Reduction of phosphorus release from high phosphorus soil by red mud |
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| Authors: | Zhen Liang Xianjia Peng Zhaokun Luan Wenjun Li Ying Zhao |
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| Institution: | (1) State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing, 100085, People’s Republic of China;(2) College of City of Construction, Hebei University of Engineering, Handan, 056038, People’s Republic of China; |
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| Abstract: | The high phosphorus levels cause the release of phosphorus from soils, thereby increasing the potential for phosphorus export
to adjacent water bodies. The loss of phosphorus from soils to surface waters is a major source of water quality impairment.
Therefore, soil phosphorus immobilization seems necessary. In this study, red mud (RM) was employed to immobilize phosphorus
in a typical agricultural soil. It was found that phosphorus was effectively immobilized by RM. Batch leaching experiments
showed that RM reduced phosphorus release from 14.38 to 2.56 mg/kg when soil was amended with 1% RM. Column leaching experiments
showed that RM reduced the total amount of phosphorus released from 36.73 to 18.79 mg/kg during the investigated period. Sequential
chemical extraction results indicated that RM amendment transformed H2O-P into more stable fractions. The results suggested that application of RM amendment to soils could significantly immobilize
soluble phosphorus, reducing phosphorus release to the environment. |
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