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Abstract ▼ AI-Helper

This study investigated characteristics of nitrification/denitrification rate using PVA (Polyvinyl Alcohol) gel immobilized with specific microorganisms. The media for nitrification and denitrification were producted by immobilizing nitrifying microorganisms (Nitrosomonas europaea and Nitrobacter sp...

This study investigated characteristics of nitrification/denitrification rate using PVA (Polyvinyl Alcohol) gel immobilized with specific microorganisms. The media for nitrification and denitrification were producted by immobilizing nitrifying microorganisms (Nitrosomonas europaea and Nitrobacter spp.) and denitrifying microorganisms (Psuedomonas, Bacillus and Paracoccus), respectively. When the media filling rate was the 15% (v/v), the microorganism - immobilized media indicated optimum efficiency. The nitrification rate was $12.53mg\;{NH_4}^+-N/L{\cdot}hr$ and the denitrification rate was $20.37mg\;{NO_3}^--N/L{\cdot}hr$, which was faster than the conventional reaction rate (nitrification: $3.93mg\;{NH_4}^+-N/L{\cdot}hr$). In order to confirm microbial immobilization, SEM/EDX (Scanning Electron Microscopy/Energy Dispersive X-ray Analyser) analysis of media before and after immobilization was conducted. It showed that the contents of C and N increased from 58.5% and 3.85% to 70.75% and 7.69%, respectively. These results suggest that application of microorganism immobilized media improves treatment efficiency and can also reduce the size of the treatment facility.

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