Sulfate-reduction behavior in waste-leachate transition zones of landfill sites

The sulfate reduction behavior of the waste-leachate transition zone of landfill was investigated at different temperatures and moisture contents. Marked differences in the sulfate reduction behavior were observed in the waste-leachate transition zone. The highest H2S concentration was observed when the solid-to-liquid ratio was 1:3 at both temperatures. Although more leachate led to higher H2S concentrations, the solid-to-liquid ratio was likely of subordinate significance compared with temperature. The microbial community was more unstable at 50 degrees C and more extensive mutualistic interactions among bacteria were observed, resulting in SRB showing a more violent response to changes in the solid-to-liquid ratio. At 25 degrees C, it's the opposite. A temperature of 25 degrees C was suitable for most SRB (such as Desulfomicrobium and Desulfobulbus), while some specific SRB that did not contain the functional genes (such as Dethiobacter and Anaerolinea) played a pivotal role in the significant differences in sulfate reduction behavior observed at 50 degrees C. This study provides a theoretical basis for controlling the release of H2S from landfill.

Automated summary

The sulfate reduction behavior in the waste-leachate transition zone of landfill was investigated at different temperatures and moisture contents. The study found marked differences in sulfate reduction behavior, with temperature playing a more significant role than the solid-to-liquid ratio. The microbial community composition and interactions also varied with temperature, contributing to the observed differences in sulfate reduction behavior.