混凝-Fenton法预处理模拟电脱盐废水

采用混凝-Fenton法对模拟电脱盐废水进行预处理,筛选出最佳混凝和氧化条件。结果表明:FeSO4.7H2O和聚丙烯酰胺投加量分别为1000 mg/L和7 mg/L,Fenton反应初始pH值为7,H2O2投加量为0.06 mL/mL(分两次投加),n(H2O2)∶n(Fe2+)=10∶1,反应2 h的条件下,经此法处理后硫化物和COD去除率分别达99%和90%以上,废水中较低浓度的Fe3+和Mn2+有利于Fenton氧化反应。

PRE-TREATMENT OF SIMULATED ELECTRIC DESALTING WASTEWATER BY COAGULATION-FENTON PROCESS

The coagulation-Fenton process was used in pre-treating simulated electric desalting wastewater and in selecting the best conditions of coagulation and oxidation.The results show that under the conditions of FeSO4.7H2O dosage 1000 mg/L,polyacrylamide dosage 7 mg/L,Fenton initial pH value 7,H2O2 dosage 0.06 mL/mL(H2O2 were added every 30 minutes during the first hour of reaction),n(H2O2) /n(Fe2 +) =10,reaction time 2 h,the sulfide and COD removal rate is 99% and 90% respectively by using this process.And lower concentrations of Fe3 + or Mn2 + are beneficial to the Fenton oxidation reaction.