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All Journal International Journal of Renewable Energy Development Jurnal technoscientia Jurnal Pengendalian Pencemaran Lingkungan (JPPL) JURNAL TEKNOLOGI TECHNOSCIENTIA Journal of Community Development Journal of Renewable Energy, Electrical, and Computer Engineering Journal of Engineering Science and Technology International Journal of Renewable Energy Development Jurnal Teknologi Sumberdaya Mineral
Zeni Ulma
Politeknik Negeri Jember
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Nursing Public Health Social Sciences

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Online Fun Physics Experiments Untuk Meningkatkan Motivasi Belajar Siswa Sekolah Dasar Yayasan Mutiara Bunda Jember Risse Entikaria Rachmanita; Zeni Ulma
Journal of Community Development Vol. 3 No. 1 (2022): August
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/comdev.v3i1.67

Abstract

Distance Learning which is currently being implemented as a result of the Covid-19 pandemic which has lasted for almost 1.5 years has caused psychological problems for students. The problems that arise include boredom due to monotonous learning, less interactive, and piling tasks. The level of education that is quite affected due to the implementation of Distance Learning is elementary school education. To overcome these problems, it is necessary to do a learning that is able to restore student motivation in learning. Mutiara Bunda Jember Foundation in collaboration with Renewable Energy Engineering lecturers at the Politeknik Negeri Jember held an interesting and interactive lesson entitled "Fun Physics Experiment". This activity was attended by 30 participants from various grade levels at the elementary school level. The results of the pretest and posttest questionnaires showed that there was an increase in participants' knowledge of light refraction, air pressure, combustion and pressure processes, heat transfer and density. In addition, after the "Fun Physics Experiment" activity, it was found that the level of interest of participants in Physics lessons increased, there were 7 participants who were very interested in Physics lessons and 23 participants were interested in Physics lessons.
Pengaruh Penambahan Serat Kulit Kopi dan Polivinil Alkohol (PVA) terhadap Karakteristik Biodegradable Foam dari Pati Kulit Singkong Febrina Sarlinda; Amrul Hasan; Zeni Ulma
Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Vol. 4 No. 2 (2022): JPPL, September 2022
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/jppl.v4i2.1430

Abstract

Polystyrene plastic or styrofoam is very popular to be used as a food packaging container even though Styrofoam has a bad impact on health. In addition, Styrofoam also cannot be biodegraded naturally in the environment so the use of syrofoam is also a problem for the environment. One alternative to styrofoam is biodegradable foam (biofoam) made from starch and cellulose. It is safe for health and can be broken down naturally. Cassava peel is rich in starch (carbohydrates) but has low cellulose content. Meanwhile, coffee peel is rich in cellulose and minimal in carbohydrates. Both types of waste have the potential to become biodegradable foam raw materials. The addition of synthetic polyvinyl alcohol (PVA) polymer is expected to improve the mechanical quality of biodegradable foam. This study aims to obtain the best formulation for the manufacture of biodegradable foam from cassava starch with the addition of coffee peel cellulose and PVA. The quality of biofoam evaluated includes tensile strength, water absorption, and biodegradability. The best biofoam characteristics were obtained at the addition of 15% fiber and 15% PVA, resulted in water absorption of 28.87%, the tensile, strength of 2.70 N / mm2, and biodegradability of 93.66% for 30 days.
Utilization of Cassava Peel (Manihot utilissima) Waste as an Adhesive in the Manufacture of Coconut Shell (Cocos nucifera) Charcoal Briquettes Bayu Rudiyanto; Intan Rida Agustina; Zeni Ulma; Dafit Ari Prasetyo; Miftah Hijriawan; Bambang Piluharto; Totok Prasetyo
International Journal of Renewable Energy Development Vol 12, No 2 (2023): March 2023
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2023.48432

Abstract

Coconut shells and waste cassava peels could be used as the main raw material for biomass briquettes for alternative energy sources in Indonesia. This study aims to analyze the quality of briquettes based on a coconut shell and cassava peel adhesive through proximate analysis with three treatment ratio variations. The ratio of coconut shell to cassava peel used varied from V1 (75%:25%), V2 (70%:30%), and V3 (65%:35%). Based on the result, the charcoal briquettes produced have a density of 0.61 gram/cm³-0.66 gram/cm³, water content of 5.51%-7.85%, ash content of 1.50%-2.86%, combustion rate of 0.021 gram/s-0.026 gram/s, and the calorific value of 6,161 cal/gram-6,266 cal/gram. However, all the treatment variations appropriate the SNI 01-6235-2000, the national standard of Indonesia for the quality of charcoal briquette, which includes the calorific value (>5,000 cal/gram), moisture content (<8%), and ash content (<8%). Briquettes with the best quality were generated by V1 with a density of 0.66 gram/cm³, water content of 5.51%, ash content of 1.50%, combustion rate of 0.026 gram/s, and calorific value of 6,266 cal/gram. Furthermore, briquette material from the coconut shell waste with natural cassava peel adhesive can be feasible as an alternative fuel.
Peningkatan Kualitas Briket Ampas Kopi Menggunakan Perekat Kulit Jeruk Melalui Metode Torefaksi Terbaik Qanitah Qanitah; Yurdika Dwi Fatholah Akbar; Zeni Ulma; Yuli Hananto
Journal of Engineering Science and Technology Vol. 1 No. 1 (2023): January
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v1i1.3

Abstract

Energy is generally divided into two, the first is non-renewable energy for example oil, coal, and natural gas while the second is renewable energy such as water power, solar power, wind power, and biomass. Briquettes is one of the developments of biomass as an alternative fuel. The purpose of this study was to make and analyze the characteristics of coffee grounds briquettes using an adhesive from orange peel with torrefaction method. Torrefaction is a low temperature (200-300 oC) carbonization process without oxygen. Briquettes are made by percentage of coffee grounds and orange peel adhesive 70% : 30%, 60% : 40%, and 50% : 50%. Torrefaction process with a temperature of 200 oC within 60 minutes without any air or little air in the furnace with the addition of modified elbows. The results showed that the best composition was found in DK1 with a ratio of 70% coffee grounds with 30% orange peel adhesive, which has density 0.49 gr/cm3, water content 5.11%, volatile matter content 78.33%, bound carbon content 17.31%, 0.62% ash content, and 4656 cal/gr calorific value
Penerapan Teknologi Pompa Irigasi Pertanian Bertenaga Surya di Desa Dukuhdempok Kecamatan Wuluhan Kabupaten Jember Yuli Hananto; Zeni Ulma; Alex Taufiqurrohman Zain; Michael Joko Wibowo; Risse Entikaria Rachmanita
Journal of Community Development Vol. 4 No. 1 (2023): August
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/comdev.v4i1.126

Abstract

The conversion of agricultural land is an issue that needs attention because of the community's dependence on the agricultural sector and a serious threat to national food security with permanent impacts. Difficulty in irrigating agricultural land is one of the triggering factors for increasing land conversion, then a technology is needed to overcome this problem. The purpose of the implementation of this community service is to make irrigation system support equipment by utilizing renewable energy, namely solar panels. Solar panels are used as an energy source to drive the pump. To find out the effectiveness of the manufacture of solar-powered irrigation pumps, a performance test of the tool is carried out, namely testing of energy gain and water discharge. The solar-powered irrigation pump with a capacity of 800 Wp can operate properly which results in an average energy gain of 940.4 Wh with an average discharge gain of 1.84 liters/second.
Utilization of Cassava Peel (Manihot utilissima) Waste as an Adhesive in the Manufacture of Coconut Shell (Cocos nucifera) Charcoal Briquettes Bayu Rudiyanto; Intan Rida Agustina; Zeni Ulma; Dafit Ari Prasetyo; Miftah Hijriawan; Bambang Piluharto; Totok Prasetyo
International Journal of Renewable Energy Development Vol 12, No 2 (2023): March 2023
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2023.48432

Abstract

Coconut shells and waste cassava peels could be used as the main raw material for biomass briquettes for alternative energy sources in Indonesia. This study aims to analyze the quality of briquettes based on a coconut shell and cassava peel adhesive through proximate analysis with three treatment ratio variations. The ratio of coconut shell to cassava peel used varied from V1 (75%:25%), V2 (70%:30%), and V3 (65%:35%). Based on the result, the charcoal briquettes produced have a density of 0.61 gram/cm³-0.66 gram/cm³, water content of 5.51%-7.85%, ash content of 1.50%-2.86%, combustion rate of 0.021 gram/s-0.026 gram/s, and the calorific value of 6,161 cal/gram-6,266 cal/gram. However, all the treatment variations appropriate the SNI 01-6235-2000, the national standard of Indonesia for the quality of charcoal briquette, which includes the calorific value (>5,000 cal/gram), moisture content (<8%), and ash content (<8%). Briquettes with the best quality were generated by V1 with a density of 0.66 gram/cm³, water content of 5.51%, ash content of 1.50%, combustion rate of 0.026 gram/s, and calorific value of 6,266 cal/gram. Furthermore, briquette material from the coconut shell waste with natural cassava peel adhesive can be feasible as an alternative fuel.
Analisis Fisis Briket Berbahan Baku Sludge Biogas dengan Perekat Daun Randu (Ceiba Pentandra) Nur Faizin; Hegy Eka Anugrah; Zeni Ulma
Jurnal Teknologi Sumberdaya Mineral Vol. 3 No. 2 (2022)
Publisher : Program Studi Teknik Pertambangan Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jeneral.v3i2.34350

