CONVERTING GARBAGE INTO ENERGY
On December 2, Karnataka Chief Minister B.S. Yedurappa laid the foundation stone
for a 11.5 MW waste to energy plant near Bidadi.
This plant
is expected to process 600 tonnes
per day of inorganic waste.
. Bengaluru generates close to 5,000 tonnes of
waste daily, of which about 2,500
tonnes is organic, about 1,000
tonnes inert material (sweeping
waste) and 1,500 tonnes inorganic
This inorganic material, which consists of bad quality plastics and used
cloth pieces, can be processed as Refuse Derived Fuel (RDF)
. This material has a calorific value of more than
2,500 kJ/kg, and can be used to generate steam energy, which can be
converted into electric energy instead of burning coal and other materials used in traditional waste to energy plants.
WELL PLANNED PLANTS IN INDIA
The waste to energy plants usually
accept the RDF material generated in
organic composting plants.
They also
segregate(seprate) the wet and inorganic material near the plant, convert organic
waste to compost, and inorganic
waste to energy.
About 50 Tonnes of RDF generate 1 MW of power, which indicates that the plant at
Bidadi has been appropriately designed.
. Eight organic waste processing plants are operational within the
city in Kannahalli, Seegehalli, Chikka
Nagamangala, Doddabidarakallu,
KCDC, MSGP, Lingadeeranahalli and
Subbarayanapalya, they receive
more than 2,000 tonnes of waste collected by households, commercial
establishments and markets.
Although about 30%40% of the material
received is segregated organic waste
and the remainder is mixed waste,
the latter consists of about 40% inorganic waste which can be converted
into RDF.
Handling inorganic waste that is
not fit for recycling has always been a
challenge.
At present, these highcalorific materials are landfilled or left
unhandled in waste plants and cause
fire accidents.
Attempts to send this
material to cement kilns have not
fructified.
The proposed plant can
source 600 tonnes per day of this
RDF and generate 11.5 MW of power
equivalent to 2.4 lakh units of power
per day.
This will reduce the city’s dependency on unscientific landfills,
reduce fire accidents, and provide a
permanent solution to recover value
from inorganic waste.

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