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臭氧氧化法深度处理生活垃圾焚烧厂沥滤液

Keywords: 生活垃圾焚烧厂,沥滤液,臭氧氧化,小球藻,毒性

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Abstract:

采用臭氧氧化法对生活垃圾焚烧厂沥滤液经生化处理后的废水(称沥滤液生化处理水)进行深度处理。实验结果表明,COD降解速率随废水pH的提高明显增加,其中pH=10.5时的COD降解速率常数约为pH=4时的5.8倍。在臭氧投量为52.92mg/min、pH=10.5的条件下反应70min后,UV254和COD去除率分别达到84.7%和59.3%。向反应体系投加叔丁醇后COD去除率下降了约15%,由羟自由基氧化去除的COD占总COD去除量的26.7%。毒性实验结果表明,沥滤液生化处理水的96h-EC50为38%,经臭氧氧化进一步处理后出水的96h-EC50为77%,表明经臭氧深度处理后沥滤液生化处理水的毒性明显降低。

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