Browsing by Author "Legawati, Lisa"

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    Analisis Konfigurasi Sistem Produksi Hidrogen dari Etanol Produk Fermentasi yang Melibatkan Unit Membran
    (2013-05-08) Legawati, Lisa; Rionaldo, Hari; Zulfansyah
    Ethanol from fermentation process must be purified to 99% to meet the requirements as a fuel. Ethanol and water are azeotrope mixture, so that the separation requires larger investment and greater energy. Produce hydrogen from ethanol reforming is one solution to get another energy source in the form of environmentally friendly hydrogen gas. H2 production from ethanol has advantages when compared with other H2 production techniques. Nowdays, hydrogen is one of alternative energy source that is currently widely studied and developed as a fuel for fuel cells to generated electricity. Membrane integration of hydrogen production system by ethanol reforming can produce hydrogen gas with high purity and suitable for use as a fuel for fuel cells. There are three type of configurations involving a palladium based membrane is simulated to obtain the best type of configuration, viewed from the conversion and yield of the product. Ethanol reforming membrane reactor is the best configuration type, because it produces the best result viewed from the yield generated, amounting to 21,4%. However, it should be noted that the merger of the membrane unit with the reaction can reduce the hydrogen permeability.
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    Growth Kinetics of Microorganisms In Composting Processof Empty Fruit Bunch
    (2016-04-22) Legawati, Lisa; Ahmad, Adrianto; Helwani, Zuchra
    CPO production increased resulting in the amount of waste also increased, such as solid waste Empty Fruit Bunch (EFB). The composting process is one alternative method for reducing environmental pollution caused by waste EFB. However, the composting process takes a long time. Therefore, it is important to do a breakthrough to speed up the processing time. In this research, EFB composting process is done by adding a mixed culture that is useful as a starter and POME as a nutrition source. The purpose of this research was to determine the kinetic parameters of growth of microorganisms in the composting process Empty Fruit Bunch (EFB) as information on the scale-up bioreactor. Aerobic composting process takes place with variations in source of microorganisms, they are without the addition of mixed cultures; the addition of mixed cultures with a concentration of 60%; and the addition of mixed cultures 60% + POME. Stages of this researchare the preparation of a starter, substrate preparation, preparation windrow, and the composting process. operating conditions of the composting process are a moisture content of 40-60%, 30-50 0C temperature, and pH 6 to 8.5. The results showed that the reduction in C/N ratio in the composting process of EFB by adding POME faster in the amount of 19,77 on day 32 with a value of kinetic parameters are μmax 0.63 day-1, the value of yield 0,014, and Ks amounted to 32,32 g / L.