Performance and mechanism of modified biological nutrient removal process in treating low carbon-to-nitrogen ratio wastewater

Li, Donghui; Li, Weiguang; Zhang, Duoying; Zhang, Kailei; Lv, Longyi; Zhang, Guanglin

doi:10.1016/j.biortech.2022.128254

Cited by 30 publications

(8 citation statements)

References 35 publications

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“…Their interactions with other organisms significantly impact various human activities, including agriculture, water treatment, etc. ( Figure 2 ) [ 95 ]. The study of these ecological phenomena requires isolated strains, as direct observation of natural ecosystems is much more challenging due to the higher complexity and lack of experimental control.…”

Section: Discussionmentioning

confidence: 99%

Using Genomics to Decipher the Enigmatic Properties and Survival Adaptation of Candidate Phyla Radiation

2023

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Microbial ecology is a critical field for understanding the composition, diversity, and functions of microorganisms in various environmental and health-related processes. The discovery of Candidate Phyla Radiation (CPR) through culture-independent methods has introduced a new division of microbes characterized by a symbiotic/parasitic lifestyle, small cell size, and small genome. Despite being poorly understood, CPRs have garnered significant attention in recent years due to their widespread detection in a variety of environmental and clinical samples. These microorganisms have been found to exhibit a high degree of genetic diversity compared to other microbes. Several studies have shed light on their potential importance in global biogeochemical cycles and their impact on various human activities. In this review, we provide a systematic overview of the discovery of CPRs. We then focus on describing how the genomic characteristics of CPRs have helped them interact with and adapt to other microbes in different ecological niches. Future works should focus on discovering the metabolic capacities of CPRs and, if possible, isolating them to obtain a better understanding of these microorganisms.

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Section: Discussionmentioning

confidence: 99%

Using Genomics to Decipher the Enigmatic Properties and Survival Adaptation of Candidate Phyla Radiation

2023

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“…Typically, when treating wastewater with a low C/N ratio, an additional carbon source is often added to ensure 10.3389/fmicb.2023.1140404 adequate denitrification (Li et al, 2023). However, carbon source supplementation necessitates the use of large amounts of chemicals, the production of which generally involves the consumption of energy derived from fossil fuels, which to some extent could be construed as the transference of water pollution to air pollution, and consequently, does not contribute extensively to solving fundamental environmental problems (He et al, 2019).…”

Section: The Potential Applicationmentioning

confidence: 99%

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

Zhong

Pang³

et al. 2023

Front. Microbiol.

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In this study, the influence of Fe3+ on N removal, microbial assembly, and species interactions in a biofilm system was determined. The results showed that maximum efficiencies of ammonia nitrogen (NH4+-N), total nitrogen (TN), phosphorus (P), and chemical oxygen demand (COD) removal were achieved using 10 mg/L Fe3+, reaching values of 100, 78.85, 100, and 95.8%, respectively, whereas at concentrations of 15 and 30 mg/L Fe3+ suppressed the removal of NH4+-N, TN, and COD. In terms of absolute abundance, the expression of bacterial amoA, narG, nirK, and napA was maximal in the presence of 10 mg/L Fe3+ (9.18 × 105, 8.58 × 108, 1.09 × 108, and 1.07 × 109 copies/g dry weight, respectively). Irrespective of Fe3+ concentrations, the P removal efficiency remained at almost 100%. Candidatus_Competibacter (10.26–23.32%) was identified as the most abundant bacterial genus within the system. Determinism (50%) and stochasticity (50%) contributed equally to microbial community assembly. Co-occurrence network analysis revealed that in the presence of Fe3+, 60.94% of OTUs in the biofilm system exhibited positive interactions, whereas 39.06% exhibited negative interactions. Within the OTU-based co-occurrence network, fourteen species were identified as key microbes. The stability of the system was found to be predominantly shaped by microbial cooperation, complemented by competition for resources or niche incompatibility. The results of this study suggested that during chemical P removal in wastewater treatment plants using biofilm methods, the concentration of supplemental Fe3+ should be maintained at 10 mg/L, which would not only contribute to P elimination, but also enhance N and COD removal.

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“…Ferruginibacter increased from the main digester to the oxygen-activated stage from 0.4% to 7.1%. This genus is associated with aerobic conditions, denitrification and higher COD utilization [31]. Another genus from the same family, Chitinophagaceae, which could not be cultivated yet, was not found in the main digester but showed an abundance of 4.9% in the PEGA BB reactor.…”

Section: Taxonomic Profiles and Microbial Diversitymentioning

confidence: 99%

Microbiome Characterization after Aerobic Digestate Reactivation of Anaerobically Digested Sewage Sludge

et al. 2023

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A demonstrator plant of a recently patented process for improved sludge degradation has been implemented on a municipal scale. In a 1500 m3 sewage sludge digester, an intermediary stage with aerobic sewage sludge reactivation was implemented. This oxic activation increased the biogas yield by up to 55% with a 25% reduction of the remaining fermentation residue volume. Furthermore, this process allowed an NH4-N removal of over 90%. Additionally, 16S rRNA gene amplicon high-throughput sequencing of the reactivated digestate showed a reduced number of methane-forming archaea compared to the main digester. Multiple ammonium-oxidizing bacteria were detected. This includes multiple genera belonging to the family Chitinophagaceae (the highest values reached 18.8% of the DNA sequences) as well as a small amount of the genus Candidatus nitrosoglobus (<0.3%). In summary, the process described here provides an economically viable method to eliminate nitrogen from sewage sludge while achieving higher biogas yields and fewer potential pathogens in the residuals.

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Performance and mechanism of modified biological nutrient removal process in treating low carbon-to-nitrogen ratio wastewater

Cited by 30 publications

References 35 publications

Using Genomics to Decipher the Enigmatic Properties and Survival Adaptation of Candidate Phyla Radiation

Using Genomics to Decipher the Enigmatic Properties and Survival Adaptation of Candidate Phyla Radiation

Effect of Fe3+ on the nutrient removal performance and microbial community in a biofilm system

Microbiome Characterization after Aerobic Digestate Reactivation of Anaerobically Digested Sewage Sludge

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