Nitrogen removal in a combined aerobic granular sludge and solid-phase biological denitrification system: System evaluation and community structure

Liu, Yingrui; Wei, Dong; Xu, Weiying; Feng, Rui; Du, Bin; Wei, Qin

doi:10.1016/j.biortech.2019.121504

Cited by 70 publications

(16 citation statements)

References 39 publications

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“…This is corroborated not only by the identification of Nitrosomonas (AOB) at the beginning and end of the process, but as well by the presence of Nitrospira (NOB) throughout the whole operational period. The robustness of the AGS process was confirmed mostly by the stability of NOB in the system, once these bacteria have a higher sensitivity to environmental changes than AOB (de Sousa Rollemberg et al, 2018;Liu et al, 2019). Besides this, the presence of amo and hao enzymes was predicted for all operational phases.…”

Section: Discussionmentioning

confidence: 92%

High Carbon Load in Food Processing Industrial Wastewater is a Driver for Metabolic Competition in Aerobic Granular Sludge

Paulo

Amorim

Costa

et al. 2021

Front. Environ. Sci.

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Aerobic granular sludge (AGS) processes are among the most robust wastewater treatments. One of their greatest advantages is related to the granules multi-layered structure, which creates a protective barrier against organic shock loads and variable wastewater composition, particularly attractive for the treatment of industrial wastewater. However, when treating a wastewater with variable and complex composition, the difficulty in identifying factors that most affect a specific biological process increases. In this study, the effect of organic loading rate (OLR), namely carbon content, on nitrification in an AGS process treating fish canning wastewater was investigated. Besides process performance, also biomass structural changes, and microbial community composition were analysed. Reactor operation lasted for 107 days and was divided in three phases during which different OLR and C/N ratios were applied. A higher OLR was applied during the first two phases (ca. 1.1 and 1.5 kg COD m−3 day−1, respectively) compared to the third phase (between 0.12 and 0.78 kg COD m−3 day−1) and the C/N ratios also varied (ca. 4.4, 7.8, and 2.9, respectively). Throughout the operation, COD concentration in the outlet was lower than 100 mg O2 L−1. Nitrification was inhibited during the second phase and recovered afterwards. Principal component analysis (PCA) of quantitative image analysis (QIA) and performance data allowed to distinguish process changes over the three operational phases. During the first two phases, the decrease in the biomass robustness occurred, but recovered during the last phase, indicating that the high content of organic matter had possibly an effect on the aerobic granules structural characteristics. The composition of the AGS microbiome did not change substantially after the end of the higher OLR periods. The main microbial diversity shifts were mostly associated to adaptation to higher or lower carbon availability. Bacteria and inferred enzymes associated to nitrogen and phosphorous removal were identified. Chryseobacterium, a bacterium with high metabolic versatility, was able to adapt to the organic shock load, becoming dominant over operation. Despite the variable composition of the fish canning wastewater, carbon was identified as the main driver for nitrification inhibition, while promoting changes in the physical characteristics and on the microbial community of granules.

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Section: Discussionmentioning

confidence: 92%

High Carbon Load in Food Processing Industrial Wastewater is a Driver for Metabolic Competition in Aerobic Granular Sludge

Paulo

Amorim

Costa

et al. 2021

Front. Environ. Sci.

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“…Among the dominant genera, Hydrogenophaga, which is among a group of bacteria capable of nitrogen removal, was widely present in activated sludge. It plays an important role in enhancing the removal of nitrogen-containing pollutants and exhibits a good removal efficiency of NH 4 + -N. 96 Furthermore, Micropruina and Nakamurella, which are capable of storing glucans, became the dominant bacterial species in the reactor, leading to the predominance of glycogenaccumulating organisms (GAOs) in the system. As a result, PAOs could not uptake the energy required for metabolism and phosphorus removal.…”

Section: Microbial Community Analysismentioning

confidence: 99%

Addition of sodium alginate as a nucleus shortens granulation of aerobic sludge

Tang

Chen

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…As reported previously, Firmicutes can produce endospores to enhance tolerance against environmental stress [ 39 ]. Actinobacteria possess a firmed-structure and higher-adaptability, which could maintain sludge structure [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Seed Sludge Type on Aerobic Granulation, Pollutant Removal and Microbial Community in a Sequencing Batch Reactor Treating Real Textile Wastewater

Zou

Yang

et al. 2022

IJERPH

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The aerobic granulation, pollutant removal, and microbial community in real textile wastewater (TWW) treatment were compared using conventional activated sludge (CAS) and preformed aerobic granular sludge (AGS) in synthetic wastewater as seed in two reactors, reactor-1 (R1) and reactor-2 (R2), respectively. The results showed that complete granulation was achieved in R1 (sludge volume index at 5 min (SVI5) and 30 min (SVI30): 19.4 mL/g; granule size: 210 μm) within 65 days, while it only required 28 days in R2 (SVI5 and SVI30: 27.3 mL/g; granule size: 496 μm). The removal of COD, NH4+-N and TN in R1 (49.8%, 98.8%, and 41.6%) and R2 (53.6%, 96.9%, and 40.8%) were comparable in 100% real TWW treatment, but stable performance was achieved much faster in R2. The real TWW had an inhibitory effect on heterotrophic bacteria activity, but it had no inhibition on ammonia-oxidizing bacteria activity. AGS with a larger particle size had a higher microbial tolerance to real TWW. Furthermore, filamentous Thiothrix in the AGS in R2 disappeared when treating real TWW, leading to the improvement of sludge settleability. Thus, seeding preformed AGS is suggested as a rapid start-up method for a robust AGS system in treating real TWW.

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Nitrogen removal in a combined aerobic granular sludge and solid-phase biological denitrification system: System evaluation and community structure

Cited by 70 publications

References 39 publications

High Carbon Load in Food Processing Industrial Wastewater is a Driver for Metabolic Competition in Aerobic Granular Sludge

High Carbon Load in Food Processing Industrial Wastewater is a Driver for Metabolic Competition in Aerobic Granular Sludge

Addition of sodium alginate as a nucleus shortens granulation of aerobic sludge

Effect of Seed Sludge Type on Aerobic Granulation, Pollutant Removal and Microbial Community in a Sequencing Batch Reactor Treating Real Textile Wastewater

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