Microbial Modification Enhances Organic Sulfur Removal Capability of Chelated Iron Solution for Natural Gas
Abstract
Feedstock natural gas typically contains sulfur compounds, such as hydrogen sulfide (H2S), carbonyl sulfide (COS), and methyl mercaptans (MeSH), which require removal before pipeline transportation. The chelated iron process, a liquid-phase oxidation method, is widely employed for desulfurizing refinery gas, natural gas, and biogas due to its low capital investment, operational simplicity, and cost-effectiveness. While highly efficient for H2S removal, the chelated iron process exhibits limited effectiveness against organic sulfur compounds like COS and MeSH, restricting its applicability. Certain microorganisms demonstrate strong organic sulfur removal capabilities. While biodesulfurization effectively treats low-sulfur streams, its standalone configuration shows inadequate removal for high-concentration H2S, primarily due to microbial inhibition at elevated sulfur loads. This study has developed a novel desulfurization technology that integrates biological desulfurization with chelate iron desulfurization, namely, the biochelated iron system. Desulfurizing strain TYWJ-1 was isolated from a purification facility. Its optimal growth conditions were determined using Box-Behnken response surface methodology (RSM), and its sulfur compound removal mechanisms were elucidated through whole-genome analysis. Compared to chelated iron solution, the biochelated iron system significantly enhanced removal efficiency of H2S, MeSH, and COS. For ternary mixtures (H2S/COS/MeSH), chelated…
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