Methane Production from Alginate-Extracted and Non-Extracted Waste of Laminaria japonica: Anaerobic Mono- and Synergetic Co-Digestion Effects on Yield

Mohammed M.M. Osman, Xiaohou Shao, Deling Zhao, Amir K. Basheer, Hongmei Jin and Yingpeng Zhang
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Mohammed M.M. Osman: College of Agricultural Engineering, Hohai University, Nanjing 210098, China
Xiaohou Shao: College of Agricultural Engineering, Hohai University, Nanjing 210098, China
Deling Zhao: Nanjing Institute of Industry and Technology, Nanjing 210023, China
Amir K. Basheer: College of Agricultural Engineering, Hohai University, Nanjing 210098, China
Hongmei Jin: Agricultural Biomass Conversion Lab, Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Yingpeng Zhang: Agricultural Biomass Conversion Lab, Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China

Sustainability, 2019, vol. 11, issue 5, 1-17

Abstract: This study investigated the potentiality of methane production from alginate-extracted (AEWLJ) and non-extracted (NAEWLJ) waste of Laminaria japonica through batch anaerobic fermentation in mono- and co-digestion with rice straw (RS) at different mixing ratios. Optimal C/N ratio was demonstrated, and system stability was monitored in terms of the total ammonia nitrogen, total volatile fatty acids, and pH throughout the digestion period. The results show that the combination of AEWLJ/RS at 67% mixing ratio generated the highest biogas yield of 247 NmL/gVS, which was 36% higher than the AEWLJ alone. The synergetic effect was clearly observed leading to an increase in the total methane yield up to 78% and 88%, respectively, for arrays of AEWLJ/RS and NAEWLJ/RS. The kinetic model showed a high coefficient of determination (R 2 ≥ 0.9803) when the modified Gompertz model was applied to predict methane production. These outcomes support the possibility of an integrated biorefinery approach to attain value-added products in order to achieve circular economies.

Keywords: Alginate-extracted waste; bioreactor batch mode; biofuel; C/N ratio balancing; synergetic effect (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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