Aerating a High Rate Low SRT Activated Sludge Reactor: Coarse or Fine Bubble Aeration---How About a Hybrid?

Frank, Kevin; Davies, Grant; Shirodkar, Nikhil; Sauvageau, Alan

doi:10.2175/193864709793957382

proc water environ fed

2009

DOI: 10.2175/193864709793957382

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Aerating a High Rate Low SRT Activated Sludge Reactor: Coarse or Fine Bubble Aeration---How About a Hybrid?

Kevin Frank¹,

Grant Davies²,

Nikhil Shirodkar³

et al.

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“…Submerged aeration, such as jet aeration and coarse or fine bubble aeration, provides oxygen via air bubble release at the bottom of the aeration tanks (Frank et al, 2009).…”

mentioning

confidence: 99%

Characteristics and formation mechanism of intestinal bacteria particles emitted from aerated wastewater treatment tanks

Wang

Xue

et al. 2019

Water Research

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Aeration tanks in municipal wastewater treatment plants (WWTPs) are regarded as sources of bioaerosols, often containing particles and microbes. In this study, intestinal bacteria were investigated from biochemical reaction tanks (BRTs) of six municipal WWTPs. It was observed that 86 CFU/m 3 of intestinal bacteria (in average) occurred in the BRTs installed surface aerator, which was higher than those adopted submerged aeration (67 CFU/m 3 in average). 62.72% of fine particles were observed in the BRTs supplied oxygen by submerged aerator, while 75.73% of coarse particles emitted during surface aeration. Pseudomonas sp., Serratia sp. and Acinetobacter sp. were identified as pathogenic bacteria presented in the intestinal bacteria population and most of them existed initially in water or sludge, particularly in water surface. The emission level and particle size distribution were significantly correlated with aeration mode adopted by the WWTPs. The bioaerosols particles emitted from surface aeration process was higher than that from submerged aeration process. Meanwhile, the BRTs with submerged aerators released more fine particles, which can get into the alveoli and represented the potential challenge to human health. Canonical correspondence analysis results exhibited that population of intestinal bacteria had a positive correlation with aeration rate and water quality. As the intestinal bacteria in the bioaerosols emitted from the WWTPs may pose a potential risk to onsite operators, aeration tanks in WWTPs should be paid more attention as a source of intestinal bacterial emissions.

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“…Submerged aeration, such as jet aeration and coarse or fine bubble aeration, provides oxygen via air bubble release at the bottom of the aeration tanks (Frank et al, 2009).…”

mentioning

confidence: 99%

Characteristics and formation mechanism of intestinal bacteria particles emitted from aerated wastewater treatment tanks

Wang

Xue

et al. 2019

Water Research

View full text Add to dashboard Cite

show abstract

Composition, dispersion, and health risks of bioaerosols in wastewater treatment plants: A review

Han

Wang

et al. 2020

Front. Environ. Sci. Eng.

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Aerating a High Rate Low SRT Activated Sludge Reactor: Coarse or Fine Bubble Aeration---How About a Hybrid?

Cited by 2 publications

References 0 publications

Characteristics and formation mechanism of intestinal bacteria particles emitted from aerated wastewater treatment tanks

Characteristics and formation mechanism of intestinal bacteria particles emitted from aerated wastewater treatment tanks

Composition, dispersion, and health risks of bioaerosols in wastewater treatment plants: A review

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