Proses Fermentasi pada Produksi Bioetanol Dedak Padi dengan Hidrolisis Enzimatis

METANA ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 81-87
Author(s):  
Miftakhu Falaah ◽  
Heny Kusumayanti
Keyword(s):  
Rice Bran ◽  
Fossil Fuels ◽  
Fermentation Process ◽  
Fossil Fuel ◽  
Negative Impact ◽  
Energy Sources ◽  
Important Process ◽  
Fuel Prices ◽  
Rice Milling ◽  
Influential Variable

Meningkatnya harga bahan bakar dan menurunnya cadangan bahan bakar fosil memaksa untuk mencari sumber-sumber energi yang murah sebagai biofuel, seperti bioetanol dapat mengurangi efek negatif dari penggunaan bahan bakar fosil yang tidak terbarukan. Bioetanol dapat terbuat dari biomassa yang mengandung gula, pati dan selulosa. Dedak padi merupakan hasil samping dari penggilingan padi dan menyumbang ±11% dari berat padi. Dalam hal ini dedak padi karbohidrat yang cukup tinggi untuk diolah menjadi bioetanol. Sementara untuk meningkatkan kadar etanol, proses terpenting dalam produksi bioetanol adalah proses fermentasi. Tujuan dari penelitian ini yaitu pengoptimalan proses fermentasi meliputi pH dan waktu pada pembuatan bioetanol dari ekstrak dedak padi dengan penambahan urea dan NPK sebagai sumber nutrisi untuk pertumbuhan saccharomycess cerevisiae. Penelitian ini menggunakan dedak padi yang dihidrolisis, kemudian difermentasi menggunakan saccharomycess cerevisiae dengan penambahan nutrisi urea dan NPK, dan di distilasi untuk dimurnikan. Pengoptimalan pH dan waktu pada proses fermentasi serta penambahan nutrisi urea dan NPK diharapkan mampu meningkatkan kadar bioetanol yang dihasilkan. Hasil data dihitung dengan menggunakan metode perhitungan faktorial desain untuk mengetahui variabel paling berpengaruh.  Rising fuel prices and declining fossil fuel reserves force to find cheap energy sources as biofuels, such as bioethanol can reduce the negative impact of using non-renewable fossil fuels. Bioethanol can be produced from biomass containing sugar, starch and cellulose. Rice bran is a by product of rice milling and accounts for ±11% of the weight of rice. In this case the carbohydrate rice bran is high enough so that it can be processed into bioethanol. Meanwhile, to increase ethanol content the most important process in manufacture of bioethanol is fermentation process. The purpose of this study is to optimize the fermentation process including pH and time in manufacture of bioethanol from rice bran extract with addition of urea and NPK as a source of nutrients for growth saccharomycess cerevisiae. This study used rice bran which was hydrolyzed, then fermented using saccharomycess cerevisiae with addition of urea and NPK nutrients, and then distilled to be purified. Optimizing pH and time in the fermentation process as well as adding urea and NPK nutrients are expected to increase levels of bioethanol produced. The results of the data are calculated using the design factorial calculation method to determine the most influential variable.

scholarly journals Impact of Crystallography on Design of Cathode Materials for Li-ion Batteries

2014 ◽  
Vol 70 (a1) ◽  
pp. C20-C20
Author(s):  
Evgeny Antipov ◽  
Nellie Khasanova
Keyword(s):  
Transition Metal ◽  
Cathode Materials ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Li Ion Batteries ◽  
Practical Applications ◽  
Storage Devices ◽  
Li Ion

