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RECOVERY: DON’T WASTE BARK ASH


March 1, 2000
By Pulp & Paper Canada

VANCOUVER, BC — Fly ash from bark boilers can be converted into fertilizer pellets that are easy to store, handle and spread efficiently. Bark ash fertilizing allows the recycling of vital nutrients …

VANCOUVER, BC — Fly ash from bark boilers can be converted into fertilizer pellets that are easy to store, handle and spread efficiently. Bark ash fertilizing allows the recycling of vital nutrients and in many cases eliminates the costs associated with disposing of ashes in landfills. After combustion, most of the nutrients contained in bark remain in the ash, except for nitrogen. As well as compensating for nutrient losses caused by harvesting, alkaline ash pellets can be used to neutralize soils and release nutrients to facilitate the growth where it has been stagnant. Alkaline pellets can be used to abate the effects of acid rain. The fly ash pelletizing process enables the addition of nutrients such as nitrogen to create custom-made fertilizers for specific soils and timber stands. Tecwill Granulators Oy designs and manufactures turnkey bark ash pelletizing plants with a capacity of four to seven tonnes per hour (t/h). The plant comes in four easy-to-install assembled modules and it designed to be put on a customer-supplied foundation adjacent to an ash silo. The package includes Windows-based computerized process control. It needs one operator per shift. Enocell Oy in Finland currently produces the EcoAsh pellets. Wood ash fertilizing has been carried out extensively in Finland’s forests dating back to 1937.

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