TY - JOUR
T1 - Comprehensive monitoring and management of a long-term thermophilic CSTR treating coffee grounds, coffee liquid, milk waste, and municipal sludge
AU - Shofie, Mohammad
AU - Qiao, Wei
AU - Li, Qian
AU - Takayanagi, Kazuyuki
AU - Li, Yu You
N1 - Funding Information:
This work was partially supported by Chinese Universities Scientific Fund (2015QC034), National Natural Science Foundation of China (51408599) and Japan Society for the Promotion of Science (24-02053).
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - The CSTR process has previously not been successfully applied to treat coffee residues under thermophilic temperature and long term operation. In this experiment, the CSTR was fed with mixture substrate (TS~70g/L) of coffee grounds, coffee wastewater, milk waste and municipal sludge and it was operated under 55°C for 225days. A steady state was achieved under HRT 30days and OLR 4.0kg-COD/m3/d. However, there was an 35days inhibition with VFA accumulation (propionic acid 700-1900mg/L) when doubling the OLR by shortening HRT to 15days. But, an addition of microelements and sulfate (0.5g/L) in feedstock increased reactor resilience and stability under high loading rate and propionic acid stress. Continuous monitoring of hydrogen in biogas indicated the imbalance of acetogenesis. The effectiveness of comprehensive parameters (total VFA, propionic acid, IA/PA, IA/TA and CH4 content) was proved to manage the thermophilic system.
AB - The CSTR process has previously not been successfully applied to treat coffee residues under thermophilic temperature and long term operation. In this experiment, the CSTR was fed with mixture substrate (TS~70g/L) of coffee grounds, coffee wastewater, milk waste and municipal sludge and it was operated under 55°C for 225days. A steady state was achieved under HRT 30days and OLR 4.0kg-COD/m3/d. However, there was an 35days inhibition with VFA accumulation (propionic acid 700-1900mg/L) when doubling the OLR by shortening HRT to 15days. But, an addition of microelements and sulfate (0.5g/L) in feedstock increased reactor resilience and stability under high loading rate and propionic acid stress. Continuous monitoring of hydrogen in biogas indicated the imbalance of acetogenesis. The effectiveness of comprehensive parameters (total VFA, propionic acid, IA/PA, IA/TA and CH4 content) was proved to manage the thermophilic system.
KW - Coffee residues
KW - CSTR
KW - Stability
KW - Thermophilic
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U2 - 10.1016/j.biortech.2015.05.063
DO - 10.1016/j.biortech.2015.05.063
M3 - Article
C2 - 26038324
AN - SCOPUS:84930225739
SN - 0960-8524
VL - 192
SP - 202
EP - 211
JO - Bioresource Technology
JF - Bioresource Technology
ER -
