Browsing by Author "Natthiporn Aramrueang"

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    Characterization and compositional analysis of agricultural crops and residues for ethanol production in California
    (2017-01-01) Natthiporn Aramrueang; Steven M. Zicari; Ruihong Zhang; University of California, Davis; Mahidol University
    © 2017 This study was carried out in order to analyze characteristic and composition of crops, crop wastes, and residues including a variety of sugar beets and melons, tomato, Jose tall wheatgrass, wheat hay, and wheat straw in California. Ethanol potential was estimated from different scenarios in using carbon sources of feedstock during fermentation, including the new information of using pectin–derived galacturonic acid for ethanol production. Sugar beet appears more favorable than other feedstocks because of its high sugar content (67–75% dry basis, db) and the highest crop yield, resulting in the greatest ethanol potential of 591 m3Gg−1db when all carbohydrates are used during fermentation, with the California area–based potential of 1273 m3km−2. Fermentation of polygalacturonic acid can increase the ethanol potential of sugar beet leaves up to 30% over the fermentation of hexoses alone, increasing the theoretical ethanol potential to 340 m3Gg−1and the area–based yield of 497 m3km−2. Melons and tomato containing 42–69% by mass of soluble sugars showed ethanol potentials in a range of 448–545 m3Gg−1db and the area–based yield of 25–53 m3km−2. The theoretical ethanol yield from lignocellulosic feedstocks tested can be maximized up to 470–533 m3Gg−1db and 291–300 m3km−2when the primary components from cellulose (27–39% db) and hemicellulose (26–30% db) are utilized. The information on composition and ethanol potential is important for determining biofuel feedstock and developing technology for efficient use of bioresource.
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    Effects of hydraulic retention time and organic loading rate on performance and stability of anaerobic digestion of Spirulina platensis
    (2016-07-01) Natthiporn Aramrueang; Joshua Rapport; Ruihong Zhang; University of California, Davis; Mahidol University
    © 2016 IAgrE. The effects of hydraulic retention time (HRT) and organic loading rate (OLR) were investigated during a continuous anaerobic digestion of Spirulina platensis. The continuous process operated with varying HRT (10-25 d) and OLR (1.0-4.0 [g VS] l-1d-1) resulted in the biogas and methane yields in the range of 0.276-0.502 l [g VS]-1and 0.163-0.342 l [g VS]-1, respectively. The methane yield decreased with the increase in OLR and the reduction in HRT. Maximum methane yield of 0.342 l [g VS]-1was produced when the digester was operated at OLR of 1.0 [g VS] l-1d-1and 25 d HRT. A mathematical model was developed from a kinetic study for predicting methane yield as the function of HRT during a continuous digestion. The model performed well at OLR lower than 2.0 [g VS] l-1d-1, at which the digestion was not limited by high ammonia levels or volatile fatty acid accumulation.
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    Improving continuous anaerobic digestion of cassava pulp by potassium hydroxide pretreatment
    (2021-01-01) Passanun Lomwongsopon; Natthiporn Aramrueang; Mahidol University
    Cassava pulp (CP), a by-product from a large cassava industry in Thailand, is a potential feedstock for anaerobic digestion. However, its complex structure from fibers is hardly digested, causing low hydrolysis rate, accumulation of solids, and digester failure at high organic loadings. Chemical pretreatment has been used to overcome hydrolysis limitation. Among various alkalis, potassium hydroxide (KOH) has benefit on improvement of methane yield and digestate quality as biofertilizer. This study aimed to investigate the effect of KOH pretreatment during continuous anaerobic digestion for methane production from CP. Pretreatment with KOH at the concentration of 0.5-3.0% (w/v) increased 29-54% for COD solubilization. Pretreatment with 0.5% KOH reduced hemicellulose and lignin content for 58 and 24%, respectively. Biomethane potential (BMP) assay of pretreated CP with 0.5% KOH produced methane yield of 321 ml CH4/gVS, accounting for 25% improvement than that of untreated CP. The effect of pretreatment on biogas production by mesophilic continuous anaerobic digestion was investigated. Methane yield of pretreated CP was at 337 ± 20 ml/gVS, which is not significantly different from that of untreated CP. However, pretreatment reduced the accumulation of total suspended solids in the digester by 55%, which benefits the stability of the digestion at higher organic loading rates.