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Taghavijeloudar, Mohsen,Park, Junboum,Hashemi, Shervin,Han, Mooyoung Elsevier 2019 Bioresource technology Vol.273 No.-
<P><B>Abstract</B></P> <P>The application of pressure filtration in microalgae harvesting requires chemical pretreatment in order to reduce membrane fouling and to increase water flux. Surfactants have shown potential to enhance microalgae dewaterability by charge neutralization, bridging and releasing extracellular polymeric substances (EPS) and bound water. In this study, the effect of three surfactants including anionic sodium dodecyl sulfate (SDS), non-ionic triton X-100 and cationic cetyl trimethyl ammonium bromide (CTAB) on the dewaterability of <I>Chlamydomonas</I> sp. was investigated. Filtration fluxes and biomass concentrations were used to evaluate the microalgae dewaterability. Based on the results, SDS and Triton X-100 had a negative effect on the dewaterability of microalgae biomass. However, CTAB improved the dewaterability by decreasing the reversible and irreversible fouling resistance. The optimum dosage of CTAB was found to be 1500 mg/L, and resulted in 95.8% and 140% improvement on average water flux and biomass recovery efficiency, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of surfactant on the dewaterability of microalgae was investigated. </LI> <LI> Dose of SDS and Triton X-100 caused a significant deterioration in dewaterability. </LI> <LI> CTAB is found as suitable pretreatment to improve microalgae dewaterability. </LI> <LI> 140% biomass recovery efficiency is obtained. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Amarbayar Jugdernamjil,박준범(Junboum Park) 한국토목섬유학회 2012 한국지반신소재학회 학술발표회 Vol.2012 No.4
The purpose of this survey is to investigate the current status of metal pollution of the soil in Ulaanbaatar, the capital city of Mongolia. During the last decade, the city has been rapidly urbanized. The most soil erosion occurs in gher districts of Ulaanbaatar city. It was recently found that the arsenic(As) concentration in the soil was higher than the guideline value and the lead (Pb) content in some samples was higher than normal. The source of As pollution appears to be the coal combustion in three power plants in the city. The sources of the increase in Pb pollution might be the remarkable increase in the number of used vehicles and the increase in the use of leaded fuel in the last few years. Additionally, the concentration of heavy metals in the urban soils of Ulaanbaatar was compared with the mean values of the heavy-metal concentrations in the soils of other countries; the comparison results will shown this study.