Impact of seed sludge characteristics on granulation and performance of aerobic granular sludge process

Kosar, Sadiye; Isik, Onur; Akdag, Yasemin; Gülhan, Hazal; Koyuncu, İsmail; Özgün, Hale; Erşahin, Mustafa Evren

doi:10.1016/j.jclepro.2022.132424

Cited by 24 publications

(5 citation statements)

References 29 publications

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“…The average sizes of R1-Low in both stages were higher than R2-High, which might also contribute to the lower nitrification rate in R1-Low. It was because a lower air flow rate led to larger anoxic/anaerobic regions in the inner granules in R1-Low and less O 2 transfer from the surface to the core (Kosar et al 2022). In Stage 2, the sizes of granules in R2-High were smaller than in R1-Low at the beginning and became larger over time.…”

Section: Resultsmentioning

confidence: 99%

Insight into the Impact of Air Flow Rate on Algal-Bacterial Granules: Reactor Performance, Hydrodynamics by Computational Fluid Dynamics (CFD) and Microbial Community Analysis

Zhang,

El-Sayed,

Zhang

et al. 2024

Preprint

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Algal-bacterial granules have been drawing attention in wastewater treatment due to their rapid settling ability and efficient nutrient removal performance. This study evaluated the impact of air flow rates on nitrogen removal and the formation of algal-bacterial granules in domestic wastewater treatment. The highest nitrogen removal efficiency was achieved by operating with two separate feedings and the addition of an external carbon source. The higher air flow rate resulted in a higher nitrification rate and produced smaller and more compact granules on average. However, increasing the air flow rate did not necessarily increase extracellular polymeric substances (EPS) production. Computational Fluid Dynamics (CFD) simulations revealed that mechanical mixing was the primary source of shear force. Increasing the air flow rate from 0.2 LPM to 0.5 LPM only yielded a 12% increment in the volume-averaged strain rate. Further analysis of microbial communities showed that changes in bioreactor operation, especially sodium acetate addition and aerations, shifted the microbial community composition. The sodium acetate addition led to the increase of microbial diversity and the relative abundance of denitrifiers such as Thauera, while the aeration caused the increasing relative abundances of nitrogen-related genera (such as Nitrospira) and the decreasing relative abundances of cyanobacteria and Chlorella in the long-term operation of the photobioreactors. Moreover, the decrease in total abundance of grazers and pathogens along with the operation, including Chytridiomycetes, Sessilida, and Operculariidae, might result from the shear force and the decrease of prokaryotic species, such as Chlorella spp..

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Section: Resultsmentioning

confidence: 99%

Insight into the Impact of Air Flow Rate on Algal-Bacterial Granules: Reactor Performance, Hydrodynamics by Computational Fluid Dynamics (CFD) and Microbial Community Analysis

Zhang,

El-Sayed,

Zhang

et al. 2024

Preprint

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“…Due to the different properties and characteristics of AGS, the processes currently used must be tested, checked for their functional suitability, and finally optimised to ensure the expected technological effectiveness of the anaerobic stabilisation of sewage sludge [12,13]. The process units and technological parameters of the methane fermentation process should be adapted to a substrate with a slightly different chemical composition, structure, and properties.…”

Section: Introductionmentioning

confidence: 99%

Application of Hydrodynamic Cavitation in the Disintegration of Aerobic Granular Sludge—Evaluation of Pretreatment Time on Biomass Properties, Anaerobic Digestion Efficiency and Energy Balance

