Catalytic ozonation in advanced treatment of kitchen wastewater: multi-scale simulation and pilot-scale study

doi:10.1007/s11783-023-1746-5

Front. Environ. Sci. Eng.

2023, Vol. 17

Issue (12) : 146 https://doi.org/10.1007/s11783-023-1746-5

RESEARCH ARTICLE

Catalytic ozonation in advanced treatment of kitchen wastewater: multi-scale simulation and pilot-scale study

Zuoyong Zhou, Ni Yan, Mengxi Yin, Tengfei Ren, Shuning Chen, Kechao Lu, Xiaoxin Cao, Xia Huang, Xiaoyuan Zhang(

)

State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China

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Abstract

● A multi-scale model of catalytic ozonation in a packed-bed reactor was established.

● The model included fluid, mass transfer and reaction in bed and catalyst scales.

● Laboratory-scale tests and multi-scale simulation guided pilot-scale research.

● The pilot-scale process was remarkably effective in treating kitchen wastewater.

Catalytic ozonation is regarded as a promising technology in the advanced treatment of refractory organic wastewater. Packed-bed reactors are widely used in practical applications due to simple structures, installation and operation. However, mass transfer of packed-bed reactors is relatively restrained and amplified deviations usually occurred in scale-up application. Herein, a multi-scale packed-bed model of catalytic ozonation was established to guide pilot tests. First, a laboratory-scale test was conducted to obtain kinetic parameters needed for modeling. Then, a multi-scale packed-bed model was developed to research the effects of water distribution structure, catalyst particle size, and hydraulic retention time (HRT) on catalytic ozonation. It was found that the performance of packed bed reactor was increased with evenly distributed water inlet, HRT of 60 min, and catalyst diameter of about 3–7 mm. Last, an optimized reactor was manufactured and a pilot-scale test was conducted to treat kitchen wastewater using catalytic ozonation process. In the pilot-scale test with an ozone dosage of 50 mg/L and HRT of 60 min, the packed-bed reactor filled with catalysts I was able to reduce chemical oxygen demand (COD) from 117 to 59 mg/L. The performance of the catalytic ozonation process in the packed-bed reactor for the advanced treatment of actual kitchen wastewater was investigated via both multi-scale simulation and pilot-scale tests in this study, which provided a practical method for optimizing the reactors of treating refractory organic wastewater.

Keywords Catalytic ozonation Multi-scale simulation Pilot-scale study Kitchen wastewater

Corresponding Author(s): Xiaoyuan Zhang

About author:

^#Equal contributions.

Issue Date: 09 August 2023

Cite this article:

Zuoyong Zhou,Ni Yan,Mengxi Yin, et al. Catalytic ozonation in advanced treatment of kitchen wastewater: multi-scale simulation and pilot-scale study[J]. Front. Environ. Sci. Eng., 2023, 17(12): 146.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-023-1746-5
https://academic.hep.com.cn/fese/EN/Y2023/V17/I12/146

Fig.1 (a) COD, (b) COD removal and (c) kinetic curves of O₃, O₃/H₂O₂, O₃/Catalysts I, Catalysts I adsorption and O₃/Catalysts II process in the bench test.

Tab.1 FRI information of EEM fluorescence spectroscopy

Fig.2 EEM fluorescence spectra of (a) influent, (b) effluent of O₃ process treatment, (c) effluent of O₃/H₂O₂ process treatment, and (d) effluent of O₃/Catalyst I process treatment.

Fig.3 (a) COD removal by laboratory-scale experiments and simulation. (b) COD concentration in catalysts and bed with height in pilot-scale simulation. (c) Distribution of the COD inside the catalyst at the bed heights of (left) 1.5 m, (middle) 0.9 m and (right) 0.3 m in pilot-scale simulation.

Fig.4 (a) COD and (b) velocity distribution in the reactors with different structures.

Fig.5 Effluent COD of (a) different reactor structures and (b) different HRT. (c) Effluent COD over time and (d) comparison of reduced pressure over height for different catalyst particle sizes.

Fig.6 Comparison of (a) COD, (b) COD removal, and (c) ozone utilization rate with different HRT.

Fig.7 Comparison of (a) COD, (b) COD removal, and (c) ozone utilization rate with different ozone dosages.

Fig.8 Comparison of (a) COD, (b) COD removal, and (c) ozone utilization rate with different catalysts.

Fig.9 (a) COD, (b) COD removal, and (c) ozone utilization rate by catalytic ozonation and ozonation of kitchen wastewater (secondary effluent) in continuous experiments.

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