臭氧-过氧化氢氧化预处理H酸废水

Pretreatment of H acid wastewater by ozone-hydrogen peroxide oxidation process

采用工业生产中排放的H酸废水作为研究对象,探讨了臭氧-H2O2氧化的预处理方法对该废水的处理效果。结果表明:在单独臭氧氧化反应体系中,初始CODCr的质量浓度为1 200 mg/L,pH值为7,臭氧氧化时间在20 min(通量为1 L/min)时,CODCr和色度去除率分别为36.7%和95%。单独H2O2氧化反应体系中,H2O2投加量为8 mL/L时,CODCr去除率为7.7%,H2O2投加量达到60 mL/L时,CODCr去除率最高仅达到25.6%。臭氧-H2O2联用体系中,相同初始CODCr浓度、pH值、臭氧氧化时间及臭氧通量条件下,质量分数为3%的H2O2溶液投加量为8 mL/L时,CODCr和色度去除率分别可达48.8%和98%。因此,臭氧-H2O2氧化的预处理方法对H酸废水降解效果良好,且明显优于单独臭氧氧化以及单独H2O2氧化。

Taking H acid wastewater discharged from industrial production process as the research object, the effect of ozoneoxidation process on the pretreatment of the said kind of wastewater was discussed. The results showed that： in sole ozone oxidation reaction system, when the initial mass concentration of CODcr was 1 200 mg/L, the pH value was 7 and the oxidation time was 20 min （ozone flux was 1 L/min）, the removal rates of CODcr and colority were 36.7% and 95% respectively; in sole hydrogen peroxide oxidation reaction system, with hydrogen peroxide dosage of 8 mL/L and 60 mL/L, the removal rates of CODcr were 7.7% and 25.6% respectively; and in the ozone-H2O2 oxidation combined system, when the dosage of the H2O2 with mass fraction of 3% was 8 mL/L, the removal rates of CODcr and colority were 48.8% and 98% respectively under the condition which was the same as the that of the sole ozone oxidation reaction system. It could be seen that, using ozone-H2O2 oxidation process to pretreat H acid wastewater could get a satisfying effect, which was obviously superior to that of using ozone oxidation or H2O2 oxidation process separately.