Douglas-fir bark as a trickling filter medium for animal waste disposal systems Public Deposited

http://ir.library.oregonstate.edu/concern/technical_reports/js956h13z

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Published October 1967. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog:  http://extension.oregonstate.edu/catalog

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  • Douglas-fir bark, 3/4 inch and 1 1/2 inch in size, was tested in recirculating trickling filters 1, 2, and 3 feet in depth, hydraulically loaded at 2.27, 4.54, and 9.08 gallons per minute per square foot (gpm/sq.ft.) with 2 and 4 percent poultry manure slurry at 70° F. Preliminary tests indicated the necessity of allowing the heavier waste particles to settle by gravity. Samples collected at the beginning and at intervals during the run indicated that the reduction of biological oxygen demand (BOD) followed close to the formula BODt = BODo10-tt. Also, as the depth of filter and the rate through the filter increased, the rate of removal of total solids increased. However, the rate of flow through the filter had little effect upon nitrogen removal, as this was influenced by the length of time circulated and the depth of the filter bed. BOD and total solids concentrations lowered at a faster rate when the larger bark was used. There was no indication that the bark increased in either nitrogen or phosphorous during the tests. The turbidity on an average improved from 75 to 4.3 JTU (Jackson turbidity units) for the 2 percent concentrations and from 157 to 16.4 JTU for the 4 percent concentrations in 23 hours.
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