A bioreactor landfill operates to rapidly transform and degrade organic waste. The increase in waste degradation and stabilization is accomplished through the addition of liquid and air to enhance microbial processes. This bioreactor concept differs from the traditional "dry tomb" municipal landfill approach.

A bioreactor landfill is not just a single design and will correspond to the operational process invoked. There are three different general types of bioreactor landfill configurations:

Aerobic - In an aerobic bioreactor landfill, leachate is removed from the bottom layer, piped to liquids storage tanks, and re-circulated into the landfill in a controlled manner. Air is injected into the waste mass, using vertical or horizontal wells, to promote aerobic activity and accelerate waste stabilization.
Anaerobic - In an anaerobic bioreactor landfill, moisture is added to the waste mass in the form of re-circulated leachate and other sources to obtain optimal moisture levels. Biodegradation occurs in the absence of oxygen (anaerobically) and due to this primarily methane, can be captured to minimize greenhouse gas emissions and for energy projects.
Hybrid (Aerobic-Anaerobic) - The hybrid bioreactor landfill accelerates waste degradation by employing a sequential aerobic-anaerobic treatment to rapidly degrade organics in the upper sections of the landfill and collect gas from lower sections. Operation as a hybrid results in the earlier onset of methanogenesis compared to aerobic landfill

The Solid Waste Association of North America (SWANA) has defined a bioreactor landfill as "any permitted Subtitle D landfill or landfill cell where liquid or air is injected in a controlled fashion into the waste mass in order to accelerate or enhance biostabilization of the waste." 

Researches/ Papers:

• BIOREACTOR LANDFILLS A VIABLE TECHNOLOGY.pdf
• Bioreactor Landfill for Sustainable Solid Waste Landfill Management
• Comparison of aerobic and anaerobic degradation of MSW in bioreactor landfills
• A_Guide_For_Bioreactor_Landfill_Operation
• bio_reactor_landfill
• Reducing potential for climate effects of non CO2 greenhouse gases, methane emission from energy and waste & Anaerobic and aerobic bioreactor Landfills
• library/2003/tech-options/tech-options-4-1-1.pdf
  Controlled Bioreactor Landfill program at Yolo County Central Landfill
• Full scale bioreactor – Bioreactor Projects Publications and Presentations, yolo, USA
• Landfill Bioreactor - A biotechnological solution for waste management, Chennai
• The bioreactor Landfill – An innovation in Solid waste management,USA
• In-situ ammonia removal in bioreactor landfill, Orlando, USA
• The anaerobic bioreactor controlled landfill technology for solid waste management and greenhouse gas abatement, CA
• Aerobic v/s Anaerobic Bioreactor Landfill case study : the new river regional landfill - presentation
• Aerobic v/s Anaerobic Bioreactor Landfill case study : the new river regional landfill –Research paper
• Bioreactor Landfill : research and demonstration project – Northern oaks landfill, Harrison, MI Final report
• Bioreactor Landfill by Shanghai University

References:

• What is Bioreactor Landfill?
• Bioreactor Video & Global Information
• Bioreactor Landfill operation : A guide for development, implementation and monitoring
• Florida Bioreactor Landfill Demonstration Project
• Benefits and Issues , Advantages & Disadvantages
• The bioreactor landfill : future of landfill management 
• Current researches and projects under EPA
• History & current status of bioreactor landfill
• Bioreactor design, operation & monitoring

Article:

• The next sustainable revolution in solid waste management: bioreactor landfills
• THE "SUSTAINABLE LANDFILL" BECOMES A REALITY
• Bio-reactor landfill is the solution for solid waste management

Books:

• SWANA STORE : A solid waste manager's guide to Bioreactor Landfills
• Book reference : Moisture Mass balance calculations for bioreactor landfills
• Permeability of Municipal Solid Waste in Bioreactor Landfill with Degradation