Abstract: The dyeing wastewater was treate by Fenton-like oxidation to investigate the effects of wastewater initial pH，catalyst dosage，H₂O₂ dosage and reaction time by contrasting with that of Fenton reaction.And the variation of iron concentration and H₂O₂ dosage in Fenton and Fenton-like process were also explored.Experimental results showed that under condtions of the pH range of Fenton oxidation from 3 to 8，at ferrous sulfate dosage of 2 g/L，H₂O₂ dosage of 20 mmol/L and reaction time 2 h，COD removal is 59.39% and decolorization is 97.71% in Fenton reaction.At chalcopyrite dosage of 9 g/L，H₂O₂ dosage of 20 mmol/L，pH=3 and reaction time 4 h,COD removal is 56.03% and decolorization is 93.79% in Fenton-like reaction.It was also found that the ·OH ion which is generated by Fenton and Fenton-like reaction in treating the dyeing wastewater could degradate organic pollutants.

Key words: Fenton reaction, Fenton-like reaction, Chalcopyrite, Dyeing wastewater