The Effect of The Utilization of Gambier Processing Wastewater for Tannery with Variations of Alum and Tunjung on Physical Properties Test

Abstract

Abstract The study involved variations in the percentage of alum and tunjung added as mordants, with percentages of 0%, 2%, 4%, and 6% used during the processing of wastewater from gambier. To evaluate the physical properties of tanned leather, the researchers followed the SNI 06-0463-1989-A. The findings indicated that using alum (aluminium sulfate) and tunjung (ferrous sulfate) as mordants affected the physical properties of tanned leather. Alum yielded better physical properties compared to tunjung, as evidenced by the higher tensile strength and flexural strength/elongation in the tanned leather treated with alum. The physical properties of tanned leather were found to be significantly influenced by the percentage of alum used, with higher percentages resulting in increased tensile strength and decreased flexural strength. The most effective treatment involved adding 2% alum, which suggests that combining gambier processing wastewater with alum can be a viable method for tanning leather. These findings demonstrate the potential for using alternative chemicals in leather tanning, which may offer benefits in terms of cost and environmental impact.