Effect of air nanobubbles on oxygen transfer, oxygen uptake, and diversity of aerobic microbial consortium in activated sludge reactors

Yaparatne, Sudheera; Doherty, Zachary E.; Magdaleno, Andre L.; Matula, Emily E.; MacRae, Jean D.; Garcia‐Segura, Sergi; Apul, Onur G.

doi:10.1016/j.biortech.2022.127090

Cited by 35 publications

(16 citation statements)

References 32 publications

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“…76,84 More recently, Yaparatne et al compared the performance between conventional aeration and in situ NBaeration in ASP. 102 Compared to macrobubble-aeration, NBaeration provided higher DO levels, reduced the abundance of filamentous bacteria and yielded 10% higher chemical oxygen demand (COD) removal. 102 However, NB-aeration also exerted selective pressure on microbial community structure and resulted in poor sludge settleability with a lower relative abundance of floc-forming bacteria (such as Corynebacterium, Pseudomonas, and Zoogloea).…”

Section: Aerobic Biological Wastewater Treatmentmentioning

confidence: 99%

“…102 Compared to macrobubble-aeration, NBaeration provided higher DO levels, reduced the abundance of filamentous bacteria and yielded 10% higher chemical oxygen demand (COD) removal. 102 However, NB-aeration also exerted selective pressure on microbial community structure and resulted in poor sludge settleability with a lower relative abundance of floc-forming bacteria (such as Corynebacterium, Pseudomonas, and Zoogloea). 102 The above findings suggest that the current generation process of MBs and NBs may adversely affect the sludge flocs, and further efforts are thus required, especially with respect to developing new MBs and NBs generation/delivery methods and novel reactor configurations.…”

Section: Aerobic Biological Wastewater Treatmentmentioning

confidence: 99%

“…102 However, NB-aeration also exerted selective pressure on microbial community structure and resulted in poor sludge settleability with a lower relative abundance of floc-forming bacteria (such as Corynebacterium, Pseudomonas, and Zoogloea). 102 The above findings suggest that the current generation process of MBs and NBs may adversely affect the sludge flocs, and further efforts are thus required, especially with respect to developing new MBs and NBs generation/delivery methods and novel reactor configurations. For example, Xiao et al generated NBs in synthetic influent and examined the effects of air-NBs on microbial aggregates in the integrated fixed-film activated sludge reactors (operated in sequencing batch mode).…”

Section: Aerobic Biological Wastewater Treatmentmentioning

confidence: 99%

“…The air-MBs were found to attach to sludge flocs, resulting in poor sludge settleability and biomass wash-out from the aeration tank . These detrimental effects on activated sludge matrixes were mainly attributed to the disruption of sludge flocs caused by the strong shear force of the liquid circulation pump for MB generation. , More recently, Yaparatne et al compared the performance between conventional aeration and in situ NB-aeration in ASP . Compared to macrobubble-aeration, NB-aeration provided higher DO levels, reduced the abundance of filamentous bacteria and yielded 10% higher chemical oxygen demand (COD) removal .…”

Section: Applications Of Mbs and Nbs In Wastewater Treatmentmentioning

confidence: 99%

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Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

et al. 2022

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Microbubbles (MBs) and nanobubbles (NBs) refer to bubbles of micrometer to nanometer sizes. Due to several unique attributes, including long-term stability, negative surface charge, and the ability to generate reactive oxygen species, MB and NB technology has garnered significant attention in water and wastewater treatment and ecological restoration. Recently, several studies have shown the beneficial effects of MBs and NBs in membrane defouling, pathogen deactivation, environmental remediation, etc. However, there is limited knowledge of the physical and biochemical interactions between MBs and NBs and microbial communities; the mechanistic roles of MBs and NBs on micropollutants removal during aerobic wastewater treatment and anaerobic digestion; and the engineering limitations on versatility and scalability of MB and NB technology, among others. This review fills this gap by providing a systematic discussion on the fundamentals of MBs and NBs, including their size and concentration, physicochemical properties, and generation methods. The latest advances on MB and NB applications to water and wastewater treatment and ecological restoration are then critically discussed. The review thus identifies the challenges of implementing MB and NB technology and concludes with future research directions for a broader understanding of MB and NB technology.

