AI Article Synopsis
- High concentrations of volatile fatty acids (VFAs) can lead to failures in solid-state anaerobic digestion reactors, particularly when using rice straw and pig urine as feedstock.
- The study found that a feedstock-to-inoculum (F/I) ratio of 3 is optimal for stable reactor operation, while ratios of 4 and 6 resulted in reactor failure due to excessive VFA accumulation.
- Both biochar and inoculum additions were effective in reducing VFAs in failed reactors quickly, with biochar's buffering capacity playing a crucial role in this degradation process.
Article Abstract
A high concentration of accumulated volatile fatty acids (VFAs) is one of the most important factors resulting in reactor failure during solid-state anaerobic digestion. In this study, the feedstock-to-inoculum (F/I) ratio (0.5, 2, 3, 4 and 6) and the recovery method after failure (biochar addition or inoculum addition) were investigated in batch solid-state anaerobic digestion fed with rice straw and pig urine. An F/I ratio of 3 was the threshold for stable operation, while the reactors failed at F/I ratios of 4 and 6 because of high accumulated VFAs concentrations (above 30 g HAc/kg). Biochar addition (10% or 20% (wet weight) of the mixture) was as effective as inoculum addition (by adjusting the F/I ratio to 2 or 3) in promoting VFAs degradation in failed reactors within a short period (<1 day). The buffering capacity of biochar was important in promoting VFAs degradation.
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| http://dx.doi.org/10.1016/j.biortech.2020.123366 | DOI Listing |
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