关键词: 制浆废水, 臭氧化, γ-氧化铝, 催化活性

Abstract:

In this paper,a comparison was carried out between the ozone oxidation and the γ-Al₂O₃ -catalyzed ozonation for the treatment of bagasse pulping effluent.The results show that ( 1) γ-Al₂O₃ has a certain catalytic effect on ozone and can significantly improve the removal rate of COD_Cr ; ( 2) with the increase of pH value,reaction temperature,ozone concentration and catalyst dosage,the removal rate of COD_Cr first increases and then decreases; ( 3) the catalytic ozonation by γ-Al₂O₃ can also effectively remove the content of AOX ( Absorbable Organic Halogen) in the pulping effluent; and ( 4) in laboratory conditions,the removal rate of AOX reaches 80. 4% after a treatment for 30 min.Moreover,it is demonstrated by the UV and GC-MS results before and after the advanced treatment that γ-Al₂O₃ -catalyzed ozonation can significantly reduce the type and content of organic matters in the effluent and effectively degrade hard biodegradable organic matters; and that γ-Al₂O₃ is of good stability and repetition,concretely,after being reused for eight times,it still keeps 88. 5% of the catalytic activity.

Key words: pulping effluent, ozonation, γ-type aluminium oxide, catalytic activity