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All Journal Jurnal Teknik Kimia dan Lingkungan Jurnal Polimesin Jurnal Solusi Masyarakat Dikara Journal of Engineering and Technological Sciences
Riskina, Shafira
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Characterization of Bioethanol from Tuber of Porang Waste Fermented with Saccharomyces cerevisiae Enzyme: Effect of Fermentation Time and Yeast Ratio Ridara, Rina; Muhammad, Muhammad; Setiawan, Adi; Riskina, Shafira; Nurjannah, Siti
Jurnal Teknik Kimia dan Lingkungan Vol. 7 No. 2 (2023): October 2023
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v7i2.3199

Abstract

The production of bioethanol from non-plant lignocellulosic materials has reached a commercial scale and is advocated as a possible solution for the decarbonization of the transport sector. Porang pulp tubers can be converted into bioethanol because they have abundant potential due to their high glucomannan content. The purpose of this study was to determine the effect of fermentation time and the ratio of yeast addition on bioethanol production. The methods used are hydrolysis, fermentation and distillation methods. The hydrolysis process used 5% (v/v) HCl catalyst, the fermentation process with 6 gr sample powder tuber of waste used Saccharomyces cerevisiae bacteria with varying ratios of 2.5, 4 and 6.5 g and variations in fermentation time for 2, 4 and 6 days at 38-40˚C. The results showed that the duration of fermentation had a significant effect on the yield of bioethanol, where microorganisms have the opportunity to break down more glucose to produce bioethanol. While the ratio of the addition of yeast added to the fermentation process, the greater the ratio of the addition of yeast, the greater the bioethanol produced. Where the addition of 6.5 grams of yeast and 6 days of fermentation time, resulted in a yield of 9.889%, a bioethanol concentration of 37.599%, a refractive index of 1.3642 and a density of 1.04 g/ml.
Pemanfaatan Limbah Sekam Padi Menjadi Bioarang untuk Pembenah Tanah Lahan Pertanian di Desa Pande Kecamatan Tanah Pasir Aceh Utara Setiawan, Adi; Ginting, Zainuddin; Setiawaty, Sri; Riskina, Shafira; Nurjannah, Siti
Jurnal Solusi Masyarakat Dikara Vol 1, No 1 (2021): DESEMBER 2021
Publisher : Yayasan Lembaga Riset dan Inovasi Dikara

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Abstract

Desa Pande merupakan sentra industri tradisional pandai besi, yang didominasi oleh sektor pertanian dan peternakan. Pada saat pasca panen padi,  selalu ada sejumlah limbah atau residu yang tersisa seperti sekam dan jerami padi. Limbah ini biasanya dibuang atau dibakar begitu saja ditempat sehingga mengakibatkan masalah yang serius dalam pencemaran udara. Sesungguhnya tumpukan sekam dan jerami padi yang melimpah dan tersebar luas di Desa Pande adalah salah satu sumber utama biomassa dari limbah pertanian yang berpotensi untuk dijadikan bioarang. Kegiatan pengabdian kepada masyarakat (PkM) ini bertujuan untuk memberikan solusi melalui pengolahan sekam padi menjadi bioarang. Produk bioarang dari limbah biomassa ini selanjutnya dapat diaplikasikan pada lahan pertanian sebagai soil amandement (memperbaiki kondisi biofisik tanah) sekaligus bermanfaat untuk carbon sequestration (mempertahankan konsentrasi gas CO2 di atmosfir agar tetap atau menurun) sehingga dapat menahan laju pemanasan global. Untuk mecapai target tersebut, maka Tim Pengabdian tidak hanya melakukan proses pelatihan pembuatan bioarang saja tetapi juga merancang dan mempabrikasi reaktor yang mudah dibuat dioperasikan oleh masyarakat. Metode pendekatan yang ditawarkan untuk menyelesaikan persoalan mitra adalah dalam bentuk pelatihan, pembinaan dan penendampingan pembuatan bioarang. Tahapan kegiatan ini diawali dengan survey ketersediaan bahan baku dan perlengkapan, merancang dan mempabrikasi alat, mengujicoba alat, memberikan penyuluhan/ bimbingan teknis terhadap mitra serta melakukan evaluasi secara menyeluruh terhadap pelaksanaan PkM dan hasil yang dicapai. Teknologi konversi limbah biomassa yang dipilih untuk PkM ini adalah teknologi kiln batch reactor. Hasil evaluasi dari kegiatan ini adalah meningkatnya kesadaran masyarakat desa Pande untuk memanfaatkan limbah sekam padi dan biomassa lainnya untuk menjadi bioarang. Selain itu, masyarakat juga berhasil disadarkan akan pentingnya penggunaan bioarang untuk pembenah tanah.
Properties of Hydrochar Derived from Arabica Coffee Agro-Industry Residues under Wet Torrefaction Method Shalihah, Nyakty; Setiawan, Adi; Muhammad, Muhammad; Riskina, Shafira
Journal of Engineering and Technological Sciences Vol. 56 No. 6 (2024)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2024.56.6.2

