Typical wood burned for fuel at pulp and paper mills, and the wood products industry may consist
of saw dust, wood chips, bark, saw mill scraps hard chips rejected from pulping, excess screenings
such as sheaves, primary residuals without mixed secondary residuals, etc. Physical and chemical
properties of wood ash are important in determining their beneficial uses. These properties are
influenced by species of trees, tree growing regions and conditions, method and manner of
combustion including temperature, other fuel used with wood fuel, and method of wood ash
collection. Further quality variation in these properties occur when wood is co-fired with other
supplementary fuels such as coal, coke, gas, ash, etc. and the relative quantity of wood verses such
other fuels. This section deals with the information collected on properties and options for
constructive uses for wood ash.