No abstract

This study was performed to evaluate the effects of the volume fraction of an anaerobic reactor (VFAR) and SRT on the removal of T-N and T-P in both an intermittently aerated system (IAS) and intermittently aerated dynamic-flow system (IADS), respectively. When the VFAR in the total volume of reactor from both IAS and IADS are 13%, 7%, and 0% at 5 days of SRT, the removal efficiencies of T-P were 80-87%, 62-65% and <30%, respectively. However, it was observed from this study that the removal efficiencies of T-N and T-P were not correlated to VFAR at a predetermined SRT, producing greater than 5000 mg/L of MLVSS. Also, IADS was shown to have the greater buffer capacity and adaptability to resist the shock due to the loading of high concentration of N. Furthermore, IADS achieved over 80% of removal efficiency of N even at much lower C/N ratio of 4.7. Therefore, it seems that IADS has the significant advantages over other biological nutrients removal processes.

This study was performed to investigate the characteristics of nutrient removal of municipal wastewater in membrane bioreactor system. Membrane bioreactor consists of four reactors such as two intermittently anaerobic tanks, the oxic tank and the sludge solubilizaion tank with an internal recycle. The hydraulic retention time (HRT) and flux were 6.5 hours and 20.4 L/m 2 ․hr (LMH), respectively. The removal efficiency of CODCr, SS, TN and TP were 94.0%, 99.3%, 99.9%, 69.9%, and 66.9%, respectively. The estimated true biomass yield, specific denitrification rate (SDNR), specific nitrification rate (SNR), specific phosphorus release rate (SPRR) and specific phosphorus uptake rate (SPUR) were 0.34 kgVSS/kgBOD․d, 0.067 mgNO3-N/mgVSS․d, 0.028 mgNH4-N/mgVSS․d, 16.0 mgP/gVSS․d and 2.1 mgP/gVSS․d, respectively. The contents of nitrogen and phosphorus of biomass were 8.9% and 3.5% on an average.

The present paper briefly overviews the latest progress in R&D for technologies for CO2 storage in marine geological structure in Korea, which has been launched in 2005 as one option of portfolio to mitigate climate change. In line with the fact that carbon dioxide capture and storage (CCS) technology has been globally entered in the stage of deployment as one of mitigation technologies to reduce the emission of CO2 into the atmosphere during the last 10 years, the Republic of Korea, the Ministry of Maritime Affairs and Fisheries (MOMAF) also started relevant R&D project, which cover the initial survey of potentially suitable marine geological structure for CO2 storage site and identification of its characteristic, basic design for CO2 capture and storage process and potential assessment of environmental risk related to CO2 storage in geological structure in Korea.