Removal of hydrogen sulfide from an anaerobic biogas using a bio-scrubber

Abstract

A novel biological treatment process for removing hydrogen sulfide from anaerobic biogas using a bio-scrubber has been developed. The treatment process is composed of a gas/liquid contact tower and an aeration tank. The biogas from an anaerobic wastewater treatment process is introduced into a multiple-bubble-tray contact tower (bio-scrubber) and scrubbed with activated sludge liquor from an aeration tank. The sludge liquor containing sulfides is then returned to the aeration tank, where the sulfide is oxidized to sulfate by sulfur-oxidizing bacteria such as Thiobacillus. The contact tower is designed to be air tight in order to prevent air from mixing into the biogas used as a fuel. A simulation model was developed to calculate effluent gas concentrations from the contact tower, incorporating input parameters such as influent hydrogen sulfide concentrations, gas flow rates, and gas/liquid ratios. Using the simulation model, design criteria were calculated and a full-scale plant for treating biogas from a UASB process for potato processing wastewater was constructed. The data shows that the hydrogen sulfide in the biogas was effectively reduced from 2,000 ppm to less than 20 ppm.

Hydrogen sulfide removal by a novel fixed-film bioscrubber system

“…When the gas flow rate was reduced from 500 to 250 ml min À1 , hydrogen sulfide removal efficiency increased to more than 85%. The result was similar to that of Nishimura and Yoda [11]. Furthermore, A. faecalis MU2_03 exhibited 90% removal efficiency in only 2 h whereas with Acinetobacter sp.…”

“…The sulfate values increased when removal efficiencies increased [11,16]. In this experiment, sulfate production increased when H 2 S removal increased.…”

“…The greatest advantage of bioscrubbers is their ability to deal with high odor concentrations and also severe fluctuation. The removal efficiencies of bioscrubbers are in the region of 90-99% [7,11].…”

Development of a Biofilter with Tire-Derived Rubber Particle Media for Hydrogen Sulfide Odor Removal

“…Among the biological processes, biofilters, biotrickling filters, rotating biological contactors, bioscrubbers, and suspended cell bioreactors are commonly used for hydrogen sulfide removal treatment (Shareefdeen and Singh 2005). Several biological methods of odor treatment have been developed and used with good results (Morton et al 2005;Nishimura and Yoda 1997;Wolstenholme and Schafer 2005). In consideration of these biological odor removal systems, filter media is one of the most critical factors by providing biomass surface to attach and contact with contaminants (Shareefdeen and Singh 2005).…”

Adsorbing H2S onto a single graphene sheet: A possible gas sensor

“…43 Several industrial processes generate a huge amount of H 2 S, including natural gas processing, petroleum refining, coal gasification, biogas fermentation, and the activity of petrochemical plants, Kraft mills, and coke ovens. 43 During the process of the biogas fermentation, a huge amount of H 2 S is produced [44][45][46] because the biogas must be purified from H 2 S. Inhaled H 2 S is very harmful and can cause death depending on the concentration and the exposure duration. From the above, it is clear that the adsorption of H 2 S on graphene is a very important problem.…”