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Mainstream-sidestream wastewater switching promotes anammox nitrogen removal rate in organic-rich, low-temperature streams

Zekker, Ivar ; Raudkivi, Markus ; Artemchuk, Oleg ; Rikmann, Ergo ; Priks, Hans ; Jaagura, Madis ; Tenno, Taavo

Environmental technology, 2021-08, Vol.42 (19), p.3073-3082 [Periódico revisado por pares]

England: Taylor & Francis

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  • Título:
    Mainstream-sidestream wastewater switching promotes anammox nitrogen removal rate in organic-rich, low-temperature streams
  • Autor: Zekker, Ivar ; Raudkivi, Markus ; Artemchuk, Oleg ; Rikmann, Ergo ; Priks, Hans ; Jaagura, Madis ; Tenno, Taavo
  • Assuntos: Ammonia-oxidizing bacteria ; Bacteria ; biofilm ; Biofilms ; Biogas ; Biomass ; Bioreactors ; Chemical oxygen demand ; denitrification ; hydrazine ; Low temperature ; Municipal wastewater ; Nitrogen removal ; oxidation-reduction potential ; Reactors ; Specific anammox activity ; Switching ; Wastewater
  • É parte de: Environmental technology, 2021-08, Vol.42 (19), p.3073-3082
  • Descrição: The main issues with mainstream anammox application are loss of bacterial activity by low temperatures and by a high organic content of wastewater. We demonstrate a novel switching method between sidestream and mainstream wastewater. The wastewater flow was switched between sidestream (reject water at >22°C) and mainstream (municipal wastewater at 16.5°C), so that the anammox biomass activity and biomass growth could benefit from sidestream conditions. Real sidestream wastewater (biogas plant effluent) (≈1000 mg NH + 4 -N L −1 ) and synthetic mainstream (municipal wastewater-like source) (≈100 mg NH + 4 -N) wastewater were used for 20 L biofilm reactor feeding. The highest total nitrogen removal rate (TNRR) of 527 g N m −3  d −1 (average TNRR 180 (±140) g N m −3  d −1 ) was achieved with sidestream wastewater at a low chemical oxygen demand (COD)/TN ratio of 1.1/1. For reactor feeding with mainstream, the highest TNRR achieved was 61 g N m −3  d −1 . Average TNRR for mainstream of 20 (±15) g N m −3  d −1 was low due to a higher COD/N ratio of 3.2/1. The highest TNRR in a batch test was achieved at the COD concentration of 480 mg L −1 , reflecting a TNRR of ≈5 mg N g −1 TSS h −1 . With a high COD concentration of 2600 mg L −1 (TOC/TN = 8/1), TNRR decreased similarly in both feeds to 1.6 mg N g −1 TSS h −1 . The anammox microorganism's genus Candidatus Brocadia enrichment in deammonification biofilm reactor was higher in the mainstream operation (7.6% of all bacteria) than in sidestream operation period (<0.7% of all bacteria).
  • Editor: England: Taylor & Francis
  • Idioma: Inglês;Francês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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