Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 540674
Title Nutrient mineralization and organic matter reduction performance of RAS-based sludge in sequential UASB-EGSB reactors
Author(s) 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.
Source Aquacultural Engineering 83 (2018). - ISSN 0144-8609 - p. 10 - 19.
Department(s) Biobased Chemistry and Technology
Aquaculture and Fisheries
Biometris (PPO/PRI)
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Anaerobic digestion - Aquaculture sludge - Aquaponics - Biofertilizer - Nutrient recycling - Organic reduction - Phosphorus recovery - UASB

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.

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