湿式过氧化物氧化法处理硫化钠废碱液的动力学研究

Study on the Kinetics of Wet Peroxide Oxidation of Sodium Sulfide Containing Wastewater

废碱液中富含硫化物会对废液的生物降解起抑制作用,故废液在排往污水处理之前常须进行预处理。今采用常用于有机物废水处理的湿式过氧化物(Fenton试剂)催化氧化法(CWPO)来对含硫化物的废碱液进行处理,并对其催化氧化硫化钠过程的反应动力学进行研究。实验结果表明:用CWPO工艺对于硫化钠废碱液的处理具有良好的催化氧化效果,反应在120分钟内硫化钠的去除率可达到99%以上。过氧化物催化氧化硫化钠过程符合一级反应动力学,催化剂Fe2+的浓度和溶液的pH值对其影响较小,实验验证了推导出的动力学模型能很好地反映CWPO工艺下硫化钠的降解。过氧化物湿式催化氧化硫化钠废碱液的动力学方程为:0.979220d26.1095exp(29353/)[H O]dC RT Ct?=?

Sulfides usually will inhibit the waste water biodegradation and sometimes pretreatment is needed to get rid of it. Here the catalytic wet peroxide oxidation (CWPO) process was proposed to pretreat the sulfides. The effect of CWPO on the removal of sodium sulfide in the west water was experimentally studied and the oxidation kinetics of the sulfide removal was investigated. The results show that the sodium sulfide removing rate of 99% can be reached in 120 minutes, and the oxidation reaction is a first-order reaction. The concentration of Fe2+ and the pH value have little effect on the reaction rate, and the amount of H2O2 used is the chief factor affecting the oxidation reaction. The kinetic equation for the oxidation reaction of sodium sulfide was established and which is found to suit the experimental data quite well. Its mathematical expression is as follows: -(dC/dt)=26.1095exp(-29353/RT) [H2O2]00.979C.