Partial nitrification coupled with anammox (PN/A) process is an energy-efficient approach for nitrogen removal from low C/N wastewater. In this study, PN/A was achieved with optimal oxygen supply from a green microalga, . The PN process was first initiated within 35 days, and the following algae-intensified PN then reached the steady state within the next 32 days. The dissolved oxygen (DO) concentration was gradually maintained at 0.6 mg L adjusting the photoperiod to 6-h light/18-h dark cycles, when the accumulation ratio of NO -N and the removal ratio of NH -N were both more than 90%. The nitrogen removal capability of anammox was acclimated elevating the individual effluent NH -N and NO -N levels from 100 to 200, to 300 mg L. After acclimation, the removal rates of NH -N and total nitrogen (TN) reached more than 70 and 80%, respectively, and almost all the NO -N was removed. Then, the algae-intensified PN/A, algammox biofilm system, was successfully started up. When the NH -N level increased from 100 to 300 mg L, the TN removal varied between 78 and 82%. In the photosequencing bioreactor, , ammonia-oxidizing bacteria (AOB), and anammox coexisted with an illumination of 200 μmol m s and a 6-h light/18-h dark cycles. The DO levels ranged between 0.4 and 0.5 mg L. In addition, the microbial community analysis by Illumina MiSeq sequencing showed that the dominant functional bacteria in the algae-intensified PN/A reactors included (AOB) and (anammox), while and (nitrite oxidizing bacteria), together with (denitrifier) were largely inhibited. Further studies are required to optimize the microalgal-bacterial consortia system to achieve superior nitrogen removal rates under controllable conditions.
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http://dx.doi.org/10.3389/fbioe.2022.851800 | DOI Listing |
Int J Gen Med
January 2025
Department of Urology, Peking University People's Hospital, Beijing, 100044, People's Republic of China.
Objective: This study investigated the efficacy of comprehensive management and predictable inflammatory markers for idiopathic retroperitoneal fibrosis (iRPF)-related hydronephrosis outcomes.
Methods: Patients with iRPF-related hydronephrosis underwent surgical (ureteral stent and/or nephrostomy tube placement) and medical (corticosteroid-based multiple immunosuppressants) management were classified according to stent-indwelling outcomes. Univariate analysis of clinical profiles was conducted to screen possible predictors of hydronephrosis remission.
Bioresour Technol
January 2025
National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, PR China. Electronic address:
There is limited understanding of the granular partial denitrification/anammox (PD/A) microbiota and metabolic hierarchy specific to municipal wastewater treatment, particularly concerning the multi-mechanisms of functional differentiation and granulation tendencies under high-loading shocks. Therefore, this study utilized fragmented mature biofilm as the exclusive inoculum to rapidly establish a granular PD/A system. Following long-term feeding with municipal wastewater, PD/A process reached a total nitrogen removal efficiency of 97.
View Article and Find Full Text PDFBioresour Technol
January 2025
School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China. Electronic address:
Organic carbon can influence nitrogen removal during the anaerobic ammonia oxidation (anammox) process. Propionate, a common organic compound in pretreated wastewater, its impacts on mixotrophic anammox bacteria and the underlying mechanisms have not been fully elucidated. This study investigated the core metabolism and shift in behavior patterns of mixotrophic Candidatus Brocadia sapporoensis (AMXB) under long-term propionate exposure.
View Article and Find Full Text PDFJ Hazard Mater
January 2025
Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China. Electronic address:
Quorum sensing (QS) is recognized for enhancing bacterial resistance against heavy metals by regulating the production of extracellular substances that hinder metal penetration into the intracellular environment. However, it remains unclear whether QS contributes to resistance by regulating electron transfer, thereby transforming metals from more toxic to less toxic forms. This study investigated the regulatory mechanism of acyl-homoserine lactone (AHL)-mediated QS on electron transfer under As(III) and Cr(VI) stress.
View Article and Find Full Text PDFHeliyon
January 2025
Institute of Chemistry, University of Tartu, 14a Ravila St., 50411, Tartu, Estonia.
Elevated concentrations of pharmaceutically active compounds (PhACs) in the water bodies are posing a serious threat to the aquatic microbiota and other organisms. In this context, anaerobic ammonium oxidizing (anammox) bacteria carry a great potential to degrade PhACs through their innate metabolic pathways. This study investigates the influence of short-term exposure to lower and higher concentrations (0.
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