臭氧氧化深度处理脱硫废水的影响因素研究

针对经过化学沉淀法处理后的火电厂脱硫废水中COD含量过高且重金属锰出水水质不达标问题进行研究,采用臭氧氧化法进行深度处理,考察臭氧浓度、反应时间、p H等因素对脱硫废水处理效果的影响。确定最佳处理条件分别为:臭氧浓度为78.5 mg/min,反应时间为25 min,p H为9。处理后结果显示,COD含量由641 mg/L降为296 mg/L,处理效率为53.8%;重金属锰和SS的处理效率分别为99%和45.5%,处理结果均达到国家一级排放标准(GB 8978-1996)。

The problem that the high COD and manganese concentration in the desulfurization wastewater from the thermal power plant treated by the chemical precipitate process is studied.The ozone oxidation method is used for the deep treatment to the desulfurization wastewater.The factors such as ozone concentration,reaction time and pH,which impact on the effect of the desulfurization wastewater treatment were investigated.The optimum reaction conditions were as follows:ozone concentration 78.5 mg/min,reaction time 25 min,pH 9.Under this condition,the COD content decreased from 641 mg/L to 296 mg/L,the treatment efficiency was 53.8%.The treatment efficiency of heavy metal manganese and SS were 99%and 45.5%respectively,the results reached the national emission standards(GB 8978-1996).