Evaluation of surface properties of exhausted carbons used as H2S adsorbents in sewage treatment plants

Effect of pH and Surface Chemistry on the Mechanism of H2S Removal by Activated Carbons

“…This study is a continuation of our research on the performance of wood-based activated carbons as adsorbents of hydrogen sulfide (11)(12)(13)(14). The comparison of the breakthrough results along with the proposed general mechanism of oxidation was presented elsewhere (13).…”

“…Very often the risk of in situ fire is high (11). An example of the application of activated carbons impregnated with caustics is the removal of hydrogen sulfide from vent air in sewage treatment plants.…”

“…An example of the application of activated carbons impregnated with caustics is the removal of hydrogen sulfide from vent air in sewage treatment plants. The disadvantages of such carbons directed our attention toward studying virgin carbons as adsorbents of hydrogen sulfide (11)(12)(13)(14). Although the catalytic oxidation of H 2 S by virgin carbons at high temperature (Ͼ400 K) is known (15)(16)(17), their performance at the conditions close to ambient is still not fully understood and the factors which govern it are not well defined (13, 18 -21).…”

Effect of Surface Characteristics of Wood-Based Activated Carbons on Adsorption of Hydrogen Sulfide

“…An example of this is carbons impregnated with caustics, which are widely used for removal of acidic gases such as hydrogen sulfide in municipal water treatment facilities (7). Although the removal of odorous H 2 S from off-stream gases is very effective, those carbons have a very low self-ignition temperature (7) and can ignite spontaneously. Another disadvantage of caustic carbons is the oxidation of hydrogen sulfide to elemental sulfur (4,5), which cannot be removed from carbons by washing with water.…”

Efficient Air Desulfurization Catalysts Derived from Pig Manure Liquefaction Char

“…The efficient removal of H 2 S has been a major issue in industrial processes. Among the various sulfur removal techniques, adsorption on carbon-based materials at an ambient temperature and pressure has been found to be economical and cost-effective for medium and small-scale sulfur removal units [6][7][8][9].…”