EFFECT OF A PHOTOCATALYTIC COMPOSITE COUPLED WITH POTAMOGETOR CRISPUS ON CONTROL SEDIMENT PHOSPHORUS

The treatment efficiency of phosphorus (P) in a sediment with the joint action of a new photocatalytic composite Sr-TiO2/PCFM and submerged macrophyte was studied for the first time in Donghu Lake. Wuhan, China. The results showed that Sr-TiO2/PCFM prepared by the sol-gel process exhibited a strong photocatalytic capacity. The dosage of Sr-TiO2/PCFM, irradiation, operation temperature, reaction time and pH were the principal factors affecting the removal of each sediment P forms by Sr-TiO2/PCFM. The synergistic effect of Sr-TiO2/PCFM and submerged macrophyte Potamogetor crispus on the sediment P under irradiation and control conditions showed that the removal rates of each P form have been further enhanced after irradiation. The unity of Sr-TiO2/PCFM and Potamogeton crispus plays a more important role in removing the sedimental P than the summation of Sr-TiO2/PCFM and Potamogeton crispus used separately under the irradiation conditions. The results suggested that the united technology of Sr-TiO2/PCFM and submerged macrophyte could be further applied to the treatment of endogenous P pollution in eutrophic lakes