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Zurohaina
Politeknik Negeri Sriwijaya
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The Utilization of Green Algae into Bioethanol Fuel with Hydrolysis Reaction of Sulfuric Acid Hilwatullisan; Ibnu Hajar; Zurohaina
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 1 (2022): IJRVOCAS - April
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v2i1.99

Abstract

The increase in population has increased the need for fuel oil and gas, our fossil energy reserve is increasingly decreasing, while its needs continue to increase. This fact opens up a chance to use renewable energy and reduce the use of fossil fuels. In addition to the depletion of the number of fossil fuels, other important reasons for reducing its use are environmental damage issues, ongoing prices, and greater subsidization burden. To overcome the situation, can be pursued in two ways. First reducing the level of consumption and both continue to develop other alternative energy sources, especially renewable energy sources. Lately emerged various findings. Ranging from cassava, sweet potatoes, to corn that is processed into bioethanol. But on its way, the development of the fuel is often burp. The clash with food needs is one of the challenges. While the crop fails and the land needed to be another problem that cannot be underestimated, especially amid the issue of global warming. BioEthanol itself is processed from carbohydrates or starch contained in natural materials. During this time bioethanol is produced by many food crops such as corn, cassava, and sweet potatoes. In fact, these materials are still needed as a support for foodstuffs. Through this study, the author lifted the green algae (Cladophora sp) as one of the alternative solutions in the production of bioethanol which can someday become an alternative fuel. This is because green algae (Cladophora sp) are scattered everywhere and the Carbohydrates content is quite high i.e. 52.54-60.98% (Khuantrairong et al., 2011). In this research researchers utilize the green algae to produce alternative fuels by looking at how the H2SO4 solvent concentration affects the resulting product.
Konsumsi Energi Pirolisator Kondensor Ganda Untuk Konversi Serbuk Kayu Jati Dan Meranti Menjadi Asap Cair Ida Febriana; Sahrul Effendy; Zurohaina; Venny Krysthin; Nova Fenoldi
Jurnal Redoks Vol. 8 No. 2 (2023): REDOKS JULI-DESEMBER
Publisher : Universitass PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/redoks.v8i2.9234

Abstract

Biomassa merupakan salah satu dari sekian banyak jenis sampah yang ramah lingkungan karena dapat didaur ulang menjadi barang yang bermanfaat jika dikelola dengan baik. Terdapat suatu metode yang cukup efektif untuk mengolah biomassa menjadi bernilai ekonomis yaitu dengan menggunakan metode pirolisis guna menghasilkan asap cair. Dilakukannya penelitian ini bertujuan untuk mengetahui jumlah konsumsi energi, total rendemen dan kualitas asap cair yang dihasilkan sesuai standar ASTM D7544. Proses pirolisis yang dilakukan ini memiliki variabel tetap berupa variabel bahan baku yaitu limbah serbuk kayu jati dan limbah serbuk kayu meranti dengan ukuran sampel yaitu 20-60 mesh sedangkan untuk variabel kendali, percobaan dilakukan dengan suhu 325⁰C. Dari hasil penelitian yang dilakukan, nilai konsumsi energi terendah diperoleh dari serbuk kayu meranti 60 mesh sebesar 9,08 kWh/l pada konsumsi daya 5,28 kWh dan total produk 0,581 liter, rendemen tertinggi sebesar 16% dari serbuk kayu jati 60 mesh, dan semua kondensat 1 asap cair dari masing-masing bahan baku sudah memenuhi standar fisik dari ASTM D7544 (densitas 1,1-1,3 gr/ml dan pH 2-3), serta standar kimia dari jurnal Maulina (2018) yaitu kadar asam 2,8-9,5% dan kadar fenol 0,2-2,9%.  
Ultrasonic-Assisted Alkaline Pretreatment for Enhanced Bioethanol Production from Water Hyacinth (Eichhornia crassipes) Biomass Alya Fazza; Rizky Dwi Ramadhon; Sahrul Effendy; Yohandri Bow; Zurohaina
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 6 No. 2 (2026): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v6i2.529

Abstract

Water hyacinth (Eichhornia crassipes) is an abundant lignocellulosic biomass with strong potential as a feedstock for bioethanol production, but its relatively high lignin content limits the accessibility of cellulose and inhibits the subsequent hydrolysis process. This study aims to analyze the effect of ultrasonic-assisted pretreatment duration and NaOH concentration on the lignocellulosic composition and the resulting bioethanol yield from water hyacinth biomass. Pretreatment was carried out at 60°C and 60 W power with time variations of 10, 15, 20, 25, and 30 minutes and NaOH concentrations of 1 M and 2 M. The pretreated samples were analyzed for lignin, cellulose, and hemicellulose content using the Chesson method, then hydrolyzed with 3% H2SO4, fermented for 120 hours using Saccharomyces cerevisiae, distilled, and characterized. The results showed that the optimum pretreatment condition was obtained at a treatment time of 25 minutes with 2 M NaOH, which reduced the lignin content from 12.1% to 5.4%, reduced the hemicellulose content to 10.8%, increased the cellulose content from 56.0% to 75.1%, and produced the highest glucose content of 8.2%. Under these optimum conditions, the resulting bioethanol had an ethanol content of 14%, a density of 0.980 g/mL, a pH of 6.5, and a distillate volume of 42 mL. Gas chromatography-mass spectrometry analysis further confirmed ethanol as the dominant compound in the distillate, supporting the validity of the refractometric measurement. Beyond 25 minutes of pretreatment, however, the lignin content, cellulose content, and bioethanol yield all showed a slight decline, indicating that excessively prolonged ultrasonic exposure can degrade part of the biomass structure and reduce process efficiency. Overall, these results indicate that ultrasonic pretreatment combined with 2 M NaOH effectively enhances delignification and improves the potential for bioethanol production from water hyacinth biomass, although further optimization is still required to achieve a fuel-grade ethanol content.
Co-Authors Alya Fazza Hilwatullisan Ibnu Hajar Ida Febriana Nova Fenoldi Rizky Dwi Ramadhon Sahrul Effendy Venny Krysthin Yohandri Bow