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Evaluating 5 and 8 pH-point titrations for measuring VFA in full-scale primary sludge hydrolysate

Hey, T.; Sandstrom, D.; Ibrahim, V. and Jönsson, Karin LU (2013) In Water S.A. 39(1). p.17-22
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Multiple pH-point titration, volatile fatty acids, wastewater, full-scale, primary sludge hydrolysis
in
Water S.A.
volume
39
issue
1
pages
17 - 22
publisher
Water Research Commission
external identifiers
  • wos:000316185500003
  • scopus:84873038272
ISSN
1816-7950
DOI
10.4314/wsa.v39i1.3
language
English
LU publication?
yes
id
dd54b2e9-159e-4673-95bf-ab71d3d6cd4c (old id 3651187)
date added to LUP
2013-04-24 15:48:27
date last changed
2019-07-02 01:27:12
@article{dd54b2e9-159e-4673-95bf-ab71d3d6cd4c,
  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.},
  author       = {Hey, T. and Sandstrom, D. and Ibrahim, V. and Jönsson, Karin},
  issn         = {1816-7950},
  keyword      = {Multiple pH-point titration,volatile fatty acids,wastewater,full-scale,primary sludge hydrolysis},
  language     = {eng},
  number       = {1},
  pages        = {17--22},
  publisher    = {Water Research Commission},
  series       = {Water S.A.},
  title        = {Evaluating 5 and 8 pH-point titrations for measuring VFA in full-scale primary sludge hydrolysate},
  url          = {http://dx.doi.org/10.4314/wsa.v39i1.3},
  volume       = {39},
  year         = {2013},
}