温度对WAO/CWAO处理垃圾渗滤液的影响

催化湿法氧化 (CWAO)是用于处理有机废水十分有效的物理化学方法 ,本实验将该方法用于垃圾渗滤液的处理 .使用CWAO处理垃圾渗滤液 ,温度是一个重要的影响因素 ,因此本研究着重研究温度对污染物去除效率、降解速率的影响 ,建立了温度与速率常数之间的定量关系 ,并初步考察了催化剂 (Co/Bi)在降解垃圾渗滤液过程中的作用 .实验中利用高压反应釜并使用催化剂 ,在封闭条件下对垃圾渗滤液进行处理 ,研究温度对降解反应的影响 .结果表明 :有、无催化剂存在的条件下 ,随着温度的升高 ,总有机碳 (TOC)和COD的去除率均显著增大 ;用Elovich方程可以描述垃圾渗滤液降解反应的动力学过程 ,速率常数k值随着温度的升高而逐渐增大 ,并建立了速率常数k与温度的定量关系式 ;反应液 pH值在反应过程中先迅速降低 ,之后缓慢上升 ,主要由于反应初期生成了大量的有机酸 ,而随着有机酸逐渐被降解 ,反应液 pH值缓慢上升 .通过本研究可知 ,以Co/Bi作催化剂 ,利用CWAO降解稀释后的垃圾渗滤液 ,可以在较为温和的条件下达到较好的处理效果 ,但本研究仅探讨了温度对催化湿法氧化降解垃圾渗滤液有较大的影响 ,其它反应条件如氧化剂、催化剂用量以及垃圾渗滤液浓度等对CWAO法降解效率的影响还有待于进一步研究

Effect of Temperature on Decomposition of Leachates by WAO/CWAO

catalytic wet air oxidation(CWAO) is a very effective physical chemistry method to treat organic wastewater. In this experiment, CWAO is employed to reduce the organic compounds in the landfill leachates. Temperature is an important factor in treating leachates by CWAO, so the effect of temperature on the reduction efficiency and decomposition rate of organic pollutants is investigated emphatically and the quantificational relationship is established between the decomposition rates and temperatures used in this study. The function of Co/Bi catalyst for the reduction of landfill leachates is also discussed. The influence of temperature on the degradation of landfill leachates by CWAO is carried out in a sealed environment using catalyst. The resulted information shows that the reduction rate of total organic carbon (TOC) and chemical oxygen demand (COD) increases notably with increase in temperature with or without the catalyst, and that the Elovich equation can describe dynamics course of landfill leachates degradation well. Rate constant k also increases with increase in temperature and the quantificational relationship is established between the rate constant k and temperature; the main reason of pH value reducing rapidly at first and later rising slowly is that a large amount of organic acid is produced in the early period in the reaction and the organic acid is degraded gradually later. Degradation of landfill leachates by CWAO can reach better treatment efficiency in gentle condition with catalyst Co/Bi in this study. The temperature's relatively great impact on the reaction using CWAO is discussed only in the paper and the effects of the other reaction conditions such as oxidant and catalyst dosage and the concentration of wastewater on degrading efficiency by CWAO are to be focused on.