Ninety percent of the energy produced today come from fossil fuels, making dramatically negative impact on our future due to rapid consumption of these energy sources, ecological damage and climate change. This justifies development of the renewable energy sources and concurrently efficient large storage devices capable to replace fossil fuels. Li-ion batteries have originally been developed for portable electronic devices, but nowadays new application niches are envisaged in electric vehicles and stationary energy storages. However, to satisfy the needs of these rapidly growing applications, Li-ion batteries require further significant improvement of their properties: capacity and power, cyclability, safety and cost. Cathode is the key part of the Li-ion batteries largely determining their performance. Severe requirements are imposed on a cathode material, which should provide fast reversible intercalation of Li-ions at redox potential close to the upper boundary of electrolyte stability window, possess relatively low molecular weight and exhibit small volume variation upon changing Li-concentration. First generation of the cathode materials for the Li-ion batteries based on the spinel (LiM2O4, M – transition metal) or rock-salt derivatives (LiMO2) has already been widely commercialised. However, the potential to further improve the performance of these materials is almost exhausted. The compounds, containing lithium and transition metal cations together with different polyanions (XmOn)p- (X=B, P, S, Si), are now considered as the most promising cathode materials for the next generation of the Li-ion batteries. Covalently-bonded structural frameworks in these compounds offer long-term structural stability, which is essential for good cyclability and safety. Further advantages are expected from combining different anions (such as (XO4)p- and F- ) in the anion sublattice, with the hope to enhance the specific energy and power of these materials. Various fluoride-phosphates and fluoride-sulphates have been recently discovered, and some of them exhibit attractive electrochemical performance. An overview of the research on the cathode materials for the Li-ion batteries will be presented with special emphasis on crystallography as a guide towards improved properties important for practical applications.

Global Potential of Biomass: Heat, Electricity and Liquid and Gaseous Fuels Markets

2006 ◽  
Author(s):  
Jude Iyinbor ◽  
Ogunrinde Abayomi
Keyword(s):  
Environmental Effects ◽  
Alternative Energy ◽  
Fossil Fuels ◽  
Fossil Fuel ◽  
Energy Utilization ◽  
Energy Sources ◽  
Gaseous Fuels ◽  
Alternative Energy Sources ◽  
Oil Sector ◽  
Market Factors

Negative environmental effects, diminishing fossil fuel sources and soaring oil prices are some of the pertinent factors militating against the long term usage of fossil fuels. These make the introduction of alternative energy sources an integral part of our global energy plan. On the contrary, established fossil fuel infrastructures, flexibility of fossil fuels and economic gains from the oil sector are a few reasons why there is a global attitude of ‘drill the last drop before developing sustainable alternatives’. There are various energy sources that have little environmental effects and are sustainable (e.g. wind, geothermal, solar, hydro, biomass, e.t.c.), but the potentials they do have when it comes to the major energy utilization forms (heat, electricity and liquid and gaseous fuels) will be a key determinant of how alternative energy sources will be able to match the seemingly invincible presence of fossil fuels. The biomass option is examined in this report considering its potential with respect to heat, electricity and liquid and gaseous fuels market. Factors that may favour or hinder its potential and suitable solutions on how the potential can be increased are also discussed.

scholarly journals Catalysts for Biodiesel Production: A Review

2021 ◽  
Vol 33 (9) ◽  
pp. 1985-1999
Author(s):  
K.A.V. Miyuranga ◽  
D. Thilakarathne ◽  
Udara S.P.R. Arachchige ◽  
R.A. Jayasinghe ◽  
N.A. Weerasekara
Keyword(s):  
Energy Demand ◽  
Fossil Fuels ◽  
Reaction Rate ◽  
Fossil Fuel ◽  
Sustainable Energy ◽  
Biodiesel Production ◽  
Energy Sources ◽  
World Population ◽  
Economic Issues ◽  
The World

As the world population and modernization increase, energy demand increases. One of the non-sustainable energy sources is fossil fuels. However, fossil fuel consumption raises various environmental and economic issues. Most of the studies focus on sustainable energy sources, which can replace fossil fuel dependence. Biodiesel is an alternative sustainable fuel for diesel power. Biodiesel can produce through the transesterification process. Since the catalyst plays a significant role in the biodiesel yield during a defined reaction time, the addition of a catalyst can increases the reaction rate. This article is outlined the several catalysts used by multiple researchers over the years to increase biodiesel yields.

