Journal
BIORESOURCE TECHNOLOGY
Volume 351, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127090
Keywords
Aeration; Fine bubble; Wastewater treatment; Microbial community; Dissolved oxygen
Funding
- Maine Space Grant Consortium [EP-22-01]
- U.S. Mission to Turkey [STU15021GR3054]
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Nanobubble aeration showed potential in enhancing aerobic activated sludge treatment by increasing dissolved oxygen levels and improving chemical oxygen demand removal. It also resulted in reduced filamentous bacteria and specific bacterial populations in the sludge.
Nanobubbles have the potential to curtail the loss of oxygen during activated sludge aeration due to their extensive surface areas and lack of buoyance in solution. In this study, nanobubble aeration was explored as a novel approach to enhance aerobic activated sludge treatment and benchmarked against coarse bubble aeration at the lab scale. Nanobubble aerated activated sludge reactors achieved greater dissolved oxygen levels at faster rates. Higher soluble chemical oxygen demand removal by 10% was observed when compared to coarse bubble aeration with the same amount of air. The activated sludge produced compact sludge yielding easier waste sludge for subsequent sludge handling. The samples showed fewer filamentous bacteria with a lower relative abundance of floc forming Corynebacterium, Pseudomonas, and Zoogloea in the sludge. The microbiome of the nanobubble-treated activated sludge showed significant shifts in the abundance of community members at the genus level and significantly lower alpha and beta diversities.
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