66.19% in Beijing and 71.14% in Shanghai. This high proportion of
kitchen waste causes several problems. First, it is suggested that
for incineration, the lower heating value must on average be at
least 7000 kJ/kg, and not fall below 6000 kJ/kg. This temperature
is required since the low heating value of MSW will affect the efficiency
of incineration, especially for power generation (Zerbock,
2003). However, because of the characteristics of kitchen waste,
the average net heating value in the eight cities is rather low,
approximately 1000–1200 kcal (around 4184–5020 kJ). This is a
much lower temperature than needed for effective incineration
and heat utilization. Second, the techniques for recycling kitchen
waste are in the initial stages, and some of the existing kitchen
waste composting projects do not achieve expectations. Third,
reviewing the current conditions of the eight cities, an integrated
sustainable waste management system from generation to final
treatment is still unavailable and the problems of mixed collection
and mixed transportation have not been solved. A key solution to
these problems is to sort kitchen waste at the source. Although
kitchen waste is separated at the source in some major cities and
is actually treated by landfills and incineration factories along with
other categories of wastes. Controversy regarding kitchen waste
separation exists among individual cities and therefore no active
practice is implemented at this time.
66.19% in Beijing and 71.14% in Shanghai. This high proportion of
kitchen waste causes several problems. First, it is suggested that
for incineration, the lower heating value must on average be at
least 7000 kJ/kg, and not fall below 6000 kJ/kg. This temperature
is required since the low heating value of MSW will affect the efficiency
of incineration, especially for power generation (Zerbock,
2003). However, because of the characteristics of kitchen waste,
the average net heating value in the eight cities is rather low,
approximately 1000–1200 kcal (around 4184–5020 kJ). This is a
much lower temperature than needed for effective incineration
and heat utilization. Second, the techniques for recycling kitchen
waste are in the initial stages, and some of the existing kitchen
waste composting projects do not achieve expectations. Third,
reviewing the current conditions of the eight cities, an integrated
sustainable waste management system from generation to final
treatment is still unavailable and the problems of mixed collection
and mixed transportation have not been solved. A key solution to
these problems is to sort kitchen waste at the source. Although
kitchen waste is separated at the source in some major cities and
is actually treated by landfills and incineration factories along with
other categories of wastes. Controversy regarding kitchen waste
separation exists among individual cities and therefore no active
practice is implemented at this time.
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