scholarly journals Life Cycle Assessment of Ethiopian Cement Manufacturing: A Potential Improvement on the Use of Fossil Fuel in Mugher Cement Factory

2021 ◽  
pp. 100-112
Author(s):  
Lemma Beressa ◽  
Battula Vijaya Saradhi
Keyword(s):  
Life Cycle ◽  
Portland Cement ◽  
Impact Assessment ◽  
Life Cycle Impact Assessment ◽  
Fossil Fuels ◽  
Energy Use ◽  
Fossil Fuel ◽  
Ghg Emissions ◽  
Energy Sources ◽  
Cement Production

The use of imported fuel in the Ethiopian cement industry increased the cost of production and the environmental burden, necessitating intervention. The greenhouse gas (GHG) emission, energy usage intensity, and resource exploitation of Ethiopian cement production were evaluated using the life cycle impact assessment (LCA) tool, aiming to recommend improvements. The LCA study used cumulative energy demand (CED) and Intergovernmental Panel on Climate Change (IPCC) 2006 life cycle impact assessment (LCIA) methods. For the case study of Mugher cement factory (MCF), the results on energy use intensities showed 3.74, 3.67, and 2.64 GJ/ton of clinker, Ordinary Portland cement (OPC), Pozzolana Portland cement (PPC), respectively. The result revealed MCF's energy use intensity was within the global range of 3.32 to 5.11 GJ/ton of cement production using similar kiln technology. The results on the GHG emissions were 0.87, 0.84, and 0.59 tons of CO2-equivalent/ton of clinker, OPC, and PPC, respectively. Process emissions accounted for 60% of overall CO2 emissions, with energy-related emissions accounting for the remaining 40%. CO2 emissions of MCF are below the global limit of 0.9 tons/ton of clinker, where all energy sources are fossil fuels. However, it is higher than the 0.65 ton/ton of clinker from a moderate rotary kiln in China. MCF used 70% of its total energy sources from imported fossil fuels, and transportation of the imported fuel added 1.2% CO2 to total emissions. A suggested fossil fuel use improvement scenario for MCF, where coffee husk replaces 50% of the imported coal improved the energy intensity, GHG emissions, and total cost of coal in clinker production by 1.2%, 14%, 36%, respectively.

The Future Burden of Industrial CO2 on the Atmosphere and the Oceans

1973 ◽  
Vol 28 (11) ◽  
pp. 1747-1752 ◽  
Author(s):  
K. E. Zimen ◽  
F. K. Altenhein
Keyword(s):  
Fossil Fuels ◽  
Fossil Fuel ◽  
Maximum Level ◽  
Logistic Function ◽  
Ecological Systems ◽  
Energy Sources ◽  
Rate Of Increase ◽  
Future Burden ◽  
Present Rate ◽  
Exchange Kinetics

The cumulated input of industrial CO2 into the atmosphere during the next 100 years or so will be about 10 times the natural C02 content if the present rate of increase is restricted only by the finiteness of fossil fuel resources. The resulting surplus of CO2 in the atmosphere and the oceans as a function of time is calculated using the equations for the exchange kinetics between the reservoirs and the logistic function. The results indicate a transient maximum level of roughly 300% over pre-industrial figures in the atmosphere as well as in the mixed ocean surface. This level would be reached during the second half of the next century, if fossil fuels are not going to be replaced by other energy sources much faster than can be anticipated at the present time. Long before the maxi- mum level is reached the increase will probably have serious consequences for the ecological systems in the sea.

scholarly journals Experimental Investigation on Performance, Combustion, Emission and Vibration Analysis of Diesel Engine Fuelled with Rice Bran Biodiesel and n-Butanol Additive

