Papers by Prasert Pavasant
Chemical Engineering Research and Design
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Applied Environmental Research
The sequential extraction method was employed to investigate the distribution and chemical fracti... more The sequential extraction method was employed to investigate the distribution and chemical fractions of lead (Pb) in Klity Creek sediments, Kanchanaburi, Thailand with the main objective to define the lead mobility in sediment and potential bioavailability in relation to sediment contamination levels. Samples were collected from a total of twelve sampling sites distributed from upstream of the polluted zone until the final downstream point at Srinakarin Reservoir. The results showed that the background value of total lead concentration in the sediments from this area was higher than those reported from other locations in Thailand. Sequential extraction results revealed that lead was mainly associated with the reducible fraction especially in the polluted zone in the vicinity of the ore dressingplant. This is different from the distribution of lead fractions upstream and downstream of the polluted area, i.e. reducible fraction was the major component upstream whereas strongly dissoci...
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Environmental Progress & Sustainable Energy
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Sustainability, 2016
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Ultrasonics Sonochemistry, Sep 1, 2006
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Bioresource Technology, May 31, 2008
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Journal of Environmental Management, Aug 31, 2006
Raw water from the Bangkok (Thailand) main municipal water supply canal was examined for its natu... more Raw water from the Bangkok (Thailand) main municipal water supply canal was examined for its natural organic composition by fractionation with adsorption resins. DAX-8 resin was the first resin employed to fractionate the hydrophobic fractions. Fractionation at neutral pH resulted in the separation of the hydrophobic neutral components; at a high pH level (approx. 10) separation of the hydrophobic base components occurred; and at a low pH level (approx. 2) the hydrophobic acid components were separated. AG-MP-50 cationic resin was then used to separate the hydrophilic base components, and WA-10, a weak anionic resin, was applied finally to fractionate the hydrophilic acid and neutral components. Subsequently, each fraction was tested for its chlorine disinfection by-product (DBP) formation potential. The HAA formation tests demonstrated that the various organic fractions had different reactivity levels for the formation of haloacetic acids (HAAs). For this source water, the hydrophilic neutral fraction dominated over the other five fractions in being the main organic component and the most significant precursor of HAAs formation. On the other hand, in terms of specific HAA formation potential (FP), the hydrophobic and hydrophilic base fractions were the most reactive precursors to the formation of HAAs. In all cases, the quantity of HAAs formed depended linearly upon the amount of organic constituents in the water sample.
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Http Dx Doi Org 10 1080 10826068 2013 867871, Aug 8, 2014
Astaxanthin was induced from Haematococcus pluvialis (NIES-144) under indoor and outdoor conditio... more Astaxanthin was induced from Haematococcus pluvialis (NIES-144) under indoor and outdoor conditions using 17-, 50-, and 90-L flat-panel airlift photobioreactors (FP-APBRs). Preliminary experiments in 1.5-L bubble column photobioreactors (BC-PBRs) revealed that sterilized clean water with 3% CO2 aeration (1.47 cm(3) s(-1) CO2 loading) could best encourage astaxanthin accumulation at 18.21 g m(-3) (3.63% by weight). Operating 17-L FP-APBRs with these bubble column parameters under indoor conditions could further enhance astaxanthin to 26.63 g m(-3) (5.34% by weight). This was potentially due to the inherited up-lift force from the reactor that helped avoid cell precipitation by allowing the cells to be circulated within the reactor. In addition, the various sizes of FP-APBRs exhibited similar performance, implying a potential scale-up opportunity. However, similar operation under outdoor condition exhibited slightly poorer performance due to the light inhibition effect. The best outdoor performance was obtained with the FP-APBR covered with one layer of shading net, where 20.11 g m(-3) (4.47% by weight) of astaxanthin was resulted.
