Composting Of Biodegradable Municipal Waste
In Ireland
Author(s)
N. M. Power & J. D. Murphy
Abstract
The implementation of the Landfill Directive (96/31/EC) will lead to a massive
reduction in quantities of Biodegradable Municipal Waste (BMW), which may
be landfilled. In 2016, an estimated 2.6 million tonnes of BMW will require
diversion from landfill in Ireland. Recycling of dry paper, reuse of textiles and
home composting will divert significant quantities of BMW. However, to divert
the quantities required to comply with the Directive a significant proportion of
the Organic Fraction of Municipal Solid Waste (OFMSW) will require treatment
in centralised biological facilities.
A survey was undertaken of composting facilities in Ireland to ascertain
present capacity, present technology employed and types of feedstock
composted. A generic model (consisting of in-vessel composting followed by
aerated static pile composting) was generated from technical, economic and
environmental data obtained from the survey. The generic model is utilized to
ascertain the effect of economies of scale, the effect of gate fees on potential
profit per tonne feedstock and the greenhouse gas contribution of the composting
process. The model was investigated for four scenarios ranging from small
(11ktpa) to very large (220ktpa). The economic analysis indicated that a potential
for profit of €52.5/t-€65.4/t was achievable without sale of compost. The direct
greenhouse gas production equated to 566kgCO2/t. However considering the
\“do-nothing” scenario of landfill, 1,175kgCO2 equiv/t is avoided. Thus 1 tonne of
BMW saves 609kgCO2 equiv.
Keywords: composting, BMW, OFMSW, gate fee, greenhouse-gas analysis.
Keywords
composting, BMW, OFMSW, gate fee, greenhouse-gas analysis.
Related Book
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