In this paper, Fenton process was determined to be an effective technique to treat the\nrefractory nonylphenol ethoxylates (NPEOs) wastewater. The chemical oxygen demand\n(COD) removal efficiencies above 89% were obtained when the initial COD\nconcentration was 12,000 mg/L. However, a large amount of ferric sludge (SS = 8.724\ng/L) would be produced after the Fenton oxidation of the wastewater and must be\ndisposed appropriately. A novel process for Fenton sludge reused by low-cost ferrous\nsulfide (FeS) was also investigated. Experimental results show that the Fenton sludge\ncould be reduced to produce a certain amount of Fe2+ in the acidic mixed liquor by\nFeS. This mixed liquor from Fenton sludge could be used as the new catalyst in the\nFenton process and was also highly effective for the NPEOs wastewater treatment.\nThe residual FeS from the mixed liquor could be used for the next batch of the reaction.
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