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

• DOI: 10.1016/j.jhazmat.2021.128199
• Publication Date: 2022-01-03T22:22:10Z
• Authors: Wenyi Yang; Manting Ci; Lifang Hu; Zhen Shen; Chengran Fang; Yuyang Long
• Keywords: Waste Disposal Facilities; Bacteria; Sulfates; Microbiota; 01 natural sciences; 0105 earth and related environmental sciences

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 °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 °C, it's the opposite. A temperature of 25 °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 °C. This study provides a theoretical basis for controlling the release of H2S from landfill.