Pemendakan Logam Karbonat I: Kesan Pencampuran Logam

The objective of this study is to determine the metal solubility trendfor each metal either treated individually or in mixed metals. Through this investigation, a range of optimum pHfor treating wastewater containing heavy metals by carbonate precipitation can be determined so that the treatment can be performed effectively and economically. The precipitation process for the synthetic wastewater was carried out through acidic to an alkaline medium by using sodium carbonate asthe precipitating agent. Aliquots of wastewater sample were taken at every increment of pH value before being filtered out. The residual metal concentrations in the filtered samples were analyzed by using Atomic Absorption Spectrophotometer (MS) (Model FlAs-100, Perkin Elmer, U.S.). The results showed that the alkaline medium provides the most conducive environment for the removal of every metal regardless of whether the metals were treated individually or mixed metals. It was found that the optimum pH range for the removal of metals in a mixed metal system did not show any significantdifi erences after being compared to the optimum pH range for the removal of metals individually. However, the optimum pH range obtained for the removal of all metals simultaneously in a mixed metal system is 8.0 - 10.0. Moreover, metal removal in a mixture system begins at a lower pH value, several units below the pH at which precipitation first becomes apparent in the individual metal system.