Research Of The Removal Of Phaeocystis Globosa Red Tide By Several Chemical Algaecide

The Phaeocystis globosa red tide is a kind of harmful and poisonous red tide in China, so it is urgent for us to find out an effective method to remove the Phaeocystis globosa red tide. It is a new way to use iodine witch is absorbed on some carrier to remove red tide.We used several organic algaecides to remove the Phaeocystis globosa red tide. The results showed that povidone-iodine can release iodine slowly to kill and control the P. globosa red tide. The minimum used levels are 30mg/L if we added the povidone-iodine algaecide at the prophase of logarithmic phase. The povidone-iodine was combined with bromogeramine or isothiozolone in order to reduce the cost and increase the efficiencies of removal. The ideal composite concentration is povidone-iodine: bromogeramine is 3.0mg/L:1.5mg/L, and povidone-iodine: isothiozolone is 1.0mg/L:0.15mg/L.We studied the removal mechanism of algaecides. The results show that the algaecides can react with the chlorophyl a , the protein and the SOD enzyme, and also can destroy the modality of the algae.Soluble chitin-iodine was also discussed. The results show that soluble chitin-iodine can remove the P. Globosa red tide.