Assessment on the cumulative effect of pollutants and the evolution of micro-ecosystems in bioretention systems with different media
Bioretention system is one of the most used green stormwater infrastructures (GSI), and its media is a key factor in reducing runoff water volume and purifying water quality. Many studies have investigated media improvement to enhance the pollutant removal capacity. However, the long-term cumulative...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651321010691 |
| _version_ | 1818723417901236224 |
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| author | Zhaoxin Zhang Jiake Li Yajiao Li Dongqi Wang Jingyu Zhang Lingzhi Zhao |
| author_facet | Zhaoxin Zhang Jiake Li Yajiao Li Dongqi Wang Jingyu Zhang Lingzhi Zhao |
| author_sort | Zhaoxin Zhang |
| collection | DOAJ |
| description | Bioretention system is one of the most used green stormwater infrastructures (GSI), and its media is a key factor in reducing runoff water volume and purifying water quality. Many studies have investigated media improvement to enhance the pollutant removal capacity. However, the long-term cumulative effect and microbial effect of pollutants in the modified-media bioretention system is less known. This study investigated the cumulative effect of pollutants and their influence on microbial characteristics in conventional and modified media bioretention system. The addition of modifiers increased the background content of pollutants in the media, and the accumulation of pollutants in planting soil (PS) and bioretention soil mixing + water treatment residuals (BSM+WTR) was relatively higher after the simulated rainfall experiment. The accumulation of pollutants led to a decrease in dehydrogenase activity, and an increase in urease and invertase activities. Ten dominant bacterial species at the phylum level were found in all bioretention systems. The relative abundances of the bacteria with good viability under low nutritional conditions decreased, while the species which could live in the pollutant-rich environment increased. The accumulation of pollutants in the bioretention system led to the extinction of some functional microorganisms. The better the effects of modified media on pollutant removal showed, the more obvious effect on the media micro-ecosystem was. To ensure the long-term efficient and stable operation of the modified-media bioretention system, we recommend balancing the pollutant removal efficiency and cumulative effect in modified-media bioretention systems. |
| first_indexed | 2024-12-17T21:10:12Z |
| format | Article |
| id | doaj.art-d9204c7950814894aeac3a88129ffa77 |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-12-17T21:10:12Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-d9204c7950814894aeac3a88129ffa772022-12-21T21:32:29ZengElsevierEcotoxicology and Environmental Safety0147-65132021-12-01228112957Assessment on the cumulative effect of pollutants and the evolution of micro-ecosystems in bioretention systems with different mediaZhaoxin Zhang0Jiake Li1Yajiao Li2Dongqi Wang3Jingyu Zhang4Lingzhi Zhao5State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China; Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an 710075, ChinaState Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China; Corresponding author.School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaState Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaBioretention system is one of the most used green stormwater infrastructures (GSI), and its media is a key factor in reducing runoff water volume and purifying water quality. Many studies have investigated media improvement to enhance the pollutant removal capacity. However, the long-term cumulative effect and microbial effect of pollutants in the modified-media bioretention system is less known. This study investigated the cumulative effect of pollutants and their influence on microbial characteristics in conventional and modified media bioretention system. The addition of modifiers increased the background content of pollutants in the media, and the accumulation of pollutants in planting soil (PS) and bioretention soil mixing + water treatment residuals (BSM+WTR) was relatively higher after the simulated rainfall experiment. The accumulation of pollutants led to a decrease in dehydrogenase activity, and an increase in urease and invertase activities. Ten dominant bacterial species at the phylum level were found in all bioretention systems. The relative abundances of the bacteria with good viability under low nutritional conditions decreased, while the species which could live in the pollutant-rich environment increased. The accumulation of pollutants in the bioretention system led to the extinction of some functional microorganisms. The better the effects of modified media on pollutant removal showed, the more obvious effect on the media micro-ecosystem was. To ensure the long-term efficient and stable operation of the modified-media bioretention system, we recommend balancing the pollutant removal efficiency and cumulative effect in modified-media bioretention systems.http://www.sciencedirect.com/science/article/pii/S0147651321010691Green stormwater infrastructuresBioretention systemsModified mediaCumulative effectMicrobial characteristic |
| spellingShingle | Zhaoxin Zhang Jiake Li Yajiao Li Dongqi Wang Jingyu Zhang Lingzhi Zhao Assessment on the cumulative effect of pollutants and the evolution of micro-ecosystems in bioretention systems with different media Ecotoxicology and Environmental Safety Green stormwater infrastructures Bioretention systems Modified media Cumulative effect Microbial characteristic |
| title | Assessment on the cumulative effect of pollutants and the evolution of micro-ecosystems in bioretention systems with different media |
| title_full | Assessment on the cumulative effect of pollutants and the evolution of micro-ecosystems in bioretention systems with different media |
| title_fullStr | Assessment on the cumulative effect of pollutants and the evolution of micro-ecosystems in bioretention systems with different media |
| title_full_unstemmed | Assessment on the cumulative effect of pollutants and the evolution of micro-ecosystems in bioretention systems with different media |
| title_short | Assessment on the cumulative effect of pollutants and the evolution of micro-ecosystems in bioretention systems with different media |
| title_sort | assessment on the cumulative effect of pollutants and the evolution of micro ecosystems in bioretention systems with different media |
| topic | Green stormwater infrastructures Bioretention systems Modified media Cumulative effect Microbial characteristic |
| url | http://www.sciencedirect.com/science/article/pii/S0147651321010691 |
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