Abstract
The volumes and mechanisms of CH4 and N2O emission, wastewater treatment characteristics and constituent microanimals and microalgae in lagoon system were studied. The lagoon system plays an important role in wastewater treatment in developing countries. Various microanimals such as protozoa and metazoa were observed in lagoon system. It revealed that the microfauna in the lagoon consist of various microanimals that are suitable for anaerobic and aerobic conditions. The conversion ratio from influent nitrogen to N2O in a bench-scale lagoon system was estimated as 0.21% for N2O emitted into the atmosphere and 0.22% for N2O dissolved in treated water, and the result showed a large proportion of N2O released into the water environment in dissolved form. The conversion ratio from influent BOD to CH4 in the bench-scale system was estimated as 17%.
