With increasing volumes of waste
now being processed to generate
‘renewable energy’ through the AD
process (Anaerobic Digestion), it’s
important for plant operators to
ensure that capacities are maintained
and optimised.

A sophisticated biogas analyser
from Allison Engineerng is capable
of automatically controlling microbiological
desulphurisation, without
any human input, 24/7.

The Awi-Flex multi-function
biogas analyser is supplied with a
small air compressor which regulates
air injection to the digester (above
the sludge level) to between 0.5 to
1% volume and breaks down the
hydrogen sulphide (H2S) to less
harmful elemental sulphur and
water. By accurately measuring the
O2 and H2S in the biogas and using a
combination of PI and fuzzy logic
control, the company says H2S levels
can be reduced by up to 80%.

The analyser is designed to provide
measurement for CH4, CO2, H2S, O2
and H2, with up to 5 measuring
points. It has an integral rugged PC
interface which enables easy access
to recorded data, sensor parameters
and system diagnostics, with 4-20 /
Profibus / Ethernet communications.