SHIRAI Yoshihito





2-4 Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka

Research Fields, Keywords

Recycle, Zero-Emission

Degree 【 display / non-display

  • Kyoto University -  Ph.D.  1988.05

Biography in Kyutech 【 display / non-display

  • 2014.04

    Kyushu Institute of TechnologyGraduate School of Life Science and Systems Engineering   Department of Biological Functions Engineering   Professor  


Publications (Article) 【 display / non-display

  • Surface modification for nano-lignocellulose fiber through vapor-phase-assisted surface polymerization

    Eksiler K., Andou Y., Ariffin H., Shirai Y.

    Journal of Polymer Science, Part A: Polymer Chemistry    57 ( 24 ) 2575 - 2580   2019.12  [Refereed]

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    © 2019 Wiley Periodicals, Inc. This study addresses the inherent issues surrounding surface modification methods of nanofibers and proposes an environmentally friendly and less toxic strategy for the surface modification of hydrophilic nanofiber. From the continuation of our previous work, which discussed the easy production of nanofiber (average size: 127 nm) from oil palm mesocarp fiber (OPMF), in this work, the surface of nanofibers (M-IL-OPMF) were modified through vapor-phase-assisted surface polymerization (VASP) to improve the affinity of interface between the polymer grafted M-IL-OPMF and non-polar matrix. VASP of ε-caprolactone was successfully proceeded from the [M-IL-OPMF] at 70 °C for 24 h and 72 h, and compositions were estimated to be 35.7% fiber/64.3% polymer and 27.8% fiber/72.2% polymer. To confirm the grafting of PCL, size-exclusion chromatography (SEC) and Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry (TG), and dispersibility test in hydrophobic solvent were carried out. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 2575–2580.

    DOI Scopus

  • Convective sludge drying by rotary drum dryer using waste steam for palm oil mill effluent treatment

    Ahmad Farid M., Roslan A., Hassan M., Aziz Ujang F., Mohamad Z., Hasan M., Yoshihito S.

    Journal of Cleaner Production    240   2019.12  [Refereed]

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    © 2019 Elsevier Ltd Achieving a more sustainable wastewater treatment plant has never been so important. Issues around energy consumption and pollutants removal efficiency are of growing importance in the context of production costs and pollution control. In the palm oil industry, more than 85% mills are managing their palm oil mill effluent (POME) via lagoons, yet the system considered less effective as the quality of the effluent hardly achieved the permissible limits. It is therefore in the best interest of the industry to employ a better practice. Convective sludge drying (CSD) has been shown to have exceptional efficiency in high-strength wastewater treatment. In this study, CSD epitomized the zero-emission of POME treatment due to the fact that; 1) It operates on low-grade steam discharged by the mill instead of electricity, leading to a huge cut on energy consumption, 2) Production of secondary micronutrients-enriched solids by-product (i.e., calcium and magnesium) that can be repurposed as fertilizer, and 3) The decoction produced can potentially be reused to irrigate the existing oil palm plantation for nutrient cycling. The treatment resulted in substantial removal of the chemical oxygen demand (COD), biological oxygen demand (BOD), suspended solids (SS), ammoniacal nitrogen (AN), and oil and grease (OG) down to 2 mg/L, 67.7 mg/L, 40.0 mg/L, <0.01 mg/L, and <1 mg/L, respectively, which meets the Standard-A of Malaysia Environmental Quality Regulation (2009), making it sourceable for domestic usage. Reported groundworks demonstrated that CSD was superior to other physicochemical methods in POME treatment, with >99% of BOD, COD, SS, OG, and AN removal efficiency. The operating cost was valued at USD 1.91 per m3 POME. The pilot-scale operation proved CSD is a viable alternative to the lagoons.

    DOI Scopus

  • Life cycle assessment for bioethanol production from oil palm frond juice in an oil palm based biorefinery

    Mohd Yusof S.J.H., Roslan A.M., Ibrahim K.N., Abdullah S.S.S., Zakaria M.R., Hassan M.A., Shirai Y.

    Sustainability (Switzerland)    11 ( 24 )   2019.12  [Refereed]

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    © 2019 by the authors. A study was conducted to estimate the possible environmental impacts arising from the generation of bioethanol from oil palm frond sugar juice in a theoretical oil palm based biorefinery model. A life cycle assessment (LCA) with the gate-to-gate approach was performed with the aid of SimaPro version 8.0 whereby ten impact categories were evaluated. The scope included frond collection and transportation, frond sugar juice extraction, and bioethanol fermentation and purification. Evaluation on the processes involved indicated that fermentation contributed to the environmental problems the most, with a contribution range of 52% to 97% for all the impact categories. This was due to a substantial usage of nutrient during this process, which consumes high energy for its production thus contributing a significant burden to the surrounding. Nevertheless, the present system offers a great option for biofuel generation as it utilizes sugar juice from the readily available oil palm waste. Not only solving the issue of land utilization for feedstock cultivation, the enzymatic saccharification step, which commonly necessary for lignocellulosic sugar recovery could also be eliminated.

