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Träfflista för sökning "WFRF:(Sandstrom Karin) srt2:(2013)"

Sökning: WFRF:(Sandstrom Karin) > (2013)

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1.
  • Hey, T., et al. (författare)
  • Evaluating 5 and 8 pH-point titrations for measuring VFA in full-scale primary sludge hydrolysate
  • 2013
  • Ingår i: Water S.A.. - : Academy of Science of South Africa. - 1816-7950 .- 0378-4738. ; 39:1, s. 17-22
  • Tidskriftsartikel (refereegranskat)abstract
    • An evaluation of 5 and 8 pH-point titrimetric methods for determining volatile fatty acids (VFAs) was conducted, and the results were compared for tap water and primary treated wastewater at the laboratory scale. These techniques were then applied to full-scale primary sludge hydrolysate, and the results were compared with those obtained via gas chromatography. The comparison showed that the VFA concentrations measured with the two titration methods were higher than those obtained via gas chromatography, differing by 9 and 13 mg COD.l(-1) for the hydrolysate and by 5 and 6 mg COD.l(-1) for the ordinary primary settler effluent. No improvement in the accuracy of VFA concentration measurement was obtained from applying the 8 pH-point titration method instead of the 5 point method. The 5 pH-point method was successfully applied to determine VFA in full-scale primary sludge hydrolysate and was shown to be equally efficient to the methods that are routinely-used for this purpose.
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2.
  • Meixner, Margaret, et al. (författare)
  • Herschel and ALMA measurements of dust and molecules in supernova 1987A
  • 2013
  • Ingår i: Proceedings of Science. - 1824-8039. ; Part F113823
  • Konferensbidrag (refereegranskat)abstract
    • Dust production by supernovae is important in the dust life cycle of a galaxy. The explosion of SN 1987A was the nearest SN detected in the last 400 years, allowing us detailed studies of contemporary evolution of a supernova for the first time. In 2011, Matsuura et al. reported 0.4-0.7 M of dust in SN 1987A based on Herschel HERITAGE survey data, which is surprisingly large compared to prior measurements of supernovae. In this paper, we present our follow-up studies of this important discovery about SN 1987A using the Herschel Space Observatory and the Atacama Large Millimeter Array (ALMA). We highlight two important results, the detection of cold molecular gas and dust in the ejected material of SN 1987A. Our results suggest that SNe are significant producers of dust and molecules, as well as heavy elements, driving chemical evolution of galaxies.
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