Abstract
Various chemicals used in Chemical Oxygen Demand (COD) analysis carried out in laboratories produce highly acidic waste containing lots of heavy metals, including mercury and chromium. The goal of this study is to analyze the influence of zeolite on changes in the level of mercury and chromium using adsorption method. The research was carried out with a completely randomized block design. The data was then analyzed using the effectiveness formula and Completely Randomized Block Design ANOVA. The results showed that zeolite could reduce the level of mercury and chromium, with stirring time and the amount of zeolite used as other influential factors. When 0.0017 mg/L of mercury was used, environmental quality standard was achieved when 20 g of zeolite was added, with stirring time of 180 minutes. Meanwhile, when 0.4113 mg/L of chromium was used, only 5 g of zeolite was needed, with stirring time of 180 minutes, to reach the environmental quality standard for chromium. Keywords: zeolite, mercury, chromium, adsorption, weight, and stirring time
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