Malaysia - SETatWork - Sustainable Energy Technology at Work

incentives from CDM will be 0.5 percent for 10 years of financial
projection. However, with CDM financing, the IRR can be
increased to 25 percent.
A sensitivity analysis is conducted for another two other
calculations i.e. “reduced capital cost by 25 percent” and
“increased value of energy production by 25 percent”. However,
the sensitivity analysis shows that the project IRR in all cases is
unattractive without the extra income from sale of CERs.
5.5.3 Technical details:
Technical
details:
The project will replace the existing open anaerobic systems
(open digester tanks and lagoons) with well-proven closed,
anaerobic contact digesters. This closed anaerobic digester
technology is well-proven globally for managing high organic
waste and commonly referred to as biogas or anaerobic digestion
technologies.
The POME will be distributed into the closed digesters at
appropriately spaced inlets at the bottom and flows to the top in
an upward direction. The upward motion of the POME influent
will improve the mixing in the digesters. The organic matters in
the wastewater are decomposed under anaerobic process. The
decomposition process leads to the formation of biogas
containing CH4 and CO2.
The new anaerobic tank will be build from 10 mm mild steel with
a stainless steel top cover plate. The existing tanks will get a 3
mm steel plate enforcement to prevent leakage and a new
stainless steel cover plate.
In order to prevent gas leakage from the enclosed digester
tanks, an overflow tank will be constructed. The overflow tank is
the device where biogas and anaerobic liquor are separated and
the liquor can be discharged without escaping of the biogas.
While the digested POME is channelled into aerobic ponds for
further treatment, the captured biogas is pumped through a
pipeline delivery system to the boiler for generating steam.
A new biomass boiler delivering 52 t steam/hour is being built to
replace an existing biomass boiler. The new boiler is designed to
fire a mix of biogas, palm kernel shells, mezocarp fibre and
empty fruit bunches. The residence time of the biogas in the
boiler is long compared to a gas engine solution and that will
secure that the methane will be fully oxidised into CO2. The
environmental performance of the new boiler will be better than
the existing boiler and will live up to all environmental
requirements. The boiler will be equipped with an automated
control system to improve performance and secure good
combustion parameters at all times. The existing boiler is
maintained for back up purposes.
There is hardly any energy consumption of the project as it only
includes pumping of the POME (which is also done in the
baseline) and compression of the biogas before its is send to the
boiler. The minimal project energy consumption is supplied from
the biomass fired boiler and has thus no emissions of greenhouse
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