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42,318,000 Yen (FY1994 14,958,000 Yen)
For this study green house effect gas nitrous oxide(N2O) produced in the domestic wastewater treatment process control technique has been carried out N2O can in principal be emitted from both biological nitrification and denitrification in the biological wastewater treatment process, perceiving digestion reaction, it was examined emitted mechanisms using batch cultivation system in this study firstly. As a results, it was effective keeping up low nitrate concentration in water to control N2O emission, there is necessity for connecting anaerobic operation to keep in the reactor as typical nitrogen, phosphorus and nutrients removal process.
The effect on N2O emission control as mainly investigated using intermittent aeration process and continuous aeration process that are one of the nitrogen and phosphorus removal processes and general wastewater treatment process, in this experiment. As a result, it was proved that nitrate concentration was maintained lower and N2O emission was about 1/20 only in the intermittent aeration process compare with continuous aeration process.
Life-cycles of several kinds of beverage containers were examined and energies consumed during whole their life-cycles was analyzed for deriving better way of their recycling. With respect to PET beverage bottles and PSP food trays, possible alternatives for their recycling were described and evaluated in terms of energy consumption and saving. The life-cycle energy analysis was also carried out concerning an incineration facilities for municipal waste with power generation plant to balance its accounts of life-cycle energy and carbon dioxide.
Global warming gas control, Wastewater treatment, Waste, Recycle, Energy recovery, LCA