Field trial to assess ash leachability and gaseous emissions from boilers firing deinking residue (original) (raw)

Tappi Journal, 1997

Abstract

A field trial was performed to examine the chemistry and leachability of ash and gaseous emissions from boilers burning deinking residue together with natural gas and bark. The results show that, for the boiler firing deinking residue with natural gas, increasing the combustion temperature by increasing the gas flow rate had little effect on NO x emissions and ash chemistry. Fly ash consisted of mostly calcined clay, CaO and TiO 2 . Bottom ash was similar but had higher SiO 2 , Fe 2 O 3 , Na 2 O, K 2 O, and PbO contents than fly ash. Pb likely originated from clay used as a coating material. Hg was enriched in fly ash and particulates, but its concentration was too small to be of concern. The leachability of both bottom ash and fly ash was low, particularly for boilers that burn deinking residue with bark due to the high CaO content. Application: Disposal of ash from boilers burning deinking residue with natural gas, or particularly with bark, should not be a concern because of the low heavy-metal content and the low leachability of the ash.

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