Cultivating aerobic granular sludge in a developed continuous-flow reactor with two-zone sedimentation tank treating real and low-strength wastewater

Zou, Jinte; Tao, Yaqiang; Li, Jun; Wu, Shuyun; Ni, Yajuan

doi:10.1016/j.biortech.2017.09.088

Cited by 87 publications

(20 citation statements)

References 35 publications

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“…This indicates that the design and operation of the continuous flow reactor in this study enhanced the growth of granules. A similar concentration of MLVSS was observed by Zou et al, in a continuous flow reactor with a side stream sedimentation tank and kept stable for more than 80 d. 38 The ratio of MLVSS/MLSS in aerobic granules was observed to increase by 30% in the continuous flow reactor and was stable at around 0.7 from day 20 to 30 (Fig. S6 †) which further illustrates a healthy granular sludge system.…”

Section: Characterization Of Aerobic Granules During Continuous Flow supporting

confidence: 85%

Integration of aerobic granulation and UV/H₂O₂ processes in a continuous flow system for the degradation of sulfolane in contaminated water

Khan

Hollman

et al. 2020

Environ. Sci.: Water Res. Technol.

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Section: Characterization Of Aerobic Granules During Continuous Flow supporting

confidence: 85%

Integration of aerobic granulation and UV/H₂O₂ processes in a continuous flow system for the degradation of sulfolane in contaminated water

Khan

Hollman

et al. 2020

Environ. Sci.: Water Res. Technol.

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“…1a) due to hydrogen bond and cation bridging effects between the polysaccharide and protein components [30]. The gel-like EPS fills the void space between adjacent microbial cells, acting as an "adhesive" material that maintains the structural integrity and mechanical stability of the floc; it also provides a protective layer for the embedded microbial biomass against extreme external environmental conditions (for instance, sudden changes in pH or the presence of toxic substances) [31][32][33].…”

Section: Extracellular Enzyme Distribution Patterns Within Activated mentioning

confidence: 99%

Enzyme Recovery from Biological Wastewater Treatment

Liu¹,

Smith²

2020

Waste Biomass Valor

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Enzymes are high value industrial bio-catalysts with extensive applications in a wide range of manufacturing and processing sectors, including the agricultural, food and household care industries. The catalytic efficiency of enzymes can be several orders higher compared to inorganic chemical catalysts under mild conditions. However, the nutrient medium necessary for biomass culture represents a significant cost to industrial enzyme production. Activated sludge (AS) is a waste product of biological wastewater treatment and consists of microbial biomass that degrades organic matter by producing substantial quantities of hydrolytic enzymes. Therefore, enzyme recovery from AS offers an alternative, potentially viable approach to industrial enzyme production. Enzyme extraction from disrupted AS flocs is technically feasible and has been demonstrated at experimental-scale. A critical review of disruption techniques identified sonication as potentially the most effective and suitable method for enzyme extraction, which can be scaled up and is a familiar technology to the water industry. The yields of different enzymes are influenced by wastewater treatment conditions, and particularly the composition, and can also be controlled by feeding sludge with specific target substrates. Nevertheless, hydrolytic enzymes can be effectively extracted directly from waste AS without specific modifications to standard wastewater treatment processes. Purification, concentration and stabilisation/immobilisation techniques can also greatly expand the industrial application and increase the economic value and marketability of enzyme products extracted from AS. Concentrated and purified AS enzymes could readily substitute inorganic and/or commercial bioenzyme catalysts in many industrial applications including, for example, leather processing, and in detergent and animal feed formulation. Enzyme extraction from AS therefore offers significant economic benefits to the Water Industry by recovering valuable resources from wastewater. They can also optimise important waste treatment processes, such as the anaerobic digestion (AD) of sewage sludge, increasing biogas and renewable energy production. The enzyme-extracted sludge exhibits improved treatment properties, such as increased settleability, dewaterability, and anaerobic digestibility for biogas production, assisting sludge management by wastewater treatment plants (WWTPs) and enabling the further utilisation of the residual sludge. Graphic Abstract

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“…Aerobic granular sludge (AGS) is a promising technology that has attracted much attention from researchers because of its excellent settling properties, high biomass retention, small footprint, and potential to remove nitrogen and phosphorus (P) simultaneously 1–3 . Extensive studies have been conducted to better understand the mechanisms of AGS formation and stability 3–6 .…”

Section: Introductionmentioning

confidence: 99%

“…Extensive studies have been conducted to better understand the mechanisms of AGS formation and stability 3–6 . Crystalline nuclei and selection pressure are widely regarded as the two main factors affecting sludge granulation 2,7 . Extracellular polymeric substances (EPS) are also considered to play an important role in AGS formation and stability 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Influence of ferric iron dosing on aerobic granular sludge: granule formation, nutrient removal and microbial community

Zou

Chen

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Three lab‐scale sequencing batch reactors were used to investigate the effects of Fe3+ on aerobic granular sludge (AGS) formation, nutrient removal, and microbial community. RESULTS The addition of 6 and 12 mg Fe3+ L−1 could not shorten the granulation time. However, compared to the reactor without Fe3+ addition (average sludge volume index at 30 min (SVI30) 70.8 mL g−1; stable average particle size 548 μm), the addition of 12 mg Fe3+ L−1 helped improve the physical properties of AGS (average SVI30 57.0 mL g−1; stable average particle size 1067 μm). Furthermore, with 12 mg Fe3+ L−1 addition (Fe3+ to PO43−‐P molar ratio = 1.33), effective removal of NH4+‐N (≤0.5 mg L−1) and PO43−‐P (<1 mg L−1) was achieved. The addition of Fe3+ reduced the microbial diversity and specific activity of heterotrophic bacteria, but promoted the growth of nitrite‐oxidizing bacteria. The growth of particle size not only increased the active biomass ratio and microbial diversity, but alleviated the inhibition effect of Fe3+ on the specific heterotrophic bacteria activity. CONCLUSION The addition of Fe3+ had both negative and positive effects on the formation and stability of AGS. The results will help enrich the understanding of AGS application in nutrient removal and especially that of phosphorus. © 2020 Society of Chemical Industry

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Cultivating aerobic granular sludge in a developed continuous-flow reactor with two-zone sedimentation tank treating real and low-strength wastewater

Cited by 87 publications

References 35 publications

Integration of aerobic granulation and UV/H₂O₂ processes in a continuous flow system for the degradation of sulfolane in contaminated water

Integration of aerobic granulation and UV/H₂O₂ processes in a continuous flow system for the degradation of sulfolane in contaminated water

Enzyme Recovery from Biological Wastewater Treatment

Influence of ferric iron dosing on aerobic granular sludge: granule formation, nutrient removal and microbial community

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Cultivating aerobic granular sludge in a developed continuous-flow reactor with two-zone sedimentation tank treating real and low-strength wastewater

Cited by 87 publications

References 35 publications

Integration of aerobic granulation and UV/H2O2 processes in a continuous flow system for the degradation of sulfolane in contaminated water

Integration of aerobic granulation and UV/H2O2 processes in a continuous flow system for the degradation of sulfolane in contaminated water

Enzyme Recovery from Biological Wastewater Treatment

Influence of ferric iron dosing on aerobic granular sludge: granule formation, nutrient removal and microbial community

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Product

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Integration of aerobic granulation and UV/H₂O₂ processes in a continuous flow system for the degradation of sulfolane in contaminated water

Integration of aerobic granulation and UV/H₂O₂ processes in a continuous flow system for the degradation of sulfolane in contaminated water