|
| In-situ Remediation of Cadmium-polluted Agriculture Land Using Stabilizing Amendments |
| |
| View Full Text View/Add Comment Download reader |
| KeyWord:amendments; Cd; in-situ immobilization; wheat; rice; soil remediation |
| Author Name | Affiliation | | LUO Yuan-heng | School of Resource and Engineering, Guizhou University, Guiyang 550003
State Key Laboratory of Pollution Control and Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | GU Xue-yuan | State Key Laboratory of Pollution Control and Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | WU Yong-gui | School of Resource and Engineering, Guizhou University, Guiyang 550003 | | LLU Zhi-min | State Key Laboratory of Pollution Control and Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | TONG Fei | State Key Laboratory of Pollution Control and Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | TAN Yin-yue | State Key Laboratory of Pollution Control and Reuse, School of the Environment, Nanjing University, Nanjing 210023, China |
|
| Hits: 3501 |
| Download times: 3925 |
| Abstract: |
| In-situ immobilization of heavy metal contaminated soils is a cost-effective remediation technique. However, stabilizing agents are critical to this technique. Here five amendments, including calcium-based montmorillonite（MT）, fused calcium-magnesium phosphate（CMP）, phosphorus rock（PR）, superphosphate（SP）, and triple superphosphate（TSP）, were chosen to remediate a Cd-contaminated farmland soil. All amendments were applied at 1.3 kg·m-2 alone or in combination with 0.52 kg·m-2 lime. Two season crops（wheat and rice）were grown after amendment applications. Amendments significantly reduced the uptake of Cd in crop grains. CMP and MT with lime had the greatest Cd reduction in wheat（78.7% and 72.8% respectively）, while CMP and TSP with lime were the best for Cd reduction in rice（82.83% and 67.43%, respectively）. Most amendments greatly decreased dissolved fraction of Cd in soil, due to increased soil pH. Cadmium contents in grains showed a significant negative correlation with soil pH, but a significant positive correlation with soil acid-soluble Cd. Applications of amendments, especially dissolvable P fertilizers, significantly increased crop production, might due to reduced Cd toxicity and improved Ca, Mg and P nutrition. The results show that CMP with lime provides the best Cd immobilization for both wheat and rice. MT with lime would also be a good amendment for wheat under limited P fertilizers. |
|
|
|
