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Wood Ash Database

– Wood for Energy -

Ash preparation

Raw ash

Raw ash gives the largest and most rapid pH increases while pre-treatment of the ash, like self-hardening or granulation, dampens the effect on pH Arvidsson & Lundkvist, 2003Eriksson, 1998a

However, there are a number of problems associated with raw, or ‘loose’, ash. One being the health risks involved in handling ash, as fine airborne particles are harmful to operators. Also, it can be difficult to evenly spread raw ash, which leads to lower efficiency and slower delivery rates from spreaders.Pitman,R.M. 2006. Wood ash use in forestry - a review of the environmental impacts. Forestry, 79, 563-588.