Beneficial Use of Chicken Shell Residue and Burned Chicken Shell Residue as Coagulants for Heavy Metals Removal from Solution

Abstract

This research was conducted to investigate the optimum condition of chicken eggshell residue (CES) and burned CES at 1-4 hr. for precipitation of Pb (II), Cd (II), Cu (II), and Zn (II) in solution using the Batch method. It was found that CES 1 g. with 96.02±0.39 % CaCO₃ could remove four heavy metals in 25.0 mg/L of each solution with pH 7 and precipitation time of 30 min at %removal (98.30±0.17, 99.96±0.01, 99.98±0.05, and 99.97±0.02), respectively while, 1 hr. burned CES CES1 only 0.5 g. gave the close removal efficiency of four heavy metals at the same condition. Because CES1 had higher calcium oxide. Which is easier dissolved and from hydroxide compound with each heavy metal. Moreover, in mixed four heavy metals solution, CES and CES1 were still removal at the same removal efficiency in each heavy metal solution. Therefore, chicken eggshell residue is more suitable for heavy metal precipitation than chicken egg shells. and can be utilized as a low-cost coagulant for the removal of four heavy metals.