Sorption-catalysis-enhanced effects of crab shell derived CaO-based biochar addition on the pyrolysis of waste cooking oil fried sludge

Yanhua Li; Long Wu; Qing Xu; Zhanyong Li

doi:10.1515/ijcre-2023-0107

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Sorption-catalysis-enhanced effects of crab shell derived CaO-based biochar addition on the pyrolysis of waste cooking oil fried sludge

Yanhua Li , Long Wu , Qing Xu und Zhanyong Li

Veröffentlicht/Copyright: 8. Februar 2024

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Aus der Zeitschrift International Journal of Chemical Reactor Engineering Band 22 Heft 3

Abstract

In order to promote the yield and calorific value of combustible gas products in the pyrolysis, a CaO-based biochar (CSC) derived from waste crab shell was used as a low-cost sorption-enhanced catalyst to enhance oil-fried sludge (OS) pyrolysis. The effects of CSC addition and pyrolysis temperature on OS pyrolysis characteristics were analyzed in detail. The results indicated that adding CSC significantly enhanced OS pyrolysis and produced more combustible gas products with CO₂ removal. At 700 °C, adding CSC promoted the combustible gas yields and greatly reduced CO₂ by 96.9 %. And the corresponding LHV of pyrolysis gas products increased by 26.8 % and reached up to 33.7 MJ/N m³. Additionally, TG-FTIR analysis revealed that adding CSC reduced the formation temperature of CH₄. Importantly, although there was only 35.5 wt% of Ca in CSC, CSC exhibited almost the same sorption-catalysis-enhanced effects compared to pure CaO. These findings suggest that biochar derived from crab shell has the potential to replace CaO for enhancing sludge pyrolysis into value-added fuel products.

Keywords: pyrolysis; crab shell derived biochar; sewage sludge; waste cooking oil

Corresponding author: Long Wu, Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China; and International Joint Research Center of Low-Carbon Green Process Equipment, Tianjin 300222, China, E-mail: wulong@tust.edu.cn

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: Grant No. 52206273

Research ethics: The local Institutional Review Board deemed the study exempt from review.
Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Competing interests: The authors state no conflict of interest.
Research funding: The authors gratefully acknowledge the funding support from National Natural Science Foundation of China (Grant No. 52206273).
Data availability: The raw data can be obtained on request from the corresponding author.

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Received: 2023-05-30

Accepted: 2023-12-20

Published Online: 2024-02-08

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https://doi.org/10.1515/ijcre-2023-0107

Schlagwörter für diesen Artikel

pyrolysis; crab shell derived biochar; sewage sludge; waste cooking oil