Abstract

This study utilized coffee cherry residues, which is an abundantly available source of biomass in Indonesia. One of the methods to utilize coffee plantation residues effectively is wet torrefaction. This method is well-known as a hydrothermal method, where the biomass conversion process uses liquid as a medium and reactant in the process. The objective of this work was to develop an effective procedure for converting coffee agro-waste into marketable products using hydrothermal technology. The information related to changes in physical and thermal properties were explored in this work. To achieve the research objectives, three main steps were performed, i.e., feedstock preparation, wet torrefaction, and hydrochar characterization. Two types of feedstocks were studied in this work, coffee parchment and coffee pulp. In the wet torrefaction process, each feedstock was treated using two types of solutions, i.e., distilled water and acetic acid, at different concentrations. The reaction was carried out in an autoclave with a pressure of 2 bar (g) and an operating temperature of 130 ℃ for 2 hours. The properties of the hydrochar products were then analyzed using various methods, including bomb calorimetry, SEM, density, TGA-DTG, and hydrophobicity analyses. Overall, the results indicated that the hydrochar produced under acetic acid solution had better characteristics compared to that treated under distilled water. In terms of fixed carbon content and calorific value, the values increased up to 25.3% and 4,603 kcal/kg, respectively. Enhanced hydrophobicity was only observed in the coffee parchment hydrochar, where the average time required to adsorb water was 146.6 s, which can be categorized as strongly hydrophobic.
Physical and Thermal Properties of MgCl2 mixed with NaCl at Various Ratios for Solar Thermal Energy Storage Application Gunawati, Gunawati; Setiawan, Adi; Syahputri, Riana; Riskina, Shafira
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6150

Abstract

Latent heat storage is a system capable of absorbing and releasing heat energy when a material undergoes a phase change. The material often used in this system is referred to as PCM (Phase Change Material). One of commonly used material for heat storage is salt. This type of material was chosen due to its low-cost and better in chemical-physical properties. This study aimed to find out the effect of combining NaCl with MgCl2 on the properties and performance of PCM. For preparation, MgCl2 was added to NaCl followed by manual mixing and grinding to ensure homogeneity. The samples were placed inside the muffle furnace and heated to 600°C. Next, the samples were evaluated for physical properties such as density, specific heat, and thermal conductivity, and tested for charging and discharging performance using a thermal box. The test results suggested that the higher MgCl2 content, the more specific heat capacity and thermal conductivity. However, it is inversely proportional to the density, where the lower the MgCl2 portion, the higher the density value. This caused the rate of thermal energy absorption and energy storage capacity increased significantly
Effect of briquetting pressure on combustion properties of hydrothermally treated king grass biomass Alchalil, Alchalil; Setiawan, Adi; Dirga, Muhammad; Riskina, Shafira; Nurjannah, Siti; Hasibuan, Rizqon; Rahman, Abdul
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7300

Abstract

The utilization of biomass as an alternative energy source continues to gain attention, particularly in the form of solid briquettes with properties comparable to coal. In Indonesia, the co-firing program in coal-fired power plants (PLTU) promotes the use of biomass briquettes as supplementary fuel. King grass (Pennisetum purpureum), a fast-growing, non-food crop that thrives on marginal land, is a promising candidate. However, its low energy density limits practical application. This study aims to enhance the fuel quality of king grass through hydrothermal treatment and evaluate the effect of varying briquetting pressures on briquette properties. Briquettes were produced without pressure and with compaction pressures of 100, 200, 300, 400, and 500 kg/cm². Results show that higher briquetting pressure reduced moisture content from 3.99% to 2.98% and friability from 54.46% to 11.95%. While ash content and volatile matter were minimally affected, fixed carbon increased to 28.42%, and calorific value peaked at 3,923 kcal/kg. Hydrothermal treatment further improved calorific value, reduced ash content, and enhanced fixed carbon levels. These findings demonstrate that the combination of hydrothermal treatment and briquetting pressure significantly improves king grass briquette quality, supporting their potential as a sustainable co-firing fuel in coal-fired power plants.
Co-Authors Abdul Rahman Adi Setiawan Alchalil Alchalil Dirga, Muhammad GUNAWATI, GUNAWATI Muhammad Muhammad Ridara, Rina Rizqon Hasibuan Setiawaty, Sri Shalihah, Nyakty Siti Nurjannah Syahputri, Riana Zainuddin Ginting