Removal of Hydrogen Sulfide from Swine-Waste Biogas on a Pilot Scale Using Immobilized Paracoccus versutus CM1.

ABSTRACT: Hydrogen sulfide (H₂S) is a toxic and corrosive component that commonly occurs in biogas. In this study, H₂S removal from swine-waste biogas using sulfur-oxidizing Paracoccus versutus CM1 immobilized in porous glass (PG) and polyurethane foam (PUF) biofilters was investigated. Bacterial compositions in the biofilters were also determined using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). The biofilters were first tested on a laboratory scale under three space velocities (SV): 20, 30, and 40 h^-1. Within 24 h, at an SV of 20 h^-1, PG and PUF biofilters immobilized with P. versutus CM1 removed 99.5% and 99.7% of H₂S, respectively, corresponding to the elimination capacities (EC) of 83.5 and 86.2 gm^-3 h^-1. On a pilot scale, with the horizontal PG-P. versutus CM1 biofilter operated at an SV of 30 h^-1, a removal efficiency of 99.7% and a maximum EC of 113.7 gm^-3 h^-1 were achieved. No reduction in methane content in the outlet biogas was observed under these conditions. The PCR-DGGE analysis revealed that Paracoccus, Acidithiobacillus, and Thiomonas were the predominant bacterial genera in the biofilters, which might play important roles in H₂S removal. This PG-P. versutus CM1 biofiltration system is highly efficient for H2S removal from swine-waste biogas.

SUBMITTER: Kumdhitiahutsawakul L 

PROVIDER: S-EPMC9693040 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature