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Comparison of leachate percolation and immersion using different inoculation strategies in thermophilic solid-state anaerobic digestion of pig urine and rice straw. | LitMetric

AI Article Synopsis

  • Solid-state anaerobic digestion (SS-AD) faces limitations in methane production due to uneven substrate and microorganism distribution, along with low mass transfer.
  • This study aimed to identify the best inoculation method using solid digestate and an effective leachate circulation technique, finding that immersing rice straw in leachate outperformed percolation.
  • The optimal conditions for methane yield were determined to be a 24-hour immersion period combined with a slurry application, achieving a notable average methane production of 180 mL/g volatile solids.

Article Abstract

Heterogeneous distribution of substrate and microorganisms and low mass transfer limit methane production dramatically in solid-state anaerobic digestion (SS-AD). To overcome this challenge, this study determined the optimal inoculation strategy (complete premix/slurry application) for reusing solid digestate as inoculum and the optimal leachate circulation method (percolation/immersion) using batch digestion. Initially, percolation and immersion (1 h per 3 days) were compared and the result shows that immersing rice straw into leachate was superior to leachate percolation in methane production. Effect of the immersion period (24, 48 and 72 h) in each circulation cycle on methane production was then evaluated for each inoculation strategy. Methane production increased until the immersion period up to 24 h and then decreased, while the average cumulative methane yield with an immersion period of 24 h was (180 mL/g volatile solids). Slurry application with an immersion period 24 h is recommended as the optimum operating condition.

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Source
http://dx.doi.org/10.1016/j.biortech.2019.01.011DOI Listing

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