Claim Missing Document
Check
Articles

Found 33 Documents
Search

APLIKASI LIMBAH KERTAS UNTUK PEMBUATAN BATAKO Ranno Marlany Rachman
Jurnal Teknologi Kimia Unimal Vol. 13 No. 1 (2024): Jurnal Teknologi Kimia Unimal - Mei 2024
Publisher : Chemical Engineering Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jtku.v13i1.19560

Abstract

Aktivitas sehari-hari yang terjadi di lingkungan Fakultas Teknik Universitas Halu Oleo tidak terlepas dari sampah kertas, khususnya sampah kertas HVS. Penelitian ini bertujuan untuk mengetahui komposisi optimum batako dengan penambahan limbah kertas dan mengetahui kualitas produk batako dengan penambahan limbah kertas. Metode penelitian ini menggunakan metode eksperimen dengan perbandingan PC : PS = 1 : 6 yang kemudian diubah menjadi perbandingan volume. Variasi penambahan limbah kertas adalah 5%, 15%, dan 25% dari volume pasir yang dibutuhkan. Penelitian ini mengacu pada SNI 03-0349-1989. Hasil uji kuat tekan pada umur 28 hari, nilai uji kuat tekan tertinggi pada variasi 5% dengan kuat tekan sebesar 56,67 Kg/cm2. Nilai kuat tekan terendah terjadi pada variasi 25% dan kuat tekan sebesar 33,60 Kg/cm2. Sedangkan kuat tekan batako normal yang ada di pasaran lebih rendah dibandingkan dengan kuat tekan batako yang diberi tambahan kertas. Kuat tekan batako normal 1 = 41,31 Kg/cm2, batako normal 2 = 16,67 Kg/cm2, dan batako normal 3 = 2,85 Kg/cm2. Hal ini menunjukkan bahwa variasi batako dengan penambahan limbah kertas 5%, 15% dan 25% lebih unggul dibandingkan batako normal yang ada di pasaran yang mampu memenuhi standar mutu SNI batako yaitu mutu kelas III dan IV.
Investigation of the spread of mercury in the land around the waste storage ponds in the Kulon Progo traditional gold mine Rachman, Ranno Marlany; Ngii, Edward; Sya’ban, Abdul Rahim
Journal of Degraded and Mining Lands Management Vol. 8 No. 4 (2021)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2021.084.2911

Abstract

This study was conducted to determine mercury contamination contained in soils in Kalirejo sub-district, Kulon Progo, Indonesia. This contamination occurred as a result of traditional gold mining activities that used the amalgamation method of mercury. Soil samples were collected from 6 sites; one site was located in an uncontaminated location, and 5 sites in contaminated soil were taken from 10 meters distance from the tailing ponds. Samples were collected from each site at 30, 60, and 90 cm depths. Mercury concentrations in each sample were measured according to the US EPA method, using Mercury analyzer type VM-3000. Mercury concentrations in uncontaminated area at 30, 60, 90 depths were 0.19 mg/kg, 0.02 mg/kg, and <0.0001 mg/kg respectively. These values did not exceed the quality standard according to Government Regulation No 101 The Year 2014 concerning Hazardous Waste Management of 0.3 mg/kg. Meanwhile, mercury concentrations around the tailing ponds were 0.30 to 22.51 mg/kg, which exceeded the quality standard.
Solidification and stabilization of mercury-contaminated tailings in artisanal and small-scale gold mining using tras soil Rachman, Ranno Marlany; Mangidi, Uniadi; Trihadiningrum, Yulinah
Journal of Degraded and Mining Lands Management Vol. 10 No. 4 (2023)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2023.104.4575

Abstract

Artisanal and small-scale gold is known to be sources of mercury pollution. This mercury contamination occurs when gold is isolated by the amalgamation method, contamination occurs. Mercury pollution in small-scale artisanal gold mining in the Kulon Progo area of Yogyakarta, the lowest tailing content was 164.49 mg kg-1, and the highest was 383.21 mg kg-1. This value exceeded the quality standard stipulated by Indonesian Government Regulation 22 of 2021 of 75 mg kg-1. The technology that can control pollution is stabilization/solidification (S/S). This research aimed to determine the optimum composition of the tailings mixture with tras soil. Variations in the design of tras soil with tailings were 100:0, 90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80, and 10:90. The results showed that the optimum tras: tailings soil composition was 90:10, with a compressive test of 31 t m-2. Toxicity Characteristic Leaching Procedure (TCLP) was 0.0033 mg L-1 according to the quality standard of Indonesian Government Regulation no. 22, 2021, with a value of 0.05 mg L-1. The compressive strength results follow the quality of the US EPA of 35 t m-2.