ConclusionsThe results obtained dur

Conclusions
The results obtained during this study have shown that heavy
metals accumulation in the aboveground biomass of P. arundinacea
growing in a constructed wetland treating municipal sewage varies
substantially during the season and also among heavy metals. It
seems that various heavy metals follow different seasonal pattern
and therefore, it is not possible to find optimum time for harvest
during the year in order to obtain maximum removal of all heavy
metals at the same time. Despite low aboveground biomass in the
early growing season, some heavy metals exhibited the highest
level of accumulation at this time. Appropriate time for harvest
may optimize removal of heavy metals in constructed wetlands.