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produce power. The
BIOGAS LEADERS
digester keeps oxygen Countries including Germany

gas out. It works almost and China are leaders in using
biogas as a renewable energy
exactly like Leroy source. In Germany, there are

Mwasaru’s model. But approximately 8,000 plants.
They process animal and
everything happens on
agricultural waste for power.

a larger scale. These plants use gas for heat
and to make natural gas.
TYPES OF Biogas provides 4.6 percent of

DIGESTERS Germany’s electricity. China
uses biogas for 10 percent of

There are many types its total natural gas. In rural
areas, more than 42 million
of anaerobic digesters.
homes with farm animals have
But three of the most backyard anaerobic digesters

common are plug flow that process poop to make
fuel for cooking.
digesters, complete

mix digesters, and

covered lagoons. Plug flow digesters are also called

tubular or balloon digesters. These long, narrow tanks

are often below ground. They have an opening on

each end. Waste enters one end. As more waste is

added, it pushes its way down the tank. Most have a

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ABD_UNCO_POOP_FPGS.indd 21 2/22/19 9:22 AM