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Landfill Gas Bio-Reactor System

The landfill gas bio-reactor system is designed to be used as a separation system for the conversion of landfill
gas to energy. The system removes siloxane, hydrogen sulfide and organic chlorinated hydrocarbons from the
gas before it reaches the combustion engine or combustion turbine system. The carbon bed filter utilizes a
system that entraps the unwanted gas contaminates while allowing all but very small percentage <.0003% of the
methane to escape as cleaned fuel.

After the carbon bed entraps the gas contaminates they are further delivered to a water bath area which is used
to remove the gas contaminates from the carbon filter beds. This is a continual carbon bed washing operation,
so future removal of the carbon bed filter is never required and the carbon may be in the active state for up to
twenty years. The wash bath process stage is an area where the gas contaminates are subjected to a very
specific grouped set of microbes to digest contaminates as nutritional food source.

The process gas flow passes from the carbon bed filtration system and emerges as high quality methane gas
free of compromising compounds to the generation system. This cleaned methane fuel is further processed to a
confinement tank to eliminate any excess moisture from the landfill operation that could be detrimental to the
engine or micro turbine combustion process.

Description

The bio-reactor system is fabricated using stainless steel in the areas of direct exposure to the gas
contaminates. The landfill gas enters the first of many granulated carbon chambers where the contaminates are
trapped. The contaminates are trapped, the processed methane gas continues to exit the carbon bed filtration
system. As the purified methane gas vapor leaves the carbon filtration system the vapors flow to a confinement
tank to further collect any moisture not collected by the carbon beds. The confinement tank is equipped with a
purge system to allow continuous operation.

In the second phase of filtration, the carbon bed tower
are washed during the cleaning phase of the cycle. As
the
carbon is washed ongoing contaminates are removed from the carbon bed and processes these
contaminates within the water bath as nutrients to the selected microbes (food source). These microbes
continually digest the contaminates. The only byproduct of the digestion is water and CO2.

The microbial activity creates no sludge and requires no special wastewater treatment. The microbial colony
must be replenished twelve times per year depending on the amount of contaminates in the process stream. The
cost associated with the microbial change out is $150.00 per pound. Typical microbial amounts on a large
system are two pounds. They are in a dry power form and have a shelf life of up to five years. Changing the
microbes requires less than one hour of employee time.

The filtration system requires no down time, other than normal mechanical maintenance on the blower
s and
pumps
. The filtration system operates with a forced draft blower on a variable frequency drive to control and
regulate the process amounts from the collection system. The system requires no fuel and only minimal amount
of electricity.  

From analyses carried out, the system is able to eliminate the siloxane; H2S, SO2 and chloride content by at
least 98%.Guaranteeing a more pure methane combustible gas providing endless benefits to the owner/operator
including reduced maintenance intervals and longer power generating life.

For every emission application the operation parameters are defined including the process temperature,
microbial amount, differential gas pressure between the intake and outlet, and service time for adding the
microbes in order to ensure that the system operates at optimal efficiency. Both the post collection basin as well
as the wash basin is equipped with inspection windows to quickly verify the fluid level and the state of cleanliness.

The blower
system and all other system parameters may be controlled via a programmable logic controller
(PLC), if facility requires a more controlled system. In addition, it is very easy to integrate into the ability to
monitor and modify the operating parameters via Internet.

Conclusion

The carbon bed microbial gas reactor system offers a low maintenance, low cost solution to the removal of gas
contaminates
with superior efficiencies and simple design the system offers years of reliable service at a small
percentage of comparative equipment costs.
Call +1 (918) 708 - 1253
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