Evaluation of different drainages in circular tanks for trout culture in recirculating systems
Abstract
The evaluation of different alternatives for effective solids capture and removal in fish culture tanks of recirculating systems becomes important as the first mechanism to guarantee an appropriate wastewater treatment and their subsequent dumping or reuse. The main objective of this research was to evaluate during a month the apparent solids removal performance on 12 fish culture tanks of 250 L in a recirculating aquaculture system with four different drainage systems: D1-bottom perforated tube with lateral outlet and external stand pipe, D2-external stand pipe, D3-internal stand pipe, D4-double drainage, and three hydraulic detention time Q1, Q2 and Q3 equivalents to one exchange each 25, 50 and 82 minutes. The experiment was done with rainbow trout fries for an initial biomass of 1,6 kg/m3 feed daily at a rate of 3% of living weight, the parameters dissolved oxygen, temperature and pH were monitored. There were significant differences between tanks for drainages and hydraulic retention times, the best results were obtained for the D3-Q1, which combination reported an average solids removal efficiency of 88,02%, followed by the D1-Q1; the treatment with the lower efficiency was the made up by the D2-Q3.Downloads
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