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Hydrolysis of return sludge for production of easily biodegradable carbon: effect of pre-treatment, sludge age and temperature

Jönsson, Karin LU and la Cour Jansen, Jes LU (2006) In Water Science and Technology 53(12). p.47-54
Abstract
Return sludge from two Swedish and two Danish wastewater treatment plants were hydrolysed in laboratory reactors. Treatment plants with/without pre-sedimentation and with/without nitrification were represented. Soluble organic matter was produced from all types of sludge, but the yield was to a large extent dependent on what type of sludge was hydrolysed. Activated sludge from wastewater treatment plants without pre-treatment returned more soluble carbon after hydrolysis than sludge from treatment plants with pre-sedimentation. In addition, more soluble carbon was formed from non-nitrifying activated sludge than from nitrifying sludge. Moreover, the maximum yield of soluble COD at 10 degrees C was less than the yield at 20 degrees C. The... (More)
Return sludge from two Swedish and two Danish wastewater treatment plants were hydrolysed in laboratory reactors. Treatment plants with/without pre-sedimentation and with/without nitrification were represented. Soluble organic matter was produced from all types of sludge, but the yield was to a large extent dependent on what type of sludge was hydrolysed. Activated sludge from wastewater treatment plants without pre-treatment returned more soluble carbon after hydrolysis than sludge from treatment plants with pre-sedimentation. In addition, more soluble carbon was formed from non-nitrifying activated sludge than from nitrifying sludge. Moreover, the maximum yield of soluble COD at 10 degrees C was less than the yield at 20 degrees C. The initial hydrolysis rate was found to be between 0.35 and 1.8 mg soluble COD/(g VS x h). With the exception of one case, between 15 and 50% of the produced soluble COD was shown to be volatile fatty acids, a suitable carbon source for biological phosphorus removal. Nitrification rate measurements indicated that the viability of the activated sludge was not affected by the hydrolysis. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
return sludge, activated sludge, hydrolysis, soluble COD
in
Water Science and Technology
volume
53
issue
12
pages
47 - 54
publisher
IWA Publishing
external identifiers
  • wos:000239543700006
  • scopus:33746522349
ISSN
0273-1223
DOI
10.2166/wst.2006.405
language
English
LU publication?
yes
id
1372571c-cbb6-4127-9215-9d0e63747fc3 (old id 398595)
date added to LUP
2007-10-07 12:01:51
date last changed
2019-09-17 03:14:50
@article{1372571c-cbb6-4127-9215-9d0e63747fc3,
  abstract     = {Return sludge from two Swedish and two Danish wastewater treatment plants were hydrolysed in laboratory reactors. Treatment plants with/without pre-sedimentation and with/without nitrification were represented. Soluble organic matter was produced from all types of sludge, but the yield was to a large extent dependent on what type of sludge was hydrolysed. Activated sludge from wastewater treatment plants without pre-treatment returned more soluble carbon after hydrolysis than sludge from treatment plants with pre-sedimentation. In addition, more soluble carbon was formed from non-nitrifying activated sludge than from nitrifying sludge. Moreover, the maximum yield of soluble COD at 10 degrees C was less than the yield at 20 degrees C. The initial hydrolysis rate was found to be between 0.35 and 1.8 mg soluble COD/(g VS x h). With the exception of one case, between 15 and 50% of the produced soluble COD was shown to be volatile fatty acids, a suitable carbon source for biological phosphorus removal. Nitrification rate measurements indicated that the viability of the activated sludge was not affected by the hydrolysis.},
  author       = {Jönsson, Karin and la Cour Jansen, Jes},
  issn         = {0273-1223},
  keyword      = {return sludge,activated sludge,hydrolysis,soluble COD},
  language     = {eng},
  number       = {12},
  pages        = {47--54},
  publisher    = {IWA Publishing},
  series       = {Water Science and Technology},
  title        = {Hydrolysis of return sludge for production of easily biodegradable carbon: effect of pre-treatment, sludge age and temperature},
  url          = {http://dx.doi.org/10.2166/wst.2006.405},
  volume       = {53},
  year         = {2006},
}