Contact time and reaction rates for trickling filters Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tx31qn35s

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  • Three deep experimental filters were used to evaluate the influence of the physical factors of media size, depth of filter, and organic and hydraulic loading on contact time and the rate of removal of organic material by the biological growth on the filters. A further correlation was made between contact time and the COD removal rates. The experimental filters were three columns, 5.8 inches in diameter and 18 feet in depth. Each column was packed with a constant size, smooth, spherical media. The media used were 9/16-, 7/8-, and 1-1/4-inch diameter marbles. Tracer studies for contact time were made on the columns at 2-, 4-, 8-, and 16-foot levels and at hydraulic loadings ranging from 15-90 mgad. Sodium chloride was used as the tracer material. Contact time was determined for the three sizes of media without biota and for the 7/8-, and 1-1/4-inch diameter media with biota. Samples of the substrate were taken at the various levels and flow rates for COD determination for the tests run on the media with biota. A step-wise regression analysis was performed on the data with the use of an IBM computer. Two empirical relationships were established for contact time, one for the media without biota and the other for media with biota. A further empirical relationship correlated the COD remaining with the contact time. The results of this analysis showed that contact time on the media without biota is inversely proportional to the 0.76 power of the hydraulic loading, inversely proportional to the 0.50 power of the diameter of the media, and directly proportional to 1.08 power of the filter depth. Contact time on media with biota is inversely proportional to the 1.05 power of the hydraulic loading, and directly proportional to the 1.44 power of the filter depth. The third empirical equation established a relationship for COD remaining as a function of time, where the fraction of COD remaining is inversely proportional to the 0.19 power of the contact time.
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