Aeration model for submerged membrane bioreactor – Characterization, oxygen transfer rate, pollutant removal, and energy consumption

Sonawane, Amol Vijay; Murthy, Z.V.P.

doi:10.1016/j.cherd.2022.10.019

Cited by 6 publications

(2 citation statements)

References 36 publications

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“…As the solubility of oxygen in water is relatively low, conventional aerators operate continuously to maintain supersaturated conditions, thereby improving the performance of gas‐starving and gas‐diffusion controlled processes. [ 52 ] Figure a demonstrates the long‐term stability of oxygen‐supersaturated solutions under open system conditions, comparing NBs and MBs solutions with similar initial dissolved oxygen value of 37 mg L −1 O 2 . When 100 mL of supersaturated solutions is maintained under continuous stirring in an open system, solutions will return to equilibrium conditions.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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

Magdaleno,

Cerrón‐Calle,

dos Santos

et al. 2023

Small

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“…RO, FO, nanofiltration (NF), UF, other membrane technologies, and their combinations are widely used in seawater desalination and advanced wastewater treatment. In the water treatment process, the energy consumption of the membrane module accounts for 37.66–52.20% of the total energy consumption. , The energy consumption components of membrane technology include pretreatment, aeration/power, washing/backwashing and other processes, among which filtration (transmembrane pressure), backwashing time and aeration rate are the parameters that have the greatest impact on energy consumption. ,, Table and Figure show the energy consumption of common membrane technologies and the proportional energy consumption of different process segments. For the membrane bioreactor (MBR) process, the specific energy consumption of the filtration process is far lower than 75% of microfiltration (MF), UF, NF, and RO, and aeration is the main source of energy consumption.…”

Section: Paths For Reducing the Carbon Emissions Of Membrane Technologymentioning

confidence: 99%

Carbon Emission Calculations and Reductions in Membrane Water Treatment: A Review

Li,

Duan,

et al. 2023

ACS EST Water

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Membrane technology has become a key common technology to solve major problems in the fields of global water resources, energy, and the environment and is one of the most developed high-tech methods in the 21 st century. However, due to the high cost and low reuse rate of membrane technology, its energy consumption and carbon footprint are still high, which is the main factor limiting its use. Therefore, we need to clarify the method used to calculate greenhouse gas emissions from this technology and put forward effective emission reduction programs. Based on the life cycle assessment method, the accounting boundary of greenhouse gas emissions from membrane technology is defined. According to this boundary, the greenhouse gas emissions in the whole life cycle of membrane technology are divided into direct emissions, indirect emissions, and carbon compensation, and the measured emission factor method is used to calculate the greenhouse gas emissions. Then, we discuss the effective pathways for reducing carbon emissions by this technology: (1) reduce energy consumption by optimizing operating conditions and coupling membrane systems with clean energy; (2) recover and utilize organic matter byproducts and recycled water; and (3) recycle waste membrane components in whole or in part. Studies have found that membrane technology can overcome its current challenges and even achieve net zero emissions under a recycling scheme, but quantitative data are still lacking. Finally, we hope to provide a valuable reference for carbon emission accounting and carbon emission reduction in studies of membrane technology.

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Rotate Instead of Aerate More: The Rotating Hollow Fibre Membrane Bioreactor

Mahdariza,

Georg,

Pronold

et al. 2024

Lecture Notes in Civil Engineering

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Aeration model for submerged membrane bioreactor – Characterization, oxygen transfer rate, pollutant removal, and energy consumption

Cited by 6 publications

References 36 publications

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

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

Carbon Emission Calculations and Reductions in Membrane Water Treatment: A Review

Rotate Instead of Aerate More: The Rotating Hollow Fibre Membrane Bioreactor

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