Fenton预处理—序批式生物膜反应器处理模拟染料生产废水研究
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摘要
染料生产废水色度高、COD高、盐度高、毒性高、BOD_5/COD低,直接排放会对环境造成严重污染。由于染料品种越来越多,并朝着抗光解、抗氧化、抗生物降解的方向发展,使染料生产废水处理难度加大。所以,染料生产废水的治理一直是工业废水处理中的难点和热点。
     本论文以偶氮染料活性嫩黄K-6G模拟染料废水为研究对象,将物化法与生化法结合,首先采用Fenton试剂对废水进行预处理,再通过序批式生物膜反应器(SBBR)对废水进行生化处理。在预处理实验中,考察了预处理对染料废水可生化性的影响,并结合溶液的紫外—可见吸收光谱,分析了预处理对染料结构的破坏作用与对废水色度的去除。在SBBR处理过程中,考察了COD在缺氧段与好氧段的降解过程,COD去除效果的稳定性,缺氧段与好氧段时间的分配和容积负荷对COD处理效果的影响,提出了好氧段COD降解过程动力学模型,并考察了系统的硝化功能。
     实验结果显示:(1)Fenton试剂预处理对染料结构的破坏作用显著,可使染料液可生化性显著改善,L_0/COD由0.08上升到0.51;(2)采用序批式生物膜反应器(SBBR)处理经预处理后的染料废水,COD去除效果稳定,平均去除率达63%,且具有一定抗冲击负荷能力;(3)缺氧—好氧结合有利于提高COD的最终去除效率;实验条件下,缺氧时间与好氧时间(小时)之比在16∶8—12∶12时,COD去除率可以稳定在65%以上;(4)当容积负荷低于0.41kgCOD/m~3·d时,COD去除率随容积负荷的增大而升高,最高值可达72%;当容积负荷高于
Wastewater from dye production process is characterized by its high concentration of COD and color, poor biodegradability, large quantity of inorganic salts and strong toxicity. If the wastewater was discharged into water body without treatment, it would cause severe environment and ecosystem problem. In recent years, more and more new types of dyestuffs, which could resist photolysis, oxidation and biodegradation, have been designed and produced. This makes it more difficult to treat the wastewater from dye production process. So the way to treat the wastewater attracts much attention in the field of industrial wastewater pollution control.
    In this paper, a process of combining physic-chemical way with biological way was applied to treat simulated dye wastewater of reactive light yellow K-6G . First, Fenton reagent was used to pretreat the azo dye wastewater. Then sequencing batch biofilm reactor (SBBR) was used in the followed step. The effect of Fenton oxidation on the biodegradability of wastewater was tested by Warburg respiration apparatus and the structure of dye and color removal results were analysed by UV-VIS spectrums. In SBBR process, COD degradation process at aerobic and anoxic stages in a whole period was examined. The stability of COD removal result, the effect of time span of aerobic and anoxic stages and COD loads were investigated. A kinetic model was proposed to describe the degradation process of
引文
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