Fast start-up of the single-stage nitrogen removal using anammox and partial nitritation (SNAP) from conventional activated sludge in a membrane-aerated biofilm reactor

Augusto, Matheus Ribeiro; Camiloti, Priscila Rosseto; Souza, Theo Syrto Octavio de

doi:10.1016/j.biortech.2018.06.068

Cited by 82 publications

(27 citation statements)

References 46 publications

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“…Startup times of ∼30 days with activated sludge and ∼20 days with PN/A sludge were achieved to reach ammonium removal rates above 80%, and this is consistent with other studies ( Augusto et al., 2018 ). Using real municipal wastewater resulted in fluctuations of the feed composition.…”

Section: Resultssupporting

confidence: 92%

“…(2007) showed that partial nitritation is achievable using MABR under suitable conditions (limited oxygen availability, elevated temperature and pH, appropriate initial alkalinity) with high strength artificial wastewater (250 and 510 mg–NH 4 –N L −1 ). Achieving nitrogen removal via PN/A using an MABR system inoculated with conventional activated sludge and charged with low strength synthetic wastewater (50 and 100 mg–NH 4 –N L −1 ) is possible, as reported by Augusto et al. (2018) .…”

Section: Introductionmentioning

confidence: 78%

“…MABRs 1 and 2 were operated with a constant HRT (∼0.5 days) for the first 183 days similar to previous studies that also worked with constant feed flow rates ( Augusto et al., 2018 ; Gilmore et al., 2013 ; Hibiya et al., 2003 ; Wei et al., 2012 ), but also with constant influent concentrations. In our case, the ammonium (1.6–6 g–NH 4 –N m −2 d −1 ) and sCOD (1.9–13.3 g-O 2 m −2 d −1 ) surface load varied, depending on the composition of the municipal wastewater.…”

Section: Resultsmentioning

confidence: 99%

“…This resulted in low TN removal (MABR 1: 11–31%, MABR 2: 8–30%) as summarized in Table 2 . Due to the low TN removal, the feeding strategy was changed to constant surface loads, similar to most previous MABR studies all of which worked with synthetic feed with constant inflow and stable concentrations ( Augusto et al., 2018 ; Ma, 2018 ; Wei et al., 2012 ).…”

Section: Resultsmentioning

confidence: 99%

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Membrane aerated biofilm reactors for mainstream partial nitritation/anammox: Experiences using real municipal wastewater

et al. 2020

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This study investigated the potential of Membrane-Aerated Biofilm Reactors (MABRs) for mainstream nitrogen removal via partial nitration/anaerobic ammonium oxidation (anammox). Four laboratory-scale MABRs were operated with real municipal wastewater characterized by low concentrations of nitrogen (varying between 31 and 120 mg–NH 4 –N L −1 ) and the presence of biodegradable organic carbon (soluble COD (sCOD) between 7 and 230 mg-O 2 L −1 ). Two reactors were operated with different aeration strategies (intermittent vs. continuous), the other two with differences in biomass retention (recirculation or removal of detached biomass). Keeping a constant HRT caused instabilities due to difficulties with setting the optimal oxygen flux for the respective surface loadings (1.6–6 g–NH 4 –N m −2 d −1 ). Operating the MABRs with a constant surface loading (2 g–NH 4 –N m −2 d −1 ) resulted in higher and more stable total nitrogen (TN) removal independent of the aeration strategy. The intermittently aerated MABR improved from an average TN removal of 23%–69%, the continuously aerated MABR from 20% to 50% TN removal. Independent of the feeding strategy, the continuously aerated reactor removed slightly more ammonium (80–95%) compared to the intermittently aerated reactor (74–93%). Limiting the oxygen supply by intermittent aeration proofed successful to favor partial nitritation and anammox. Continuous aeration did not achieve stable suppression of nitrite oxidizing bacteria (NOB). Of the removed ammonium, approx. 26% were left in the effluent as nitrate (only 10% with intermittent aeration). Recirculation of the detached biomass resulted in reattachment onto the biofilm or membrane surface. This recirculation led to significantly higher biomass retention times and thus to better performance. Removing detached biofilm from the reactor caused a slightly lower TN removal of 33% compared to 45% with reattachment, while average ammonium removal was 58% compared to 63%, respectively. Scouring events had a significant impact on the overall operation, resulting in short term losses of TN removal capacities of 50–100%. The microbial community composition was different depending on the aeration strategy and biomass retention. The continuously aerated reactor contained significantly more AOB than the intermittently aerated MABR. The reactor with biomass retention contained less ammonium oxidizing bacteria (AOB), compared to the reactor with low biomass retention. In all MABRs, anammox bacteria established in the biofilm after an initial drop in abundance.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Membrane aerated biofilm reactors for mainstream partial nitritation/anammox: Experiences using real municipal wastewater

