Remediation of in-situ Leach Mining Contaminated Soil by Amendment-plant Synergism

改良剂-植物协同治理原地浸矿污染土壤的研究(英文)

This study aimed to remediate in-situ leach mining contaminated soil by amendment-plant synergism. The results showed that plant species exhibited ex-tremely significant effects on the concentration of nitrate nitrogen; to be specific, the concentration of nitrate nitrogen in soil planted with wheat was reduced from 692.19 mg/kg to lower than 100 mg/kg; when the mass ratio of amendment to soil reached 3：50 and the amendment particle size was 1-2 mm, the concentration of nitrate ni-trogen in soil planted with wheat was reduced to 43 mg/kg. The amendment type exhibited extremely significant effects on the concentration of ammonium nitrogen; to be specific, when the mass ratio of amendment to soil reached 10：50, the concen-tration of ammonium nitrogen in soil added with 2-3 mm zeolite was reduced from 23 593.75 to 3 300 mg/kg on day 15. Amendments and plants mainly exhibited desorption performance for sulfate radical in soil, and the amendment type extreme-ly significantly affected the concentration of sulfate radical; to be specific, the con-centration of sulfate radical in soil added with limestone increased from 370 mg/kg to 900 mg/kg on day 7.

改良剂与植物协同作用治理污染土壤，结果表明：植物种类对土壤中硝态氮浓度的变化影响非常显著，种植小麦的土壤中硝态氮浓度均从692.19 mg/kg降至100 mg/kg以下；当沸石粒径1～2 mm，改良剂与土壤比例为3：50时，种植小麦的土壤中硝态氮浓度降至43 mg/kg。改良剂种类对土壤中铵态氮浓度的变化影响非常显著，当沸石粒径2～3 mm，改良剂与土壤比例为10：50，改良第15天铵态氮浓度由23593.75 mg/kg 降至3300 mg/kg。改良剂、植物对土壤中硫酸根主要表现为解吸作用，改良剂种类对土壤中硫酸根浓度的变化影响非常显著，用石灰石改良剂改良土壤第7天，土壤中的铵态氮浓度由370 mg/kg至900 mg/kg。