| dc.description.abstract | Glycerol residue or frequently known as Pitch is a waste resulted from down stream product of crude glycerin distillation. With the increasing need of pure glycerin
in the world, the glycerol residue produced is also in.creasing. Glycerol residue is solid
waste at the room temperature, highly alkaline (pH> 13), corrosive, and categorized ac;;
waste B3. In this research, the researcher made acetic acid from glycerol residue
through the anaerobic fermentation process by using non-sulfur purple photosynthetic
bacteria. The purpose of this study was to find out the influence of glycerol residue
concentration change on time and to find out whether or not the glycerol residue can
be utilized as acetic acid. In the rese~ch, 400 grams of glycerol residue were first
diluted with 200 ml of distilled water to change the physical nature of glycerin, from
solid to liquid, at room temperature then it was acidified by using hydrochloric acid up
to pH2. The top layer formed was fatty acid and triglycerides which should be
removed while the bottom layer was the diluted glycerol residue which was then
neutralized with caustic soda. To produce acetic acid, glycerol residue with
concentration 0.5%, 1.0%, 1.5%, salt and 5 ml non-sulfur purple photosynthetic
bacteria were put into a 100 ml bottle which had been previously sterilized, then it was
incubated for 4 (four) weeks under the light of 40 watt bulb. The result of this research
showed that the acetic acid produced were acetic acid 0.28% a/s (acetic acid
weight/sample weight), 1.85% (a/s), and 0.25% (a/s) for glycerin with concentration of
0.5% (a/s), 1.0% (a/s) and 1.5% (a/s) on the 28th day. | en_US |
