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### Catalytic Ozonation Advanced Treatment of Pulping Effluent Catalyzed by γ-Al2O3 Loaded with Binary Metal Oxides

WANG Congcong, MO Lihuan, YANG Zhen, LI Jun, XU Jun, TAN Jinqiang

1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technclogy, Guangzhou 510640, China
• Received:2017-04-07 Online:2017-12-25 Published:2018-01-05

Abstract: A loading binary metal oxide Mn-Ni/γ-Al2O3 catalyst was synthesized with γ-Al2O3 as support and with the transition metals Mn, Ni as active ingredients. The catalyst was characterized by XRD, XRF, BET. Then the catalyst was used for the ozonation advanced treatment of pulping effluent. The relationship between wastewater CODcr and affecting factors was established via the response surface analysis with Box-Behnken mathematical model. The results showed that the Mn and Ni were loaded on the surface and in the internal hole-channel successfully; After the load of these metals, the particle size decreased, and the specific surface area, pore volume and average pore size decreased by 11.96%, 16.48% and 5.28% respectively. The optimal condition for treatment was initial pH 8.7, catalyst dosage 9.2 g/L and ozone concentration 29.6 mg/L. Under this condition, the removal rates of CODCr and AOX with Mn-Ni/γ-Al2O3(mole ratio of Mn and Ni 6:4) as catalyst were 75.1% and 85.98% after 30 min treatment (40℃). Furthermore, the removal rate for this catalyst still reached 70.6% after being repeatedly used for 6 times. And the ionic releases of Mn and Ni was remained below 1 mg/L during the reaction, indicating of the high stability and good performance of the Mn-Ni/γ-Al2O3 catalyst had for repeated use.

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