Fe/C微电解-Fenton氧化-混凝沉淀-生化法处理染料母液废水
Treatment of mother liquor of dyeing wastewater with Fe/C electrolysisFenton oxidation-coagulation sedimentation-biochemical process
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摘要: 采用Fe/C微电解-Fenton氧化-混凝沉淀-生物接触氧化法处理强酸性染料生产母液废水。结果表明，组合工艺对该强酸性母液废水具有理想的处理效果。在铁炭处理单元，当铁炭比为2.5∶1，曝气量为90 L/h，HRT=80 min时，单级色度和COD去除率分别为77.2%和48.7%，BOD5/COD升高至0.30；Fenton氧化处理单元，当30%H2O2投加量为3 mL/L，pH=3.5，HRT=80 min时，单级色度和COD去除率分别为83.6%和77.4%，BOD5/COD升高至0.48。再经过混凝沉淀和生物接触氧化处理后，废水的色度和COD总去除率可分别高于99.8%和99.2%。Abstract: The mother liquor of dyeing wastewater was treated by the joint process of ferric-carbon electrolysis-Fenton oxidation-coagulation sedimentation-biological contact oxidation. The results of the tests showed that the combined process had high removal efficiency on the treatment of strong acid mother liquor of dyeing wastewater. In the ferric-carbon microelectrolysis unit, the colority and COD removal rates were 77.2% and 48.7%,respectively, the value of BOD5/COD could reach 0.30 when the the volume ratio of ferric to carbon was 2.5∶1, the aeration rate was 90 L/h,the HRT was 80 min.In the Fenton oxidation unit, the colority and COD removal rates were 83.6% and 77.4%, respectively, the value of BOD5/COD could reach 0.48 when the dosing quantity of 30% H2O2 was 3 mL/L,pH was 3.5, HRT was 80 min. In the end, after the coagulation sedimentation and biological contact oxidation process, the total removal rates of colority and COD were above 99.8% and 99.2%, respectively.
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