Zieliński,

Dębowski,

Kazimierowicz

et al. 2024

Energies

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The use of aerobic granular sludge is a promising and future-proof solution for wastewater treatment. The implementation of this technology requires the development of efficient and cost-effective methods for the management of excess sludge. The aim of the research was to evaluate the effects of hydrodynamic cavitation on the efficiency of aerobic granular sludge digestion. Respirometric measurements were performed at a temperature of 38 °C and an initial organic load of 5.0 gVS/L. The changes in the properties of the pretreated biomass, the kinetics of methane fermentation, the amount and composition of the biogas produced, and an energetic evaluation of the process were carried out. A significant influence of hydrodynamic cavitation on the transfer of organic compounds into the dissolved phase was demonstrated. The degree of solubilisation was 37% for COD and 42% and for TOC. The efficiency of CH4 production from the pretreated sludge reached a value of 496 ± 12 mL/gVS, which corresponds to an increase of 19.6% compared to the raw biomass. The influence of cavitation on the CH4 content of the biogas was not observed. Strong correlations were found between the efficiency of anaerobic digestion and the concentration of dissolved organic compounds and the hydrodynamic cavitation time used. The gross energy yield was closely correlated with the amount of CH4. The highest comparable values of 3.12 Wh/gTS to 3.18 Wh/gTS were found in the variants in which the hydrodynamic cavitation (HC) time was between 15 min and 50 min. The highest net energy production of 2890 kWh/MgTS was achieved after 15 min of pretreatment.

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“…Research on biological wastewater treatment is currently directed toward resource recovery (Franca et al 2018 ; Guven et al 2023 ). Aerobic granular sludge (AGS) technology, an innovative technology that permits simultaneous carbon and nutrient removal, has been increasingly used for municipal wastewater treatment (de Bruin et al 2004 ; de Kreuk et al 2007 ; Winkler et al 2015 ; Kosar et al 2022a ; Cicekalan et al 2023 ). Compared to conventional activated sludge processes using flocculent sludge, the AGS process provides better settling ability and higher biomass retention having the ability to withstand high-strength wastewater and shock load (Zheng et al 2005 ).…”

Section: Introductionmentioning

confidence: 99%

Impact of food waste addition in energy efficient municipal wastewater treatment by aerobic granular sludge process

Cicekalan,

Berenji,

Aras

et al. 2024

Environ Sci Pollut Res

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Recently, one of the main purposes of wastewater treatment plants is to achieve a neutral or positive energy balance while meeting the discharge criteria. Aerobic granular sludge (AGS) technology is a promising technology that has low energy and footprint requirements as well as high treatment performance. The effect of co-treatment of municipal wastewater and food waste (FW) on the treatment performance, granule morphology, and settling behavior of the granules was investigated in the study. A biochemical methane potential (BMP) test was also performed to assess the methane potential of mono- and co-digestion of the excess sludge from the AGS process. The addition of FW into wastewater enhanced the nutrient treatment efficiency in the AGS process. BMP of the excess sludge from the AGS process fed with the mixture of wastewater and FW (195 ± 17 mL CH4/g VS) was slightly higher than BMP of excess sludge from the AGS process fed with solely wastewater (173 ± 16 mL CH4/g VS). The highest methane yield was observed for co-digestion of excess sludge from the AGS process and FW, which was 312 ± 8 mL CH4/g VS. Integration of FW as a co-substrate in the AGS process would potentially enhance energy recovery and the quality of effluent in municipal wastewater treatment. Graphical abstract

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Impact of seed sludge characteristics on granulation and performance of aerobic granular sludge process

Cited by 24 publications

References 29 publications

Insight into the Impact of Air Flow Rate on Algal-Bacterial Granules: Reactor Performance, Hydrodynamics by Computational Fluid Dynamics (CFD) and Microbial Community Analysis

Insight into the Impact of Air Flow Rate on Algal-Bacterial Granules: Reactor Performance, Hydrodynamics by Computational Fluid Dynamics (CFD) and Microbial Community Analysis

Application of Hydrodynamic Cavitation in the Disintegration of Aerobic Granular Sludge—Evaluation of Pretreatment Time on Biomass Properties, Anaerobic Digestion Efficiency and Energy Balance

Impact of food waste addition in energy efficient municipal wastewater treatment by aerobic granular sludge process

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