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Optimizing Methane Production from Anaerobic Batch Co-Digestion of Apple Pomace and Vegetable Waste

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Co-digestion of apple pomace (AP) and vegetable waste (VW) was a feasible proposal to simultaneously eliminate their potential pollution to the environment and produce alternative biogas energy, whereas, it can be easily interrupted by rapid acidogenesis and inhibition of methanogen. Additionally, the methane yield could not be maximization due to the recalcitrant cellulose substance of AP. The inoculum regulation was employed for overcoming the acidogenesis problem and enhancing methane yield when conducting high-solids (TS of 10%) co-digestion of AP and VW under mesophilic condition. The chosen inoculum was the special acclimated anaerobic granular sludge (AGS) from the upflow anaerobic sludge blanket reactor treating VW acidification liquid. The AGS inoculum was preferable to the conventional inoculum in view of the multitudinous and abundant methanogens. Under the optimum inoculation conditions, the anaerobic batch co-digestion of AP and VW at different mixing TS ratios of 5:0, 4:1, 3:2, 2:3, 1:4 and 0:5 were conducted to obtain a suitable substrate mixing ratio. Results showed that the optimal AP/VW ratio was 2:3, which gave the highest methane yield of 336 mL/g-VS. The excellent performance of the co-digestion was attributed to the balanced C/N, reduced accumulation of volatile fatty acids (VFAs), stable pH value, as well as the high quality and quantity of methanogens included in the inoculum.


Document Type: Research Article

Publication date: August 1, 2019

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  • The goal of the creation of a biobased economy is challenging to agriculture, forestry, academia, government and industry. The extractable resources of the Earth are finite, regardless of the quibble over when they will be depleted. The economic, political and social demands for biobased chemicals, materials and energy are expected to radically transform the materials industries, particularly the plastics industry as well as the biofuel industry. These changes will be based on the principles of sustainability, eco-efficiency, industrial ecology, and green chemistry and engineering. In keeping with the growth of knowledge in this field, there is a strong need for a forum to share original research related to biobased materials and bioenergy. The Journal of Biobased Materials and Bioenergy (JBMB) has been created as an international peer-reviewed periodical to fulfill the need for communication in these research areas. This journal will encompass related research activities in all fields of science, engineering and the life sciences.
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