Abstract

Limbah sludge biogas dari kotoran sapi berpotensi untuk dibuat briket. Kotoran sapi dapat digunakan sebagai bahan baku briket karena memiliki kandungan kimiawi cukup baik. Kandungan kimiawi kotoran sapi antara lain 22,59% selulosa, 18,32% hemiselulosa, 10,20% lignin, 34,72% total karbon organik, serta 1,26% total nitrogen. Penelitian ini bertujuan untuk mengetahui komposisi terbaik dan karakteristik briket perekat daun randu terhadap kualitas briket sludge biogas. Data pada penelitian ini diperoleh dari 6 pengujian yaitu uji kadar air, kadar abu, densitas, densitas kamba, laju pembakaran, dan nilai kalor. Variasi sampel yang digunakan adalah rasio antara bahan baku dengan bahan perekat. Rasio sampel yang digunakan pada penelitian ini yaitu (75% : 25%), (70% : 30%), dan (65% : 35%). Metode pengarangan yang digunakan yang digunakan adalah pirolisis, proses ini berlangsung selama 2-3 jam menggunakan suhu 200-300°C. Hasil terbaik diperoleh untuk variasi V1 yaitu kadar air 6,7638% (SNI<8), kadar abu 1,0199% (SNI<8), densitas 1,1627 gr/cm3(SNI>0,44), densitas kamba 0,3563 gr/cm3, serta laju pembakaran 0,0887 gr/s. Sedangkan nilai kalor yang diperoleh sebesar 2667 kal/gr. Nilai kalor ini masih belum memenuhi standar SNI yaitu >5 Kkal/gr sehingga membutuhkan penelitian lebih lanjut.
Pelatihan Penggunaan Mesin Pengering Kopi Untuk Meningkatkan Keterampilan Petani Kopi Nur Faizin; Zeni Ulma; Dafit Ari Prasetyo; Yuli Hananto; Cahyaning Nur Karimah
Journal of Community Development Vol. 4 No. 2 (2023): December
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/comdev.v4i2.159

Abstract

Improving human resource skills is one of the pillars in determining the increase in quality and quantity of production in a business. In the coffee plantation business sector, the skills of coffee farmers play an important role in the production process. The operation of the machines used is an absolute requirement for achieving effectiveness and efficiency in the process. One of them is a coffee drying machine obtained by the Sumber Kembang farmer group from previous community service activities. This must be accompanied by operating skills so that in this service activity training will be carried out on the use of coffee drying machines. The methods used were surveys, training and discussions. The result of this service activity is the achievement of increasing the skills of coffee farmers in terms of operating coffee drying machines. Achievement of service activities is carried out by providing feedback to partners in the form of questionnaires. The results of the questionnaire showed that respondents from partner members mostly gave positive responses to service activities in the form of coffee drying machine training.
Optimasi Variasi Nutrisi NPK dengan Proses Hidrolisa Asam terhadap Peningkatan Nilai Brix dan Kadar Bioetanol dari Limbah Kulit Pisang Kepok : Optimasi Variasi Nutrisi NPK dengan Proses Hidrolisa Asam terhadap Peningkatan Nilai Brix dan Kadar Bioetanol dari Limbah Kulit Pisang Kepok zeni ulma; Mukasi Wahyu Kurniawati
Jurnal Teknologi Technoscientia Vol. 18 No. 1: Jurnal Teknologi Technoscientia (September 2025)
Publisher : Direktorat Penelitian & Pengabdian Kepada Masyarakat (LPPM), Universitas AKPRIND Indonesia Yogyakarta

