Purifying effect of reed wetland ecosystem on Pb in papermaking wastewater

The distribution of Pb in papermaking wastewater, wetland soil, and reeds tissue is analyzed on the basis of the sampling from the reed wetland of Shuangtai river and the simulation experiments at the lab pool of Shenyang agricultural University. The result shows that (i) during the whole growing period of reeds, Pb's removal rate was the highest with a wastewater-irrigation in the concentration of 20%; at the jointing stage of reeds, the best removal effect occurred, Pb content in water was the least and purifying effect was most significant with a water depth of 10cm; (ii) Pb's thermodynamic adsorption process was significant(p=0.01, n=8) in different soil depths. Pb's adsorption property was the best with a soil depth of 10cm and purification effect was most significant; (iii) in different growing seasons, the influence order of reeds tissue on Pb's absorption property was root>stem>leaves.