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Journal of Clean Technology
Published by Universitas Negeri Semarang
ISSN : 24608874     EISSN : 24609811     DOI : -
Core Subject : Engineering,
Engineering
The Journal of Clean Technology (JoCT) is a leading peer-reviewed publication dedicated to advancing research and innovation in the field of clean technology. JoCT provides a platform for scientists, engineers, policymakers, and industry professionals to disseminate cutting-edge research, exchange ideas, and promote sustainable solutions to global environmental challenges. JoCT has a printed and online standard serial number which is p-ISSN 2460-8874 (printed version) and e-ISSN 2460-9811 (electronic version).
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 1 No. 1 (2024): February 2024" : 5 Documents clear
Bioethanol Production from Rice Straw through Utilization of Agrobiomass Waste in Central Java Towards Clean Energy: a Review Nabil, Nisrina Hasna’; Handoko, Pratama Senapati Bagus; Destantri, Fitri Wahyuningtyas; Syahputra, Adhika Bintang; Bahlawan, Zuhriyan Ash Shiddieqy
Journal of Clean Technology Vol. 1 No. 1 (2024): February 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i1.1656

Abstract

Bioethanol is an alternative energy to replace fossil fuels from plants. Central Java is the second largest rice producer in the world in Indonesia, with the potential of rice straw waste which can be optimized into bioethanol. Rice straw contains abundant cellulose reaching 32-47%, hemicellulose reaching 19-27%, and lignin reaching 5-24%. Methods for making bioethanol from rice straw include pretreatment, hydrolysis, fermentation, and distillation. Lignin inhibits acid penetration before hydrolysis and microbial growth during fermentation, so it needs to be eliminated using alkaline pretreatment. Glucose production from alkali-pretreated rice straw can be hydrolyzed using chemical or enzymatic catalysts. Acid hydrolysis method using dilute H2SO4 with consideration of a shorter operating time. In addition, the price of enzymes is very high, and the operating time is very long, which will reduce product effectiveness. The acid hydrolysis method using 2% H2SO4 takes 30 minutes at 150 oC, which can produce a yield of 16%. Production of bioethanol from rice straw using separate hydrolysis and fermentation (SHF) methods. Saccharomyces cerevisiae, with a 24-hour fermentation time, produced a yield of 80.9% and a productivity of 0.172 g/L h. Distillation is used to remove impurities from liquids that have been polluted with rice straw-derived solutes with various boiling points. Vacuum distillation can produce a yield of 40% purity. Utilization of rice straw into bioethanol can reduce environmental pollution so that it supports clean energy.
Utilization of Rice Straw Waste as a Source of Bioenergy: A Review Prawira, Aditya Hadi; Anugrah, Rizzky; Bahri, Saepul; Firmansyah, Fariq Hammam; Roland, Hizkia Edd
Journal of Clean Technology Vol. 1 No. 1 (2024): February 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i1.1657

Abstract

The rice straw waste is a byproduct of rice processing and is a plentiful natural resource in Indonesia. It has been utilized as a renewable energy source to decrease reliance on fossil fuels and tackle worldwide energy concerns. Rice straw waste contains various organic compounds, such as 36.6% cellulose, 25.3% hemicellulose, and 14.3% lignin. These compounds can be converted into various types of bioenergy, such as bioethanol, biogas, biomass, and bioelectricity through fermentation and pyrolysis processes. Rice straw waste has significant potential as a raw material in bioethanol production, biogas and bio-oil. rice straw waste also has the potential to produce bio-oil through the pyrolysis process. Tiny organisms, like bacteria and fungi, have a crucial part in the creation of bioethanol, biogas, and bio-oil. These microscopic organisms will be used in the process of fermentation, decomposition, or other biochemical reactions to convert rice straw waste into the desired renewable energy source. In the production of bioethanol, the use of enzymes such as amylase or cellulase may be required to break down the raw materials into simpler components that can be converted through the fermentation process into bioethanol. The process of producing biogas involves utilizing an anaerobic digester, which is a controlled environment devoid of oxygen. In this environment, microorganisms decompose the organic material found in rice straw waste and generate biogas. The methods used in the production of bioenergy (bioethanol, biogas and bio-oil) from straw waste may vary depending on the context and available technology.
Sustainable Production of Biofuels from Microalgae (Chlorella vulgaris) Using Irradiation Microwave as Future Green Energy; a Review Krisdayanti, Shendy; Fauziyyah, Hasna Amalia; Ubay, Isnina Noor; Erliana, Savira Rinda
Journal of Clean Technology Vol. 1 No. 1 (2024): February 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i1.1663

