A Long-Term Assessment of Nitrogen Removal Performance and Microecosystem Evolution in Bioretention Columns Modified with Sponge Iron

The nitrogen removal performance of bioretention urgently needs to be improved, and sponge iron has great potential to address this challenge. This study reported the results of a long-term investigation on bioretention columns improved by sponge iron, examining the durability of sponge iron from ni...

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Bibliographic Details
Published in:Toxics (Basel) 2024-10, Vol.12 (10), p.727
Main Authors: Lin, Zizeng, Shi, Qinghuan, He, Qiumei
Format: Article
Language:English
Subjects:
Adaptability
Adsorption
Ammonia
Bacteria
Biological effects
Biological evolution
Biological properties
bioretention
Carbon
Chemical oxygen demand
Contamination
Denitrification
Efficiency
Environmental aspects
Enzymatic activity
Enzyme activity
Iron
long-term operation
microecosystem
Microorganisms
Nitrates
Nitrogen
Nitrogen removal
Physiology
Plant layout
Plant species
Pollutants
Pollution effects
Rain
Rain gardens
Reactive oxygen species
Sponge iron
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Summary:The nitrogen removal performance of bioretention urgently needs to be improved, and sponge iron has great potential to address this challenge. This study reported the results of a long-term investigation on bioretention columns improved by sponge iron, examining the durability of sponge iron from nitrogen removal performance, sponge iron properties, and the evolution of biological elements. The results showed that after 9 months of continuous operation, the removal rates of ammonia nitrogen (NH -N), nitrate nitrogen (NO -N), and total nitrogen (TN) in the bioretention columns with an appropriate proportion of sponge iron could reach 80% (some even over 90%). However, the long-term stress of sponge iron exposure, combined with the cumulative effect of pollutants, might lead to the excessive accumulation of reactive oxygen species (ROS) in plants, thereby posing risks of diminished chlorophyll content and enzyme activity. Simultaneously, the extended exposure could also have detrimental effects on microbial diversity and the abundance of dominant bacteria such as and . Therefore, it is necessary to select plant species and functional genes that demonstrate high adaptability to iron-induced stress.
ISSN:2305-6304
2305-6304
DOI:10.3390/toxics12100727