Abstract
The effect of some factors, which are important to design an aerobic sanitary landfill, on aerobic decomposition of artificially made refuse-typical in this nationin laboratory scale, continuously air-forced static piled layer was experimentally discussed. In order to estimate the effect, temperature inside the layer and gas concentration of exhaust, etc. were measured for about one month, followed by calculating the total quantity of carbon-dioxide and water evolution, oxygen consumption, the decrease of dry refuse, etc. Consequently, the variations of temperature and concentration with time have 2 or 3 peaks within about 2 weeks and chief decomposed component seems to be hydrocarbon. The decreased weight of dry refuse attains to 30-40% of initial refuse and to 2-4 times more than volatile matter of garbage and the decreased weight of summer-type refuse is defferent from that of winter-type refuse. Anaerobic duration till start of aerating less than 2 days has little effect on decomposition. Too high and too low piled density of the layer give morse decomposition. Even refuse with such low garbage content as 12% can give steady decomposition. Plastic in refuse, especially film results in worse decomposition. For the purpose of energy saving and speedy decomposition, 1 mol oxygen/d/kg of dry initial refuse, or 110 1 air/d/kg is appropriate. Moisture content of refuse less than 70% is desired for steady decomposition. These conclusions are also useful to understand the phenomena in composting process or semiaerobic sanitary landfill.
