Archives

  • Archives
  • >
  • Home

DOI : ,    Vol.4, No.1, 13 ~ 25, 1996
Title
The Adsorption of Heavy Metal Ions in Leachate by Chitosan
최환주Hwan Ju Choi,송영일Young Il Song,이성기Seong Key Lee
Abstract
In this study chitosan extracted from shrimp`s shell and it was coagulated and adsorbated with treated leachate from the effluent of second sedimentation in order to check the removal rate of the COD, T-N, T-P, Color and heavy metal ions. The adsorption capacity between 90% and 82% D.A.C. is almost same. And the adsorption capacity of chitosan was Pb(II)> Cu(II)> Cr(VI)> Cd(II)> Zn(II)> Mn(II) at the range of pH 2∼6. The removal rate of each heavy metal was above 85% at pH 2. The reaction completed all about within 10 minute and there after it was slowly increasing the rate of removal. Cr(VI) removal rate was decreased upon pH coming up. In mixed solution, the heavy metal adsorption rate was above 70% at pH 2, and it was above 95% because of the hydroxide sedimentation at pH 12. Chitosan was so good as for the absorbent that the Freundlich`s adsorption isotherm in partly at high heavy metal concentration. COD in leachate was increased at pH 2 condition and maximum removal rate was 36% at pH 4. The maximum removal rate of T-N was 41% at pH 4 and at the other pH range it was about 15-25%. T-P was generally removed about 50% at the acid condition and the maximum removal rate is 73.7% by the 90% D.A.C. The removal rate of color was about 20% higher in 30 than 60 minutes reacted and the maximum color removal rate was 83% in 60min and pH 4. The removal rate of heavy metal was lower in the mixed solution than that of the single solution.
Key Words
pdf view PDF