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Enhancing anaerobic digestion in urban wastewater management

Kjerstadius, Hamse LU (2017)
Abstract
The thesis investigates how anaerobic digestion could be utilized to improve wastewater management,
specifically in regards to future expected regulation on sludge management in Sweden.
Two possible paths of applying anaerobic digestion are investigated. First, the usage of thermophilic anaerobic
digestion of sludge in order to achieve pathogen hygienization. Second, the usage of anaerobic digestion to
treat wastewaters at decreased temperature. The evaluation of each path was made through practical lab
scale experiments. Additionally, the benefits of each path was compared through desk top environmental
impact studies and economic analysis.
The results for the first path showed that thermophilic anaerobic... (More)
The thesis investigates how anaerobic digestion could be utilized to improve wastewater management,
specifically in regards to future expected regulation on sludge management in Sweden.
Two possible paths of applying anaerobic digestion are investigated. First, the usage of thermophilic anaerobic
digestion of sludge in order to achieve pathogen hygienization. Second, the usage of anaerobic digestion to
treat wastewaters at decreased temperature. The evaluation of each path was made through practical lab
scale experiments. Additionally, the benefits of each path was compared through desk top environmental
impact studies and economic analysis.
The results for the first path showed that thermophilic anaerobic digestion renders high pathogen hygienization
even at relative short exposure times. However no additional beneficial impact on biogas production or the
reduction of organic micropollutants was found. The results for the second path showed that the difficulty of
operating the sensitive anaerobic digestion process at low temperatures can be partly overcome by simple
engineering batch tests. Furthermore, the dissolved methane in the effluent wastewaters can be extracted
using membrane contactors. Finally, the environmental impact assessment showed that increased resource
recovery from wastewater, as well as decreased climate impact, can be achieved by applying anaerobic
digestion on source separated domestic wastewaster.
The economic evaluation of the two paths showed that the implementation of source separation systems is
expensive compared to implementing the needed thermophilic hygienization. However, source separation
systems would greatly boost nutrient recovery from cities to agriculture which complies well with the goals of
the Swedish Environmental Protection Agency. (Less)
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author
supervisor
opponent
  • Professor Zeeman, Grietje, Wageningen University, the Netherlands
organization
publishing date
type
Thesis
publication status
published
subject
pages
155 pages
publisher
Department of Chemical Engineering, Lund University
defense location
lecture hall KC:B, at Kemicentrum, Naturvetarvägen 14, Lund University, Faculty of Engineering LTH, Lund
defense date
2017-03-31 09:00
ISBN
978-91-7422-504-4
978-91-7422-503-7
language
English
LU publication?
yes
id
5557e275-92ef-4e03-95d0-b63aed20cd1d
date added to LUP
2017-03-02 16:16:35
date last changed
2017-03-08 07:54:13
@phdthesis{5557e275-92ef-4e03-95d0-b63aed20cd1d,
  abstract     = {The thesis investigates how anaerobic digestion could be utilized to improve wastewater management,<br/>specifically in regards to future expected regulation on sludge management in Sweden.<br/>Two possible paths of applying anaerobic digestion are investigated. First, the usage of thermophilic anaerobic<br/>digestion of sludge in order to achieve pathogen hygienization. Second, the usage of anaerobic digestion to<br/>treat wastewaters at decreased temperature. The evaluation of each path was made through practical lab<br/>scale experiments. Additionally, the benefits of each path was compared through desk top environmental<br/>impact studies and economic analysis.<br/>The results for the first path showed that thermophilic anaerobic digestion renders high pathogen hygienization<br/>even at relative short exposure times. However no additional beneficial impact on biogas production or the<br/>reduction of organic micropollutants was found. The results for the second path showed that the difficulty of<br/>operating the sensitive anaerobic digestion process at low temperatures can be partly overcome by simple<br/>engineering batch tests. Furthermore, the dissolved methane in the effluent wastewaters can be extracted<br/>using membrane contactors. Finally, the environmental impact assessment showed that increased resource<br/>recovery from wastewater, as well as decreased climate impact, can be achieved by applying anaerobic<br/>digestion on source separated domestic wastewaster.<br/>The economic evaluation of the two paths showed that the implementation of source separation systems is<br/>expensive compared to implementing the needed thermophilic hygienization. However, source separation<br/>systems would greatly boost nutrient recovery from cities to agriculture which complies well with the goals of<br/>the Swedish Environmental Protection Agency.},
  author       = {Kjerstadius, Hamse},
  isbn         = {978-91-7422-504-4},
  language     = {eng},
  month        = {03},
  pages        = {155},
  publisher    = {Department of Chemical Engineering, Lund University},
  school       = {Lund University},
  title        = {Enhancing anaerobic digestion in urban wastewater management},
  year         = {2017},
}