UV-Fenton法预处理某制药厂废水的实验研究

Experimental Study on Treatment of Pharmaceutical Wastewater with UV-Fenton Oxidation

制药废水是一种难生物降解的高浓度有机工业废水,处理困难.研究以某制药股份有限公司综合排放废水为对象,分别采用Fenton和UV-Fenton法对制药废水进行处理,分析试剂投加量、反应初始p H和反应时间等对反应的影响.结果表明,Fenton法处理制药废水的最佳条件为:Fe SO4·7H2O投加0.036 mol/L,H2O2投加0.128 mol/L,初始p H为4.3,反应时间为2 h,CODCr去除率为43.9%.UV-Fenton法处理制药废水缩短反应时间,减少试剂投加量,最佳处理条件为:UV处理时间为7 min,Fe SO4·7H2O投加0.029 mol/L,H2O2投加0.102 mol/L,初始p H为4.3,反应时间为75 min,最佳条件下CODCr去除率优于Fenton法,可达63.5%,且污水B/C增至0.39,提高可生化性.

The pharmaceutical wastewater, a class of industrial wastewater, is characterized by high concentration and low bio-degradability. The treatment efficiency had been compared between Fenton and UV-Fenton of dosage, initial p H, reaction time, and so on. The results showed that the treatment efficiency of UV-Fen-ton oxidation process was better than Fenton. The optimal reaction conditions of Fenton were as follows： thedosage of Fe SO4·7H2O and H2O2 were 0.036 mol/L and 0.128 mol/L respectively, the initial pH was 4.3, the reaction time was 2h, and the removal efficiency of CODCr was 43.9%. However, the optimal conditions of UV-Fenton were as follows： the dosage of FeSO4·7H2O and H2O2 were 0.029 mol/L and 0.102 mol/L respectively, the initial pH was 4.3, the reaction time of UV and Fenton were 7 min and 75 min respectively and the removal efficiency of CODCr was 63.5%. What＇s more, the B/C was increased to 0.39, which showed that UV-Fenton oxidation could improve biodegradability of the pharmaceutical wastewater.