H2O2/Fe0、H2O2/Fe2+、H2O2/Fe3+3种体系处理印染废水

采用H2O2/Fe0、H2O2/Fe2+、H2O2/Fe3+3种体系分别对印染废水进行处理,研究pH 值、H2O2投加量、不同价态铁元素的投加量及反应时间对印染废水的COD和色度处理效果的影响。实验最佳的处理条件:H2O2/Fe0体系在pH 为3.0,Fe0投加量为3.0 mmol/L,H2O2投加量为9.0 mL/L,反应时间为40 min时,COD去除率达到95.99%,色度去除率达到100%;H2O2/Fe3+体系在pH 为3.0,Fe3+投加量为5.0 mmol/L,H2O2投加量为12.5 mL/L,反应时间为100 min时,COD去除率达到95.89%,色度去除率达到100%;H2O2/Fe2+体系在pH 为3.0,Fe2+投加量为6.0 mmol/L,H2O2投加量为12.0 mL/L,反应时间为100 min时,COD去除率达到95.85%,色度去除率达到100%。对比分析3种体系在各因素下的处理结果,H2O2/Fe0体系和H2O2/Fe3+体系都要优于H2O2/Fe2+体系,其中H2O2/Fe0体系的处理效果最好。

Treatment of printing and dyeing wastewater by three systems of H2O2/Fe0, H2O2/Fe2+ and H2O2/Fe3+

With the adoption of three systems H2O2/Fe0, H2O2/Fe2+ and H2O2/Fe3+, the printing and dyeing wastewater was treated. We researched the impact of changing pH value, the dosage of H2O2 and iron with different chemical valence, and reaction time on removal effects of COD and color. The optimized experimental conditions were for H2O2/Fe0 system, pH=3.0, [Fe0]=3.0 mmol/L, [H2O2]=9.0 mL/L, reaction time of 40 min; for H2O2/Fe3+ system, pH=3.0, [Fe3+]=5.0 mmol/L, [H2O2]=12.5 mL/L, reaction time of 100 min; for H2O2/Fe2+ system, pH=3.0, [Fe2+]=6.0 mmol/L, [H2O2]=12.0 mL/L, reaction time of 100 min. Under those conditions, COD removal rates were 95.99%, 95.89%, 95.85%[KG-*4], respectively, color removal rates were all 100%. By comparing and analyzing the results of those three systems under different conditions, the results showed that H2O2/Fe0 system and H2O2/Fe3+ system were both better than H2O2/Fe2+ system. Among three systems, H2O2/Fe0 system presented the best treatment effect.