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| Remediation of cadmium contaminated vegetable field via surface leaching-deep solidification combined technology |
| Received:August 06, 2019 |
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| KeyWord:Cd pollution;soil;leaching-stabilization combined remediation;lettuce |
| Author Name | Affiliation | E-mail | | YANG Zi-yu | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production/Key Laboratory of Agricultural Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | | | YANG Zhi-min | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production/Key Laboratory of Agricultural Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | bear@swu.edu.cn | | CHEN Yu-cheng | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production/Key Laboratory of Agricultural Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | | | CHEN Qing-hua | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production/Key Laboratory of Agricultural Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | |
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| Abstract: |
| In order to study the effect of surface leaching-deep solidification combined technology on the remediation of cadmium-polluted soil and cadmium content in vegetables in Chongqing suburbs, field experiments were conducted to investigate the effects of tartaric acid surface leaching-hydroxyapatite(HAP)deep solidification and water surface leaching-HAP deep solidification treatments on lettuce yield, quality, cadmium uptake, soil total cadmium, and available cadmium content. The results were compared with those of treatment by traditional repair agents such as humic acid and HAP. The final results showed that talc acid leaching-HAP solidification could significantly reduce the cadmium content in lettuce stems and leaves by 22.89%; furthermore, the lettuce yield significantly increases by 16.89% accompanied with the quality promotion. Meanwhile, the total cadmium content of the surface soil of 0~20 cm was reduced by 30.71%, while the total cadmium content of the deep soil of 40~60 cm increased by 51.57%. Under these two kinds of surface leaching-deep solidification treatments, the available cadmium content in soil at depths of 0~20 cm decreased, then slightly increased at depths of 20~40 cm, followed by a significant decline in the 40~60 cm soil layer. When the soil depth reaches 60~80 cm, the available cadmium content was closer in value to the control group. The cadmium content in the stems, leaves, and roots of the lettuce showed a positive correlation with the soil available cadmium, while it was negatively correlated with the soil organic matter. Surface leaching-deep solidification combined remediation can, therefore, realize the safe production of vegetables while remediating cadmium polluted soil, which is suitable for production and remediation at lightly polluted vegetable bases. |
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