Evita H. Legowo

Evita H. Legowo
Swiss German University

About

21
Publications
5,065
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33
Citations

Publications

Publications (21)
Conference Paper
Biodiesel has been considered as an alternative fuel to replace conventional oil in the world. Biodiesel development has reached blending for 30% and has been implemented by Indonesia since 2020. Sources for biodiesel production vary, as is well known, mostly from CPO, raw vegetable oil, used cooking oil, and animal fats. The utilization of waste a...
Conference Paper
Indonesia is the leading country of palm oil producers, it reaches a total area of 12.5 million hectares plantation. It generates excessive wastes as well. From those wastes, Oil Palm Frond (OPF) contributes to 61% of it. It is usually being left as a waste in the natural environment or become a fertilizer around the plantation. Instead of leaving...
Article
Full-text available
Biodiesel is a product resulted from the process of transesterification of vegetable oil or animal fat. Biodiesel is a renewable fuel and uses as alternative to fossil fuel diesel. However, one of the biodiesel drawbacks which is oxidation can affect the storage stability of the biodiesel. One way to solve this issue is by using antioxidant additiv...
Article
Palm Fatty Acid Distillate (PFAD) resulted from refinery process of crude palm oil (CPO) contains some beneficial bioactive compounds such as squalene, which is one of the best natural emollients for pharmaceuticals and cosmetics. The need to overcome the problem with the abundant amount of PFAD as a waste has led to the attempts to extract squalen...
Article
Increasing concern in fossil fuel depletion and CO2 emissions create an urgent need for biofuel substitution. Bio-jet fuel is a possible alternative for conventional jet fuels which currently accounts for 2% of the world’s CO2 emission. Palm Fatty Acid Distillate (PFAD) is the byproduct of palm oil refinery process, which has a potential to become...
Article
The global pandemic spread of influenza like bird flu and swine flu are forcing abigger production of anti-influenza drug called Oseltamivir phosphate. The drug is made by synthesizing a compound named shikimic acid. Although the demand of the drug increases, the source of shikimic acid material is limited. Meanwhile, palm oil mill effluent (POME),...
Article
Natural gas is a source of energy that comes from the earth which is depleting every day, an alternative source of energy is needed and one of the sources comes from biogas. There is an abundance of empty fruit bunch (EFB) that comes from palm oil plantation that can become a substrate for biogas production. A methodology of fermentation based on V...
Article
Full-text available
Molasses is mostly used as feedstock for the bioethanol production in Indonesia. Bioethanol industries has the potential to be more developed if the mandate of blending gasoline with 5% bioethanol is implemented. However, some previous studies abroad have shown that mostly the net energy for producing bioethanol is negative. The main purpose of thi...
Article
Nowadays, aviation sector became one of the most important transportation in the world. The demand in this sector has increased rapidly over the last 10 years. Unfortunately, the increase of the demand leads to an increase of fuel consumption and CO2 emission in the aviation’s sector. Bio-based aviation fuel is believed to be one of the solution fo...
Conference Paper
Full-text available
Squalene is a compound widely known as one of the natural antioxidants used in the cosmetic and pharmaceutical industries. As the main source of squalene, which is shark liver oil, is becoming more limited in its availability, attempts have been made to extract squalene from other sources, e.g. from vegetable oils. Research has found that one of th...
Conference Paper
Full-text available
Squalene is a hydrocarbon originally and still mostly extracted from shark liver oil. Due to environmental issues over shark hunting, there have been efforts to extract squalene from alternative sources, such as Palm Fatty Acid Distillate (PFAD), one of crude palm oil (CPO) wastes. Previous researches have shown that squalene can be extracted from...
Article
Full-text available
One of the issues in bioethanol production as fuel is the low productivity of fermentation process. Application of serial continuous bioreactor could increase the fermentation productivity. Series of bioreactor running in aerobic condition followed by anaerobic fermentation may resolve cell exhaustion and low substrate utilization problems, as pre-...
Conference Paper
Full-text available
:Microbial contamination reduction for bioethanol raw material is commonly achieved through heat sterilization process. However, heat sterilization process could contribute up to 64.5% of the total energy requirement of bioethanol production; therefore microbial contamination reduction process at lower temperature is preferable. This research studi...
Chapter
New and renewable energy development should be encouraged because Indonesia is net importer of oil. Government subsidy for transportation and electricity is more than Rp 300 trillion per year. Presidential Decree No. 5, 2006, mandates that energy-mix target by 2025 will be 17 % for new and renewable energy. The demand growth of energy is about 7 %,...
Article
Microbial EOR (MEOR) is a promising method for improved oil recovery through microbial activities. MEOR processes were investigated via coreflood experiments using standard and native cores, and activated microbes from the Cepu oil field in Indonesia. The microbes and medium selected were LDK-230 formation water enriched with Bacillus sp.kkl-11, an...
Article
Crude oils are colloidal systems in which asphaltenes and resins are colloidally dispersed in an oil phase consisting mainly of saturated aliphatic hydrocarbons and of aromatic compounds. In the asphaltenes and resins, the surface active compounds of the crude oil are enriched. In this study, the influence of asphaltenes and resins on the interfaci...

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