Firmicutes and Bacteroidetes as the dominant microorganisms for ammonium nitrogen wastewater treatment with a low C/N ratio in BCOR

Journal of Water Process Engineering, Год журнала: 2024, Номер 65, С. 105851 - 105851

Опубликована: Июль 28, 2024

Язык: Английский

---

Upgrade and reconstruction of biological processes in municipal wastewater treatment plants

Desalination and Water Treatment, Год журнала: 2024, Номер 317, С. 100299 - 100299

Опубликована: Янв. 1, 2024

Traditional activated-sludge treatment technologies, such as anaerobic/anoxic/aerobic processes, oxidation ditch and sequential batch reactors, play a crucial role in the removal of nitrogen phosphorus from municipal wastewater. The synergistic interactions among functional microorganisms, primarily nitrogen-removal organisms phosphorus-accumulating organisms, are paramount these processes. However, traditional activated sludge technology consumes large amounts energy produces substantial volume waste-activated sludge, necessitating upgrade wastewater plants (WWTPs) focusing on sustainable development goals. This review analyzes characterizes key microorganisms (Nitrosomonas, Nitrosospira, Nitrobacter, Nitrospira, Thauera, Pseudomonas, Candidatus Brocadia, Kuenenia, Accumulibacter) involved treatment. It also explores impact operating conditions, influent quality, reactor configurations regulation for efficient nutrient removal, with emphasis upgrading reconstructing techniques full-scale anaerobic ammonium (anammox) Integrated fixed-film sludge-based (IFAS), aerobic granular (AGS), moving bed biofilm (MBBR) technologies promising to enhance transform conventional realizing new engineering applications practices. Other developments use heterotrophic denitrifying bacteria Thauera anammox (Candidatus Brocadia Kuenenia) mainstream partial denitrification/anammox which potentially expandable WWTPs.

Язык: Английский

---

Enhancement of simultaneous nitrification denitrification (SND) and simultaneous nitrification-anammox-denitrification (SNAD) via 3D printed carriers: Insights into critical factors, functional microbes, and potential solutions

Journal of Cleaner Production, Год журнала: 2024, Номер 458, С. 142520 - 142520

Опубликована: Май 9, 2024

Язык: Английский

---

Acidobacteria as the dominant microorganism on the nitrogen-removal wastewater treatment with a low chemical oxygen demand/ammonium nitrogen ratio in biological contact oxidation reactor

Journal of Environmental Management, Год журнала: 2025, Номер 373, С. 123891 - 123891

Опубликована: Янв. 1, 2025

Язык: Английский

---

Investigation of Nitrogen Conversion Efficiency in Hydrogen-based Autotrophic Nitrate Reduction Reactor

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Фев. 10, 2025

This study investigates the performance of a hydrogen-based membrane biofilm reactor (MBfR) for nitrogen transformation over an extended operational period exceeding 200 days. During monitoring, sustained highly alkaline conditions with pH consistently 11.20, while achieving ammonia conversion efficiency above 60% and maintaining nitrite accumulation rate below 1%. Integrated mass balance calculations microbial community profiling revealed coexistence denitrification dissimilatory nitrate reduction to ammonium (DNRA) pathways within network. A factorial experimental design was implemented hydraulic retention time (HRT) influent concentration as independent variables, generating nine distinct regimes through cross-variable permutations. Subsequent analysis extensive datasets enabled development Response Surface Methodology (RSM) model simulate dynamics. Model validation confirmed statistical reliability predictive accuracy RSM framework. Critical demonstrated that in hydrogen autotrophic system exhibited significant correlation individual variables themselves but showed negligible dependence on their interactive effects. These findings provide novel insights into process optimization strategies theoretical understanding convention.

