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中文摘要：
经过生物和化学选择性降解后残留在焦化废水尾水中的多种惰性组分,仍会对人体和水生生态系统构成重大的风险,因此将焦化废水进行深度净化是一个亟待解决的问题.以焦化废水尾水为研究对象,采用自主研制的O3/UV催化氧化流化床反应器,从焦化废水尾水成分出发,对焦化废水尾水能被O3/UV和重铬酸钾氧化的物质构成进行剖析,考察了pH、初始COD浓度对O3/UV氧化焦化废水尾水效果的影响,并对焦化废水被氧化的组分进行模拟动力学的统计性分析.实验表明,O3/UV比重铬酸钾的氧化能力更强,焦化废水尾水中能被O3/UV氧化的成分不仅包括COD,还包括对COD几乎没有贡献的NH4＋-N等组分,初始pH=10—11时尾水COD氧化去除效果最佳,初始COD浓度越高,反应速率越大;O3/UV催化氧化焦化废水尾水中COD时符合一级动力学模型,而NH4＋-N被O3/UV氧化反应符合零级动力学模型;由于废水中存在SCN-、CN-等含氮物质,被O3/UV氧化后使得NH4＋-N浓度呈现先增后降的趋势,NH4＋-N浓度达到最大值的时间与废水中含氮物质的含量呈正相关.结果表明,O3/UV催化氧化流化床反应器对焦化废水尾水具有深度处理效果,依赖于污染物组分的还原活性顺序、降解动力学的应用以及流态化的高传质效率.
英文摘要：
Since various residual inert components co-exist in coking tail wastewater,which still do harm to human beings and aquatic ecosystem even after biological and chemical selective degradation,the advanced treatment and purification is an urgent problem for the coking wastewater.This subject is preformed with the coking tail wastewater after A/O/O at O3/UV fluidized bed reactor.For comparing composition of coking tail wastewater,the oxidative ability of coking tail wastewater is evaluated by oxidation with O3/UV and potassium dichromate（K2Cr2O7）.The influence of pH and initial COD concentration on O3/UV oxidation was studied and the dynamic statistical models for oxidation process of different compositions were established.The results indicated that,O3/UV shows stronger oxidability than potassium dichromate.The compositions oxidized by O3/UV include not only the COD component,but also ammonia and others components.The COD can reach the best removal rate at pH=10—11.With increase of COD concentration,the chemical reaction rate will increase correspondingly.The decline of COD concentration is consistent with a first-order kinetic model in the process of O3/UV catalytic oxidation of coking wastewater while the decline of NH＋4-N concentration can be fit by zero-order kinetic model.Because of the existence of nitrogen-containing substrates such as SCN-and CN-,the NH＋4-N concentration increases first and then decreases when the coking wastewater was oxidized by O3/UV.The time when ammonia nitrogen concentration reaches a maximum value is positively related to the number of nitrogen material.The overall results show that O3/UV catalytic oxidation fluidize bed reactor can be used as depth treatment technology for the coking tail wastewater,which efficiency rely on the sequence reduction activities of pollutant components,application of degradation kinetic model and mass transfer efficiency of fluidization.
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