Fenton氧化对制浆废水中难降解有机污染物的去除效果研究

Study on the Removal Efficiency of Stubborn COD in Pulping Wastewater by Fenton Oxidation

关键词:  制浆废水  Fenton氧化  流化床Fenton氧化  可生化性

Key Words:pulping wastewater  Fenton oxidation  fluidized-bed reactor Fenton oxidation  biotreatbility

摘要:与传统Fenton氧化法相比流化床Fenton氧化法可以有效降低氧化剂的消耗量，同时可以使COD_Cr的去除效率有所提高。由于制浆废水的复杂特性，Fenton氧化反应存在一定的矿化能力极限，处理后废水很难稳定达标。进一步研究确定了最佳反应条件为：H₂O₂用量为1/2Qth、Fe²⁺与H₂O₂摩尔比为1∶5时，一沉池出水进行氧化处理后COD_Cr由1004 mg/L降至235 mg/L，BOD₅/COD_Cr提高到0.59，并通过AOX值和二氯甲烷萃取物GC-MS分析对比，判断废水可生化性显著提高。在此基础上采用流化床Fenton氧化与废水生物处理组合工艺进行处理，可以满足达标排放要求。

Abstract:Traditional Fenton oxidation and fluidized-bed reactor (FBR) Fenton oxidation were used to treat the pulping wastewater, FBR Fenton process could significantly reduce oxidant quantity and by-product, and increase COD_Cr removal efficiency. Fenton reaction had COD_Cr removal limit and the treated effluent could not stably meet the requirement of the regulation due to the complex property of the pulping wastewater. In the optimum conditions: 1/2Qth H₂O₂，Fe²⁺/H₂O₂ 1∶5，COD_Cr of the treated effluent decreased from 1004 mg/L to 235 mg/L, and BOD₅/COD_Cr increased to 0.59. The AOX and GC-MS test result of dichloromethane extractive also indicated the improvement of biotreatability. FBR Fenton-biotreatment integrated process is proposed to treat the pulping wastewater to meet the discharge requirement of the regulation.