2021 ◽  
Author(s):  
Rajendra Pawar ◽  
◽  
Sharad Patil ◽  
Kamalesh Jagadale ◽  
Pranali Gujar ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Rice Bran ◽  
Diesel Fuel ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Nitric Oxides ◽  
Promising Alternative ◽  
Fuel Prices ◽  
Engine Cylinder ◽  
Combustion Emission

Substantial growth in emissions, hike in fuel prices, and exhaustion of fossil fuels has given rise to the need for substitute fuels for diesel engines, which are renewable and demote the emission. Also, strict international emission standards force researchers to seek alternative fuels. Vegetable oils are promising alternative biodiesel for a diesel engine, amongst them, rice bran is underutilized, a non-edible source that doesn’t create any food security hurdle. The paper focused to investigate the performance, combustion, emission, and vibration characteristics of diesel engine fuelled with rice bran biodiesel and n- butanol additive (5% constant) at CR 17.5. The engine characteristics of seven biodiesel blends (B5n5, B10n5, B15n5, B20n5, B25n5, B30n5, and B40n5) were measured at various loads under constant speed and compared with diesel fuel. The performance characteristics were observed in moderate quantities as compared to diesel whereas the emissions were found reduced drastically than diesel fuel except for nitric oxides (NOx) emissions. The measured engine cylinder vibration for all blends indicates similar results as diesel fuel hence leads to smooth combustion. The investigation shows that blends from B20n5 to B30n5 have the potential to be used in a diesel engine without any modification.

scholarly journals Risks of switching to renewable energy sources

2021 ◽  
Vol 101 ◽  
pp. 01010
Author(s):  
E.S. Romanova ◽  
A.A. Masalkova
Keyword(s):  
Climate Change ◽  
Renewable Energy ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Renewable Energy Sources ◽  
Research Work ◽  
Energy Transition ◽  
Energy Sources ◽  
International Treaties ◽  
Carbon Dioxide Co2

This research work is devoted to the issue of studying the key risks of switching to renewable energy sources. The relevance of the topic of work is determined by the fact that, according to climatologists [5], climate change, which has a negative impact on the environment, is caused by the emission of greenhouse gases such as carbon dioxide (CO2). For this reason, measures to prevent or reduce greenhouse gas emissions are at the heart of the energy transition. International treaties such as the Kyoto Protocol and the Paris Agreement lay the foundations for global action to combat climate change and implement a fourth energy transition. The energy transition is characterized by a number of incentives and barriers. Despite the fact that there are many scenarios for the development of the global energy sector by 2050, the expected transformations of the energy market lead to a significant redistribution of the ratio of the shares of hydrocarbon sources and renewable energy sources [16]. The trend towards fossil fuels is on the rise. These transformations in the market are determined not only by the climate agenda, but also by the concept of sustainable economic development.

Transitioning to Renewable Sources of Electricity: Motivations, Policy, and Potential

2014 ◽  
Author(s):  
Chelsea Schelly
Keyword(s):  
Renewable Energy ◽  
Carbon Dioxide Emissions ◽  
Fossil Fuels ◽  
Fossil Fuel ◽  
Renewable Energy Sources ◽  
Good News ◽  
Energy Sources ◽  
Renewable Sources ◽  
Transmission Grid ◽  
Electricity Infrastructure

