Co-Digestion Biomethane Production and the Effect of Nanoparticle: Kinetics Modeling and Microcalorimetry Studies
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Co-Digestion Biomethane Production and the Effect of Nanoparticle: Kinetics Modeling and Microcalorimetry Studies Yi Qiu 1,2 & Chong Li 3 & Chang Liu 3
& Kiros Hagos
4
Received: 28 July 2020 / Accepted: 29 September 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
To improve the production rate of methane, powder-activated carbon (PAC), granule activated carbon (GAC), titanium dioxide-anatase (TiO2), and synthesized zeolite (permutit) were added in the co-digestion process. The co-substrates were corn stover (CS) and pig manure (PM) mixed in the ratio of 1:2 (w/w). The kinetic analysis model and ADM1da model were applied to obtain the kinetic parameters of the process. Besides, the heat flow analysis of the co-digestion process was determined using isothermal microcalorimetry. The addition of the PAC, GAC, TiO2, and synthesized zeolite improved the methane cumulative yield by 40.12, 31.25, 31.17, and 43.74% respectively, as compared with the control reactor. The kinetic analysis and ADM1da model results indicated that the overall rate constant of the co-digestion process increased by 1.5 times averagely because of the effect of these materials. It was also observed that much higher heat energy released from the experimental sample compared with the control reactor, which indicated that the improvement of the metabolic process of the AcoD system. The addition of TiO2-anatase improved methane production by 31.17%, which could be a promising method to improve the biomethane in a large-scale due to its availability and accessibility. Keywords Improved methane . TiO2 nanoparticles . Anaerobic co-digestion . ADM1da modeling
* Chang Liu [email protected] * Kiros Hagos [email protected]
1
School of Materials Science & Engineering, Shandong University, Jinan 250061, China
2
Jinan Gold Phoenix Brake Systems Co. Ltd., Jinan 251400, China
3
College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
4
Mekelle Institute of Technology (MIT), Mekelle University, 1632 Mekelle, Ethiopia
Applied Biochemistry and Biotechnology
Introduction Livestock farms produce a huge amount of manure annually, which causes serious demands on the environment protection [1]. On the other hand, livestock byproducts are valuable resources for the production of renewable energy and nutrient-rich agricultural fertilizers [2]. For example, pig manure (PM) is used as a substrate for anaerobic digestion (AD) processes currently running around the world to produce biomethane. Although PM is convenient and feasible, it has been recognized that using swine manure alone may not achieve the most efficient production of biogas due to the low carbon/nitrogen (C/N) ratio. Depending upon pig growth stages, the C/N ratio for the PM is around 6 to 8, which is too low for the anaerobic digester to function efficiently to utilize the nutrients in the manure. Moreover, the organic content of manures is often poor in both quantity and quality, which prevents a good biomethane yield. It has b
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