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All Journal Jurnal Simetris REKAYASA Machine : Jurnal Teknik Mesin Quantum Teknika Journal of Industial Engineering and Technology Prosiding Seminar Nasional Program Pengabdian Masyarakat
Yusuf, Mirza
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Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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Pengolahan Intrusi Air Laut Menggunakan Sistem Hybrid Multistage Reverse Osmosis: Analisis Tds, Turbiditas, Dan Korelasi Kinerja Proses Yusuf, Mirza; Hakim, Iqbal Lukman; Hermawan, Andi; Mohammad Syaiful Anwar
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.31755

Abstract

Clean-water demand in coastal settlements has increased dependence on groundwater and may intensify water-quality deterioration caused by seawater influence, surface runoff, and local hydrogeological conditions. This study evaluates dug-well water quality in the South Depok Coastal area using Total Dissolved Solids (TDS) and turbidity, and examines the relevance of a hybrid multistage reverse osmosis (RO) system for raw-water treatment. Water samples were purposively collected from 10 community wells in January and May 2025. The mean TDS increased from 84.15 mg/L to 171.70 mg/L, while mean turbidity increased from 1.48 NTU to 5.81 NTU. The Pearson correlation between TDS and turbidity was positive, with r=0.74 in January, r=0.60 in May, and r=0.67 for the combined dataset. These results show that higher dissolved-solid concentrations tend to coincide with higher turbidity, although the relationship is affected by well-specific conditions, rainfall, suspended matter, and local hydrogeology. Although all TDS values remained below 500 mg/L, five May samples exceeded the 5 NTU turbidity threshold. A multistage treatment train consisting of sedimentation, multimedia filtration, cartridge filtration, pH-antiscalant conditioning, RO membrane separation, remineralization, and disinfection is therefore recommended to reduce particulate loading and stabilize treated-water quality. Future studies should report stage-by-stage permeate and concentrate data to validate membrane performance quantitatively.
Analisis SFC Campuran Biodiesel B35 Beraditif Imagina pada Mesin PLTD Luwuk Eksperimental Kinerja Energi Anwar, Mohammad Syaiful; Ahmadi, Nur; Yusuf, Mirza
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.31550

Abstract

The use of B35 biodiesel in diesel engines often faces constraints related to performance and component durability, necessitating additives to improve fuel performance. Imagina® Dex Ultimate is an essential oil-based additive claimed to improve stability, cetane number, and lubrication properties, and to reduce deposits and corrosion. This study aims to analyze the characteristics of specific fuel consumption (SFC) in the use of B35 with the addition of Imagina additives in the Luwuk Diesel Power Plant (PLTD). The research method involved field testing on a diesel engine with a 1:1000 liters mixture ratio, mixing ±2 hours before testing, and operating the engine at three load levels (900, 700, and 500 kW). The test was carried out by comparing fuel without and with additives. The results showed that the addition of additives did not significantly reduce SFC across all load variations. At a load of 900 kW, energy production was relatively stable, with an increase of 0.07 kWh, while SFC increased by 0.0013 liters/kWh compared to the case without additives. Analysis of the fuel's physical properties shows that the density and flash point still meet B35 standards, while the FAME content is slightly above 35%. The calorific value did not increase significantly, and it even decreased by 0.18 MJ/kg in the Mitsubishi engine and by 0.06 MJ/kg in the Deutz engine. Based on these results, the use of the Imagina additive in B35 at the Luwuk Diesel Power Plant has not demonstrated technical feasibility in improving fuel consumption efficiency.
Co-Authors Ade Irvan Tauvana andi hermawan Anwar, Mohammad Syaiful Dhewanto, Santo Ajie Ferriawan Yudhanto, Ferriawan Hadi, Bima Soma Hakim, Iqbal Lukman Hanafi, M. Nur Syifa Sukmawan Herfani, Desta Amalia Holyness Nurdin Singadimedja Khairunnisa, Salwa Aghnia Laras, Arya Pandiko Lukman Nulhakim Mohammad Syaiful Anwar Mokhamad Is Subekti Nulhakim, Lukman Nur Ahmadi, Nur Pamungkas, Elzandro Ragil Pangestu, Dwi Adi Prambandono, Bayu Purbajati, Dimas Pulung Putri Rachmawati, Putri Rachmanu, Fatkur Rachmawati, Fitri Lili Saputri, Auli Suciatno, Suciatno Syafrizal Syafrizal Widodo Widodo Wisnujati, Andika