Removal Efficiencies of Nitrogen and Phosphorus in the Microcosm with Artificial Floating Island of Iris pseudoacorus

초록

The removal efficiencies of N and P by artificial floating island of Iris pseudoacorus L. were examined in three different microcosms with 6 L of polluted pond waters - control, addition of floating coir mat in the size of 20×20 cm, and addition of floating mat planted with four plants of I. pseudoacorus. During the incubation of 7 days the removal percents of total-N were 66% in the microcosms with floating mat and 88% in those with floating island of I. pseudoacorus. The removal percents of total-P were 41% in the microcosms with floating mat and 61% in those with floating island. The daily removal rates of plants were decreased from 294 ㎍·g-1 DM·day-1 to -87 ㎍·g-1 DM·day-1 for total-N and from 4.0 ㎍·g-1 DM·day-1 to -0.4 ㎍·g-1 DM·day-1 for total-P during the incubation. Our results showed that the artificial floating islands could be applied as a useful eco-technique to restore water quality of aquatic ecosystems such as ponds, lakes, and reservoirs.