant during treatment. Operational and capital costs make the unit a feasible package plant alternative.
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