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All Journal PILAR Jurnal Sains dan Ilmu Terapan
Yuniar Yuniar
Politeknik Negeri Sriwijaya
Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Environmental Science Transportation

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STABILISASI TANAH LEMPUNG DENGAN BAHAN KIMIA ASAM FOSFAT SEBAGAI LAPISAN FONDASI JALAN Ibrahim Ibrahim; Arfan Hasan; Yuniar Yuniar
PILAR Vol. 8 No. 1 (2013): PILAR 08032012
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Land is a part of the most structure as a foundation  that supporting the construction above it. The quality and durability of a construction can’t be separated from the nature of soil, some of them may cause problems.  These problems usually occurred because of the unstable soil condition. The settlement that have done so far is to fix the top layer of the road but it doesn’t solve the problem cause unstable road not only the structure on the road but also on the subgrade. The repair on the soft subgrade  cause water content can be done with stabilization. This research is analyze about behavior of clays  from Soekarno-Hatta Palembang which obtained  the density soil maximum and water content optimum with acid phosphate increment as 0% , 2.5% ,  5% , 7.5% , 10% and 12.5% of the land, and then do testing of index properties soil and California Bearing Ratio (CBR) test. From the research according to Unifed Soil Classification System (USCS) these soil at this area is included in the OH category, while according to American Association of State Highway an Transportation Officials (AASHTO) these soil is included in the A-7-5 category. The mixture soil with increment acid phosphate than original soil are showed that the liquid limid (LL) and plastic limid (PL) has decreased, it’s mean index plastic (IP) tended to decrease. CBR value with increament of additive tend to increase and attain a peak increase from 7.5% while 10% and 12.5 % decrease.
Pengolahan Limbah Palm Oil Mill Effluent (POME) Menggunakan Katalis ZnO dengan Penambahan CU untuk Meningkatkan Kinerja Fotokatalitik Ferdika Nanda Maulana; Selastia Yuliati; Yuniar Yuniar
Jurnal Sains dan Ilmu Terapan Vol. 8 No. 2 (2025): Jurnal Sains dan Ilmu Terapan
Publisher : Politeknik Kampar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59061/jsit.v8i2.1193

Abstract

Over time, the yield of oil palm had continued to increase each year, which was followed by a rise in the amount of waste produced. One of the main wastes from palm oil processing was liquid waste, commonly known as Palm Oil Mill Effluent (POME). This study aimed to obtain a ZnO/Cu catalyst and to determine the optimal catalyst weight and irradiation time to reduce COD, TSS, and pH values. The ZnO/Cu catalyst was synthesized using the co-precipitation method and was applied through a photocatalytic process, which utilized catalysts and ultraviolet (UV) light. The catalyst was applied to POME with ZnO weight variations of 100 mg, 150 mg, and 200 mg, and UV irradiation times of 30, 60, 90, 120, and 150 minutes. The best result was obtained at a catalyst weight of 200 mg and an irradiation time of 150 minutes, resulting in COD of 216 mg/L, TSS of 20.00 mg/L, and pH of 7.39, which met the wastewater quality standards.
Co-Authors Arfan Hasan Ferdika Nanda Maulana Ibrahim Ibrahim Selastia Yuliati