Effect of Light Metal Ions and Competition among Heavy Metal Ions during the Adsorption of Heavy Metal Ions by Bark

When the light metals such as and were added to heavy metal solution, the adsorption of heavy metals was increased by 20 to 30% more, but there were no differences between species. was the most adsorbed metal(99.5%), and the adsorption ratio of was significantly improved. In addition, when the light metal concentration was increased to 100ppm, the adsoption ratios of all four heavy metals were reached to 92 to 99%, while coniferous barks showed only 85 to 92%. On the mixture of four heavy metals, the adsorbed amount of each metal was significantly reduced, compared with that of one heavy metal, while showed the adsorption improvement to 95%. On the column experiment, was almost completely adsorbed in the upper part of column, and the adsorbed amount of was gradually decreased depending on column depth. However, and were not influenced by column height, and constantly adsorbed on various column height. Based on the above results, each heavy metal had different adsorption mechanism.