Purification of Batik Liquid Waste and Decrease of PB and CD Heavy Metal Content by Combination of Sargassum SP. Biomass and Alum
Batik liquid waste containing Pb and Cd heavy metals is a very dangerous waste and can cause cancer, reproductive disorders, bone fragility, kidney damage, damage to the immune system, anemia and death within 1-2 days. The purpose of this research was to determine the combination of Sargassum sp. and alum in the purification and decreaseof Pb and Cd metal content in batik liquid waste. Waste was taken directly from home-based batik craftsmen in Sesemut-Wiradesa-Pekalongan.This research used a combination of Sargassum sp. and alum in the ratio of 1: 4, 2: 3, 1: 1, 3: 2, 4: 1 in 0.3 grams of total weight. Pb and Cd metals were analyzed by using an atomic absorption spectrophotometer (AAS) while the puritywas measured by using UV-Vis spectrophotometry.The combination of Sargassum sp.: alum (1:4, 2:3, 1:1, 3:2, 4:1) could reduce the Pb and Cd metal content respectively in (83.1%; 98.7%), (77.0%; 99.1%), (82.4%; 99.5%), (76.5%; 99.3%), (80.1%; 99.2%). The best percentage decrease in absorbance was in the combination of 1: 4 (98.5%). This combination was proven to reduce Pb and Cd heavy metals and to purify batik liquid waste.