TECHNICAL AND ENVIRONMENTAL STUDY OF TAL BARAT’S SETTLING POND PT. BUKIT ASAM (PERSERO) TBK TANJUNG ENIM MINING UNIT SUMATERA SELATAN

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Abstract

TAL Barat’s runoff comes from TAL Barat and MT4’s sump. Area of MT4’s sump will be done mining extention cause there’s coal reserves so it needs sump drying. It’ve an impact on settling pond. So it needs to conduct technical and environmental study to overcome problems, where data taken, processed, and analysed in location with survey method and laboratory test. Result’re the difference characteristics of both sump which will be flowed towards the one settling pond. It’ll give technical effects increasing runoff to settling pond that would exceed current capacity and environment effects, there’s a change in pH, TSS, Fe and Mn. Plan debit and pump time of TAL Barat’s sump’re 480 m3/h and 5 h/day and MT4’s sump’re 972 m3/h and 21 h/day. Plan’s runoff to settling pond is 38.514 m3/day. Plan compartment’re 7 compartement. Plan of sedimentation time to be 2-3 times higher than actual. Related environment’s aspect, water quality test of TAL Barat’s inlet(1) and MT4’s inlet(2)’re average pH1=4.9133, pH2=3,8333, TSS1=398,3333 mg/L, TSS2=202,6667 mg/l, Fe1=4,6355 mg/l, Fe2=5,0191 mg/l, Mn1=7,8172 mg/l, Mn2=7,9234 mg/l. Outlet’re average pH=5,8283, TSS=119 mg/l, Fe=4,6815 mg/l, Mn=7,5966 mg/l. It’ll be concluded pH and Mn haven’t fulfilled quality standard. Active treatment’s performed to increase pH=5,83 to 6 by adding dose of lime 53,08 kg. Passive treatment’s performed to reduce metal by plant 6.348 Kiambang,86.017 Akar Wangi,20.933 Eceng Gondok dan 21.504 Lembang.