Skripsi
EVALUASI HASIL FITOREMEDIASI LOGAM BESI (Fe) DAN MANGAN (Mn) MENGGUNAKAN TANAMAN AKUMULATOR DI KPL AL 01 PT BUKIT ASAM TANJUNG ENIM
Coal mining activities have had both positive and negative impacts on the surrounding environment. Acid mine drainage (AMD) is a negative impact of the mining process. Acid mine drainage contains heavy metals Fe and Mn which can disrupt aquatic ecosystems. The AMD treatment is carried out by PT Bukit Asam through a Sludge Settling Pond (KPL). The treatment of AMD is divided into two methods, namely active treatment and passive treatment. KPL Air Laya (AL) 01 is one of the KPLs that processes AMD using the phytoremediation method using accumulator plants which takes place in a passive treatment pond. The focus of this study was to evaluate the results of phytoremediation at KPL AL 01 on AMD samples, sediment, and accumulator plants in three sampling periods. AAT and sediment samples were taken at four points including the inlet, active treatment, passive treatment, and outlet ponds. Accumulator plant samples in the form of vetiver, kiambang, and water jasmine were taken in the passive treatment pond. Parameters measured in AAT include pH, TSS, and Fe and Mn metal concentrations while sediment and hyperaccumulator plants were measured for Fe and Mn metal concentrations. The results of the study on the first, second, and third samplings showed pH values ranging from 4.11 to 9.25 while TSS values were 4-105 mg/L. The concentration of Fe metal in AAT was 0.09 - 4.98 mg/L and Mn metal was 0.30-1.55 mg/L. The concentration of Fe metal in sediment was 104.51-280.73 mg/L and Mn was 2.86-77.85 mg/kg. The accumulation of Fe heavy metal in the stems and leaves of vetiver, kiambang and water jasmine is lower with concentrations ranging from 0.89-7.10 ppm compared to the roots with concentrations ranging from 18.53-87.04 ppm. The accumulation of Mn heavy metal in the stems and leaves of vetiver, kiambang and water jasmine is also lower with concentrations ranging from 1.63-25.08 ppm ppm compared to the roots with concentrations ranging from 5.82-61.77 ppm. The BCF value for Fe metal in vetiver, kiambang, and water jasmine plants showed an average BCF value of 0.19 and was categorized as an excluder. The BCF value for Mn metal in vetiver and kiambang plants showed an average BCF value of 3.07 and was categorized as an accumulator, but water jasmine was categorized as an excluder. The TF value for Fe and Mn metals in vetiver, kiambang, and water jasmine plants showed an average TF value of 0.27 indicating a phytostabilization mechanism. Kiambang and vetiver plants are effective plants in reducing the concentration of Fe and Mn metals. Hyperaccumulator plants play an important role in supporting the success of AAT processing through their ability to accumulate heavy metals, although monitoring results show a fluctuating tendency due to uncontrollable environmental conditions, such as rainfall, temperature, and metal availability. Keywords : Acid mine drainage, Phytoremediation, Accumulator Plants