高铁酸盐活化过硫酸盐预处理焦化废水的反应机制研究  

Reaction mechanism in pretreatment of coking wastewater by ferrate activated persulfate

作　　者：赵文博 苏冰琴 李瑞[3] ZHAO Wen-bo;SU Bing-qin;LI Rui(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Graduate Education Innovation Center of Shanxi Institute of Municipal Engineering,Jinzhong 030600,China;College of Environment and Ecology,Taiyuan University of Technology,Jinzhong 030600,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024 [2]山西省市政工程研究生教育创新中心,山西晋中030600 [3]太原理工大学环境与生态学院,山西晋中030600

出　　处：《现代化工》2025年第3期106-112,共7页Modern Chemical Industry

基　　金：国家自然科学基金资助项目(22008167);山西省自然科学基金资助项目(202403021211189);山西省专利转化计划项目(202406023)。

摘　　要：采用高铁酸盐活化过硫酸盐[Fe(Ⅵ)/PS]预处理焦化废水。研究PS浓度、Fe(Ⅵ)投加质量浓度、初始pH对预处理焦化废水的影响。结果表明,在PS浓度为10 mmol/L、Fe(Ⅵ)投加质量浓度为5 g/L、初始pH为7、温度25℃的条件下反应60 min,焦化废水中COD和色度的去除率分别达到76.2%和93.8%,BOD_(5)/COD值由0.16提高到0.53。活性物种鉴定实验和中间价态铁测定证实,Fe(Ⅵ)/PS体系中只产生了少量的Fe^(5+)和Fe^(4+),体系中发生作用的主要活性物种为^(1)O_(2)、SO^(-)_(4)·和·OH。三维荧光光谱和GC-MS分析结果表明,Fe(Ⅵ)活化PS生成的活性物质将焦化废水中大分子、难降解有机物转化为小分子和易降解有机物,有效提高了废水可生化性。Ferrate activated persulfate(Fe(Ⅵ)/PS)is used to pretreat coking wastewater,combined with sequential batch reactor(SBR)biological treatment.The influences of PS concentration,Fe(Ⅵ)dosage,initial pH value,and reaction temperature on the pretreatment of coking wastewater are explored.The findings show that the removal rates of COD and chromaticity in coking wastewater reaches 76.2%and 93.8%,respectively,and BOD5/COD value rises to 0.53 from 0.16 after 90 min of reaction under the optimal conditions that PS concentration is 10 mmol·L^(-1),Fe(Ⅵ)dosage is 5 g·L^(-1),pH=7 and reaction temperature at 25℃.Active species identification experiments and intermediate valence state iron determination confirm that only a small amount of Fe^(5+)andFe^(4+)generated in Fe(Ⅵ)/PS system where ^(1)O_(2)、SO^(-)_(4)·and·OH are the main active species to play roles.Three-dimensional fluorescence spectrum and GC-MS analysis show that Fe(Ⅵ)/PS makes macromolecules and refractory organic matters in coking wastewater transform into small molecules and easily degradable organic matter,which improves efficiently the biodegradability of coking wastewater.

关 键 词：高铁酸盐 过硫酸盐 焦化废水预处理 可生化性 

分 类 号：X703[环境科学与工程—环境工程]