TY - JOUR
T1 - Improvement of coffee grounds high solid thermophilic methane fermentation by co-digestion with in-situ produced waste activated sludge
T2 - Performance and stability
AU - Zhang, Tao
AU - Tonouchi, Kazuki
AU - Kong, Zhe
AU - Li, Yemei
AU - Cheng, Hui
AU - Qin, Yu
AU - Li, Yu You
N1 - Funding Information:
The authors would like to thank Kazuyuki Tonouchi, whose great contribution to this study is deeply appreciated. The overseas study conducted by the first author was supported by China Scholarship Council (CSC, No. 201606260047 ).
Funding Information:
The authors would like to thank Kazuyuki Tonouchi, whose great contribution to this study is deeply appreciated. The overseas study conducted by the first author was supported by China Scholarship Council (CSC, No. 201606260047).
Publisher Copyright:
© 2020
PY - 2021/4/15
Y1 - 2021/4/15
N2 - The feasibility of in-situ stabilization in the co-digestion of coffee grounds (CG) and waste activated sludge (WAS) was investigated. Two lab-scale thermophilic continuous stirred tank reactors (CSTR), R1 and R2 were operated with substrates that contained different WAS ratios, S1 (WAS% = 20%) and S2 (WAS% = 30%). During the whole process, there was no external supply of ammonia and trace elements. The volatile solid (VS) removal efficiency of R1 and R2 was comparable, and the biogas yield of R1 (0.467 ± 0.100 L/g-VSin) was slightly higher than R2 (0.408 ± 0.020 L/g-VSin). The total ammonia nitrogen (TAN) of R1 and R2 was 482 ± 32 and 884 ± 24 mg/L, respectively. The stoichiometry formulas of co-digestion were established to calculate the theoretical microbial yield coefficients and the requirements of microorganism reproduction. A comparison between the theoretical requirements and experimental values showed that co-digestion with WAS could avoid supply for an external supply of minerals. For the net energy production, R1 and R2 could generate 6342 and 5069 kWh of electricity daily, respectively.
AB - The feasibility of in-situ stabilization in the co-digestion of coffee grounds (CG) and waste activated sludge (WAS) was investigated. Two lab-scale thermophilic continuous stirred tank reactors (CSTR), R1 and R2 were operated with substrates that contained different WAS ratios, S1 (WAS% = 20%) and S2 (WAS% = 30%). During the whole process, there was no external supply of ammonia and trace elements. The volatile solid (VS) removal efficiency of R1 and R2 was comparable, and the biogas yield of R1 (0.467 ± 0.100 L/g-VSin) was slightly higher than R2 (0.408 ± 0.020 L/g-VSin). The total ammonia nitrogen (TAN) of R1 and R2 was 482 ± 32 and 884 ± 24 mg/L, respectively. The stoichiometry formulas of co-digestion were established to calculate the theoretical microbial yield coefficients and the requirements of microorganism reproduction. A comparison between the theoretical requirements and experimental values showed that co-digestion with WAS could avoid supply for an external supply of minerals. For the net energy production, R1 and R2 could generate 6342 and 5069 kWh of electricity daily, respectively.
KW - Ammonia
KW - Anaerobic co-digestion
KW - Coffee grounds
KW - High-solid
KW - Trace elements
KW - Waste activated sludge
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U2 - 10.1016/j.scitotenv.2020.142551
DO - 10.1016/j.scitotenv.2020.142551
M3 - Article
C2 - 33092842
AN - SCOPUS:85092762295
SN - 0048-9697
VL - 765
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 142551
ER -