Adsorption Pollution Leather Tanning Industry Wastewater by Chitosan Coated Coconut Shell Active Charcoal

Besides having advantages, Chitosan as biosorbent has also disadvantages. . Chitosan is very soluble in low pH so it cannot adsorb Cr (total) at low pH. It is due to active site (amine group) of chitosan undergo protonation and its adsorption capability is easily influenced by anions in waters. The research studied use of chitosan coating active charcoal of coconut shell to increase adsorption capability of Cr (total), BOD, COD. This research was done to evaluate characteristic of liquid waste quality with IPAL or without IPAL and compare with Regulation of DIY Governor number 7/2010. It studied also effect of pH and Concentration of chitosan coating active charcoal as adsorbent on decrease in Cr (total), BOD, and COD concentration on liquid waste of leather tanning. The results indicate liquid waste of leather tanning industry with IPAL and without IPAL have exceeded quality standard of liquid wast e of leather tanning industry. ANOVA statistical test indicated Cr (total), BOD, COD are significant at 5% (p<0.05), various pH influenced decrease in Cr (total), BOD, COD. The highest removal percentage on effect of chitosan concentration coating active charcoal is obtained in adsorbent C (K3A1), Cr (total) (99.19%); BOD (99.95%); COD (99.825%)