TY - JOUR
T1 - Two-phase anaerobic digestion of food waste
T2 - Effect of semi-continuous feeding on acidogenesis and methane production
AU - Chakraborty, Debkumar
AU - Obulisamy, Parthiba Karthikeyan
AU - Selvam, Ammaiyappan
AU - Palani, Sankar Ganesh
AU - Ghangrekar, Makarand M.
AU - Wong, Jonathan W. C.
N1 - Funding Information:
The authors thank the Research Grant Council of the Hong Kong Special Administrative Region (Grant HKBU262013) for the financial support.
Publisher Copyright:
© 2021 Elsevier Ltd.
PY - 2022/2
Y1 - 2022/2
N2 - In present investigation, effect of diverting acidogenic off-gas from leached bed reactor (LBR) to up-flow anaerobic sludge blanket (UASB) reactor during semi-continuous food waste (FW) anaerobic digestion was evaluated. In test LBR headspace pressure (3.3 psi) was maintained with intermittent headspace gas transfer into UASB. In control, same headspace pressure was maintained without gas transfer. The semi-continuous FW addition affected the characteristics and production of leachate in control and test LBR. The cumulative COD, total soluble products and methane yields were 1.26, 1.37 and 3 times higher in the test LBR than the control. The acetate and methane yields from test LBR were 697.8 g·kgVSadded−1 and 167.55 mL·gCOD−1feeding. Acidogenic gas transfer maintained low partial pressure of hydrogen and the hydrogen to carbon-di-oxide ratio in the headspace of LBR, which were thermodynamically favorable for microbial metabolism and concomitant high-rate production of acetate-rich volatile fatty acid and methane-rich biogas from FW.
AB - In present investigation, effect of diverting acidogenic off-gas from leached bed reactor (LBR) to up-flow anaerobic sludge blanket (UASB) reactor during semi-continuous food waste (FW) anaerobic digestion was evaluated. In test LBR headspace pressure (3.3 psi) was maintained with intermittent headspace gas transfer into UASB. In control, same headspace pressure was maintained without gas transfer. The semi-continuous FW addition affected the characteristics and production of leachate in control and test LBR. The cumulative COD, total soluble products and methane yields were 1.26, 1.37 and 3 times higher in the test LBR than the control. The acetate and methane yields from test LBR were 697.8 g·kgVSadded−1 and 167.55 mL·gCOD−1feeding. Acidogenic gas transfer maintained low partial pressure of hydrogen and the hydrogen to carbon-di-oxide ratio in the headspace of LBR, which were thermodynamically favorable for microbial metabolism and concomitant high-rate production of acetate-rich volatile fatty acid and methane-rich biogas from FW.
KW - Anaerobic digestion
KW - Food waste
KW - Hydrogen partial pressure
KW - Leached bed reactor
KW - Semi-continuous operation
KW - Two-stage digestion
UR - http://www.scopus.com/inward/record.url?scp=85121144318&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2021.126396
DO - 10.1016/j.biortech.2021.126396
M3 - Journal article
C2 - 34822991
AN - SCOPUS:85121144318
SN - 0960-8524
VL - 346
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 126396
ER -
