LONG-TERM STABILIZATION EFFECT AND ECOLOGICAL RISK ASSESSMENT OF SOIL CADMIUM AND LEAD BY USING MODIFIED COCONUT SHELL BIOCHAR

MAO Xinyu; YU Huaizhi; ZHAI Senmao; JIANG Xiaosan; XU Zhou; WANG Qilin

doi:10.13205/j.hjgc.202204020

Volume 40 Issue 4

Apr. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(4): 140-146

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MAO Xinyu, YU Huaizhi, ZHAI Senmao, JIANG Xiaosan, XU Zhou, WANG Qilin. LONG-TERM STABILIZATION EFFECT AND ECOLOGICAL RISK ASSESSMENT OF SOIL CADMIUM AND LEAD BY USING MODIFIED COCONUT SHELL BIOCHAR[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 140-146. doi: 10.13205/j.hjgc.202204020

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LONG-TERM STABILIZATION EFFECT AND ECOLOGICAL RISK ASSESSMENT OF SOIL CADMIUM AND LEAD BY USING MODIFIED COCONUT SHELL BIOCHAR

doi: 10.13205/j.hjgc.202204020

1. College of Agricultural Science and Engineering, Hohai University, Nanjing 211000, China;
2. College of Taizhou Research Institute, Nanjing Agricultural University, Taizhou 225300, China

Received Date: 2021-07-25
Available Online: 2022-07-06

Abstract

Abstract

Heavy metal pollution in farmland soil attracted broad attention in China due to its harm to human health and ecological environment. In order to explore the feasibility of biochar on remediating soil heavy metals in pilot-scale, the long-term stabilization effect and ecological risk of soil cadmium and lead was studied by using the nitric acid and potassium permanganate modified coconut shell biochar. With application of different dosages of biochar, the long-term variation of soil cadmium and lead bioavailability was discussed, in combination with the results of soil-agricultural product comprehensive quality impact index, to evaluate the possible ecological risk after the remediation. The results showed that the modified biochar could significantly improve the stability of soil cadmium and lead. When the applied amount of modified bichar was higher than 20 g/kg, soil cadmium and lead were mainly in residual fraction after 12 weeks and the immobilization rates were increased by 8%~23% and 11%~24%, respectively, compared with the control group. After 15~18 weeks’ remediation, the contents of bioavailable cadmium and lead in soil were maintained within the safety threshold, and no excessive metals were detected in the planted vegetables. This study indicated that it might be desirable to use modified coconut shell biochar for large-scale remediation of soil heavy metals.
- modified biochar,
- cadmium,
- lead,
- long-term stabilization effect,
- ecological risk assessment

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References

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