Kajian Limbah Cair Air Asam Tambang Galena dan Pemenuhan Standar Baku Mutu Air PT. Berkat Bhinneka Perkasa Kecamatan Pangkalan Koto Baru, Kabupaten Limapuluh Kota, Provinsi Sumatera Barat

Abstract

This study aims to analyze the waste produced by Galena (PbS) Acid Mine Drainage (AMD) activities and to examine the neutralization of AMD using Quicklime (CaO). Oil Palm Empty Fruit Bunch Biochar (TKKS), Calcium Carbonate Lime (CaCO3), and Rice Husk Biochar (SP). Additionally, the study evaluates the effects of AMD treatment with three different treatments on-site to ensure compliance with the wastewater quality standards for mining activities based on the Ministry of Environment Decree No. 113 of 2003. The research employed both Survey and Experimental methods. The survey method involved field observations to identify observation points and collect field data, while the experimental method included laboratory analysis and subsequent data analysis. The results indicate that treatment with lime and biochar increases the pH level in line with dosage increases. The pH rose from a control level of 4.74 to 11.75 with Quicklime (CaO), to 7.87 with Calcium Carbonate Lime (CaCO3), to 7.58 with TKKS biochar, and to 6.28 with Rice Husk Biochar (SP). Lime application raised the pH of AMD from a control of 4.74 to 11.78, while biochar application raised it from 4.74 to 7.78. The rise in pH following ameliorant treatment is attributed to the alkalinity of lime and biochar. The concentration of active iron (ferro) in AMD, initially at 240.20 ppm, increased to 349.17 ppm with Quicklime (CaO), to 685.18 ppm with Calcium Carbonate Lime (CaCO3), to 548.96 ppm with TKKS biochar, and to 285.60 ppm with Rice Husk Biochar (SP).