从电污泥中回收,使用双极膜电透析和H2O2氧化氧化的综合技术
Rui Lian1, Yaoxing Liu1, Yan Pan1
1College of Environmental and Resource Sciences, College of Carbon Neutral Modern Industry, Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fuzhou, Fujian Province, 350117, China.
Chemosphere
|October 4, 2024
概括
本研究介绍了一种综合技术,用于从电污泥中回收. 该方法使用双极膜电透析和过氧化氧化,有效地将有害的转化为有价值的二氧化.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 电产生大量含有Cr (III) 的电污泥 (EPS).
- 由于其潜在的氧化到有毒的Cr (VI) 的原因,EPS对环境和健康构成风险.
- 从危险废物中回收Cr(III) 的有效方法至关重要.
研究的目的:
- 开发和评估一种综合双极膜电透析 (BMED) -H2O2氧化技术,用于从EPS中恢复Cr.
- 优化工艺参数,以实现高效的Cr3氧化和回收.
- 评估回收的环境影响和产品质量.
主要方法:
- 在性环境中使用H2O2在EPS中的Cr (III) 被氧化为Cr (VI).
- 使用BMED来分离和回收氧化CrVI.
- 研究了包括H2O2剂量,pH,电流密度,固体/液体比率和污泥颗粒大小在内的关键参数.
主要成果:
- 在pH 12.0和5.5mL H2O2.2时,获得了最佳的Cr (III) 氧化 (68.4%).
- 在特定条件下 (电流密度为20.0 mA/cm2,固体/液体比为1:45,污泥颗粒大小为100网格) 获得了58.2%的A Cr (III) 回收率.
- 增加BMED隔间减少了特定能耗,同时保持了高电流效率.
- 处理后的污泥中的残留处于不那么有害的状态.
结论:
- 集成的BMED-H2O2氧化技术有效地从EPS中恢复Cr(III) 作为Na2CrO4.4.
- 该过程为处理含的固体废物提供了可持续的解决方案.
- 回收的Na2CrO4表现出适合进一步使用的理想性质.
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