AI Article Synopsis
- Bioaugmentation can help reduce ammonia-induced microbial inhibition in anaerobic digestion, but it faces challenges like high costs and complex cultivation methods.
- Using nondomesticated mixed microbial consortia showed a significant increase in methane production by 5.6%-13.5% at various ammonia levels.
- The effectiveness of bioaugmentation is influenced by the type of microbial consortium used and the amount applied, indicating that nondomesticated consortia could be a cost-effective solution for this issue.
Article Abstract
Bioaugmentation shows promise in mitigating ammonia-induced microbial inhibition in anaerobic digestion processes. However, the advanced technical requirements and high costs associated with pure strain cultivation, as well as the time-consuming and labor-intensive process of domesticating consortia, present challenges for industrial applications. Herein, the efficacy of bioaugmentation with nondomesticated mixed microbial consortia was evaluated, which resulted in a significant methane production improvement of 5.6%-11.7% and 10.3%-13.5% under total ammonia nitrogen concentrations of 2.0 and 4.9 g-N/L, respectively. Microbial analysis revealed that at high ammonium levels, the bioaugmented culture facilitated a transition in the methanogenic pathway from acetoclastic to hydrogenotrophic by regulating symbiotic relationships between propionate- and acetate-oxidizing bacteria and methanogens. Consortium type and dose applied were identified as crucial factors determining bioaugmentation effectiveness. Overall, nondomesticated mixed microbial consortia demonstrate potential as cost-effective bioaugmentation agents for mitigating ammonia-induced inhibition.
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| http://dx.doi.org/10.1016/j.biortech.2023.129954 | DOI Listing |
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