Nitrite Oxidation in Wastewater Treatment: Microbial Adaptation and Suppression Challenges

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(34), P. 12557 - 12570

Published: Aug. 17, 2023

Microbial nitrite oxidation is the primary pathway that generates nitrate in wastewater treatment systems and can be performed by a variety of microbes: namely, nitrite-oxidizing bacteria (NOB). Since NOB were first isolated 130 years ago, understanding phylogenetical physiological diversities has been gradually deepened. In recent endeavors advanced biological nitrogen removal, have more considered as troublesome disruptor, strategies on suppression often fail practice after long-term operation due to growth specific are able adapt even harsh conditions. line with review history currently known genera, phylogenetic tree constructed exhibit wide range different phyla. addition, behavior metabolic performance strains summarized. These features various (e.g., high oxygen affinity

Language: Английский

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Net-zero greenhouse gas emission from wastewater treatment: Mechanisms, opportunities and perspectives

Renewable and Sustainable Energy Reviews, Journal Year: 2023, Volume and Issue: 184, P. 113547 - 113547

Published: July 12, 2023

Language: Английский

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Design of Bi₄O₅Br₂/g‐C₃N₄ heterojunction for efficient photocatalytic removal of persistent organic pollutants from water

EcoEnergy, Journal Year: 2023, Volume and Issue: 1(1), P. 197 - 206

Published: Sept. 1, 2023

Abstract Dyes and antibiotics as typical persistent organic pollutants (POPs) are widely present in the environment, but can hardly be removed completely by traditional water treatment methods. Here, we designed Bi 4 O 5 Br 2 /g‐C 3 N composite nanosheets for efficient photocatalytic removal of POPs water. The with a heterojunction structure exhibited high adsorption activity tetracycline (TC) ciprofloxacin (CIP) excellent cyclic stability, owing to its large specific surface area well enhanced charge separation visible light utilization. Our characterization revealed that h + ·OH responsible degradation TC CIP. This work provides insights into design materials synergy degradation, offers construction strategy addressing increasingly severe environmental issues.

Language: Английский

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Towards scaling-up implementation of polyhydroxyalkanoate (PHA) production from activated sludge: Progress and challenges

Journal of Cleaner Production, Journal Year: 2024, Volume and Issue: 447, P. 141542 - 141542

Published: March 3, 2024

Polyhydroxyalkanoate (PHA) is a biodegradable biopolymer synthesized from renewable resources, providing sustainable and eco-friendly plastics. The utilization of activated sludge for PHA production has gained prominence due to its cost-effectiveness abundant availability. Upscaling can contribute waste management resource recovery simultaneously, thereby reducing the dependence on petroleum-based This review critically examines progress challenges in this field, while offering valuable insights into strategies enhancing productivity, improving product quality, costs. analysis primarily focuses identifying key factors influencing each stage three-stage process aimed at increasing productivity. Noteworthy proposed include optimizing enrichment feast/famine ratio. For high-quality PHA, emphasis oriented acid production, selection appropriate extraction methods crucial. also addresses cost reduction, discussing simplification through two-stage process, integration nitrogen removal with production. Future research directions are outlined, highlighting optimization scalability development efficient methods, assessment environmental impacts, alignment policy measures. Conclusively, sludge-based shows great promise necessitates further industrialization.

Language: Английский

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Acidophilic partial nitrification (pH<6) facilitates ultra-efficient short-flow nitrogen transformation: Experimental validation and genomic insights

Water Research, Journal Year: 2024, Volume and Issue: 260, P. 121921 - 121921

Published: June 12, 2024

Language: Английский

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Evaluation of nitrous oxide reduction in solid carbon source-driven counter-diffusional biofilm denitrification system

