A novel anammox reactor with a nitrogen gas circulation: performance, granule size, activity, and microbial community

Chen, Wenjing; Chen, Shengdong; Hu, Fan; Liu, Wenru; Yang, Dianhai; Wu, Jun

doi:10.1007/s11356-020-08432-w

Cited by 25 publications

(3 citation statements)

References 43 publications

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“…The presence of complete pathways for denitrification and nitrification indicates potential for these habitats to sustain levels of nitrite and ammonium that would enable the anammox reaction [ 22 ]. Additionally, wastewater treatment facilities represent systems that contain high concentrations of nitrate, nitrite, and ammonium, yet anammox bacteria are not typically naturally present [ 44 , 45 ]. Instead, they are added to these systems, typically within a bioreactor that provides sufficiently low reduction potential to support the growth of these bacteria [ 46 – 49 ].…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, Tal et al (2006), reported successful anammox activity in fixed film biofilters within marine aquaculture systems [ 49 ]. These biofilters are structurally and functionally similar to the anammox bioreactors used in wastewater treatment plants [ 45 – 49 ] and represent a path forward for application of analogous systems in commercial aquaria.…”

Section: Discussionmentioning

confidence: 99%

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Microbiomes and Planctomycete diversity in large-scale aquaria habitats

et al. 2022

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In commercial large-scale aquaria, controlling levels of nitrogenous compounds is essential for macrofauna health. Naturally occurring bacteria are capable of transforming toxic nitrogen species into their more benign counterparts and play important roles in maintaining aquaria health. Nitrification, the microbially-mediated transformation of ammonium and nitrite to nitrate, is a common and encouraged process for management of both commercial and home aquaria. A potentially competing microbial process that transforms ammonium and nitrite to dinitrogen gas (anaerobic ammonium oxidation [anammox]) is mediated by some bacteria within the phylum Planctomycetes. Anammox has been harnessed for nitrogen removal during wastewater treatment, as the nitrogenous end product is released into the atmosphere rather than in aqueous discharge. Whether anammox bacteria could be similarly utilized in commercial aquaria is an open question. As a first step in assessing the viability of this practice, we (i) characterized microbial communities from water and sand filtration systems for four habitats at the Tennessee Aquarium and (ii) examined the abundance and anammox potential of Planctomycetes using culture-independent approaches. 16S rRNA gene amplicon sequencing revealed distinct, yet stable, microbial communities and the presence of Planctomycetes (~1–15% of library reads) in all sampled habitats. Preliminary metagenomic analyses identified the genetic potential for multiple complete nitrogen metabolism pathways. However, no known genes diagnostic for the anammox reaction were found in this survey. To better understand the diversity of this group of bacteria in these systems, a targeted Planctomycete-specific 16S rRNA gene-based PCR approach was used. This effort recovered amplicons that share <95% 16S rRNA gene sequence identity to previously characterized Planctomycetes, suggesting novel strains within this phylum reside within aquaria.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Microbiomes and Planctomycete diversity in large-scale aquaria habitats

et al. 2022

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“…Among the full-scale ANAMMOX-mediated systems, the sequencing batch reactor (SBR) configuration is the most popular, owing to its excellent biomass retention efficiency, homogeneous substrate distribution, simplicity, and flexibility of operations. , In suspended-growth systems, AOB mainly grows in the flocculent biomass, while the AMX mostly grow in the granular biomass. − The proportion of flocculent biomass and granular biomass in the SBRs could depend on the duration of settling phases and the intensity of mixing …”

Section: Biomass Retention Strategies In Anammox-mediated Systemsmentioning

confidence: 99%

Critical Analysis of Biomass Retention Strategies in Mainstream and Sidestream ANAMMOX-Mediated Nitrogen Removal Systems

Kosgey

Chandran

Gokal

et al. 2020

Environ. Sci. Technol.

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ANAMMOX (anaerobic ammonium oxidation) represents an energy-efficient process for biological nitrogen removal, particularly from wastewater streams with low chemical oxygen demand (COD) to nitrogen (C/N) ratios. Its widespread application, however, is still hampered by a lack of access to biomass-enriched with ANAMMOX bacteria (AMX), slow growth rates of AMX, and their sensitivity to inhibition. Although the coupling of ANAMMOX processes with partial nitrification is already widespread, especially for sidestream treatment, maintaining a functional population density of AMX remains a challenge in these systems. Therefore, strategies that maximize retention of AMX-rich biomass are essential to promote process stability. This paper reviews existing methods of biomass retention in ANAMMOX-mediated systems, focusing on (i) granulation; (ii) biofilm formation on carrier materials; (iii) gel entrapment; and (iv) membrane technology in mainstream and sidestream systems. In addition, the microbial ecology of different ANAMMOX-mediated systems is reviewed.

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