Need for reduction of aerosol emissions from biomass combustion
Several studies have indicated that
the presence of aerosols in the ambient air may contribute to serious effects on
human health (including increased mortality, hospitalization for respiratory and
heart disease, asthma and lung function). For this reason, governments are
tightening limits on aerosol concentrations and immissions.
Solid ash and soot particles, emitted
from biomass combustion installations, are important sources of aerosols. This
is relevant for all biomass combustion systems (both small and large) that are
not equipped with effective filtation devices, such as fabric filters. In many
areas where biomass combustion systems without efficient particle separation
devices are used, aerosol immission limits are strongly exceeded.
With existing technology, the policy
aim to increase the contribution of energy from biomass as a renewable energy
source may conflict with the aim to reduce aerosol emissions to acceptable
levels. Therefore, mitigation of aerosols that result from biomass combustion
deserves increased attention from research organizations, manufacturers of
boilers and particle removal technologies as well as policy makers.
Bioenergy Task 32 advises to support research and development on reduction of
aerosols. Equipment manufacturers need to be encouraged to develop novel, low
cost combustion installations and filtration techniques that result in low
particulate emissions also in small-scale applications. Task 32 will be
instrumental in market introduction of such systems by providing a platform for