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Cape biogas-to-electricity project up and running
Engineering News online, 2 November 2007

"South Africa's first independent power plant, a 4.2-MW
biogas-to-electricity plant funded by carbon credits generated under the
Clean Development Mechanism (CDM) of the Kyoto Protocol, was launched at
the State-owned PetroSA's gas-to-liquids refinery near Mossel Bay, in
October.

PetroSA has operated a gas-to-liquids plant at Duinzicht, about 12 km
from Mossel Bay, since 1987. The production process at Duinzicht leads
to waste process water that has been dealt with by way of anaerobic
digestion. The anaerobic digestion is continuous and is a critical
process for the operation of the PetroSA plant, and biogas is naturally
generated in the anaerobic digestion process.

The plant is equipped with a smokestack that houses a flaring apparatus,
whereby biogas has traditionally been flared. It is estimated that the
equivalent of at least 1 300 GWh of gross heat value has been wasted in
this manner over the lifetime of the plant.

The present project uses the waste gas usually flared to generate
electricity to be used on-site by PetroSA. This means the corporation
will need to buy less electricity from the national grid.

The environmental benefits of the project will be less greenhouse-gas
emissions by the national grid, and the more efficient use of energy and
resources in the country."

http://www.engineeringnews.co.za/article.php?a_id=119702

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