Srisang, Siriwan

Preferred name

Srisang, Siriwan

Main Affiliation

KMITL Prince of Chumphon Campus

siriwan.sr@kmitl.ac.th

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Enhanced biodiesel purification using coffee husk bioadsorbents: The role of pyrolysis temperature, KOH activation, and adsorption efficiency
(2025-05-01)
Chungcharoen, Thatchapol
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Limmun, Warunee
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Srisang, Siriwan
;
Phetpan, Kittisak
;
Ruttanadech, Nuttapong
This study evaluates the performance of bioadsorbents derived from coffee husk pyrolyzed at temperatures of 600, 700, and 800 °C (CH600, CH700, and CH800), along with activated CH700 (ACH700), in biodiesel purification. The results indicate that CH700 significantly enhances biodiesel purity, with optimal purification conditions achieved at a dosage of 2 wt% CH700, a stirring rate of 400 rpm, and a contact time of 45 min. CH700 demonstrated modest performance, achieving approximately 20 % removal of methanol and water. However, after activation with potassium hydroxide (KOH), ACH700 demonstrated improved efficiency, achieving 96.92 % methanol removal and 39.46 % water removal. ACH700 also refined biodiesel quality to meet EN14214 standards and maintained a higher biodiesel yield compared to other adsorbents. The bioadsorption process is influenced by the chemical interactions between the surface functional groups of the bioadsorbent and the contaminants, which is further enhanced by the optimized pore structure of ACH700. The use of ACH700 represents a novel and highly effective approach to biodiesel purification, combining both technical efficiency and economic feasibility. Furthermore, the valorization of agricultural waste adds significant environmental benefits, reinforcing the potential of ACH700 for large-scale biodiesel production.
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Fabrication of Eco-Friendly Pineapple Leaf Fiber-Based Vegan Leather for Environmental Sustainability
(2026-01-20)
Srisang, Siriwan
;
Kunyuan, Jumpon
;
Hutangkoon, Thunyanat
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Eiangmee, Orranat
;
Maikaew, Jatuphat
The environmental impact of synthetic leather production has raised global concerns due to its reliance on petroleum-based polymers and poor biodegradability. Therefore, the development of sustainable, eco-friendly alternatives using renewable resources has become increasingly important. A biodegradable vegan leather was developed from natural rubber and pineapple leaf fibers (PALF), with properties analyzed using Response Surface Methodology (RSM). The effects of fiber content (X1), compression time (X2), and compression temperature (X3) were studied on biodegradation (Y1), water absorption (Y2), and tensile strength (Y3). Results showed that all three factors significantly influenced Y1, with the predictive model demonstrating high reliability (R > 90%). The optimum condition for Y1 was X1 = 3.0 g, X2 = 70.0 min, and X3 = 110.0 C, yielding a maximum predicted biodegradation of about 21%. In contrast, the models for Y2 and Y3 were statistically unreliable (P > 0.05) due to low RÂ² values. However, Y2 passed the lack-of-fit test, suggesting an adequate model form, while Y3 failed (P < 0.05), indicating an inadequate prediction model. These findings suggest future experiments should narrow factor ranges and include additional control variables to improve the predictability of Y2 and Y3. Despite these limitations, the study highlights a sustainable alternative to conventional synthetic leather, aligning with circular economy principles and supporting the United Nations Sustainable Development Goals (SDGs). Importantly, the process is resource-efficient: from 1 kg of pineapple leaves, only 20 g of fibers is obtained, and just 75 g of PALF was used in 15 experimental runs. This minimal material requirement underscores the potential of the approach for sustainable production, while highlighting potential applications in sustainable fashion, packaging, and eco-friendly product design.
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An innovative chitosan-coated aquatic feed pellets production from coastal waste using top-spray fluidized bed drying
(2026-12-01)
Maikaew, Jatuphat
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Srisang, Naruebodee
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Tambunlertchai, Supreeda
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Srisang, Siriwan
Coastal wastes such as crab shells, shrimp shells, and seaweed are rich in proteins, lipids, and bioactive compounds, making them valuable raw materials for aquafeed production. In this work, three aquatic feed pellets were developed and tested under different drying temperatures from 70 to 110 °C to evaluate the pellet durability index (PDI), specific energy consumption in water removal (SEW), and nutrient quality. The formulation containing high crab shell content showed the most balanced nutritional profile but required further improvement in mechanical strength. To address this, chitosan coating was applied using a top-spray fluidized bed system, with process conditions optimized through response surface methodology (RSM). The RSM demonstrated the optimal coating condition at a concentration of about 1.25% (w/v), a spray rate of about 32.5 mL/min, and a temperature of about 110 °C, with the lowest of drying time (DT) and specific energy consumption (SEC). The optimized coating significantly improved PDI and water solubility index while preserving nutritional balance. It also enhanced antimicrobial properties, which are desirable for feed storage. Microscopic and structural analyses confirmed good adhesion of the coating. Overall, this study demonstrates a sustainable pathway to convert coastal waste into high-quality aquafeed, offering both environmental benefits and practical value for aquaculture industries.
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Preparation and evaluation of blend polymer films for wound dressing using vancomycin-loaded polycaprolactone and carboxymethyl cellulose via crosslinking methods: Effect of mechanical strength, antibacterial activity, and cytotoxicity
(2024-03-01)
Meedecha, Paweena
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Srisang, Naruebodee
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Eawsakul, Komgrit
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Ongtanasup, Tassanee
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Tambunlertchai, Supreeda
Polycaprolactone (PCL) and carboxymethyl cellulose (CMC) are two materials with beneficial properties for wound healing applications. Here, the simple preparation of PCL/CMC polymer films via the crosslinking method was demonstrated for the first time. The polymer films represented the suitable properties of liquid absorption and tensile strength to be used as a wound dressing. The blend polymer films can also load the vancomycin, which prolongs the drug release for effectiveness against S. aureus. The trifluoroethanol showed less toxicity in comparison with other crosslinking agents. This process can also be applied further in other medical devices and wound healing applications.
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Biodiesel Washing by the Prototype of a Biodiesel Washing Machine with Biochar
(2025-11-01)
Fonghiransiri, Surasak
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Chungcharoen, Thatchapol
;
Choola-Aied, Orasa
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Srisang, Siriwan
;
Srisang, Naruebodee
Currently, the prevalent technique for biodiesel washing entails the utilization of water in the purification process. Nevertheless, this method incurs substantial biodiesel loss and gives rise to wastewater, posing potential environmental consequences. Hence, this study aimed to utilize biochar for removing impurities from biodiesel by using a prototype of a biodiesel washing machine with biochar. The effects of the propeller blade number, propeller blade angle, and mixing time on the capability to eliminate impurities in biodiesel were elucidated. The results indicated that the biodiesel washing machine can increase biodiesel yield by up to 2.49% (91.54%) compared to the water washing process (89.05%). The increased propeller blade number, angle, and mixing time can improve the acidity (24.50-64.04%) and water content removal (42.61-79.56%). Consequently, this led to a decrease in density (865.85-886.83 kg/m<sup>3</sup>) and viscosity (3.997-4.321 cSt). The conditions with the best biodiesel properties were five propeller blades, a propeller blade angle of 60 degrees, and a mixing time of 30 minutes. These conditions provided the 63.88% acid removal, 79.49% water content removal, viscosity of 878.92 kg/m<sup>3</sup> and density of 4.208 cSt. Moreover, the methanol and glycerol contents were 0.02% wt. and 0.04% wt., respectively. These properties meet the ASTM 6751 and EN 14214 biodiesel standards.

Srisang, Siriwan

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