用H2O2/Fe^3＋处理高浓度含甲醛废水的研究

Treatment of wastewater containing high concentration of formaldehyde with H_2O_2/Fe^(3+)

研究采用H2O2/Fe3+催化氧化处理高浓度含甲醛废水,探讨了双氧水和催化剂投加量、反应pH及反应温度等操作条件对处理效果的影响,并通过酸溶解回用失活催化剂。结果表明,较优的操作条件为:H2O2/COD(质量比)=2.2~2.6,Fe3+/H2O2(摩尔比)=0.048~0.058,反应pH1.80~2.68,反应温度50℃,反应时间40 min;在上述操作条件下,甲醛去除率达到99%以上,COD去除率达到85%以上。失活的催化剂可通过稀酸溶解后循环使用,其效果与三价铁盐作催化剂的基本相同。采用H2O2/Fe3+处理含甲醛废水具有比采用H2O2/Fe2+较优的效果。

In this work, hydrogen peroxide and ferric ion were used for the treatment of formaldehyde-containing wastewater. Influence of operating conditions on the treatment efficiency was investigated. The results showed that the optimal operating conditions were as follows： H2O2/COD （wt） = 2.2 -2.6, Fe^3＋/H2O2 （mol） = 0. 048 - 0. 058, pH 1.80 - 2.68, 50 ℃ and 40 min. Under above conditions formaldehyde removal efficiency was over 99% and COD removal efficiency was over 85%. The used catalyst could be regenerated by dissolving it in dilute acid, and the treatment efficiency of the regenerated catalyst was comparable to the ferric salt. The treatment efficiency of formaldehyde-containing wastewater with hydrogen peroxide and ferric ion was better than that with hydrogen peroxide and ferrous ion.