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垃圾渗滤液生物处理出水的深度处理组合工艺

Keywords: 垃圾渗滤液,混凝,电解氧化,完全混合式活性污泥法(CSTR),深度处理

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Abstract:

采用“混凝-电解氧化-完全混合式活性污泥法(CSTR)”组合工艺深度处理垃圾渗滤液生物处理出水。探索了工艺的组合及各种工艺操作条件对垃圾渗滤液深度处理效果的影响,并对其影响机理进行了初步探讨。结果表明,以PAC为混凝剂时,在pH和药剂(有效成分)投加量分别为6.0和600mg/L条件下,渗滤液COD去除率达到50%,有效降低了难溶惰性COD含量,缩短了后续电化学处置时间。混凝工艺后,采用电化学工艺处理,在最优工艺条件下:pH为6.0、电流I为1.2A(电流密度为18.18mA/cm2)、Cl-投加量为1000mg/L、极板距离为2cm,电解30min渗滤液COD去除率达到36%,同时,难降解有毒物含量明显降低,渗滤液可生化性TbOD/COD由10%提升至最大值64%。最后采用CSTR处理渗滤液电解出水,系统出水COD、氨氮和色度分别为100~150mg/L、7~13mg/L和25倍,为反渗透(RO)工序提供了良好的水质条件。

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