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ผู้เขียน หัวข้อ: Micro-particles in recirculating aquaculture systems: particle size analysis of  (อ่าน 2501 ครั้ง)
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« เมื่อ: เมษายน 05, 2010, 09:56:45 AM »

Micro-particles in recirculating aquaculture systems: particle size analysis of culture water from a commercial Atlantic salmon site

R. N. Patterson  and K. C. Watts

Faculty of Engineering, Dalhousie University, PO Box 1000, Halifax, NS, Canada B3J 2X4
Received 28 July 2002;  accepted 15 January 2003. ; Available online 15 March 2003.

Abstract
As part of a larger study of micro-particles in a recirculating, cold water aquaculture system for juvenile Atlantic salmon (Salmo salar), particle size analyses were carried out on the culture and makeup waters over several months followed by samples of feed stirred in water. The particle size distributions followed the power law described in [Aquacult. Eng. 19 (1999): 259] but with a superimposed spike at around 4 μm in the culture water, which was not present in make-up waters. A similar spike appeared in the feed samples indicating that the spike had a feed origin. While the absolute value of the power law exponent (designated β, or the Beta value) was in the range of 2.6–3.6, consistent with aquacultural waters, the build-up of fine particles, expected in a recirculating system with time and which would have been indicated by an increase in Beta value to above 4, did not occur due to a system high water turn-over rate flushing much of the finer particles. There is a particle counts increase occurring across the degasser/oxygenator that needs further investigation.

Author Keywords: Atlantic salmon; β-Value; Degasser/oxygenator; Particle size analysis of culture water

Aquacultural Engineering
Volume 28, Issues 3-4, August 2003, Pages 99-113
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