INVESTIGATION ON CALCIUM AND MAGNESIUM IN TRADITIONAL SALT PLOTS: PROMOTING UTILIZATION WASTE BY-PRODUCT

Calcium and magnesium are two major anions found in seawater naturally after chlorine and sodium. Calcium and magnesium widely used for industrial and human health. Seawater salt productions produce salt and wastewater as concentrated sea water. Sodium and chloride produced as salt from seawater in traditional salt production while calcium and magnesium need to be considered for promoting recovery mineral. As alkaline earth metal, calcium and magnesium potentially interfere with each other in the chemical process. The investigation was conducted at the peak of the dry seasons in Indonesia by collecting a water sample from each plot in traditional salt production. Each water sample measured using complexometric titration and hydrometer to count its density. The objective of this study is to prove calcium and magnesium behavior in traditional salt productions in Indonesia with a view to achieving integrated production of salts and mineral from sea water. This information can support marine environment sustainability through recovery from traditional salt production wastewater. During evaporation, calcium concentration increases but starting from BE 13-16 will get down. Magnesium concentration increases steadily during the salt-making process. Recovery magnesium from bittern has advantages since calcium ion as impurities have deposition at 53.5% seawater evaporation.