Purification of Some Heavy Metals from Paper-Making Wastewater by Reed of Shuangtai Estuary Wetland

摘要

Through sampling reed in Shuangtai estuary wetland in April, 2009 and simulation test in Shenyang Agricultural University, we analyze the removal efficiency of Cu, Zn, Pb and Cd during different growth period of reed and distribution of them in various parts of reed. The results show that the removal efficiency is best in jointing stage, the removal of Pb largest with 21% increase and 30% in sprout and exhibition leaf period, the removal of Zn largest with 53% and 29% increase in jointing stage and the maturity period, the removal of Cd largest with 40% increase in the different growing season. The absorption amount of Cu, Zn, Pb and Cd in roots of reed reaches maximum during the growth, followed by in stems and in leaves. Absorptive capacity in the whole plant for Cu, Zn, Pb and Cd exists extremely significant difference (p<0.01). The order is Pb>Zn>Cu>Cd. The absorption in root is higher than in stems and in leaves (p<0.05), but Zn and Cd absorption amount has no significant differences in stems and leaves (p>0.05).