PRODUCTION OF WOOD BIOMASS FUEL CHIPS This plant takes 22 , 500 tonnes per annum of waste wood such as sawmill waste and thinnings which were previously left toLie in hillside forest areas as well as construction waste etc . , and having them thermal recycled as alternative fuel to coal for cement baking calcination . The volume of coal required can be reduced , allowing better control of CO ² emissionsand as there are no by - products as a result of incineration , it leads to extend the life of the landfill and contribute to the efficient reuse of thinnings in forest . Tsukumi Factory , T Cement Co . , Oita Pref . Process Flow ( ↓ Click on an area of the picture below to see photos . )