[24 Oct, 2022/Only face-to-face] 111th Hiroshima University ACE Seminar(130th Mechanical Systems Seminar)

Date & Time

Mon., October. 24, 2022 16:20~17:50


Engineering 109 Lecture Room, Higashi-Hiroshima Campus, Hiroshima University
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For the layout of the lecture rooms, click here. (Japanese page)

Participation fee



The Production of Bioenergy from Indonesian Marine Macroalgae via a Hydrothermal Process


Dr. Obie Farobie
Assistant Professor
Department: Mechanical and Biosystem Engineering
IPB University (Bogor Agricultural University)


Biomass-derived energy is gaining more attention due to environmental issues and increasing energy demand. To ensure the sustainability of fossil energy substitution using biomass, diversification of sources, including marine organisms, is vital. Macroalgae, considered the third-biomass generation, plays an essential role in energy production as they do not require arable land nor compete with crops. One of the most promising techniques to convert macroalgae, as a wet biomass, is hydrothermal processing, including hydrothermal liquefaction, carbonization, and gasification owing to the reduction of energy-intensive drying steps. Macroalgae with its composition has the potential to be used as feedstock for bioenergy. In this study, the potential of macroalgae using different process to harvest energy is discussed. Their yield, and characteristic as the products was studied. Lastly, the recommendation and the challenge of future development was also presented.


Sustainable Production of Bio-oil and Biochar Through Slow Pyrolysis of Ulva Lactuca


Dr. Apip Amrullah
Assistant Professor
Department of Mechanical Engineering
Lambung Mangkurat University


Ulva Lactuca is a fast-growing algae that can be utilized as a bioenergy source. However, the direct utilization of U. lactuca for energy applications still remains challenging due to its high moisture and inorganics content. Therefore, thermochemical processing such as slow pyrolysis to produce valuable added products, namely bio-oil and biochar, is needed. This study aims to conduct a thorough investigation of bio-oil and biochar production from U. lactuca to provide valuable data for its further valorization. A slow pyrolysis of U. lactuca was conducted in a batch-type reactor at a temperature range of 400?600 oC and times of 10?50 min. The results showed that significant compounds obtained in U. lactuca’s bio-oil are carboxylic acids (22.63?35.28%), phenolics (9.73?31.89%), amines/amides (15.33?23.31%), and N-aromatic compounds (14.04?15.68%). The ultimate analysis revealed that biochar’s H/C and O/C atomic ratios were lower than feedstock, confirming that dehydration and decarboxylation reactions occurred throughout the pyrolysis. Additionally, biochar exhibited calorific values in the range of 19.94?21.61 MJ kg-1, which is potential to be used as a solid renewable fuel. The surface morphological analysis by scanning electron microscope (SEM) showed a larger surface area in U. lactuca’s biochar than in the algal feedstock. Overall, this finding provides insight on the valorization of U. lactuca for value-added chemicals, i.e., biofuels and biochar, which can be further utilized for other applications.


Graduate School of Advanced Science and Engineering, Hiroshima University


E-mail :mat*hiroshima-u.ac.jp (Please replace * with @)