混合工艺,将超和电氧化相结合,用于COD和从工业洗衣废水中去除非乙氧酸盐
Mahdieh Khajvand1, Patrick Drogui1, Hamed Arab1
1Institut National de La Recherche Scientifique (INRS), Centre-Eau Terre Environnement (ETE), Université Du Québec, 490 Rue de La Couronne, Québec, G1K 9A9, Canada.
Chemosphere
|July 25, 2024
概括
这项研究有效地通过超和电氧化从洗衣废水中去除了非乙氧酸盐 (NPEO) 和化学氧气需求 (COD). 该过程实现了高降解率,满足了水的再利用指南,并消除了内分泌干扰物.
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
- 废水整治 废水整治 废水整治 废水整治
背景情况:
- 洗衣废水含有非尼尔乙酸盐 (NPEO),可降解为持久性非尼尔 (NP),是一种内分泌干扰物.
- NP和NPEO对野生动物和人类健康构成风险,需要从工业洗衣废水 (LWW) 进行有效的清除.
- 传统的废水处理厂很难完全去除NPEO及其副产品.
研究的目的:
- 调查工业洗衣废水 (LWW) 中的NPEO和化学氧气需求 (COD) 的降解.
- 评估一个两阶段的处理过程,将超过 (UF) 和电氧化 (EO) 结合起来.
- 确定电氧化过程的最佳运行条件,以有效地去除污染物和再利用水.
主要方法:
- 一个两阶段的处理过程,涉及超过 (UF) 进行固体去除,然后电氧化 (EO).
- 优化EO参数,包括电流密度,电解时间,阴极类型 (石墨),以及支持电解质 (Na2SO4) 度.
- 利用实验设计方法来确定NPEO和COD的最佳降解条件.
主要成果:
- 在最佳的EO条件下,NPEO (NPEO3-17) 降低了97%,COD降低了61%.
- NPEO和NP去除效率在94%至98%之间,证实了各种乙氧酸盐链长度的有效降解.
- 该工艺符合水再利用指南 (NPEO <200 μg.L-1,COD <100 mg.L-1),运营成本为3.65美元·m-3.
结论:
- 联合UF-EO工艺对于处理污染了NPEO和NP的工业洗衣废水非常有效.
- 电氧化显示出降解NPEO及其持久副产品nonylphenol的巨大潜力.
- 优化的流程提供了一个具有成本效益的解决方案,以实现洗衣机运营中的水再利用标准.
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