New Sky Energy – Hydrogen Sulfide Removal

About the Solution:

New Sky Energy believes that their SulfurSolve^® process is by far the most sustainable and cost effective way to remove hydrogen sulfide from biogas streams. The SulfurSolve^® system uses a non-toxic, alkaline ferric iron solution to capture and convert H₂S into elemental sulfur. The hydrogen sulfide capture is instantaneous and complete, removing over 99.9% of H₂S in a single pass through a spray system. SulfurSolve^® is regenerated in situ simply by blowing air through the spent solution, which converts captured sulfide into elemental sulfur and regenerates the SulfurSolve^® solution for immediate reuse. Sulfur in the regeneration system floats and spills over a weir to a pressure filtration system that produces a damp dry sulfur cake suitable for land application with digester solids.

According to New Sky, SulfurSolve^® can be reused indefinitely, significantly reducing chemical purchasing and waste disposal costs relative to conventional single use scavengers or liquid redox technologies. The ferric iron-carbonate complex in SulfurSolve^® is inherently soluble in its alkaline buffer, not requiring high levels of expensive, easily degraded chelating agents like some similar liquid redox technologies.

Commercial scale SulfurSolve^® systems are currently removing H₂S to levels below 1 ppm in a single pass through a spray column system. By avoiding physical packing in scrubber columns SulfurSolve^® eliminates sulfur scaling, a common problem in most H₂S capture technologies. This is possible due to the rapid, direct reaction between the ferric iron complex and H₂S, forming iron sulfide, which is then converted to sulfur during regeneration. Competing liquid redox technologies that require chelating agents to solubilize iron rely on slower, less efficient and indirect reaction pathways. New Sky believes that SulfurSolve^®'s regenerable, direct reaction pathway differs from all known H₂S control technologies and makes SulfurSolve^® the most cost effective and sustainable way to treat H₂S in raw biogas streams.