UV/Fenton Catalyst system was used to treat Eosin B in simulated dye wastewater developed here.Studies showed that when the initial concentration was 50mg/L,at 25℃,the best condition was that pH=4.5 =0.54mol/L /≈1/2...UV/Fenton Catalyst system was used to treat Eosin B in simulated dye wastewater developed here.Studies showed that when the initial concentration was 50mg/L,at 25℃,the best condition was that pH=4.5 =0.54mol/L /≈1/29(Mol ratio) t=100min.Under this optimized condition,the decolorization rate was 99.7% above.The initial concentration of Eosin B and different effect of cation and anion on its decolorization were studied.Finally,comparing before and after UV spectrum,the results showed that the degradation of Eosin B was completed.展开更多
The experiments focused on the Fenton treatment of humic substances(HS) in concentrated landfill leachate rejected by reverse osmosis(RO).The changes in dissolved organic matter by oxidation/coagulation were assessed ...The experiments focused on the Fenton treatment of humic substances(HS) in concentrated landfill leachate rejected by reverse osmosis(RO).The changes in dissolved organic matter by oxidation/coagulation were assessed by using gross organic parameters such as chemical oxygen demand(COD),total organic carbon(TOC),UV254 and COD/TOC molar ratio during the treatment with Fenton reagent.The results demonstrated that the humic substances removal efficiency(from 11.9% to 89.5%) was higher than that of COD(from 9.6% to 75.2%) and there was a good correlation between humic substances degradation and COD removal.This study showed that the oxidation efficiency controlled the coagulation efficiency,so high oxidation efficiency may cause relatively low coagulation.The change of(COD/TOC)oxid indicated that the oxidation reaction was ultimate degradation under the condition of pH= 2.0—4.0,>80 mmol·L-1,= 40—160 mmol·L-1,reaction time 2 h.The changes of(COD/TOC)coag illustrated that the oxidation state of the organic matter removed by coagulation was significantly higher than in the fresh landfill leachate under the above reaction conditions.展开更多
文摘UV/Fenton Catalyst system was used to treat Eosin B in simulated dye wastewater developed here.Studies showed that when the initial concentration was 50mg/L,at 25℃,the best condition was that pH=4.5 =0.54mol/L /≈1/29(Mol ratio) t=100min.Under this optimized condition,the decolorization rate was 99.7% above.The initial concentration of Eosin B and different effect of cation and anion on its decolorization were studied.Finally,comparing before and after UV spectrum,the results showed that the degradation of Eosin B was completed.
文摘目的研究UV/Fenton氧化法对难降解有机物硝基苯的氧化能力,确定UV/Fenton氧化法处理硝基苯处理废水的工艺条件.方法以自配硝基苯水样为处理对象,采用自制光反应器,通过试验研究分析H2O2投加量、Fe2+质量浓度、反应时间、pH值、硝基苯初始质量浓度等对UV/Fenton氧化法处理硝基苯废水处理效果的影响.结果实验研究结果表明,UV/Fenton氧化法对硝基苯有较高的去除率和反应速率,硝基苯的去除率可达到95%.H2O2投加量、Fe2+质量浓度、反应时间、pH值和硝基苯初始质量浓度对处理效果均有较大影响.结论硝基苯的质量浓度在不大于200mg/L时,UV/Fenton法能够有效去除硝基苯,最佳反应条件为:H2O2倍数为1.5左右,Fe2+与H2O2的摩尔比为1∶30,pH值为4左右,反应时间为50 min.
文摘The experiments focused on the Fenton treatment of humic substances(HS) in concentrated landfill leachate rejected by reverse osmosis(RO).The changes in dissolved organic matter by oxidation/coagulation were assessed by using gross organic parameters such as chemical oxygen demand(COD),total organic carbon(TOC),UV254 and COD/TOC molar ratio during the treatment with Fenton reagent.The results demonstrated that the humic substances removal efficiency(from 11.9% to 89.5%) was higher than that of COD(from 9.6% to 75.2%) and there was a good correlation between humic substances degradation and COD removal.This study showed that the oxidation efficiency controlled the coagulation efficiency,so high oxidation efficiency may cause relatively low coagulation.The change of(COD/TOC)oxid indicated that the oxidation reaction was ultimate degradation under the condition of pH= 2.0—4.0,>80 mmol·L-1,= 40—160 mmol·L-1,reaction time 2 h.The changes of(COD/TOC)coag illustrated that the oxidation state of the organic matter removed by coagulation was significantly higher than in the fresh landfill leachate under the above reaction conditions.
