Evaporation efficiency and important microorganisms under different ventilation strategies of co-bioevaporation process

Different ventilation strategies were investigated to find an energy-saving way for concentrated landfill leachate and food waste co-bioevaporation. The evaporation performance and energy consumption were compared, and important bacteria, archaea and fungi influenced by the ventilation strategy were investigated through Illumina-MiSeq sequencing. Results showed that the intermittent ventilation with 10 min on and 20 min off (IV1) was the most effective strategy for co-bioevaporation when compared with other strategies. The total removed mass of water and organics was 97.7% and 112.8% of those in continuous ventilation (CV), while the energy consumption was only 45.7% of CV. Distinctive differences in the diversity of bacteria and archaea under the two ventilations were obvious except for fungi. With IV1, the communities of bacteria and archaea were more diverse but the richness were lower. Aerobic bacteria were more abundant in CV (43.25% in IV1, 54.73% in CV) while anaerobic or facultative anaerobic bacteria were more abundant in IV1 (41.71% in IV1, 32.90% in CV) Anaerobic methanogens were much more abundant among the archaea in IV1 than those in CV. While genera of fungi under both conditions were similar. The colonization of microorganisms in co-bioevaporation piles was greatly influenced by the ventilation strategy. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Investigations on different ventilation strategies for concentrated landfill leachate and food waste co-bioevaporation revealed that intermittent ventilation with 10 min on and 20 min off (IV1) was the most effective strategy. This strategy resulted in higher removal efficiency of water and organics compared to continuous ventilation (CV) while consuming less energy. The diversity of bacteria and archaea were distinct between IV1 and CV, with IV1 showing higher diversity but lower richness. Anaerobic methanogens were significantly more abundant in IV1 than in CV, indicating a significant impact of ventilation strategy on microorganism colonization in co-bioevaporation piles.