Comparison of Total Suspended Solid (TSS) reduction in acid mine drainage (AMD) using alum and eco enzyme Christin Palit(a), Suliestyah(a), Reza Aryanto(a), Kevin Nathaniel(a), Bambang Cholis Suudi(b), Shahrul Nizam Ahmad(c)
(a)Department of Mining Engineering, Faculty of Earth and Energy Technology, Universitas Trisakti, Jakarta, Indonesia
(b)Department of Industrial Engineering, Faculty of Industrial Technology, Universitas Trisakti, Jakarta, Indonesia
(c)School of Chemistry and Environment, Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
Abstract
Acid mine drainage (AMD) is liquid waste from mining activities that has a very low pH and contains very high total suspended solids (TSS). TSS reduction experiments were carried out using eco enzyme which are easy to make, cheap, and minimize the occurrence of sludge deposits. Eco enzyme were made from 50% papaya, 40% dragon fruit, and 10% orange peel. The fermentation process lasts for 3 months using a composition of water, fruit peel, and molasses of 10:3:1. Eco enzyme characterization includes pH, bacteria killing power, and amylase and cellulase enzyme activity. Optimization of operating conditions for treatment was carried out using variations in dose, time, pH, and shaker temperature, with an initial TSS level of 1200 ppm. The research results show that the optimal conditions for treatment using alum are a dose of 0.03 grams/200 mL, a contact time of 5 minutes, a solution pH of 7, and a shaker temperature of 25oC, resulting in a TSS reduction between 92-97%. The optimal conditions for treatment using eco enzyme are a dose of 10 mL eco enzyme/200 mL, a contact time of 5 minutes, a solution pH of 4.5, and a shaker temperature of 30oC, which produces a TSS reduction between 93-97%. The weight of the sediment that occurs after treatment using alum is 2-2.3 grams per 200 mL, while in treatment using enzymes, it is 0.2-0.6 grams per 200 mL of AMD. This shows that treatment using eco enzyme is more effective than using alum.
Keywords: acid main drainage, total suspended solid, alum, eco enzyme, and enzymes activity
