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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Energy, Materials and Product Design
Tri Rachmanto
University of Mataram
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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EFISIENSI WAKTU FERMENTASI DAN VARIASI BRIX TERHADAP HASIL AKHIR KADAR DAN VOLUME BIOETANOL PADA LIMBAH GULA (MOLASSES): EFFICIENCY OF FERMENTATION TIME AND BRIX VARIATION ON FINAL RESULTS AND VOLUME OF BIOETHANOL IN WASTE SUGAR (MOLASSES) Rizki Septiawan; Tri Rachmanto; Nurpatria
Energy, Materials and Product Design Vol. 3 No. 2 (2024): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram

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Abstract

ABSTRACT The use of fossil fuels in everyday life is increasing. Fossil fuels that come from elements of living things that have been buried for thousands or even millions of years are non-renewable or non-renewable, so the more use of fossil fuels the longer the time will run out. Therefore, bioethanol can act as a substitute or alternative energy to reduce the use of fossil fuels. Bioethanol is a liquid resulting from sugar fermentation from a carbohydrate source (cellulose) using microbes. The purpose of this study was to determine the efficiency of fermentation time on the final yield of bioethanol content and volume from bagasse (molasses) using various Brix values ​​of 14%, 15%, and 16% and the fermentation time used was 36 hours, 48 ​​hours, and 60 hours. From the variation of Brix value and fermentation time, 9 kinds of treatment were obtained with 3 repetitions so that the total sample was 27. The results of this study indicate that the fermentation time factor is the dominant factor in determining the volume of alcohol, and the Brix factor is the dominant factor in determining the concentration. The most optimal treatment to produce the highest volume of alcohol was the 14% Brix variation with a 36-hour fermentation time variation with an average bioethanol volume of 1145.3 mL, and the most optimal treatment to produce high alcohol content was 16% Brix variation with an average the moderate alcohol content is 84%.   Keywords: Bioethanol, Molasses, Brix, Time efficiency, Fuel
PENGARUH VARIASI TINGGI SUDU TURBIN DARI TINGGI BASIN TERHADAP DAYA DAN EFISIENSI TURBIN VORTEX Tri Rachmanto; Mirmanto; Randi Lelio
Energy, Materials and Product Design Vol. 3 No. 1 (2024): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram

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Electrical energy is a very important need for human life in various aspects, both on a large and small scale. One of the efforts to reduce the use of fossil fuels is to use natural resources that are not limited and can be renewed. Micro Hydro Power Plant (MHP) is an alternative source of electricity for the community, one of which is a vortex turbine. The vortex turbine is one type of micro hydro turbine that utilizes a whirlpool as a blade drive. This study examines the effect of blade height variations of 25%, 30%, and 35% of the basin height on power and efficiency. The results showed that the largest turbine power at 25% blade height variation from the basin height with a discharge of 0.009 m3/s was 3.294 Watt with an efficiency of 51.10%. The largest turbine power at an angle variation of 30% of the basin height with a discharge of 0.009 m3/s is 3.364 Watt with an efficiency of 50.66%. The largest turbine power at an angle variation of 35% of the basin height with a discharge of 0.009 m3/s is 4.062 Watt with an efficiency of 62.35%. Turbine power based on two-way anova analysis shows that between variations in turbine height and flow discharge have a significant effect on the turbine power produced and turbine efficiency based on two-way anova analysis shows that between variations in turbine height and flow discharge have a significant effect on the turbine efficiency produced.
PENGARUH VARIASI TEMPERATUR FERMENTASI TERHADAP KADAR DAN VOLUME ALKOHOL DALAM PEMBUATAN BIOETANOL DARI LIMBAH GULA (Molasse) MENGGUNAKAN MIKROAERASI: THE EFFECT OF FERMENTATION TEMPERATURE VARIATION ON ALCOHOL CONTENT AND VOLUME IN THE PRODUCTION OF BIOETHANOL FROM WASTE SUGAR (Molasses) USING MICROAERATION Tri Rachmanto; Luis Pratama Putra; Nur Kaliwantoro
Energy, Materials and Product Design Vol. 4 No. 1 (2025): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/empd.v4i1.2358

Abstract

Penyediaan pasokan energi pada masa depan merupakan suatu masalah yang selalu menjadi perhatian seluruh masyarakat dunia. Hal ini disebabkan karena sumber penghasil bahan bakar minyak (BBM) yaitu fosil semakin lama semakin berkurang. Salah satu upaya untuk mengurangi konsumsi masyarakat terhadap bahan bakar fosil adalah dengan memanfaatkan energi alternatif terbarukan yaitu bioetanol. Tujuan penelitian ini untuk mengetahui pengaruh dari variasi temperatur fermentasi terhadap kadar dan volume alkohol dari limbah gula (molases) dengan menggunakan mikroaerasi. Metode penelitian yang digunakan yaitu metode experiment. Variasi temperatur fermentasi yang digunakan yaitu 30oC, 32oC, 34oC, 36oC, 38oC. Proses fermentasi dilakukan selama 48 jam terhadap 30 Liter cairan molase. Namun sebelum itu, untuk memproduksi bioetanol dilakukan proses pengembangbiakan mikroorganisme selama 3 jam. Kemudian dilakukan proses destilasi untuk mendapatkan kadar dan volume alcohol dari proses fermentasi molases. Hasil penelitian menunjukkan bahwa faktor variasi tersebut berpengaruh terhadap kadar dan volume alkohol yang dihasilkan. Perlakuan yang paling optimal untuk menghasilkan kadar alkohol paling tinggi adalah temperatur 34oC dengan rata-rata kadar alkohol sebanyak 84% sedangkan perlakuan yang paling optimal untuk menhasilkan volume alkohol paling tinggi adalah temperatur 32oC dengan rata-rata volume alkohol sebanyak 668,7 mL.
ANALISA PENGARUH KAMPUH PENGELASAN DAN PERLAKUAN PANAS TERHADAP SIFAT MEKANIK SAMBUNGAN LAS BAJA SUP9 I Made Mara; Tri Rachmanto; Syamsul Hadi
Energy, Materials and Product Design Vol. 2 No. 2 (2023): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram

