Stabilization/Solidification of Tailing on Traditional Gold Mining in Kulon Progo Using Fly Ash
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Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
Ranno Marlany Rachman   

Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo,Surabaya 60111, Indonesia
Publication date: 2018-05-01
J. Ecol. Eng. 2018; 19(3):178–184
Traditional gold mining activity is one of the sources of mercury contamination. Total mercury concentration in tailing ponds in Kulon Progo ranged from 164.49 mg/kg to 383.21 mg/kg, which exceeded the quality standard values set by the government of Indonesia No. 101 of 2014, which is 75 mg/kg. One method that can be applied is stabilization/solidification (S/S). This study aims to determine the optimum composition of the tailing mixture with fly ash in S/S process. The variations of fly ash composition with tailing are 100:0, 90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80 and 10:90. The results of the study found that the optimum composition of fly ash: tailings was 10:90, with compression test of 74 ton/m2 and TCLP test was 0.0069 mg/L. The obtained compression test results were in accordance with US EPA Standard quality of 35 ton/m2. TCLP test results meet the standard of Indonesian Government Regulation no. 101 of 2014, amounting to 0.05 mg/L.