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Section: Aerobic Biological Wastewater Treatmentmentioning

confidence: 99%

Section: Aerobic Biological Wastewater Treatmentmentioning

confidence: 99%

Section: Aerobic Biological Wastewater Treatmentmentioning

confidence: 99%

Section: Applications Of Mbs and Nbs In Wastewater Treatmentmentioning

confidence: 99%

See 2 more Smart Citations

Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

et al. 2022

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“…The NB can extend the higher surface-to-volume ratio, improve the floatation of the particles, and clean the surfaces and pores (Holmberg et al, 2003;Li et al, 2014). In addition, owing to the large surface area and lack of buoyancy in solution, NBs have a great potential to reduce oxygen loss during aeration of biological processes (Yaparatne et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Efficient Wastewater Treatment via Aeration Through a Novel Nanobubble System in Sequence Batch Reactors

et al. 2022

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The aerobic wastewater treatments depend on the aeration. Hence, the size of the bubbles used in the aeration system may play a crucial role in this regard. This study attempted to investigate the effects of aeration bubble size on wastewater treatment efficiency of a “sequence batch reactor” (SBR) system at a laboratory scale using a novel designed fine/nanobubble forming instrumentation system. Based on the presence of microorganisms in the stationary phase, chemical oxygen demand removal efficiency on the 15th day (80.0 and 95.0%) was majorly better than on the 10th and 15th days in fine and nanobubble aeration systems. Moreover, with increasing sludge age, the “sludge volumetric index” (SVI) increased up to 170.0 ml g−1 on the 15th day. In addition, sludge rate and F/M ratio were much higher and expressively less in the nanobubble system rather than in the fine-bubbles system in which sludge was majorly denser. Therefore, the sludge was more easily deposited and the percentage of dry sludge was higher compared with the fine-bubble system. Thus, oxygen and specific oxygen uptake rate consumption were significantly reduced. The efficiency of the phosphorus removal was estimated to be between 54.0–60.0% for nanobubble aeration, compared to the general systems such as the SBR (10–20%) under similar conditions. In addition, the efficiency of the nitrogen removal in the nanobubble aeration system with different densities of 40.0, 50.0, and 60.0 ml g−1 was found as 99.0%, relatively higher compared to fine bubble with 96.0% nitrogen efficiency. In conclusion, a nanobubble aeration system could give considerably promoted efficiencies in all terms of the tested treatment effective parameters.

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Unlocking the Potential of Nanobubbles: Achieving Exceptional Gas Efficiency in Electrogeneration of Hydrogen Peroxide

Magdaleno,

Cerrón‐Calle,

dos Santos

et al. 2023

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The electrogeneration of hydrogen peroxide (H2O2) via the oxygen reduction reaction is a crucial process for advanced water treatment technologies. While significant effort is being devoted to developing highly reactive materials, gas provision systems used in these processes are receiving less attention. Here, using oxygen nanobubbles to improve the gas efficiency of the electrogeneration of H2O2 is proposed. Aeration with nanobubbles is compared to aeration with macrobubbles under an identical experimental set‐up, with nanobubbles showing a much higher gas–liquid volumetric mass transfer coefficient (KLa) of 2.6 × 10−2 min−1 compared to 2.7 × 10−4 min−1 for macrobubbles. Consequently, nanobubbles exhibit a much higher gas efficiency using 60% of O2 delivered to the system compared to 0.19% for macrobubbles. Further, it is observed that the electrogeneration of H2O2 using carbon felt electrodes is enhanced using nanobubbles. Under the same dissolved oxygen levels, nanobubbles boost the reaction yield to 84%, while macrobubbles yield only 53.8%. To the authors’ knowledge, this is the first study to investigate the use of nanobubbles in electrochemical reactions and demonstrate their ability to enhance gas efficiency and electrocatalytic response. These findings have important implications for developing more efficient chemical and electrochemical processes operating under gas‐starving systems.

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Effect of air nanobubbles on oxygen transfer, oxygen uptake, and diversity of aerobic microbial consortium in activated sludge reactors

Cited by 35 publications

References 32 publications

Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

Efficient Wastewater Treatment via Aeration Through a Novel Nanobubble System in Sequence Batch Reactors

Unlocking the Potential of Nanobubbles: Achieving Exceptional Gas Efficiency in Electrogeneration of Hydrogen Peroxide

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