结冰解频率加上降雨对As和Sb金属化物的影响,这些金属化物从用Fe基复合剂修复的固化/稳定土壤中脱而出
Ruiyuan Xue1, Kun Wang1, Yipeng Wang1
1State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
The Science of the total environment
|March 21, 2024
概括
复合剂FFC有效地稳定了在受融周期影响的土壤中的. 然而,在长时间的冷解条件下,其对 (Sb) 整治的有效性需要进一步研究和开发新剂.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 土壤科学 土壤科学
背景情况:
- 土壤被 (As) 和 (Sb) 污染给环境带来了风险.
- 循环冷解 (F-T) 周期可以影响土壤修复剂的长期稳定性.
- 稳定/固化 (S/S) 是一种常见的重金属污染土壤修复方法.
研究的目的:
- 为了研究硫酸铁,飞灰和二硫酸盐 (FFC) 复合剂的长期有效性,用于在受循环融 (F-T) 条件下的土壤中进行As和Sb修复.
- 评估F-T周期对FFC处理土壤中As和Sb的浸出行为和迁移的影响.
- 为在自然环境条件下对S/S整治的长期评估提供见解.
主要方法:
- 漏度分析的分析方法
- 使用温泽尔方法确定重金属特异性.
- 用于迁移建模的Hydrus-1D模拟.
主要成果:
- 在长时间的降雨和F-T周期下,FFC证明了 (As) 的有效长期稳定,特别是移动分数.
- 观察到FFC对 (Sb) 的短期稳定,但其长期的移动性受到FT周期数量的显著影响.
- FFC减缓了吸附的As的上升运动,并将剩余的Sb转化为更稳定的形式,尽管As的吸附能力和速度超过了Sb的吸附能力和速度.
结论:
- 在周期性F-T条件下的土壤中,FFC为土壤中的修复提供了长期的治疗效果.
- 需要进一步开发修复剂,以便在长时间的F-T和降雨条件下有效地修复反.
- 该研究提供了关于重金属迁移和出的有价值的预测数据,有助于在自然环境中长期S/S评估.
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