铁碳微电解－ Fenton 氧化－絮凝沉淀深度处理焦化废水

摘要

Aiming at the problem that the COD and chroma of the effluent from the secondary bio -logical treatment process of coking wastewater cannot meet the standard ,the experiment analyzes the effect of ad‐vanced treatment of coking wastewater by iron-carbon micro -electrolysis -Fenton oxidization -floccula‐ting settling .It also discusses respectively the effects of original pH value ,H2 O2 dosage ,and the change of HRT on the removal of COD ,and determines the optimal operating parameter in each workshop section .The results show that in the iron-carbon micro -electrolysis process ,when the micro-electrolysis water pH is 2 .5 and HRT is 1 .0 h ,the removal rate of COD is 36% ,the optimal operating parameters of Fenton oxida‐tion process is 10% and dosage of H2 O2 is 2 .0 mL/L ,Fenton oxidation effluent removal rate of COD is 22% .After one-month continuous operation with the determined optimal parameters ,the experimental re‐sults show that the integrated technology's removal rate of COD can reach 52% ,and removal rate of chroma can reach 90% .Biodegradability (B/C) increases from 0 .11to 0 .35 ,and the COD and chroma all meet the standard II of the"Integrated wastewater discharge standards" (GB8978-1996) .%针对焦化废水二级生化处理出水COD、色度无法达标的问题，通过实验研究了铁碳微电解－Fenton氧化－絮凝沉淀集成技术深度处理焦化废水的效果，分别探讨了初始pH值、H2 O2投加量以及水力停留时间 HRT的变化对COD去除率的影响，确定了各工段最佳运行参数。结果表明：铁碳微电解工段微电解进水pH＝2.5，HRT＝1.0h对COD去除率为36％，Fenton氧化工段的最佳运行参数10％ H2 O2投加量为2.0mL/L ，Fenton氧化出水COD去除率为22％。在确定最佳工艺参数后连续运转一个月，实验结果所示：该集成技术对COD的总去除率可达52％，色度去除率可达90％，可生化性（B/C ）由0.11提高到0.35，反应出水COD和色度均满足国家污水综合排放标准（GB8978－1996）的二级排放标准。