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生活垃圾焚烧发电厂渗滤液蒸发浓缩处理

Keywords: 生活垃圾焚烧发电厂,渗滤液,蒸发浓缩,废水处理,电絮凝

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Abstract:

垃圾焚烧厂渗滤液因水质复杂,NH3-N、COD和电解质含量高等特点,成为一种难处理有机废水。采用负压蒸发浓缩法对渗滤液及电絮凝预处理渗滤液的处理进行了对比研究,并考查了浓缩比、pH等因素的影响。研究结果表明,电絮凝预处理不能改变渗滤液中COD、NH3-N的蒸发去除规律,即蒸发处理过程中,蒸发冷凝液中COD在蒸发前期和后期含量较高,蒸发中期较低;而NH3-N含量在蒸发处理前期较高,中后期含量较低。pH对蒸发处理影响较大,在酸性pH下COD去除率较低,但NH3-N去除率较高,可达95%以上,而在中碱性pH下,COD去除率增高,NH3-N去除率降低。渗滤液及电絮凝预处理渗滤液的一次蒸发冷凝液,经过二次蒸发处理后,冷凝液中COD和NH3-N含量均能达到一级排放标准,即分别低于100mg/L和15mg/L。

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