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化工学报  2015 

垃圾渗滤液生化出水絮凝-纳滤处理及过程机理

DOI: 10.11949/j.issn.0438-1157.20150099, PP. 2280-2287

Keywords: 垃圾渗滤液,生化出水,混凝,氧化,纳滤

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Abstract:

垃圾焚烧发电厂渗滤液是一种含高浓度腐殖酸类物质和高盐含量的复杂有机废水,传统生化处理后仍难达标排放。本工作围绕垃圾渗滤液生化出水的特性,开展了Ca(OH)2絮凝、臭氧氧化预处理与NF处理相结合的处理工艺,并对处理过程的机理进行了探讨。研究表明,渗滤液生化出水经过Ca(OH)2絮凝处理,可以有效地去除其中的杂环类化合物。生化出水经8g·L-1的Ca(OH)2絮凝处理后,比MBR出水产水通量提高达8.2%。对Ca(OH)2絮凝出水进行臭氧氧化处理,虽然降低了它的COD,但并未进一步提高其NF膜通量,其主要原因可能是臭氧氧化生成的硅氧烷类物质造成了膜的污染;与RO处理垃圾渗滤液生化出水相比较,NF膜无法分离废水中的酮类、胺和酰胺类、杂环类化合物,使得NF产水的COD处在100~160mg·L-1。NF平均膜通量的增大可导致产水COD略有上升;垃圾渗滤液生化出水及其预处理水在NF处理过程中,都没有表现出严重的膜污染。

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