Purification of Chlorophyll a in Eutrophic Water by Gafrarium tumidum and the Changes of Nitrogen and Phosphate in Sea Water
The ability of bivalves Gafrarium tumidum filtering algae and its effect on the contents of nitrogen and phosphorus in seawater were studied. The results showed that G. tumidum could eliminate efficiently chlorophyll a in seawater. After 72 h, the elimination effect on algae was remarkable by G. tumidum in seawater with content of N 0.5 mg/L, P 0.04 mg/L and initial algal density 5×106cell/L. After 144 h(6 d), the chlorophyll a in seawater was controlled effectively. When the density of mussels was 1-2 kg per m3, the effect of elimination was the best and the concentrations of nitrogen and phosphate in the water were not increased by the excretion of G. tumidum. The study suggested that G. tumidum is one of economic bivalves for algae control, seawater purification and red tide prevention in tropical and subtropical sea.