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| Remediation effects of biochar on cadmium-contaminated soils with humic acid |
| Received:April 18, 2022 |
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| KeyWord:heavy metal pollution;cadmium;biochar;humic acid;remediation effect |
| Author Name | Affiliation | E-mail | | MA Xiangbang | College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730030, China
Key Laboratory of Western China' s Environmental Systems, Lanzhou 730030, China
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou 730000, China | | | ZHAO Zhuanjun | Key Laboratory of Mountain Epigenetic Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Ministry of Water Resources, Chengdu 610041, China | zhj_zhao@lzu.edu.cn | | HAN Liangwei | College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730030, China
Key Laboratory of Western China' s Environmental Systems, Lanzhou 730030, China
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou 730000, China | | | ZHENG Xu | College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730030, China
Key Laboratory of Western China' s Environmental Systems, Lanzhou 730030, China
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou 730000, China | | | SUN Guohuai | College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730030, China
Key Laboratory of Western China' s Environmental Systems, Lanzhou 730030, China
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou 730000, China | | | YUE Haoyu | College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730030, China
Key Laboratory of Western China' s Environmental Systems, Lanzhou 730030, China
Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, Lanzhou 730000, China | |
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| Abstract: |
| To investigate the effects of humic acid on biochar remediation of heavy metal-contaminated soils and the morphological changes of Cd in contaminated soils, two different humic acid[huminic acid（HA）and fulvic acid（FA）（] 0.1% and 1%，m/m）and two kinds of biochar[corn straw biochar（CBC）and rice husk biochar（RBC）] were evaluated via soil culture experiments. Twelve kinds of soil amendments were prepared in soil culture experiments to reveal the differences and mechanisms of biochar stabilization of Cd under different humic acids. The results of the present study were as follow：Humic acid enhanced the stabilization of Cd in soil by biochar. Compared with the untreated group, the percentage of residual Cd in the soil increased by 145.89% and 117.96% with CBC under the action of HA（1%）and FA（1%）and 124.04% and 159.58% with RBC under the action of HA（1%）and FA（1%）, respectively. High humic acid addition（1%）significantly reduced soil pH and increased the cation exchange capacity（CEC）, soil organic matter（SOM）, and available phosphorus content of the soil. The surface of biochar was rich in oxygen-containing functional groups and abundant aromatic carbon, which can bind heavy metal ions through complexation, surface precipitation, and cation- π-bond interactions. In summary, the combination of 1% FA and RBC have the best remediation effect on Cd-contaminated soils. The co-application of FA and RBC increase the CEC, SOM, and available phosphorus content of the contaminated soil by 24.56%, 27.14%, and 34.81%, respectively and decrease the Cd migration index by 65.85%. |
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