Investigation of Catalytic Co-Pyrolysis Characteristics and Synergistic Effect of Oily Sludge and Walnut Shell

Qinghong Li, Huan Yang (), Ping Chen, Wenxue Jiang, Fei Chen, Xiaorong Yu () and Gaoshen Su
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Qinghong Li: School of Chemical and Environmental Engineering, Yangtze University, Jingzhou 434023, China
Huan Yang: School of Chemical and Environmental Engineering, Yangtze University, Jingzhou 434023, China
Ping Chen: Drilling and Production Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 710018, China
Wenxue Jiang: Drilling and Production Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 710018, China
Fei Chen: CCDC Chuangqing Downhole Technology Company, Xi’an 710018, China
Xiaorong Yu: CCDC Chuangqing Downhole Technology Company, Xi’an 710018, China
Gaoshen Su: School of Chemical and Environmental Engineering, Yangtze University, Jingzhou 434023, China

IJERPH, 2023, vol. 20, issue 4, 1-12

Abstract: The co-pyrolysis of oily sludge and walnut shell is a reliable method for solid waste treatment and waste recycling. In this paper, a thermogravimetric analysis was used to study the thermodynamics and synergy effect of oily sludge (OS) and walnut shell (WS) at four heating rates (10, 20, 30, and 40 °C/min) in the temperature range from 50–850 °C. Two model-free methods (FWO and KAS) were used to calculate the activation energy. The results showed that the heating rate had no significant effect on the pyrolysis process. The addition of walnut shell improved the pyrolysis process of the samples. Mixture 1OS3WS had a synergy effect, while other blends showed an inhibitory effect. The synergy effect of co-pyrolysis was strongest when the mass ratio of oily sludge was 25%. The activation energy of the Zn-ZSM-5/25 catalyst was the lowest, and the residual substances were the least, indicating that the Zn-ZSM-5/25 was beneficial to the co-pyrolysis of oily sludge and walnut shell. The analysis of catalytic pyrolysis products by Py-GC/MS found that co-pyrolysis was beneficial to the generation of aromatic hydrocarbons. This study provided a method for the resource utilization of hazardous waste and biomass waste, which was conducive to the production of aromatic chemicals with added value while reducing environmental pollution.

Keywords: oily sludge; co-pyrolysis; biomass; ZSM-5 (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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