| Abstract | Acid mine drainage (AMD) was contained very low pH, toxic trace metals and high concentration of sulfate. AMD creates several problems therefore, treatment technology for remediation AMD should be developed for elimination or reduction these impacts.) One of the most which is passive treatment technologies for treating AMD is Permeable Reactive Barriers (PRB). It has effectiveness to remove of various contaminants, and its low cost compared to other technologies. The purpose of this research was development an appropriate PRB system for treating acid mine drainage (AMD). The specific purpose was assessment the heavy metal contaminated in water and soil around the abandoned lignite coal mine, comparison heavy metal removal and sulfate reduction efficiency in continuous experiment for the combination of various electron donor by different ratio of organic material mixture. Summaries, contamination level at Ban Pu Mine, Lumphun province, Thailand, wastewater quality at mining site was exceeded Industrial Effluent Standard in Thailand in terms of pH and Mn. The pH value was 4.22 which exceed this standard (The standard is 5.5 to 9.0). The Manganese value was 17.36 mg/L (The standard is less than 5 mg/L). In addition, continuous experiment uses mixture of Pig farm WWTS (P), Rice husk (R) and Coconut husk chip (C) as electron donor by different ratio of organic material. The HRT value was 16 day and flow rate was 30 ml/hr. The best ratio of organic material as electron donor which appropriate for treating AMD in PRB system was ratio by dry weight 79:18:3 of P: R : C (Reactor 2). This ratio had the highest percent SO42- and Mn reduction at 64% and 98%, respectively. Fe, Cu and Zn removal rate in all reactors was approximately 98%, 99% and 92%, respectively. Element composition of the organic material selected as electron donor, N was decreased and Fe, Cu, Zn and Mn were increased. Coconut husk chip had the highest removal capacity of Fe, Cu, Zn and Mn, accounting for 10.59, 6.74, 2.15 and 5.74 mg removal per g dry weight of electron donor, respectively. Long Term Performance was approximately 230 day when % heavy metal removal assumed 80%. |