The electricity grid in the United States may be the largest, most pervasive technological system ever constructed to meet the needs and comforts of human beings (Nye 1997). Although it is less than 150 years old, the electricity infrastructure of this nation is ubiquitous; power lines stretch across deserts, forests, states, highways, and the entire nation in order to provide electricity to residences, businesses, and communities. The electricity carried by these transmission lines is generally produced using fossil fuels (mostly coal; see US Energy Information Administration 2012) and is most commonly generated at a monstrously large facility (a coal plant, a nuclear facility, or a hydropower dam). Our electricity infrastructure was constructed to carry enormous amounts of electricity across vast geographical expanses, based on the massive generation facilities and concentrated fossil fuel based energy sources that defined the system and its use. However, there are increasing concerns regarding the sources of our energy supply. Many of these concerns are related to climate change and how carbon dioxide emissions from burning fossil fuels contribute to rising global temperatures and the climate instability of the planet (Brown 2003). Additional concerns include the host of other environmental damages caused by the use of coal (Epstein et al. 2011), nuclear energy (Slovic et al. 1991), and hydro-electricity (Dincer 1998); other debates involve worries about nearing or reaching peak energy supplies (Brown 2003), energy security (Yergin 2006), and the aging transmission grid (Amin 2003). For a multitude of reasons, many would agree that it’s time to rethink our dependence on fossil fuel based forms of energy and move toward alternative, renewable energy sources (Brown 2003, pp. 116–135). The good news is, the renewable energy industry gets bigger every year, with more energy from renewable sources being produced, sold, and used (Sherwood 2011). Some US states have enacted renewable energy standards requiring that a certain percentage of their electricity supply come from renewable sources. Tax incentives, subsidies, and various forms of rebates, in financially incentivizing renewable energy adoption, also provide evidence that we are indeed moving in the direction of clean, renewable sources of energy.

scholarly journals Trends in Scientific Literature on Energy Return Ratio of Renewable Energy Sources for Supporting Policymakers

2020 ◽  
Vol 10 (2) ◽  
pp. 21 ◽  
Author(s):  
Roberto Leonardo Rana ◽  
Mariarosaria Lombardi ◽  
Pasquale Giungato ◽  
Caterina Tricase
Keyword(s):  
Renewable Energy ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Fossil Fuel ◽  
Renewable Energy Sources ◽  
Ghg Emissions ◽  
Energy Sources ◽  
Economic Systems ◽  
Solar Photovoltaic ◽  
Academic Literature

The scarcity of fossil fuels and their environmental impact as greenhouse gas (GHG) emissions, have prompted governments around the world to both develop research and foster the use of renewable energy sources (RES), such as biomass, wind, and solar. Therefore, although these efforts represent potential solutions for fossil fuel shortages and GHG emission reduction, some doubts have emerged recently regarding their energy efficiency. Indeed, it is very useful to assess their energy gain, which means quantifying and comparing the amount of energy consumed to produce alternative fuels. In this context, the aim of this paper is to analyze the trend of the academic literature of studies concerning the indices of the energy return ratio (ERR), such as energy return on energy invested (EROEI), considering biomass, wind and solar energy. This could be useful for institutions and to public organizations in order to redefine their political vision for realizing sustainable socio-economic systems in line with the transition from fossil fuels to renewable energies. Results showed that biomass seems to be more expensive and less efficient than the equivalent fossil-based energy, whereas solar photovoltaic (PV) and wind energy have reached mature and advanced levels of technology.

scholarly journals Perspectives of Use of Alternative Energy Sources in Air Transport

2017 ◽  
Vol 5 (1) ◽  
pp. 12-16
Author(s):  
Luboš Socha ◽  
Vladimír Socha ◽  
Peter Čekan ◽  
Daniela Čekanová ◽  
Lenka Hanáková ◽  
...  
Keyword(s):  
Alternative Energy ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Air Transport ◽  
Energy Sources ◽  
Synthetic Fuels ◽  
Paper Briefly ◽  
Alternative Energy Sources ◽  
Alternative Sources

The problem of environmental load is also reflected in air transport. Usage of fossil fuels, which are dominant nowadays, has a negative impact on the environment and also its resources are limited. Therefore, the article focuses on the prospective of use of other energy sources in aviation, such as alternative fuels (synthetic fuels, biofuels, alcohol, methane, hydrogen), solar energy and the use of fuel cells. Also, the paper briefly summarizes the approach of aircraft manufacturers to the use alternative sources.

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