Abstract
As a critical air dissolving system, the performance of air flotation equipment directly determines the adhesion efficiency and pollutant removal efficiency of air flotation processes. The factors affecting the performance of air flotation equipment and the relationships between equipment performance and pollution removal efficiency were studied. The results show that when the dissolved gas pressure was 0.4 MPa and the air intake rate was 24 mL/min, the dissolved gas efficiency of the equipment reached its highest value of 55%, the average particle size of bubbles was maintained at 24 µm, and the dissolved oxygen (DO) content significantly increased. When the dissolved gas pressure was 0.4 MPa, the air intake rate was 24 mL/min, and the coagulant dose was 6 mg/L; the removal rates for turbidity, chlorophyll-a, total organic carbon (TOC), and UV absorbance at 254 nm (UV254) reached 95.76%, 96.41%, 34.21%, and 65.96%, respectively. The degree of pollutant removal was positively correlated with changes to the equipment performance parameters. Microbubbles (MBs) showed good removal of high-molecular weight, strongly hydrophobic organic matter and showed some removal of the trihalomethane formation potential (THMFP) of the water. The removal mechanism mainly depended on the hydrophobic interactions of the MBs with algae and organic matter. The flocs and MBs collided and adhered to form air-entrained flocs. The separation of air-entrained flocs depended on the relationship between the surface load and the rising velocity. The surface load has to be lower than the rising velocity of the minimum air-entrained flocs to ensure good effluent outcomes.
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The datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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This work was financially supported by the Natural Science Foundation of Shandong Province (ZR2020ME221) and the Weifang Science and Technology Development Plan Project (2020ZJ1320).
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All authors contributed to the study’s conception and design. WYL provided experimental ideas and designed the experiments. MHY completed the data collation and data analysis. JL and LJJ completed the first draft of the manuscript. TLP, HGL, and WXB prepared the experimental materials and equipment. QH and YHY revised the article. All authors read and approved the final manuscript.
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Wang, Y., Ma, H., Wang, X. et al. Study on the operation performance and floc adhesion mechanism of dissolved air flotation equipment. Environ Sci Pollut Res 29, 54219–54233 (2022). https://doi.org/10.1007/s11356-022-19359-9
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DOI: https://doi.org/10.1007/s11356-022-19359-9