High-resolution mapping and modeling of anammox recovery from recurrent oxygen exposure

Seuntjens, Dries; Carvajal-Arroyo, José M.; Ruopp, M.; Bunse, Philipp; C, Mulder; Lochmatter, Samuel; Agrawal, Shelesh; Boon, Nico; Lackner, Susanne; Vlaeminck, Siegfried E.

doi:10.1016/j.watres.2018.07.024

Cited by 63 publications

(31 citation statements)

References 33 publications

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“…Under these mainstream PN/A is still a challenge. The anammox process is key and requires nitrite and ammonium while at the same time dissolved oxygen (DO) must be absent ( Seuntjens et al., 2018 ). In single stage processes, effective oxygen limitation usually protects anaerobic ammonium oxidizing bacteria (AnAOB) from oxygen inhibition ( Lotti et al., 2015 ).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Therefore, the elevated DO concentration stimulated the AOB existing in UPBAn1 reactor and resulted in nitritation of a portion of incoming NH 4 + ─N and NO 2 − ─N. Low DO (<0.5 mg L −1 ) concentrations in the feeding tanks especially during the first periods of anammox enrichment is advisable . Other studies such as Ding et al .…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Sludge Digester Effluent as Feeding Solution for the Enrichment of Anammox Bacteria

Çelen-Erdem

2020

CLEAN Soil Air Water

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The aim of this study is to evaluate the feasibility of sludge digester effluent as feeding solution to enrich anaerobic ammonium oxidation (anammox) bacteria. The performance of the two parallel pilot scale‐upflow packed bed anammox reactors (UPBAn1 and UPBAn2) are examined in terms of the enrichment of anammox bacteria. The control experiment is set up conducting synthetic wastewater as feeding solution in the UPBAn1 reactor whereas, the sludge digester effluent is fed to the nitritation reactor and then the partially nitrated digester effluent to the UPBAn2 reactor. Anammox activities are evaluated by mass balances based on ammonium (NH4+), nitrite (NO2−), and nitrate (NO3−) analysis and NRR. Microbial community of anammox bacteria is analyzed using real‐time polymerase chain reaction (PCR). The results demonstrate that UPBAn 1 and UPBAn2 reactors are successfully enriched on days 64 and 40 with NRRs of 19.54 and 19.43 g N m−3 per day, respectively. This study reveals that both synthetic wastewater and digester effluent are suitable for the enrichment of anammox bacteria; however, digester effluent as feeding solution for enrichment of anammox bacteria based on the ease of process control and process stability is more advisable.

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“…It can be seen that at the lower activity of microorganisms in biofilm (related with lower concentrations of substratesbelow affinity constants of the main bacterial groups) and under high concentration of dissolved oxygen in the bulk-liquid, biofilm can be fully penetrated with oxygen (Figure 2(A)). It has a high importance, since AnAOB are strongly inhibited by oxygen and anammox process can be suppressed during aeration phase and for some period of time after aeration is ceased [44]. This justifies also a scheme of stopping aeration periodically in the system (intermittent aeration).…”

Section: Resultsmentioning

confidence: 99%

Possible mechanism of efficient mainstream partial nitritation/anammox (PN/A) in hybrid bioreactors (IFAS)

Trojanowicz

Trela

Płaza

2019

Environmental Technology

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An explanation of possible mechanism of efficient PN/A in hybrid bioreactors was presented. The bottleneck process is nitritation. Surplus nitrite production by ammonium oxidizing bacteria (AOB) is required for assuring the activity of anammox bacteria and eliminating nitrite oxidizing bacteria (NOB). It will be possible if nitrogen removal rate by AOB (r N_AOB ) is higher than NOB (r N_NOB ). It was shown that in biofilm AnAOB bacteria should out-compete NOB, whereas nitrogen transformation rates by AOB are usually lower than NOB. However, the growth of r-AOB in activated sludge allows out-selecting NOB. Impact of ammonium-, nitrite-nitrogen and suspended biomass concentration in hybrid PN/A systems on nitrogen removal rates in the temperature ranges from 10°C to 25°C was presented and discussed. Because bulk liquid ammonium nitrogen concentration can be higher in SBR bioreactors (after certain period of time after aeration starts) or in the initial zones of plug-flow systems than in fully mixed systems, conditions for running efficient PN/A are more favourable in intermittently aerated 'IFAS-SBR' or 'IFAS-plug flow' bioreactors.

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High-resolution mapping and modeling of anammox recovery from recurrent oxygen exposure

Cited by 63 publications

References 33 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

Evaluation of Sludge Digester Effluent as Feeding Solution for the Enrichment of Anammox Bacteria

Possible mechanism of efficient mainstream partial nitritation/anammox (PN/A) in hybrid bioreactors (IFAS)

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