无机阴离子对热活化过硫酸盐体系中降解MDEA模拟废水的影响

采用热活化过硫酸盐技术处理MDEA模拟废水，阐明了降解过程中Cl-、CO32-、HCO3-对降解过程的影响。结果表明：无机阴离子的存在会抑制MDEA的降解过程，其中 CO32-与HCO3-单独存在于体系中对MDEA的抑制作用与其浓度呈正相关，离子浓度较高时（0.3 mol·L-1），反应3 h，抑制率分别达到19%与11.5%，而Cl-单独存在于体系时，浓度小于0.1 mol·L-1时，抑制作用呈正相关；浓度在0.1~0.3 mol·L-1时，其抑制作用与浓度呈负相关；氯离子浓度为0.1 mol·L-1时为最大抑制浓度，其抑制率为15%。共生抑制响应曲面分析表明，3种无机阴离子之间交互作用显著，受与SO4-·的反应速率常数控制，抑制的显著性大小为Cl->CO32->HCO3-。

Effects of inorganic anions on persulfate heat-activation for degradation of methyldiethanolamine (MDEA) simulated wastewater

Heat activated persulfate technique used in the treatment of MDEA simulated wastewater has been investigated in this study and the effect of Cl-, CO32-and HCO3- on the degradation process has clarified. Results showed that the presence of Cl-, CO32-and HCO3- inhibited the degradation of MDEA. The concentration of CO32-and HCO3-was positively correlated with inhibition of MDEA degradation. The inhibition of MDEA degradation was positively correlated with the concentration of CO32-and HCO3-. When the ion concentration was high（0.3 mol·L-1）, the reaction time was 3 hours and the inhibition rates were 19% and 11.5% respectively. In the presence of Cl- alone, the inhibitory effect was positively correlated when the concentration was less than 0.1 mol·L-1.The inhibitory effect was negatively correlated with the concentration between 0.1 mol·L-1 and 0.3 mol·L-1 and the inhibition rate was the largest when the concentration was 0.1mol·L-1, the inhibition rate was 15%. Response surface analysis results showed that the three anions existing simultsneously, the interaction between the three inorganic anions was significant and controlled by the reaction rate constant of SO4-?,and the significantly inhibitory effect on sulfate radical was presented as following: Cl-> CO32->HCO3-.