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The objective of this study is to test of applicability through the pilot scale using hybrid desulfurization media for the removal of hydrogen sulfide(H<sub>2</sub>S) in biogas, that generate in the anaerobic digestion processes in STP and can be utilized as renewable energy source. As a result, the 99% removal efficiency of H<sub>2</sub>S was obtained by applying hybrid media which can chemical adsorption mechanism of metal ions and biological mechanisms of microorganisms. Through the regeneration process of supplying oxygen of 0.5% of the biogas flow rate, the 99% removal efficiency of H<sub>2</sub>S was obtained during the operation period of 180 days. The adsorption amount of the hybrid desulfurization media was about 0.25 kg-H<sub>2</sub>S/kg-pellets.
The effects of hydrodynamic cavitation solubilization on methane production from waste sludge in anaerobic digestion reactor were researched by the BMP (biochemical methane potential) test and full scale test. As the results of BMP test, the cumulate methane yields before and after solubilization increased from 0.55 to 0.62 L-CH4/g-COD, respectively. The kinetic constant before and after solubilization were 0.0713 and 0.0987 d<sup>-1</sup>, respectively. As the results of full scale test, SCOD concentration of waste sludge before solubilization was 133~409 mg/L and after solubilization was 302~1,280 mg/L. Biogas production was increased from 6,500 m<sup>3</sup>/d to 7,100 m3/d by solubilization. At this point, methane yield after solubilization was higher about 1.1 times than before solubilization. As the hydrodynamic cavitation cycle was increased, the solubilization rate of waste sludge was enhanced and methane production in anaerobic digestion reactor was increased.
This study conducted a result analysis on operation of 26 Rural Community Sewage Treatment Plant (RCSTP) newly constructed in Yeong-yang, Bong-hwa and An-dong areas which are located at the uper region of An-dong Dam and Im-ha Dam. Based on operation result, an analysis on characteristics of sewage in each areas and the treatment efficiency of the installed treatment process was conducted. The result of analysis on characteristics of sewage has shown the difference in concentration of the sewage according to area characteristics. Sewage in areas with frequent occurrence of agricultural water and livestock wastewater had high concentration. It is important to select the most suitable treatment process when selecting a treatment process for RCSTP according to properties of sewage in each area. As a result of operation, the disposal efficiency for organic matter and suspended solids was stable with less fluctuation, but the disposal efficiency for nitrogen and phosphorus showed high fluctuation. This signifies that it is necessary to pay attention to operation condition management of aitrogen and phosphorus when operating RCSTP.