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Chemical Engineering Journal, Jul 1, 2008
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Chemical Engineering Journal, Oct 1, 2008
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Journal of Environmental Science and Health Part a, Aug 20, 2010
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Journal of Bioscience and Bioengineering, Nov 1, 2009
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Journal of Hazardous Materials, Dec 9, 2005
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Materials Chemistry and Physics, Dec 16, 2013
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Progr Biotechnol, 1996
This paper describes results from a novel technique developed for measuring the rate at which the... more This paper describes results from a novel technique developed for measuring the rate at which the thickness of biofilms growing attached to the surfaces of tubular membranes increase over time. Two biofilm/immobilised cell model systems have been studied; Xanthobacter autotrophicus GJ10 growing on 1,2-dichloroethane and Pseudomonas sp. strain JS150 growing on monochlorobenzene. A dynamic mathematical model has been developed to explain the experimental results, treating the expansion of the biofilm as a moving boundary problem. This model is able to predict accurately the rate of biofilm growth and the overall system performance.
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Chem Eng J, 2005
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Preparative Biochemistry and Biotechnology, 2015
Microalgae are promising feedstock for biofuel production. Lipid content in microalgae could be e... more Microalgae are promising feedstock for biofuel production. Lipid content in microalgae could be enhanced under nutrient depletion. This work investigated the effect of the nutrient on lipid accumulation in Ankistrodesmus sp. culture. Batch cultures were carried out using fresh BG11 medium, and after the harvest, the medium was reused for the next culture, and this method was repeated two times. The maximum lipid productivity of 29.75 mg L(-1) d(-1) was obtained from the culture with the 2nd reuse medium. In continuous cultures, Ankistrodesmus sp. was cultured in both fresh and modified BG11 mediums. The modified BG11 medium was adjusted to resemble the content of the 1st reuse medium. As a comparison between batch and continuous cultures, it was proven that the productivity in the continuous culture was better than the batch where the achievable maximum biomass and lipid were 188.30 and 38.32 mg L(-1) d(-1). The maximum lipid content of 34.22% was obtained from the continuous culture at the dilution rate of 0.08 d(-1), whereas the maximum saturated and unsaturated fatty acid productivities of 79.96 and 104.54 mg L(-1) d(-1) were obtained at the dilution rate of 0.16 d(-1.)
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In this study, a life cycle assessment (LCA) technique based on ISO 14040 series was performed to... more In this study, a life cycle assessment (LCA) technique based on ISO 14040 series was performed to evaluate biodiesel production from freshwater microalgae Scenedesmus armatus in terms of energy efficiency (Net Energy Ratio or NER) and environmental impact (Global Warming Potential or GWP). The system boundary covered the entire life cycle of microalgae-based biodiesel, which was divided into four distinct steps: cultivation, harvesting, oil extraction, and transesterification. Based on a functional unit of 1 MJ biodiesel, NER was found to be 0.34 and 0.19 for mass allocation and energy allocation, respectively. This energy deficit (NER< 1) for both allocation methods was due to the high energy input required to culture microalgae. However, CO2 uptake in biomass agriculture leads to better performance in global warming potential (GWP) when compared to conventional diesel and biodiesel produced from rapeseed and soybean. This is a result of the cultivation process in which microalg...
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Preparative Biochemistry and Biotechnology, 2015
The cultivation of Scenedesmus armatus was carried out under outdoor Thailand climate condition. ... more The cultivation of Scenedesmus armatus was carried out under outdoor Thailand climate condition. The highest actual growth rate occurred at around 9:00 AM to 3:00 PM with a wide pH range of 6.4 to 11. The supply of CO2 had slightly influence to growth characteristics but did exert some observable effects on nutritional accumulations. Adding CO2 from 2 to 15% by volume in the aeration (0.2 vvm) caused an increase in lipid and protein from 19.8 to 25.6 and 37.8 to 48.2% w/w, respectively, whereas carbohydrate decreased from 42.5 to 26.2% w/w. S. armatus cultivated with 2% CO2 enriched air provided the highest the average of the average biomass productivity of 91.25 mg L(-1)d(-1) which corresponded to a CO2 fixation of 165 mg CO2 L(-1)d(-1) with the average lipid, protein and carbohydrate productivities of 22.24, 38.34 and 30.67 mg L(-1)d(-1.)
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Engineering Journal, 2012
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Papers by Prasert Pavasant