Media Ilmiah Teknik Lingkungan (MITL) Volume 6, Nomor 1, Hal. 01–10 DOI: https://doi.org/10.33084/mitl.v6i1.1398 Pengaruh Volume Tampung Kolam Settling pond Terhadap Pengelolaan Air Limbah Pertambangan Batubara di PT. XXX, Kalimantan Timur Muhamad Wahyudin 1* , Lambang Subagiyo 2 , Saibun Sitorus 3 1 Program Studi Magister Ilmu Lingkungan Pascasarjana Universitas Mulawarman, Samarinda, Indonesia 2 Program Studi FKIP Universitas Mulawarman, Samarinda, Indonesia 3 Program Studi Kimia FMIPA Universitas Mulawarman, Samarinda, Indonesia *surel: wahyu_blh11@yahoo.co.id ABSTRACT Coal mining with open pit system has a wastewater problem that must be managed. Wastewater management must pay attention to design dimentions of the settling pond, where the dimentions of the settling pond are influenced by runoff discharge from open areas due to mining activities. Wastewater problems from coal mining activities at PT. XXX, East Kalimantan is the concentration of waste water parameters that do not meet the required quality standards and there is a potential for discharge of wastewater that cannot be accomodated in the settling pond. The research method used is descriptive quantitative method. Based on the analysis, some parameters such as pH that not fulfill the quality standart at the outlet settling pond TJL Utara-01 which is 4,93 and TJL Selatan which is 4,96 where the threshold value of the quality standart is 6-9. Parameters must be monitored for activities coal mining based on Perda Kaltim 02 of 2011 is pH, TSS, Fe and Mn. Value volume of retention pond, where the TJL Utara-01 is 2,79 m 3 /hour, TJL Utara-02 is 95,63 m 3 /hour and TJL Selatan is 23,58 m 3 /hour. Settling ponds TJL Utara-01 and TJL Selatan at PT. XXX, is not effective in collecting wastewater because some concentrations of wastewater parameters that do not meet quality standards. The greater the volume of the pond, the wastewater quality will meet the quality standard, due to physical treatment. Keywords: Settling pond, influence, wastewater, coal mining, volume of retention pond Submitted: May 2020 Reviewed: January 2021 Published: February 2021 INTISARI Pertambangan batubara dengan sistem tambang terbuka memiliki dampak salah satunya adalah air limbah. Pengelolaan air limbah harus memperhatikan rancangan dimensi settling pond yang dipengaruhi debit limpasan dari areal terbuka akibat aktivitas penambangan. Permasalahan air limbah dari kegiatan pertambangan batubara di PT. XXX, Kalimantan Timur adalah konsentrasi parameter air limbah yang tidak memenuhi baku mutu dan ada potensi debit air limbah yang tidak mampu tertampung pada settling pond. Metode penelitian yang digunakan adalah metode deskriptif kuantitatif. Berdasarkan hasil analisis data masih terdapat parameter pH yang belum memenuhi baku mutu pada outlet settling pond TJL Utara-01 yaitu 4,93 dan TJL Selatan yaitu 4,96 dimana nilai ambang batas baku mutu pH adalah 6 – 9. Kata Kunci: Settling pond pengaruh, air limbah, pertambangan batubara, volume tampung kolam