Title:
Leaching Characteristic of Wood Pellet Combustion Residues from Different Combustion Equipments
Author(s):
Sano, T., Miura, S., Furusawa, H., Kaneko, S., Yoshida, T., Nomura, T., Ohara, S.
Document(s):
Paper
Abstract:
To evaluate the suitability of ash application to agricultural fields and forest sites, the leaching characteristics of wood pellet ashes were studied for 11 types of ashes originating from the combustion of five types of Japanese wood pellets with two types of combustors (stoves and muffle furnaces). The ash leachate showed high K and Na concentrations and a high pH value, which indicates that the biomass ash acts as a source of base cations, raising the soil pH (an alternative to lime). As for the trace elements, the concentrations of B and Cr were generally higher than the others. Most of chromium in the leachate existed as Cr (VI). Based on a comparison of the element concentration between the stove and muffle furnace ashes originating from the same fuels, contamination in the combustion process was suggested for Cr, Zn and Cu. These results indicate that wood pellet ashes have higher potential as a fertilizer but that some improvement may be necessary for the combustion system to produce more environmentally-friendly ashes.
Keywords:
ashes, heavy metals, recycling, soil fertility, biofuels, wood pellets
Topic:
Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Recycling of conversion residues (session 2)
Event:
19th European Biomass Conference and Exhibition
Session:
VP2.8.2
Pages:
1836 - 1840
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-VP2.8.2
Price:
FREE