Water Research X, Journal Year: 2025, Volume and Issue: 27, P. 100306 - 100306

Published: Jan. 22, 2025

Solid carbon-driven biofilm system can provide sufficient carbon source for denitrification, while its counter-diffusional structure could inevitably induce the delayed carbon-nitrogen contact and electron transport, further affecting footprints mainly contributed by nitrous oxide (N2O) at wastewater treatment plants (WWTPs). However, detailed understanding of N2O dynamics during solid-phase denitrification (SPD) has not been disclosed. In this work, a fixed bed bioreactor driven polycaprolactone (PCL) was constructed operated over 180 days, achieving 97 %-99 % total nitrogen (TN) removal efficiency. Biochemical results indicated that under condition each (NO x ) concentration maintained 30 mg-N/L, competition between upstream downstream pools still observed PCL-driven even providing source. For example, coexistent nitrate (NO3 -)+ nitrite (NO2 -)+N2O condition, few electrons (i.e., 12.6 %) distributed to reductase (Nos), significantly decreasing reduction rate 1.42 mg/g VSS/h). Under TN in scheme containing NO3 -+NO2 -+N2O be 1.75-2.3 times higher than with sole NO mg-N/L. This suggested when treating multiple , only relatively improve efficiency, but also alleviate emissions. The abundance Bacteroidota Comamonadaceae ensured stable release conversion states.

Language: Английский

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Insights into the start-up of acidic nitritation using conventional activated sludge: Process dynamics, nitrifiers succession, and pilot-scale demonstration

Water Research, Journal Year: 2025, Volume and Issue: unknown, P. 123208 - 123208

Published: Jan. 1, 2025

Language: Английский

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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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How to Provide Nitrite Robustly for Anaerobic Ammonium Oxidation in Mainstream Nitrogen Removal

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(51), P. 21503 - 21526

Published: Dec. 14, 2023

Innovation in decarbonizing wastewater treatment is urgent response to global climate change. The practical implementation of anaerobic ammonium oxidation (anammox) treating domestic the key reconciling carbon-neutral management with sustainable development. Nitrite availability prerequisite anammox reaction, but how achieve robust nitrite supply and accumulation for mainstream systems remains elusive. This work presents a state-of-the-art review on recent advances anammox, paying special attention available pathways (forward-going (from nitrite) backward-going nitrate nitrite)), controlling strategies, physiological ecological characteristics functional microorganisms involved supply. First, we comprehensively assessed nitrite-oxidizing bacteria control methods, outlining that these technologies are transitioning possessing multiple selective pressures (such as intermittent aeration membrane-aerated biological reactor), integrating side stream free ammonia/free nitrous acid suppression recirculated sludge treatment), maintaining high activity ammonia-oxidizing competing oxygen bacteria. We then highlight emerging strategies supply, including production driven by novel microbes (ammonia-oxidizing archaea complete ammonia bacteria) reduction (partial denitrification nitrate-dependent methane oxidation). resources requirement different analyzed, hybrid pathway combining partial nitrification encouraged. Moreover, data-driven modeling process well proactive microbiome proposed hope achieving application. Finally, existing challenges further perspectives highlighted, i.e., investigation nitrite-supplying bacteria, scaling-up from laboratory under real conditions, stable performance fundamental insights this aim inspire advance our understanding about provide robustly shed light important obstacles warranting settlement.

Language: Английский

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Mitigating greenhouse gas emissions from municipal wastewater treatment in China

Environmental Science and Ecotechnology, Journal Year: 2023, Volume and Issue: 20, P. 100341 - 100341

Published: Nov. 13, 2023

Municipal wastewater treatment plays an indispensable role in enhancing water quality by eliminating contaminants. While the process is vital, its environmental footprint, especially terms of greenhouse gas (GHG) emissions, remains underexplored. Here we offer a comprehensive assessment GHG emissions from plants (WWTPs) across China. Our analyses reveal estimated 1.54 (0.92–2.65) × 104 Gg release GHGs (CO2-eq) 2020, with dominant contribution N2O and electricity consumption. We can foresee 60–65 % reduction potential promising advancements treatment, such as cutting-edge biological techniques, intelligent strategies, shift towards renewable energy sources.

Language: Английский

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