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Comment PDF Environment, Health, Safety & Security

Technologies for Controlling H2S

By Christopher Ristevski, Rosanna Kronfli, MacroTek |

There are many industrial technologies for removing H 2 S from process gas, and each brings with it different benefits with regard to costs, efficiency and equipment layout Hydrogen sulfide (H 2 S) is a toxic and corrosive gas that occurs naturally, but can also be produced through many industrial processes. In addition, H 2 S has an odor threshold of 0.01–0.15 parts per million (ppm), according to the Occupational Safety and Health Administration (OSHA; Washington, D.C.; www.osha.gov). Due to the very low odor threshold, in countries where nuisance odor is regulated, H 2 S removal from process gas or off-gas is required. Since H 2 S is produced through anaerobic digestion, it is prevalent where organic matter and sulfates are present. As a result, pipeline gas specifications exist to ensure gas quality. Furthermore, when natural gas, synthesis gas (syngas) or biogas is used in turbines or engines for power generation, H 2 S concentrations cannot exceed the engine manufacturer’s specifications, due to corrosion concerns. During combustion, H 2 S is oxidized to sulfur dioxide — a highly regulated air pollutant — which necessitates its removal before combustion. It is clear that H 2 S removal is important for the environment,…
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