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| Catalytic Ozonation Treatment of Papermaking Wastewater by Al2O3 Loaded with ZnO |
| Received:March 27, 2020 |
| DOI：10.11981/j.issn.1000-6842.2020.03.65 |
| Key Words:catalytic ozonation;papermaking wastewater;Al2O3@ZnO catalyst |
| Author Name | Affiliation | Postcode | | ZHOU Lang | Chongqing Vocational Institute of Engineering， Chongqing， 402260 | 402260 |
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| Abstract: |
| A catalyst loading ZnO on Al2O3 for oxidative degradation of papermaking wastewater was prepared. The properties of the catalyst was characterized by XRD and SEM. The effects of initial pH value of papermaking wastewater， reaction time， and catalyst dosage on the treatment of papermaking wastewater were studied. In addition， the effect of the free radical trapping agent tert-butanol on the catalytic ozone treatment of wastewater was also characterized. The characterization results showed that the Al2O3@ZnO catalyst with good catalytic performance was successfully prepared. Under the conditions of pH value=11， catalyst dosage of 2.0 g/L， and reaction time of 60 min， the removal rate of chemical oxygen demand （COD） reached 84.6%. Furthermore， the removal rate of the catalytic ozonation method was significantly higher than that of the ozonation method alone. The kinetic degradation reaction of CODCr followed a quasi-first-order equation. The experimental results of tert-butanol showed that in the process of Al2O3@ZnO catalyst treating organic matter in papermaking wastewater， hydroxyl radical was the main factor in the degradation of organic matter in wastewater. |
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