NOVELTY - Reclaimable bioreactor (I) landfill cell (10) comprising a bottom lining configured to direct leachate deposited on the bottom lining to at least one collection region (17), a leachate drainage pipe operatively associated with each collection region to receive leachate deposited on the bottom lining, and a porous pavement layer overlying the leachate drainage pipe.    USE - (I) is useful for biodegrading municipal solid waste which involves: (a) providing a quantity of municipal solid waste, promoting anaerobic digestion in the quantity of municipal solid waste by methanogenic organisms to produce methane, determining when the production of methane from the quantity of municipal solid waste subsides, and promoting aerobic digestion of the quantity of municipal solid waste; or (b) providing a bioreactor cell comprising a leachate collection and recirculation system and a gas collection and delivery system, providing a quantity of municipal solid waste, determining the properties of the quantity of municipal solid waste, such as decomposable municipal solid content, moisture content, nitrogen content, pH, phosphorus content, potassium content, calcium content, magnesium content, chlorine content, sulfur content, iron content, copper content, manganese content, zinc content, molybdenum content, nickel content and vanadium content, amending the quantity of municipal solid waste a necessary to bring the at least one property within select parameters, loading the quantity of municipal solid waste into the bioreactor cell in operative association with the leachate collection and recirculation system and the gas collection and delivery system, promoting anaerobic digestion in the quantity of municipal solid waste by methanogenic organisms to produce methane, recirculating leachate collected by leachate collection and recirculation system to the quantity of municipal solid waste, supplementing the liquid of the leachate collection and recirculation system as necessary to maintain the liquid content of the quantity of municipal solid waste at its field capacity, collecting the methane produced using the gas collection and delivery system, monitoring the collected methane, and upon determining that the production of methane from the quantity of municipal solid waste has subsided, promoting aerobic digestion of the quantity of municipal solid waste by providing air to the quantity of municipal solid waste using the gas collection and delivery system. The method further involves monitoring the pH and adjusting the pH as necessary to maintain the pH high enough to promote growth of methanogenic organisms. The pH is maintained between 6.8 and 7.4. The method further involves collecting the methane produced in promoting step which is performed by providing a gas collection and delivery system in operative association with the quantity of municipal solid waste, and the method further involves monitoring the content of the gas collected in the gas collection and delivery system and adjusting the rate of gas collection as necessary to maximize methane collection. The method further involves providing a leachate collection and recirculation system for collecting leachate from the quantity of municipal solid waste and circulating the leachate back to the quantity of municipal solid waste during the promoting step or anaerobic digestion and aerobic digestion. The method involves supplementing the leachate with liquid as necessary to maintain the moisture content of the quantity of municipal solid waste at least a field capacity of the quantity of municipal solid waste. The method further involves a leachate collection and recirculation system for collecting leachate from the quantity of municipal solid waste and recirculating the leachate back to the quantity of municipal solid waste during the step of promoting anaerobic and aerobic digestion, the quantity of municipal solid waste being amended by adding the amendment to the leachate recirculated back to the quantity of municipal solid waste. The method further involves monitoring the temperature of gas exhausted from the quantity of municipal solid waste and maintaining the temperature within select parameters by varying the quantity of air provided. The method is involves supplementing the liquid of the leachate collection and recirculation system (claimed).    ADVANTAGE - (I) provides air space reduction, enhanced biogas production and in situ leachate treatment, and moves waste as quickly as possible, and reclaims the rapid decomposition area for additional waste or other purposes.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a solid waste management system (II) for disposal of solid waste, which involves providing several bioreactor cells, each cell comprising a leachate collection and recirculation system and a gas collection and delivery system, providing a quantity of one of a source separated solid waste and a mixed solid waste to one of the bioreactor cells in operative association with the leachate collection and recirculation system and the gas collection and delivery system, promoting anaerobic digestion in the quantity of municipal solid waste (16) by methanogenic organisms to produce methane, recycling leachate to the quantity of the one of a source separated solid waste and a mixed solid waste using the leachate collection and recirculation system, supplementing the liquid of the leachate collection and recirculation system as necessary to maintain the liquid content of the quantity of municipal solid waste at its field capacity, collecting the methane produced using the gas collection and delivery system, monitoring the collected methane, and upon determining that the production of methane from the quantity of municipal solid waste has subsided, promoting aerobic digestion of the quantity of municipal solid waste by providing air to the quantity of organic waste using the gas collection and delivery system.    DESCRIPTION OF DRAWING(S) - The figure shows    Landfill cell (10)    Lining system (12)    Cover (14)    Municipal solid waste (16)    Collection region (17)    Leachate drainage pipe (22)    Drainage media (24)    Perforated distribution pipes (30)