Enhanced aerobic granulation for treating low-strength wastewater in an anaerobic-aerobic-anoxic sequencing batch reactor by selecting slow-growing organisms and adding carriers

Liang, Dongbo; Guo, Wei; Li, Dongyue; Ding, Fan; Li, Peilin; Zheng, Zhaoming; Li, Jun

doi:10.1016/j.envres.2021.112547

Cited by 59 publications

(10 citation statements)

References 68 publications

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“…At the phylum level (top15), radionuclide exposure significantly changed the relative abundance of Proteobacteria , Bacteroidota , Actinobacteria , Desulfobacterota , Calditrichota , Dependentiae , Bdellovibrionota , and Verrucomicrobiota belonging to Clade_Ia , Francisella , Clade_ III , Litoricola , Clade_II , Ilumatobacter , Halioglobus , Stappiaceae , Donghicola , and Marinobacterium (Figure B,E). Previous reports have implicated Clade_3 , , Actinobacteriota , and Desulfobacterota_ B in carbohydrate degradation and the phosphorus, sulfur, nitrogen, and methane cycles whereas Verrucomicrobiota is involved in methane metabolism, CO 2 fixation, and nitrogen assimilation .…”

Section: Resultsmentioning

confidence: 99%

Tritium and Carbon-14 Contamination Reshaping the Microbial Community Structure, Metabolic Network, and Element Cycle in the Seawater Environment

Lai¹,

Li²,

Wang³

et al. 2023

Environ. Sci. Technol.

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The potential ecological risks caused by entering radioactive wastewater containing tritium and carbon-14 into the sea require careful evaluation. This study simulated seawater’s tritium and carbon-14 pollution and analyzed the effects on the seawater and sediment microenvironments. Tritium and carbon-14 pollution primarily altered nitrogen and phosphorus metabolism in the seawater environment. Analysis by 16S rRNA sequencing showed changes in the relative abundance of microorganisms involved in carbon, nitrogen, and phosphorus metabolism and organic matter degradation in response to tritium and carbon-14 exposure. Metabonomics and metagenomic analysis showed that tritium and carbon-14 exposure interfered with gene expression involving nucleotide and amino acid metabolites, in agreement with the results seen for microbial community structure. Tritium and carbon-14 exposure also modulated the abundance of functional genes involved in carbohydrate, phosphorus, sulfur, and nitrogen metabolic pathways in sediments. Tritium and carbon-14 pollution in seawater adversely affected microbial diversity, metabolic processes, and the abundance of nutrient-cycling genes. These results provide valuable information for further evaluating the risks of tritium and carbon-14 in marine environments.

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Section: Resultsmentioning

confidence: 99%

Tritium and Carbon-14 Contamination Reshaping the Microbial Community Structure, Metabolic Network, and Element Cycle in the Seawater Environment

Lai¹,

Li²,

Wang³

et al. 2023

Environ. Sci. Technol.

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“…Especially, the relative abundance of Tetrasphaera significantly increases from 1.82 to 7.60% during the operation of 100 days ( P < 0.01, Figure 3). Indeed, Tetrasphaera and Dechloromonas were identified as endogenous denitrifiers, which could drive the denitrification process during the post anoxic stage (Liang et al, 2021; Wang et al, 2019). Obviously, the enrichment of polyphosphate‐accumulating organisms and denitrifiers could enhance nutrient removal.…”

Section: Resultsmentioning

confidence: 99%

Advanced nutrient removal and external sludge reduction: Demonstration in a pilot‐scale sequencing batch reactor

Yang

Chang

Peng

et al. 2023

Water Environment Research

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Although the addition of excess sludge fermentation products to improve nutrient removal from sewage is cost‐effective, its application has rarely been demonstrated. In this study, the external sludge was first collected and fermented under a sludge retention time of 10 days, then introduced into SBR with a 1:15 sewage ratio. The results revealed a gradual increase in the nitrite accumulation ratio to 34.7% in the SBR at the end of the oxic stage after 64 days of adding fermented sludge products. In addition, the average effluent total nitrogen and phosphorous decreased to 7.3 and 0.5 mg/L, corresponding to removal efficiencies of 86.7% and 95.5%, respectively. On the other hand, the use of the fermented sludge products as external organic carbon sources in the SBR increased the external sludge reduction ratio to 42.5%. High‐throughput sequencing demonstrated that the increase in the endogenous denitrifier community, polyphosphate‐accumulating organisms, and fermentation bacteria were the main factors contributing to the increase in nutrient removal and excess sludge reduction. The economic evaluation indicated that the operational cost of the pilot‐scale system saves 0.011$/m3 of sewage treated. Practitioner Points Fermented sludge addition effectively enhanced nutrient removal in pilot‐scale SBR. Average effluent TN and PO43−–P decreased to 7.3 and 0.5 mg/L, respectively. Highest external sludge reduction rate was 42.5% in pilot‐scale reactor. Sewage treatment cost can save 0.011$/m3 under advanced nutrient removal.

