TY - JOUR
T1 - Biogas recovery from two-phase anaerobic digestion of food waste and paper waste
T2 - Optimization of paper waste addition
AU - Qin, Yu
AU - Wu, Jing
AU - Xiao, Benyi
AU - Hojo, Toshimasa
AU - Li, Yu You
N1 - Funding Information:
This research was supported by the Japan Society for the Promotion of Science (JSPS, 16J02584 ). The authors would also like to appreciate the financial support from the China Scholarship Council (CSC, 201206230087 and 201504910086 ). We gratefully acknowledge the financial support from the Japan Science and Technology (JST) in the Japanese-Chinese Research Cooperative Program on “ Research and Development to Find Solutions to Environmental and Energy Issues in Urban Areas ” ( 16769220A ).
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/9/1
Y1 - 2018/9/1
N2 - In order to optimize the biogas recovery from the co-digestion of food waste (FW) and paper waste (PW), the effect of PW content on two-phase anaerobic digestion (TPAD) was investigated. The mixtures of FW and PW, with the ratios of 10:0, 8:2, 6:4 and 5:5 (total solids), were fed into TPAD to recover biomethane. After the long-term expriment, it is elucidated that the methanogenesis in TPAD was stable for PW ≤ 40%. When PW = 50%, NH4HCO3 was added to the methanogenic phase to provide nitrogen. As the indicators of the stability of the anaerobic process, the ammonia and alkalinity in the methanogenic phase were simulated for their decreasing trend. The simulation results quantified the nitrogen deficiency in the methanogenic phase for PW = 50%. Also, the comparison of alkalinity and ammonia revealed that ammonia was the major contributor to the alkalinity. Furthermore, via stoichiometric calculations, high C/N ratios were found to increase the microbial yield and exacerbated the nitrogen deficiency. In the energy estimation, adding PW showed significant increase only when PW ≥ 40%. It was concluded that 40% was the optimal PW content for bioenergy augmentation from co-digestion of FW and PW using TPAD.
AB - In order to optimize the biogas recovery from the co-digestion of food waste (FW) and paper waste (PW), the effect of PW content on two-phase anaerobic digestion (TPAD) was investigated. The mixtures of FW and PW, with the ratios of 10:0, 8:2, 6:4 and 5:5 (total solids), were fed into TPAD to recover biomethane. After the long-term expriment, it is elucidated that the methanogenesis in TPAD was stable for PW ≤ 40%. When PW = 50%, NH4HCO3 was added to the methanogenic phase to provide nitrogen. As the indicators of the stability of the anaerobic process, the ammonia and alkalinity in the methanogenic phase were simulated for their decreasing trend. The simulation results quantified the nitrogen deficiency in the methanogenic phase for PW = 50%. Also, the comparison of alkalinity and ammonia revealed that ammonia was the major contributor to the alkalinity. Furthermore, via stoichiometric calculations, high C/N ratios were found to increase the microbial yield and exacerbated the nitrogen deficiency. In the energy estimation, adding PW showed significant increase only when PW ≥ 40%. It was concluded that 40% was the optimal PW content for bioenergy augmentation from co-digestion of FW and PW using TPAD.
KW - C/N ratio
KW - Co-digestion
KW - Energy augmentation
KW - Mixing ratio
KW - Simulation
KW - TPAD
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U2 - 10.1016/j.scitotenv.2018.03.341
DO - 10.1016/j.scitotenv.2018.03.341
M3 - Article
C2 - 29660874
AN - SCOPUS:85045274560
SN - 0048-9697
VL - 634
SP - 1222
EP - 1230
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -