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  • Title: A sulfur-limestone bioretention system for stormwater treatment: Nitrogen removal performance and microbial community.
    Author: Wang F, Li J, Duan H.
    Journal: Sci Total Environ; 2022 Jun 25; 827():154301. PubMed ID: 35257763.
    Abstract:
    A lab-scale sulfur-limestone based bioretention system with a submerged zone was used to remove nitrate-nitrogen (NO3--N) from stormwater. The results indicated that denitrification mainly occurred during the first 5 d of drying period. With the NO3--N concentration in the influent increasing from 20 to 50 mg/L, after 5 d of drying period 93.99-97.26% NO3--N was removed, and the effluent sulfate (SO42-) concentration ranged from 170.28 to 359.87 mg/L. When the NO3--N content in the influent was lower than 30 mg/L, the effluent SO42- concentration met the Chinese Quality Standard for Ground Water (GB/T 14848-2017). Compared with the woodchips bioretention, there was no organic matter leakage problem. Sulfur autotrophic denitrification process followed first-order kinetic model, and the reaction kinetic parameters (k) were 0.7392-1.1472 d-1. The dominant genera in the submerged zone were Thiobacillus and Halothiobacillus (>63.69%) which participated in the sulfur autotrophic denitrification process.
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