Attaphong, Chodchanok

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Preferred name
Attaphong, Chodchanok
Alternative Name
Attaphong, C.
Main Affiliation
Email
chodchanok.at@kmitl.ac.th

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    Phase stability, fuel properties, and diesel engine performance of palm-oil-based microemulsion biofuels
    (2023-05-01)
    Attaphong, Chodchanok
    ;
    Morawan, Nattaya
    ;
    Sarikprueck, Piampoom
    ;
    Charoensaeng, Ampira
    ;
    Khaodhiar, Sutha
    Microemulsification and blending are two viscosity-modifying techniques of vegetable oils for direct use with diesel engine. In this study, alcohol blends are mixtures of ethanol, diesel, and palm-oil biodiesel while microemulsion biofuels are thermodynamically stable, clear, and single-phase mixtures of diesel, palm oil, and ethanol stabilized by surfactants and cosurfactants. Although there are many studies on biofuels lately, there is limited research on using biodiesel as a surfactant in microemulsion formulations and applied on engine performance at different engine loads. Therefore, the objectives are to investigate phase stability and fuel properties of formulated biofuels (various blends and microemulsions), to determine the engine performance at different engine loads (no load, and from 0.5 to 2.0 kW), and to estimate laboratory-scale cost of the selected biofuels compared to diesel and biodiesel. The results showed that phase stability and fuel properties of selected microemulsion biofuels are comparable to diesel and biodiesel. These microemulsion biofuels can be applied to the diesel engine at different loads while diesel-ethanol blends and palm-oil-biodiesel-ethanol blends cannot be. It was found that the energy efficiencies of the system using microemulsion biofuels were slightly lower than the average energy efficiency of diesel engine. From this study, it can be summarized that microemulsion biofuels can be formulated using palm-oil biodiesel (palm-oil methyl ester) as a bio-based surfactant and they can be considered as environmentally-friendly alternatives to diesel and biodiesel. However, cost considerations showed that the raw materials should be locally available to reduce additional costs of microemulsion biofuels.
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    Environmental Impact Assessment of Lead-Acid and Lithium-ion Battery Waste Management in Thailand
    (2024-01-01)
    Morawan, Nattaya
    ;
    Mungkhala, Issariya
    ;
    Attaphong, Chodchanok
    ;
    Katers, John
    ;
    Sarikprueck, Piampoom
    This study used material flow analysis and life cycle impact assessment to evaluate the management of lead-acid and lithium-ion batteries in Thailand in 2022. Four scenarios were designed, employing two methods: landfilling and material recovery. Landfilling lead-acid and lithium-ion batteries showed significant negative environmental impacts. Lead recovery for lead-acid batteries waste also had negative impacts due to slag generation. However, metal recovery of lithium-ion battery waste, which recovered lithium carbonate and cobalt carbonate, demonstrated positive environmental outcomes. When comparing the two methods, landfilling was preferable for lead-acid batteries, whereas metal recovery was better for lithium-ion batteries. These findings provide essential information for battery management guidelines in Thailand and indicate that future research should explore additional methods and their economic aspect.