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| Removal of Cd from irrigation water by plant pond + wetland + adsorption pond systems |
| Received:December 16, 2019 |
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| KeyWord:plant pond;irrigation water;Cd;wetland plant;sediment;atmospheric deposition |
| Author Name | Affiliation | E-mail | | HE Zhong-xiang | College of Resources and Environment of Hunan Agricultural University, Changsha 410128, China
The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Hunan Province, Changsha 410128, China
Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | | | DONG Si-jun | College of Resources and Environment of Hunan Agricultural University, Changsha 410128, China
The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Hunan Province, Changsha 410128, China
Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | | | LIU Shou-tao | College of Resources and Environment of Hunan Agricultural University, Changsha 410128, China
The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Hunan Province, Changsha 410128, China
Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | | | LI Dan-yang | College of Resources and Environment of Hunan Agricultural University, Changsha 410128, China
The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Hunan Province, Changsha 410128, China
Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | | | PENG Ou | College of Resources and Environment of Hunan Agricultural University, Changsha 410128, China
The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Hunan Province, Changsha 410128, China
Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | | | LIU Xiao-li | College of Resources and Environment of Hunan Agricultural University, Changsha 410128, China
The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Hunan Province, Changsha 410128, China
Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | | | TIE Bo-qing | College of Resources and Environment of Hunan Agricultural University, Changsha 410128, China
The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Hunan Province, Changsha 410128, China
Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China | tiebq@qq.com |
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| Abstract: |
| A field experiment was conducted in order to reduce the input of Cd into farmland from irrigation water and reduce Cd pollution in farmland soil. A multistage constructed wetland planted with Pontederia cordata, Myriophyllum verticillatum, and wild Zizania was evaluated for Cd removal ability when dealing with irrigation water in a mining area containing Cd exceeding standard values and the distribution of Cd in wetlands was analyzed. The results showed that during October 2018 to September 2019, the total Cd average inflow was 6.35 μg·L-1. After purification by the wetland systems, a removal efficiency of 86.58%, 90.37%, and 81.54% was achieved for the dissolved Cd, particulate Cd, and total suspended solids, respectively. The particulate Cd inflow had a significant positive correlation with suspended solids, and suspended solids had a significant positive correlation with the inflow velocity. The total inputs of Cd from irrigation water and atmospheric sedimentation were 859.61 g and 95.34 g, respectively, and the interception by the wetland systems was 865.52 g. Specifically, the interception of Cd from high to low by each system was as follows:first plant pond(544.64 g) > third free wetland with an adsorption tank (167.62 g) > second plant pond(156.26 g). All three wetland plants had a considerable enrichment effect on Cd, and the concentration decreased with the direction of water flow. The maximum Cd concentrations in the first and second plant pond sediments reached 11.05 mg·kg-1 and 4.75 mg·kg-1, respectively. However, weak acid-soluble Cd occupied a large proportion in the sediment which had a risk of release into water. In general, the multistage constructed wetland system can effectively reduce Cd concentration in irrigation water from typical mining areas and reduce the irrigation input flux of Cd to farmland soil. |
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