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

Abstract

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.