为了提高生化出水的反渗透性能,本文提出采用Ca(OH)2絮凝沉淀预处理生化出水,再经O3氧化后,用于反渗透膜的深度处理工艺.研究表明,Ca(OH)2絮凝沉淀可以有效地去除垃圾渗滤液生化出水中的大分子有机物及Ca2+、Mg2+离子.当废水絮凝沉淀出水的电导率最低时,废水中的Ca2+和Mg2+离子浓度降到最低,同时也去除了较大比例的COD.对电导率最低条件下的Ca(OH)2絮凝沉淀出水再经O3处理后,废水中的Ca2+和Mg2+离子浓度和COD进一步降低,其反渗透膜通量比MBR出水的通量增高25％-35％,膜污染明显减轻,可延长膜清洗周期.臭氧氧化Ca(OH)2絮凝沉淀出水涉及到臭氧分子直接氧化和氢氧根催化臭氧氧化两种机理,但前者起主导作用.臭氧氧化处理进一步降低了废水中的COD和Ca2+、Mg2+离子浓度,是提高反渗透膜通量的主要原因.
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