水化深度处理渗滤液尾水中的有机物

Removal of organic matters from landfill leachate effluent by hydration reaction

利用水泥的水化过程易受有机物影响的特点,采用硅酸盐水泥深度处理了垃圾渗滤液膜生物反应器(MBR)工艺出水,考察了不同因素,如投加量、初始pH、反应时间及振荡速率等对于渗滤液尾水中有机物的去除效果以及最佳工艺条件,并分析了渗滤液尾水中有机物的去除机理。结果表明,水化过程对渗滤液尾水中的有机物去除性能良好,且对不同有机物具有一定的选择性,尤其对具有近紫外区(200～400 nm)吸收峰特征的有机物去除效果更佳,同时发现,当投加量为50 g/L、pH=8.3(原渗滤液pH)、反应时间为24 h和振荡速度为200 r/min时,去除效果最佳,其COD、TOC和UV254的平均去除率分别达到55.6%、62.1%和68.8%。

Portland cement was employed to treat the effluent of MBR process during the landfill leachate treatment, based on the fact that cement hydration reaction is easily affected by organic matters. The operation parameters such as cement dosage,the value of pH, reaction time and stirring rate were investigated, the organic removal mechanism was also discussed. The results indicated that the organics of landfill leachate could be re- moved effectively by the hydration reaction process, and the method is selective to different species of oranic mat-ters,especlally for the organics with the property of ultrabiloet absorbancy peak in the range of 200 - 400 nm. Moreover,the optimum conditons for the organic removal were portland cement concentration of 50 g/L, the ini-tial pH of 8.3 （which was the pH of raw landfill leachate） , and the reaction time of 24 h with the stirring rate of 200 r/min, under which the corresponding COD, TOC, UV254average removal efficiencies were 55.6% ,62. 1% and 68.8% , respectively.