Influence of urban runoff pollutant first flush strength on bioretention pollutant removal performance

Bioretention is commonly used for runoff pollution control. The first flush strength of pollutants can affect bioretention performance. To examine the influence of the first flush strength on bioretention performance, bioretention columns filled with garden soil as the main media were established. A...

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Bibliographic Details
Published in:Water science and technology 2022-09, Vol.86 (6), p.1478-1495
Main Authors: Zhang, Wei, Tao, Kexin, Sun, Huichao, Che, Wu
Format: Article
Language:English
Subjects:
Activated carbon
bioretention
Carbon
carbon source
Carbon sources
Chemical oxygen demand
Columns (structural)
Culture media
first flush
Fungi
Inflow
Leaching
Mushrooms
Nitrates
Nitrogen
Outflow
Oxygen requirement
Phosphorus
Phosphorus removal
Pollutant removal
Pollutants
Pollution control
Removal
Retention basins
Runoff
Solid suspensions
Stormwater management
Strength
Suspended particulate matter
Suspended solids
Urban runoff
waste edible fungus culture medium
Water treatment
water treatment residuals
Wood chips
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Summary:Bioretention is commonly used for runoff pollution control. The first flush strength of pollutants can affect bioretention performance. To examine the influence of the first flush strength on bioretention performance, bioretention columns filled with garden soil as the main media were established. Activated carbon and water treatment residuals (WTR) were added and compared for their ability to enhance phosphorus removal. Waste edible fungus culture medium (WEFCM) as a carbon source was also explored. When WEFCM was used as a carbon source instead of wood chips, total nitrogen (TN) removal increased from 60.83 ± 21.22 to 62.21 ± 16.43%, but chemical oxygen demand (COD) leaching was observed. WTR was better able than activated carbon to enhance phosphorus removal (87.97 ± 8.87 vs. 81.66 ± 9.27%) without impacting TN removal. NH4+-N removal increased with increasing first flush strength, but there was no trend for suspended solids (SS), COD, TN, or total phosphorus. First leaching phenomenon in bioretention outflow was proposed in this study. A low first leaching was observed in the outflow when the inflow had a uniform pollutant mass (i.e., no first flush) because of media leaching. A weak first leaching outflow was observed for SS and COD when they were present at strong first flush inflow.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2022.275