Esthi Kusdarini
Institut Teknologi Adhi Tama Surabaya
Yuliano Eldianto Atawolo
Institut Teknologi Adhi Tama Surabaya
Fairus Atika Redanto Putri
Institut Teknologi Adhi Tama Surabaya
DOI:
Keywords: Acid mine drainage, quicklime, neutralization, linear regression
ABSTRACT
Acid mine drainage has the potential to pollute water bodies. One method of acid mine drainage treatment is neutralization using quicklime. This study aims to plan the dose of quicklime and estimate the cost of neutralizing acid mine drainage using a linear regression equation. Acid mine drainage samples were obtained from PT Bukit Asam. Neutralization experiments were carried out on a laboratory scale using variable doses of quicklime: 0.0759, 0.0971, 0.1460, 0.2965, and 0.3877 g/L. The results showed that the acid mine drainage samples contained parameters of pH 3.6, TSS 87 mg/L, Fe 1.1239 mg/L, and Mn 3.8333 mg/L. Neutralization of acid mine drainage using quicklime at a dose of 0.1460-0.2965 g/L was able to increase pH by 33-153% and decrease TSS by 2-94%, Fe by 24-87%, and Mn by 14-43%. The linear regression equation obtained is y = 13.707x + 4.103, where x is the dose of quicklime (g/L) and y is pH. Calculations using the linear regression equation produce a dose requirement of quicklime of 0.1383–0.3572 g/L to produce acid mine water with a pH of 6-9. Meanwhile, processing acid mine water with a discharge of 86,400 m3/day requires quicklime of 11,949-30,862.08 kg/day and costs of Rp10,156,650.00–26,232,700.00/day.
