Settling velocity characterization of aquacultural solids
نویسندگان
چکیده
A top-loading settling column is described and used to characterize the settling properties of the solids in the discharge water from a commercial rainbow trout production facility. Mass-based and phosphorus-based settling curves are presented. The median settling velocity on a mass-basis for the settleable solids was 1.7 cm s. The median settling velocity for the settleable phosphorus was 1.15 cm s. Manually stripping fecal material from rainbow trout resulted in settleable solids with a median settling velocity of 0.7 cm s. Examination of the settling velocity curves show that halving the overflow rate (OFR) from 2 to 1 cm s changes the removal efficiency from 0.61 to 0.73, an increase of about 20%. Halving the OFR again to 0.5 cm s increases the removal efficiency to 0.81, an improvement of about 11%. Settling characteristics of aquacultural solids will vary from facility to facility. The methods described in this paper can be used to perform a similar type of analysis at other aquacultural sites, which may be growing other species under different management regimes. © 2000 Elsevier Science B.V. All rights reserved.
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