    DOI Scopus

  • A highly thermostable crude endoglucanase produced by a newly isolated Thermobifida fusca strain UPMC 901

    Zainudin M., Mustapha N., Hassan M., Bahrin E., Tokura M., Yasueda H., Shirai Y.

    Scientific Reports    9 ( 1 )   2019.12  [Refereed]

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    © 2019, The Author(s). A thermophilic Thermobifida fusca strain UPMC 901, harboring highly thermostable cellulolytic activity, was successfully isolated from oil palm empty fruit bunch compost. Its endoglucanase had the highest activity at 24 hours of incubation in carboxymethyl-cellulose (CMC) and filter paper. A maximum endoglucanase activity of 0.9 U/mL was achieved at pH 5 and 60 °C using CMC as a carbon source. The endoglucanase properties were further characterized using crude enzyme preparations from the culture supernatant. Thermal stability indicated that the endoglucanase activity was highly stable at 70 °C for 24 hours. Furthermore, the activity was found to be completely maintained without any loss at 50 °C and 60 °C for 144 hours, making it the most stable than other endoglucanases reported in the literature. The high stability of the endoglucanase at an elevated temperature for a prolonged period of time makes it a suitable candidate for the biorefinery application.

    DOI Scopus

  • A one-step self-sustained low temperature carbonization of coconut shell biomass produced a high specific surface area biochar-derived nano-adsorbent

      37 ( 5 ) 551 - 555   2019.05  [Refereed]

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    © The Author(s) 2019. A one-step self-sustained carbonization of coconut shell biomass, carried out in a brick reactor at a relatively low temperature of 300–500°C, successfully produced a biochar-derived adsorbent with 308 m 2 /g surface area, 2 nm pore diameter, and 0.15 cm 3 /g total pore volume. The coconut shell biochar qualifies as a nano-adsorbent, supported by scanning electron microscope images, which showed well-developed nano-pores on the surface of the biochar structure, even though there was no separate activation process. This is the first report whereby coconut shell can be converted to biochar-derived nano-adsorbent at a low carbonization temperature, without the need of the activation process. This is superior to previous reports on biochar produced from oil palm empty fruit bunch.

    DOI Scopus

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Conference Prsentations (Oral, Poster) 【 display / non-display

  • Environmental performance of bioethanol production from oil palm frond petiole sugars in an integrated palm biomass biorefinery

    Yusof S., Roslan A., Ibrahim K., Abdullah S., Zakaria M., Hassan M., Shirai Y.

    IOP Conference Series: Materials Science and Engineering  2018.06  -  2018.06 

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    © Published under licence by IOP Publishing Ltd. Generation of biofuels from renewable resources such as lignocellulosic biomass is a promising approach to reduce the sole reliability on the depleting fossil fuel. The aim of this work is to assess the potential environmental impact of bioethanol production from oil palm frond in a conceptual oil palm based biorefinery model, utilizing wet disc milling as a pretreatment method. A cradle-to-gate approach was selected, beginning with the harvesting and transportation of the frond petiole from the plantation, followed by production of oil palm frond petiole sugars via pretreatment and saccharification prior to bioethanol fermentation, and finally purification of the fermentation products to obtain anhydrous bioethanol. A life cycle assessment was performed using CML 2 baseline 2000 method (SimaPro v8.0), where ten impact categories were evaluated. It was found that the most significant environmental impact was from sugar recovery process with contribution of more than 90 %. This is mainly due to high power consumption by wet disc milling during pretreatment. Apart from that, production of enzyme and chemicals which were used during saccharification consumes high energy thus contributing major problems to the surrounding. Finding of this study helps to identify the hotspot which can be improved to establish a more energy efficient and greener system for bioethanol production from oil palm frond petiole sugars.

  • 4.ポリ乳酸製品のケミカルリサイクルとLCA評価, (2005).

    高分子学会  2006.04  -  2006.04 

  • 5. L,L -ラクチドのエステル-ヘミアセタール互変異性化

    高分子学会   2006.04  -  2006.04 

  • 3 ポリ乳酸/ポリマーブレンド体のケミカルリサイクル性に及ぼす触媒の効果,

    高分子学会   2006.04  -  2006.04 

  • 2 反応押出機によるPLLA/汎用樹脂混合樹脂からのラクチドの効率的回収,

    高分子学会  2006.04  -  2006.04 

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