反向溶液扩散增强了泥脱水在死胡同向前透的前进透
Da-Qi Cao1,2,3, Shi-Cheng Lei1, Hui Liu1
1Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Membranes
|September 27, 2024
概括
绝缘前透 (DEFO) 通过使用盐离子释放结合的水来提供高效的污泥脱水. 像NaCl和CaCl2这样的特定盐显著降低了污泥的水分含量,改善了除水性能.
科学领域:
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 污水处理厂产生大量的过剩污泥.
- 传统的脱水方法耗费大量能源和空间.
- 死亡前透 (DEFO) 为深层污泥脱水提供了一种节能替代方案.
研究的目的:
- 为了研究抽取溶液逆透对污泥蛋糕结构和水分含量的影响.
- 评估不同盐 (NaCl,KCl,CaCl2) 在提高DEFO性能方面的有效性.
- 了解细胞外聚合物物质在污泥脱水中的作用.
主要方法:
- 使用死结前透法 (DEFO) 进行污泥脱水.
- 将NaCl,KCl和CaCl2作为抽取溶液引入污泥料中.
- 分析污泥蛋糕结构和水分含量的变化.
- 测量水流量和评估细胞外聚合物质的影响.
主要成果:
- 添加NaCl和CaCl2显著降低了污泥的水分含量,分别为79.7%和67.3%,而最初的98.1%.
- 由于生物离子失衡 ("高K和低Na") 而导致的KCl没有改善.
- 与单一溶液相比,NaCl和CaCl2的二元吸水溶液增强了水的流量.
- 细胞外聚合物物质改变了过蛋糕结构,改善了水道,降低了阻力.
结论:
- 抽取溶液的反透有效地减少了污泥中的结合水,增强了DEFO脱水.
- 盐的选择至关重要;NaCl和CaCl2是有效的,而KCl不是.
- 二元抽取溶液系统和细胞外聚合物质的影响为使用DEFO提高污泥脱水效率提供了途径.
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