UV/H2O2系统协同降解苯酚的动力学研究

紫外光/双氧水(UV/H2O2)复合氧化过程在废水处理领域有很广泛的应用前景,但动力学方面的研究较少,为此研究了UV/H2O2工艺降解苯酚废水的动力学.结果表明,苯酚在单独的紫外辐射(UV)、过氧化氢(H2O2)氧化和UV/H2O2协同下的降解均符合表观一级反应动力学.在单独的紫外辐射或过氧化氢氧化下苯酚去除速率很小,而在复合氧化过程UV/H2O2工艺中有显著的提高,表明存在协同效应.苯酚去除的速率常数增强因子可达7.35.进一步从UV/H2O2系统中存在的UV、H2O2和羟基自由基(‘OH)三部分协同作用的降解机理,推导出了简化的机理动力学模型,能很好地反映过氧化氢浓度过量条件下苯酚的降解.苯酚降解的动力学方程为r=d[R]/(dt)=5.33×10-5[R]+2.04×10-3[H2O2]0[R]+2.14×10-5[H2O2]0/[R]0[R]     

电镀废水减量的清洁生产对策

废水减量是电镀行业清洁生产审核的重点.根据电镀行业技术管理水平现状,系统分析了电镀废水的削减潜力,并提出了相应的清洁生产对策.     

MDEA吸收CO2稳态模型的数值求解方法

The shooting method and the difference method are used for numerical simulation of CO2 absorption with aclueous solution of methyldiethanolamine (MDEA). It is demonstrated that these methods axe available for the steady-state model, which may be expressed as a set of differential algebraic equations (DAEs) with two-point boundary values. This method makes it possible not only to obtain the concentration profiles for MDEA system, but also to reveal the effect of CO2 interfacial concentration on the enhancement factor. With this numerical simulation,the mass transfer process with multicomponent diffusion and reactions can be better understood.     

A New Method to Solve Film Model for CO_2 Absorption with Aqueous Solution of AT-Methyldiethanolamine

The shooting method and the difference method are used for numerical simulation of CO2 absorption with aqueous solution of methyldiethanolamine (MDEA). It is demonstrated that these methods are available for the steady-state model, which may be expressed as a set of differential algebraic equations (DAEs) with two-point boundary values. This method makes it possible not only to obtain the concentration profiles for MDEA system, but also to reveal the effect of CO2 interfacial concentration on the enhancement factor. With this numerical simulation, the mass transfer process with multicomponent diffusion and reactions can be better understood.     

MDEA吸收CO2稳态模型的数值求解方法

The shooting method and the difference method are used for numerical simulation of CO2 absorptionwith aqueous solution of methyldiethanolamine (MDEA). It is demonstrated that these methods are available forthe steady-state model, which may be expressed as a set of differential algebraic equations (DAEs) with two-pointboundary values. This method makes it possible not only to obtain the concentration profiles for MDEA system, butalso to reveal the effect of CO2 interfacial concentration on the enhancement factor. With this numerical simulation,the mass transfer process with multicomponent diffusion and reactions can be better understood.     

电镀行业清洁生产审核方法探讨

结合近几年的工作实践,对清洁生产评价指标体系、物料平衡、E-P图和有效益的环境成本管理(EoCM)等在电镀行业清洁生产审核过程中的运用进行了探讨.灵活运用这些审核方法将有助于清洁生产审核过程的顺利开展.