新型Fenton-固定床催化载体的制备及其对造纸废水深度处理的研究

Preparation of New Fenton Fixed-bed Catalytic Carrier and Its Advanced Treatment for Papermaking Wastewater

关键词:  固定床  Fenton氧化  催化载体  造纸废水

Key Words:fixed bed  Fenton oxidation  catalytic carrier  papermaking wastewater

摘要:以陶粒填料为载体，采用浸渍-焙烧法制备了新型Fenton-固定床催化载体，考察了FeCl₃溶液浓度和焙烧温度对催化载体催化活性的影响。结果表明，在FeCl₃溶液浓度0.75 moL/L、焙烧温度600℃的条件下，制备得到的催化载体对造纸废水的催化活性最好。将此新型催化载体置于固定床内联合Fenton氧化法进行造纸废水深度处理，在最佳工艺条件（水样初始pH值=5、催化载体添加量10 g/L、0.5 g/L FeSO₄·7H₂O、0.3 mL/L H₂O₂（质量分数30%）、反应时间60 min）下，其对造纸废水COD_Cr的去除率为72%。对比3种处理工艺（常规Fenton、填料-Fenton和Fenton-固体床催化载体）可知，达到相同的废水处理效果时，Fenton-固定床催化载体处理工艺所需的药品添加量最少，所需的水样初始pH值最高。

Abstract:A new type of Fenton fixed-bed catalytic carrier was prepared by immersion-roasting method via using ceramics filter as the carrier. The effects of concentration of FeCl₃ solution and roasting temperature on the catalytic activity of the catalytic carrier were studied. The results showed that the catalytic activity of the catalytic carrier was optimum when the concentration of FeCl₃ solution was 0.75 moL/L and roasting temperature was 600℃. This new type of catalytic carrier was placed in a fixed bed combined with Fenton oxidation method for advanced treatment of papermaking wastewater. Under the optimal process conditions （initial pH value was 5， addition amount of catalytic carrier was 10 g/L， amount of FeSO₄·7H₂O was 0.5 g/L， amount of H₂O₂ （mass fraction 30%） was 0.3 mL/L， reaction time was 60 min）， the COD_Cr removal efficiency of 72% was reached. Comparing three treatment processes， it could be seen that when the same wastewater treatment efficiency was achieved， the Fenton-fixed-bed catalytic carrier treatment process required the least amount of chemical addition， and the required initial pH of the water sample was the highest.