出版社：Grupo de Pesquisa Metodologias em Ensino e Aprendizagem em Ciências
摘要：This work aimed to evaluate the filtering capacity of inorganic nitrogen and phosphorus by biofilter of the macroalgae Ulva lactuca as a function of stocking density in an AMTI system in water recirculation. The macroalgae were cultivated in 20 experimental units, with 5 stocking densities (2, 4, 6, 8 and 10 kg.m-3) and 4 replications. The concentrations of the nutrients ammonia (N-NH3), nitrite (N-NO2), nitrate (N-NO3) and phosphate (P-PO4) were analyzed at the time of interruption of supply (06:00) and after 12 hours (18:00) for evaluation of nutrient filtration. There were no significant variations (p>0.05) between the values of filtration efficiency of nitrogen (EF-N) and phosphorus (EF-P) and of the filtration rate of nitrogen (TF-N) and phosphorus (TF- P) as a function of stocking density. However, an effect (p<0.05) of stocking density on the filtration index of nitrogen (IF-N) and phosphorus (IF-P) was observed, where the highest indexes were observed for the lowest stocking densities. The macroalgae storage density interferes with the nutrient filtration capacity, where lower storage densities provide greater macroalgae filtration capacity.