Abstract

Biodiesel is a solution to the problem of depleting fossil fuel sources in Indonesia. Biodiesel can be derived from vegetable and animal fats. On the other hand, microalgae cultivation areas are spread across 26 provinces in Indonesia with a production potential of 462,400 tonnes/year. Microalgae with lipid content ranging from 38% - 60% can be converted into crude biodiesel as much as 35%. Irradiation microwave is the simplest and most effective technology with a constructive method for extracting oil from animal and vegetable fats, and biomass, and can be scaled easily. Using irradiation microwave, oil will be extracted from microalgae using hexane: methanol solvent for 60 minutes with a microwave power of 600 watts. Microalgae extraction with the help of irradiation microwave can produce more lipids compared to conventional lipid extraction which is 31% and 26% higher. Microalgae that go through a treatment process using irradiation microwave is more efficient because the average cost is two-thirds less compared to conventional heating, its lower energy consumption, lower costs, a more effective heating process, can increase production, and have a big impact on increasing biofuel yields.
Bioethanol Production from Sago Waste as Renewable Energy: A Review Salwa, Nadiatus; Gunawan, Cahyani Eka Putri; Danisa, Fani; Nilnalmuna, Revitalia; Rohmah, Nur
Journal of Clean Technology Vol. 1 No. 1 (2024): February 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i1.1666

Abstract

Energy consumption has increased rapidly because the world population has grown, so has energy consumption for industrial needs. Now Indonesia still uses fossil fuels as the main energy source, because of their non-renewable nature, the continuous use of fossil fuels causes scarcity problems. Bioethanol production is currently getting more intense, this is because there are several factors that cause it to be more intense, namely market stability, low costs, sustainability, the composition of alternative energy fuels and the catastrophic depletion of fossil fuels. Sago waste can be used as an environmentally friendly renewable resource. Bioethanol production process from sago waste using enzymes and fermentation with the help of microorganisms. The bioethanol production process from sago waste has four main parts. The first thing to do is the pre-treatment process, namely drying the sago pulp and delignification process. Samples from the delignification process will then be used in the hydrolysis process with a catalyst in the form of HCl. The results of the hydrolysis were fermented at a pH of 5 and tape yeast was added. Then in the distillation process requires filtrate which was then evaluated qualitatively using K2Cr2O7 reagent. The mixture derived from the fermentation process using baker's yeast and wet sago pulp can produce bioethanol levels up to 45.70%. The process of making bioethanol from sago waste through a baker's yeast fermentation process is expected to help advance the bioethanol production process as a renewable energy source in Indonesia.
Utilization of Palm Solid Residue For Bioethanol Production In Sumatra Indonesia – A Review Enjelita, Anggun; Auralita, Kakalia Putri; Aprianti, Resah; Indrajaya, Zahra Afifa; Maulana, Ivan
Journal of Clean Technology Vol. 1 No. 1 (2024): February 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/joct.v1i1.1669

Abstract

The combustion of fossil fuels causes an increase in the release a group of gases found in the earth atmosphere that trap heat and contribute to the greenhouse effect, which in turn contributes to the occurrence of global warming. The advancement of sustainable energy sources plays an important role in human life due to renewable and environmentally friendly. This problem can be resolved by using alternative fuels as renewable sources of energy that are more environmentally friendly, such as bioethanol. Empty fruit bunches (EFB) constitute a portion of the solid waste that cause problems in storage, transportation, and processing costs. This is because EFB is waste in a solid that is produced from a processing facility where the fruits of the oil palm tree are processed to extract palm oil in large quantities. The process of producing bioethanol by utilizing coconut fruit bunches that are devoid of their contents as a raw material involves two essential stages: hydrolysis and drying. Hydrolysis with an acid catalyst results in a lower yield, but the catalyst itself is inexpensive. Conversely, when using enzyme catalysts, hydrolysis produces a greater quantity of reducing sugars. Enzyme catalysts can be employed in the simultaneous saccharification and fermentation (SSF) process using S. cerevisiae yeast, while chemical catalysts can be used in separate hydrolysis and fermentation (SHF) methods. The SSF method provides a comparatively elevated ethanol yield, demands less enzyme usage, has a shorter duration for ethanol production, and is environmentally friendlier when compared to the SHF procedure.

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