Mining of compost from dumpsites and bioreactor landfills

2007 ◽  
Vol 7 (3/4) ◽  
pp. 317 ◽  
Author(s):  
Kurian Joseph ◽  
S. Esakku ◽  
R. Nagendran
Keyword(s):  
Bioreactor Landfills

Effect of Aeration on Fresh and Aged Municipal Solid Waste in a Simulated Landfill Bioreactor

2004 ◽  
Vol 39 (3) ◽  
pp. 223-229 ◽  
Author(s):  
Mostafa A. Warith ◽  
Graham J. Takata
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Ammonia Concentration ◽  
Air Injection ◽  
Bioreactor Landfills ◽  
Time To Stabilization ◽  
High Ammonia ◽  
Simulated Landfill ◽  
Term Monitoring

Abstract Municipal solid waste (MSW) is slow to stabilize under conventional anaerobic landfill conditions, demanding long-term monitoring and pollution control. Provision of aerobic conditions offers several advantages including accelerated leachate stabilization, increased landfill airspace recovery and a reduction in greenhouse gas emissions. Air injection was applied over 130 days to bench-scale bioreactors containing fresh and aged MSW representative of newly constructed and pre-existing landfill conditions. In the fresh MSW simulation bioreactors, aeration reduced the average time to stabilization of leachate pH by 46 days, TSS by 42 days, TDS by 84 days, BOD5 by 46 days and COD by 32 days. In addition, final leachate concentrations were consistently lower in aerated test cells. There was no indication of a gradual decrease in the concentration of ammonia, and it is likely this high ammonia concentration would continue to be problematic in bioreactor landfill applications. This study focussed only on biodegradability of organics in the solid waste. The concentrations of the nonreactive or conservative substances such as chloride and/or heavy metals remain in the bioreactor landfills due to the continuous recirculation of leachate. The results of this study demonstrate the potential for air injection to accelerate stabilization of municipal solid waste, with greatest influence on fresh waste with a high biodegradable organic fraction.

Achieving “Final Storage Quality” of municipal solid waste in pilot scale bioreactor landfills

2009 ◽  
Vol 29 (1) ◽  
pp. 78-85 ◽  
Author(s):  
R. Valencia ◽  
W. van der Zon ◽  
H. Woelders ◽  
H.J. Lubberding ◽  
H.J. Gijzen
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Pilot Scale ◽  
Bioreactor Landfills ◽  
Storage Quality

scholarly journals Effect of aeration on fresh and aged municipal solid waste

2021 ◽  
Author(s):  
Graham Jon Takata
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Pollution Control ◽  
Bioreactor Landfills ◽  
Anaerobic Conditions ◽  
Waste Stabilization ◽  
Time To Stabilization ◽  
Aerobic Bioreactors ◽  
Term Monitoring

Under the anaerobic conditions of conventional sanitary landfill, entombed municipal solid waste (MSW) is slow to stabilize necessitating long-term monitoring and pollution control. Although anaerobic conditions can provide revenue through energy generation, aerobic stabilization may offer several advantages including reduced fugitive greenhouse gas emissions, accelerated landfill stabilization, and increased landfill airspace recovery. Air injection was applied to bench-scale bioreactor landfills in order to determine the potential for active aeration to accelerate municipal solid waste stabilization and settlement in both new and pre-existing landfills. Fresh and aged wastes were used to represent newly constructed and existing landfill matrices over 130 days. In the fresh MSW bioreactors, aeration reduced the time to stabilization of leachate pH by 44%, TSS by 25%, TDS by 54%, BOD5 by 38% and COD by 59%. Ammonia concentrations stabilized after 129 days of aeration, but remained problematic in the anaerobic bioreactors at the study conclusion. Final leachate concentrations were consistently lower in the aerobic bioreactors than in their anaerobic counterparts. Physical settlement also improved, resulting in a 21.5% recovery of landfill airspace in the aerobic fresh waste bioreactors. Aeration had a similar but reduced influence in the aged waste bioreactors since they were near stabilization at the study inception. The results of this study indicate that aeration significantly accelerates stabilization of MSW with greatest influence on fresh waste with a high biodegradable organic fraction.

scholarly journals Validation of Two-Phase Flow Model for Leachate Recirculation in Bioreactor Landfills

2014 ◽  
Vol 2014 ◽  
pp. 1-24 ◽  
Author(s):  
Krishna R. Reddy ◽  
Rajiv K. Giri ◽  
Hanumanth S. Kulkarni
Keyword(s):  
Rational Design ◽  
Flow Model ◽  
Two Phase Flow ◽  
Field Studies ◽  
Moisture Distribution ◽  
Phase Flow ◽  
Bioreactor Landfills ◽  
Leachate Recirculation ◽  
Lagrangian Analysis ◽  
Two Phase

A numerical two-phase flow model is presented to determine the moisture distribution and pore water and gas pressures within unsaturated municipal solid waste (MSW) in bioreactor landfills during leachate recirculation. The numerical model used is the Fast Lagrangian Analysis of Continua (FLAC), which is based on finite difference approach. The model governing equations and mathematical formulations is briefly explained. Validation of the model is examined by simulating the published laboratory and field studies and published modeling studies. Overall, the two-phase flow model is found to produce results comparable with those of the published studies. This assures that the model can be used for the prediction of moisture distribution and for the rational design of leachate recirculation systems in bioreactor landfills.

Performance of North American Bioreactor Landfills. II: Chemical and Biological Characteristics

2010 ◽  
Vol 136 (8) ◽  
pp. 839-853 ◽  
Author(s):  
Morton A. Barlaz ◽  
Christopher A. Bareither ◽  
Azam Hossain ◽  
Jovita Saquing ◽  
Isabella Mezzari ◽  
...  
Keyword(s):  
North American ◽  
Biological Characteristics ◽  
Bioreactor Landfills
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