Preliminary Studies On The Removing Of Triazophos From Water By Canna Indica And Acorus Calamus

The abilities of Canna indica and Acorus calamus in removing organophosphate pesticides triazophos (TAP) from water were studied in hydroponics. The protein contents, peroxidase activities, malondiadehyde contents and phosphatase activities of plants' roots under different TAP concentrations were exzamined, the affection of TAP on two plants' physiological and biochemical index was analysed. The changes of TAP concentration in different treatments and at different initial concentrations were monitored. The disappearance rate constants (K) of TAP in the planted systems were calculated, the effects of plants and microoganism were analysed through the comparison of different Ks among unplanted systems, microoganism systems and planted systems. The phytoremediation ways of plants in removing TAP from water were discussed. The main results were shown as follow.1. TAP will affect the physiological indices such as protein contents, peroxidaseactivities, malondiadehyde contents and phosphatase activities of C. indica and A. calamus. Lower TAP concentration will stimulate plants' physiological activities, while higher TAP concentration will injure the plants.2. The K values of 1mg/L TAP treatment were 0.0229/d in the C. indica systems, and0.0143/d in the A. calamus systems, respectively. Based on per unit biomass, the removal effect of A. calamus was better than C. indica.3. The contributions of hydrolysis, microbion and C. indica on the degradation ofTAP were 8.7%, 25.8% and 65.5%, respectively. Those of hydrolysis, microbion and A. calamus were 13.9%, 41.3% and 44.8%, respectively.4. In the C. indica systems, the degradation of TAP was faster and the phosphataseactivities of plants' roots were higher in the treatments without- than with- the addition of inorganic phosphorus. And there were significant positive correlationships between the changes of TAP concentrations and the phosphatase activities of plants' roots. In the A. calamus systems, the difference of TAP degradation between treatments without- and with- the addition of inorganic phosphorus was small. But relationships between the changes of TAP concentrations and the phosphatase activities of plants' roots and in the water were very significant and positive.