From aspects of fuel preparation

burnout property

thermal efficiency

pollutant emission

ash deposition

and corrosion etc.

the co-combustion technology of biomass

such as wastes from agriculture and forestry

sludge from sewer system

etc.with coal has been presented.Co-combustion of these biomasses with coal has high tendency of ash deposition and corrosiveness

but can reduce emission of CO2

SO2

and NOx

having remarkable environmental benefits.