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Ideal Choice for Waste Management

http://www.organic-power.co.uk/why_anaerobic_digestion.aspx


Why Anaerobic Digestion?
There are essentially three main options for dealing with organic wastes:
§  bury it - which means landfilling
§  burn it - which means incineration, gasification or pyrolysis
§  bio-digest it - which means either anaerobic digestion or composting
Technology
Sustainable
Impact on the environment
Energy recovery
Fertiliser output
Water recovery
Heavy metal recovery
Landfill
No
Unsustainable waste of resources
No
Some CH4 to atmosphere, leachate problems
Yes
Partial if landfill gas extracted
No
No fertiliser outputs
No
Lost in leachate
No
Not possible
Composting
No
Energy required
No
Damage to ozone layer, also leachate problems
No
None
Yes
Incomplete pathogen kill
No
Lost to atmosphere
No
Not possible
Incineration
No
Fertiliser loss negates any energy gain
No
Toxic ash
Yes
Some but Energy wasted
Yes
Some P&K output, but N destroyed
No
Burnt off
No
Secondary waste
Pyrolysis
No
Fertiliser loss negates any energy gain
No
Toxic ash, emmissions regulated
Yes
Some but Energy wasted
Yes
Some P&K output, but N destroyed
No
Burnt off
No
Secondary waste
Gasification
No
Fertiliser loss reduces energy gain
Yes
Pollutants locked in slag
Yes
Some but Energy wasted
Yes
Some P&K output, but N destroyed
No
Burnt off
No
Controlled not recovered
Anaerobic digestion
Yes
Carbon neutral
Yes
Total recovery of energy as CH4CO2 & fertiliser
Yes
Maximum overall energy
Yes
Clean NPK fertiliser and trace elements
Yes
100%
Yes
Heavy metals can be recovered from digestate

Anaerobic digestion is the only system for dealing with organic waste which is sustainable, recovers the maximum energy, is a completely closed system with no emissions to air or land, which retains the fertiliser and water content, and facilitates the recovery of heavy metals.

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