Fenton法深度处理中药废水的研究

Study on further treatment of chinese medicine wastewater with Fenton method

中药废水COD值高且负荷变化大,pH值低,是一种难处理的有机废水.经常规工艺处理后,出水有时仍难达标.采用Fenton试剂对出水进行了氧化降解研究,通过测定废水的COD、UV254吸光值变化以评价氧化的效果,考察了常温常压下Fenton试剂配比、投加量、氧化时间、pH值等因素对制药废水处理效果的影响,初步发现了其氧化规律.在单因素试验的基础上采用正交试验方案,确定最佳工艺条件为:FeSO4.7H2O量为3 mmol/L,pH=3,H2O2/Fe2+为3∶1,反应时间为60 min.在此条件下,COD去除率达到87.50%,COD可降到62 mg/L以下,达到国家排放标准要求.

Chinese medicine wastewater is a kind of organic wastewater that is hard to be refreshed because of high concentrations of COD with unpredictable fluctuations and low pH value. By ordinary treatment process it is difficult to receive qualified effluent water. Fenton reagent is used in the study of the oxidation and degradation of the effluent water. The oxidation effect is evaluated by the changes of COD and UVz54 absorhance. The effects of Fenton reagent ratio, dosage of FeSO4 · 7H2 O, oxidation time, pH value and some other factors on wastewater treatment under normal temperature and pressure are investigated, and the oxidation regularity is initially discovered as well. Orthogonal experiment is applied based on the single factor experiment, as the optimal process condition is determined as follows： the mol ratio of H2O2 ： FeSO4 is 3：1, the dosage of FeSO4 · 7H2O is 3 retool/L, the pH value is 3, the reaction time is 60 min, Under the said condition, the removal rate of COD reaches 87.50%, and the mass concentration of COD in effluent water decreases to below 62 mg/L, which can meet the state discharge standard.