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回灌型准好氧填埋场脱氮特性及加速稳定化研究

Keywords: 渗滤液,生物反应器填埋场,三维荧光光谱,溶解性有机物

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Abstract:

采用2个模拟填埋生物反应器,1号柱渗滤液简单回灌,2号柱为渗滤液回灌准好氧联合运行方式,研究了渗滤液回灌准好氧生物反应器填埋场的脱氮特性及加速垃圾稳定化特性。研究结果表明:渗滤液回灌准好氧填埋场具有很强的脱氮能力,2号柱由厌氧运行方式改为准好氧条件下,渗滤液中的氨氮和凯式氮浓度分别由最大值的3198mg/L和3345mg/L降低到第160d的73mg/L和81mg/L,去除率分别为97.7%和97.6%,pH快速升高到8.0左右,COD浓度快速降低。渗滤液中溶解性有机物(DOM)分级结果表明,2号柱HA和FA含量的增加明显快于1号柱。2号柱DOM的三维荧光光谱特性发生了较大变化,荧光基团从60d结构简单的类蛋白物质转变为95d结构复杂的类胡敏酸和富里酸物质,而1号柱渗滤液DOM荧光基团一直是结构简单的类蛋白物质。结果表明回灌准好氧生物反应器填埋场的稳定化速度远快于简单回灌的生物反应器填埋场。

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