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

Abstract

Efforts to reduce dependence on fossil fuels have encouraged the utilization of bioethanol, particularly second-generation bioethanol derived from lignocellulosic biomass. This type of biomass contains cellulose, hemicellulose, and lignin, with Kepok banana peel serving as one of its promising raw materials. The pretreatment stage was carried out through chemical delignification by soaking banana-peel flour in a 10% NaOH solution (1:6 b/v) for 12 hours. Subsequently, the lignocellulosic characteristics were analyzed using the Chesson–Datta method. This alkaline treatment effectively reduced lignin content by 36.6%, decreased hemicellulose by 11.1%, and increased cellulose up to 62.8%. The next process involved hydrolysis using 2 M HCl, which produced a hydrolysate with a sugar concentration of 13.5°. Fermentation was conducted for three days using baker’s yeast (1.4%), urea (1%), and varying concentrations of NPK (0.6%, 0.8%, and 1.0%) with a substrate volume of 150 mL, followed by distillation until no further droplets were produced. The 0.8% NPK concentration yielded the most optimal fermentation performance, producing 6.5% bioethanol, 17 mL of product volume, and a 17% yield. These findings confirm that nutrient supplementation plays a crucial role in enhancing microbial activity during fermentation, while the increase in cellulose after delignification further supports the success of the hydrolysis stage. The combination of appropriate pretreatment, hydrolysis, and nutrient provision demonstrates that Kepok banana peel has strong potential as a sustainable feedstock for second-generation bioethanol production.
Optimization of Waste Cooking Oil Biodiesel Processing Using Rice Field Snail Shell Nanocatalyst and Coffee Bean Husk Adsorbent (Coffea Canephora L.) Dafit Ari Prasetyo; Aprilia Anre Ongan; Dimas Rizky Hidayatullah; Reza Azim Abdala; Umi Sholikah; Intan Dwi Wahyu Setyo Rini; Haning Hasbiyati; Zeni Ulma
Journal of Renewable Energy, Electrical, and Computer Engineering Vol. 6 No. 2 (2026): September 2026
Publisher : Institute for Research and Community Service (LPPM), Universitas Malikussaleh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jreece.v6i2.29808

Abstract

Indonesia's B40 mandate has intensified the search for low-cost biodiesel feedstocks. Waste cooking oil (WCO) is limited by a high free fatty acid (FFA) content and by catalyst and purification costs. This study integrates two agricultural wastes into one route: robusta coffee bean husk (Coffea canephora L.) activated carbon serves as both a de-acidification adsorbent and a dry-washing agent, while calcined rice field snail shell (Pila ampullacea) supplies a CaO nanocatalyst for microwave-assisted transesterification (MAT). Each stage was optimised by response surface methodology with a Box–Behnken design. Adsorption with 6 % (m/v) adsorbent for 175 min at 40 mesh lowered the FFA content from 2.2 % to 0.8 % (63.86 % removal); particle size was the only significant single factor (p = 0.0015; R² = 0.9575). MAT with 3 % (m/v) CaO nanocatalyst (98.79 % purity), 11 min and 220 W gave a crude yield of 97 %; microwave power (p = 0.0056) and its interaction with time (p = 0.0179) were significant. Dry washing at 78.9 mesh, 2.18 % (m/v) and 59.2 °C gave a purified yield of 75.33 %. Dry washing cut the water content from 2.69 % to 0.012 % and the acid value from 0.995 to 0.531 mg-KOH g⁻¹, so the fuel met SNI 7182:2015 for density (867.5 kg m⁻³), water, sediment and iodine value; the acid value stayed marginally high and the methyl ester content, 66.69 % (m/m) by GC–MS, below the 96.5 % minimum, showing that conversion rather than purification limits the route.
Co-Authors Alex Taufiqurrohman Zain Amrul Hasan Aprilia Anre Ongan Bambang Piluharto Bayu Rudiyanto Cahyaning Nur Karimah Dafit Ari Prasetyo Dafit Ari Prasetyo Dimas Rizky Hidayatullah Febrina Sarlinda Haning Hasbiyati Hegy Eka Anugrah Intan Dwi Wahyu Setyo Rini Intan Rida Agustina Michael Joko Wibowo Miftah Hijriawan Mukasi Wahyu Kurniawati Nur Faizin Qanitah Qanitah Reza Azim Abdala Risse Entikaria Rachmanita Totok Prasetyo Umi Sholikah Yuli Hananto Yurdika Dwi Fatholah Akbar