A Study on Removal Hydrogen Sulfide Generating Anaerobic Digestion Reactor from Livestock Wastewater Treatment Using Recycled Building Waste

Hydrogen sulfide (H2S) is corrosive and toxic malodorant produced during the anaerobic digestion process at livestock wastewater treatment plants. A variety of techniques have been developed effectively and economically to remove the H2S gas. Iron oxide is widely used as an absorbent in desulfurization system, and has been tried to improve its performance. One of the method is a surface modification using alkaline substances for increasing the removal efficiency of H2S caused by acid-base reaction. The aim of this study are to developed desulfurization absorbents using iron oxide with recycling building waste, and to select the optimum production and alkaline impregnation conditions. For these purpose, we conducted lab scale column test to compare with H2S removal efficiency depending on loading rate(10, 20, 30 w%) of NaOH and KOH solution, and then conducted field test to evaluate removal efficiency of H2S emitted from the anaerobic digestion reactor set on a test-bed using selected optimum absorbent. In the results of tests, the optimum impregnation condition was to be impregnated with 20 wt% NaOH, and also H2S was effectively maintained removal efficiency at over 99% during 75 days in the field test.