Restoration of Soil Contaminated by Acid Mine Drainage using Thiobacillus sp and Clostridium sp Effective Bacteria M.C Ozcar, B Iswanto, A Rinanti*
Environmental Engineering Department, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti, Jakarta, Indonesia
Abstract
The mining industry in Indonesia in recent years has grown rapidly, causes a emergence problem of environmental pollution on the land around the mining site that is polluted by acid mine drainage. The most dangerous effect of acid mine drainage is the high accumulation of metals in land revegetation. The method for recovering land contaminated by acid mine drainage that used in this study is bioremediation using effective bacteria Thiobacillus sp and Clostridium sp. The core of this research is to find optimum environmental conditions (contact time, pollutant concentration, and bacterial concentration) to degradate acid mine drainage, which is that effective bacteria contacted with soil contaminated by acid mine drainage under optimum environmental conditions with variations of time. The results showed that the optimum environmental conditions for effective bacteria to degradate acid mine drainage were 48 hours contact time, 60% pollutant concentration and 40% bacterial concentration. The results of this study is the effective bacteria efficiently recover soil contaminated by acid mine drainage within 48 hours as evidenced by an increase in pH from 2 to 6, a decrease in Fe content from 3.6 mg/L to 0.27 mg/L, and decreased Mn levels from 3.2 mg/L, to 0.31 mg/L.