Язык: Английский

---

New biological treatment method of domestic wastewater with simultaneous nitrification and denitrification based on detached biofilm

Applied Water Science, Год журнала: 2025, Номер 15(4)

Опубликована: Март 14, 2025

The paper relates to the treatment of municipal wastewater by intensifying simultaneous nitrification and denitrification processes. obtained results can be applied construction new plants as well upgrading existing facilities enhance nitrogen removal efficiency from treated water. developed method corresponding installation leverage potential floating biofilm within activated sludge systems initiate sustain processes throughout entire volume biological reactor. film is supplied in technological flow based on periodic aeration submerged biofilter compartment located post-aeration zone with a periodicity shorter than residence time Nitrification achieves an up 99.3%. Simultaneously, occurs ranging 19.9 91.1%, which fundamentally correlated temperatures wastewater. presence microorganism conglomerates sludge, detached through innovative method, initiates enhances process during continuous aeration, due functioning formed these conglomerates. Denitrification has been observed both terms substrate consumption available (COD) result bacterial lysis anaerobic interfloccular zone, without external carbon substrate. evaluated analyzing compartments cocoons conglomerates, are interflocular zone. This becomes more prominent where there deficiency sources (CODCr) wastewater, especially at 17.6 °C 20.4 °C. were implemented line Causeni city Wastewater Treatment Plant (Republic Moldova).

Язык: Английский

---

Investigation of nitrogen conversion efficiency in hydrogen-based autotrophic nitrate reduction reactor

Journal of Water Process Engineering, Год журнала: 2025, Номер 72, С. 107536 - 107536

Опубликована: Март 22, 2025

Язык: Английский

---

Bacterial resistome in different stages of wastewater treatment plant is highly impacted by the abundance of the Pseudomonadota community

Bioresource Technology Reports, Год журнала: 2024, Номер 26, С. 101814 - 101814

Опубликована: Март 18, 2024

Язык: Английский

---

Modeling complete and shortcut simultaneous nitrification and denitrification coupled to phosphorus removal in moving bed biofilm reactors

Journal of Water Process Engineering, Год журнала: 2024, Номер 59, С. 105022 - 105022

Опубликована: Фев. 23, 2024

This study aimed to model simultaneous nitrification and denitrification (SND) shortcut (partial) SND processes coupled phosphorus removal in lab-scale moving bed biofilm reactors based on data collected during two different experimental campaigns. Modeling was performed using BioWin 6.0 accurately predict the results. A sensitivity analysis conducted for first campaign identified most influential process parameters. The absolute variance, Thiel's inequality coefficient, normal objective function were used evaluate consistency of modeled data. calibrated validated models satisfactorily reproduced all campaigns within acceptance criteria, resulting a suitable tool predicting efficiency. Moreover, test dissolved oxygen (DO) ranges (0.6–0.8 mg O2·L−1), pH (6.5–9.0), hydraulic retention time (HRT) (0.5–1.0 d) improve SND. Based simulated scenarios, intermittent DO conditions can induce maintain inhibition nitrite-oxidizing bacteria with an average N-NO3− concentration 0.05 N·L−1, while HRT 0.9 d resulted effluent N-NH4+, N-NO2− concentrations 4.0, 0.02 0.07 mg·L−1, respectively, indicating efficient process.

Язык: Английский

---

Soil nitrogen availability and microbial carbon use efficiency are dependent more on chemical fertilization than winter drought in a maize–soybean rotation system

Frontiers in Microbiology, Год журнала: 2024, Номер 15

Опубликована: Март 14, 2024

Soil nitrogen (N) availability is one of the limiting factors crop productivity, and it strongly influenced by global change agricultural management practices. However, very few studies have assessed how winter drought affected soil N during subsequent growing season under chemical fertilization. We conducted a field investigation involving snow removal to simulate conditions in Mollisol cropland Northeast China as part 6-year fertilization experiment, we examined physicochemical properties, microbial characteristics, availability. Our results demonstrated that significantly increased ammonium total 42.9 90.3%, respectively; combined treatment exhibited highest at end season. As continued, variation was explained more than drought. The Mantel test further indicated Olsen-P content carbon use efficiency (CUE) were related A community structure largest fraction nitrate Microbial CUE showed strongest correlation with availability, followed available C:P bacteria:fungi ratios conditions. Overall, clarified that, despite weak effect on cannot be ignored. study also identified important role microorganisms transformations, even seasonally snow-covered northern croplands.

Язык: Английский

---