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| Assessment on Purification Capabilities of Heavy Metals and Nutrients by Different Plant Combinations in Medium and Small Rivers Water and Sediment |
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Received:November 27, 2022
Revised:December 05, 2022
Accepted:December 06, 2022
Published Online:March 17, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.04.016 |
| KeyWord:rural tourism; heavy metals; Cu; Cd; nutrients; health risk assessment; redundancy analysis |
| Author | Institution |
| LU Ming-hua |
南京旅游职业学院 |
| MA Cun-chen |
江苏开放大学 |
| ZHANG Jun |
南京旅游职业学院 |
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| Abstract: |
| In order to explore the impact of rural tourism and its surrounding domestic wastewater on heavy metals and nutrients in water and sediment, and whether different plants can alleviate the pollution, taking Huanglongjian village as research object, the contents of heavy metals and nutrients in the water and sediment of 6 local rivers were analyzed. The potential hazards of the local water and sediment to human body were assessed by health risk assessment and potential ecological risk index methods. Redundancy analysis and correlation heat map were used to reveal the internal relationship between heavy metals and nutrients in the water. The rivers with different plant combinations were used to explore pollution mitigation. The results show that the upstream, midstream and downstream of 6 rivers in the study area generally meet the National Standard Class Ⅴ for surface water environment of China (GB 3838—2002). Health risk assessment shows that all rivers in Huanglongjian village are within the acceptable range except the control rivers. The carcinogenic risk values of heavy metal exposure are higher for children than for adults, and the drinking water route is the main cause of the risk. The potential ecological risk values of heavy metals in sediment are in the order of upstream, midstream and downstream. The single pollutant risk value of Cd in the sediment is the highest, and Cu may cooperate with the nutrients in the water body to induce the deterioration of the water quality environment. It is necessary to strengthen the treatment and restoration of Cd and Cu in water, and timely investigate the surrounding sources that may cause high heavy metal pollution. Metasequoia glyptostroboides, Broussonetia papyrifera and Paraffin can be the first plants for ecological restoration of heavy metals in rivers in the study area. |
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