VOCarb® UOCH-KP odor control carbon is manufactured using selected coal based activated carbons by their impregnation with potassium hydroxide. This carbon is very effective for catalytically oxidizing H2S to elemental sulfur and mercaptans to their corresponding disulfides. The carbon captures and retains acidic gases such as HCl and SO2 as non-volatile salts. The high surface area of the carbon greatly enhances its ability to remove volatile organic compounds from the gas stream being treated.
Most air streams requiring treatment for odors contain high levels of CO2, an acidic gas that forms carbonates and bicarbonates in the presence of alkali metals such as sodium and potassium. Because of their low water solubility, odor control carbons containing NaOH allow the deposition of carbonates and bicarbonates within the pore structure and on the carbon surface of the carbon substrate. This reduces the adsorption capacity and increases system pressure drop, negatively affecting both performance and operating costs. Evoqua selects KOH (potassium hydroxide) as the impregnant because of the high solubility of K2CO3 (potassium carbonate) in water. Consequently, the carbonates which form do not plug the carbon’s pores and the performance of VOCarb UOCH-KP carbon is relatively unaffected by the presence of CO2.