活魚輸送・蓄養における泡沫分離法の飼育海水浄化能

概要

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The foam separating system was examined in terms of the removability of pollutants from fish-rearing seawater in living fish transportation and preservation. The foam-separating system consisted of fish-rearing tank (seawater volume of 890 l; sea bream Pagrus major weight of 50kg), a circulation pump, an air-inhale-discharge-type aerator unit, a foam-separating unit and a filtering unit. The fish-rearing seawater and separated foam wastewater were analyzed every 3-6h for two days. The pH, DO, turbidity, NO3-N, NO2-N, total viable bacteria, and vibrios in fish-rearing seawater were maintained for two days at 7.5-7.9, 7.2-7.4mg/l(17°C), 1-2 TU, ND-0.005mg/l, 0.01-0.08mg/l, <105 CFU/ml, and 20-30CFU/ml, respectively. The concentrations of dissolved organic carbon (DOC) and NH4-N were 21.5mg/l and 9.0mg/l after fish rearing for two days. Turbidity, DOC, total viable bacteria, and vibrios were removed effectively by foam-separating system. The volume of foam wastewater removed during the two-day period was only 1.2% of the initial volume of fish-rearing seawater. The foam-separating system was very effective in removing pollutants from the fish-rearing seawater.
日本水産學會の論文