电解式零价值铁激活甲酸盐对污泥脱水性能的影响
Shaodong Guo1, Yuhang Wu2, Zhangyu Wang2
1School of Urban Construction, Wuhan University of Science and Technology, 10 of Huangjiahu West Road, Hongshan District, Wuhan 430065, Hubei, China
概括
电解零价值铁激活甲酸盐 (EZVI-NaClO) 的预处理通过破坏细胞外聚合物物质 (EPS) 显著改善了污泥脱水能力. 这一过程减少了毛细管吸收时间和污泥粘度,提高了污泥流动性.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 废水污泥管理 废水污泥管理
背景情况:
- 污泥脱水能力是废水处理中的一个关键挑战.
- 细胞外聚合物物质 (EPS) 显著影响污泥特性和脱水效率.
- 现有的预处理方法通常在有效性和环境影响方面存在局限性.
研究的目的:
- 为了评估电解零价值铁激活甲酸盐 (EZVI-NaClO) 作为污泥预处理方法的有效性.
- 调查EZVI-NaClO对污泥脱水性,分解性和EPS特性的影响.
- 为了确定EZVI-NaClO预处理过程的最佳条件.
主要方法:
- 使用毛细血管吸水时间 (CST) 评估了泥脱水能力.
- 分析了泥分解的方法,通过测量超浮物中的氨和.
- 细胞外聚合物物质 (EPS) 的蛋白质和多糖含量通过3D-EEM进行了分析.
- 测量了泥颗粒的特性,包括粘度和颗粒大小.
主要成果:
- 最佳的EZVI-NaClO预处理条件是pH2,NaClO剂量为100mg/gDS,电流为0.2A,反应时间为30分钟.
- 这些条件导致CST减少了43%,表明改善了脱水能力.
- EZVI-NaClO处理破坏了EPS结构,降低了密集结合EPS (TB-EPS) 中的蛋白质和多糖含量,并增加了可溶EPS (S-EPS) 中的蛋白质和多糖含量.
- 污泥粘度从195.4至54.9mPa·S显著降低,改善了污泥的流动性.
结论:
- EZVI-NaClO是一种有效的预处理方法,可以提高污泥的脱水能力.
- 该机制涉及EPS内部的蛋白质和多糖结构的破坏,从而提高了污泥的疏水性.
- 优化的EZVI-NaClO工艺为污泥管理提供了一个有前途的方法.
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