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Abstract

The development of science and technology which is growing rapidly greatly affects industries that produce machine elements that use steel as the main raw material, steel is widely used in construction. This has caused many mechanics to join steel using the SMAW process without regard to the welding method and mechanical properties which causes the steel not to be connected perfectly, thereby endangering safety. The purpose of this study was to see the effect of seam variation V, K and X and normalizing, quenching and no heat treatment on the mechanical properties of welded joints in SUP9 steel. From the variation of seam and heat treatment, there were 9 combinations with 3 repetitions. The results of this study indicate that the weld seam and heat treatment affect the tensile strength and impact price of SUP9 steel. The most optimal treatment to produce high tensile strength is seam variation X with quenching heat treatment with ASTM E8 specimen shape having an average tensile stress value of 84.23 Kgf/mm2, and for the most optimal treatment to produce high impact values ​​is variation of seam X with normalizing heat treatment with specimen form ASTM E23 has an average impact value of 1.11 J/mm2.
PENGARUH VARIASI pH DAN RAGI TERHADAP VOLUME DAN KADAR BIOETANOL DARI BAHAN MOLASE Nurchayati; Sugeng Kuswanto; Tri Rachmanto
Energy, Materials and Product Design Vol. 2 No. 2 (2023): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram

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Abstract

Energy is a necessity in carrying out economic activities in Indonesia, both for consumption needs and production activities in various business sectors. As a natural resource, energy must be used optimally for the benefit of society and its management must be based on the principles of sustainable development. Bioethanol is a renewable and environmentally friendly energy that can be used as an alternative to fossil fuels. The use of bioethanol as fuel has several advantages, namely the high oxygen content of bioethanol (35%) so that it can produce clean fuel. The purpose of this study was to determine the effect of variations in pH and yeast on the volume and content of bioethanol from molasses material using and the drying time used was 48 hours. From variations in pH and yeast, 9 types of treatment were obtained with 3 repetitions so that the total sample was 27. From the results of the study, the average volume of alcohol produced was at most 550.67 ml in the yeast mass treatment 10 gr/l with a pH of 4.5 and the least was in the yeast mass treatment 15 gr/l with a pH of 4.2 of 432 ml. Whereas the highest average yield was 91.67% for yeast mass of 10 gr/l with a pH of 4.2 and the lowest was found for yeast mass of 15 gr/l with a pH of 4.8 of 88.33%.
Adaptasi Agronomis Tiga Varietas Sorgum Manis (Sorghum bicolor L.) Terhadap Dua Agroekologi Lahan Kering di Pulau Lombok, Indonesia Fahrudin Fahrudin; Suwardji Suwardji; Lalu Sukardi; Sukartono Sukartono; I Gusti Lanang Parta Tanaya; Tri Rachmanto
Jurnal Penelitian Pendidikan IPA Vol 12 No 4 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i4.13202

Abstract

Lombok Island, Indonesia, possesses approximately 893,758 ha of dryland with significant potential for developing drought-tolerant crops such as sweet sorghum (Sorghum bicolor L.) to strengthen food security in semi-arid regions. This study evaluated the agronomic adaptation of three sweet sorghum varieties, namely Bioguma 3, Soper 9, and Numbu, under two contrasting dryland agroecosystems: clay-textured Vertisol in East Lombok (pH 6.8, organic C 2.2%, CEC 64.6 me/100 g) and sandy loam Entisol in North Lombok (pH 6.3, organic C 1.0%, CEC 15.9 me/100 g). The experiment employed a randomized complete block design with four replications, observing stem biomass, leaf biomass, and grain yield at 75, 90, and 105 DAS. Results demonstrated that soil physical and chemical properties strongly influenced varietal performance. The Vertisol soil, characterized by high cation exchange capacity and moisture retention, significantly enhanced vegetative growth, with Bioguma 3 producing the highest stem biomass (75.00 tons/ha) and leaf biomass (8.18 tons/ha). In contrast, the Entisol soil generated lower biomass yields (41.64 tons/ha stems and 5.55 tons/ha leaves) but supported more stable grain production across varieties. Soper 9 recorded the highest grain yield, reaching 6.09 tons/ha on Vertisol and 4.70 tons/ha on Entisol. These findings highlight the importance of integrating appropriate varietal selection with soil management strategies to improve dryland agricultural productivity and promote sustainable food security.
Co-Authors Fahrudin Fahrudin I Gusti Lanang Parta Tanaya I Made Mara Lalu Sukardi Luis Pratama Putra Mirmanto Nur Kaliwantoro Nurchayati Nurpatria Randi Lelio Rizki Septiawan Sugeng Kuswanto Sukartono Sukartono Suwardji Suwardji Syamsul Ph.D M.A. Hadi