Simulation Modeling of the pH and TSS Quality of the Serongga River as a Result of Coal Mining Activities (Case Study PT. Baramega Citra Mulia Persada)

Abstract

PT. Baramega Citra Mulia Persada is a coal mining company that carries out exploitation activities in the Kelumpang Hilir District, Kotabaru Regency, South Kalimantan Province. Various land use activities in river water areas, such as coal mining activities, are thought to have affected river water quality. Based on the description above, it is necessary to analyze the quality and status of river water around coal mining activities in an effort to control water pollution. River water sampling can describe river water quality more accurately but requires a long time and high costs. So, river modeling is carried out with the aim of minimizing observation costs and time. The appropriate modeling to simplify river water quality conditions is the Qual2kw model. Based on this description, the aim of this research is to determine the pH and TSS concentrations at each sampling point in the Serongga River and to create a pH and TSS model from wastewater. PT BCMP which flows into the Serongga River. This research will be carried out at PT. Baramega Citra Mulia Persada is located in Kelumpang Hilir District, Kotabaru Regency, South Kalimantan Province. This research activity began with field observations by taking samples at three points, namely the upstream of the Serongga River, outfall, and downstream of the Serongga River at 4 (four) different time periods. The samples that were taken were then tested for pH and TSS at the Tanah Bumbu Regency Environmental Laboratory. Based on the results of laboratory analysis of pH and TSS, it shows that the concentration at the point source is in accordance with Governor Regulation No. 36 of 2008 concerning Waste Water Quality Standards, and at the upstream, outfall and downstream monitoring points of the Serongga River, the pH and TSS values are in accordance with Government Regulation No. 22 In 2021 in the Class II River Water Quality Standards section. The modeling results show that when the pH and TSS values at the point source range from 7.03-7.13 and the TSS ranges from 101-150 mg L-1, the pH and TSS values at the upstream, outfall and downstream monitoring points of the Serongga River are still in accordance with PP No. 22 of 2021. Simulation of the pH (6-9) and TSS (101-200 mg L-1) model scenario at pointsource shows that the pH and TSS values at the upstream, outfall and downstream monitoring points of the Serongga River are still within the quality standards in accordance with PP No.22 of 2021 in the Class II River Water Quality Standards section. Keywords: Simulation Modeling, pH, TSS, Qual2kw