D. in all of these ways 42. After aerobic waste decomposition in a landfill has stopped, A. no further breakdown of wastes occurs. B. further leachate is harmless. C. further decomposition produces different gases, including methane. D. methane production also ceases in the absence of oxygen.
Incineration can provide energy as a by-product.
Another waste-disposal method that can supply useful fuel is A. open dumping with burning. B. sanitary landfill. D. deep-well disposal. In a landfill, A. the goal is always to keep the wastes as dry as possible. B. the wastes must be kept saturated to prevent escape of gas.