One of the largest differences between home composting and
larger scale composting is the lower temperature (Illmer and
Schinner, 1997) and continuous addition of fresh material in home
composting (Preston et al., 1998). In other related studies, home
composting systems have been based on large additions of waste
with a low frequency. As mentioned, the addition of waste was
up to 53 kg per week in a study by Amlinger et al. (2008) and
McKinley and Williams (2007) reported an addition of 16 kg every
fortnight. In both cases the setup is more likely to represent multifamily
home composting than single-family home composting, in
which lower amounts of waste would be added more frequently
(less than 4 kg week1). Large additions of waste entail a high degradation
rate and an equivalent high temperature in the units. In
both of the mentioned cases, the temperatures reached around
50–70 C, which is much higher than we found and what is expected
for normal home composting (a continuous addition of
waste). This means that degradation and factors such as the gaseous
emissions could be different in these different schemes. The
high-load phase in Unit 4 showed that even with a single addition
of up to 25 kg, the temperature did not exceed 30 C, and it was
never more than 10 C higher than the ambient temperature. The
GHG EFs from the high-load phase (three months + tail-emissions)
were significantly higher than those from the composting phase
(12 months), indicating that the emissions (in kg substance
Mg1 ww) increased with increased waste input.
One of the largest differences between home composting and
larger scale composting is the lower temperature (Illmer and
Schinner, 1997) and continuous addition of fresh material in home
composting (Preston et al., 1998). In other related studies, home
composting systems have been based on large additions of waste
with a low frequency. As mentioned, the addition of waste was
up to 53 kg per week in a study by Amlinger et al. (2008) and
McKinley and Williams (2007) reported an addition of 16 kg every
fortnight. In both cases the setup is more likely to represent multifamily
home composting than single-family home composting, in
which lower amounts of waste would be added more frequently
(less than 4 kg week1). Large additions of waste entail a high degradation
rate and an equivalent high temperature in the units. In
both of the mentioned cases, the temperatures reached around
50–70 C, which is much higher than we found and what is expected
for normal home composting (a continuous addition of
waste). This means that degradation and factors such as the gaseous
emissions could be different in these different schemes. The
high-load phase in Unit 4 showed that even with a single addition
of up to 25 kg, the temperature did not exceed 30 C, and it was
never more than 10 C higher than the ambient temperature. The
GHG EFs from the high-load phase (three months + tail-emissions)
were significantly higher than those from the composting phase
(12 months), indicating that the emissions (in kg substance
Mg1 ww) increased with increased waste input.
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