Fenton氧化深度处理稠油废水

Advanced Treatment of Heavy Oil Wastewater by Fenton Oxidation

郭训文 汪晓军

GUO Xun-Wen，WANG Xiao-Jun

针对稠油废水成分复杂、可生化性差、毒性大，使用常规处理方法难以使出水COD达标排放的问题，采用Fenton氧化对其进行深度处理。探讨了H2O2和Fe2+投加量、废水初始pH值、反应时间、药剂投加方式对稠油废水COD去除效果的影响。结果表明：在摩尔比n(H2O2):n(Fe2+)=1:1、质量比m(H2O2):m(COD)=1:1、反应时间2 h、废水初始pH=3、反应温度18~20℃、一次性投加药剂的条件下，废水COD去除率为74.2%，出水COD值为58.9 mg/L，完全满足油田废水达标排放的要求。在药剂投加总量相同的情况下，相比一次性投加，分两次或三次投加药剂可降低COD值。

Advanced treatment of Fenton oxidation was used to treat heavy oil wastewater which was hard to make effluent COD meet the discharge standard by conventional treatments due to its complexity, poor biodegradability and great toxicity. The effects on COD removal by dosages of H2O2 and Fe2+, oxidation time, pH value and dosing mode were studied. Experiment results showed that under the operating conditions with 1:1 mole ratio of H2O2:Fe2+, 1:1 mass ratio of H2O2:COD, 2 h oxidation time, 3 initial pH value, 18~20℃reaction temperature and adding chemicals once for all, the removal efficiency of COD was higher than 74% and effluent COD was of 58.9 mg/L, which could meet the discharge standard completely. In addition, increasing of addition times of reagents could improve the removal of COD in wastewater.