Landfill
Gas (LFG) is obtained as a byproduct of microbiological decomposition
of land-filled garbage. Bugs present inside the earth’s crust turns
complex organic compounds into carbon dioxide, methane and smaller
traces of other compounds. LFG majorly contains 40%-45% carbon
dioxide (CO2) and 50%-55% methane (CH4). The balance is made up of
hundreds of other compounds such as oxygen and nitrogen. About 0.2%
to 0.5% of LFG is composed of complex organic compounds that were
never degraded by the bugs. A small % of LFG is composed hydrogen
sulfide and other sulfur compounds. The remaining compounds in the
gas could be just about anything, depending on the garbage and
profile the climate. The exact composition of landfill gas is
different to each and every location.
Landfill
gases can be used in power generation as well as pipeline grade gas.
As the demand for energy is continuously increasing, hence landfill
gases plays a vital role in fulfilling the energy demand and supply
gap. Landfill gas is generally generated through the degradation of
solid waste generally from municipal through micro organisms.
The
landfill gas market can be segmented on the basis of the end user
applications. Landfill gases can be directly used in boilers dryers &
process heaters, infrared heaters, leachate evaporation, pipeline
quality gas and electricity generation. The quality of the gas
depends upon the waste composition, temperature, oxygen, physical
geometry and the time duration of waste disposal. Landfill gas is
directly linked to boilers and other furnaces where it is used in the
same manner as natural gas. It is also used to heat the infrared
heaters and provide power to energy intensive processes.
Landfill
gas can also be transformed into high calorific gas by reducing
oxygen, carbon dioxide and nitrogen content. These gases can be
further utilized in industrial and commercial activities. Most common
methods for the extraction of carbon dioxide are molecular sieve,
amine scrubbing and membrane separation. Nitrogen and oxygen are
controlled by operation and proper design of the landfill.
Electricity can be generated through the use of steam turbines, fuel
cells and micro turbines. Landfill gas can be used for power
generation in industrial as well as commercial level depending upon
the quantity available. Internal combustion engines use maximum
landfill gas because of low cost and high efficiency. An electrical
efficiency of up to 42% to 90% can be easily achieved in case of
combined heat and power.
The
reduction in the energy cost and emission of greenhouse gases are
some of the major drivers for the landfill gas market. Moisture
essential for bacterial survival used in the decomposition of wastes
to generate gases is the major constraint for the market. All the
biological processes associated with the biological decomposition
gets retarded with the drop in moisture level. The increasing share
of landfill gas in power generation and availability of municipal
wastes in abundance brings new opportunities for the market players
to invest in this sector as the cost of primary fuel is low as
compared to the conventional fuels used for power generation.
Some
of the key players in the landfill gas market are Geotech, Landfill
Systems Ltd., BioGasclean A/S, Highland Energy (N.S) Inc., PLK
Technologies Inc., International Biofuels Corp and AFCO Energy Inc.
among others.
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