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Acidogenic fermentation of industrial wastewaters: Effects of chemostat retention time and pH on volatile fatty acids production

Bengtsson, Simon LU ; Hallquist, Jakob; Werker, Alan and Welander, Thomas (2008) In Biochemical Engineering Journal 40(3). p.492-499
Abstract
Acidogenic fermentation of wastewater can serve as a first step in a process for mixed culture production of polyhydroxyalkanoates (PHA) since the produced volatile fatty acids (VFA) are preferred substrates for PHA production. Acidogenic fermentation of industrial wastewaters (cheese whey permeate and three pulp and paper mill effluents) was evaluated in batch and continuous experiments. From the batch experiments, it was found that for whey and one of the paper mill effluents nearly 100% of the soluble COD was readily fermentable. In continuous chemostat experiments with these two effluents, varying the retention time (RT) and pH of the reactors exhibited significant impact on the amount and composition of VFA produced. Increasing RT... (More)
Acidogenic fermentation of wastewater can serve as a first step in a process for mixed culture production of polyhydroxyalkanoates (PHA) since the produced volatile fatty acids (VFA) are preferred substrates for PHA production. Acidogenic fermentation of industrial wastewaters (cheese whey permeate and three pulp and paper mill effluents) was evaluated in batch and continuous experiments. From the batch experiments, it was found that for whey and one of the paper mill effluents nearly 100% of the soluble COD was readily fermentable. In continuous chemostat experiments with these two effluents, varying the retention time (RT) and pH of the reactors exhibited significant impact on the amount and composition of VFA produced. Increasing RT resulted in increased degrees of acidification up to a maximum of 0.93 g COD of VFA per g influent SCOD at RT 95 h for whey and 0.75 gCOD/gCOD at RT 24 h for the paper mill effluent. Main fermentation products were acetate, propionate and butyrate. Acetate production was rather insensitive to RT while above RT 10 h a shift from butyrate production to propionate production with increasing RT occurred for both effluents. Increasing pH from 5 to 6 resulted in increased amount of propionate. Based on these findings the possibility of regulating PHA monomer composition and associated polymer properties by controlling RT and pH during acidogenic pretreatment was discussed. (c) 2008 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
whey, paper mill wastewater, (VFA), volatile fatty acids, mixed culture, anaerobic, acidogenic fermentation
in
Biochemical Engineering Journal
volume
40
issue
3
pages
492 - 499
publisher
The Association for the Study of Animal Behaviour / Elsevier B.V.
external identifiers
  • wos:000257536600013
  • scopus:44449108001
ISSN
1369-703X
DOI
10.1016/j.bej.2008.02.004
language
English
LU publication?
yes
id
6ba1d7f6-1a9a-4127-bbf8-1b2bb5db8331 (old id 1255163)
date added to LUP
2008-10-17 13:50:04
date last changed
2017-11-05 04:13:58
@article{6ba1d7f6-1a9a-4127-bbf8-1b2bb5db8331,
  abstract     = {Acidogenic fermentation of wastewater can serve as a first step in a process for mixed culture production of polyhydroxyalkanoates (PHA) since the produced volatile fatty acids (VFA) are preferred substrates for PHA production. Acidogenic fermentation of industrial wastewaters (cheese whey permeate and three pulp and paper mill effluents) was evaluated in batch and continuous experiments. From the batch experiments, it was found that for whey and one of the paper mill effluents nearly 100% of the soluble COD was readily fermentable. In continuous chemostat experiments with these two effluents, varying the retention time (RT) and pH of the reactors exhibited significant impact on the amount and composition of VFA produced. Increasing RT resulted in increased degrees of acidification up to a maximum of 0.93 g COD of VFA per g influent SCOD at RT 95 h for whey and 0.75 gCOD/gCOD at RT 24 h for the paper mill effluent. Main fermentation products were acetate, propionate and butyrate. Acetate production was rather insensitive to RT while above RT 10 h a shift from butyrate production to propionate production with increasing RT occurred for both effluents. Increasing pH from 5 to 6 resulted in increased amount of propionate. Based on these findings the possibility of regulating PHA monomer composition and associated polymer properties by controlling RT and pH during acidogenic pretreatment was discussed. (c) 2008 Elsevier B.V. All rights reserved.},
  author       = {Bengtsson, Simon and Hallquist, Jakob and Werker, Alan and Welander, Thomas},
  issn         = {1369-703X},
  keyword      = {whey,paper mill wastewater,(VFA),volatile fatty acids,mixed culture,anaerobic,acidogenic fermentation},
  language     = {eng},
  number       = {3},
  pages        = {492--499},
  publisher    = {The Association for the Study of Animal Behaviour / Elsevier B.V.},
  series       = {Biochemical Engineering Journal},
  title        = {Acidogenic fermentation of industrial wastewaters: Effects of chemostat retention time and pH on volatile fatty acids production},
  url          = {http://dx.doi.org/10.1016/j.bej.2008.02.004},
  volume       = {40},
  year         = {2008},
}