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Influence of recirculation flow rate on the performance of anaerobic packed-bed bioreactors treating potato-waste leachate

Mshandete, Anthony LU ; Murto, Marika LU ; Kivaisi, A K; Rubinsamayugi, M S T and Mattiasson, Bo LU (2004) In Environmental Technology 25(8). p.929-936
Abstract
The performance of anaerobic, packed-bed bioreactors treating leachate from potato waste was evaluated in terms of organic loading rate (OLR) as well as the recirculation flow rate. Two 1 litre bioreactors, filled with porous glass beads as biofilm carriers and with continuous recirculation flow rates of 10 ml min(-1) and 20 ml min(-1) respectively, were used in the experiment. The OLR applied to each bioreactor was increased stepwise from 4 to 12 kg chemical oxygen demand (COD) m(-3)d(-1) by increasing feed flow rate. The methane yields decreased with increasing OLR in both bioreactors. The methane yield for the bioreactor with the lower recirculation flow rate ranged between 0.10 and 0.14 m(3) CH4 kg COD-1 removed, while for the other... (More)
The performance of anaerobic, packed-bed bioreactors treating leachate from potato waste was evaluated in terms of organic loading rate (OLR) as well as the recirculation flow rate. Two 1 litre bioreactors, filled with porous glass beads as biofilm carriers and with continuous recirculation flow rates of 10 ml min(-1) and 20 ml min(-1) respectively, were used in the experiment. The OLR applied to each bioreactor was increased stepwise from 4 to 12 kg chemical oxygen demand (COD) m(-3)d(-1) by increasing feed flow rate. The methane yields decreased with increasing OLR in both bioreactors. The methane yield for the bioreactor with the lower recirculation flow rate ranged between 0.10 and 0.14 m(3) CH4 kg COD-1 removed, while for the other bioreactor it was 0.14-0.20 m(3) CH4 kg COD-1 removed. Both bioreactors demonstrated stable COD removal which was around 95% for the bioreactor with lower flow of recirculation while for the other it was 92%, over a range of OLRs of 4-8 kg COD m(-3)d(-1). The bioreactor with the lower recirculation flow rate showed operational stability when a high OLR, namely 12 kg COD m(-3)d(-1), was applied, while the other one became overloaded. There was an accumulation of volatile fatty acids which gave a corresponding drop in pH because the system had a low buffering capacity and this thus ultimately led to process failure. This study demonstrated the suitability of a packed bed bioreactor operated at lower recirculation flow rate for treating leachate from potato waste. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Technology
volume
25
issue
8
pages
929 - 936
publisher
Selper Ltd
external identifiers
  • pmid:15366560
  • wos:000223974100009
  • scopus:4544274028
ISSN
1479-487X
language
English
LU publication?
yes
id
78c7e6d6-f6db-4273-93ea-bbac13c953ac (old id 140573)
alternative location
http://www.ingentaconnect.com/content/selp/envt/2004/00000025/00000008/art00009
date added to LUP
2007-07-02 14:01:25
date last changed
2017-01-01 05:01:54
@article{78c7e6d6-f6db-4273-93ea-bbac13c953ac,
  abstract     = {The performance of anaerobic, packed-bed bioreactors treating leachate from potato waste was evaluated in terms of organic loading rate (OLR) as well as the recirculation flow rate. Two 1 litre bioreactors, filled with porous glass beads as biofilm carriers and with continuous recirculation flow rates of 10 ml min(-1) and 20 ml min(-1) respectively, were used in the experiment. The OLR applied to each bioreactor was increased stepwise from 4 to 12 kg chemical oxygen demand (COD) m(-3)d(-1) by increasing feed flow rate. The methane yields decreased with increasing OLR in both bioreactors. The methane yield for the bioreactor with the lower recirculation flow rate ranged between 0.10 and 0.14 m(3) CH4 kg COD-1 removed, while for the other bioreactor it was 0.14-0.20 m(3) CH4 kg COD-1 removed. Both bioreactors demonstrated stable COD removal which was around 95% for the bioreactor with lower flow of recirculation while for the other it was 92%, over a range of OLRs of 4-8 kg COD m(-3)d(-1). The bioreactor with the lower recirculation flow rate showed operational stability when a high OLR, namely 12 kg COD m(-3)d(-1), was applied, while the other one became overloaded. There was an accumulation of volatile fatty acids which gave a corresponding drop in pH because the system had a low buffering capacity and this thus ultimately led to process failure. This study demonstrated the suitability of a packed bed bioreactor operated at lower recirculation flow rate for treating leachate from potato waste.},
  author       = {Mshandete, Anthony and Murto, Marika and Kivaisi, A K and Rubinsamayugi, M S T and Mattiasson, Bo},
  issn         = {1479-487X},
  language     = {eng},
  number       = {8},
  pages        = {929--936},
  publisher    = {Selper Ltd},
  series       = {Environmental Technology},
  title        = {Influence of recirculation flow rate on the performance of anaerobic packed-bed bioreactors treating potato-waste leachate},
  volume       = {25},
  year         = {2004},
}