Challenges of suppressing nitrite-oxidizing bacteria in membrane aerated biofilm reactors by low dissolved oxygen control

Water Research, Journal Year: 2023, Volume and Issue: 247, P. 120754 - 120754

Published: Oct. 18, 2023

Membrane aerated biofilm reactor (MABR) and shortcut nitrogen removal are two types of solutions to reduce energy consumption in wastewater treatment, with the former improving aeration efficiency latter reducing oxygen demand. However, integrating these solutions, i.e., achieving MABR, is challenging due difficulty suppressing nitrite-oxidizing bacteria (NOB). In this study, four MABRs were established demonstrate feasibility initiating, maintaining, restoring NOB suppression using low dissolved (DO) control, presence absence anammox bacteria, respectively. Long-term results revealed that strict DO (< 0.1 mg/L) MABR could initiate maintain stable for more than five months nitrite accumulation ratio above 90%, but it was unable re-suppress once they prevailed. Moreover, increased threshold level MABRs, still incapable restore deteriorated conjunction control. Mathematical modelling confirmed experimental further explored differences conventional biofilms biofilms. Simulation showed compared biofilms, regardless thickness or influent concentration. Kinetic mechanisms different proposed, suggesting difficult wash out developed innermost layer because high sludge wasting rate. summary, study systematically demonstrated challenges through both experiments mathematical modelling. These findings provide valuable insights into applications call studies developing effective strategies achieve energy-efficient configuration.

Language: Английский

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Sustainable wastewater management through nitrogen-cycling microorganisms

Nature Water, Journal Year: 2024, Volume and Issue: 2(10), P. 936 - 952

Published: Oct. 14, 2024

Language: Английский

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Anaerobic oxidation of methane driven by different electron acceptors: A review

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 946, P. 174287 - 174287

Published: June 28, 2024

Language: Английский

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Enhancing bioelectrochemical processes in anaerobic membrane bioreactors for municipal wastewater treatment: A comprehensive review

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 484, P. 149420 - 149420

Published: Feb. 7, 2024

Language: Английский

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Superior mainstream partial nitritation in an acidic membrane-aerated biofilm reactor

Water Research, Journal Year: 2024, Volume and Issue: 257, P. 121692 - 121692

Published: April 29, 2024

Shortcut nitrogen removal holds significant economic appeal for mainstream wastewater treatment. Nevertheless, it is too difficult to achieve the stable suppression of nitrite-oxidizing bacteria (NOB), and simultaneously maintain activity ammonia-oxidizing (AOB). This study proposes overcome this challenge by employing novel acid-tolerant AOB, namely "Candidatus Nitrosoglobus", in a membrane-aerated biofilm reactor (MABR). Superior partial nitritation was demonstrated low-strength from two aspects. First, long-term operation (256 days) under acidic pH range 5.0 5.2 showed successful NOB washout situ free nitrous acid (FNA) approximately 1 mg N/L. evidenced nitrite accumulation ratio (NAR) close 100 % disappearance shown 16S rRNA gene amplicon sequencing fluorescence hybridization. Second, oxygen sufficiently supplied MABR, leading an unprecedentedly high ammonia oxidation rate (AOR) at 2.4 ± 0.1 kg N/(m

Language: Английский

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Insights into feasibility and microbial characterizations on simultaneous elimination of dissolved methane from anaerobic effluents and nitrate/nitrite reduction in a conventional anoxic reactor with magnetite

Water Research, Journal Year: 2024, Volume and Issue: 256, P. 121567 - 121567

Published: April 2, 2024

Language: Английский

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Single cell protein production from methane in a gas-delivery membrane bioreactor

Water Research, Journal Year: 2024, Volume and Issue: 259, P. 121820 - 121820

Published: May 22, 2024

Single cell protein (SCP, or microbial protein) is one of the emerging alternative sources to address global challenge food insecurity. Recently, SCP produced from methane has attracted substantial attention since a renewable resource attainable anaerobic digestion. However, supply methane, an insoluble gas in water, major challenges producing methane-based SCP. This work developed novel bioreactor configuration, which hollow fiber membrane was used for efficient while microorganisms were growing suspended form favourable biomass harvest. Over 312-day operation, impacts three critical parameters on production investigated, including ratio loading ammonium loading, oxygen and sludge retention time (SRT). Under condition 4 g CH

Language: Английский

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Impact of hydrogen sulfide on anammox and nitrate/nitrite-dependent anaerobic methane oxidation coupled technologies

Water Research, Journal Year: 2024, Volume and Issue: 257, P. 121739 - 121739

Published: May 4, 2024

Language: Английский

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A review of modified and hybrid anaerobic baffled reactors for municipal wastewater treatment with a focus on emerging contaminants

Environmental Science Water Research & Technology, Journal Year: 2024, Volume and Issue: 10(6), P. 1335 - 1354

Published: Jan. 1, 2024

This review discusses municipal wastewater treatment using anaerobic baffled reactors (ABRs) and modified ABRs to remove C, N, P emerging contaminants.

Language: Английский

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Enrichment of comammox Nitrospira from three different seed sludges with addition of signaling molecules

Water Research, Journal Year: 2024, Volume and Issue: 268, P. 122617 - 122617

Published: Oct. 11, 2024

Language: Английский

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