Optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland (UVFCW) driven by substained-release carbon source
Constructed wetland (CW) technology has attracted much attention due to its economical and environmentally friendly features. The low dissolved oxygen (DO) and low carbon/nitrogen (C/N) ratio in the wetland influent water affect the treatment performance of CW, resulting in a decrease in the removal...
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PeerJ Inc.
2025-01-01
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| author | Yuechang Wang Lin-Lan Zhuang Shuang Liu Yuanjun Su Zhen Hu Jian Zhang Xiaoping Wang Shaoming Cui Gang Peng Shuting Xie |
| author_facet | Yuechang Wang Lin-Lan Zhuang Shuang Liu Yuanjun Su Zhen Hu Jian Zhang Xiaoping Wang Shaoming Cui Gang Peng Shuting Xie |
| author_sort | Yuechang Wang |
| collection | DOAJ |
| description | Constructed wetland (CW) technology has attracted much attention due to its economical and environmentally friendly features. The low dissolved oxygen (DO) and low carbon/nitrogen (C/N) ratio in the wetland influent water affect the treatment performance of CW, resulting in a decrease in the removal efficiency of ammonia nitrogen (NH4+-N) and nitrate nitrogen (NO3−-N). In order to address this problem, this study optimized the pollutants removal performance of unsaturated vertical flow constructed wetland (UVFCW) by adding sustained-release carbon sources (corn cobs + polybutylene adipate terephthalate (PBAT)). The results showed that the sustained-release of carbon source increased the carbon source in UVFCW, thus increasing the abundance and activity of denitrifying microorganisms and enhancing the denitrification reaction, ultimately improving the removal of NO3−-N, with its removal efficiency reaching up to 95.50%. The placement method of sustained-release carbon source mainly affected the distribution of carbon source and DO in water body, thus influencing the relative abundance of microorganisms, finally affecting the removal of pollutants. Among them, the removal efficiency of total nitrogen (TN), NO3−-N, and total phosphorus (TP), and the relative abundance of denitrifying microorganisms in the CWR-Cu (uniform placement of sustained-release carbon source) were significantly higher than those in the CWR-Ca (centralized placement above) and CWR-Cb (centralized placement below) (p < 0.05). The surface C:O (carbon:oxygen) ratio of sustained-release carbon source after water treatment showed a decreasing trend, and CWR-Cu exhibited the greatest decrease in C:O ratio. In summary, CWR-Cu achieved the highest utilization of the carbon source and produced the largest number of heterotrophic microorganisms. This study reveals that CWR-Cu is a structural process for the efficient removal of nitrogen and phosphorus pollutants, and our findings provide theoretical basis and technical support for actual projects. |
| format | Article |
| id | doaj-art-0781d63ebdcd47cfbf5ae305046aecdf |
| institution | Kabale University |
| issn | 2167-8359 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | PeerJ Inc. |
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| spelling | doaj-art-0781d63ebdcd47cfbf5ae305046aecdf2025-01-18T15:05:18ZengPeerJ Inc.PeerJ2167-83592025-01-0113e1881910.7717/peerj.18819Optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland (UVFCW) driven by substained-release carbon sourceYuechang Wang0Lin-Lan Zhuang1Shuang Liu2Yuanjun Su3Zhen Hu4Jian Zhang5Xiaoping Wang6Shaoming Cui7Gang Peng8Shuting Xie9Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, ChinaShandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, ChinaFurther Tide Eco-Construction (Hubei) Co., Ltd, Wuhan, ChinaFurther Tide Eco-Construction (Hubei) Co., Ltd, Wuhan, ChinaShandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, ChinaShandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, ChinaBeijing Further Tide Eco-Construction Co., Ltd, Beijing, ChinaBeijing Further Tide Eco-Construction Co., Ltd, Beijing, ChinaBeijing Further Tide Eco-Construction Co., Ltd, Beijing, ChinaFurther Tide Eco-Construction (Hubei) Co., Ltd, Wuhan, ChinaConstructed wetland (CW) technology has attracted much attention due to its economical and environmentally friendly features. The low dissolved oxygen (DO) and low carbon/nitrogen (C/N) ratio in the wetland influent water affect the treatment performance of CW, resulting in a decrease in the removal efficiency of ammonia nitrogen (NH4+-N) and nitrate nitrogen (NO3−-N). In order to address this problem, this study optimized the pollutants removal performance of unsaturated vertical flow constructed wetland (UVFCW) by adding sustained-release carbon sources (corn cobs + polybutylene adipate terephthalate (PBAT)). The results showed that the sustained-release of carbon source increased the carbon source in UVFCW, thus increasing the abundance and activity of denitrifying microorganisms and enhancing the denitrification reaction, ultimately improving the removal of NO3−-N, with its removal efficiency reaching up to 95.50%. The placement method of sustained-release carbon source mainly affected the distribution of carbon source and DO in water body, thus influencing the relative abundance of microorganisms, finally affecting the removal of pollutants. Among them, the removal efficiency of total nitrogen (TN), NO3−-N, and total phosphorus (TP), and the relative abundance of denitrifying microorganisms in the CWR-Cu (uniform placement of sustained-release carbon source) were significantly higher than those in the CWR-Ca (centralized placement above) and CWR-Cb (centralized placement below) (p < 0.05). The surface C:O (carbon:oxygen) ratio of sustained-release carbon source after water treatment showed a decreasing trend, and CWR-Cu exhibited the greatest decrease in C:O ratio. In summary, CWR-Cu achieved the highest utilization of the carbon source and produced the largest number of heterotrophic microorganisms. This study reveals that CWR-Cu is a structural process for the efficient removal of nitrogen and phosphorus pollutants, and our findings provide theoretical basis and technical support for actual projects.https://peerj.com/articles/18819.pdfUVFCWSustained-release carbon sourceNitrogen removalCarbon source placement methodDenitrification |
| spellingShingle | Yuechang Wang Lin-Lan Zhuang Shuang Liu Yuanjun Su Zhen Hu Jian Zhang Xiaoping Wang Shaoming Cui Gang Peng Shuting Xie Optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland (UVFCW) driven by substained-release carbon source PeerJ UVFCW Sustained-release carbon source Nitrogen removal Carbon source placement method Denitrification |
| title | Optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland (UVFCW) driven by substained-release carbon source |
| title_full | Optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland (UVFCW) driven by substained-release carbon source |
| title_fullStr | Optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland (UVFCW) driven by substained-release carbon source |
| title_full_unstemmed | Optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland (UVFCW) driven by substained-release carbon source |
| title_short | Optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland (UVFCW) driven by substained-release carbon source |
| title_sort | optimization and action mechanism of pollutant removal performance of unsaturated vertical flow constructed wetland uvfcw driven by substained release carbon source |
| topic | UVFCW Sustained-release carbon source Nitrogen removal Carbon source placement method Denitrification |
| url | https://peerj.com/articles/18819.pdf |
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