title: Degradation of refuse in hybrid bioreactor landfill.
abstract: OBJECTIVE
  To explore the process of refuse decomposition in hybrid bioreactor landfill.
  
  
  METHODS
  The bioreactor landfill was operated in sequencing of facultative-anaerobic and aerobic conditions with leachate recirculation, pH, COD, and ammonia in the leachate and pH, biodegradable organic matter (BDM), and cation exchange capacity (CEC) in refuse were detected.
  
  
  RESULTS
  CEC increased gradually with the degradation of refuse, which was negatively correlated with BDM. COD and ammonia in the leachate was declined to 399.2 mg L(-1) and 20.6 mg N L(-1), respectively, during the 357-day operation. The respective concentrations of ammonia and COD were below the second and the third levels of current discharge standards in China.
  
  
  CONCLUSIONS
  The refuse is relatively stable at the end of hybrid bioreactor landfill operation. Most of the readily biodegradable organic matter is mineralized in the initial phase of refuse degradation, whereas the hard-biodegradable organic matter is mainly humidified in the maturity phase of refuse degradation.
authors: Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, Zhejiang, China.
authors: Yan
authors: Y
authors: Long
authors: Yu-Yang
authors: YY
authors: Long
authors: Hai-Chun
authors: HC
authors: Liu
authors: Dong-Sheng
authors: DS
authors: Shen
mesh_terms: D000641:Ammonia / Q000032:analysis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002412:Cations; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D012044:Regression Analysis; D013997:Time Factors; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D002412:Cations; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D000641:Ammonia; D008697:Methane; D010100:Oxygen