Application of ZnO Nanoparticles in Control of H2S Emission from Low-Temperature Gases and Swine Manure Gas
2017
Awume, Bennet | Tajallipour, Mehdi | Nemati, Mehdi | Predicala, Bernardo
Zinc oxide nanoparticles were evaluated for the removal of hydrogen sulfide from low-temperature gases, as well as swine manure gas using laboratory and semi-pilot scale systems. Effects of gas flow rate (200 and 450 mL min⁻¹), H₂S concentration (90–1500 ppmv), temperature (1–41 °C), and particle size (18, 80–200 nm) were investigated in the laboratory scale system using premixed gases (H₂S-balanced N₂). The breakthrough and equilibrium adsorption capacities increased with an increase of H₂S concentration. Application of high gas flow rates saturated the adsorbent faster and decreased the adsorption capacities. Adsorption capacities of 18 nm particles were higher than those of 80–200 nm. Regardless of H₂S concentration, the equilibrium adsorption capacity was not affected by temperature in the range 1 to 22 °C but increased when a higher temperature of 41 °C was applied. Among the evaluated isotherms, Langmuir-Freundlich described the equilibrium data obtained with 18 and 80–200 nm particles with a higher level of accuracy. Experiments in a semi-pilot scale adsorption system with 18 nm ZnO and gases emitted from the stored swine manure demonstrated the effectiveness of ZnO nanoparticles in removal of H₂S from these representative gases. Specifically, treatment of manure gas in the semi-pilot scale adsorption system decreased the level of H₂S from an average inlet value of 235.7 ± 85.2 ppmv to a negligible level.
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