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The influence of the total solid content on the stability of dry-thermophilic anaerobic digestion of rice straw and pig manure. | LitMetric

AI Article Synopsis

  • Dry anaerobic digestion effectively converts agricultural waste into energy and fertilizer but needs careful water management to balance handling and costs.
  • A study explored the impact of varying total solid (TS) content in a semi-batch thermophilic digester using rice straw and pig manure, finding optimal stable biogas production occurs at a TS content of 32%.
  • Exceeding a TS content of 28% led to reduced biogas yields and the production of unwanted volatile fatty acids, highlighting the importance of maintaining the right TS levels for efficient digestion.

Article Abstract

Dry anaerobic digestion is a promising technology for the recycling of agricultural waste to produce energy and fertilizer. Adding water to the substrate enables better handling and avoid inhibition caused by high total solid (TS) content in the reactor; however, it also increases leachate and operational costs. To assess the extent to which the amount of water added can be reduced, it was examined how the TS content in the reactor influenced the production of biogas. A semi-batch dry thermophilic anaerobic digester was fed with substrate (rice straw and pig manure) at a constant organic loading rate, and varied the TS contents (27%, 32%, 37%, and 42%) of the substrate by adding different amounts of water (representing 0-36% of the total substrate). During incubation, the TS content in the reactor gradually increased from 18% to 31%. Biogas production was stable and high (564 ± 13-580 ± 36 N m t VS), and there was no accumulation of volatile fatty acids when the TS content of the reactor was between 18% and 27%. However, the rate decreased sharply and propionate and acetate were also produced when the TS content of the reactor exceeded 28%. By applying a simple TS balance model, it was found that stable biogas production could be achieved at a substrate TS content of 32%, at which reactor TS content reached 23% at steady-state condition.

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Source
http://dx.doi.org/10.1016/j.wasman.2018.02.033DOI Listing

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