不同修复措施对污染土壤砷形态分布及土壤理化性质的影响

Effects of Different Remediation Measures on Arsenic Species Distribution and Soil Physical and Chemical Properties in Contaminated Soil

通过对稳定化处理、淋洗处理与生物修复处理后的砷污染土壤开展试验研究,探索不同修复措施对土壤砷总量、砷形态及分布、土壤有机质含量、土壤呼吸强度、土壤水稳性团聚体含量、土壤CEC、土壤速效氮含量、土壤速效钾含量与土壤速效磷含量的影响。结果表明:稳定化处理并未显著降低土壤中总砷含量,淋洗处理与生物修复处理可显著降低土壤总砷含量。稳定化处理与淋洗处理使得土壤呼吸强度、土壤水稳性团聚体含量、土壤CEC、土壤速效氮含量、土壤速效钾含量与土壤速效磷含量显著降低,生物修复使得土壤呼吸强度、土壤水稳性团聚体含量、土壤CEC、土壤速效氮含量、土壤速效钾含量与土壤速效磷含量显著升高。

In this paper, stabilization, leaching and bioremediation treatments were carried out on the arsenic-contaminated soil to explore the soil arsenic content, arsenic morphology and distribution, soil organic matter content, soil respiration intensity, soil water stability agglomeration, soil CEC, soil available nitrogen, potassium and phosphorus contents. The results showed that the stabilization treatment did not significantly reduce the total arsenic content in the soil, and the leaching and bioremediation significantly reduced the total arsenic content in the soil. Stabilization treatment and leaching resulted in significant reduction of soil respiration intensity, soil water-stable aggregate content, soil CEC, soil available nitrogen potassium and phosphorus contents. Bioremediation made soil respiration intensity, soil water stability, agglomerate content, soil CEC, and soil available nitrogen, potassium and phosphorus increased significantly.