混凝-Fenton氧化联合处理含丙烯酸化工废水

Treatment of Acrylic Acid Wastewater with Combining Coagulation and Fenton Process

采用混凝-Fenton氧化联合技术,对可生化性差的含有丙烯酸的化工废水进行处理,考察了不同因素对COD去除率的影响。结果表明,对于COD为150000～160000mg/L的高浓度丙烯酸废水,经过混凝和Fenton氧化的联合处理,废水COD的去除率可高达80%左右,但出于实际生产运用中成本、运行难度和污泥量的考虑,选择其混凝最佳反应条件为:10%PAC投加量为5%,1‰PAM投加量为0.25%,pH为9,反应时间1h;Fenton最佳反应条件:初始pH为3,[Fe2+]/[H2O2]的摩尔比为0.05,H2O2与废水的体积比为2%左右,反应时间3h,沉降1h。在这个条件下,COD的去除率可达60%左右,而且可生化性比较好。

Treatment of less - biodegradable acrylic acid wastewater with combining coagulation and Fenton process was researched to find out the impacts on removal rate of COD. The results showed that the removal rate of the wastewater with high concentration of 150000 - 160000mg/L can reach 80% by the process. However, for the consideration of the actual production of cost, operation difficulty and sludge quantity, the optimal reaction of coagulation were that the dosage of 10% PAC was 5% with 0. 25% of 1‰ PAM, pH was 9, the reaction time was 5 minutes. The optimal reaction of Fenton were that initial pH was 3, and the mole rate of Fe^2 ＋ to H2O2 was 0. 05, and the volume rate of H202 to water was about 2% with 3 hours reaction time and 1 hour sedimentation. Under abore conditions, the removal rate of COD can reach about 60% with excellent biodegradability.