Rapid start-up of an aerobic granular sludge system for nitrogen and phosphorus removal through seeding chitosan-based sludge aggregates

Zou, Jinte; Yu, Fengfan; Pan, Jiyang; Pan, Bingjun; Wu, Shuyun; Qian, Mengjie; Li, Jun

doi:10.1016/j.scitotenv.2020.144171

Cited by 36 publications

(8 citation statements)

References 43 publications

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“…In addition, during this process, the irregularly shaped sludge is gradually transformed into regular dense granules. This phenomenon corresponds to a gradual decrease from 61.72 mL/g to 41.25 mL/g of the SVI 30 value and is consistent with the previous experimental phenomena (Zou et al 2021). As shown in Fig.…”

Section: The Biomass Retention and Settling Ability Of Agssupporting

confidence: 92%

“…4 (a) that the AGS system had good removal characteristics on NH 4 + -N, and it was almost completely transformed during the whole operation period. It was because the entire process was aerated except for the in uent, and a large amount of NH 4 + -N was consumed by microorganisms under high dissolved oxygen for a long time, which was consistent with other studies (Zou et al 2021). As shown in Fig.…”

Section: Nutrient Removal Performancessupporting

confidence: 90%

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Aerobic granular sludge treatment of piggery wastewater: solution to the problem of non-filamentous bulking and analysis of microbial community structure in practical application.

Zhou,

Wang,

Zhou

et al. 2023

Preprint

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In this study, actual piggery wastewater was treated by aerobic granular sludge (AGS) in a sequencing batch reactor (SBR) and verified its treatment capacity. At the same time, the non-filamentous bulking was controlled through a series of measures. The results showed that on the 13th day of operation, the AGS was formed with a particle size of 611.4 µm. The highest removal rates of ammonia nitrogen (NH4+-N), chemical oxygen demand (COD), total nitrogen (TN), and total phosphorous (TP) by the AGS were 99%, 99%, 90%, and 96%, respectively. After 32 days of reactor operation, an overgrowth of zoogloea led to increased polysaccharides (PS) secretion from the extracellular polymeric substances (EPS), resulting in a non-filamentous bulking. Adjusting the carbon source concentration to change the organic loading rate (OLR) in SBR, which increased from 4 kg COD m3·d− 1 to 16 kg COD m3·d− 1, then decreased to 5.6 kg COD m3·d− 1, this value is considered suitable for the long-term growth of AGS. During this period, the non-filamentous bulking was solved by reducing water temperature, increasing hydraulic shear force and selective pressure, and manual screening. Finally, the sludge bulking was reduced on the 60th day. The experimental results indicated that the sludge bulking has little effect on the removal of COD by AGS, but has a significant impact on the nitrogen and phosphorus removal effect. In the process of sludge granulation, species diversity, and microbial biomass in the sludge decreased, especially before and after controlling sludge bulking, and dominant microbial species changed significantly.

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Section: The Biomass Retention and Settling Ability Of Agssupporting

confidence: 92%

Section: Nutrient Removal Performancessupporting

confidence: 90%

Aerobic granular sludge treatment of piggery wastewater: solution to the problem of non-filamentous bulking and analysis of microbial community structure in practical application.

Zhou,

Wang,

Zhou

et al. 2023

Preprint

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“…Mariniflexile, a bacterium mostly found in saline water, might have been already present in the inoculum, a biomass previously adapted to fish canning wastewater. Brevundimonas is an aerobic oligotrophic bacteria, which can establish bacteria-algal associations, being previously identified in AGS biomass (Wang et al, 2020;Zou et al, 2021). The increase in relative abundance of several bacterial genera at the end of operation, namely of Ralstonia, Brevundimonas, Gemmatimonas, Aquabacterium, and Chryseolinea, might be related with a greater ability to survive in conditions with lower organic matter and nutrients availability.…”

Section: Discussionmentioning

confidence: 88%

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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“…Aerobic granular sludge (AGS) has been extensively studied in recent years for municipal and industrial wastewater treatment [ 5 , 6 ]. Compared to conventional activated sludge (CAS), AGS features a number of advantages such as more compact microbial structure, higher biomass content, better settling performance, and the ability to withstand a higher organic loading rate (OLR) and toxic pollutants [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

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

Self Cite

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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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Rapid start-up of an aerobic granular sludge system for nitrogen and phosphorus removal through seeding chitosan-based sludge aggregates

Cited by 36 publications

References 43 publications

Aerobic granular sludge treatment of piggery wastewater: solution to the problem of non-filamentous bulking and analysis of microbial community structure in practical application.

Aerobic granular sludge treatment of piggery wastewater: solution to the problem of non-filamentous bulking and analysis of microbial community structure in practical application.

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