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 Fe5+ and Fe4+ generated in Fe(Ⅵ)/PS system where 1O2,· 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.
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