Reduction of the Amount of Environmental Pollutants by Fermenting Pretreatment on Garbage Landfill

Abstract
For confirming the effect of aerobic fermenting pretreatment on garbage landfill, an outdoor test was carried out for around seven years. Unshredded garbage (lysimeter "A" ),shredded garbage (lysimeter "B" ), and fermented (composted) garbage (lysimeter "C" ) were set in each large-scaled lysimeter for simulating improved-sanitary landfill. After 7years, the depth of subsidence on the surface for one dry-weight kg of initial organic matter at lysimeter "C was 1.3 mm, which was less than those of the lysimeters "A" and "B" . Because of degradation of organic matter by the fermenting pretreatment, the weight loss at the lysimeter "C" was only 10kg, which was for 100 dry-weight kg of initial organic matter. Considering the effect of pretreatment on the mass balance of the lysimeter "C" landfill, the weight loss in the lysimeter "C" became 62 kg, which was almost the same as in the lysimeters "A" and "B" . Two kg of BOD leaching amount and three kg of gasified amount of methane in the lysimeter "C" were much less than those in the lysimeters "A" and "B" . These results indicate that the garbage pretreatment by aerobic fermentation in the landfill causes a large decrease in the amount of leachate pollutants, an early stabilization and small subsidence on the surface, and the effect of global warming prevention by reduction of CH4 gas evolution.

Key words: subsidence on landfill surface, aerobic fermenting pretreatment, garbage compost, CH4 gas evolution, environmental pollutant