Details

Autor(en) / Beteiligte

• Chakraborty, Debkumar
• Karthikeyan, Obulisamy Parthiba
• Selvam, Ammaiyappan
• Palani, Sankar Ganesh
• Ghangrekar, Makarand M.
• Wong, Jonathan W.C.

Titel

Two-phase anaerobic digestion of food waste: Effect of semi-continuous feeding on acidogenesis and methane production

Ist Teil von

• Bioresource technology, 2022-02, Vol.346, p.126396-126396, Article 126396

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2022

Quelle

MEDLINE

Beschreibungen/Notizen

• [Display omitted] •Semi-continuous FW addition generated stable leachate after 10 days.•Acetate was the single dominant VFA (65%) in semi-continuous LBR leachate.•Lower H2 to CO2 ratio in the headspace of test LBR enhanced acetate production.•Methane generation from test LBR leachate was three times higher than the control. 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.