植酸酶
环境修复
化学
磷酸盐
土壤污染
环境化学
磷矿
镁
水解
土壤水分
污染
磷
土壤科学
环境科学
生态学
生物化学
生物
有机化学
作者
Lijun Han,Jiangshan Li,Xunchang Fei,Mengqi Wang,Shiyu Liu,Xianwei Zhang,Qi‐Kun Xue
标识
DOI:10.1016/j.jhazmat.2023.130860
摘要
Cr(VI) contamination of soil threatens the environment and reduces soil strength. Therefore, both Cr(VI) stabilization and soil reinforcement should be considered in site remediation for future construction. This study investigated a biochemical treatment process using magnesium ascorbyl phosphate (MAP) and phytase. MAP was hydrolyzed via phytase catalysis to produce ascorbic acid (AA) and MgHPO4·3H2O precipitation. The AA reduced Cr(VI) into low-toxic Cr(III), which precipitated as Cr(OH)3 and CrPO4. More than 90% of the 500 mg/kg Cr(VI) in soil was reduced by 5% MAP (wt% of soil) and 1% phytase (vol/vol of soil water) doses at the geotechnically optimal soil moisture content of 16.8%. The MgHPO4·3H2O precipitates filled soil pores and enhanced the unconfined compression strength of treated soil by more than two times. This research reports a novel and practical enzymatically induced phosphate precipitation process for the remediation of Cr(VI)-contaminated soil.
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