Comparison of thermal alkaline pretreatment and zinc acetate-catalyzed methanolysis (MtOH-ZnOAc) for anaerobic digestion of bioplastic waste

Jayen Aris Kriswantoro; Chen-Yeon Chu; Ting-Rui Chang; Hao-Jen Pai; Chih-Kai Chang; Yi-Pang Chiu

doi:10.1016/j.biortech.2023.128959

Comparison of thermal alkaline pretreatment and zinc acetate-catalyzed methanolysis (MtOH-ZnOAc) for anaerobic digestion of bioplastic waste

Bioresour Technol. 2023 Jun:377:128959. doi: 10.1016/j.biortech.2023.128959. Epub 2023 Mar 23.

Authors

Jayen Aris Kriswantoro¹, Chen-Yeon Chu², Ting-Rui Chang³, Hao-Jen Pai³, Chih-Kai Chang⁴, Yi-Pang Chiu⁴

Affiliations

¹ Ph.D. Program of Mechanical and Aeronautical Engineering, Feng Chia University, Taiwan; Institute of Green Products, Feng Chia University, Taiwan; School of Life Sciences and Technology, Institut Teknologi Bandung (ITB), Indonesia.
² Ph.D. Program of Mechanical and Aeronautical Engineering, Feng Chia University, Taiwan; Institute of Green Products, Feng Chia University, Taiwan; Institute of Atmospheric Pollution Research (IIA), CNR, Italy. Electronic address: cychu@mail.fcu.edu.tw.
³ Institute of Green Products, Feng Chia University, Taiwan; Department of Mechanical and Computer-Aided Engineering, Feng Chia University, Taiwan.
⁴ GREAT Biomaterials Co., Ltd., Taiwan.

PMID: 36965583
DOI: 10.1016/j.biortech.2023.128959

Abstract

The aim of this work was to study the effect of thermal alkaline pretreatment and zinc acetate-catalyzed methanolysis (MtOH-ZnOAc) in biogas production from bioplastic in anaerobic digestion. The pretreated bioplastic with MtOH-ZnOAc performs efficient solubilization and produced 205.7 ± 6.9 mL/g COD_added, which is higher than thermal alkaline degradation. The mesophilic condition produces more than 79% higher biogas compared with the thermophilic condition with the diluted pretreated bioplastic by 30 times. The kinetic study was well fit the experimental data and showed the correlation between cumulative biogas, production rate, and lag phase with mono- and two-stage system in batch fermentation. The two-stage system produced 315.6 ± 7.7 mL/g COD_added which was higher 67.2 ± 2.02 than the mono-stage system. Methanosaetaceae predominates among the Archaea, which are primarily responsible for methanogenesis, showing a contribution to a higher biogas production rate.

Keywords: Biogas; Bioplastic; Dilution; Pretreatment; Zinc acetate.

MeSH terms

Anaerobiosis
Biofuels*
Biopolymers / metabolism
Bioreactors
Catalysis
Methane / metabolism
Zinc Acetate*

Substances

Zinc Acetate
Biofuels
Biopolymers
Methane