THE APPLICATION OF EMULSION LIQUID MEMBRANE (ELM) ON THE CHROMIUM EXTRACTION
DOI:
https://doi.org/10.36499/jim.v3i1.673Abstract
One of heavy metal compounds that widely used in industry is Chromium. Chemical orbiological treatments are not yet able to deal with the problems caused by heavy metal
pollution. Taking the expensive heavy metal such as chromium, nickel, and mercury from the
waste water and then re-used the recovered heavy metal is the effective method in treating
waste water with expensive heavy metal on it. One of the methods that can be applied is by
using Emulsion liquid Membrane (ELM).The objectives of this research were to determine
the most influencing variable and to determine the optimum condition of the extraction
process. The process variables tested in this research conducted were carrier concentration,
external phase acidity and stripper concentration on the internal phase. While the fixed
variables were ratio of emulsion and external phase volume and agitation time of the
permeation step. The research was conducted in a stirred tank and divided into three major
step which were the membrane stability test, the determination of the variable that gave the
most dominant influence to the chromium recovery on the membrane condition which was
achieved from the first step, and the third step was optimization of the most influencing
variable on the chromium extraction process, while the optimum condition for the chromium
extraction from liquid waste water were the concentration of chromic acid in the external
phase was 600 mg/L, the stripper concentration in the in internal phase was 3 M, agitation
time was 15 minutes, the volume ratio of the emulsion and the external phase was 1:3 and the
carrier concentration was 0.049%.
Key words : chromium, emulsion liquid membrane, extraction
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