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“…norank_f__NS9_marine_group and norank_f__Chitinophageae , both ammonia oxidizing bacteria (AOB) that can transform ammonium to nitrite (Liang et al, 2022; Wang et al, 2020), were the third (4.9%) and fourth (2.8%) most abundant genera in the Control and less abundant in the other treatments (0.7%–3.0%). The higher relative abundance of AOB in the Control could partially explain its high NO 2 − ‐N accumulation (Figure 4b).…”

Section: Resultsmentioning

confidence: 99%

“…This genus was especially abundant in Fe x S y (8.9%), noticeably higher than that in Fe x S y @BC (2.6%), BC (2.6%), and Control (1.9%), which can partially explain the higher SO 4 2À production in Fe x S y (Figure 5a). norank_f__NS9_marine_group and norank_f__Chitinophageae, both ammonia oxidizing bacteria (AOB) that can transform ammonium to nitrite (Liang et al, 2022;Wang et al, 2020), were the third (4.9%) and fourth (2.8%) most abundant genera in the Control and less abundant in the other treatments (0.7%-3.0%). The higher relative abundance of AOB in the Control could partially explain its high NO 2 À -N accumulation (Figure 4b).…”

Section: Microbial Community Analysismentioning

confidence: 99%

Synergetic effects of pyrrhotite and biochar on simultaneous removal of nitrate and phosphate in autotrophic denitrification system

Zhang

Sun

Tian

et al. 2023

Water Environment Research

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In the trend of upgrading wastewater treatment plants, developing advanced treatment technologies for more efficient nutrient removal is crucial. This study prepared a pyrrhotite‐biochar composite (FexSy@BC) to investigate its potential for simultaneous removal of nitrate and phosphate under autotrophic denitrification conditions. X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), and X‐ray photoelectron spectroscopy (XPS) were used to characterize the novel composite of FexSy@BC, which exhibited 9.2 mg N/(L·d) NO3−‐N reduction rate, 97.3% N2 production, and 81.8 mmol N/(kg·d) NO3−‐N material load with small solid/liquid ratio (0.008). The NO3−‐N removal with FexSy@BC was 1.2–2.2 times higher than that with pure iron sulfides or biochar or their mixtures, whereas the Δn(S)/Δn(N) of FexSy@BC was the lowest (1.80). Moreover, the PO43−‐P reduction rate of FexSy@BC reached 3.23 mg P/(L·d), as high as that of pure pyrite or pyrrhotite. Thiobacillus was the most dominant denitrifying bacterium. FexSy@BC exhibited great promise for enhancing nutrient removal from secondary effluent without additional carbon source. Practitioner Points FexSy@BC enhanced nitrate and phosphate removal simultaneously. First‐order kinetics and Monod model were fitted for denitrification with FexSy@BC. FexSy@BC had smaller molar ratio of sulfate release to nitrate removal. Thiobacillus was the dominant bacterium in FexSy@BC autotrophic denitrification. Synergistic effects on nutrients removal existed between biochar and pyrrhotite.

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Enhanced aerobic granulation for treating low-strength wastewater in an anaerobic-aerobic-anoxic sequencing batch reactor by selecting slow-growing organisms and adding carriers

Cited by 59 publications

References 68 publications

Tritium and Carbon-14 Contamination Reshaping the Microbial Community Structure, Metabolic Network, and Element Cycle in the Seawater Environment

Tritium and Carbon-14 Contamination Reshaping the Microbial Community Structure, Metabolic Network, and Element Cycle in the Seawater Environment

Advanced nutrient removal and external sludge reduction: Demonstration in a pilot‐scale sequencing batch reactor

Synergetic effects of pyrrhotite and biochar on simultaneous removal of nitrate and phosphate in autotrophic denitrification system

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