Hydrogen sulfide adsorption using fine rubber particle media

摘要

Fine rubber particle media (FRPM) derived from consumer waste sources, such as discardedvehicle tires, has been found to adsorb hydrogen sulfide (H2S) from biogas. Compared withtraditional H2S adsorbents, economic advantages make FRPM a potentially attractive alternative.The challenge for FRPM reuse in biogas scrubbing applications is to increase its adsorptioncapacity so that it competes well with traditional adsorbents in terms of effectiveness and lifecycle cost. In this research, temperature and packing density were varied during H2Sbreakthrough tests. H2S removal by FRPM was optimized at a packing density of 75% of thecolumn volume, and the adsorption capacity increased with temperature. Adsorption capacityrecovery of FRPM following washing with a zinc solution (1g ZnCl_2/L) yielded an adsorptioncapacity of 120% of the original. A half strength solution (0.5g ZnCl_2/L) recovered 110% of theadsorption capacity after the first wash and 80% after the second wash.