Title page for ETD etd-07092009-141241


Type of Document Dissertation
Author Saidu, Milton Maada-Gomoh
Author's Email Address msaidu1@tigers.lsu.edu, maadasaidu@hotmail.com
URN etd-07092009-141241
Title Temperature Impact on Nitrification and Bacterial Growth Kinetics in Acclimating Recirculating Aquaculture Systems Biofilters
Degree Doctor of Philosophy (Ph.D.)
Department Engineering Science (Interdepartmental Program)
Advisory Committee
Advisor Name Title
Steven Hall Committee Chair
Fred Aghazadeh Committee Member
Robert Justis Committee Member
Ronald Malone Committee Member
Terrence Tiersch Committee Member
Bruce Sharky Dean's Representative
Keywords
  • aquaculture
  • temperature regime
  • bacteria
  • ammonia nitrogen
  • recirculating systems
Date of Defense 2009-05-13
Availability unrestricted
Abstract
This project assessed short-term temperature effects on total ammonia nitrogen (TAN) utilization rates in a batch laboratory-scale recirculating system. The tank system was designed for experiments on short term steady state and diurnal temperatures. A set of numerical models was developed to simulate observed results. The performance of the biofilters was determined with three tank replicates at fixed temperatures of 13, 20 and 300C; and at diurnal transient (sinusoidal) temperature regimes of (20 30C; 30 30C). Ammonia utilization rates and biofilter performance for beads acclimated at different temperatures regimes separated and mixed were also determined. Total ammonia utilization rates increased with increased temperatures. The ammonia removal rates (Pseudo Zero Order) with slope (K) did not significantly differ (P > 0.05) for 130C (K = -0.02) and 200 C (K = -0.04); but differed (P < 0.05) for 13 and 300C (K = -0.12) and also differed (P<0.05) for 200C and 300C. Diurnal temperatures values differed (P = 0.001) for 200C 30C (K = -0.08) and 300C 30C (K = -0.19). Ammonia utilization rate values for beads that were acclimated and mixed at temperatures of 13, 20, 300C and subjected to diurnal temperatures differed (P = 0.024) at 200C 30C (K = -0.12); and 300C 30C (K = -0.36). Biofilter performance increased with temperature linearly with increased performance occurring at higher temperatures and high bacterial mass. Ammonia utilization rate simulated models matched the observed data and assisted in determination of bacterial mass. Future designs and acclimation of the bead filters may be further enhanced by decreasing biofilter acclimation periods using higher temperatures in recirculating systems.
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