Abstract
From the standpoint of practical application, we examined a concentration procedure for supernatant solutions of jellyfish suspensions using in-vacuo heating. The procedure precipitated high concentrations of Na (sodium) as NaCl (sodium chloride), thereby reducing the Na concentration in the solutions. A larger volume (500 ml) of raw supernatant solutions of Aurelia aurita was concentrated using different concentration ratios and heating temperatures. The rates of decrease for Na and those for other coexisting components were calculated. Results showed that 28-times concentration of the supernatant solutions in vacuo (70 hPa) at 40°C achieved a 69% decrease of Na, but N (nitrogen), P (phosphorus), and Ca (calcium) decreased 23-62% during the procedure. Chingensai plants (Qing geng cai, Brassica rapa var. chinensis) were cultivated using the concentrated solutions as a fertilizer to examine the effect of decreasing Na on chingensai growth. Decreased Na concentrations seemed to reduce the inhibitory effect of Na on the growth of vegetables.
