Nascent application of aerobic granular sludge for recirculating aquaculture system effluent treatment : Performance, granule formation, and microbial community

Talvikki Suhonen, Raed A. Al-Juboori, Antonina Kruglova, Jani Pulkkinen, Jouni Vielma, Anna Mikola*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
26 Downloads (Pure)

Abstract

This study presents for the first time an evaluation of the feasibility of aerobic granular sludge (AGS) for treating recirculating aquaculture system (RAS) effluent in a sequential batch reactor configuration for nutrient removal. An AGS process was started using synthetic wastewater to grow the granules, and the feed was then switched to RAS effluent, and a systematically decreasing carbon supplementation was applied. Total nitrogen removal significantly decreased from around 75 % to as low as 13 %, but granules could restore their performance when allowed enough time (2 weeks) to acclimate to the change in feed. The dynamics of AGS microbial communities were followed by Illumina sequencing. A high abundance of microbial populations—indicating dense and stable granules—was observed after 97 days of operation with RAS wastewater. In particular, the genera Neomegalonema, Hydrogenophaga, Thauera, Bdellovibrio, Flavobacterium, and Pseudomonas represented most of the community, showing the heterotrophic, denitrifying, and phosphorus-accumulating potential of the studied operational design. The AGS showed promising results for a small-footprint solution for RAS treatment, but the energy consumption of aeration and carbon addition still requires further development.

Original languageEnglish
Article number102361
Number of pages10
JournalAquacultural Engineering
Volume103
DOIs
Publication statusPublished - Nov 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Aerobic granular sludge
  • Microbial community
  • Nitrogen removal
  • Recirculating aquaculture system

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