Before revision: The digestion is continued until the percentage of degradable solids is reduced to between 20% and 10% depending on local conditions Where non sewage waste is being processed, organic waste such as food, cardboard and horticultural waste can be significantly reduced in volume leaving an output that can be used as soil improver or biomass fuel.
After revision: The digestion is continued until the percentage of degradable solids is reduced to between 20% and 10% depending on local conditions Where non-sewage waste is being processed, organic waste such as food, cardboard and horticultural waste can be significantly reduced in volume leaving an output that can be used as soil improver or biomass fuel.