et al. 2020

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“…Autotrophic nitrogen removal via anammox microorganisms is an emerging application of MABRs. Lab-scale studies using synthetic feed have demonstrated the feasibility to achieve PN/A via an one-stage MABR where AOB are abundant in oxygenrich layers close to the lumen while anammox bacteria are located in the anoxic zone closer to the bulk liquid (Gong et al 2007;Pellicer-Nàcher et al 2014;Augusto et al 2018). In a recent lab-scale study, an one-stage MABR was used to treat municipal wastewater under mainstream conditions (Bunse et al 2020).…”

Section: Autotrophic Nitrogen Removalmentioning

confidence: 99%

Recent progress using membrane aerated biofilm reactors for wastewater treatment

Wagner

Carlson

et al. 2021

Water Science and Technology

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The membrane biofilm reactor (MBfR), which is based on the counter diffusion of the electron donors and acceptors into the biofilm, represents a novel technology for wastewater treatment. When process air or oxygen is supplied, the MBfR is known as the membrane aerated biofilm reactor (MABR), which has high oxygen transfer rate and efficiency, promoting microbial growth and activity within the biofilm. Over the past few decades, lab-scale studies have helped researchers and practitioners understand the relevance of influencing factors and biological transformations in MABRs. In recent years, pilot- to full-scale installations are increasing along with process modeling. The resulting accumulated knowledge has greatly improved understanding of the counter-diffusional biological process, with new challenges and opportunities arising. Therefore, it is crucial to provide new insights by conducting this review. This paper reviews wastewater treatment advancements using MABR technology, including design and operational considerations, microbial community ecology, and process modeling. Treatment performance of pilot- to full-scale MABRs for process intensification in existing facilities is assessed. This paper also reviews other emerging applications of MABRs, including sulfur recovery, industrial wastewater, and xenobiotics bioremediation, space-based wastewater treatment, and autotrophic nitrogen removal. In conclusion, commercial applications demonstrate that MABR technology is beneficial for pollutants (COD, N, P, xenobiotics) removal, resource recovery (e.g., sulfur), and N2O mitigation. Further research is needed to increase packing density while retaining efficient external mass transfer, understand the microbial interactions occurring, address existing assumptions to improve process modeling and control, and optimize the operational conditions with site-specific considerations.

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Effect of linear anionic surfactant (sodium dodecyl sulfate) dosage on nitrogen removal performance of an anammox reactor

Verma,

Haq,

Daverey

2024

CLEAN Soil Air Water

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The impact of sodium dodecyl sulfate (SDS, as model linear anionic surfactant) dosage on overall nitrogen removal performance of anammox reactor alongside its microbial population and sludge properties was investigated. In this study (day 136), an anmmox sequencing batch biofilm reactor was subjected to gradual dosage of SDS from 0 to 20 mg L−1. Intriguingly, results revealed that SDS at ≥7.5 mg L−1 prompted sludge disintegration, evidenced by increased protein and polysaccharide content in the effluent. Nevertheless, reactor's average total nitrogen removal efficiency slightly improved from 83.12% (0 mg L−1) to 86.3% (20 mg L−1). The 16S rRNA gene sequencing revealed that SDS dosing significantly suppressed the unwanted and unavoidable nitrite oxidizing bacteria (NOBs) in the reactor as the abundance of genus Nitrospira declined from 40.68% (day 1) to 19.15% (day 136). The abundance of anammox genus Candidatus Kuenenia significantly improved from 1.86% (day 1) to 40.02% (day 136) as a result of NOB suppression. This study revealed that low concentration of surfactants in wastewater does not affect the anammox bacteria in a biofilm reactor. Furthermore, adding low concentrations of SDS (≥7.5 to 20 mg L−1) to wastewater may effectively suppress notorious NOBs in biofilm‐based anammox systems.

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Fast start-up of the single-stage nitrogen removal using anammox and partial nitritation (SNAP) from conventional activated sludge in a membrane-aerated biofilm reactor

Cited by 82 publications

References 46 publications

Membrane aerated biofilm reactors for mainstream partial nitritation/anammox: Experiences using real municipal wastewater

Membrane aerated biofilm reactors for mainstream partial nitritation/anammox: Experiences using real municipal wastewater

Recent progress using membrane aerated biofilm reactors for wastewater treatment

Effect of linear anionic surfactant (sodium dodecyl sulfate) dosage on nitrogen removal performance of an anammox reactor

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