Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors

Simon Goddek, Boris P.L. Delaide, Alyssa Joyce, Sven Wuertz, M.H. Jijakli, Amit Gross, Ep H. Eding, Ingo Bläser, Michael Reuter, L.C.P. Keizer, Rolf Morgenstern, Oliver Körner, Johan Verreth, Karel J. Keesman

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

There is a recognized need for mineralizing aquaculture-derived sludge in aquaponics systems in order to reduce waste production. Many recent studies of aquacultural waste treatment have focused only the production of biogas as opposed to the potential for mineralization of nutrient-rich sludge. Upflow anaerobic sludge blanket (UASB) reactors provide one possible solution for breaking down sludge into bioavailable nutrients that can subsequently be delivered to plants. As such, this study examines the mineralization performance of sequential UASB reactors that are designed with an expanded granular sludge bed (EGSB) and compared to standard aerobic and anaerobic batch reactors. Results of our experiments demonstrate that only chemical oxygen demand reduction is significantly different. An unexpected drop in pH of one of the three reactor systems revealed that a pH below 6 was able to significantly increase the mineralization and mobilization of nutrients. Approximately 25% of phosphorus, potassium, and calcium could also be recovered from the sludge under lower pH conditions, as compared to the mineralization performance of standard UASB reactors running at a higher pH. However, the opposite effect was observed with respect to organic sludge reduction, where diminished performance was observed in the low-pH reactor. The current study implies that anaerobic reactors operating at low pH can potentially contribute towards improved nutrient recovery in multi-loop aquaponics systems and reduction of additive agents for pH control of the hydroponic subsystem.

LanguageEnglish
Pages10-19
JournalAquacultural Engineering
Volume83
DOIs
Publication statusPublished - 1 Nov 2018

Fingerprint

sludge
mineralization
organic matter
upflow anaerobic sludge blanket reactor
nutrient
nutrients
aquaponics
waste treatment
chemical oxygen demand
biogas
reactor
hydroponics
aquaculture
potassium
mobilization
calcium
phosphorus

Keywords

  • Anaerobic digestion
  • Aquaculture sludge
  • Aquaponics
  • Biofertilizer
  • Nutrient recycling
  • Organic reduction
  • Phosphorus recovery
  • UASB

Cite this

Goddek, Simon ; Delaide, Boris P.L. ; Joyce, Alyssa ; Wuertz, Sven ; Jijakli, M.H. ; Gross, Amit ; Eding, Ep H. ; Bläser, Ingo ; Reuter, Michael ; Keizer, L.C.P. ; Morgenstern, Rolf ; Körner, Oliver ; Verreth, Johan ; Keesman, Karel J. / Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors. In: Aquacultural Engineering. 2018 ; Vol. 83. pp. 10-19.
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Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors. / Goddek, Simon; Delaide, Boris P.L.; Joyce, Alyssa; Wuertz, Sven; Jijakli, M.H.; Gross, Amit; Eding, Ep H.; Bläser, Ingo; Reuter, Michael; Keizer, L.C.P.; Morgenstern, Rolf; Körner, Oliver; Verreth, Johan; Keesman, Karel J.

In: Aquacultural Engineering, Vol. 83, 01.11.2018, p. 10-19.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Goddek, Simon

AU - Delaide, Boris P.L.

AU - Joyce, Alyssa

AU - Wuertz, Sven

AU - Jijakli, M.H.

AU - Gross, Amit

AU - Eding, Ep H.

AU - Bläser, Ingo

AU - Reuter, Michael

AU - Keizer, L.C.P.

AU - Morgenstern, Rolf

AU - Körner, Oliver

AU - Verreth, Johan

AU - Keesman, Karel J.

PY - 2018/11/1

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N2 - There is a recognized need for mineralizing aquaculture-derived sludge in aquaponics systems in order to reduce waste production. Many recent studies of aquacultural waste treatment have focused only the production of biogas as opposed to the potential for mineralization of nutrient-rich sludge. Upflow anaerobic sludge blanket (UASB) reactors provide one possible solution for breaking down sludge into bioavailable nutrients that can subsequently be delivered to plants. As such, this study examines the mineralization performance of sequential UASB reactors that are designed with an expanded granular sludge bed (EGSB) and compared to standard aerobic and anaerobic batch reactors. Results of our experiments demonstrate that only chemical oxygen demand reduction is significantly different. An unexpected drop in pH of one of the three reactor systems revealed that a pH below 6 was able to significantly increase the mineralization and mobilization of nutrients. Approximately 25% of phosphorus, potassium, and calcium could also be recovered from the sludge under lower pH conditions, as compared to the mineralization performance of standard UASB reactors running at a higher pH. However, the opposite effect was observed with respect to organic sludge reduction, where diminished performance was observed in the low-pH reactor. The current study implies that anaerobic reactors operating at low pH can potentially contribute towards improved nutrient recovery in multi-loop aquaponics systems and reduction of additive agents for pH control of the hydroponic subsystem.

AB - There is a recognized need for mineralizing aquaculture-derived sludge in aquaponics systems in order to reduce waste production. Many recent studies of aquacultural waste treatment have focused only the production of biogas as opposed to the potential for mineralization of nutrient-rich sludge. Upflow anaerobic sludge blanket (UASB) reactors provide one possible solution for breaking down sludge into bioavailable nutrients that can subsequently be delivered to plants. As such, this study examines the mineralization performance of sequential UASB reactors that are designed with an expanded granular sludge bed (EGSB) and compared to standard aerobic and anaerobic batch reactors. Results of our experiments demonstrate that only chemical oxygen demand reduction is significantly different. An unexpected drop in pH of one of the three reactor systems revealed that a pH below 6 was able to significantly increase the mineralization and mobilization of nutrients. Approximately 25% of phosphorus, potassium, and calcium could also be recovered from the sludge under lower pH conditions, as compared to the mineralization performance of standard UASB reactors running at a higher pH. However, the opposite effect was observed with respect to organic sludge reduction, where diminished performance was observed in the low-pH reactor. The current study implies that anaerobic reactors operating at low pH can potentially contribute towards improved nutrient recovery in multi-loop aquaponics systems and reduction of additive agents for pH control of the hydroponic subsystem.

KW - Anaerobic digestion

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KW - Aquaponics

KW - Biofertilizer

KW - Nutrient recycling

KW - Organic reduction

KW - Phosphorus recovery

KW - UASB

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T2 - Aquacultural Engineering

JF - Aquacultural Engineering

SN - 0144-8609

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