Ferrous activated sodium percarbonate for controlling sulfide and methane production in sewer sediment.

Methane (CH4) and hydrogen sulfide (H2S) production from sewers are significantly driven by microbial activities in anaerobic sediments. This study proposes a novel ferrous activated sodium percarbonate advanced oxidation process to inhibit CH4 and H2S production. By targeting microbial activity in the top layer (0-2 cm), the process achieved 74.8 ± 4.3 % and 60.5 ± 2.5 % reductions in CH4 and H2S production, respectively. The generated free radicals (O2-, OH, and CO32-) compromised cellular integrity and disrupted intracellular enzyme systems. Enhanced hydrolytic enzyme activities and inhibition of enzymes involved in CH4 and H2S production pathways facilitated organic matter retention and transformation. Microbial community analysis confirmed a decrease in sulfate-reducing bacteria and methanogenic archaea, while hydrolytic acidogenic bacteria increased. This study demonstrates a sustainable and effective oxidation-based strategy for integrated sewer gas control and improved wastewater treatment systems performance.