Final published version
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Prediction of Soil Heavy Metal Immobilization by Biochar Using Machine Learning
AU - Palansooriya, Kumuduni N.
AU - Li, Jie
AU - Dissanayake, Pavani D.
AU - Suvarna, Manu
AU - Li, Lanyu
AU - Yuan, Xiangzhou
AU - Sarkar, Binoy
AU - Tsang, Daniel C. W.
AU - Rinklebe, Jörg
AU - Wang, Xiaonan
AU - Ok, Yong Sik
PY - 2022/4/30
Y1 - 2022/4/30
N2 - Biochar application is a promising strategy for the remediation of contaminated soil, while ensuring sustainable waste management. Biochar remediation of heavy metal (HM)-contaminated soil primarily depends on the properties of the soil, biochar, and HM. The optimum conditions for HM immobilization in biochar-amended soils are site-specific and vary among studies. Therefore, a generalized approach to predict HM immobilization efficiency in biochar-amended soils is required. This study employs machine learning (ML) approaches to predict the HM immobilization efficiency of biochar in biochar-amended soils. The nitrogen content in the biochar (0.3–25.9%) and biochar application rate (0.5–10%) were the two most significant features affecting HM immobilization. Causal analysis showed that the empirical categories for HM immobilization efficiency, in the order of importance, were biochar properties > experimental conditions > soil properties > HM properties. Therefore, this study presents new insights into the effects of biochar properties and soil properties on HM immobilization. This approach can help determine the optimum conditions for enhanced HM immobilization in biochar-amended soils.
AB - Biochar application is a promising strategy for the remediation of contaminated soil, while ensuring sustainable waste management. Biochar remediation of heavy metal (HM)-contaminated soil primarily depends on the properties of the soil, biochar, and HM. The optimum conditions for HM immobilization in biochar-amended soils are site-specific and vary among studies. Therefore, a generalized approach to predict HM immobilization efficiency in biochar-amended soils is required. This study employs machine learning (ML) approaches to predict the HM immobilization efficiency of biochar in biochar-amended soils. The nitrogen content in the biochar (0.3–25.9%) and biochar application rate (0.5–10%) were the two most significant features affecting HM immobilization. Causal analysis showed that the empirical categories for HM immobilization efficiency, in the order of importance, were biochar properties > experimental conditions > soil properties > HM properties. Therefore, this study presents new insights into the effects of biochar properties and soil properties on HM immobilization. This approach can help determine the optimum conditions for enhanced HM immobilization in biochar-amended soils.
KW - Environmental Chemistry
KW - General Chemistry
U2 - 10.1021/acs.est.1c08302
DO - 10.1021/acs.est.1c08302
M3 - Journal article
VL - 56
SP - 4187
EP - 4198
JO - Environmental Science and Technology
JF - Environmental Science and Technology
SN - 0013-936X
IS - 7
ER -